Structure for preventing gas leakage from air outlet and air outlet sleeve structure

Abstract

The present invention is a structure for preventing gas leakage from the tuyere and a tuyere sleeve structure. The structure for preventing gas leakage from the tuyere includes a plurality of pressure plates. The pressure plate includes a bent plate portion spanning between the tuyere sleeve and the flange. One end of the bent plate portion is provided with a first top plate portion that can abut against the end surface of the flange, and the other end of the bent plate portion is provided with a second top plate portion that can axially abut against the end surface of the tuyere sleeve. The structure for preventing gas leakage from the tuyere also includes an outer cone surface provided on the outer wall of the tuyere sleeve and an inner cone surface provided on the inner wall of the flange. The outer cone surface can seal against the inner cone surface, and a sealing ring is provided between the outer cone surface and the inner cone surface. The present invention overcomes the problems of complicated manufacturing and installation, easy deformation, and easy occurrence of gas leakage from the tuyere in the prior art. The pressure plate is used to connect the tuyere sleeve and the flange, and the cone surface and the sealing ring are used for sealing. The gas leakage in the tuyere area can be effectively prevented, and the safety of the tuyere area can be ensured. It is an effective means to achieve low consumption and safe production of blast furnaces.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a structure for preventing gas leakage from an air vent and an air vent sleeve structure. Background Art

[0002] During the blast furnace smelting process, hot air enters the furnace through the air supply device and burns at the front end of the tuyere. A large amount of high-temperature coal gas is generated during combustion, and a vortex zone is formed. The high-temperature coal gas can easily penetrate the gap of the refractory material to the tuyere equipment. The traditional tuyere sleeve and flange are connected by bolts. The sleeve and flange need to cooperate to open bolt holes. In order to ensure the reliability of the connection between the two, more bolts need to be set, and the manufacturing and installation are more complicated. The rigidity of the sleeve flange is large, and it is easy to deform during manufacturing and installation. In addition, the two are sealed by metal gaskets. Once the gaskets are aged, it is easy to leak gas. In actual production, this situation has also occurred in many blast furnaces. For safety reasons, the leaked gas is generally ignited on site, but long-term high temperature will affect the strength of the furnace shell and tuyere equipment. Therefore, how to control from the source and avoid gas leakage from the joint surface of the tuyere sleeve and flange to ensure the safe production of the blast furnace is the key.

[0003] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a structure for preventing gas leakage from air vents and an air vent sleeve structure to overcome the defects of the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a structure and a tuyere sleeve structure for preventing gas leakage at the tuyere, so as to overcome the problems in the prior art such as complex manufacturing and installation, easy deformation and easy gas leakage at the tuyere. A pressure plate is used to connect the tuyere sleeve and the flange, and a conical surface and a sealing ring are used for sealing, which can effectively prevent gas leakage in the tuyere area and ensure the safety of the tuyere area. It is an effective means to achieve low consumption and safe production of blast furnaces.

[0005] The objective of the present invention is achieved in this way. A structure for preventing gas leakage from an air outlet is used between an air outlet sleeve and a flange that are stacked inside and outside, and includes a plurality of pressure plates that can axially abut and fix the air outlet sleeve and the flange. The pressure plate includes a bent plate portion spanning between the air outlet sleeve and the flange, one end of the bent plate portion is provided with a first top plate portion that can abut against the end surface of the flange, and the other end of the bent plate portion is provided with a second top plate portion that can axially abut against the end surface of the air outlet sleeve; the structure for preventing gas leakage from an air outlet also includes an outer conical surface provided on the outer wall of the air outlet sleeve and an inner conical surface on the inner wall of the flange, the outer conical surface can seal against the inner conical surface, and a sealing ring is provided between the outer conical surface and the inner conical surface.

[0006] In a preferred embodiment of the present invention, it also includes at least 3 pin wedge plates circumferentially spaced apart on the end face of the flange, the number of the pin wedge plates being the same as the number of the pressure plates; each of the pin wedge plates is provided with a pressure wedge through groove radially extending through the flange, each of the pressure plates passes through each of the pressure wedge through grooves respectively and its bent plate portion is straddled in the pressure wedge through groove, a wedge plate is wedged in each of the pressure wedge through grooves at one end of the bent plate portion away from the flange, and the wedge plate is used to fix and press the pressure plate.

[0007] In a preferred embodiment of the present invention, a length dimension of the first top plate portion of the pressure plate along the axial direction of the flange is smaller than a length dimension of the second top plate portion of the pressure plate along the axial direction of the flange.

[0008] In a preferred embodiment of the present invention, each of the pin wedge plates is arranged in a rectangular plate, one end of each of the pin wedge plates is recessed inwardly with the pressure wedge through groove, and the pressure wedge through groove is arranged in a rectangular notch.

[0009] In a preferred embodiment of the present invention, the number of the pin wedge plates, the pressure plates and the wedge plates are all four, and the pin wedge plates are arranged on the end surface of the flange at even intervals in the circumferential direction.

[0010] The purpose of the present invention can also be achieved in this way. A tuyere sleeve structure includes a small tuyere sleeve, a middle tuyere sleeve and a large tuyere sleeve which are overlapped and arranged in a conical sleeve structure. The sealing sleeve at the large diameter end of the small tuyere sleeve is arranged on the inner side of the small diameter end of the middle tuyere sleeve; the sealing sleeve at the large diameter end of the middle tuyere sleeve is arranged on the inner side of the small diameter end of the large tuyere sleeve; a flange is arranged on the outer wall of the large diameter end of the large tuyere sleeve, and a structure for preventing gas leakage from the tuyere sleeve is arranged between the large tuyere sleeve and the flange.

[0011] In a preferred embodiment of the present invention, the structure for preventing gas leakage from the tuyere includes a plurality of pressure plates that can axially abut against and fix the large tuyere sleeve and the flange, the pressure plate includes a bent plate portion spanning the large tuyere sleeve and the flange, one end of the bent plate portion is provided with a first top plate portion that can abut against the end surface of the flange, and the other end of the bent plate portion is provided with a second top plate portion that can axially abut against the end surface of the large tuyere sleeve; the structure for preventing gas leakage from the tuyere also includes an outer conical surface provided on the outer wall of the large diameter end of the large tuyere sleeve and an inner conical surface on the inner wall of the flange, the outer conical surface can be sealed against the inner conical surface, and a sealing ring is provided between the outer conical surface and the inner conical surface.

[0012] In a preferred embodiment of the present invention, the structure for preventing gas leakage from the air outlet also includes at least three pin wedge plates circumferentially spaced apart on the end face of the flange, and the number of the pin wedge plates is the same as the number of the pressure plates; each of the pin wedge plates is provided with a pressure wedge through groove radially extending through the flange, each of the pressure plates passes through each of the pressure wedge through grooves respectively and its bent plate portion is straddled in the pressure wedge through groove, and a wedge plate is wedged in each of the pressure wedge through grooves at the end of the bent plate portion away from the flange, and the wedge plate is used to fix and press the pressure plate.

[0013] In a preferred embodiment of the present invention, each of the pin wedge plates is arranged in a rectangular plate, one end of each of the pin wedge plates is recessed inwardly with the pressure wedge through groove, and the pressure wedge through groove is arranged in a rectangular notch.

[0014] In a preferred embodiment of the present invention, a sealing ring groove is arranged on the outer conical surface of the large air port sleeve, the sealing ring is clamped in the sealing ring groove, and the radial outer side of the sealing ring is sealed against the inner conical surface of the flange.

[0015] As described above, the structure for preventing gas leakage from the tuyere and the tuyere sleeve structure provided by the present invention have the following beneficial effects:

[0016] The structure for preventing gas leakage from the tuyere of the present invention adopts a pressure plate to connect the tuyere sleeve and the flange, replacing the bolt connection in the prior art. The pressure plate is fixedly pressed against the end surfaces of the tuyere sleeve and the flange to fix the tuyere sleeve. The structure is simple and easy to install. The side wall joint surface of the tuyere sleeve and the flange adopts a conical surface seal to abut against each other, which is tightly matched to seal the joint surface of the tuyere sleeve and the flange, forming a main seal. A sealing ring is arranged between the outer conical surface and the inner conical surface, and the flange and the tuyere sleeve joint surface are sealed by the sealing ring, which supplements the hard contact main seal, seals the gas, and plays the role of the first layer of auxiliary seal. The present invention has a simple structure, can effectively prevent gas leakage in the tuyere area, ensures the safety of the tuyere area, and is an effective means to achieve low consumption and safe production of blast furnaces.

[0017] The tuyere sleeve structure provided by the present invention adopts a structure for preventing tuyere gas leakage, and is welded at the joint between the tuyere sleeve and the flange to play a second layer of auxiliary sealing role, thereby achieving triple sealing between the tuyere sleeve and the flange, increasing the sealing performance, and effectively ensuring the safety of the tuyere area. It is an effective means to achieve low consumption and safety of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0019] Figure 1 : It is a schematic diagram of the structure of the air inlet sleeve of the present invention.

[0020] Figure 2 :for Figure 1 Enlarged view of point I in the middle.

[0021] Figure 3 : is a schematic diagram of the flange structure of the mounting pin wedge plate of the present invention.

[0022] Figure 4 :for Figure 3 Schematic diagram of direction A.

[0023] Figure 5 : is a schematic diagram of the pin wedge plate of the present invention.

[0024] Figure 6 : is a schematic diagram of a pressing plate of the present invention.

[0025] In the figure:

[0026] 100. Structure to prevent gas leakage from tuyere;

[0027] 200. Tuyere sleeve structure

[0028] 1. Small air outlet set;

[0029] 2. Tuyere middle set;

[0030] 3. Large air inlet sleeve; 31. Sealing ring groove;

[0031] 4. Flange;

[0032] 5. Pressing plate; 50. Bend plate portion; 51. First top plate portion; 52. Second top plate portion;

[0033] 6. Pin wedge plate; 61. Press wedge penetration groove;

[0034] 7. Wedge plate;

[0035] 81. outer cone surface; 82. inner cone surface; 83. sealing ring;

[0036] 9. Furnace shell. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0038] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] like Figures 1 to 6 As shown, the present invention provides a structure 100 for preventing gas leakage from a tuyere, which is used between a large tuyere sleeve 3 and a flange 4 that are stacked inside and outside. The large tuyere sleeve 3 is arranged in a conical sleeve, and a flange 4 is sleeved on the outer wall of one end of the large diameter of the large tuyere sleeve 3, and the flange 4 is fixed to the furnace shell 9 of the blast furnace (existing technology);

[0041] The structure 100 for preventing gas leakage from the tuyere includes a plurality of pressure plates 5 that can axially abut against and fix the large tuyere sleeve 3 and the flange 4, the pressure plate 5 includes a bent plate portion 50 spanning between the large tuyere sleeve 3 and the flange 4, one end of the bent plate portion 50 is provided with a first top plate portion 51 that can abut against the end surface of the flange 4, and the other end of the bent plate portion 50 is provided with a second top plate portion 52 that can axially abut against the end surface (the end surface of the large diameter end) of the large tuyere sleeve 3; the structure 100 for preventing gas leakage from the tuyere also includes an outer conical surface 81 provided on the outer wall of the large tuyere sleeve 3 and an inner conical surface 82 on the inner wall of the flange 4, the outer conical surface 81 can seal against the inner conical surface 82, and a sealing ring 83 is provided between the outer conical surface 81 and the inner conical surface 82.

[0042] The structure for preventing gas leakage from the tuyere of the present invention adopts a pressure plate to connect the tuyere sleeve and the flange, replacing the bolt connection in the prior art. The pressure plate is fixedly pressed against the end faces of the tuyere sleeve and the flange to fix the tuyere sleeve. The structure is simple and easy to install. The side wall joint surfaces of the tuyere sleeve and the flange adopt a conical sealing abutment, which fits tightly and seals the joint surface of the tuyere sleeve and the flange to form a main seal. A sealing ring is arranged between the outer conical surface and the inner conical surface, and the joint surface of the flange and the tuyere sleeve is sealed by the sealing ring, which supplements the hard contact main seal, seals the gas, and plays the role of the first layer of auxiliary sealing. The present invention has a simple structure, can effectively prevent gas leakage in the tuyere area, ensures the safety of the tuyere area, and is an effective means to achieve low consumption and safe production of blast furnaces.

[0043] Further, if Figure 1 , Figure 2 , Figure 3 As shown, the structure 100 for preventing gas leakage from the tuyere also includes at least three pin wedge plates 6 arranged at intervals in the circumferential direction on the end surface of the flange 4, and the number of the pin wedge plates 6 is the same as the number of the pressure plates 5; each pin wedge plate 6 is provided with a pressure wedge through groove 61 penetrating along the radial direction of the flange, each pressure plate 5 passes through each pressure wedge through groove 61 and its bent plate portion 50 is arranged across the pressure wedge through groove 61, and a wedge plate 7 is wedge-shaped at one end of the bent plate portion 50 away from the flange 4 in each pressure wedge through groove 61, and the wedge plate 7 is used to fix and press the pressure plate 5, and the wedge plate 7 is arranged in a trapezoidal plate. The pressure plate 5 adopts a wedge plate type fixing and pressing method, which makes the fixing method of the pressure plate 5 more flexible, suitable for pressure plates of various lengths, and has a simple structure and is easy to install and disassemble.

[0044] Further, if Figure 6 As shown, since the large diameter end of the large air outlet sleeve 3 is located in the flange, the axial lengths of the two ends of the pressure plate 5 should be different. In this embodiment, the length dimension of the first top plate portion 51 of the pressure plate 5 along the axial direction of the flange 4 is smaller than the length dimension of the second top plate portion 52 of the pressure plate 5 along the axial direction of the flange 4.

[0045] like Figure 3 , Figure 4 , Figure 5 As shown, in this embodiment, each pin wedge plate 6 is provided in the form of a rectangular plate, and one end of each pin wedge plate 6 is provided with a wedge pressing groove 61 inwardly, and the wedge pressing groove 61 is provided in the form of a rectangular notch. In a specific embodiment of the present invention, the number of the pin wedge plates 6, the pressure plate 5 and the wedge plate 7 is 4, and each pin wedge plate 6 is provided on the end surface of the flange 4 at even intervals in the circumferential direction, and each pin wedge plate 6 is welded and fixed to the end surface of the flange 4, so that the pressure plate 5 is pressed and fixed stably.

[0046] like Figure 1As shown, the present invention also provides a tuyere sleeve structure 200, comprising a small tuyere sleeve 1, a middle tuyere sleeve 2 and a large tuyere sleeve 3 which are stacked inside and outside and are all arranged in a cone sleeve structure, the large diameter end sealing sleeve of the small tuyere sleeve 1 is arranged inside the small diameter end of the middle tuyere sleeve 2; the large diameter end sealing sleeve of the middle tuyere sleeve 2 is arranged inside the small diameter end of the large tuyere sleeve 3; a flange 4 is sleeved on the outer wall of the large diameter end of the large tuyere sleeve 3, and a structure 100 for preventing gas leakage from the tuyere sleeve 3 and the flange 4 is provided between the large tuyere sleeve 3 and the flange 4. The large tuyere sleeve 3 and the flange 4 are both made of cast steel, and can be welded at the joint after installation to play a second layer of auxiliary sealing role, increase the sealing performance, and ensure the safety of the tuyere area.

[0047] Further, if Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the structure 100 for preventing gas leakage from the tuyere includes a plurality of pressure plates 5 that can axially abut against and fix the large tuyere sleeve 3 and the flange 4, the pressure plate 5 includes a bent plate portion 50 spanning between the large tuyere sleeve 3 and the flange 4, one end of the bent plate portion 50 is provided with a first top plate portion 51 that can abut against the end surface of the flange 4, and the other end of the bent plate portion 50 is provided with a second top plate portion 52 that can axially abut against the end surface of the large tuyere sleeve 3; the structure 100 for preventing gas leakage from the tuyere also includes an outer conical surface 81 provided on the outer wall of the large diameter end of the large tuyere sleeve 3 and an inner conical surface 82 on the inner wall of the flange 4, the outer conical surface 81 can seal against the inner conical surface 82, and a sealing ring 83 is provided between the outer conical surface 81 and the inner conical surface 82.

[0048] In this embodiment, if Figure 1 , Figure 2 As shown, a sealing ring groove 31 is arranged on the outer conical surface 81 of the large air outlet sleeve 3, and a sealing ring 83 is clamped in the sealing ring groove 31. The radial outer side of the sealing ring 83 is sealed against the inner conical surface 82 of the flange 4. The sealing ring 83 is resistant to high temperature gas and has a certain elasticity. The sealing ring 83 seals the gas through the joint surface with the flange 4, which complements the traditional single sealing (conical surface abutment) of the hard contact joint surface and plays the role of the first layer of auxiliary sealing.

[0049] Further, if Figure 1 , Figure 2 , Figure 3As shown, the structure 100 for preventing gas leakage from the tuyere also includes at least three pin wedge plates 6 arranged at intervals in the circumferential direction on the end surface of the flange 4, and the number of the pin wedge plates 6 is the same as the number of the pressure plates 5; each pin wedge plate 6 is provided with a pressure wedge through groove 61 penetrating along the radial direction of the flange, each pressure plate 5 passes through each pressure wedge through groove 61 and its bent plate portion 50 is arranged across the pressure wedge through groove 61, and a wedge plate 7 is wedge-shaped at one end of the bent plate portion 50 away from the flange 4 in each pressure wedge through groove 61, and the wedge plate 7 is used to fix and press the pressure plate 5, and the wedge plate 7 is arranged in a trapezoidal plate. The pressure plate 5 adopts a wedge plate type fixing and pressing method, which makes the fixing method of the pressure plate 5 more flexible, suitable for pressure plates of various lengths, and has a simple structure and is easy to install and disassemble.

[0050] The tuyere sleeve structure provided by the present invention adopts a structure for preventing tuyere gas leakage, and is welded at the joint between the tuyere sleeve and the flange to play a second layer of auxiliary sealing role, thereby achieving triple sealing between the tuyere sleeve and the flange, increasing the sealing performance, and effectively ensuring the safety of the tuyere area. It is an effective means to achieve low consumption and safety of the blast furnace.

[0051] When manufacturing the air port sleeve structure 200 of the present invention, an outer conical surface 81 is processed on the outer wall of the large diameter end of the large air port sleeve 3, a sealing ring groove 31 is provided on the outer conical surface 81, and an inner conical surface 82 is processed on the inner wall of the flange 4. After the main body of the flange 4 is manufactured, four pin wedge plates 6 are welded on the end face away from the end of the large air port sleeve, and the pin wedge plates 6 are arranged at a certain angle. The other parts of the air port sleeve structure 200 can be processed according to the existing technology.

[0052] During installation, first install the flange 4 on the furnace shell, weld the outer wall of the flange 4 to the furnace shell 9, install the sealing ring 83 into the sealing ring groove 31 of the tuyere sleeve 3, and then push the tuyere sleeve 3 into the flange 4, requiring the joint surface to be in close contact, and the outer conical surface 81 and the inner conical surface 82 to be sealed against each other; then pass the pressing plate 5 through the pressure wedge penetration groove 61 on the pin wedge plate 6, and the first top plate part 51 and the second top plate part 52 of the pressing plate 5 are respectively pressed against the end faces of the tuyere sleeve 3 and the flange 4, and finally pass the wedge plate 7 through the pressure wedge penetration groove 61 on the pin wedge plate 6 to press the pressing plate 5, and the tuyere sleeve 3 is pressed. After all the installation is completed, the outer ends of the joint surfaces of the tuyere sleeve 3 and the flange 4 can be welded to further seal.

[0053] As described above, the structure for preventing gas leakage from the tuyere and the tuyere sleeve structure provided by the present invention have the following beneficial effects:

[0054] The structure for preventing gas leakage from the tuyere of the present invention adopts a pressure plate to connect the tuyere sleeve and the flange, replacing the bolt connection in the prior art. The pressure plate is fixedly pressed against the end surfaces of the tuyere sleeve and the flange to fix the tuyere sleeve. The structure is simple and easy to install. The side wall joint surface of the tuyere sleeve and the flange adopts a conical surface seal to abut against each other, which is tightly matched to seal the joint surface of the tuyere sleeve and the flange, forming a main seal. A sealing ring is arranged between the outer conical surface and the inner conical surface, and the flange and the tuyere sleeve joint surface are sealed by the sealing ring, which supplements the hard contact main seal, seals the gas, and plays the role of the first layer of auxiliary seal. The present invention has a simple structure, can effectively prevent gas leakage in the tuyere area, ensures the safety of the tuyere area, and is an effective means to achieve low consumption and safe production of blast furnaces.

[0055] The tuyere sleeve structure provided by the present invention adopts a structure for preventing tuyere gas leakage, and is welded at the joint between the tuyere sleeve and the flange to play a second layer of auxiliary sealing role, thereby achieving triple sealing between the tuyere sleeve and the flange, increasing the sealing performance, and effectively ensuring the safety of the tuyere area. It is an effective means to achieve low consumption and safety of the blast furnace.

[0056] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A structure for preventing gas leakage from an air outlet, used between an inner and outer stacked air outlet sleeve and a flange, characterized in that: It comprises a plurality of pressure plates capable of axially abutting against the fixed tuyere sleeve and the flange, the pressure plate comprising a bent plate portion spanning between the tuyere sleeve and the flange, one end of the bent plate portion being provided with a first top plate portion capable of abutting against the end surface of the flange, and the other end of the bent plate portion being provided with a second top plate portion capable of axially abutting against the end surface of the tuyere sleeve; the structure for preventing gas leakage from the tuyere further comprises an outer conical surface disposed on the outer wall of the tuyere sleeve and an inner conical surface disposed on the inner wall of the flange, the outer conical surface being capable of sealing against the inner conical surface, and a sealing ring being disposed between the outer conical surface and the inner conical surface; It also includes at least three pin wedge plates arranged on the end surface of the flange at circumferential intervals, and the number of the pin wedge plates is the same as the number of the pressure plates; each of the pin wedge plates is provided with a pressure wedge penetration groove extending radially through the flange, each of the pressure plates passes through each pressure wedge penetration groove respectively, and its bent plate portion is arranged across the pressure wedge penetration groove, and a wedge plate is wedged at one end of the bent plate portion away from the flange in each of the pressure wedge penetration grooves, and the wedge plate is used to fix and press the pressure plate; The length dimension of the first top plate portion of the pressing plate along the axial direction of the flange is smaller than the length dimension of the second top plate portion of the pressing plate along the axial direction of the flange; Each of the pin wedge plates is arranged in the form of a rectangular plate, and one end of each of the pin wedge plates is provided with the wedge pressing groove recessed inwardly, and the wedge pressing groove is arranged in the form of a rectangular notch.

2. The structure for preventing gas leakage from air outlet according to claim 1, characterized in that: The number of the pin wedge plates, the pressure plates and the wedge plates are all four, and the pin wedge plates are arranged on the end surface of the flange at even intervals in the circumferential direction.

3. A tuyere sleeve structure, characterized in that: It comprises a small tuyere sleeve, a middle tuyere sleeve and a large tuyere sleeve which are overlapped and arranged in a conical sleeve structure. The sealing sleeve at the large diameter end of the small tuyere sleeve is arranged on the inner side of the small diameter end of the middle tuyere sleeve; the sealing sleeve at the large diameter end of the middle tuyere sleeve is arranged on the inner side of the small diameter end of the large tuyere sleeve; a flange is arranged on the outer wall of the large diameter end of the large tuyere sleeve, and a structure for preventing gas leakage of the tuyere sleeve as claimed in claim 1 or 2 is arranged between the large tuyere sleeve and the flange.

4. The air inlet sleeve structure according to claim 3, characterized in that: The structure for preventing gas leakage from the tuyere includes a plurality of pressure plates that can axially abut against and fix the large tuyere sleeve and the flange, the pressure plate includes a bent plate portion spanning the large tuyere sleeve and the flange, one end of the bent plate portion is provided with a first top plate portion that can abut against the end surface of the flange, and the other end of the bent plate portion is provided with a second top plate portion that can axially abut against the end surface of the large tuyere sleeve; the structure for preventing gas leakage from the tuyere also includes an outer conical surface provided on the outer wall of the large diameter end of the large tuyere sleeve and an inner conical surface on the inner wall of the flange, the outer conical surface can be sealed against the inner conical surface, and a sealing ring is provided between the outer conical surface and the inner conical surface.

5. The tuyere sleeve structure according to claim 4, characterized in that: The structure for preventing gas leakage from the air outlet also includes at least three pin wedge plates circumferentially spaced apart on the end surface of the flange, and the number of the pin wedge plates is the same as the number of the pressure plates; each of the pin wedge plates is provided with a pressure wedge through groove which penetrates radially along the flange, each of the pressure plates passes through each of the pressure wedge through grooves respectively and its bent plate portion is straddled in the pressure wedge through groove, and a wedge plate is wedged in each of the pressure wedge through grooves at the end of the bent plate portion away from the flange, and the wedge plate is used to fix and press the pressure plate.

6. The air inlet sleeve structure according to claim 5, characterized in that: Each of the pin wedge plates is arranged in the form of a rectangular plate, and one end of each of the pin wedge plates is provided with the wedge pressing groove recessed inwardly, and the wedge pressing groove is arranged in the form of a rectangular notch.

7. The tuyere sleeve structure according to claim 4, characterized in that: A sealing ring groove is arranged on the outer conical surface of the large air outlet sleeve, the sealing ring is clamped in the sealing ring groove, and the radial outer side sealing top of the sealing ring is against the inner conical surface of the flange.

Images