Furnace tube and heating rotary furnace

Abstract

The utility model discloses a furnace tube and a heating rotary furnace, the furnace tube comprises a metal outer tube and a non-metal inner tube installed in the metal outer tube, the non-metal inner tube comprises a plurality of tube joints, one of two adjacent tube joints is provided with a slot, and the other one is provided with an insertion lug matched with the slot. By arranging the non-metal inner pipe in the metal outer pipe, part of materials or atmosphere with highly active chemical characteristics can be prevented from reacting with the metal outer pipe, so that the materials in the furnace pipe are prevented from being polluted, and the metal outer pipe is prevented from being eroded. The service life of the furnace tube and the heating rotary furnace can be prolonged without changing the original furnace tube structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary furnaces, and in particular relates to a furnace tube and a heating rotary furnace. Background Art

[0002] The heating rotary kiln is an industrial equipment widely used in metallurgy, building materials, chemical industry and other fields. It is mainly used for heating, roasting and melting of materials.

[0003] Traditional heating rotary kilns use metal furnace tubes. During use, the metal atoms in the metal furnace tubes may react with some materials with highly active chemical properties, causing the materials to be contaminated or the metal furnace tubes to be corroded. In addition, since the atmosphere required for some processes may react with the metal furnace tubes, it will also cause the materials to be contaminated and the metal furnace tubes to be corroded.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a furnace tube and a heating rotary kiln, which can protect the furnace tube, prevent material pollution, and increase the service life of the furnace tube and the heating rotary kiln.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] A furnace tube comprises a metal outer tube and a non-metal inner tube installed in the metal outer tube, the non-metal inner tube comprises a plurality of tube sections, one of two adjacent tube sections is provided with a slot, and the other is provided with a plug-in protrusion matched with the slot.

[0008] In one or more embodiments of the present invention, the non-metallic inner tube includes a first tube section, a second tube section, and at least one third tube section disposed between the first tube section and the second tube section.

[0009] In one or more embodiments of the present invention, the first pipe section is provided with a first slot, the third pipe section is provided with a first plug-in protrusion arranged toward the first pipe section and a second slot arranged toward the second pipe section, and the second pipe section is provided with a second plug-in protrusion.

[0010] In one or more embodiments of the present invention, the furnace tube also includes a first limiting ring fixedly installed in the metal outer tube, a second limiting ring fixedly installed in the metal outer tube and abutting against the third pipe section, and a third limiting ring movably installed in the metal outer tube and abutting against the first pipe section, and an elastic member is provided between the first limiting ring and the third limiting ring so that the third limiting ring has a tendency to move away from the first limiting ring.

[0011] In one or more embodiments of the present invention, the first pipe section includes a main body portion plugged into the third pipe section and an extension portion arranged away from the main body portion, the outer diameter of the extension portion is smaller than the outer diameter of the main body portion, and the third limiting ring abuts against the main body portion; and / or,

[0012] The furnace tube also includes a screw and a nut screwed onto the screw. The screw passes through the first limiting ring and is detachably installed in the third limiting ring. The nut abuts against the first limiting ring. The elastic member is sleeved on the screw.

[0013] In one or more embodiments of the present invention, the surface of the first pipe section away from the third pipe section and / or the surface of the second pipe section away from the third pipe section is a plane.

[0014] In one or more embodiments of the present invention, a limiting groove is provided on one of the inner wall of the metal outer tube and the outer wall of the non-metallic inner tube, and a limiting block matching with the limiting groove is provided on the other one.

[0015] In one or more embodiments of the present invention, a limit block is provided on the inner wall of the metal outer tube, a limit groove is provided on the outer wall of the non-metallic inner tube, and a reinforcing rib is provided on the inner wall of the non-metallic inner tube to be aligned with the limit groove.

[0016] In one or more embodiments of the present invention, the non-metallic inner tube is a ceramic inner tube.

[0017] Another specific embodiment of the present invention provides a technical solution as follows:

[0018] A heating rotary kiln comprises the above-mentioned furnace tube.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a furnace tube, which can prevent some materials or atmospheres with highly active chemical properties from reacting with the metal outer tube by arranging a non-metal inner tube in the metal outer tube, so as to avoid the materials in the furnace tube from being contaminated and the metal outer tube from being corroded;

[0021] The utility model has a simple structure and can increase the service life of the furnace tube without changing the original furnace tube structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic cross-sectional view of the furnace tube in the first embodiment of the utility model;

[0024] Figure 2 for Figure 1 A magnified view of the local structure at point A in the middle;

[0025] Figure 3 for Figure 1 A magnified view of the local structure at B in the middle;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the pipe segment in the first embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0031] Embodiment 1:

[0032] Reference Figure 1 to Figure 3As shown, the furnace tube in this embodiment includes a metal outer tube 1 and a non-metal inner tube 2 installed in the metal outer tube 1. The non-metal inner tube 2 includes a plurality of tube sections, one of two adjacent tube sections is provided with a slot, and the other is provided with a plug-in protrusion that matches the slot. By arranging the non-metal inner tube 2 in the metal outer tube 1, it is possible to prevent some highly chemically active materials or atmospheres from reacting with the metal outer tube 1, so as to avoid the materials in the furnace tube from being contaminated and the metal outer tube 1 from being corroded. The utility model can increase the service life of the furnace tube without changing the original furnace tube structure.

[0033] The metal outer tube 1 may be a stainless steel outer tube, and the non-metal inner tube 2 may be a ceramic inner tube.

[0034] Since the length of the metal outer tube 1 is relatively long, in order to allow the non-metallic inner tube 2 to be arranged to match the length of the metal outer tube 1, the non-metallic inner tube 2 in this embodiment includes a first tube segment 21, a second tube segment 22, and at least one third tube segment 23 disposed between the first tube segment 21 and the second tube segment 22. The number of the third tube segments 23 is not limited. Exemplarily, the non-metallic inner tube 2 in this embodiment includes a first tube segment 21 disposed inside the first end of the metal outer tube 1, a second tube segment 22 disposed inside the second section of the metal outer tube 1, and 41 third tube segments 23 disposed inside the metal outer tube 1 and located inside the first tube segment 21 and the second tube segment 22.

[0035] Reference Figure 2 , Figure 3 As shown, in this embodiment, the first pipe section 21 is provided with a first slot 210, the third pipe section 23 is provided with a first plugging protrusion 220 arranged toward the first pipe section 21 and a second slot arranged toward the second pipe section 22, and the second pipe section 22 is provided with a second plugging protrusion 231. The first pipe section 21 and the third pipe section 23 can be plugged together by the mutual cooperation of the first slot 210 and the first plugging protrusion 220, and the third pipe section 23 and the second pipe section 22 can be plugged together by the mutual cooperation of the second slot and the second plugging protrusion 231. When multiple third pipe sections 23 are provided, the first third pipe section 23 is plugged with the first pipe section 21, and the last third pipe section 23 is plugged with the second pipe section 22. The adjacent two third pipe sections 23 are plugged together by plugging the second slot of the previous third pipe section 23 and the first plugging protrusion 220 of the next third pipe section 23, so as to provide a non-metallic inner pipe 2 of sufficient length.

[0036] In this embodiment, the surface of the first pipe segment 21 away from the third pipe segment 23 and the surface of the second pipe segment 22 away from the third pipe segment 23 are planes.

[0037] Since the non-metallic inner tube 2 will undergo thermal expansion under high temperature conditions, in order to prevent the two ends of the non-metallic inner tube 2 from axial movement, refer to Figure 1As shown, the furnace tube in this embodiment also includes a first limiting ring 31 fixedly installed in the metal outer tube 1, a second limiting ring 32 fixedly installed in the metal outer tube 1 and abutting against the second tube section 22, and a third limiting ring 33 movably installed in the metal outer tube 1 and abutting against the first tube section 21. Among them, the distance between the first limiting ring 31 and the third limiting ring 33 is greater than the thermal expansion of the non-metallic inner tube 2. In order to prevent the third limiting ring 33 from being separated from the first tube section 21, an elastic member 4 is provided between the first limiting ring 31 and the third limiting ring 33, so that the third limiting ring 33 has a tendency to move away from the first limiting ring 31. Among them, the elastic member 4 can be an elastic part such as a spring or an airbag. The two ends of the non-metallic inner tube 2 are respectively abutted against the second limit ring 32 and the third limit ring 33. When the non-metallic inner tube 2 undergoes thermal expansion, the position of the third tube segment 23 of the non-metallic inner tube 2 remains unchanged, and the first tube segment 21 of the non-metallic inner tube 2 drives the third limit ring 33 to move toward the first limit ring 31.

[0038] Specifically, refer to Figure 1 As shown, the first pipe section 21 in this embodiment includes a main body 211 plugged with the third pipe section 23 and an extension portion 212 arranged away from the main body 211, the outer diameter of the extension portion 212 is smaller than the outer diameter of the main body 211, and the third limiting ring 33 abuts against the main body 211. The extension portion 212, the main body 211, and the metal outer tube 1 are surrounded to form a receiving cavity. In order to install the first limiting ring 31 and the third limiting ring 33 in the receiving cavity, the inner diameter of the first limiting ring 31 and the inner diameter of the third limiting ring 33 are both smaller than the outer diameter of the extension portion 212, and the outer diameter of the first limiting ring 31 and the outer diameter of the third limiting ring 33 are both smaller than the inner diameter of the metal outer tube 1. According to this design, the first limiting ring 31, the second limiting ring 32, and the third limiting ring 33 can prevent the non-metallic inner tube 2 from axial movement.

[0039] The first limiting ring 31 and the second limiting ring 32 can be installed in the metal outer tube 1 by means of a plurality of fasteners such as screws and bolts arranged in the radial direction.

[0040] Optionally, in order to install the non-metallic inner tube 2 in the metal outer tube 1, refer to Figure 1As shown, the furnace tube in this embodiment also includes a screw 51 and a nut 52 screwed on the screw 51. The screw 51 passes through the first limiting ring 31 and is detachably installed in the third limiting ring 33. The nut 52 abuts against the first limiting ring 31, and the elastic member 4 is sleeved on the screw 51. A through hole is provided on the first limiting ring 31, and a threaded hole is provided on the third limiting ring 33. When the heating rotary kiln is not working, the screw 51 passes through the through hole on the first limiting ring 31 and is screwed into the threaded hole of the third limiting ring 33. The nut 52 is screwed on the screw 51. The nut 52 is rotated through the external structure to adjust the position of the nut 52 on the screw 51, and the first pipe section 21, the second pipe section 22, and the third pipe section 23 are firmly plugged. When the heating rotary kiln is working, the screw 51 needs to be separated from the third limiting ring 33 and removed from the first limiting ring 31, or the screw 51 is still installed on the first limiting ring 31 and has a certain distance from the third limiting ring 33, so that the third limiting ring 33 can move axially in the receiving cavity to facilitate the thermal expansion of the non-metallic inner tube 2.

[0041] Since the metal outer tube 1 rotates around its axial direction when the heating rotary kiln is working, in order to prevent the metal outer tube 1 and the non-metal inner tube 2 from rotating relative to each other in the radial direction during the rotation of the metal outer tube 1, refer to Figure 1 As shown, in this embodiment, one of the inner wall of the metal outer tube 1 and the outer wall of the non-metal inner tube 2 is provided with a limiting groove, and the other is provided with a limiting block 6 that matches the limiting groove. Through the mutual cooperation of the limiting groove and the limiting block 6, the position of the metal outer tube 1 and the non-metal inner tube 2 can be fixed. Among them, the specific position and specific number of the limiting groove and the limiting block 6 are not limited.

[0042] For example, refer to Figure 4 As shown, in this embodiment, a stopper block 6 is provided on the inner wall of the metal outer tube 1, and a stopper groove is provided on the outer wall of the non-metal inner tube 2, that is, a groove 7 is provided on the outer wall of each tube section, and each groove 7 is aligned and connected to form a stopper groove. Exemplarily, in this embodiment, there are 5 stopper grooves and they are arranged on the outer wall of the non-metal inner tube 2 at intervals along the circumferential direction.

[0043] Reference Figure 4 As shown, when a limiting groove is provided on the outer wall of the non-metallic inner tube 2, a reinforcing rib is provided on the inner wall of the non-metallic inner tube 2 in this embodiment and is aligned with the limiting groove, that is, a protrusion 8 is provided on the inner wall of each tube section, and every two adjacent protrusions 8 are aligned and connected to form a reinforcing rib. According to this design, the wall thickness of the non-metallic inner tube 2 where the limiting groove is provided can be increased to ensure the strength of the entire non-metallic inner tube 2.

[0044] Embodiment 2:

[0045] The heating rotary kiln in this embodiment includes the furnace tube in the first embodiment. By arranging a non-metallic inner tube in a metal outer tube, the service life of the heating rotary kiln can be increased without changing the original furnace tube structure.

[0046] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0047] The utility model provides a furnace tube and a heating rotary furnace. By arranging a non-metallic inner tube in a metal outer tube, some materials or atmospheres with highly active chemical properties can be prevented from reacting with the metal outer tube, so as to avoid the materials in the furnace tube from being contaminated and the metal outer tube from being corroded.

[0048] The utility model has a simple structure and can increase the service life of the furnace tube and the heating rotary furnace without changing the original furnace tube structure.

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A furnace tube, characterized in that: The furnace tube comprises a metal outer tube and a non-metal inner tube installed in the metal outer tube. The non-metal inner tube comprises a plurality of tube sections. One of two adjacent tube sections is provided with a slot, and the other is provided with a plug-in protrusion matched with the slot.

2. The furnace tube according to claim 1, characterized in that The non-metallic inner pipe includes a first pipe section, a second pipe section, and at least one third pipe section disposed between the first pipe section and the second pipe section.

3. The furnace tube according to claim 2, characterized in that The first pipe section is provided with a first slot, the third pipe section is provided with a first plug-in protrusion arranged toward the first pipe section and a second slot arranged toward the second pipe section, and the second pipe section is provided with a second plug-in protrusion.

4. The furnace tube according to claim 2, characterized in that: The furnace tube also includes a first limiting ring fixedly installed in the metal outer tube, a second limiting ring fixedly installed in the metal outer tube and abutting against the second tube section, and a third limiting ring movably installed in the metal outer tube and abutting against the first tube section. An elastic member is provided between the first limiting ring and the third limiting ring so that the third limiting ring has a tendency to move away from the first limiting ring.

5. The furnace tube according to claim 4, characterized in that The first pipe section comprises a main body part plugged with the third pipe section and an extension part arranged away from the main body part, the outer diameter of the extension part is smaller than the outer diameter of the main body part, and the third limiting ring abuts against the main body part; and / or, The furnace tube also includes a screw and a nut screwed onto the screw. The screw passes through the first limiting ring and is detachably installed in the third limiting ring. The nut abuts against the first limiting ring. The elastic member is sleeved on the screw.

6. The furnace tube according to claim 2, characterized in that The surface of the first pipe section away from the third pipe section and / or the surface of the second pipe section away from the third pipe section is a plane.

7. The furnace tube according to claim 1, characterized in that One of the inner wall of the metal outer tube and the outer wall of the non-metal inner tube is provided with a limiting groove, and the other is provided with a limiting block matched with the limiting groove.

8. The furnace tube according to claim 1, characterized in that A limiting block is arranged on the inner wall of the metal outer tube, a limiting groove is arranged on the outer wall of the non-metal inner tube, and a reinforcing rib arranged in alignment with the limiting groove is arranged on the inner wall of the non-metal inner tube.

9. The furnace tube according to claim 1, characterized in that The non-metal inner tube is a ceramic inner tube.

10. A heating rotary kiln, characterized in that: The heating rotary kiln comprises the furnace tube according to any one of claims 1 to 9.

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