Flange bolt sealing structure

Abstract

The utility model provides a flange bolt sealing structure. The flange bolt sealing structure comprises a base body flange, an upper flange blocking plate, a double-end stud, a sealing nut, a first packing sealing structure and a second packing sealing structure. A plurality of bolt blind holes are formed in the upper end face of the base body flange, and a plurality of mounting holes are correspondingly formed in the upper flange blocking plate; the upper flange blocking plate is mounted on the upper end surface of the base body flange through the matching of the double-end stud and the sealing nut; the lower threaded section of the double-end stud is in threaded fit with the bolt blind hole of the base body flange; the upper threaded section of the double-end stud is in threaded fit with the sealing nut; the first packing sealing structure is arranged at the bottom end of the inner ring side wall of the sealing nut; the second packing sealing structure is arranged on the lower portion of the inner ring side wall of the sealing nut, and the inner side of the first packing sealing structure and the inner side of the second packing sealing structure are both located on the smooth section of the double-end stud. The flange bolt sealing structure has the advantages of being good in sealing performance, convenient to replace and maintain quickly in the later period and low in improvement cost.

Description

Technical Field

[0001] The utility model relates to the technical field of generator set assembly, and specifically, to a flange bolt sealing structure. Background Art

[0002] The power plant condenser adopts a rubber ball cleaning device. Although it can alleviate the fouling problem of the condenser to a certain extent, since the rubber balls are randomly distributed with the water flow and are easily affected by the quality and flow rate of the circulating water. According to the investigation of the operation of the condenser, there are many problems with the installed rubber ball system. The rubber ball system generally has high failure rate, low ball collection rate, and garbage blocking the heat exchange tubes, resulting in a low cleaning coefficient of the condenser. Therefore, the power plant plans to introduce a condenser performance monitoring and on-line cleaning device to achieve long-term clean and efficient operation of the condenser, improve the heat exchange efficiency of the condenser, and reduce the project cost.

[0003] Due to the limited installation space of the equipment and the compact structure design of the equipment, flange studs are used for fixed connection in many places. As Figure 1 shown, it is composed of a base flange 1, an upper flange plug 2, a traditional screw 7 and a traditional nut 8. And this kind of connection and sealing method is also widely used in power plant equipment. Because of the compact structure and narrow space of this kind of connection and sealing structure, it is difficult to handle if leakage occurs. Usually, sealing measures are taken to block the outer end of the contact surface between the base flange and the upper flange plug. However, leakage also occurs at the gap between the traditional nut 8, the traditional screw 7 and the upper flange plug 2. Considering the convenience of later repair and disassembly, there is currently no reliable and convenient sealing method, resulting in easy leakage of the medium through the gap between the nut and the screw.

[0004] Based on the above reasons, solving the emergency treatment problem of the flange stud connection sealing structure can greatly improve the equipment maintenance efficiency.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Content of the Utility Model

[0006] The purpose of the utility model is to aim at the deficiencies of the prior art, and thus provide a flange bolt sealing structure with good sealing performance, convenient for later rapid replacement and maintenance, and low transformation cost.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is: a flange bolt sealing structure, including a base flange, an upper flange plug, a stud, a sealing nut, a first packing sealing structure and a second packing sealing structure;

[0008] A plurality of bolt blind holes are arranged on the upper end surface of the base flange, and a plurality of corresponding mounting holes are arranged on the upper flange plug;

[0009] The upper flange plug plate is installed on the upper end face of the base flange through the cooperation of double-headed studs and sealing nuts;

[0010] The lower threaded section of the double-headed stud is in threaded fit with the bolt blind hole of the base flange;

[0011] The upper threaded section of the double-headed stud is in threaded fit with the sealing nut;

[0012] The first packing seal structure is arranged at the bottom end of the inner ring side wall of the sealing nut;

[0013] The second packing seal structure is arranged at the lower part of the inner ring side wall of the sealing nut;

[0014] The inner sides of the first packing seal structure and the second packing seal structure are both located on the smooth section of the double-headed stud.

[0015] The most important improvement is the addition of the double-headed stud and the two packing seal structures, making the middle a smooth section, and the contact between the smooth section and the packing seal structure is closer, thereby enhancing the sealing performance.

[0016] Based on the above, the thread directions of the upper threaded section and the lower threaded section of the double-headed stud are the same.

[0017] Based on the above, an annular sealing groove is arranged at the lower part of the inner ring side wall of the sealing nut, and the second packing seal structure is installed in the annular sealing groove.

[0018] The sealing groove is an annular embedded groove. After the second packing seal structure is embedded, it protrudes slightly from the inner surface of the sealing nut, thereby forming a good sealing performance.

[0019] Based on the above, an annular straight chamfer is arranged at the lower part of the inner ring side wall of the sealing nut, and the cross section of the first packing seal structure is a triangle matching the straight chamfer.

[0020] The angle of the straight chamfer is preferably 30°-45°, usually designed as 45 degrees. The cross section of the first packing seal structure is triangular, and the overall shape is conical.

[0021] Based on the above, the materials of the first packing seal structure and the second packing seal structure are asbestos fabric or carbon fiber or rubber or graphite or engineering plastic.

[0022] In principle, it needs to have a certain flexibility to facilitate installation.

[0023] Based on the above, the sealing nut is a T-shaped nut.

[0024] One end of the T-shaped head is in contact with the upper flange plug plate, increasing the contact surface, thereby increasing the pre-tightening force.

[0025] Based on the above, a temporary sealing measure structure is provided at the outer end of the joint between the base flange and the upper flange plug plate.

[0026] Based on the above, the temporary sealing measure structure includes waterproof sealant.

[0027] The utility model has substantial features and progress compared with the prior art. Specifically, the utility model has the following advantages:

[0028] 1. Compared with the traditional solution, in this solution, the traditional screw is transformed into a stud bolt. Its lower end is in threaded fit with the base flange, and its upper end is in threaded fit with the sealing nut. The double-section threads provide stronger pre-tightening force. The smooth section in the middle contacts the newly added sealing structure, which can increase the sealing contact area and improve the sealing performance. Moreover, during later replacement and maintenance, it is relatively easier to remove and install the sealing nut and the stud bolt.

[0029] 2. Based on the traditional nut structure, a first packing seal structure and a second packing seal structure are added inside it to widen the contact area between the nut and the upper stud bolt, and to seal the gap between the stud bolt and the upper flange plug plate, thereby ensuring the fastening and sealing strength of the nut and enhancing the reliability. Description of the Drawings

[0030] Figure 1 is the flange bolt connection structure in the prior art.

[0031] Figure 2 is the schematic structural diagram of the flange bolt sealing structure in the utility model.

[0032] In the figure: 1. Base flange; 2. Upper flange plug plate; 3. Stud bolt; 4. Sealing nut; 5. First packing seal structure; 6. Second packing seal structure; 7. Traditional screw; 8. Traditional nut; 9. Temporary sealing measure structure. Detailed Embodiments

[0033] The following further describes the technical solutions of the utility model in detail through specific embodiments.

[0034] The described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is the orientation or positional relationship shown, and it is only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] As Figure 2 shown, a flange bolt sealing structure includes a base flange 1, an upper flange plug 2, a stud 3, a sealing nut 4, a first packing sealing structure 5, and a second packing sealing structure 6.

[0038] A plurality of bolt blind holes are provided on the upper end surface of the base flange 1, and a plurality of mounting holes corresponding thereto are provided on the upper flange plug 2, usually distributed at equal intervals in a ring shape.

[0039] The upper flange plug 2 is mounted on the upper end surface of the base flange 1 through the cooperation of the stud 3 and the sealing nut 4, and the sealing nut is a T-shaped nut. The lower threaded section of the stud 3 is in threaded cooperation with the bolt blind hole of the base flange 1, and the upper threaded section of the stud 3 is in threaded cooperation with the sealing nut 4; in this embodiment, the thread directions of the upper threaded section and the lower threaded section of the stud 3 are the same, and the middle is a smooth section, and the smooth section can increase the contact area and thus increase the sealing performance.

[0040] In this embodiment, the first packing sealing structure 5 is provided at the bottom end of the inner ring side wall of the sealing nut 4; the second packing sealing structure 6 is provided at the lower part of the inner ring side wall of the sealing nut 4, and the inner sides of the first packing sealing structure 5 and the second packing sealing structure 6 are both located at the smooth section of the stud 3, so that the sealing performance of both is greatly improved, and internal leakage is not easy to leak out.

[0041] In this embodiment, a ring-shaped sealing groove is provided at the lower part of the inner ring side wall of the sealing nut, and the second packing sealing structure is installed in the ring-shaped sealing groove. The sealing groove is a ring-shaped embedded groove, and after the second packing sealing structure is embedded, it protrudes slightly from the inner surface of the sealing nut, thereby forming a good sealing performance.

[0042] The lower part of the inner ring side wall of the sealing nut is provided with an annular straight chamfer, and the cross-section of the first packing seal structure is a triangle matching the straight chamfer. The angle of the straight chamfer is preferably 30°-45°, usually designed to be 45 degrees. The cross-section of the first packing seal structure is triangular, and the overall shape is conical.

[0043] In this embodiment, the materials of the first packing seal structure and the second packing seal structure are asbestos fabric or carbon fiber or rubber or graphite or engineering plastics.

[0044] Technical principle description:

[0045] After the structure is transformed, once the cavity side 10 of the base flange 1 and the upper flange plug plate 2 fails to be sealed and the liquid leaks along the gap, the staff can set a temporary seal measure structure 9 at the outer end of the joint between the base flange and the upper flange plug plate, such as a waterproof sealant. At the contact position of the sealing nut 4 and the stud 3, due to the cooperation of the added middle smooth section and the two packing seal structures, the sealing strength is improved, and no additional temporary seal measure is required for plugging, nor will it cause leakage. More importantly, this structure can be quickly replaced and maintained without affecting the subsequent maintenance work.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still modifications can be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed in the present invention.

Claims

1. A flange bolt sealing structure, characterized in that: It includes a base flange, an upper flange plug plate, a stud, a sealing nut, a first packing seal structure and a second packing seal structure; A number of bolt blind holes are arranged on the upper end surface of the base flange, and a number of mounting holes are correspondingly arranged on the upper flange plug plate; The upper flange plug plate is installed on the upper end surface of the base flange through the cooperation of the stud and the sealing nut; The lower threaded section of the stud is in threaded cooperation with the bolt blind hole of the base flange; The upper threaded section of the stud is in threaded cooperation with the sealing nut; The first packing seal structure is arranged at the bottom end of the inner ring side wall of the sealing nut; The second packing seal structure is arranged at the lower part of the inner ring side wall of the sealing nut; The inner sides of the first packing seal structure and the second packing seal structure are both located on the smooth section of the stud.

2. The flange bolt sealing structure according to claim 1, characterized in that: The thread directions of the upper threaded section and the lower threaded section of the stud are the same.

3. The flange bolt sealing structure according to claim 2, characterized in that: An annular sealing groove is arranged at the lower part of the inner ring side wall of the sealing nut, and the second packing seal structure is installed in the annular sealing groove.

4. The flange bolt sealing structure according to claim 3, wherein: An annular straight chamfer is arranged at the lower part of the inner ring side wall of the sealing nut, and the cross section of the first packing seal structure is a triangle matching the straight chamfer.

5. The flange bolt sealing structure according to claim 3 or 4, characterized in that: The materials of the first packing seal structure and the second packing seal structure are asbestos fabric or carbon fiber or rubber or graphite or engineering plastics.

6. The flange bolt sealing structure according to any one of claims 1-4, characterized in that: The sealing nut is a T-shaped nut.

7. The flange bolt sealing structure according to claim 5, characterized in that: The sealing nut is a T-shaped nut.

8. The flange bolt sealing structure according to claim 6, characterized in that: A temporary sealing measure structure is arranged at the outer end of the joint between the base flange and the upper flange plug plate.

9. The flange bolt sealing structure according to claim 7, characterized in that: A temporary sealing measure structure is arranged at the outer end of the joint between the base flange and the upper flange plug plate.

10. The flange bolt sealing structure according to claim 8 or 9, characterized in that: The temporary sealing measure structure includes a waterproof sealant.

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