Sealing structure and kiln

Abstract

The utility model provides a sealing structure and a kiln, the sealing structure is installed on a furnace body, the furnace body is provided with a pipe body, and the pipe body penetrates through the furnace wall of the furnace body; the sealing structure comprises a rigid connecting pipe and a flexible connecting pipe, at least one end of the pipe body is sleeved with the rigid connecting pipe, and the first end of the rigid connecting pipe is connected with the furnace body; the rigid connecting pipe is sleeved with the flexible connecting pipe, one end of the flexible connecting pipe is in sealed connection with the pipe body, and the other end of the flexible connecting pipe is in sealed connection with the second end of the rigid connecting pipe. In the application, certain pre-tightening force can be generated by utilizing the elasticity of the flexible connecting pipe, so that the flexible connecting pipe is more tightly connected with the pipe body and the rigid connecting pipe, the sealing performance is improved, the subsequent overhaul and disassembly of the quartz pipe are facilitated, sintering flue gas in a sintering temperature area in a furnace body can be effectively prevented from leaking into the quartz pipe body, and the service life of the furnace body is prolonged. Interference of sintering flue gas on electrical elements in the quartz tube body is avoided, stable operation of the electrical elements is facilitated, and the service life of the electrical elements is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of kilns, and more specifically, relates to a sealing structure and a kiln. Background Art

[0002] The electric heating roller hearth kiln is a type of kiln. As a firing equipment for high-temperature sintering of materials, certain sintering flue gas will be generated during the high-temperature sintering of materials in the roller hearth kiln. To avoid the contact between the heating element and the sintering flue gas, which may affect the stability of the heating element and thus the temperature uniformity inside the kiln, the heating element part needs to be protected by quartz tubes to prevent the heating element from being damaged by contact with the sintering flue gas.

[0003] Since the heating element needs to be installed inside the quartz tube and the temperature inside the furnace is relatively high, it is difficult to seal both ends of the quartz tube. Currently, for the sealing of the end caps of the quartz tubes inside the roller hearth kiln, the main methods are: (1) filling with heat-insulating needle felt for sealing and (2) using ceramic end caps for filling and sealing with high-temperature mortar.

[0004] Currently, neither of these two sealing methods can effectively block the sintering flue gas inside the kiln from entering the terminal chamber and the inside of the quartz tube. Moreover, it is inconvenient to check and disassemble the quartz tube after the sealing installation. The heating elements inside the terminal chamber and the quartz tube of the roller hearth kiln will be affected by the sintering flue gas inside the kiln. Influencing factors such as damage to the heating element, poor temperature uniformity inside the kiln, and high failure rate of the heating element are all related to the leaked sintering flue gas. Summary of the Utility Model

[0005] The purpose of the embodiments of this application is to provide a sealing structure and a kiln to solve the technical problem of the leakage of sintering flue gas inside the kiln into the tube body of the quartz tube existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted in this application is: to provide a sealing structure, which is installed on the furnace body. A tube body is provided on the furnace body, and the tube body penetrates through the furnace wall of the furnace body; the sealing structure includes a rigid connecting tube and a flexible connecting tube. The rigid connecting tube is sleeved on at least one end of the tube body, and the first end of the rigid connecting tube is connected to the furnace body; the flexible connecting tube is sleeved on the rigid connecting tube, the first end of the flexible connecting tube is hermetically connected to the second end of the rigid connecting tube, and the second end of the flexible connecting tube is hermetically connected to the tube body.

[0007] Optionally, the sealing structure further includes a first hoop, which is sleeved on the second end of the flexible connecting tube, and the first hoop is used to tighten the flexible connecting tube and the tube body.

[0008] Optionally, the sealing structure further includes a second hoop, which is sleeved on the first end of the flexible connecting pipe, and the second hoop is used to tighten the flexible connecting pipe and the rigid connecting pipe.

[0009] Optionally, the inner diameter of the second end of the flexible connecting pipe is smaller than the inner diameter of the first end of the flexible connecting pipe.

[0010] Optionally, the flexible connecting pipe is a heat-resistant and acid-resistant hose.

[0011] Optionally, a stepped groove is provided at the first end of the rigid connecting pipe, and the stepped groove is embedded in the furnace body and is hermetically connected to the furnace body.

[0012] Optionally, the rigid connecting pipe is a metal pipe, and the rigid connecting pipe is fixedly connected to the furnace body.

[0013] The present application also provides a kiln, including a furnace body, a terminal chamber, a pipe body, a heating element, and the above-mentioned sealing structure; a reserved hole is provided on the furnace body; the terminal chamber is arranged on the furnace wall of the furnace body; the pipe body passes through the reserved hole and extends into the terminal chamber; the heating element is arranged in the pipe body; the first end of the rigid connecting pipe is connected to the furnace body at the reserved hole.

[0014] Optionally, the kiln further includes a heat-insulating layer, which is arranged in the gap between the reserved hole and the pipe body.

[0015] Optionally, the kiln further includes a support pipe and a positioning cover. The positioning cover is connected to one end of the pipe body facing the terminal chamber. The support pipe is arranged in the pipe body. One end of the support pipe passes through the positioning cover and is hermetically connected to the positioning cover; the connecting cable of the heating element is arranged in the support pipe.

[0016] The beneficial effects of the sealing structure and the kiln provided by the present application are as follows: Compared with the prior art, in the present application, a rigid connecting pipe and a flexible connecting pipe are provided at at least one end of the quartz tube body. Utilizing the elasticity of the flexible connecting pipe itself, a certain pre-tightening force can be generated, making the flexible connecting pipe more tightly connected to the tube body and the rigid connecting pipe, improving the sealing performance, and also facilitating subsequent maintenance and disassembly of the quartz tube; adopting this sealing structure can effectively prevent the sintering flue gas in the sintering temperature zone of the furnace body from leaking into the quartz tube body, avoiding the interference of the sintering flue gas on the electrical components, especially the heating element, in the quartz tube body, being beneficial to the stable operation of the electrical components, and prolonging the service life of the electrical components. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the kiln furnace provided by the embodiment of the present application;

[0019] Figure 2 It is Figure 1 the enlarged schematic view of part A in

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the rigid connecting pipe in the sealing structure provided by the embodiment of the present application;

[0021] Figure 4 It is a schematic cross-sectional structure diagram of the flexible connecting pipe in the sealing structure provided by the embodiment of the present application;

[0022] Among them, the reference numerals in the drawings are as follows:

[0023] 100 - terminal chamber; 101 - terminal cover plate; 102 - connecting cable;

[0024] 200 - pipe body;

[0025] 300 - furnace body; 301 - furnace wall;

[0026] 400 - rigid connecting pipe; 401 - stepped groove;

[0027] 500 - flexible connecting pipe;

[0028] 601 - first hoop; 602 - second hoop;

[0029] 700 - heat insulation layer;

[0030] 800 - support pipe;

[0031] 900 - positioning cover. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the following further details the present application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0036] Please refer to Figure 1 and Figure 2 for a description of the sealing structure provided by the embodiments of the present application. This sealing structure is installed on the furnace body 300. There is a pipe body 200 on the furnace body 300. The pipe body 200 is a quartz tube. A heating element is arranged inside the quartz tube. The pipe body 200 penetrates through the furnace wall 301 of the furnace body 300. The sealing structure includes a rigid connecting pipe 400 and a flexible connecting pipe 500. The rigid connecting pipe 400 is sleeved on the pipe body 200, and the first end of the rigid connecting pipe 400 is connected to the furnace body 300. The flexible connecting pipe 500 is sleeved on the rigid connecting pipe 400. The first end of the flexible connecting pipe 500 is hermetically connected to the second end of the rigid connecting pipe 400, and the second end of the flexible connecting pipe 500 is hermetically connected to the pipe body 200.

[0037] Compared with the prior art, in the embodiments of the present application, the sealing structure provided has a rigid connecting pipe 400 and a flexible connecting pipe 500. Utilizing the elasticity of the flexible connecting pipe 500 itself, a certain pre-tightening force can be generated, making the connection between the flexible connecting pipe 500 and the pipe body 200 and the rigid connecting pipe 400 tighter, improving the sealing performance, and also facilitating subsequent maintenance and disassembly of the quartz tube. Adopting this sealing structure can effectively prevent the sintering flue gas in the sintering temperature zone of the furnace body 300 from leaking into the quartz tube body, avoiding the interference of the sintering flue gas on the electrical components, especially the heating element, inside the quartz tube body.

[0038] Specifically, the outer wall of the first end of the rigid connecting pipe 400 is connected to the furnace body 300; the flexible connecting pipe 500 is sleeved on the rigid connecting pipe 400, the inner wall of the second end of the flexible connecting pipe 500 is hermetically connected to the outer wall of the pipe body 200, and the inner wall of the first end of the flexible connecting pipe 500 is hermetically connected to the outer wall of the second end of the rigid connecting pipe 400.

[0039] In this embodiment, as Figure 1 shown, the right end of the rigid connecting pipe 400 is the first end of the rigid connecting pipe 400, and the left end of the rigid connecting pipe 400 is the second end of the rigid connecting pipe 400; the right end of the flexible connecting pipe 500 is the first end of the flexible connecting pipe 500, and the left end of the flexible connecting pipe 500 is the second end of the flexible connecting pipe 500.

[0040] In this embodiment, the rigid connecting pipe 400 refers to a pipe that is not easily bent. It has high strength and stiffness and can withstand large pressures without deformation. The flexible connecting pipe 500 is a pipe with high flexibility. It has a certain elasticity and can withstand bending without being easily broken.

[0041] In an embodiment of the present application, please refer to Figure 1 and Figure 2 together. The sealing structure further includes a first hoop 601. The first hoop 601 is sleeved on the second end of the flexible connecting pipe 500, and the first hoop 601 is used to tighten the flexible connecting pipe 500 and the pipe body 200.

[0042] In this embodiment, by providing the first hoop 601, the sealing effect between the flexible connecting pipe 500 and the pipe body 200 can be further ensured, and leakage can be prevented under high temperature and pressure changes. Specifically, the first hoop 601 is sleeved on the outer wall of the second end of the flexible connecting pipe 500.

[0043] In an embodiment of the present application, please refer to Figure 1 and Figure 2 together. The sealing structure further includes a second hoop 602. The second hoop 602 is sleeved on the first end of the flexible connecting pipe 500, and the second hoop 602 is used to tighten the flexible connecting pipe 500 and the rigid connecting pipe 400.

[0044] In this embodiment, by providing the second hoop 602, the sealing effect between the flexible connecting pipe 500 and the rigid connecting pipe 400 can be further ensured, and leakage can be prevented under high temperature and pressure changes. Specifically, the second hoop 602 is sleeved on the outer wall of the first end of the flexible connecting pipe 500; both the first hoop 601 and the second hoop 602 can be made of stainless steel material.

[0045] In this embodiment, the tube body 200 can be made of quartz tube, which has excellent high temperature resistance, corrosion resistance and high transparency characteristics. The furnace body 300 can be an electrically heated roller hearth kiln.

[0046] In one embodiment of the present application, please refer to Figure 1 and Figure 4 , the inner diameter of the second end of the flexible connecting tube 500 is smaller than the inner diameter of the first end of the flexible connecting tube 500.

[0047] In this embodiment, the inner diameter of the second end of the flexible connecting tube 500 is smaller than the inner diameter of the first end of the flexible connecting tube 500, which can make the tube body 200 located inside the rigid connecting tube 400, facilitating the assembly of the overall structure.

[0048] In one embodiment of the present application, the flexible connecting tube 500 is a high temperature and acid corrosion resistant hose.

[0049] Specifically, the material of the flexible connecting tube 500 can be silicone rubber, which has excellent high temperature resistance and chemical corrosion resistance and is suitable for use in the environment of the high temperature furnace body 300. In addition, silicone rubber has good flexibility and can adapt to the thermal expansion and contraction generated during the operation of the furnace body 300, thus maintaining a good sealing effect.

[0050] In one embodiment of the present application, please refer to Figure 3 , a stepped groove 401 is provided at the first end of the rigid connecting tube 400, and the stepped groove 401 is embedded in the furnace body 300 and is hermetically connected to the furnace body 300.

[0051] In this embodiment, by providing a stepped groove 401 at the first end of the rigid connecting tube 400 and embedding it in the furnace body 300, the sealing performance can be further improved, ensuring that there is no leakage at the connection between the rigid connecting tube 400 and the furnace body 300 under high temperature and pressure changes. The structure of the stepped groove 401 makes the seal between the rigid connecting tube 400 and the furnace body 300 more reliable. At the same time, the stepped groove 401 can also play a certain supporting and positioning role, enhancing the stability of the rigid connecting tube 400.

[0052] In another embodiment of the present application, a plurality of annular protrusions (not shown) are provided on the outer wall of the rigid connecting tube 400. These annular protrusions can increase the friction force between the flexible connecting tube 500 and the rigid connecting tube 400, thereby further improving the sealing effect under the action of the pre-tightening force. The annular protrusions can also prevent the flexible connecting tube 500 from expanding excessively at high temperature to a certain extent and maintain its shape stability.

[0053] In yet another embodiment of the present application, a plurality of annular grooves (not shown) are provided on the inner wall of the flexible connecting pipe 500. These annular grooves can cooperate with the annular protrusions on the rigid connecting pipe 400 to increase the frictional force between the two, thereby further improving the sealing effect under the action of the pre-tightening force. The annular grooves can also absorb the expansion stress generated by the flexible connecting pipe 500 at high temperatures to a certain extent and maintain its shape stability.

[0054] In one embodiment of the present application, the rigid connecting pipe 400 is a metal pipe, and the rigid connecting pipe 400 is fixedly connected to the furnace body 300.

[0055] Specifically, the furnace wall 301 of the furnace body 300 is a metal structure, and the rigid connecting pipe 400 is welded to the furnace wall 301 of the furnace body 300.

[0056] In this embodiment, the rigid connecting pipe 400 is welded to the furnace wall 301 of the furnace body 300, which can further improve the sealing performance. The rigid connecting pipe 400 and the furnace body 300 can adopt a full-weld welding method.

[0057] Specifically, the material of the rigid connecting pipe 400 can be stainless steel (the grade of stainless steel can be 304). Stainless steel has good mechanical strength and corrosion resistance, can withstand the high temperature and chemical corrosion environment inside the furnace body 300, and ensure the stability and sealing performance of the connecting pipe.

[0058] The embodiment of the present application also provides a kiln, including a furnace body 300, a terminal chamber 100, a pipe body 200, a heating element, and the above-mentioned sealing structure; a reserved hole is provided on the furnace body 300; the terminal chamber 100 is arranged on the furnace wall 301 of the furnace body 300; the pipe body 200 passes through the reserved hole and extends into the terminal chamber 100; the heating element is arranged inside the pipe body 200; the first end of the rigid connecting pipe 400 is connected to the furnace body 300 at the reserved hole.

[0059] Compared with the prior art, in the embodiment of the present application, a sealing structure is provided, which improves the sealing performance of the kiln, is also convenient for subsequent maintenance and disassembly of the quartz tube, can effectively prevent the sintering flue gas in the sintering temperature zone inside the furnace body 300 from leaking into the quartz tube body, greatly improves the atmosphere environment inside the quartz tube body 200, avoids the interference of the sintering flue gas to the heating element, is beneficial to the stable operation of the heating element, and prolongs the service life of the heating element.

[0060] Specifically, the stepped groove 401 of the rigid connecting pipe 400 is hermetically connected to the inner wall of the reserved hole, and the structure of the stepped groove 401 makes the seal between the rigid connecting pipe 400 and the reserved hole of the furnace body 300 more reliable.

[0061] In one embodiment of the present application, please refer to Figure 1, the kiln further includes a thermal insulation layer 700 which is arranged in the gap between the inner wall of the reserved hole and the outer wall of the pipe body 200.

[0062] Specifically, the material of the thermal insulation layer 700 can be a high-temperature resistant ceramic fiber material which has good heat insulation performance, can effectively reduce the heat dissipation in the furnace body 300, and at the same time reduce the influence of the external environment on the temperature in the furnace body 300. The existence of the thermal insulation layer 700 not only improves the thermal efficiency of the furnace body 300, but also further protects the sealing structure and avoids thermal stress damage caused by drastic temperature changes.

[0063] In an embodiment of the present application, a maintenance opening is provided on the side wall of the terminal post chamber 100; please refer to Figure 1 , at the maintenance opening, a terminal post cover plate 101 is detachably connected to the side wall of the terminal post chamber 100.

[0064] In this embodiment, the design of the maintenance opening makes the maintenance and repair of the terminal post chamber 100 more convenient. The terminal post cover plate 101 can adopt a sealing material matching the side wall of the terminal post chamber 100 to ensure that the sealing performance in the chamber will not be affected during disassembly and installation. In addition, the structural design of the terminal post cover plate 101 can facilitate the operators to carry out daily inspection and maintenance work, thereby improving the reliability and safety of the entire furnace body 300 system.

[0065] In an embodiment of the present application, an observation window (not shown) is provided on the terminal post cover plate 101, and the observation window can be made of a high-temperature resistant transparent material such as quartz glass. The existence of the observation window enables the operators to observe the conditions in the chamber without opening the terminal post cover plate 101, so as to conduct real-time monitoring without affecting the operation of the furnace body 300.

[0066] In an embodiment of the present application, the connection mode between the terminal post cover plate 101 and the side wall of the terminal post chamber 100 is a threaded connection. The threaded connection has good sealing performance and is convenient for disassembly and installation, making the replacement and maintenance of the terminal post cover plate 101 more convenient.

[0067] In an embodiment of the present application, please refer to Figure 1 , the kiln further includes a support pipe 800 and a positioning cover 900. The positioning cover 900 is connected to one end of the pipe body 200 facing the terminal post chamber 100. The support pipe 800 is arranged in the pipe body 200, one end of the support pipe 800 passes through the positioning cover 900 and is hermetically connected to the positioning cover 900; the connection cable 102 of the heating element is arranged in the support pipe 800.

[0068] In an embodiment of the present application, the material of the support tube 800 can be a high-temperature resistant ceramic material, which has good insulation performance and heat resistance, can withstand the high-temperature environment in the furnace body 300, and ensure the safe operation of the connection cable 102. In addition, the inner diameter of the support tube 800 is designed to be slightly larger than the connection cable 102 of the heating element to facilitate the installation and maintenance of the cable.

[0069] In an embodiment of the present application, the positioning cover 900 is designed with a detachable structure to facilitate the inspection and replacement of the support tube 800 and the connection cable 102 when needed. The connection method between the positioning cover 900 and the tube body 200 can be a threaded connection to ensure the tightness and sealing of the connection. At the same time, a sealing ring is provided on the positioning cover 900 to further improve the sealing effect and prevent the leakage of high-temperature gas in the furnace body 300.

[0070] The sealing structure and the kiln furnace provided by the embodiments of the present application have significant improvements in the following aspects by setting the rigid connection tube 400 and the flexible connection tube 500:

[0071] (1) Equipment: Avoid the accumulation of sintering flue gas in the terminal chamber 100 and the quartz tube body 200, extend the service life of the heating element, reduce the failure rate of the heating element, and at the same time facilitate the subsequent maintenance and disassembly of the quartz tube;

[0072] (2) Production: Reduce the production capacity loss caused by the shutdown for maintenance due to the damage of the heating element, reduce the leakage of flue gas in the furnace caused by the disassembly of the terminal cover 101 during the maintenance of the heating element, and improve the working environment of the workshop;

[0073] (3) Quality: Reduce the disassembly frequency of the terminal cover 101 and reduce the risk of oxidation of the oxygen inlet material in the furnace caused by the disassembly of the terminal cover 101;

[0074] (4) Process: Reduce the temperature difference in the temperature zone of the furnace body 300, improve the temperature stability of the temperature zone, and improve the product performance.

[0075] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing structure is installed on a furnace body, and a pipe body is provided on the furnace body, and the pipe body penetrates through the furnace wall of the furnace body; characterized in that, The sealing structure includes: A rigid connecting pipe, which is sleeved at least at one end of the pipe body, and the first end of the rigid connecting pipe is connected to the furnace body; A flexible connecting pipe, which is sleeved on the rigid connecting pipe, the first end of the flexible connecting pipe is hermetically connected to the second end of the rigid connecting pipe, and the second end of the flexible connecting pipe is hermetically connected to the pipe body.

2. The sealing structure according to claim 1, characterized in that, The sealing structure further includes a first clamp, which is sleeved at the second end of the flexible connecting pipe, and the first clamp is used to tighten the flexible connecting pipe and the pipe body.

3. The sealing structure according to claim 2, characterized in that, The sealing structure further includes a second clamp, which is sleeved at the first end of the flexible connecting pipe, and the second clamp is used to tighten the flexible connecting pipe and the rigid connecting pipe.

4. The sealing structure according to claim 1, wherein, The inner diameter of the second end of the flexible connecting pipe is smaller than the inner diameter of the first end of the flexible connecting pipe.

5. The sealing structure according to claim 1, wherein The flexible connecting pipe is a heat-resistant and acid-corrosion-resistant hose.

6. The sealing structure according to claim 1, characterized in that, The first end of the rigid connecting pipe is provided with a stepped groove, and the stepped groove is embedded in the furnace body and hermetically connected to the furnace body.

7. The sealing structure according to claim 1, characterized in that, The rigid connecting pipe is a metal pipe, and the rigid connecting pipe is fixedly connected to the furnace body.

8. A kiln, characterized in that, Comprising: A furnace body, which is provided with a reserved hole; A terminal chamber, which is arranged on the furnace wall of the furnace body, A pipe body, which passes through the reserved hole and extends into the terminal chamber; A heating element, which is arranged in the pipe body; The sealing structure according to any one of claims 1-7, wherein the first end of the rigid connecting pipe is connected to the furnace body at the reserved hole.

9. The kiln according to claim 8, characterized in that, The kiln further includes a heat-insulating layer, which is arranged in the gap between the reserved hole and the pipe body.

10. The kiln according to claim 8 or 9, characterized in that, The kiln further includes a support pipe and a positioning cover. The positioning cover is connected to one end of the pipe body facing the terminal chamber. The support pipe is arranged in the pipe body. One end of the support pipe passes through the positioning cover and is hermetically connected to the positioning cover; the connecting cable of the heating element is arranged in the support pipe.

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