Radiant tube and heater

Abstract

The radiant tube is applied to the heater, the heater is provided with a heating cavity, a mounting opening is formed in one side wall face of the heating cavity, and the radiant tube comprises a tube body, a heating element and a heating element, the heating element is arranged on the pipe main body; the first radiation assembly is arranged along the length direction of the tube main body; the two second radiation assemblies are oppositely arranged on the tube main body, and the first radiation assemblies and the second radiation assemblies are arranged in a crossed mode; according to the radiant tube, the first radiation assembly extends in the length direction of the tube body, and the second radiation assemblies are arranged in a crossed mode to form a radiation network, so that the radiation area is increased; the two ends of the tube body are connected with the second radiation assemblies through the opposite-pulling assemblies, axial pulling force can be applied to the center from the two ends of the tube body, gravity sagging of the middle section is effectively counteracted, the axial rigidity of the tube body is improved, and high-temperature deformation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating devices, in particular to a radiation pipe and a heater. BACKGROUND

[0002] The radiation pipe is a heat energy conversion device widely used in the field of industrial heating. The radiation pipe is widely used in various annealing furnaces. In the current reform of many gas vertical annealing furnaces, the number of gas radiation pipes that can be added is limited due to the load of the air and gas pipeline and the exhaust gas pipeline. The heating capacity cannot be improved too much, and the modification is large in cost and time, and is not environmentally friendly. Therefore, more electric heating radiation pipes are used.

[0003] However, the installation method of the electric heating radiation pipe is mainly in the form of supporting both ends. A small part is applied to small-span high-temperature heating sections, and only a few can be applied to large-span high-temperature heating sections. This is due to the limitation of material and structure. The strength of the conventional radiation pipe decreases in a high-temperature environment, which is prone to deformation and bending. Not only will it reduce the service life of the radiation pipe, but it will also be inconvenient to disassemble and assemble. At the same time, the electric heating pipe uses electric energy to control the heating element to heat. In order to adapt to the large-span high-temperature heating section, the power of the heating element needs to be higher, which increases the weight and size of the heating element, further increasing the load on the middle section of the radiation pipe in the large-span high-temperature heating section, causing the deformation probability of the radiation pipe to rise, affecting the radiation efficiency, and shortening the service life of the equipment. SUMMARY

[0004] The present application provides a radiation pipe and a heater, which to some extent improves the technical problem that the pipe body is suspended in the annealing furnace in the related art, and the middle section of the pipe structure is prone to bending and deformation due to the action of gravity.

[0005] In a first aspect, the embodiments of the present application provide a radiation pipe applied to a heater, wherein the heater has a heating cavity and a mounting port in communication with the heating cavity, and the radiation pipe comprises: a pipe body arranged in the mounting port; a heating element arranged in the pipe body; a first radiation assembly arranged along the length direction of the pipe body; two second radiation assemblies arranged in the pipe body, and the first radiation assembly and the second radiation assemblies are arranged in a cross manner; two pulling assemblies arranged in the pipe body in a spaced manner, and the first radiation plate is arranged between the two pulling assemblies; The two pulling assemblies are connected with the two second radiation assemblies respectively, and a pulling force is applied to the middle section of the pipe body to balance the bending moment of the pipe body caused by gravity.

[0006] In some embodiments, the pair of pulling assembly comprises a reinforcing seat and a pulling rod, the reinforcing seat is arranged on the pipe body, one end of the pulling rod is slidably connected with the reinforcing seat, and the other end of the pulling rod is connected with the second radiation assembly.

[0007] In some embodiments, the second radiation assembly comprises a second radiation plate and a fixing member, the second radiation plate is arranged cross the first radiation assembly, the pulling rod is arranged through the second radiation plate, the fixing member is connected with the pulling rod, and the fixing member abuts against the side of the second amplification plate away from the reinforcing seat.

[0008] In some embodiments, the second radiation plate is a plurality of, and the plurality of second radiation plates are arranged on the first radiation assembly along the length direction of the pipe body.

[0009] In some embodiments, the first radiation assembly comprises a plurality of first radiation plates and a plurality of clamping grooves, the plurality of first radiation plates are arranged on the outer wall of the pipe body, the plurality of first radiation plates are arranged along the length direction of the pipe body to form a plurality of clamping grooves, the second radiation plate has a clamping buckle, and the clamping buckle is clamped with the clamping groove.

[0010] In some embodiments, the radiation pipe further comprises a sealing structure arranged on the end of the pipe body close to the mounting port to seal the gap between the pipe body and the mounting port.

[0011] In some embodiments, the sealing structure comprises a plurality of inner lining plates and a filling layer. The plurality of inner lining plates are arranged on the end of the pipe body, and the filling layer is sleeved on the inner lining plate.

[0012] In a second aspect, the application provides a heater, which comprises a heater body, a first mounting assembly, a second mounting assembly and a radiation pipe according to any one of claims 1-7, the first mounting assembly is arranged on the mounting port, and the second mounting assembly is arranged on the wall of the heating cavity opposite to the mounting port. The pipe body is arranged through the first mounting assembly and overlaps with the second mounting assembly, and the first mounting assembly cooperates with the sealing structure to seal the heating cavity.

[0013] In some embodiments, the first mounting assembly comprises a bracket and a fixing ring sleeve. The bracket is arranged on the mounting port, the fixing ring sleeve is embedded in the bracket, and the filling layer is interference-fitted with the fixing ring sleeve to seal the mounting port. The fixing ring sleeve is transition-fitted with the second radiation plate and the reinforcing seat.

[0014] In some embodiments, the second mounting assembly includes a mounting plate and a support plate; The mounting plate is fitted into the wall of the heating cavity opposite to the mounting opening, and the support plate is connected to the mounting plate; The tube body has a guide head at one end corresponding to the second mounting assembly. The guide head cooperates with the support plate to support the end of the radiating tube near the mounting plate.

[0015] The beneficial effects of this application are as follows: The radiant tube extends along the length of the tube body through the first radiant component, and forms a radiant network with the cross arrangement of the second radiant components, thereby increasing the radiant area. By connecting the second radiant components at both ends of the tube body through the tensioning components, axial tension can be applied from both ends of the tube body towards the center, effectively counteracting the downward sag of gravity in the middle section, increasing the axial stiffness of the tube body and avoiding high-temperature deformation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first three-dimensional structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the exploded structure of Embodiment 1 of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention; Figure 5 This is a schematic cross-sectional view of the heater structure in Embodiment 3 of the present invention; In the diagram: 1. Mounting port; 2. Tube body; 3. Heating element; 4. First radiant assembly; 5. Second radiant assembly; 6. Pull-out assembly; 7. Sealing structure; 8. First mounting assembly; 9. Second mounting assembly; 41. First radiant plate; 42. Slot; 51. Second radiant plate; 52. Fixing element; 61. Reinforcing seat; 62. Tie rod; 71. Inner lining plate; 72. Filling layer; 81. Bracket; 82. Fixing ring; 91. Embedded plate; 92. Support plate. Detailed Implementation

[0017] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0018] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "two or more" include two or more than two.

[0019] In the application process of modern heating equipment such as annealing furnace, the radiant tube is an important component. In recent years, due to the energy efficiency advantage and environmental protection advantage of electric radiant tube, more and more radiant tubes take electric heating as the main heating form.

[0020] However, since the electric radiant tube takes the electric heating element 3 as the power unit, in order to improve the temperature in the furnace, a plurality of heating units are usually arranged in the electric radiant tube, which brings a weight problem to the heating tube. The problem is not obvious on some small annealing furnaces, but on medium and large annealing furnaces, due to the long length and large weight of the radiant tube, the middle part of the radiant tube is very easy to cause problems caused by gravity, which limits the service life of the radiant tube and makes it difficult to take out the furnace body after bending.

[0021] In view of this problem, please refer to the accompanying drawings Figures 1-5 The application discloses a radiant tube mainly applied to a heater. It should be noted that the heater referred to in the application can be an annealing furnace. The heater has a heating cavity, and one side wall surface of the heating cavity is provided with a mounting port 1. The radiant tube comprises a tube main body 2, a heating element 3, a first radiation assembly 4, a second radiation assembly 5 and two opposite pulling assemblies 6.

[0022] The tube main body 2 is arranged in the mounting port 1. The heating element 3 is arranged in the tube main body 2. The first radiation assembly 4 is arranged along the length direction of the tube main body 2. The two second radiation assemblies 5 are arranged in the tube main body 2, and the first radiation assembly 4 and the second radiation assembly 5 are arranged in a cross mode. The two opposite pulling assemblies 6 are arranged at intervals in the tube main body 2, and the first radiation plate 41 is arranged between the two opposite pulling assemblies 6. The two opposite pulling assemblies 6 are connected with the two second radiation assemblies 5 respectively, and a pulling force is applied to the middle section of the tube main body 2 to balance the bending moment of the tube main body 2 caused by gravity.

[0023] The pipe body 2 is an external support and mounting body of the radiation pipe, the heating elements 3 are uniformly distributed in the pipe body 2, which can effectively balance the gravity distribution of the pipe body 2, the first radiation assembly 4 is arranged along the length direction of the pipe body 2, thereby increasing the outward scattering area of the pipe body 2, meanwhile, the second radiation assembly 5 is arranged in cross with the first radiation assembly 4, so that the first radiation assembly 4 and the second radiation assembly 5 form an interlaced radiation network, which not only further increases the radiation area of the pipe body 2, but also, since the second radiation assembly 5 is detachably connected with the first radiation assembly 4, the counter-pulling assembly 6 pulls the second radiation assembly 5, the second radiation assembly 5 cooperates with the counter-pulling assembly 6, so that the counter-pulling assembly 6 applies a pulling force to the second radiation assembly 5 in the middle of the pipe body 2 from both ends of the pipe body 2, and since the second radiation assembly 5 is clamped on the pipe body 2, the center of the pipe body 2 is pulled to counteract the gravity.

[0024] In the application, the heating elements 3 are electric heating elements, the pipe body 2 is a main body structure made of composite material, the pipe body 2 can be a circular pipe structure, the first radiation assembly 4 can be integrally formed with the outer wall of the pipe body 2 to strengthen the rigidity of the pipe body 2 in the length direction, the second radiation assembly 5 is detachably connected with the first radiation assembly 4, the first radiation assembly 4 and the second radiation assembly 5 can be separated from each other, which facilitates disassembly and maintenance, and the second radiation assembly 5 can abut against the outer wall of the pipe body 2 to radiate the heat on the pipe body 2.

[0025] The radiation pipe extends along the length direction of the pipe body through the first radiation assembly 4, and forms a radiation network through the cross arrangement of the second radiation assembly 5, so as to increase the radiation area, and the counter-pulling assembly 6 connects the second radiation assembly at both ends of the pipe body to apply an axial pulling force to the center of the pipe body from both ends of the pipe body, which effectively counteracts the gravity sagging of the middle section, increases the axial rigidity of the pipe body, and avoids high-temperature deformation.

[0026] In some embodiments of the application, the counter-pulling assembly 6 includes a reinforcing seat 61 and a pulling rod 62, the reinforcing seat 61 is arranged on the pipe body 2, and the pulling rod 62 has a first end and a second end, wherein the first end is slidably connected with the reinforcing seat 61, and the second end is detachably connected with the second radiation assembly 5.

[0027] In the application, the reinforcing seat 61 and the pipe body 2 can be detachably connected to fix the pipe body 2, the pulling rod 62 is pulled by sliding adjustment of the first end of the pulling rod 62, so as to tighten the second radiation assembly 5 at the second end of the pulling rod 62, thereby providing a pulling force for the second radiation assembly 5, and the second radiation assembly 5 applies a pulling constraint to the middle section of the pipe body 2.

[0028] In some embodiments of the present application, the second radiation assembly 5 comprises a second radiation plate 51 and a fixing member 52, the second radiation plate 51 is detachably connected to the first radiation assembly 4, the pull rod 62 is arranged through the second radiation plate 51, and the fixing member 52 is detachably connected to the pull rod 62 and abuts against the second radiation plate 51 away from the side of the reinforcing seat 61.

[0029] In some embodiments of the present application, the second radiation assembly 5 comprises a second radiation plate 51 and a fixing member 52, the second radiation plate 51 is detachably connected to the first radiation assembly 4, the pull rod 62 is arranged through the second radiation plate 51, and the fixing member 52 is detachably connected to the pull rod 62 and abuts against the second radiation plate 51 away from the side of the reinforcing seat 61.

[0030] Specifically, the first end and the second end of the pull rod 62 can both adopt a threaded structure, and a threaded hole can be formed on the reinforcing seat 61 to threadedly cooperate with the first end of the pull rod 62, so as to achieve the sliding adjustment of the first end of the pull rod 62, and the fixing member 52 can be threadedly connected to the second end of the pull rod 62 by means of a nut, so as to abut and mount the second radiation plate 51.

[0031] In some embodiments of the present application, the first radiation assembly 4 comprises a plurality of first radiation plates 41, and the plurality of first radiation plates 41 are mounted to the outer wall of the pipe body 2. The plurality of first radiation plates 41 are arranged along the length direction of the pipe body 2, which can effectively increase the radiation area of the pipe body 2 and the rigidity of the pipe body 2, and the arrangement of the plurality of first radiation plates 41 can reduce the weight of the first radiation assembly 4.

[0032] In some embodiments of the present application, the first radiation assembly 4 further comprises a plurality of clamping grooves 42, and the plurality of radiation plates are arranged at intervals to form the plurality of clamping grooves 42. The second radiation plate 51 is provided with a clamping buckle, and the clamping buckle is clamped with the clamping groove 42.

[0033] In some embodiments of the present application, the plurality of clamping grooves 42 on the first radiation assembly 4 are formed by the plurality of radiation plates arranged at intervals, and the clamping groove 42 can be matched with the clamping buckle of the second radiation plate 51. Through the cooperation of the clamping buckle and the clamping groove 42, the second radiation assembly 5 can be conveniently positioned and mounted, so as to form the force point of the second radiation plate 51 to the first radiation plate 41, and the overall weight of the first radiation assembly 4 can be reduced, and the processing and material costs can be reduced.

[0034] In some embodiments of the present application, the radiation tube further comprises a sealing structure 7 arranged at the end of the tube body 2 close to the mounting port 1, which can be sealed with the mounting port 1 of the heater through the sealing structure 7, thereby improving the sealing performance and avoiding heat loss of the radiation tube.

[0035] In some embodiments of the present application, the sealing structure 7 comprises a plurality of inner lining plates 71 and a filling layer 72; the plurality of inner lining plates 71 are arranged at the end of the tube body 2 close to the mounting port 1 in a spaced manner, and the filling layer 72 is sleeved on the inner lining plates 71.

[0036] The filling layer 72 can be a fiber blanket, and the filling layer 72 is sleeved on the plurality of inner lining plates 71. Due to the spaced arrangement of the inner lining plates 71, the filling layer 72 is partially sunk into the space between the inner lining plates 71, and the sunken part of the filling layer 72 is partially spaced to form a plurality of disc-shaped protrusions. The plurality of disc-shaped protrusions form a plurality of sealing layers matched with the mounting port 1, effectively avoiding heat loss.

[0037] Based on the same inventive concept, please refer to the drawings in the description Figures 4-5 The present application also discloses a heater comprising a radiation tube mounting mechanism and the above-mentioned radiation tube. Specifically, the radiation tube mounting mechanism comprises opposite first and second mounting assemblies 8 and 9. The first mounting assembly 8 is arranged at the mounting port 1, and the second mounting assembly 9 is arranged at the wall surface of the heating cavity opposite to the mounting port 1. The tube body 2 is arranged through the first mounting assembly 8 and overlaps the second mounting assembly 9. The first mounting assembly 8 cooperates with the sealing structure 7 to seal the heating cavity.

[0038] The radiation tube mounting mechanism is arranged on the heater, i.e. the annealing furnace. The first mounting assembly 8 is arranged at the position of the mounting port 1, which is the entrance of the radiation tube mounting. The radiation tube is arranged through the first mounting assembly 8, and the second mounting assembly 9 is arranged at the corresponding side of the first mounting assembly 8. When the radiation tube is mounted in place, the end of the tube body 2 without the sealing mechanism overlaps the second mounting assembly 9 to form a supporting point. The sealing structure 7 on the tube body 2 is sealingly connected with the first mounting assembly 8 to seal the heating cavity and avoid heat loss of the radiation tube.

[0039] In some embodiments of the present application, the first mounting assembly 8 comprises a bracket 81 and a fixed ring sleeve 82. The bracket 81 is arranged at the mounting port 1, and the bracket 81 is provided with a through hole. The fixed ring sleeve 82 is embedded in the through hole, and the fixed ring sleeve 82 is in interference fit with the filling layer 72 to seal the mounting port 1. The inner diameter of the fixed ring sleeve 82 matches the diameter of the second radiation plate 51 and the reinforcing seat 61.

[0040] In the first mounting assembly 8, the support 81 is arranged in the mounting port 1 as a support base, and the fixing ring 82 can be a steel ring with densely arranged holes. The fixing ring 82 abuts against the inner wall of the support 81 and is in interference fit with the filling layer 72, so as to separate the heating cavity from the external environment and form a first supporting point for the radiant tube. In order to facilitate disassembly and assembly of the radiant tube, the second radiation plate 51 at the outermost side of the radiant tube and the reinforcing seat 61 can have the same inner dimension as the fixing ring 82. During installation, the second radiation plate 51 and the reinforcing seat 61 are in overfit with the fixing ring 82, and the limiting effect of the fixing ring 82 ensures smooth insertion of the radiant tube into the mounting port 1 during installation, while avoiding bumping of the tube body 2 and causing damage to the internal heating element 3.

[0041] In some embodiments of the present application, the second mounting assembly 9 includes an embedded plate 91 and a supporting plate 92. The embedded plate 91 is embedded in the wall of the heating cavity opposite the mounting port 1, and the supporting plate 92 is detachably connected to the embedded plate 91. The tube body 2 is provided with a guide head, and the guide head cooperates with the supporting plate 92 to support the end of the radiant tube close to the embedded plate 91.

[0042] In the second mounting assembly 9, the embedded plate 91 is the support base of the device, and stable support is achieved by embedding the embedded plate 91 into the inner wall of the heating cavity. The supporting plate 92 is detachably mounted on the embedded plate 91 to provide a mounting position for the guide head. Specifically, a groove matched with the guide head is arranged on the supporting plate 92, so that the guide head falls accurately on the supporting plate 92 to form a second supporting point for the radiant tube.

[0043] Next, the installation method of the radiant tube is introduced. Step S100: Pre-installation of the heating element. The electric heating element is uniformly arranged in the inner cavity of the composite tube body to ensure balanced gravity distribution. The tube body adopts a circular tube structure, and the outer wall is provided with a reserved clamping groove mounting position.

[0044] Step S200: Assembly of the second radiation assembly. The second radiation plate with buckles is clamped in the clamping groove of the first radiation assembly to form an interlaced radiation network.

[0045] Step S300: Installation of the pulling assembly. The pulling assembly is installed at both ends of the tube body to connect the second radiation plate.

[0046] Step S310: The reinforcing seat is installed on the tube body, and the first end of the pull rod is screwed into the threaded hole of the reinforcing seat.

[0047] Step S320: The second end is provided through the second radiation plate and is fixed by the fixing member. The pull rod is adjusted by sliding to exert a pulling force on the middle section of the tube body by the second radiation plate.

[0048] Step S400 sealing structure installation: the inner lining plate is arranged at the end of the pipe body near the installation port, and the fiber blanket filling layer is sleeved; the filling layer forms a dish-shaped protrusion due to the spacing of the inner lining plate, and constitutes a multi-layer sealing layer.

[0049] Step S500 installation mechanism docking: the pipe body is arranged in the fixing ring sleeve of the first installation assembly, and the guide head is overlapped on the groove of the supporting plate of the second installation assembly; the supporting plate is fixed to the wall surface of the heating cavity through the embedded plate, forming double support points, and the fixing ring sleeve and the filling layer are in interference fit to realize sealing.

[0050] As can be seen from the above, the radiation pipe and the heater have the following beneficial effects: 1) The radiation pipe extends along the length direction of the pipe body through the first radiation assembly, cooperates with the cross arrangement of the second radiation assembly to form a radiation network, so as to improve the radiation area; the second radiation assembly is connected at both ends of the pipe body through the pulling assembly, so as to apply axial tension from both ends of the pipe body to the center, effectively offset the sagging under the gravity of the middle section, so as to improve the axial stiffness of the pipe body and avoid high-temperature deformation.

[0051] 2) The heater adopts a double-end limiting structure to cooperate with the radiation pipe, the pipe body is arranged in the first installation assembly, and the second installation assembly adopts a supporting design, so as to facilitate quick guiding and positioning installation.

[0052] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0053] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0054] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0055] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A radiant tube for use in a heater, the heater having a heating chamber and a mounting port communicating with the heating chamber, characterized in that, The radiant tube includes: The main body of the pipe passes through the installation port; A heating element is disposed in the tube body; A first radiating component is disposed along the length direction of the tube body; Two second radiation components are disposed on the tube body, and the first radiation component and the second radiation component are arranged crosswise; Two counter-pull assemblies are spaced apart on the tube body, and the first radiating plate is disposed between the two counter-pull assemblies; Two counter-pull components are connected to two second radiating components respectively, applying traction force to the middle section of the tube body to balance the bending moment of the tube body caused by gravity.

2. A radiant tube according to claim 1, characterized in that, The pull assembly includes a reinforcing seat and a pull rod. The reinforcing seat is disposed on the tube body. One end of the pull rod is slidably connected to the reinforcing seat, and the other end of the pull rod is connected to the second radiating assembly.

3. A radiant tube according to claim 2, characterized in that, The second radiation component includes a second radiation plate and a fixing member. The second radiation plate is arranged crosswise with the first radiation component. The pull rod passes through the second radiation plate. The fixing member is connected to the pull rod and abuts against the side of the second amplification plate away from the reinforcing seat.

4. A radiant tube according to claim 3, characterized in that, There are multiple second radiating plates, and these multiple second radiating plates are installed at intervals along the length of the tube body on the first radiating assembly.

5. A radiant tube according to claim 4, characterized in that, The first radiation component includes a plurality of first radiation plates and a plurality of slots. The plurality of first radiation plates are installed on the outer wall of the tube body. The plurality of first radiation plates are spaced apart along the length of the tube body to form a plurality of slots. The second radiation plate has a buckle, and the buckle engages with the slot.

6. A radiant tube according to claim 1, characterized in that, The radiant tube also includes a sealing structure located at the end of the tube body near the mounting port to seal the gap between the tube body and the mounting port.

7. A radiant tube according to claim 6, characterized in that, The sealing structure includes multiple inner lining plates and a filling layer; Multiple inner lining plates are spaced apart at the ends of the pipe body, and the filling layer is sleeved on the inner lining plates.

8. A heater, characterized in that, The heater includes a heater body, a first mounting assembly, a second mounting assembly disposed opposite to each other, and a radiant tube as described in any one of claims 1-7, wherein the first mounting assembly is disposed at the mounting port, and the second mounting assembly is disposed on the wall surface of the heating chamber opposite to the mounting port; The tube body passes through the first mounting component and overlaps with the second mounting component. The first mounting component cooperates with the sealing structure to seal the heating chamber.

9. A heater according to claim 8, characterized in that, The first mounting assembly includes a bracket and a retaining ring; The bracket is disposed at the mounting port, the fixing ring is fitted into the bracket, and the filling layer is interference-fitted with the fixing ring to seal the mounting port; The fixing ring sleeve is in transition fit with the second radiating plate and the reinforcing seat.

10. A heater according to claim 9, characterized in that, The second mounting assembly includes a mounting plate and a support plate; The mounting plate is fitted into the wall of the heating cavity opposite to the mounting opening, and the support plate is connected to the mounting plate; The tube body has a guide head at one end corresponding to the second mounting assembly. The guide head cooperates with the support plate to support the end of the radiating tube near the mounting plate.

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