Medium-scouring-preventing welding-free composite ceramic nozzle

Abstract

A welding-free composite ceramic nozzle capable of preventing medium scouring comprises a ceramic tube core, an inner sleeve and an outer sleeve, an outer ring groove and an outer flange are arranged on the ceramic tube core, the outer flange is located at the medium outlet end, and a check ring is installed in the outer ring groove; the inner sleeve is sleeved on the ceramic tube core and is limited between the retainer ring and the outer flange; the inner sleeve is provided with an outer thread, the outer sleeve is provided with an inner flange and an inner thread, after the outer sleeve is in threaded connection with the inner sleeve, the inner flange of the outer sleeve abuts against the medium inlet end of the ceramic tube core, and an annular space is formed between the ceramic tube core and the outer sleeve. Due to the existence of the outer flanging, the inner sleeve is separated from a gas-solid medium, so that the inner sleeve is prevented from being scoured by the gas-solid medium. The composite ceramic nozzle has multiple installation modes on equipment, during welding installation, the annular space can release welding deformation of the outer sleeve, and the situation that the welding deformation and residual stress of the welding deformation directly act on the ceramic tube core, and the ceramic tube core is squeezed to be cracked and broken is avoided.

Description

Technical Field

[0001] The utility model relates to the field of petroleum refining equipment, in particular to a composite ceramic nozzle which is resistant to medium scouring and free of welding. Background Art

[0002] In industries such as petrochemicals, power generation, and metallurgy, nozzle wear caused by high-temperature, high-velocity gas-solid erosion and solid particle backflow has long plagued the long-term operation of gas-solid fluidization reactors. In recent years, composite ceramic nozzles have gained widespread application due to their excellent wear resistance and low cost.

[0003] Refer to the attached Figure 1 . The existing composite ceramic nozzle is mainly composed of a ceramic tube core 10, a metal sleeve 101 and a metal ring piece 102. During assembly, the ceramic tube core 10 is inserted into the metal sleeve 101, and then the metal ring piece 102 is welded to the metal sleeve 101. The ceramic tube core 10 has good high temperature resistance, wear resistance and corrosion resistance, but it is brittle and easy to break. The function of the metal ring piece 102 is to prevent the ceramic tube core 10 from falling out of the metal sleeve 101, and the function of the metal sleeve 101 is to prevent the ceramic tube core 10 from being bumped, and at the same time facilitate the installation of the composite ceramic nozzle on the equipment. During the welding and forming process, we found that a small number of ceramic tube cores were broken.

[0004] Depending on the installation requirements, composite ceramic nozzles can be installed on the equipment in two ways: flange bolt connection or welding. For welding, a full weld is typically used to ensure a tight seal. During the welding installation process, we observed some ceramic cores breaking, with the breakage rate exceeding 20% ​​in severe cases.

[0005] The main reason for the ceramic tube core fragmentation is that the composite ceramic nozzle is manufactured and installed by welding. Especially during installation, the local high temperature, welding deformation, and residual welding stress generated by full welding of the outer sleeve directly act on the ceramic tube core, squeezing or even crushing the ceramic tube core.

[0006] Furthermore, during operation, the outlet of the composite ceramic nozzle is severely eroded by the eddy current of the high-speed medium (containing solid particles), causing rapid wear of the metal ring. Once the metal ring falls off due to wear, the ceramic core will fall out of the metal sleeve. Utility Model Content

[0007] In order to overcome the shortcomings of the background technology, the utility model discloses a composite ceramic nozzle that is resistant to medium erosion and free of welding, the purpose of which is:

[0008] 1. Improve the assembly structure of the composite ceramic nozzle itself, replace welding with threaded connection to avoid the ceramic core from breaking during assembly;

[0009] 2. Improve the structure of the composite ceramic nozzle to prevent the metal sleeve and metal ring from being eroded by the gas-solid medium, thereby causing the ceramic tube core to fall out of the metal sleeve;

[0010] 3. Prevent welding deformation and residual stress from cracking and crushing the ceramic tube core.

[0011] Specifically, the present invention adopts the following technical solutions:

[0012] A composite ceramic nozzle that is resistant to medium erosion and weld-free, comprises a ceramic tube core, an inner sleeve and an outer sleeve. The ceramic tube core is provided with an outer annular groove and an outer flange, wherein the outer flange is located at the outlet end of the medium, and a retaining ring is installed in the outer annular groove; the inner sleeve is sleeved on the ceramic tube core and is limited between the retaining ring and the outer flange; the inner sleeve has an outer thread, and the outer sleeve has an inner flange and an inner thread. After the outer sleeve and the inner sleeve are screwed together, the inner flange of the outer sleeve abuts against the medium inlet end of the ceramic tube core, forming an annular space between the ceramic tube core and the outer sleeve.

[0013] After implementing the above technical solution, compared with the background technology, the beneficial effects produced are:

[0014] 1. The composite ceramic nozzle adopts a threaded assembly structure instead of a welding structure, so the ceramic core will not break.

[0015] 2. The ceramic tube core has good wear resistance. An outer flange is set at the medium outlet end of the ceramic tube core. During operation, the outer flange separates the inner sleeve from the gas-solid medium, so that the inner sleeve is prevented from being eroded by the gas-solid medium and plays a protective role on the inner sleeve.

[0016] 3. The outer sleeve and the inner sleeve have a certain strength, and the whole formed by their combination plays a role in protecting the ceramic tube core during use and transportation.

[0017] 4. According to the construction requirements, the composite ceramic nozzle has a variety of installation forms on the equipment.

[0018] 5. When the composite ceramic nozzle is welded and installed, the annular space can release the welding deformation of the outer sleeve, and the inner sleeve can separate the further deformation of the outer sleeve, thereby preventing the welding deformation and its residual stress from directly acting on the ceramic tube core to crack or crush the ceramic tube core.

[0019] To further improve the technical solution, the retaining ring is a split-type retaining ring or an open-type retaining ring.

[0020] After implementing the above technical solution, the beneficial effect is that the retaining ring is used to provide axial limit for the inner sleeve. The purpose of using a split retaining ring or an open retaining ring is to facilitate its installation and fixation on the ceramic tube core.

[0021] To further improve the technical solution, a plastic refractory material is applied between the inner flange of the outer sleeve and the medium inlet end of the ceramic tube core.

[0022] After implementing the above technical solution, the beneficial effects are: applying plastic refractory material between the inner flange of the outer sleeve and the medium inlet end of the ceramic tube core can avoid rigid contact between the inner flange and the ceramic tube core and play a sealing role.

[0023] To further improve the technical solution, a tightening nut is threaded on the inner sleeve, and the tightening nut is used to eliminate the assembly gap between the inner sleeve and the retaining ring and the outer flange.

[0024] The implementation of the above technical solution has the following beneficial effects: Due to manufacturing process reasons, the distance between the retaining ring and the outer flange is difficult to accurately control. Before the outer sleeve is assembled, the retaining ring and inner sleeve are not fixed in their axial position on the ceramic tube core, which can easily cause the retaining ring to fall off, making assembly inconvenient. After the tightening nut is installed, the axial position of the retaining ring and inner sleeve on the ceramic tube core can be tightened and fixed in advance, improving assembly efficiency.

[0025] To further improve the technical solution, the tightening nut abuts against the retaining ring, and a plastic refractory material is applied between the inner sleeve and the outer flange of the ceramic tube core.

[0026] After the above technical solution is implemented, the beneficial effect produced is that the plastic refractory material can avoid rigid contact between the inner sleeve and the outer flange of the ceramic tube core.

[0027] To further improve the technical solution, the tightening nut abuts against the outer flange of the ceramic tube core, and a plastic refractory material is filled in the gap between the tightening nut and the ceramic tube core.

[0028] After implementing the above technical solution, the beneficial effect is that the plastic refractory material can fill the gap between the inner sleeve and the outer flange of the ceramic tube core, avoiding rigid contact between the tightening nut and the outer flange of the ceramic tube core.

[0029] To further improve the technical solution, plastic refractory material is provided in the annular space.

[0030] After implementing the above technical solution, the beneficial effects are: for the installation method using welding, plastic refractory material is arranged in the annular space, which can isolate heat conduction and support and protect the ceramic tube core.

[0031] To further improve the technical solution, a flange mounting plate is provided on the inner sleeve or the outer sleeve.

[0032] After the above technical solution is implemented, the beneficial effect produced is: a flange mounting plate is provided on the inner sleeve or the outer sleeve, so as to facilitate the installation of the composite ceramic nozzle on the equipment.

[0033] To further improve the technical solution, a clamping structure or an anchoring structure is provided on the inner sleeve.

[0034] After the above technical solution is implemented, the beneficial effect produced is: providing a clamping structure or an anchoring structure on the inner sleeve is conducive to achieving the threaded connection between the inner sleeve and the outer sleeve.

[0035] To further improve the technical solution, the composite ceramic nozzle is installed on the distributor, a wear-resistant lining is laid on the surface of the distributor, the outer flange of the ceramic tube core is embedded in the wear-resistant lining, and its outer end face is flush with the wear-resistant lining; the clamping structure or anchoring structure is embedded in the wear-resistant lining, which is used to anchor the wear-resistant lining so that the composite ceramic nozzle is tightly combined with the wear-resistant lining.

[0036] Implementation of the above technical solution yields the following beneficial effects: the wear-resistant lining protects the inner and outer casings from erosion by gas-solid media. The outer flange, clamping structure, or anchoring structure of the ceramic core anchors the wear-resistant lining, preventing it from falling off around the composite ceramic nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Attachment Figure 1 Shown is a schematic structural diagram of an existing composite ceramic nozzle.

[0038] Attachment Figure 2 Shown is a schematic diagram of the installation structure of the composite ceramic nozzle on the distribution pipe in Example 1.

[0039] Attachment Figure 3 Shown is a schematic diagram of the cross-sectional structure of the ceramic tube core in Example 1.

[0040] Attachment Figure 4 The figure shows the installation structure diagram of the inner sleeve on the ceramic tube core in Example 1.

[0041] Attachment Figure 5 The figure shows a schematic diagram of the connection structure between the outer sleeve and the inner sleeve in Example 1.

[0042] Attachment Figure 6 Shown is a schematic diagram of the cross-sectional structure of the composite ceramic nozzle in Example 2.

[0043] Attachment Figure 7 Shown is a schematic diagram of an implementation structure of the composite ceramic nozzle in Example 3.

[0044] Attachment Figure 8 Shown is another schematic diagram of the structure of the composite ceramic nozzle in Example 3.

[0045] Attachment Figure 9-10 Shown is a schematic structural diagram of the composite ceramic nozzle in Example 4.

[0046] Attachment Figure 11 Shown is a schematic diagram of the anchoring structure in Example 5.

[0047] Attachment Figure 12 Shown is a schematic diagram of the installation structure of the composite ceramic nozzle on the distribution pipe in Example 5.

[0048] Attachment Figure 13 The figure shows a schematic diagram of an installation structure of a composite ceramic nozzle in Example 6 on a certain refining equipment.

[0049] Attachment Figure 14 Shown is another schematic diagram of the installation structure of the composite ceramic nozzle in Example 6 on a certain refining equipment.

[0050] Reference numerals

[0051] 10. Ceramic tube core; 11. Outer ring groove; 12. Outer flange;

[0052] 20. Inner casing; 21. External thread; 22. Clamping structure; 23. Anchoring structure;

[0053] 30. Outer sleeve; 31. Inner flange; 32. Internal thread; 33. Flange;

[0054] 40. Retaining ring;

[0055] 51. First annular space; 52. Second annular space; 53. Third annular space;

[0056] 61. Ceramic fiber paper; 62. Refractory clay;

[0057] 70. Tighten the nut;

[0058] 80. Distribution pipe;

[0059] 90. Wear-resistant lining;

[0060] 101. Metal sleeve; 102. Metal ring. DETAILED DESCRIPTION

[0061] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that, in the description of the present invention, terms such as "front," "rear," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can mean fixed, detachable, or integral; mechanical or electrical; direct, indirect through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1:

[0062] Refer to the attached Figure 2 A composite ceramic nozzle designed to prevent media erosion and avoid welding is primarily composed of a ceramic core 10, an inner sleeve 20, and an outer sleeve 30. It is used to introduce a gaseous or liquid medium into a distributor. The composite ceramic nozzle is welded to a mounting hole in a distributor pipe 80, which is then covered with a wear-resistant lining 90.

[0063] Refer to the attached Figure 3 , attached Figure 3 The figure shows a cross-sectional view of the ceramic tube core 10. Figure 3 It can be seen that an outer ring groove 11 and an outer flange 12 are provided on the ceramic tube core 10, wherein the outer flange 12 is located at the outlet end of the medium.

[0064] Refer to the attached Figure 4 , attached Figure 4 The figure shows the installation structure of the inner sleeve 20 on the ceramic tube core 10. Figure 4 It can be seen that the inner sleeve 20 is in the shape of a circular tube and has an external thread 21 on the upper portion of the inner sleeve 20. A retaining ring 40 is installed in the outer ring groove 11 of the ceramic tube core 10. The inner sleeve 20 is sleeved on the ceramic tube core 10 and is limited between the retaining ring 40 and the outer flange 12.

[0065] Since threads cannot be machined onto the ceramic tube core 10, one of the functions of the inner sleeve 20 is to provide a connection structure for the external threads 21 of the ceramic tube core 10. The retaining ring 40 serves to provide axial positioning for the inner sleeve 20. To facilitate the installation and fixation of the inner sleeve 20 on the ceramic tube core 10, the retaining ring 40 can be a split-type retaining ring or an open-type retaining ring.

[0066] Refer to the attached Figure 5 , attached Figure 5 The figure shows the connection structure diagram of the outer sleeve 30 and the inner sleeve 20. Figure 5 As can be seen, the outer sleeve 30 has an inner flange 31 at its upper end and an internal thread 32 at its lower end. When the outer sleeve 30 is threadedly connected to the inner sleeve 20, the inner flange 31 of the outer sleeve 30 abuts the medium inlet end of the ceramic tube core 10, while the upper end of the inner sleeve 20 abuts the retaining ring 40. A first annular space 51 is formed in the non-threaded area between the inner and outer sleeves 20 and 30, located near the medium outlet end. A second annular space 52 is formed between the outer sleeve 30 and the ceramic tube core 10, located near the medium inlet end.

[0067] Refer again to the attached Figure 2 An outer flange 12 is provided at the medium outlet end of the ceramic tube core 10. Firstly, the outer flange 12 is wear-resistant and can withstand the erosion of the gas-solid medium, thus protecting the inner sleeve 20; secondly, the outer flange 12 is embedded in the wear-resistant lining 90, thus anchoring the wear-resistant lining 90.

[0068] When the composite ceramic nozzle and the distribution pipe 80 are fully welded, the welding position is set at the portion of the outer sleeve 30 corresponding to the first annular space 51. The outer sleeve 30 will undergo significant deformation during full welding. Due to the presence of the first annular space 51, the outer sleeve 30 has sufficient space to release welding deformation, preventing welding deformation and its residual stress from directly acting on the ceramic tube core 10, thereby cracking or crushing the ceramic tube core 10. The inner sleeve 20 is located between the first annular space 51 and the ceramic tube core 10. Since the inner sleeve 20 does not undergo red-hot softening during the welding process and maintains a certain strength, the inner sleeve 20 can isolate the outer sleeve 30 from deformation and protect the ceramic tube core 10.

[0069] Because the outer sleeve 30 and the inner sleeve 20 are threaded together, we initially worried that the ceramic tube core 10 might loosen during operation. However, we have found in long-term engineering applications that this has not occurred. The reason is that the welding deformation of the outer sleeve 30 destroys the thread structure between the inner sleeves 20 and 30, preventing the threads from loosening, and the inner sleeves 20 and 30 form a single unit. Example 2:

[0070] Refer to the attached Figure 6 Compared with Example 1, this embodiment has four improved technical points.

[0071] The first technical improvement is the placement of a shaped plastic refractory material within the second annular space 52. In this embodiment, the plastic refractory material is ceramic fiber paper 61, which is wrapped around and fixed to the ceramic tube core 10. The ceramic fiber paper 61 can isolate heat conduction and provide support and protection for the ceramic tube core 10.

[0072] The second improved technical point is that a plastic refractory material is applied between the inner flange 31 of the outer sleeve 30 and the medium inlet end of the ceramic tube core 10. In this embodiment, the plastic refractory material is refractory cement 62. After the outer sleeve 30 and the inner sleeve 20 are tightened by threads, the inner flange 31 will exert an extrusive force on the ceramic tube core 10. Applying the refractory cement 62 can prevent the ceramic tube core 10 from rigidly contacting the inner flange 31, thereby preventing the ceramic tube core 10 from breaking.

[0073] The third technical improvement is the application of a plastic refractory material between the inner sleeve 20 and the outer flange 12 of the ceramic core 10. In this embodiment, the plastic refractory material is a refractory mortar 62. The application of the refractory mortar 62 eliminates the gap and prevents the outer flange 12 of the ceramic core 10 from rigidly contacting the inner sleeve 20, thereby preventing the outer flange 12 from breaking.

[0074] The fourth technical improvement is that the upper groove surface of the outer ring groove 11 of the ceramic tube core 10 is tilted upward, forming an outer conical surface. Accordingly, the retaining ring 40 has an inner conical surface that mates with the outer conical surface. When the outer sleeve 30 and the inner sleeve 20 are screwed together, the inner sleeve 20 exerts a compressive force on the upper groove surface of the outer ring groove 11 through the retaining ring 40. This compressive force may cause the ceramic tube core 10 to break. After the conical surface is matched, part of the compressive force is dispersed by the conical surface to the outer sleeve 30, thereby reducing the compressive force on the outer ring groove 11. Example 3:

[0075] Due to the firing process of the ceramic tube core 10, the distance between the outer ring groove 11 and the outer flange 12 is difficult to accurately control. During the threaded connection between the outer sleeve 30 and the inner sleeve 20, the retaining ring moves up and down or overturns due to the axial non-positioning of the retaining ring, affecting the reliability of the threaded connection between the inner and outer sleeves.

[0076] Refer to the attached Figure 7 A locking nut 70 is threaded onto the upper portion of the inner sleeve 20. By screwing the locking nut 70 upward, the lower end of the inner sleeve 20 rests against the outer flange 12, eliminating play and axially positioning the retaining ring 40 before installing the outer sleeve 30. If the gap between the inner sleeve 20 and the retaining ring 40 is too large, refractory mortar 62 can be applied to the gap.

[0077] In addition, in order to fix the inner sleeve 20 and facilitate the threaded connection between the outer sleeve 30 and the inner sleeve 20, a clamping structure 22 is provided at the lower end of the inner sleeve 20. Figure 7 In the embodiment, the clamping structure 22 is a disc with knurling provided on the edge of the disc. By clamping the disc, the outer sleeve 30 and the inner sleeve 20 can be screwed together.

[0078] Refer to the attached Figure 8 Alternatively, a locking nut 70 can be screwed onto the lower portion of the inner sleeve 20. By screwing the locking nut 70 downward, the upper end of the inner sleeve 20 rests against the retaining ring 40 to eliminate play. This allows the retaining ring 40 to be axially positioned before installing the outer sleeve 30. If the gap between the inner sleeve 20 and the outer flange 12 is too large, refractory mortar 62 can be applied to the gap. The contact surface between the locking nut 70 and the outer flange 12 of the ceramic core must also be coated with mortar to prevent rigid contact between the two.

[0079] Attachment Figure 8 In the embodiment, the clamping structure 22 comprises three sets of hexagonal clamping surfaces. By clamping one set of the clamping surfaces with a wrench, the outer sleeve 30 and the inner sleeve 20 can be screwed together. It is worth noting that the clamping structure 22 is not limited to the two structures described above, and can also have other shapes and structures, such as holes, shafts, teeth, etc. Example 4:

[0080] Refer to the attached Figure 9 In this embodiment, the lower surface of the outer annular groove 11 on the ceramic core 10 coincides with the outer flange 12. This creates a third annular space 53 between the inner sleeve 20 and the ceramic core 10. The inner sleeve 20 protects the ceramic core 10, and the third annular space 53 prevents compression of the ceramic core 10 even if the inner sleeve 20 deforms.

[0081] Refer to the attached Figure 10 A ceramic fiber paper 61 may also be provided in the third annular space 53. Before installing the inner sleeve 20, the ceramic fiber paper 61 is wrapped around and fixed on the ceramic tube core 10. The ceramic fiber paper 61 can support and protect the ceramic tube core 10. Example 5:

[0082] Refer to the attached Figure 11 An anchoring structure 23 may also be provided on the inner sleeve 20. During installation, the anchoring structure 23 is buried in the wear-resistant lining 90 to anchor the wear-resistant lining 90. In this embodiment, the anchoring structure 23 is a plurality of anchoring rods screwed onto the inner sleeve 20.

[0083] Refer to the attached Figure 12The outer surface of the distribution pipe 80 is covered with a wear-resistant lining 90. The outer flange 12 of the ceramic tube core 10 is embedded in the wear-resistant lining 90, and its outer end surface is flush with the wear-resistant lining 90. Anchor rods are embedded in the wear-resistant lining 90, anchoring the wear-resistant lining 90 and tightly bonding the composite ceramic nozzle to the wear-resistant lining 90, preventing the wear-resistant lining 90 from falling off around the composite ceramic nozzle. The wear-resistant lining 90 protects the inner and outer sleeves 20, 30, preventing them from being eroded by the gas-solid medium. Example 6:

[0084] According to the needs of construction, the composite ceramic nozzle can also be installed on the equipment in a non-welding manner.

[0085] Refer to the attached Figure 13 , attached Figure 13 The figure shows a schematic diagram of the installation structure of a composite ceramic nozzle on a certain refining equipment. Figure 13 It can be seen that the clamping structure 22 on the inner sleeve 20 is disc-shaped, with a diameter larger than that of the outer sleeve 30, and multiple connection holes are provided on the clamping structure 22. During installation, the composite ceramic nozzle is fixed to the refining equipment by screws.

[0086] Refer to the attached Figure 14 , attached Figure 14 The figure shows another installation structure diagram of composite ceramic nozzle on a certain refining equipment. Figure 14 It can be seen that a flange 33 is provided on the outer sleeve 30. During installation, the composite ceramic nozzle is fixed to the refining equipment by screws.

[0087] It is worth noting that the non-welding installation method of the composite ceramic nozzle on the equipment is not limited to the above-mentioned connection method, and threaded connection, riveting and other methods can also be used.

[0088] Parts not described in detail are prior art. Although the embodiments of the present invention have been shown and described, it will be understood 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 present invention, and the scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite ceramic nozzle that is resistant to medium erosion and free of welding, comprising a ceramic core, an inner sleeve and an outer sleeve, characterized in that: The ceramic tube core is provided with an outer ring groove and an outer flange, wherein the outer flange is located at the outlet end of the medium, and a retaining ring is installed in the outer ring groove; the inner sleeve is sleeved on the ceramic tube core and is limited between the retaining ring and the outer flange; the inner sleeve has an outer thread, and the outer sleeve has an inner flange and an inner thread. After the outer sleeve and the inner sleeve are screwed together, the inner flange of the outer sleeve abuts against the medium inlet end of the ceramic tube core, and an annular space is formed between the ceramic tube core and the outer sleeve.

2. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: The retaining ring is a split-type retaining ring or an open-type retaining ring.

3. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: A plastic refractory material is applied between the inner flange of the outer sleeve and the medium inlet end of the ceramic tube core.

4. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: A tightening nut is threaded on the inner sleeve, and the tightening nut is used to eliminate the assembly gap between the inner sleeve and the retaining ring and the outer flange.

5. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 4, characterized in that: The tightening nut abuts against the retaining ring, and plastic refractory material is applied between the inner sleeve and the outer flange of the ceramic tube core.

6. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 4, characterized in that: The tightening nut abuts against the outer flange of the ceramic tube core, and a plastic refractory material is filled in the gap between the tightening nut and the ceramic tube core.

7. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: Plastic refractory material is arranged in the annular space.

8. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: A flange mounting plate is provided on the inner sleeve or the outer sleeve.

9. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 1, characterized in that: A clamping structure or an anchoring structure is provided on the inner sleeve.

10. The composite ceramic nozzle that is resistant to medium erosion and weld-free as claimed in claim 9, characterized in that: The composite ceramic nozzle is installed on the distributor, and a wear-resistant lining is laid on the surface of the distributor. The outer flange of the ceramic tube core is embedded in the wear-resistant lining, and its outer end face is flush with the wear-resistant lining; the clamping structure or anchoring structure is embedded in the wear-resistant lining and is used to anchor the wear-resistant lining so that the composite ceramic nozzle is tightly combined with the wear-resistant lining.

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