Gas nozzle structure with adjustable drift diameter

Abstract

The invention relates to the technical field of gas combustion, and aims to provide a gas nozzle structure with an adjustable drift diameter size. Comprising an inner sleeve and an outer sleeve, wherein the bottoms of the inner sleeve and the outer sleeve are opened; the blocking piece assembly comprises two sets of blocking pieces which are integrally in a Y shape, the blocking pieces are installed on an annular supporting limiting base of the inner sleeve in a limited mode, and after the nozzle cap and the outer sleeve are installed in a threaded connection mode, a limiting ring can be tightly pressed on the supporting limiting base, so that rod pieces of the blocking pieces can only move in the radial direction along open grooves in the supporting limiting base. The blades of the adjacent separation blades are tightly attached to form sealing; when the outer sleeve rotates relative to the inner sleeve, the blocking pieces on the same layer move towards the center so that the ends of the blocking pieces can be in butt joint to form a circular gas channel, or the blocking pieces are retracted under the action of the spring to achieve reverse adjustment of the radial size of the gas channel. By means of the design, centrosymmetric fuel gas jet flow and stable strength can be guaranteed, the combustion efficiency is improved, meanwhile, the operation complexity and the maintenance cost are reduced, and clean combustion can be achieved easily.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas combustion, and particularly relates to a gas nozzle structure with adjustable path size. Background Art

[0002] Under the global trend of addressing climate change and promoting low-carbon transformation, energy conservation and emission reduction of industrial combustion equipment have become the core direction of technological upgrading. The hydrogen-doped natural gas technology can significantly reduce carbon emissions and improve combustion efficiency by mixing hydrogen into natural gas, and has become an important path for the application of clean energy. However, the physical property differences between hydrogen and natural gas result in the dynamic change of the combustion characteristics of the mixed fuel with the hydrogen doping ratio, and it is necessary to adjust the flow rate of the mixed gas to stabilize combustion. When the hydrogen doping ratio is high, a nozzle with a larger path is required, and when the hydrogen doping ratio is low, a nozzle with a smaller path is needed. Existing nozzles are usually of a single path or require replacing the nozzle head to change the path, making it difficult to meet the on-line adjustment needs of fuels that change at any time.

[0003] In the prior art, adjustable-orifice combustion devices are commonly seen, such as an alcohol stove with adjustable flame size, which adjusts the opening size by setting a variable cover plate. However, this variable cover plate using the diaphragm principle usually requires multiple overlapping thin blades to be provided, and there are large gaps between the blades. During use, if the pressure is too high, gas will overflow, resulting in uncontrollable flame shape and combustion state. Therefore, such combustion devices are only suitable for daily life combustion requirements and cannot meet the requirements of industrial combustion equipment when using high-pressure gas.

[0004] Patent publication document CN202733902U discloses an adjustable gas nozzle, which uses a retractable injection needle to change the path size of the injection port so as to adjust the gas output. This solution requires gas to enter from the side of the nozzle, resulting in a large intake resistance; since the injection needle blocks the gas outlet jet, which is not circular but annular, this will inevitably lead to a weakening of the gas jet intensity; moreover, since it is difficult to maintain the concentricity of the injection needle and the gas outlet, it is easy to make the gas jet around the injection needle uneven, resulting in different flow velocities at different positions in the circumferential direction.

[0005] Patent publication CN118703938A discloses an adjustable nozzle cover, nozzle and evaporation crucible, which realizes the controlled displacement of the fan-shaped blades by arranging a plurality of fan-shaped blades whose sides are sequentially fitted between the nozzle cap and the adjustment part, and uses a rotatable adjustment ring and a shaft embedded in the nozzle cap and the adjustment part slide groove, thereby realizing the size change of the central splicing hole. However, the edge of the air outlet formed by splicing a plurality of blade tips of the nozzle is parallel to the axial direction, and local turbulence will be formed when the high-pressure gas flows through, causing the gas in the nozzle to lose a large momentum, affecting the high flow rate of the gas. In addition, when multiple fan-shaped blades are arranged on the same plane, the blades will not always remain in a tightly fitted state during the rotation process, and thus inevitably produce multiple gaps, which makes it impossible to keep the high-pressure gas sealed, causing the flame to spread outward, making the flame shape and combustion state uncontrolled.

[0006] Therefore, the present invention proposes a newly designed gas nozzle structure to solve the above problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a gas nozzle structure with adjustable diameter.

[0008] To solve the technical problem, the solution of the present invention is:

[0009] Provided is a gas nozzle structure with adjustable diameter, comprising a nozzle cap, a stop ring, a baffle assembly, an inner sleeve and an outer sleeve, wherein both the inner sleeve and the outer sleeve are open at the bottom and have a central opening on the upper end surface;

[0010] Two annular support limit seats arranged symmetrically with respect to the center are also provided on the upper end surface of the inner sleeve, and a plurality of radial grooves are provided on the upper surface of each support limit seat in a descending manner; the inner sleeve is nested and installed in the inner cavity of the outer sleeve and can rotate relatively coaxially, and the support limit seat passes through the central opening of the outer sleeve; two groups of side thrust structures arranged symmetrically with respect to the center are provided at the upper end of the outer sleeve, and each group of side thrust structures includes multiple layers of sinking steps, and the side edges of each sinking step are in a smooth transition from an arc-shaped vertical sliding wall to an annular vertical sliding wall;

[0011] The baffle assembly includes two groups of baffles in a Y-shape as a whole, the front end of the baffle is a semicircular blade, a radial rod is connected at the midpoint of the outer edge of the blade, and a spring is mounted on the rod; each group of baffles is stacked from top to bottom, and the semicircular opening size of each upper blade is smaller than the opening of the lower blade; the rods of each layer of baffles are seated in the radial grooves of the support limit seat one by one, and the tail ends of the rods are against the vertical sliding wall of the side thrust structure one by one;

[0012] The limiting ring is installed above the supporting limiting seat, and the bottom surface of the limiting ring has a shape adapted to the upper surface of the supporting limiting seat; the nozzle cap is provided with a central opening, and after being installed with the outer sleeve in a screwed manner, it can press the limiting ring onto the supporting limiting seat, enabling the rods of each baffle to only move radially along the slots on the supporting limiting seat, and making the blades between adjacent baffles fit tightly to form a seal;

[0013] When the outer sleeve rotates relative to the inner sleeve, the vertical sliding wall in its side-pushing structure will push a pair of same-layer baffles towards the center, and finally make the ends of their blades butt against each other to form a circular gas passage; during the continuous rotation to achieve layer-by-layer docking, the radial dimension of the gas passage gradually decreases from bottom to top; when the outer sleeve rotates in the opposite direction relative to the inner sleeve, each layer of baffles is successively retracted under the action of the spring, realizing the reverse adjustment of the radial dimension of the gas passage.

[0014] As a preferred solution of the present invention, the size of the central opening of the nozzle cap is not less than the radial dimension of the gas passage formed after the docking of the largest-opening blades in the baffle assembly; an internal thread is provided on the circumferential lower edge of the nozzle cap, and an external thread matching it is provided on the upper-end outer edge of the outer sleeve.

[0015] As a preferred solution of the present invention, the upper surfaces of the two supporting limiting seats are provided with a plurality of steps in a layer-by-layer descending manner, and the radial slots are arranged on the steps; two sets of symmetrically arranged layer-by-layer descending steps are opened on the lower surface of the limiting ring, and are matched with the layout of the upper steps of the supporting limiting seat.

[0016] As a preferred solution of the present invention, the bottom opening end of the inner sleeve is provided with a quick-release interface or a threaded interface for connecting an external gas pipeline.

[0017] As a preferred solution of the present invention, the upper end of the outer sleeve has an annular thin wall, and the two sets of side-pushing structures are located inside the annular thin wall; in the side-pushing structure, the arc-shaped vertical sliding wall of the sunken step is connected to the inner side of the annular thin wall at one end and smoothly transitions to the annular vertical sliding wall at the other end; each layer of annular vertical sliding walls is concentrically arranged and gradually retracts towards the annular thin wall from top to bottom.

[0018] As a preferred solution of the present invention, the transverse dimension of the tail end of the rod of the baffle is larger than the diameter of the rod, and the surface of the tail end is in a smooth arc shape; the two ends of the spring respectively abut against the tail end of the rod and the side part of the supporting limiting seat.

[0019] As a preferred solution of the present invention, the lower edge of the blade of each baffle has a circumferential bevel, and the angle between the bevel and its upper surface of each baffle is the same; after the blades of adjacent pairs of baffles are docked at the same time, the two circumferential bevels at the lower edges of their blades are spliced to form a smooth circumferential conical surface.

[0020] As a preferred embodiment of the present invention, the lower edge of the upper end surface of the inner sleeve also has a circumferential inclined section. When all the blades are docked simultaneously, the inclined section of the inner sleeve and the circumferential inclined sections of all the blades are spliced to form a smooth circumferential conical surface.

[0021] As a preferred embodiment of the present invention, a transverse chute is provided on the inner sleeve, and a plurality of screw holes are arranged at intervals in the transverse chute; when the two sleeves rotate relative to each other to form a gas passage after a pair of baffles are docked, a fixing screw is passed through the screw hole on the outer sleeve and installed in a certain screw hole of the inner sleeve to achieve fixation.

[0022] As a preferred embodiment of the present invention, a plurality of marking points are arranged at intervals below the transverse chute, and each marking point corresponds to a screw hole respectively, which is used to mark the relative positions of the two sleeves after different baffles are docked; the lowermost edge of the outer sleeve is located between the transverse chute and the marking points.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The present invention provides a baffle assembly with multiple layers of baffles. Through the coordinated opening and closing of the blades symmetrically arranged in multiple layers, a complete gas passage with gradually changing diameters is formed; thereby avoiding problems such as annular jet or uneven flow velocity distribution caused by needle-type injection devices, ensuring that the gas jet is centrosymmetric and the intensity is stable, and thus improving the combustion efficiency.

[0025] 2. The present invention utilizes the rotatable cooperation between the outer sleeve and the inner sleeve, and the adjustment of multiple-stage through-diameters can be achieved only through simple rotation operations; during the whole process, there is no need to disassemble or replace the nozzle, which greatly reduces the operation complexity and maintenance cost during use.

[0026] 3. The sleeve-type structure of the present invention has an overall airtight performance. Through the design of staggered arrangement and spring-assisted reset between the blades of each layer of baffles, the gaps between adjacent blades can be effectively closed; therefore, the nozzle structure of the present invention has strong airtightness, and the positions of the blades are stable and reliable, which is suitable for combustion work under high pressure.

[0027] 4. The present invention is provided with a transverse chute on the inner sleeve, and a plurality of screw holes for fixation are arranged inside it. The precise adjustment and multi-stage precise positioning can be achieved by cooperating with the fixing screw and the marking points; therefore, the operator can quickly identify and lock the target through-diameter, ensuring the adjustment accuracy and repeatability.

[0028] 5. By flexibly adjusting the size of the through-diameter, the present invention can be adapted to mixed gas with different mixing ratios, thereby optimizing the mixing effect of fuel and air and contributing to achieving clean combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an exploded schematic view of the nozzle structure in the present invention.

[0030] Figure 2 It is a schematic diagram of the outer sleeve structure.

[0031] Figure 3 It is a schematic diagram of the blade and the spring.

[0032] Figure 4 It is a schematic diagram of a single blade structure.

[0033] Figure 5 It is a schematic diagram of the cross-sectional structure of the inner sleeve.

[0034] Figure 6 It is a schematic diagram of the fixed ring structure.

[0035] Figure 7 It is a schematic diagram of the nozzle cap structure.

[0036] Figure 8 It is a schematic diagram of the inner sleeve structure.

[0037] Figure 9 It is a schematic diagram of the fully open blade.

[0038] Figure 10 It is a schematic diagram of the partially closed blade.

[0039] Figure 11 It is a schematic diagram of the fully closed blade.

[0040] Figure 12 It is a schematic diagram when the nozzle has the maximum diameter.

[0041] Figure 13 It is a schematic diagram when the nozzle has the minimum diameter.

[0042] Reference numerals in the figure: 1 - nozzle cap; 2 - limit ring; 3 - retaining piece assembly; 4 - outer sleeve; 5 - inner sleeve; 6 - fixing screw; 7 - connecting thread; 8 - limit ring blocking wall; 9 - auxiliary installation notch; 10 - limit ring step; 11 - spring; 12 - blade; 13 - rod; 14 - rod end; 15 - blade end; 16 - circumferential inclined section; 17 - end protrusion; 18 - end outer edge; 19 - sinking step; 20 - side push structure; 21 - outer sleeve side wall; 22 - screw hole; 23 - annular thin wall; 24 - external thread; 25 - inner sleeve side wall; 26 - transverse chute; 27 - screw hole; 28 - triangular protrusion marking point; 29 - circular protrusion marking point; 30 - radial slot; 31 - supporting limit seat; 32 - auxiliary installation notch; 33 - inner sleeve inclined section; 34 - side wall transition connection surface. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] AsFigure 1 As shown, the gas nozzle structure with adjustable diameter provided by the present invention comprises a nozzle cap 1, a stop ring 2, a baffle assembly 3, an outer sleeve 4 and an inner sleeve 5, both of which are bottom-opening and have a central opening on the upper end surface. Two support and stop seats 31 arranged symmetrically are also provided on the upper end surface of the inner sleeve 5, and a plurality of radial grooves 30 are provided on the upper surface of each support and stop seat 31 in a descending manner; the inner sleeve 5 is nested and installed in the inner cavity of the outer sleeve 4 and can rotate coaxially relative to each other, and the support and stop seat 31 passes through the central opening of the outer sleeve 4. In order to realize the combustion function, a quick-release interface or a threaded interface (not shown in the figure) for connecting to an external gas pipeline is provided at the bottom open end of the inner sleeve 5.

[0045] like Figure 2 As shown, the upper end of the outer sleeve 4 has an annular thin wall 23, and two sets of side thrust structures 20 are arranged symmetrically on the inner side, each of which includes multiple layers of sinking steps 19. The side edge of each sinking step 19 is a smooth transition from an arc-shaped vertical sliding wall to an annular vertical sliding wall. The arc-shaped vertical sliding wall is connected to the inner side of the annular thin wall 23 at one end, and the other end smoothly transitions to the annular vertical sliding wall; each layer of annular vertical sliding wall is concentrically arranged and retreats toward the annular thin wall 23 layer by layer from top to bottom. In the same layer of steps, the radial size of the arc-shaped vertical sliding wall gradually decreases as a pushing section, and the radius of the annular vertical sliding wall remains unchanged as a moving section. The radial distance of the arc-shaped vertical sliding wall corresponds to the moving distance required by the corresponding baffle.

[0046] like Figures 3 - 5 As shown, the baffle assembly 3 includes two groups of baffles in a Y-shape as a whole, the front end of the baffle is a semicircular blade 12, the midpoint of the outer edge of the blade 12 is connected to a radial rod 13, and a spring 11 is mounted on the rod 13; each group of baffles is stacked from top to bottom, and the semicircular opening size of each upper blade 12 is smaller than the opening of the lower blade; the rods 13 of each layer of baffles are seated in the radial slots 30 of the support limit seat 31 one by one, and the tail ends 14 of the rods are against the vertical sliding wall of the side thrust structure 20 one by one. In order to prevent the spring 11 from slipping off, the lateral size of the tail end 14 of the rod is larger than the diameter of the rod 13, and the two ends of the spring 11 are respectively against the tail end 14 of the rod and the side of the support limit seat 31. The surface of the tail end 14 of the rod is in a smooth arc shape to reduce the friction during the sliding process. Since each baffle in the baffle assembly 3 is arranged on the annular support limit seat, and its rod 14 is seated in the radial groove 30, it is ensured that each layer of blades can be arranged at a set appropriate angle, so that after being docked in sequence, the closed gap generated when the next stage of blades are docked can be blocked, thereby enhancing the overall airtightness of the airflow channel.

[0047] The lower edge of the blade 12 of each baffle has an annular beveled surface 16, and the angles between the annular beveled surface 16 of each baffle and its upper surface are the same. After the blades of two adjacent pairs of baffles are docked at the same time, the two annular beveled surfaces 16 at the lower edges of the blades are spliced to form a smooth annular conical surface. Furthermore, the lower edge of the upper end surface of the inner sleeve 5 can also be set to have an annular beveled surface, so that when all the blades 12 are docked at the same time, the beveled surface of the inner sleeve 5 and the beveled surfaces of all the blades can be spliced to form a smooth annular conical surface, thereby avoiding turbulence of high-speed combustion gas when passing through each layer of blades.

[0048] like Figure 6 As shown, the stop ring 2 is used to be installed above the support stop seat 31, and the bottom surface of the stop ring 2 has a shape that matches the upper surface of the support stop seat 31. An internal thread is provided on the lower edge of the ring of the nozzle cap 1, and an external thread 24 that matches the internal thread is provided on the annular thin wall 23 of the outer sleeve. Figure 7 As shown, the upper surfaces of the two support and limit seats 31 are provided with a plurality of steps in a step-by-step descending manner, and radial slots 30 are provided on the steps. Two groups of symmetrically arranged step-by-step descending steps are provided on the lower surface of the limit ring, and are matched with the layout of the steps on the support and limit seats 31. Due to the combination of the limit ring 2 and the support and limit seat 31, sufficient activity space is reserved for the spring 11 of the baffle.

[0049] like Figure 7 As shown, the nozzle cap 1 is provided with a central opening, and after being screwed together with the outer sleeve 4, the limiting ring 2 can be pressed against the supporting limiting seat 31, so that the rod 13 of each baffle can only move radially along the radial slot 30 on the supporting limiting seat 31, and the blades 12 of adjacent baffles are tightly fitted to form a seal. In order to avoid affecting the gas flow, the central opening size of the nozzle cap 1 is not less than the radial size of the gas channel formed after the largest opening blade in the baffle assembly 3 is docked.

[0050] like Figure 8 As shown, a transverse slot 26 is provided on the inner sleeve 5, and a plurality of screw holes 27 are arranged at intervals in the transverse slot 26; when the two sleeves rotate relative to each other so that a pair of baffles are butted together to form a gas passage, a fixing screw 6 is passed through the screw hole 22 on the outer sleeve and then installed in a screw hole 27 of the inner sleeve to achieve fixation. Furthermore, a plurality of marking points are arranged alternately below the transverse slot 26, each of which corresponds to a screw hole 27, for marking the relative positions of the two sleeves after different baffles are butted together; in order to expose the marking point, the bottom edge of the outer sleeve 4 should be located between the transverse slot 26 and the marking point.

[0051] like Figures 9 - 12As shown, when the outer sleeve 4 rotates relative to the inner sleeve 5, the vertical sliding wall in its side-pushing structure 20 will push a pair of same-layer retaining pieces towards the center, and finally make the blade ends 15 butt-joint to form a circular gas passage; during the continuous rotation to achieve layer-by-layer butt-joint, the radial dimension of the gas passage gradually decreases from bottom to top; when the outer sleeve 4 rotates in the opposite direction relative to the inner sleeve 5, each layer of retaining pieces is successively retracted under the action of the spring 11 to achieve the reverse adjustment of the radial dimension of the gas passage.

[0052] All the fittings of the gas nozzle structure in the present invention are made of stainless steel materials or other alloy materials with high temperature resistance, corrosion resistance and high strength. Among them, each component in the nozzle cap 1, the limiting ring 2, the outer sleeve 4 and the inner sleeve 5 can be made into an integral structure by processing techniques such as laser cutting or turning and milling. The retaining pieces and the spring 11 in the retaining piece assembly 3 need to be separately processed and then assembled.

[0053] A specific example:

[0054] In the gas nozzle structure, the retaining piece assembly 3 includes 10 springs and 5 pairs of retaining pieces. Each retaining piece is arranged from bottom to top according to the opening size of the blade 12 from large to small. The included angle between the rods 13 of each adjacent retaining piece is 13°. The radial advancing part of the arc-shaped vertical sliding wall of the sunken step in the side-pushing structure forms an angle of 22° relative to the center of the outer sleeve. The circumferential angle of the transverse chute in the inner sleeve 5 is 120°. Correspondingly, each set of side-pushing structures 20 in the outer sleeve 4 includes 5 layers of sunken steps, and the limiting ring 2 and the supporting and limiting seat 31 are also respectively provided with 5 layers of steps to be suitable for the installation of the retaining piece assembly 3.

[0055] During installation, first put the outer sleeve 4 on the inner sleeve 5, and rotate the hexagonal fixing screw 6 through the screw hole 22 and fix it in the screw hole 27. Then place each retaining piece in the radial slot 30 of the supporting and limiting seat 31 of the retaining piece assembly 3 to ensure that the spring 11 is located between the annular thin wall 23 and the supporting and limiting seat 31. During installation, using the retaining piece above to press the already installed retaining piece below can facilitate the installation. Then fit the limiting ring 2 correspondingly on the supporting and limiting seat 31, and finally fix and tighten the nozzle cover 1 on the upper end of the outer sleeve 4 by threaded connection to achieve the pressing of the limiting ring 2 and the retaining piece assembly 3.

[0056] When adjusting the diameter of the gas nozzle, first unscrew the fixing screw 6 until it disengages from the screw hole 27, then rotate the outer sleeve 4 by an angle of 22°, and then align the fixing screw 6 to the circular indicating protrusion 29 to which it needs to be adjusted, and tighten the fixing screw 6 into the new screw hole 27 to achieve fixation. During this process, the adjustment state in the inner sleeve 5 is as follows: when the two sleeves rotate relative to each other, the arc-shaped vertical sliding wall in the side pushing structure 20 pushes the corresponding rod 13 to move radially, causing the blade 12 to move towards the center. Eventually, the two opposing blades 12 are butted to form a complete closed ring. At this time, the end 14 of the rod is on the annular vertical sliding wall, and the spring 11 is also compressed to the shortest, as Figure 10 shown. In this way, when adjusting to the minimum diameter, each arc-shaped vertical sliding wall gradually pushes the blade 12 towards the center to form the minimum diameter. Except for the top layer, the ends 14 of other rods move circumferentially on the annular vertical sliding wall and no longer move radially, as Figure 11 shown. The state of the gas nozzle adjusted to the minimum diameter is as Figure 13 shown. On the contrary, when reducing the diameter, rotate the outer sleeve 4 in the reverse direction. At this time, the side pushing structure 20 will no longer support the blade 13 of the retaining piece at the central position, and the spring 11 will push the end 14 of the rod to move the retaining piece radially outward until it returns to the outermost side, thereby achieving the purpose of increasing the diameter.

[0057] The above is only the preferred embodiment of the present invention and does not limit the scope of this patent. It should be noted that for those of ordinary skill in the art, any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A gas nozzle structure with adjustable path diameter size, characterized in that It includes a nozzle cap, a stop ring, a baffle assembly, an inner sleeve and an outer sleeve, wherein both the inner sleeve and the outer sleeve are open at the bottom and have a central opening on the upper end surface; Two annular support limit seats arranged symmetrically with respect to the center are also provided on the upper end surface of the inner sleeve, and a plurality of radial grooves are provided on the upper surface of each support limit seat in a descending manner; the inner sleeve is nested and installed in the inner cavity of the outer sleeve and can rotate relatively coaxially, and the support limit seat passes through the central opening of the outer sleeve; two groups of side thrust structures arranged symmetrically with respect to the center are provided at the upper end of the outer sleeve, and each group of side thrust structures includes multiple layers of sinking steps, and the side edges of each sinking step are in a smooth transition from an arc-shaped vertical sliding wall to an annular vertical sliding wall; The baffle assembly includes two groups of baffles in a Y-shape as a whole, the front end of the baffle is a semicircular blade, a radial rod is connected at the midpoint of the outer edge of the blade, and a spring is mounted on the rod; each group of baffles is stacked from top to bottom, and the semicircular opening size of each upper blade is smaller than the opening of the lower blade; the rods of each layer of baffles are seated in the radial grooves of the support limit seat one by one, and the tail ends of the rods are against the vertical sliding wall of the side thrust structure one by one; The limiting ring is installed above the supporting limiting seat, and the bottom surface of the limiting ring has a shape that matches the upper surface of the supporting limiting seat; the nozzle cap is provided with a central opening, and after being screwed together with the outer sleeve, the limiting ring can be pressed against the supporting limiting seat, so that the rod of each baffle can only move radially along the slot on the supporting limiting seat, and the blades of adjacent baffles are tightly fitted to form a seal; When the outer sleeve rotates relative to the inner sleeve, the vertical sliding wall in its side thrust structure will push a pair of baffles on the same layer to move toward the center, eventually making the ends of their blades dock and forming a circular gas channel; in the process of continuous rotation to achieve layer-by-layer docking, the radial size of the gas channel gradually decreases from bottom to top; when the outer sleeve rotates in the opposite direction relative to the inner sleeve, the baffles on each layer are gradually retracted under the action of the spring, thereby achieving reverse adjustment of the radial size of the gas channel.

2. The gas nozzle structure according to claim 1, wherein The central opening size of the nozzle cap is not less than the radial size of the gas channel formed after the largest opening blade in the baffle assembly is connected; an internal thread is arranged on the lower edge of the ring of the nozzle cap, and an external thread matching with it is arranged on the outer edge of the upper end of the outer sleeve.

3. The gas nozzle structure according to claim 1, wherein, The upper surfaces of the two supporting limit seats are provided with a plurality of steps in a descending manner, and the radial grooves are provided on the steps; the lower surface of the limit ring is provided with two groups of symmetrically arranged steps that descend in layers, and are coordinated with the layout of the steps on the supporting limit seats.

4. The gas nozzle structure according to claim 1, characterized in that, The bottom open end of the inner sleeve is provided with a quick-release interface or a threaded interface for connecting to an external gas pipeline.

5. The gas nozzle structure according to claim 1, characterized in that, The upper end of the outer sleeve is provided with an annular thin wall, and the two sets of side thrust structures are located on the inner side of the annular thin wall; in the side thrust structure, the arc-shaped vertical sliding wall of the sinking step is connected to the inner side of the annular thin wall with one end, and the other end smoothly transitions to the annular vertical sliding wall; each layer of the annular vertical sliding wall is concentrically arranged, and retreats toward the annular thin wall layer by layer from top to bottom.

6. The gas nozzle structure according to claim 1, characterized in that, The transverse dimension of the end of the rod of the baffle is greater than the diameter of the rod, and the surface of the end is a smooth arc shape; the two ends of the spring respectively abut against the end of the rod and the side part of the support limiting seat.

7. The gas nozzle structure according to claim 1, characterized in that, The lower edge of the blade of each baffle has a circumferential inclined section, and the included angle between the inclined section of each baffle and its upper surface is the same; after the blades of adjacent pairs of baffles are butted simultaneously, the two circumferential inclined sections at the lower edge of the blades are spliced to form a smooth circumferential conical surface.

8. The gas nozzle structure according to claim 7, characterized in that, The lower edge of the upper end surface of the inner sleeve also has a circumferential inclined section. When all the blades are butted simultaneously, the inclined section of the inner sleeve and the circumferential inclined sections of all the blades are spliced to form a smooth circumferential conical surface.

9. The gas nozzle structure according to claim 1, characterized in that, A transverse sliding groove is provided on the inner sleeve, and a plurality of screw holes are arranged at intervals in the transverse sliding groove; when the two sleeves rotate relative to each other to butt a pair of baffles to form a gas passage, a fixing screw is passed through the screw hole on the outer sleeve and installed in a certain screw hole of the inner sleeve to achieve fixation.

10. The gas nozzle structure according to claim 9, characterized in that, A plurality of marking points are arranged at intervals below the transverse sliding groove, and each marking point corresponds to a screw hole respectively, which is used to mark the relative positions of the two sleeves after different baffles are butted; the lowermost edge of the outer sleeve is located between the transverse sliding groove and the marking points.

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