Sealing connecting piece of polycrystalline alumina fiber pipe and high-temperature furnace kiln

Abstract

The utility model provides a sealing connecting piece of a polycrystalline alumina fiber pipe and a high-temperature furnace kiln. The sealing connecting piece of the polycrystalline alumina fiber pipe comprises a male connector and a female connector, wherein the male connector comprises an external thread section, a limiting boss and a fiber pipe connecting section; the female joint comprises a sealing table, an internal thread section and a fiber pipe sleeve connecting section; the male connector and the female connector are connected in a screwed mode through the external threads and the internal threads, and it is guaranteed that the limiting boss is embedded into the sealing groove of the sealing table. The double-layer sealing structure between the limiting boss and the sealing groove comprises an inner-layer flexible sealing ring and an outer-layer elastic buffering ring. The gap between the sealing groove and the limiting boss is further filled with a double-layer sealing structure, and the microcosmic gap between the limiting boss and the sealing groove is filled and limited through cooperation of the inner-layer flexible sealing ring and the outer-layer elastic buffering ring so that a leakage channel can be blocked; the outer-layer elastic buffer ring compensates for gap changes caused by thermal expansion or vibration through elastic deformation of wave crests and wave troughs, long-term pre-tightening force is maintained, and double-insurance sealing is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of sealing connector of polycrystalline alumina fiber pipe and high-temperature furnace, belong to the pipeline connection technical field of high-temperature furnace. BACKGROUND

[0002] Polycrystalline alumina fiber pipe is widely used in high-temperature industrial equipment, such as high-temperature furnace, heat exchanger, etc. due to its high-temperature resistance, corrosion resistance and other characteristics, mainly used for transmitting high-temperature gas, high-temperature molten metal and other media. The connection structure of the fiber pipe needs to maintain long-term sealing in a high-temperature, high-vibration or thermal expansion environment to prevent medium leakage, so there is a high requirement for the stability of the connection structure. Since the fiber pipe itself has a certain brittleness, it is easy to break under stress concentration, therefore, a connector needs to be provided to complete the connection of the pipeline. The connector needs to consider sealing, reliability and structural compatibility. The single sealing structure of the traditional connector will cause the component to age and shorten the service life due to the attenuation of the high-temperature type elastic connection structure. Therefore, the existing fiber pipe sealing structure needs to be further improved and perfected. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a sealing connector of polycrystalline alumina fiber pipe and high-temperature furnace.

[0004] According to the embodiment of the utility model, the first scheme provides: a sealing connector of polycrystalline alumina fiber pipe, comprising a male connector and a female connector connected with each other, the male connector is connected with the end of fiber pipe A, and the female connector is connected with the end of fiber pipe B;

[0005] The male connector is a stepped shaft structure, which comprises an outer thread segment, a limiting boss and a fiber pipe connecting segment;

[0006] The female connector is a stepped cylinder structure, which comprises a sealing platform, an inner thread segment and a fiber pipe sleeve connecting segment;

[0007] The outer side of the outer thread segment of the male connector is provided with an outer thread, and the inner side of the inner thread segment of the female connector is provided with an inner thread matched with the outer thread. The male connector and the female connector are connected by the outer thread and the inner thread, and the limiting boss is embedded in the sealing groove of the sealing platform;

[0008] A double-layer sealing structure is arranged between the limiting boss and the sealing groove, which comprises an inner-layer flexible sealing ring and an outer-layer elastic buffer ring.

[0009] Further, the fiber pipe connecting segment of the male connector is connected with the outer wall or inner wall of fiber pipe A in interference fit, and the fiber pipe sleeve connecting segment of the female connector is connected with the outer wall or inner wall of fiber pipe B in interference fit.

[0010] Further, the limiting boss is an annular boss, the limiting boss is located between the outer thread segment and the fiber tube connecting segment, and the outer diameter of the limiting boss is greater than the outer diameter of the outer thread segment.

[0011] Further, the inner wall of the sealing platform is provided with a sealing groove, the sealing groove is an annular groove, and the inner diameter of the sealing groove is greater than the inner diameter of the inner thread.

[0012] Further, the inner layer flexible sealing ring is a high-temperature-resistant fiber felt pad body, and the high-temperature-resistant felt pad body is filled in the radial gap between the limiting boss and the sealing groove.

[0013] Further, the thickness of the high-temperature-resistant felt pad body is 0.5-2mm.

[0014] Further, the outer layer elastic buffer ring is a wave-shaped metal ring, the wave crest of the wave-shaped metal ring is in contact with the inner wall of the sealing groove, and the wave trough is in contact with the outer wall of the limiting boss.

[0015] Further, the wave-shaped metal ring is integrated with the inner layer flexible sealing ring, and the wave crest and the wave trough of the wave-shaped metal ring slightly protrude from the surface of the inner layer flexible sealing ring in the pressure-free state.

[0016] Further, the end of the inner thread segment of the female joint is provided with an annular limiting platform, the inner diameter of the annular limiting platform is less than the inner diameter of the sealing platform to limit the axial compression amount of the wave-shaped metal ring.

[0017] According to the embodiment of the utility model, the sealing connector of the polycrystalline alumina fiber tube in the first scheme provided by the utility model is used, and the second scheme is provided:

[0018] A high-temperature furnace kiln comprises the sealing connector of the polycrystalline alumina fiber tube of any one of the above.

[0019] Compared with the prior art, the technical scheme provided by the application has the beneficial effects of:

[0020] The male connector and the female connector of the sealing connector are additionally provided with the cooperation structure of the sealing groove and the limiting boss, the sealing property and the stability of the connection are further enhanced, in particular, the gap between the sealing groove and the limiting boss is filled with the double-layer sealing structure, the gap between the limiting boss and the sealing groove is filled and the leakage channel is blocked through the cooperation of the inner flexible sealing ring and the outer elastic buffer ring; the outer elastic buffer ring compensates the gap change caused by thermal expansion or vibration through the elastic deformation of the wave crest and the wave trough, maintains the long-term pre-tightening force, and forms the double-insurance sealing. The inner felt pad body is high-temperature resistant, and the outer metal ring is fatigue resistant, can adapt to high temperature of 1000-1600 DEG C and periodic thermal expansion and contraction, and prolongs the service life of the sealing element. The male connector and the female connector adopt the stepped shaft / tube structure, the fiber pipe is connected through interference fit, the connection strength is guaranteed, stress is dispersed, and the fiber pipe is prevented from being broken due to excessive local stress. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Among them:

[0023] Figure 1 It is a structural schematic view of the sealing connector of the polycrystalline alumina fiber pipe in an embodiment.

[0024] Figure 2 It is a partial schematic view of the double-layer sealing structure in an embodiment.

[0025] Figure 3 It is a structural schematic view of the locking ring outside the sealing platform of the female connector in an embodiment.

[0026] Reference signs:

[0027] 10-male connector, 11-outer threaded section, 111-outer thread, 12-limiting boss, 13-fiber pipe connecting section, 14-fiber pipe A, 20-female connector, 21-sealing platform, 212-locking sleeve, 213-locking element, 211-sealing groove, 22-inner threaded section, 221-inner thread, 23-fiber pipe sleeve connecting section, 24-fiber pipe B, 30-outer elastic buffer ring, 31-wave crest, 32-wave trough, 40-inner flexible sealing ring. DETAILED DESCRIPTION

[0028] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Embodiments

[0030] The technical problem solved by the present embodiment is that polycrystalline alumina fiber pipes are widely used in high-temperature industrial equipment such as high-temperature furnaces, heat exchangers, etc. due to their high-temperature resistance, corrosion resistance, etc. and are mainly used for transmitting high-temperature gas, high-temperature molten metal and other media. The connection structure of the fiber pipe needs to maintain long-term sealing in a high-temperature, high-vibration or thermal expansion environment to prevent medium leakage, so there is a very high requirement for the stability of the connection structure. Since the fiber pipe itself has a certain brittleness, it is easy to break under stress concentration, so a connecting piece needs to be provided to complete the connection of the pipeline. The connecting piece needs to consider sealing, reliability and structural adaptability. The single sealing structure of the traditional connecting piece will cause the components to age and shorten the service life due to the attenuation of the high-temperature type elastic connection structure.

[0031] To solve the above technical problems, as shown in Figure 1 The present embodiment provides a sealing connecting piece of a polycrystalline alumina fiber pipe, which comprises a male joint 10 and a female joint 20 connected with each other, the male joint 10 is connected with the end of a fiber pipe A 14, and the female joint 20 is connected with the end of a fiber pipe B 24.

[0032] The male joint 10 is a stepped shaft structure, and the male joint 10 comprises an outer thread segment 11, a limiting boss 12 and a fiber pipe connecting segment 13.

[0033] The female joint 20 is a stepped cylinder structure, and the female joint 20 comprises a sealing platform 21, an inner thread segment 22 and a fiber pipe sleeve connecting segment 23.

[0034] The outer side of the outer thread segment 11 of the male joint 10 is provided with an outer thread 111, the inner side of the inner thread segment 22 of the female joint 20 is provided with an inner thread 221 matched with the outer thread 111, and the male joint 10 and the female joint 20 are connected by screwing the outer thread 111 and the inner thread 221 and ensuring that the limiting boss 12 is embedded in the sealing groove 211 of the sealing platform 21.

[0035] A double-layer sealing structure is arranged between the limiting boss 12 and the sealing groove 211, and the double-layer sealing structure comprises an inner-layer flexible sealing ring 40 and an outer-layer elastic buffer ring 30.

[0036] Specifically, the fiber tube connecting section 13 of the male joint 10 is connected with the outer wall or inner wall of the fiber tube A 14 in an interference fit, and the fiber tube sleeve connecting section 23 of the female joint 20 is connected with the outer wall or inner wall of the fiber tube B 24 in an interference fit.

[0037] Specifically, the limiting boss 12 of the male joint 10 is an annular boss, which is located between the outer thread section 11 and the fiber tube connecting section 13, and the outer diameter of the limiting boss 12 is greater than the outer diameter of the outer thread section 11.

[0038] Specifically, the inner wall of the sealing platform 21 of the female joint 20 is provided with a sealing groove 211, which is an annular groove, and the inner diameter of the sealing groove 211 is greater than the inner diameter of the inner thread 221.

[0039] Specifically, the double-layer sealing structure includes an inner-layer flexible sealing ring 40 and an outer-layer elastic buffer ring 30.

[0040] The inner-layer flexible sealing ring 40 is a high-temperature-resistant fiber felt pad body, which is filled in the radial gap between the limiting boss 12 and the sealing groove 211. The thickness of the high-temperature-resistant felt pad body is 0.5-2mm. Specifically, polycrystalline alumina fiber that is resistant to high temperature and corrosion can be selected, which has a high-temperature resistance parameter of above 1600℃, and the fiber is interwoven to form a porous structure with a porosity of more than 60%. The flexible material of the polycrystalline alumina fiber can fit the small machining defects of the limiting boss 12 and the sealing groove 211, such as surface roughness and radial error, to block the leakage channels of gas and liquid. When the parts are unevenly expanded at high temperature, the elasticity of the fiber felt can absorb part of the deformation stress, avoiding structural damage caused by the collision of rigid structures.

[0041] The outer-layer elastic buffer ring is made of stainless steel or other alloy materials, which is resistant to high temperature of at least 800℃, has high elastic modulus and fatigue resistance. The outer-layer elastic buffer ring 30 is a wave-shaped metal ring, the wave crest 31 of which is in contact with the inner wall of the sealing groove 211, and the wave trough 32 is in contact with the outer wall of the limiting boss 12.

[0042] Specifically, the wave-shaped cross section can have a wave crest 31 height of 0.5-1mm and a wave distance of 2-3mm. The elastic deformation of the wave crest 31 and the wave trough 32 provides a pre-tightening force to compensate for the axial / radial displacement of the parts caused by vibration or thermal expansion and contraction.

[0043] The end of the inner thread section 22 of the female joint 20 is provided with an annular limiting platform, the inner diameter of which is smaller than the inner diameter of the sealing platform 21 to limit the axial compression amount of the wave-shaped metal ring. The outer layer left side is in contact with the annular limiting platform of the female joint 20 to limit excessive compression and avoid elastic failure.

[0044] As Figure 2As shown, the double-layer sealing structure can also be provided with the wave-shaped metal ring integrated with the inner layer flexible sealing ring 40, and the wave crest 31 and wave trough 32 of the wave-shaped metal ring slightly protrude from the surface of the inner layer flexible sealing ring 40 in the pressureless state. The integrated double-layer sealing structure has higher stability under pressure.

[0045] As shown, the double-layer sealing structure can also be provided with the wave-shaped metal ring integrated with the inner layer flexible sealing ring 40, and the wave crest 31 and wave trough 32 of the wave-shaped metal ring slightly protrude from the surface of the inner layer flexible sealing ring 40 in the pressureless state. The integrated double-layer sealing structure has higher stability under pressure. Figure 3 As shown, the double-layer sealing structure can also be provided with the wave-shaped metal ring integrated with the inner layer flexible sealing ring 40, and the wave crest 31 and wave trough 32 of the wave-shaped metal ring slightly protrude from the surface of the inner layer flexible sealing ring 40 in the pressureless state. The integrated double-layer sealing structure has higher stability under pressure.

[0046] The male connector 10 and the female connector 20 of the sealing connector are additionally provided with the sealing groove 211 and the limiting boss 12, which further enhances the sealing and stability of the connection. In particular, the gap between the sealing groove 211 and the limiting boss 12 is filled with the double-layer sealing structure, which fills the gap between the limiting boss 12 and the sealing groove 211 by the cooperation of the inner layer flexible sealing ring 40 and the outer layer elastic buffer ring 30, and blocks the leakage channel. The outer layer elastic buffer ring 30 compensates for the gap change caused by thermal expansion or vibration through the elastic deformation of the wave crest 31 and the wave trough 32, maintains long-term pre-tightening force, and forms a double-insurance seal. The inner layer felt pad body is resistant to high temperature, and the outer layer metal ring is resistant to fatigue, and can adapt to high temperature of 1000-1600℃ and periodic thermal expansion and contraction, thereby prolonging the service life of the sealing element. The male and female connectors 20 adopt a stepped shaft / tube structure, which connects the fiber pipe through interference fit, ensures the connection strength, disperses stress, and avoids the rupture of the fiber pipe due to excessive local stress.

[0047] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description. The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be considered as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the application, some modifications and improvements can be made, which are within the protection scope of the application.

[0048] It should be noted that when an element is referred to as being "fixed" or "set up" 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. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings shown in the figures, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly specified.

[0050] It should be understood that the structures, proportions, sizes and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the description, to enable those skilled in the art to understand and read, and do not have technical significance, and any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

Claims

1. A sealed connection of a polycrystalline alumina fiber tube, comprising a male joint and a female joint connected to each other, the male joint is connected to an end of a fiber tube A, and the female joint is connected to an end of a fiber tube B, characterized in that: the male joint is a stepped shaft structure, comprising an outer thread segment, a limiting boss and a fiber tube connecting segment; the female joint is a stepped cylinder structure, comprising a sealing platform, an inner thread segment and a fiber tube sleeve connecting segment; an outer thread is arranged on the outer side of the outer thread segment of the male joint, and an inner thread matched with the outer thread is arranged on the inner side of the inner thread segment of the female joint, the male joint and the female joint are connected by screwing the outer thread and the inner thread, and the limiting boss is embedded in the sealing groove of the sealing platform; a double-layer sealing structure is arranged between the limiting boss and the sealing groove, the double-layer sealing structure comprises an inner layer flexible sealing ring and an outer layer elastic buffer ring.

2. The sealed connection of a polycrystalline alumina fiber tube according to claim 1, wherein the fiber tube connecting segment of the male joint is connected to the outer wall or the inner wall of the fiber tube A by interference fit, and the fiber tube sleeve connecting segment of the female joint is connected to the outer wall or the inner wall of the fiber tube B by interference fit.

3. The sealed connection of a polycrystalline alumina fiber tube according to claim 1, wherein the limiting boss is an annular boss, which is located between the outer thread segment and the fiber tube connecting segment, and the outer diameter of the limiting boss is larger than the outer diameter of the outer thread segment.

4. The sealed connection for a polycrystalline alumina fiber tube of claim 1, wherein, the inner wall of the sealing platform is provided with a sealing groove, which is an annular groove, and the inner diameter of the sealing groove is larger than the inner diameter of the inner thread.

5. The sealed connection for a polycrystalline alumina fiber tube of claim 1, wherein, the inner layer flexible sealing ring is a high-temperature-resistant fiber felt pad body, which is filled in the radial gap between the limiting boss and the sealing groove.

6. The sealed connection of a polycrystalline alumina fiber tube according to claim 5, wherein the thickness of the high-temperature-resistant fiber felt pad body is 0.5-2mm.

7. The sealed connection of a polycrystalline alumina fiber tube of claim 1, wherein the outer layer elastic buffer ring is a wave-shaped metal ring, the wave crest of the wave-shaped metal ring is in contact with the inner wall of the sealing groove, and the wave trough is in contact with the outer wall of the limiting boss.

8. The sealed connection of a polycrystalline alumina fiber tube according to claim 7, wherein the wave-shaped metal ring is integrated with the inner layer flexible sealing ring, and the wave crest and the wave trough of the wave-shaped metal ring slightly protrude from the surface of the inner layer flexible sealing ring in the state of no pressure.

9. The sealed connection of a polycrystalline alumina fiber tube according to claim 8, wherein the end of the inner thread segment of the female joint is provided with an annular limiting platform, and the inner diameter of the annular limiting platform is smaller than the inner diameter of the sealing platform to limit the axial compression amount of the wave-shaped metal ring.

10. A high temperature furnace, characterized by, a sealed connection of a polycrystalline alumina fiber tube as claimed in any one of claims 1-9.

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