Double-sealing structure for large flange of nitric acid oxidation furnace equipment

Abstract

The utility model provides a double-seal structure for a large flange of nitric acid oxidation furnace equipment, which comprises an upper cylinder and a lower cylinder, an upper flange is arranged at one end of the upper cylinder facing the lower cylinder, and a lower flange matched with the upper flange is arranged on the lower cylinder; the end, facing the lower flange, of the upper flange is provided with an upper bushing ring, the lower flange is provided with a lower bushing ring matched with the upper bushing ring, the upper bushing ring is provided with a first protruding part and a second protruding part at intervals, the first protruding part and the second protruding part are each of an annular structure, and the first protruding part and the second protruding part are coaxial with the upper bushing ring; an isolation gap exists between the two; sealing grooves are formed in the positions, corresponding to the first protruding part and the second protruding part, of the lower lining ring, and sealing gaskets matched with the first protruding part and the second protruding part are arranged in the sealing grooves. The double-sealing structure for the large flange of the nitric acid oxidation furnace equipment has the advantages of being good in sealing effect, easy to assemble and use and high in safety and reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flange sealing structure technical field, especially, it is a kind of double sealing structure for big flange of nitric acid oxidation furnace equipment. BACKGROUND

[0002] Flange is also called flange flange or lug, flange is the part of mutual connection between shaft and shaft, is used to the connection between pipe end;Also used on the flange of equipment inlet and outlet, is used to the connection between two equipment, such as speed reducer flange, lining ring flange makes one of flange. At present in the nitric acid production technical field, nitric acid oxidation furnace is one of main equipment, usually for overhauling, equipment big flange is set in the middle of cylinder, usually big flane adopts single groove sealing form, and sealing pad is high-temperature-resistant ceramic fiber belt.

[0003] The existing application number for 202222042396.9 Chinese utility model patent discloses a kind of big-caliber lining ring flange, including first flange piece, second flange piece, liquid inlet pipe and liquid outlet pipe, the first flange piece side is equipped with input hole and input hole is welded with insertion ring on the periphery, the periphery of insertion ring is adhered with elastic sealing ring by polyurethane waterproof glue, the first flange piece side is clamped with second flange piece, the second flange piece side is equipped with output hole and output hole is provided with annular insertion slot on the outside. But existing flange sealing still adopts single sealing ring form, still exist the defect of not strict sealing, there is the risk of ammonia gas leakage through flange in the process of nitric acid production use, production and production environment are influenced. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a kind of double sealing structure for big flange of nitric acid oxidation furnace equipment to solve the problem that existing single sealing ring form flange is applied to nitric acid production, there is the risk of ammonia gas leakage through flange, influences production and production environment.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a big flange of nitric acid oxidation furnace equipment double seal structure, including upper cylinder and lower cylinder, the one end of upper cylinder is equipped with upper flange to lower cylinder, and the lower cylinder is equipped with the lower flan with upper flange cooperation, the one end of upper flange is equipped with upper lining ring to lower flange, and the lower flan is equipped with lower lining ring with upper lining ring cooperation, the first protruding portion and the second protruding portion are equipped with interval on the upper lining ring, the first protruding portion and the second protruding portion are annular structure, and the first protruding portion and the second protruding portion are coaxial with upper lining ring, and there is isolation gap between the two, the position of lower lining ring is equipped with sealing groove with the first protruding portion and the second protruding portion, and the sealing pad with the first protruding portion and the second protruding portion cooperation is equipped in sealing groove, the position of lower lining ring is equipped with the air hole with the isolation gap intercommunication between the first protruding portion and the second protruding portion, and the through -hole with the air hole intercommunication is equipped on the lower flan.

[0007] Further, the width of the sealing pad is greater than the width of the corresponding first protruding portion or second protruding portion.

[0008] Further, the lower flange is provided with a control valve at a position corresponding to the through hole.

[0009] Further, the control valve is a pressure relief valve.

[0010] Further, the sealing pad is made of temperature-resistant ceramic fiber.

[0011] Further, the first protruding portion and the second protruding portion are provided with a sealing assembly at one end extending into the sealing groove.

[0012] Further, the sealing assembly includes a sealing ring, and the first protruding portion and the second protruding portion are provided with a fitting groove for accommodating the sealing ring.

[0013] Further, the first protruding portion and the second protruding portion are provided with a gas guide hole on one side facing the isolation gap, and the isolation gap is in communication with the fitting groove through the gas guide hole.

[0014] Further, the cross section of the sealing ring is U-shaped, and the slot of the sealing ring is in communication with the gas guide hole through the fitting groove.

[0015] Compared with the prior art, the big flange of nitric acid oxidation furnace equipment double seal structure has the following advantages:

[0016] (1) The big flange of nitric acid oxidation furnace equipment double seal structure has the advantages of good sealing effect, easy assembly and use, high safety and reliability, and can be used for sealing the big flange of nitric acid oxidation furnace equipment, which is conducive to reducing the risk of ammonia gas leakage through the flange and ensuring the safety of production and production environment.

[0017] (2) The double sealing structure for the large flange of the nitric acid oxidation furnace equipment, through the first protruding part and the second protruding part, the first protruding part and the second protruding part are inserted into the sealing groove and tightly adhere to the sealing pad, not only a double sealing structure can be formed, but also a structure similar to a stepped labyrinth seal can be formed by the first protruding part or the second protruding part cooperating with the sealing groove, the effect of double-stage sealing is realized, the flow length of the airflow is prolonged, and better sealing effect is achieved, and ammonia gas leakage is prevented.

[0018] (3) The double sealing structure for the large flange of the nitric acid oxidation furnace equipment, by arranging a pressure relief valve at the position of the lower flange through hole, not only can the pressure be relieved during the installation process of the upper and lower flanges, and the installation difficulty of the upper and lower flanges is reduced, but also a certain pressure gas can be stored in the isolation gap in the initial state or in the local leakage state of the first protruding part, and the pressure difference between the first protruding part and the second protruding part is reduced, and the probability of further gas leakage is reduced.

[0019] (4) The double sealing structure for the large flange of the nitric acid oxidation furnace equipment, by arranging a sealing assembly on the first protruding part and the second protruding part, an additional sealing structure can be formed on the basis of the cooperation of the first protruding part and the sealing pad and the cooperation of the second protruding part and the sealing pad, and the sealing effect of the double-stage sealing is further improved. In addition, by adopting the sealing ring with a U-shaped structure in cross section, the stability of the arched sealing ring end part is higher, so that the sealing ring can be more stably matched with the sealing pad to realize sealing, and the gas pressure in the isolation gap can also enter the slot of the sealing ring through the gas guide hole, so as to balance the pressure of the sealing ring, ensure that the sealing ring can continuously and stably adhere to the sealing pad to realize sealing, and even in the process of slow leakage of the first protruding part, by balancing the pressure inside and outside the slot of the sealing ring, the deformation of the sealing ring can be reduced, so that the sealing ring can still have good sealing effect and maintain slow release of the gas. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are presented by way of example or for purpose of illustration, and not as limitations of the present application. In the drawings:

[0021] Figure 1 A structure schematic view of the double sealing structure for the large flange of the nitric acid oxidation furnace equipment according to the embodiment of the present application;

[0022] Figure 2 A structure schematic view of the double sealing structure for the large flange of the nitric acid oxidation furnace equipment according to the embodiment of the present application;

[0023] Reference signs:

[0024] 1, upper cylinder; 2, upper flange; 3, upper lining ring; 4, lower lining ring; 5, first protruding part; 6, second protruding part; 7, sealing gasket; 8, isolation gap; 9, air vent; 10, through hole; 11, control valve; 12, lower cylinder; 13, lower flange; 14, air guide hole; 15, sealing ring; 16, slotted. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] A double sealing structure for a large flange of a nitric acid oxidation furnace equipment, comprising Figure 1 and Figure 2As shown, including the upper cylinder body 1 and the lower cylinder body 12, the upper flange 2 is provided on one end of the upper cylinder body 1 towards the lower cylinder body 12, and the lower flange 13 is provided on the lower cylinder body 12 and matched with the upper flange 2; the upper flange 2 is provided with an upper gasket ring 3 on one end towards the lower flange 13, and the lower flange 13 is provided with a lower gasket ring 4 matched with the upper gasket ring 3, the upper gasket ring 3 is provided with a first protruding part 5 and a second protruding part 6 at intervals, the first protruding part 5 and the second protruding part 6 are both annular structures, and the first protruding part 5 and the second protruding part 6 are both coaxially arranged with the upper gasket ring 3, and there is an isolation gap 8 between them; the lower gasket ring 4 is provided with a sealing groove at positions corresponding to the first protruding part 5 and the second protruding part 6, and the sealing groove is provided with a sealing gasket 7 matched with the first protruding part 5 and the second protruding part 6, and the lower gasket ring 4 is provided with an air hole 9 communicating with the isolation gap 8 at a position corresponding to the first protruding part 5 and the second protruding part 6, and the lower flange 13 is provided with a through hole 10 communicating with the air hole 9.

[0030] For example, the base materials of the upper flange 2 and the lower flange 13 are 16MnIII forgings, and the materials of the upper gasket ring 3 and the lower gasket ring 4 are S32168 stainless steel. The upper flange 2 and the upper cylinder body 1, the lower flange 13 and the lower cylinder body 12, the upper gasket ring 3 and the upper flange 2, and the lower gasket ring 4 and the lower flange 13 can be connected by welding or other conventional methods, which can be selected by those skilled in the art according to actual needs, and will not be described here.

[0031] In actual application, the first protruding part 5 is arranged inside the upper gasket ring 3 as an example. By arranging the first protruding part 5 and the second protruding part 6, the first protruding part 5 and the second protruding part 6 are arranged to extend into the sealing groove and tightly fit with the sealing gasket 7, which not only forms a double-sealing structure, but also forms a structure similar to a stepped labyrinth seal by matching the first protruding part 5 or the second protruding part 6 with the sealing groove, thereby achieving a double-stage sealing effect and prolonging the flow length of the airflow, which is conducive to achieving better sealing effect and preventing ammonia leakage.

[0032] Preferably, the width of the sealing gasket 7 is greater than the width of the corresponding first protruding part 5 or second protruding part 6. By arranging the sealing gasket 7 and the sealing groove to be relatively wide, it is not only conducive to reducing the alignment and assembly difficulty of the upper flange 2 and the lower flange 13, but also can form a stepped groove on the inner and outer sides of the first protruding part 5 and the second protruding part 6, which is conducive to better achieving a stepped labyrinth seal.

[0033] Preferably, the lower flange 13 is provided with a control valve 11 corresponding to the position of the through hole 10. Exemplarily, the control valve 11 adopts a pressure relief valve, which can be installed on the lower flange 13 in a conventional manner such as screw thread. By setting the pressure relief valve, not only can the installation process of the upper and lower flanges 13 be facilitated, but also the pressure of the gas remaining in the isolation gap 8 can be reduced in the initial state or in the case of partial leakage of the first protruding part 5, thereby reducing the pressure difference between the first protruding part 5 and the second protruding part 6, and thus reducing the probability of further gas leakage. In addition, when the pressure exceeds the preset pressure of the pressure relief valve, the pressure relief valve can also be actively discharged, for example, by connecting the pressure relief valve with an external discharge pipeline to realize the control of ammonia leakage and reduce the impact of ammonia on production and production environment.

[0034] Preferably, the sealing gasket 7 adopts a temperature-resistant ceramic fiber belt. Compared with other materials, the temperature-resistant ceramic fiber belt has the advantages of high temperature resistance, low thermal conductivity, heat shock resistance and low heat capacity, and is easy to install.

[0035] Preferably, the first protruding part 5 and the second protruding part 6 are provided with sealing assemblies at one end of the sealing groove. Exemplarily, the sealing assembly includes a sealing ring 15, and the first protruding part 5 and the second protruding part 6 are provided with assembly grooves for accommodating the sealing ring 15. The sealing ring 15 can also be made of existing high-temperature resistant sealing materials, such as high-temperature resistant silicone, plastic and other materials, which can be selected by those skilled in the art according to actual needs, and will not be described here.

[0036] In actual application, by setting the sealing assembly on the first protruding part 5 and the second protruding part 6, an additional sealing structure can be formed on the basis of the cooperation of the first protruding part 5 with the sealing gasket 7 and the cooperation of the second protruding part 6 with the sealing gasket 7, which is conducive to further improving the sealing effect of the double-stage seal.

[0037] Preferably, the first protruding part 5 and the second protruding part 6 are provided with gas guide holes 14 communicating with the assembly grooves on the side facing the isolation gap 8, and the isolation gap 8 communicates with the assembly grooves through the gas guide holes 14. By setting the gas guide hole 14, the assembly difficulty of the sealing ring 15 can be reduced, so that the sealing ring 15 can be more closely attached to the inner wall of the assembly groove, which is not only conducive to improving the sealing effect of the sealing ring 15 and the sealing gasket 7, but also conducive to improving the sealing effect of the sealing ring 15 and the assembly groove.

[0038] In actual application process, utilize the sealing ring 15 and the sealing gasket 7 cooperation, not only is favorable to further improve the first convex part 5 and the second convex part 6 place's sealing effect. And when the pressure in the first convex part 5 inside is bigger, ammonia gas can also pass through the first convex part 5 and sealing gasket 7 sticking place, sealing ring 15 and the assembly groove inner wall sticking place slow release, and finally enter the isolation gap 8, change the gas pressure in the isolation gap 8, thereby reduce the pressure difference between the first convex part 5 and the second convex part 6, ensure the stability of the upper lining ring 3 and the lower lining ring 4 integral cooperation sealing, simultaneously also be favorable to part ammonia gas advance through the isolation gap 8 and the air hole 9 and orderly slow release, thereby avoid the burst leakage caused by the pressure difference too big, be favorable to further improve the safety of production.

[0039] Preferably, the sealing ring 15 is U-shaped in cross section, and the slotted opening 16 of the sealing ring 15 is in communication with the gas guide hole 14 through the assembly groove. By adopting the sealing ring 15 with U-shaped cross section, the stability of the arched end of the sealing ring 15 is improved, so that the sealing ring 15 can be more stably matched with the sealing gasket 7 to realize sealing. Moreover, the gas pressure in the isolation gap 8 can enter the slotted opening 16 of the sealing ring 15 through the gas guide hole 14, thereby balancing the pressure of the sealing ring 15 and ensuring that the sealing ring 15 can continuously and stably stick to the sealing gasket 7 to realize sealing. Even in the process of slow leakage of the first convex part 5, by balancing the pressure inside and outside the slotted opening 16 of the sealing ring 15, the deformation of the sealing ring 15 can be reduced, so that the sealing ring 15 can still have good sealing effect and maintain slow release of gas.

[0040] The double sealing structure for large flange of nitric acid oxidation furnace equipment has the advantages of good sealing effect, easy assembly and use, high safety and reliability, and can be suitable for sealing of the large flange of the nitric acid oxidation furnace equipment, thereby reducing the risk of ammonia gas leakage through the flange and ensuring the safety of production and production environment.

[0041] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double sealing structure for a large flange of a nitric acid oxidation furnace equipment, comprising an upper cylinder (1) and a lower cylinder (12), wherein an upper flange (2) is arranged on the upper cylinder (1), and a lower flange (13) matched with the upper flange (2) is arranged on the lower cylinder (12), characterized in that: The upper flange (2) is provided with an upper gasket ring (3) at one end thereof facing the lower flange (13), and the lower flange (13) is provided with a lower gasket ring (4) matched with the upper gasket ring (3), the upper gasket ring (3) is provided with a first protruding part (5) and a second protruding part (6) at intervals, the first protruding part (5) and the second protruding part (6) are annular structures, and the first protruding part (5) and the second protruding part (6) are coaxially arranged with the upper gasket ring (3), and there is an isolation gap (8) between the first protruding part (5) and the second protruding part (6); the lower gasket ring (4) is provided with a sealing groove at positions corresponding to the first protruding part (5) and the second protruding part (6), and the sealing groove is provided with a sealing gasket (7) matched with the first protruding part (5) and the second protruding part (6), and the lower gasket ring (4) is provided with an air vent hole (9) corresponding to the position between the first protruding part (5) and the second protruding part (6) and communicating with the isolation gap (8), and the lower flange (13) is provided with a through hole (10) communicating with the air vent hole (9).

2. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 1, characterized in that: The width of the sealing gasket (7) is greater than the width of the corresponding first protruding part (5) or second protruding part (6).

3. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 1, characterized in that: The lower flange (13) is provided with a control valve (11) at a position corresponding to the through hole (10).

4. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 3, characterized in that: The control valve (11) is a pressure relief valve.

5. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 1, characterized in that: The sealing gasket (7) is a temperature-resistant ceramic fiber belt.

6. The double seal structure for large flange of nitric acid oxidation furnace equipment according to any one of claims 1-5, characterized in that: One end of the first protruding part (5) and the second protruding part (6) extending into the sealing groove is provided with a sealing assembly.

7. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 6, characterized in that: The sealing assembly includes a sealing ring (15), and the first protruding part (5) and the second protruding part (6) are each provided with an assembly groove for accommodating the sealing ring (15).

8. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 7, characterized in that: The first protruding part (5) and the second protruding part (6) are each provided with an air guide hole (14) on a side facing the isolation gap (8) and communicating with the assembly groove, and the isolation gap (8) communicates with the assembly groove through the air guide hole (14).

9. The double seal structure for large flange of nitric acid oxidation furnace equipment according to claim 8, characterized in that: The cross section of the sealing ring (15) is U-shaped, and a slot (16) of the sealing ring (15) communicates with the assembly groove and the air guide hole (14).

Images