Oxygen lance nozzle capable of being replaced quickly

Abstract

The invention relates to the technical field of oxygen lance nozzles, and discloses a quickly replaceable oxygen lance nozzle which comprises a heat-resistant outer pipe, one end of the heat-resistant outer pipe is open, a mounting area is arranged on the inner side of the heat-resistant outer pipe, an inner pipe and an oxygen lance gas conveying pipe are arranged at the axis of the heat-resistant outer pipe, and a cooling area allowing a coolant to flow in is formed between the oxygen lance gas conveying pipe and the inner pipe; a coolant outflow area is formed between the oxygen lance gas delivery pipe and the heat-resistant outer pipe, and a coolant flows into the outflow area through the cooling area and then is discharged out of the heat-resistant outer pipe; the oxygen lance nozzle component abuts against the end of the heat-resisting outer pipe and communicates with the end of the oxygen lance gas conveying pipe, and the elastic abutting component is arranged on the oxygen lance nozzle component and located in the cooling area and enables the inner pipe and the oxygen lance nozzle component to be kept in a tensioned state through the pressure intensity effect generated when the cooling agent flows in. The oxygen lance nozzle capable of being replaced rapidly aims at achieving rapid and reliable connection and disassembly of the oxygen lance nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen lance nozzles, in particular to a quickly replaceable oxygen lance nozzle. Background Art

[0002] The oxygen lance nozzle is a key component in the converter steelmaking process. It is usually made of high-temperature and erosion-resistant metal materials (such as copper or copper alloy). Its structural design directly affects the efficiency and quality of steelmaking. Multiple nozzles are installed at the front end of the nozzle. By precisely controlling the injection angle, speed and flow rate of oxygen, high-pressure oxygen is blown into the molten pool in a reasonable stream form, triggering a violent oxidation reaction to achieve the purposes of decarburization, heating and impurity removal.

[0003] The oxygen lance gas pipe and the oxygen lance nozzle mostly rely on threaded connection to achieve stable assembly. Although this connection method has a certain initial tightness, the oxygen lance nozzle needs to be connected to high-pressure oxygen and high-pressure cooling water at the same time when working to meet the oxidation reaction needs and its own cooling protection requirements in the steelmaking process. However, the continuous water pressure shock generated by the high-pressure cooling water has become the main destructive factor of the existing connection structure. Under the repeated action of the cooling water pressure, the oxygen lance gas pipe and the oxygen lance nozzle are very likely to loosen. In order to ensure the sealing of the connection, a large torque is often required during installation. This not only increases the difficulty and time cost of assembly, but also makes the disassembly of the oxygen lance nozzle extremely cumbersome in the subsequent equipment maintenance stage. Maintenance personnel need to spend a lot of energy and time on disassembly, which greatly affects the equipment maintenance efficiency. Summary of the Invention

[0004] The purpose of the present invention is to realize the rapid and reliable connection and disassembly of the oxygen lance nozzle, and a quick-replacement oxygen lance nozzle is proposed.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A quick-change oxygen lance nozzle, comprising: A heat-resistant outer tube, one end of which is open and has an installation area on the inner side. An inner tube and an oxygen lance gas pipe are provided at the axis of the heat-resistant outer tube. A cooling area for coolant to flow in is formed between the oxygen lance gas pipe and the inner tube. A coolant outflow area is formed between the oxygen lance gas pipe and the heat-resistant outer tube. The coolant flows into the outflow area through the cooling area and then exits the heat-resistant outer tube. An oxygen lance nozzle component abuts against the end of the heat-resistant outer tube and is connected to the end of the oxygen lance gas transmission pipe; The elastic pressing member is provided on the oxygen lance nozzle member and is located in the cooling area. The elastic pressing member uses the pressure of the coolant flowing in to keep the inner tube and the oxygen lance nozzle member in a tensioned state. The axial limiting component is provided on the oxygen lance nozzle component and uses the buoyancy generated when the coolant flows into and out of the area to limit the axial relative displacement between the oxygen lance nozzle component and the heat-resistant outer tube.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, an inflow pipe connected to the cooling area is provided on the outer wall of the heat-resistant outer tube, and an outflow pipe connected to the outflow area is also provided on the outer wall of the heat-resistant outer tube. The coolant is injected into the cooling area through the inflow pipe, and the coolant in the outflow area is discharged to the outside of the heat-resistant outer tube through the outflow pipe.

[0008] Furthermore, the oxygen lance nozzle component includes: The nozzle outer shell is abutted against the end of the heat-resistant outer tube, and an oxygen nozzle is provided at the end away from the heat-resistant outer tube; An oxygen delivery assembly includes a nozzle interference-fitted to the oxygen nozzle, an oxygen connecting pipe connected to one end of the nozzle, the oxygen connecting pipe being connected to the oxygen lance gas pipe, and the oxygen lance gas pipe, the oxygen connecting pipe and the nozzle together forming an oxygen delivery channel; The cooling guide tube is fixedly installed on the outside of the nozzle and is located between the oxygen connecting tube and the outer shell of the nozzle. One end of the cooling guide tube is in contact with the inner tube and the other end is closed. A guide hole is opened at the axis to guide the coolant from the coolant gap through the guide hole into the coolant outflow area.

[0009] Furthermore, the oxygen lance gas delivery pipe and the nozzle connection end of the inner tube are both provided with an annular sealing groove extending radially inward, and an elastic sealing element is fixed in the annular sealing groove. When the oxygen lance nozzle component and the heat-resistant outer tube abut each other, the insertion ends of the oxygen connecting pipe and the cooling guide pipe of the oxygen lance nozzle component are respectively inserted into the corresponding annular sealing grooves and squeeze the elastic sealing element to form a fluid sealing structure.

[0010] Furthermore, a circumferentially extending annular positioning portion is fixedly installed on the inner wall of the heat-resistant outer tube, and an externally threaded connecting ring is fixedly provided on the end face of the annular positioning portion facing the oxygen lance nozzle component, and an annular assembly gap is formed between the externally threaded connecting ring and the inner wall of the heat-resistant outer tube. The annular positioning portion is also provided with an elastic sealing member located in the annular assembly gap, and the inner wall of the nozzle outer shell is provided with a circumferentially extending internally threaded connecting ring, and the internally threaded connecting ring and the externally threaded connecting ring are connected by threaded fitting, so that the nozzle outer shell and the heat-resistant outer tube form a detachable sealing connection pre-alignment structure.

[0011] Furthermore, the elastic pressing member includes: Connecting seats are evenly distributed along the circumference of the inner wall of the cooling guide tube, and the number of the connecting seats is not less than two, and the connecting seats and the cooling guide tube are fixedly connected to each other; a pressure drive unit, arranged in one-to-one correspondence with the connecting seat, the pressure drive unit comprising a piston cylinder fixed to the connecting seat and an elastic tensioning element capable of axial movement, the side wall of the piston cylinder being provided with a fluid introduction hole; An axial limiting structure is provided on the inner side wall of the inner tube. When the coolant enters the piston cylinder through the fluid inlet hole, the elastic tensioning element is driven to form an axial constraint connection with the axial limiting structure to maintain the sealing and fitting state between the inner tube and the cooling guide tube.

[0012] Furthermore, the elastic tensioning element includes: an elastic return member, disposed in the piston cylinder, one end of which is fixedly connected to the inner wall of the piston cylinder; a sealing sliding member, fixedly connected to the other end of the elastic return member, wherein the outer peripheral wall of the sealing sliding member is in sealing and sliding cooperation with the inner wall of the piston cylinder; a transmission rod, one end of which is fixedly connected to the sealing sliding member, and the other end of which passes through the end wall of the piston cylinder and extends to the outside; The connecting abutment portion is fixedly mounted on one end portion of the transmission rod outside the piston cylinder, and forms a separable constrained connection with the axial limiting structure.

[0013] Furthermore, the axial limiting structure includes: A circumferentially rotating ring, which forms a rotational fit with the inner wall of the inner tube and is capable of circumferentially rotating around the axis of the inner tube; The limiting fitting part is fixedly installed on the circumferential rotating ring, and its number and distribution position match the transmission rod and the connecting abutment part. The limiting fitting part is also provided with a matching groove. When the sealing sliding part moves axially under the action of fluid pressure, the connecting abutment part and the limiting fitting part form an axial limiting abutment relationship, and at the same time, the transmission rod is positioned in the matching groove.

[0014] Furthermore, the axial limiting assembly includes: Guide rings are evenly distributed along the circumference of the inner wall of the nozzle outer shell, with a number of not less than two, and the guide rings are fixedly connected to the nozzle outer shell; The buoyancy rod forms a sliding fit with the guide ring. Under the action of the buoyancy of the coolant, it moves axially and is inserted between the external threaded connecting ring and the internal threaded connecting ring to limit the axial relative displacement of the nozzle outer shell and the heat-resistant outer tube.

[0015] Furthermore, the buoyancy rod includes: A guide sliding rod, forming a sliding fit with the guide ring; a buoyancy driving portion, fixedly mounted on the outer side of the guide sliding rod, and driving the guide sliding rod to move axially under the action of the buoyancy of the coolant; Annular limiting grooves are correspondingly provided on the opposite end surfaces of the external thread connecting ring and the internal thread connecting ring. When the nozzle outer shell and the heat-resistant outer tube are assembled, the limiting grooves are docked to form a limiting channel that is compatible with the guide sliding rod.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The present invention forms a cooling structure for the coolant inflow and outflow areas by arranging a heat-resistant outer tube, an inner tube and an oxygen lance gas pipe, which can more efficiently take away the heat generated by the oxygen lance nozzle when it is working, improve the cooling effect, reduce the risk of component damage due to high temperature, and extend the service life of the oxygen lance nozzle. Secondly, the elastic tightening component uses the pressure effect when the coolant flows in to keep the inner tube and the oxygen lance nozzle component in a taut state, changing the traditional threaded connection method that relies on torque to ensure sealing. There is no need to apply large torque during assembly, which greatly reduces the difficulty and time cost of assembly. At the same time, under the continuous action of the coolant pressure, this This tightening state can effectively prevent the connection from loosening. Compared with the traditional threaded connection that is easy to loosen due to the impact of high-pressure cooling water, it significantly improves the stability and sealing of the connection. Furthermore, the axial limit component uses the buoyancy generated by the coolant in the inflow and outflow areas to limit the axial relative displacement of the oxygen lance nozzle component and the heat-resistant outer tube, further enhancing the stability of the connection and preventing the oxygen lance nozzle from axially moving due to factors such as water flow impact during operation. The overall method of quick replacement of positioning by first aligning and then injecting coolant is adopted, which solves the problems of difficult assembly, easy loosening, and low maintenance efficiency of the oxygen lance nozzle connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall cross-sectional connection structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the connection structure of some elastic pressing members of the present invention; Figure 4 This is a schematic diagram of the overall connection structure of the present invention; Figure 5 A schematic diagram of the connection structure of another perspective of the present invention; Figure 6 This is a schematic diagram of the connection structure between the inner tube and the annular sealing groove of the present invention; Figure 7 This is a schematic diagram of the connection structure of a portion of the heat-resistant outer tube and a portion of the annular positioning portion of the present invention; Figure 8 This is a schematic diagram of the connection structure between the outer shell of the nozzle and the internal thread connecting ring of the present invention; Figure 9 It is a schematic diagram of the connection structure between the nozzle outer shell and the axial limiting assembly of the present invention.

[0018] Figure: 1, heat-resistant outer tube; 2, inner tube; 3, oxygen lance gas pipe; 4, oxygen lance nozzle component; 41, nozzle outer shell; 42, nozzle; 43, oxygen connecting pipe; 44, cooling guide pipe; 45, guide hole; 5, elastic abutment component; 51, connecting seat; 52, piston cylinder; 53, elastic tensioning element; 531, elastic reset member; 532, sealing sliding member; 533, transmission rod; 534, connecting abutment portion; 54, fluid inlet Hole; 55, axial limiting structure; 551, circumferential rotating ring; 552, limiting fitting portion; 553, fitting groove; 534, connecting abutment portion; 6, axial limiting assembly; 61, guide ring; 62, buoyancy rod; 7, inflow pipe; 8, outflow pipe; 9, annular sealing groove; 10, elastic sealing element; 11, annular positioning portion; 12, external thread connecting ring; 13, elastic sealing member; 14, internal thread connecting ring; 15, limiting groove. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Combine Figures 1-9 As shown, a quick-change oxygen lance nozzle of the present invention comprises: A heat-resistant outer tube 1 is open at one end and has an installation area on the inside. An inner tube 2 and an oxygen lance gas pipe 3 are provided at the axis of the heat-resistant outer tube 1. A cooling area for coolant to flow in is formed between the oxygen lance gas pipe 3 and the inner tube 2. A coolant outflow area is formed between the oxygen lance gas pipe 3 and the heat-resistant outer tube 1. The coolant flows into the outflow area through the cooling area and then discharges from the heat-resistant outer tube 1. The oxygen lance nozzle member 4 abuts against the end of the heat-resistant outer tube 1 and is connected to the end of the oxygen lance gas supply pipe 3; The elastic pressing member 5 is provided on the oxygen lance nozzle member 4 and is located in the cooling area. The elastic pressing member 5 uses the pressure of the coolant flowing in to keep the inner tube 2 and the oxygen lance nozzle member 4 in a tensioned state. The axial limiting assembly 6 is provided on the oxygen lance nozzle component 4 , and utilizes the buoyancy generated when the coolant flows into and out of the region to limit the axial relative displacement between the oxygen lance nozzle component 4 and the heat-resistant outer tube 1 .

[0021] When the quick-change oxygen lance nozzle is working, first align the oxygen lance nozzle component 4 with the end of the heat-resistant outer tube 1 to complete the preliminary assembly, and then inject coolant. The coolant flows into the cooling area between the oxygen lance gas pipe 3 and the inner tube 2. During the flow process, the elastic pressing component 5 in the cooling area is subjected to the coolant pressure, produces elastic deformation and applies tension to the oxygen lance nozzle component 4, so that the inner tube 2 and the oxygen lance nozzle component 4 remain in a tensioned state, ensuring that the two are tightly connected to form a stable internal structure connection. At the same time, the coolant continues to flow and enters the coolant outflow area between the oxygen lance gas pipe 3 and the heat-resistant outer tube 1. When the coolant circulates in the inflow and outflow areas, the buoyancy generated The axial limiting component 6 acts on the oxygen lance nozzle component 4. The axial limiting component 6 uses this buoyancy to limit the axial relative displacement between the oxygen lance nozzle component 4 and the heat-resistant outer tube 1, further enhancing the stability of the connection between the two. During the entire working process, the coolant, on the one hand, takes away the heat generated by the oxygen lance nozzle through circulation to ensure its normal working temperature; on the other hand, through the action of the elastic clamping component 5 and the axial limiting component 6, a stable connection between the oxygen lance nozzle component 4 and the heat-resistant outer tube 1 and the inner tube 2 is achieved, avoiding loose connection due to the impact of high-pressure cooling water, and this method of using coolant to achieve positioning greatly simplifies the assembly and disassembly process and realizes rapid replacement.

[0022] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 、 Figure 4 and Figure 5 As shown, the outer wall of the heat-resistant outer tube 1 is provided with an inflow pipe 7 connected to the cooling area, and the outer wall of the heat-resistant outer tube 1 is also provided with an outflow pipe 8 connected to the outflow area. The coolant is injected into the cooling area through the inflow pipe 7, and the coolant in the outflow area is discharged to the outside of the heat-resistant outer tube 1 through the outflow pipe 8. When using the oxygen lance nozzle, the end of the inflow pipe 7 away from the heat-resistant outer tube 1 is connected to the output end of the cooling system. The high-pressure pure water output by the cooling system is used as the coolant and is injected into the cooling area between the oxygen lance gas pipe 3 and the inner tube 2 in the heat-resistant outer tube 1 through the inflow pipe 7. During the flow of the coolant in the cooling area, it absorbs the heat generated by the operation of the oxygen lance nozzle, performing heat exchange. Subsequently, the coolant that has undergone heat exchange flows into the outflow area between the oxygen lance gas pipe 3 and the heat-resistant outer tube 1, and is discharged to the outside of the heat-resistant outer tube 1 through the outflow pipe 8 connected to the outflow area, and the end of the outflow pipe 8 away from the heat-resistant outer tube 1 is connected to the return end of the cooling system, so that the coolant that has completed heat exchange can return to the cooling system for circulating cooling or treatment, thereby constructing a stable circulation system for the coolant. This not only ensures that the coolant can continuously flow into the cooling area to take away heat and maintain the normal operating temperature of the oxygen lance nozzle, but also provides stable pressure and buoyancy working conditions for the elastic clamping component 5 and the axial limiting component 6, ensuring a firm connection between the oxygen lance nozzle component 4 and the heat-resistant outer tube 1 and the inner tube 2.

[0023] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 、 Figure 2 As shown; the oxygen lance nozzle component 4 includes: The nozzle outer shell 41 is in contact with the end of the heat-resistant outer tube 1 and is provided with an oxygen nozzle at the end away from the heat-resistant outer tube 1; The oxygen delivery assembly includes a nozzle 42 that is interference-fitted to the oxygen nozzle, an oxygen connecting pipe 43 that is connected to one end of the nozzle 42, and the oxygen connecting pipe 43 is connected to the oxygen lance gas supply pipe 3. The oxygen lance gas supply pipe 3, the oxygen connecting pipe 43 and the nozzle 42 together constitute an oxygen delivery channel; The cooling guide pipe 44 is fixedly arranged on the outside of the nozzle 42 and is located between the oxygen connecting pipe 43 and the nozzle outer shell 41. One end of the cooling guide pipe 44 is in abutment with the inner tube 2 and the other end is closed. A guide hole 45 is opened at the axis to guide the coolant from the coolant gap through the guide hole 45 to flow into the coolant outflow area. During the operation of the oxygen gun nozzle component 4, the nozzle outer shell 41 is tightly abutted with the end of the heat-resistant outer tube 1 to form a stable basic connection structure. The oxygen nozzle provided at one end away from the heat-resistant outer tube 1 is the terminal part for high-pressure oxygen to be ejected. In the oxygen delivery assembly, the nozzle 42 is interference fitted in the oxygen nozzle. This assembly method ensures the sealing and stability of the connection between the nozzle 42 and the nozzle outer shell 41 to avoid oxygen leakage; one end of the oxygen connecting pipe 43 is connected to the nozzle 42, and the other end is connected to the oxygen gun gas supply The pipe 3 is connected and together with the oxygen lance gas pipe 3 and the nozzle 42, forms a complete oxygen delivery channel. High-pressure oxygen flows into the oxygen lance gas pipe 3, is transported to the nozzle 42 through the oxygen connecting pipe 43, and is finally ejected from the oxygen nozzle of the nozzle outer shell 41, and blown into the molten pool in a reasonable stream form to induce an oxidation reaction, thereby achieving steelmaking purposes such as decarburization, heating and impurity removal. The cooling guide pipe 44 ensures that the coolant can flow in smoothly, and the other end is closed to prevent the coolant from leaking in an unpredictable path. The guide hole 45 at the axis of the cooling guide pipe 44 guides the coolant in the cooling area, and flows from the coolant gap through the guide hole 45 into the coolant outflow area between the oxygen lance gas pipe 3 and the heat-resistant outer pipe 1, completing the coolant circulation path, so that the coolant can efficiently take away the heat generated by the oxygen lance nozzle and ensure the normal operating temperature of the nozzle.

[0024] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 6As shown; the nozzle connecting ends of the oxygen lance gas pipe 3 and the inner tube 2 are both provided with an annular sealing groove 9 extending radially inward, and an elastic sealing element 10 is fixed in the annular sealing groove 9. When the oxygen lance nozzle component 4 and the heat-resistant outer tube 1 abut against each other, the insertion ends of the oxygen connecting pipe 43 and the cooling guide pipe 44 of the oxygen lance nozzle component 4 are respectively inserted into the corresponding annular sealing groove 9 and squeeze the elastic sealing element 10 to form a fluid sealing structure. During the assembly and operation of the oxygen lance nozzle, the annular sealing groove 9 extending radially inward provided at the nozzle connecting end of the oxygen lance gas pipe 3 and the inner tube 2 provides an installation space for the elastic sealing element 10, and the elastic sealing element 10 is preferably a rubber sealing ring, which has good elasticity and sealing performance. When the oxygen lance nozzle component 4 and the heat-resistant outer tube 1 abut against each other, the oxygen lance nozzle The insertion ends of the oxygen connecting pipe 43 and the cooling guide pipe 44 of the component 4 will be accurately inserted into the annular sealing grooves 9 corresponding to the oxygen lance gas pipe 3 and the inner pipe 2 respectively. As the insertion process proceeds, the insertion ends of the oxygen connecting pipe 43 and the cooling guide pipe 44 will exert an extrusion effect on the elastic sealing element 10 in the annular sealing groove 9. Since the elastic sealing element 10 such as the rubber sealing ring has the characteristic of compressible deformation, after being squeezed, it will fit tightly to the outer wall of the insertion end and the inner wall of the annular sealing groove 9, thereby forming a reliable fluid sealing structure between the oxygen lance gas pipe 3 and the oxygen connecting pipe 43, and between the inner pipe 2 and the cooling guide pipe 44. This structure effectively prevents the leakage of high-pressure oxygen in the oxygen delivery channel, and also prevents the coolant in the cooling area from leaking.

[0025] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 7As shown; the inner wall of the heat-resistant outer tube 1 is fixedly installed with a circumferentially extending annular positioning portion 11, and the end surface of the annular positioning portion 11 facing the oxygen lance nozzle component 4 is fixedly provided with an external threaded connecting ring 12, and an annular assembly gap is formed between the external threaded connecting ring 12 and the inner wall of the heat-resistant outer tube 1. The annular positioning portion 11 is also provided with an elastic sealing member 13 located in the annular assembly gap, and the inner wall of the nozzle outer shell 41 is provided with a circumferentially extending internal threaded connecting ring 14, and the internal threaded connecting ring 14 is connected to the external threaded connecting ring 12 by threaded matching, so that the nozzle outer shell 41 and the heat-resistant outer tube 1 form a detachable sealed connection pre-alignment structure. When the connection operation is performed, the inner wall of the nozzle outer shell 41 The internal threaded connecting ring 14 and the external threaded connecting ring 12 on the annular positioning part 11 are screwed together through threads, and the two are gradually tightened, so that the nozzle outer shell 41 is tightly connected to the heat-resistant outer tube 1. During the threaded screwing process, the elastic seal 13, that is, the rubber sealing ring, located in the annular assembly gap between the external threaded connecting ring 12 and the inner wall of the heat-resistant outer tube 1 will be squeezed by the nozzle outer shell 41 and the heat-resistant outer tube 1, and can tightly fill the tiny gap between the nozzle outer shell 41 and the heat-resistant outer tube 1, thereby forming a reliable sealing structure between the two, effectively preventing external impurities from intruding and internal coolant from leaking, and ensuring that the coolant circulates within the prescribed path.

[0026] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 3 As shown; the elastic pressing member 5 includes: Connecting seats 51 are evenly distributed along the inner wall of the cooling guide tube 44 in a circumferential direction, and there are at least two of them. The connecting seats 51 and the cooling guide tube 44 are fixedly connected to each other; The pressure drive unit is provided in a one-to-one correspondence with the connecting seat 51. The pressure drive unit includes a piston cylinder 52 fixed to the connecting seat 51 and an elastic tensioning element 53 capable of axial movement. The side wall of the piston cylinder 52 is provided with a fluid inlet hole 54; The axial limiting structure 55 is provided on the inner side wall of the inner tube 2. When the coolant enters the piston cylinder 52 through the fluid inlet hole 54, the elastic tensioning element 53 is driven to form an axial constraint connection with the axial limiting structure 55 to maintain the sealing fit between the inner tube 2 and the cooling guide tube 44. The connecting seats 51 are evenly distributed along the circumference of the inner wall of the cooling guide tube 44 and are not less than two in number. They are fixed on the cooling guide tube 44, providing a stable installation foundation for the pressure drive unit. In the pressure drive unit corresponding to the connecting seat 51, the piston cylinder 52 is fixed to the connecting seat 51, and the fluid inlet hole 54 provided on its side wall is for the coolant to enter the piston The channel of the cylinder 52, when the coolant flows through the cooling area, will enter the interior of the piston cylinder 52 through the fluid inlet hole 54, and the pressure of the coolant acts on the elastic tensioning element 53 that can move axially, pushing it to produce axial displacement. The axial limiting structure 55 set on the side wall of the inner tube 2 cooperates with the elastic tensioning element 53. As the elastic tensioning element 53 moves axially driven by the coolant pressure, it forms an axially constrained connection with the axial limiting structure 55, compressing the elastic tension of the elastic tensioning element 53, and pulling the inner tube 2 tightly toward the cooling guide tube 44, so that the inner tube 2 and the cooling guide tube 44 maintain a sealed fit.

[0027] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 3 As shown; the elastic tensioning element 53 comprises: The elastic reset member 531 is provided in the piston cylinder 52, and one end thereof is fixedly connected to the inner wall of the piston cylinder 52; the elastic reset member 531 is preferably a spring The sealing sliding member 532 is fixedly connected to the other end of the elastic return member 531, and the outer peripheral wall of the sealing sliding member 532 is in sealing and sliding cooperation with the inner wall of the piston cylinder 52; A transmission rod 533 , one end of which is fixedly connected to the sealing sliding member 532 , and the other end of which passes through the end wall of the piston cylinder 52 and extends to the outside; The connecting abutment 534 is fixedly mounted on one end portion of the transmission rod 533 outside the piston cylinder 52, and forms a detachable constraint connection with the axial limiting structure 55. When the coolant enters the piston cylinder 52 through the fluid inlet hole 54, the pressure of the coolant acts on the sealing sliding member 532. Since the outer peripheral wall of the sealing sliding member 532 and the inner wall of the piston cylinder 52 are sealed and slidably matched, the pressure can be effectively transmitted. Under the pressure drive, the sealing sliding member 532 overcomes the elastic force of the elastic reset member 531 and moves axially along the inner wall of the piston cylinder 52. The movement of the sealing sliding member 532 drives the transmission rod 533 fixed thereto to move synchronously, thereby driving the fixed member 532 to move synchronously. The connecting abutment 534 installed at its end moves. When the connecting abutment 534 contacts the axial limiting structure 55 on the outer wall of the inner tube 2, it continues to move to form a constrained connection with the axial limiting structure 55, and the inner tube 2 is tightly pulled toward the cooling guide tube 44 to achieve a sealed fit between the two. When the oxygen lance nozzle stops working, the coolant no longer flows into the piston cylinder 52, and the pressure disappears. At this time, the elastic force of the elastic reset member 531 comes into play, pushing the sealing sliding member 532 to move in the opposite direction, driving the transmission rod 533 and the connecting abutment 534 to reset, and the connecting abutment 534 is separated from the constrained connection with the axial limiting structure 55, which is convenient for the disassembly and maintenance of the oxygen lance nozzle.

[0028] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 9 As shown; the axial limiting structure 55 includes: The circumferential rotating ring 551 forms a rotational fit with the inner wall of the inner tube 2 and can rotate circumferentially around the axis of the inner tube 2; The limiting engagement portions 552 are fixedly mounted on the circumferentially rotating ring 551. Their number and distribution match those of the transmission rod 533 and the connecting abutment portions 534. The limiting engagement portions 552 are also provided with engagement grooves 553. When the sealing slider 532 moves axially under the action of fluid pressure, the connecting abutment portions 534 and the limiting engagement portions 552 form an axial limiting abutment relationship. Simultaneously, the transmission rod 533 is positioned within the engagement grooves 553. The circumferentially rotating ring 551 forms a rotational engagement with the inner wall of the inner tube 2, allowing it to rotate freely about the axis of the inner tube 2. This allows the limiting engagement portions 552 fixed thereto to be circumferentially adjusted according to the position of the elastic tensioning element 53, ensuring accurate alignment of the limiting engagement portions 552 with the transmission rod 533 and the connecting abutment portions 534. When coolant enters the piston cylinder 52 through the fluid inlet hole 54, the sealing slider 532 moves axially under the action of the fluid pressure, driving the transmission rod 533 and the connecting abutment portions 534 toward the axial limiting structure 55. Because the number and distribution of the limiting mating portions 552 match the transmission rod 533 and the connecting abutment portion 534, the connecting abutment portion 534 can precisely contact the limiting mating portion 552 and form an axial limiting abutment relationship. At the same time, the transmission rod 533 is positioned within the matching groove 553 defined in the limiting mating portion 552. The matching groove 553 radially constrains the transmission rod 533, preventing it from shaking or deflecting during operation. The rotatable nature of the circumferential rotating ring 551 allows the circumferential rotating ring 551 to automatically adjust the position of the limiting mating portions 552 during the initial assembly phase, even if there is a certain circumferential angular deviation between the inner tube 2 and the cooling guide tube 44. This allows the connecting abutment portion 534 to smoothly dock with the limiting mating portion 552, thereby reducing assembly precision requirements and improving assembly efficiency. When the oxygen lance nozzle is working, the axial limit abutment relationship and the positioning of the transmission rod 533 in the matching groove 553 jointly limit the axial relative displacement of the inner tube 2 and the cooling guide tube 44, ensuring that the two always maintain a sealed fit state. A slide groove is provided on the inner wall of the inner tube 2, and a ball is provided on the circumferential rotating ring 551. The circumferential rotating ring 551 is rotatably connected to the inner side of the inner tube 2 through the ball and the slide groove, and the ball will not fall out of the slide groove.

[0029] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 9 As shown; the axial limiting assembly 6 includes: The guide rings 61 are evenly distributed along the inner wall of the nozzle outer shell 41 in a circumferential direction, and the number of the guide rings 61 is not less than two. The guide rings 61 are fixedly connected to the nozzle outer shell 41; The buoyancy rod 62 forms a sliding fit with the guide ring 61. Under the action of the buoyancy of the coolant, it moves axially and is inserted between the external threaded connecting ring 12 and the internal threaded connecting ring 14 to limit the axial relative displacement of the nozzle outer shell 41 and the heat-resistant outer tube 1. The guide ring 61 provides a precise sliding guide path for the buoyancy rod 62. When the coolant is injected into the cooling area through the inflow pipe 7 and flows through the area between the nozzle outer shell 41 and the heat-resistant outer tube 1, the buoyancy rod 62 is affected by the buoyancy of the coolant and slides upward in the axial direction of the guide ring 61. As the buoyancy rod 62 moves axially, its end portion gradually inserts between the external threaded connecting ring 12 and the internal threaded connecting ring 14. The external threaded connecting ring 12 and the internal threaded connecting ring 14 are threadedly matched to connect the nozzle outer shell 41 and the heat-resistant outer tube 1. The insertion of the buoyancy rod 62 forms a mechanical locking structure, which prevents the relative rotation and axial displacement of the internal threaded connecting ring 14 and the external threaded connecting ring 12, thereby limiting the axial separation trend of the nozzle outer shell 41 and the heat-resistant outer tube 1. When the oxygen lance nozzle stops working and the coolant is discharged, the buoyancy rod 62 slides down along the guide ring 61 due to gravity and resets, releasing the constraints on the internal threaded connecting ring 14 and the external threaded connecting ring 12, so that the nozzle outer shell 41 can rotate freely relative to the heat-resistant outer tube 1, which is convenient for quick disassembly and replacement of the oxygen lance nozzle component 4.

[0030] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 9 As shown; the buoyancy rod 62 includes: The guide sliding rod forms a sliding fit with the guide ring 61; The buoyancy driving part is fixedly mounted on the outer side of the guide sliding rod and drives the guide sliding rod to move axially under the action of the buoyancy of the coolant; The outer surface of the nozzle shell 41 and the heat-resistant outer tube 1 are connected with the inner surface of the nozzle shell 41, and the inner surface of the nozzle shell 41 is connected with the inner surface of the nozzle shell 41. When the nozzle shell 41 and the heat-resistant outer tube 1 are assembled, the limiting grooves 15 are docked to form a limiting channel that matches the guide sliding rod. During the operation of the oxygen gun nozzle, the buoyancy rod 62 is driven by the buoyancy of the coolant to mechanically cooperate with the limiting groove 15 to achieve axial limitation of the nozzle shell 41 and the heat-resistant outer tube 1. When the coolant is injected into the cooling area, the buoyancy driving part of the buoyancy rod 62 is subjected to the upward buoyancy, driving the guide sliding rod that slides with the guide ring 61 to move axially upward. At this time, the outer surface of the nozzle shell 41 and the heat-resistant outer tube 1 are connected with the inner surface of the nozzle shell 41, and the limiting grooves 15 are docked to form a complete limiting channel when the nozzle shell 41 and the heat-resistant outer tube 1 are assembled. As the guide sliding rod continues to rise under the action of buoyancy, its end gradually inserts into the In the limiting channel formed by the docking of the limiting grooves 15, since the shape of the limiting grooves 15 is adapted to the guide sliding rod and is distributed in a ring shape on the end face of the threaded connecting ring, the insertion of the guide sliding rod not only prevents the relative rotation of the external threaded connecting ring 12 and the internal threaded connecting ring 14, but also limits the axial separation trend of the two through mechanical interference. This structural design is particularly critical under the continuous water pressure impact generated by high-pressure cooling water, and effectively prevents the loosening problem caused by vibration and pressure fluctuations in traditional threaded connections. When the oxygen gun nozzle stops working and the coolant is discharged, the buoyancy of the buoyancy drive part disappears, and the guide sliding rod slides down and resets along the guide ring 61 under the action of gravity, disengaging from the limiting channel, and releasing the constraint on the nozzle outer shell 41 and the heat-resistant outer tube 1. At this time, the internal threaded connecting ring 14 can rotate freely relative to the external threaded connecting ring 12, which is convenient for quick disassembly of the oxygen gun nozzle component 4. This structure automatically realizes locking and unlocking by utilizing the buoyancy of the coolant.

[0031] The specific working principle of the quick-replacement oxygen lance nozzle of the present invention is as follows: Preliminary alignment and assembly: Align the end of the nozzle shell 41 of the oxygen lance nozzle component 4 with the open end of the heat-resistant outer tube 1, and preliminarily align the internal threaded connecting ring 14 on the inner wall of the nozzle shell 41 with the external threaded connecting ring 12 on the annular positioning portion 11 on the inner wall of the heat-resistant outer tube 1. Preliminary connection is achieved by screwing the threads together. At this time, the elastic seal 13 is initially pressurized in the annular assembly gap to form a basic seal. At the same time, the insertion ends of the oxygen connecting pipe 43 and the cooling guide pipe 44 of the oxygen lance nozzle component 4 are respectively aligned with the annular sealing grooves 9 at the ends of the oxygen lance gas pipe 3 and the inner tube 2, but are not fully inserted yet, forming a fluid sealing structure to ensure the sealing of the coolant and oxygen channels; Coolant injection and internal tightening: connect the inflow pipe 7 with the output end of the cooling system, connect the outflow pipe 8 with the return end of the cooling system, start the cooling system, and inject high-pressure pure water into the cooling area between the oxygen lance gas pipe 3 and the inner tube 2 through the inflow pipe 7. During the flow of the coolant, it enters the pressure drive unit of the elastic abutting member 5 through the fluid inlet hole 54 on the side wall of the piston cylinder 52. The coolant pressure acts on the sealing sliding member 532 to overcome the elastic force of the elastic reset member 531, driving the transmission rod 533 and the connecting abutment 534 to move axially, so that the connecting abutment 534 is inserted into the limiting matching portion 552 of the axial limiting structure 55 on the outer wall of the inner tube 2, and forms a constrained connection with the matching groove 553, thereby tightly pulling the inner tube 2 and the cooling guide tube 44 together; Buoyancy-driven axial limit: The coolant continues to flow and flows into the outflow area between the oxygen lance gas pipe 3 and the heat-resistant outer tube 1 through the guide hole 45 of the cooling guide tube 44. At this time, the coolant generates buoyancy in the flow, which acts on the buoyancy rod 62 of the axial limit assembly 6. The buoyancy drive unit drives the guide sliding rod to rise axially along the guide ring 61, so that its end is inserted into the limiting channel of the limiting groove 15 formed by the docking of the opposite end faces of the external threaded connecting ring 12 and the internal threaded connecting ring 14. The axial relative displacement between the nozzle outer shell 41 and the heat-resistant outer tube 1 is mechanically locked to prevent the threaded connection from loosening. Working stage: The coolant circulates continuously. On the one hand, it removes the working heat of the oxygen lance nozzle through heat exchange to maintain normal temperature. On the other hand, the continuous coolant pressure ensures that the elastic abutment member 5 remains in a taut state, and the buoyancy maintains the locking state of the axial limit assembly 6. At the same time, high-pressure oxygen is ejected from the oxygen nozzle of the nozzle outer shell 41 through the channel formed by the oxygen lance gas pipe 3, the oxygen connecting pipe 43 and the nozzle 42, and is blown into the molten pool for steelmaking operations. Disassembly and maintenance: Turn off the cooling system and stop the coolant supply. The buoyancy rod 62 slides down and resets along the guide ring 61 due to gravity, disengages from the limiting channel, and releases the lock on the threaded connection; the elastic reset member 531 of the elastic abutting member 5 pushes the sealing sliding member 532 to move in the opposite direction, so that the connecting abutment portion 534 is separated from the axial limiting structure 55, and the tension between the inner tube 2 and the cooling guide tube 44 is released. At this time, the internal threaded connecting ring 14 and the external threaded connecting ring 12 can be easily loosened, and the oxygen lance nozzle member 4 can be quickly disassembled for maintenance or replacement. The entire process does not require the application of traditional large torque, which significantly improves efficiency. Through the above steps, the oxygen lance nozzle uses the pressure and buoyancy of the coolant to achieve automatic tightening and limiting, replacing the cumbersome operation of traditional threaded connection, solving the problems of easy loosening and complex assembly and maintenance, while ensuring the reliability of cooling and oxygen supply.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A quick-change oxygen lance nozzle, characterized in that: include: A heat-resistant outer tube (1) is open at one end and has an installation area on the inner side. An inner tube (2) and an oxygen lance gas pipe (3) are provided at the axis of the heat-resistant outer tube (1). A cooling area for coolant to flow in is formed between the oxygen lance gas pipe (3) and the inner tube (2). A coolant outflow area is formed between the oxygen lance gas pipe (3) and the heat-resistant outer tube (1). The coolant flows into the outflow area through the cooling area and then is discharged from the heat-resistant outer tube (1). An oxygen lance nozzle component (4) abuts against the end of the heat-resistant outer tube (1) and is in communication with the end of the oxygen lance gas delivery pipe (3); An elastic pressing member (5) is provided on the oxygen lance nozzle member (4) and is located in the cooling area, and utilizes the pressure of the coolant flowing in to keep the inner tube (2) and the oxygen lance nozzle member (4) in a tensioned state; An axial limiting assembly (6) is provided on the oxygen lance nozzle component (4) and utilizes the buoyancy generated when the coolant flows into and out of the region to limit the axial relative displacement between the oxygen lance nozzle component (4) and the heat-resistant outer tube (1).

2. The quick-change oxygen lance nozzle according to claim 1, characterized in that: An inflow pipe (7) connected to the cooling area is provided on the outer wall of the heat-resistant outer tube (1), and an outflow pipe (8) connected to the outflow area is also provided on the outer wall of the heat-resistant outer tube (1). The coolant is injected into the cooling area through the inflow pipe (7), and the coolant in the outflow area is discharged to the outside of the heat-resistant outer tube (1) through the outflow pipe (8).

3. The quick-change oxygen lance nozzle according to claim 1, characterized in that: The oxygen lance nozzle component (4) includes: The nozzle outer shell (41) is abutted against the end of the heat-resistant outer tube (1), and an oxygen nozzle is provided at one end thereof away from the heat-resistant outer tube (1); An oxygen delivery assembly comprises a nozzle (42) interference-fitted on the oxygen nozzle, an oxygen connecting pipe (43) connected to one end of the nozzle (42), the oxygen connecting pipe (43) being connected to the oxygen lance gas supply pipe (3), and the oxygen lance gas supply pipe (3), the oxygen connecting pipe (43) and the nozzle (42) together forming an oxygen delivery channel; The cooling guide pipe (44) is fixedly arranged outside the nozzle (42) and located between the oxygen connecting pipe (43) and the nozzle outer shell (41). One end of the cooling guide pipe is in contact with the inner pipe (2) and the other end is closed. A guide hole (45) is opened at the axis to guide the coolant from the coolant gap through the guide hole (45) to flow into the coolant outflow area.

4. The quick-change oxygen lance nozzle according to claim 3, characterized in that: The nozzle connection ends of the oxygen lance gas delivery pipe (3) and the inner tube (2) are both provided with an annular sealing groove (9) extending radially inward, and an elastic sealing element (10) is fixedly provided in the annular sealing groove (9). When the oxygen lance nozzle component (4) and the heat-resistant outer tube (1) abut against each other, the insertion ends of the oxygen connecting pipe (43) and the cooling guide pipe (44) of the oxygen lance nozzle component (4) are respectively inserted into the corresponding annular sealing groove (9) and squeeze the elastic sealing element (10) to form a fluid sealing structure.

5. The quick-change oxygen lance nozzle according to claim 3, characterized in that: The inner wall of the heat-resistant outer tube (1) is fixedly provided with a circumferentially extending annular positioning portion (11), and an externally threaded connecting ring (12) is fixedly provided on the end surface of the annular positioning portion (11) facing the oxygen lance nozzle component (4). An annular assembly gap is formed between the externally threaded connecting ring (12) and the inner wall of the heat-resistant outer tube (1). The annular positioning portion (11) is also provided with an elastic sealing member (13) located in the annular assembly gap. The inner wall of the nozzle outer shell (41) is provided with a circumferentially extending internally threaded connecting ring (14), and the internally threaded connecting ring (14) is connected to the externally threaded connecting ring (12) by threaded fitting, so that the nozzle outer shell (41) and the heat-resistant outer tube (1) form a detachable sealed connection pre-alignment structure.

6. The quick-change oxygen lance nozzle according to claim 3, characterized in that: The elastic pressing member (5) comprises: Connecting seats (51) are evenly distributed along the circumference of the inner wall of the cooling guide tube (44), and the number thereof is not less than two, and the connecting seats (51) and the cooling guide tube (44) are fixedly connected to each other; a pressure drive unit, arranged in one-to-one correspondence with the connecting seat (51), the pressure drive unit comprising a piston cylinder (52) fixed on the connecting seat (51) and an elastic tensioning element (53) capable of axial movement, and a fluid introduction hole (54) is provided on the side wall of the piston cylinder (52); An axial limiting structure (55) is provided on the inner side wall of the inner tube (2). When the coolant enters the piston cylinder (52) through the fluid inlet hole (54), the elastic tensioning element (53) is driven to form an axial constraint connection with the axial limiting structure (55) to maintain a sealed fit between the inner tube (2) and the cooling guide tube (44).

7. The quick-change oxygen lance nozzle according to claim 6, characterized in that: The elastic tensioning element (53) comprises: An elastic return member (531) is disposed in the piston cylinder (52), one end of which is fixedly connected to the inner wall of the piston cylinder (52); A sealing sliding member (532) is fixedly connected to the other end of the elastic reset member (531), and the outer peripheral wall of the sealing sliding member (532) is in sealing and sliding cooperation with the inner wall of the piston cylinder (52); a transmission rod (533), one end of which is fixedly connected to the sealing sliding member (532), and the other end of which passes through the end wall of the piston cylinder (52) and extends to the outside; The connecting abutment portion (534) is fixedly mounted on one end portion of the transmission rod (533) located outside the piston cylinder (52), and forms a separable constrained connection with the axial limiting structure (55).

8. The quick-change oxygen lance nozzle according to claim 7, characterized in that: The axial limiting structure (55) comprises: A circumferentially rotating ring (551) forms a rotational fit with the inner wall of the inner tube (2) and is capable of circumferentially rotating around the axis of the inner tube (2); The limiting fitting portion (552) is fixedly mounted on the circumferential rotating ring (551), and its number and distribution position match the transmission rod (533) and the connecting abutment portion (534). The limiting fitting portion (552) is also provided with a matching groove (553). When the sealing sliding member (532) moves axially under the action of fluid pressure, the connecting abutment portion (534) and the limiting fitting portion (552) form an axial limiting abutment relationship, and at the same time, the transmission rod (533) is positioned in the matching groove (553).

9. The quick-change oxygen lance nozzle according to claim 5, characterized in that: The axial limiting assembly (6) comprises: Guide rings (61) are evenly distributed along the circumference of the inner wall of the nozzle outer shell (41), and the number of the guide rings (61) is not less than two, and the guide rings (61) and the nozzle outer shell (41) are fixedly connected to each other; The buoyancy rod (62) forms a sliding fit with the guide ring (61), and moves axially under the action of the buoyancy of the coolant and is inserted between the external threaded connecting ring (12) and the internal threaded connecting ring (14) to limit the axial relative displacement of the nozzle outer shell (41) and the heat-resistant outer tube (1).

10. The quick-change oxygen lance nozzle according to claim 9, characterized in that: The buoyancy rod (62) comprises: A guide sliding rod, forming a sliding fit with the guide ring (61); a buoyancy driving portion, fixedly mounted on the outer side of the guide sliding rod, and driving the guide sliding rod to move axially under the action of the buoyancy of the coolant; Annularly distributed limiting grooves (15) are correspondingly provided on the opposite end surfaces of the external thread connecting ring (12) and the internal thread connecting ring (14). When the nozzle outer shell (41) and the heat-resistant outer tube (1) are assembled, the limiting grooves (15) are butted together to form a limiting channel that is compatible with the guide sliding rod.

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