Light large-diameter connecting pipe sealing device

Abstract

The invention relates to the technical field of connecting pipe sealing, in particular to a light large-diameter connecting pipe sealing device. The light large-diameter connecting pipe sealing device specifically comprises a supporting plate, a tension brace assembly and a sealing cover. The tension brace assembly is connected with the sealing cover and the supporting plate, and the sealing cover covers the opening of the connecting pipe; the tension brace assembly comprises a sealing bolt, a pull rod body and a first nut, the sealing bolt penetrates through the sealing cover to be connected with the pull rod body, and the pull rod body penetrates through the supporting plate to be connected with the first nut; the supporting plate comprises a plate body, a plurality of flange parts and a plurality of concave parts, the flange parts and the concave parts are arranged around the edge of the plate body at intervals, the flange parts abut against the steps of the inner wall of the connecting pipe in a matched mode, the outer diameter of the flange parts is larger than the inner diameter of the inner wall of the connecting pipe, and the outer diameter of the concave parts is smaller than the inner diameter of the inner wall of the connecting pipe. The sealing structure has the advantage of being good in sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of pipe sealing, and in particular to a light-weight large-diameter pipe sealing device. Background Art

[0002] The inlet pipe seal of the lower head of the steam generator is not allowed to enter the inner wall of the lower head after electropolishing to avoid damaging the state of the electropolished surface. Therefore, the sealing tool can only be installed from the outside. However, due to limited workstations, the sealing tool needs to meet the requirement that 1 to 2 people can install it. In the past, the sealing structure of similar products was too heavy and needed to be installed from the inside of the head, which easily damaged the inner wall of the head. Therefore, the previous design is no longer applicable.

[0003] In the prior art, inflatable pipe plugs are used. During transportation, due to the temperature difference between different regions, the air pressure drops due to the temperature drop, and the friction between the pipe plug and the product connecting pipe becomes smaller. The pipe plug is accidentally dislodged due to the thrust generated by the trace pressure of internal nitrogen, causing project losses and delivery delays.

[0004] Therefore, a light-weight large-diameter pipe sealing device is provided to address the deficiencies in the prior art. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a lightweight large-diameter pipe sealing device, which aims to solve the problem of poor sealing effect caused by insufficient tension.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A light-weight large-diameter pipe sealing device comprises: a support plate, a tensioning component and a sealing cover;

[0008] The tensioning assembly connects the sealing cover and the supporting plate, and the sealing cover is arranged at the opening of the pipe;

[0009] The tension support assembly comprises a sealing bolt, a tie rod body and a first nut, wherein the sealing bolt passes through the sealing cover and is connected to the tie rod body, and the tie rod body passes through the support plate and is connected to the first nut;

[0010] The support plate includes a plate body, a plurality of flange portions and a plurality of recessed portions, wherein the plurality of flange portions and the recessed portions are arranged at intervals around the edge of the plate body, the flange portion abuts against the step of the inner wall of the connecting pipe, the outer diameter of the flange portion is larger than the inner diameter of the inner wall of the connecting pipe, and the outer diameter of the recessed portion is smaller than the inner diameter of the inner wall of the connecting pipe.

[0011] As a further improvement of the technical solution of the present invention, it also includes a first seal and a second seal, the sealing cover is provided with a first groove and a second groove for placing the first seal and the second seal, the top of the connecting pipe is provided with a first boss and an end face, the first seal is located between the first groove and the first boss, and the second seal is located between the second groove and the end face.

[0012] As a further improvement of the technical solution of the present invention, a third sealing member is further included. The sealing bolt is provided with a third groove. The third sealing member is located between the third groove and the sealing cover.

[0013] As a further improvement of the technical solution of the present invention, the pull rod body is provided with a first connecting portion, and the first connecting portion is provided with a threaded hole threadedly connected to the sealing bolt.

[0014] As a further improvement of the technical solution of the present invention, it also includes a positioning ring and a second nut, the positioning ring is provided with a through hole for the first connecting part to pass through, the first connecting part is also provided with an external thread threadedly connected to the second nut, and the first connecting part is also provided with a second boss abutting and cooperating with the positioning ring.

[0015] As a further improvement of the technical solution of the present invention, the pull rod body also includes a second connecting portion, the second connecting portion is provided with an external thread threadedly connected to the first nut, and the second connecting portion passes through the support plate.

[0016] As a further improvement of the technical solution of the present invention, a mounting plate is provided on the outer wall of the connecting pipe, and the mounting plate is connected to the sealing cover by screws.

[0017] As a further improvement of the technical solution of the present invention, the support plate is further provided with a reinforcing rib, and the reinforcing rib is located at the end away from the end abutting against the step of the inner wall of the connecting pipe.

[0018] As a further improvement of the technical solution of the present invention, a retaining ring for auxiliary installation is provided under the sealing cover.

[0019] As a further improvement of the technical solution of the present invention, the positioning ring is made of plastic.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the light-weight large-diameter pipe sealing device of the present invention, the outer diameter of the flange portion of the support plate is larger than the inner diameter of the inner wall of the pipe, and the outer diameter of the recessed portion of the support plate is smaller than the inner diameter of the inner wall of the pipe. Therefore, the support plate can smoothly enter the pipe at a certain angle, and the flange portion can be seated on the step of the inner wall of the pipe after rotating 90° inside the pipe. When in use, the sealing cover is arranged at the opening of the pipe, and the support plate and the sealing cover are connected by a bracing assembly, which relies on the bracing assembly to provide a strong pulling force, and the boss portion provides support. The light-weight large-diameter pipe sealing device has the characteristics of good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0023] Figure 1 It is a structural schematic diagram of a light-weight large-diameter pipe sealing device of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the support plate in the light-weight large-diameter pipe sealing device of the present invention;

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the pull rod body in the light large-diameter pipe sealing device of the present invention.

[0028] In the figure:

[0029] 1. Support plate; 11. Plate body; 12. Flange portion; 13. Concave portion; 14. Reinforcement ribs;

[0030] 2. tensioning assembly; 21. sealing bolt; 22. tie rod body; 221. first connecting portion; 222. second connecting portion; 23. first nut;

[0031] 3. Sealing cover; 31. Retaining ring;

[0032] 4. Connecting pipe; 41. Step; 42. Mounting plate;

[0033] 5. First sealing member; 6. Second sealing member; 7. Third sealing member;

[0034] 8. Positioning ring; 9. Second nut. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0036] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0037] Reference Figures 1 to 5 , a light-weight large-diameter pipe 4 sealing device, comprising: a support plate 1, a tensioning component 2 and a sealing cover 3;

[0038] In one embodiment, referring to Figure 1 As shown, the bracing assembly 2 connects the sealing cover 3 and the support plate 1, and the sealing cover 3 is arranged at the opening of the pipe 4; the bracing assembly 2 includes a sealing bolt 21, a tie rod body 22 and a first nut 23, the sealing bolt 21 passes through the sealing cover 3 and is connected to the tie rod body 22, and the tie rod body 22 passes through the support plate 1 and is connected to the first nut 23; refer to Figure 5 As shown, the support plate 1 includes a plate body 11, 8 flanges 12 and 8 recesses 13. The 8 flanges 12 and recesses 13 are arranged at intervals around the edge of the plate body 11, and cooperate with 8 groups of bracing assemblies 2 to make the circumferential force uniform, so as to improve the reliability of the seal and increase the force-bearing area, so that the bracing assembly 2 meets the force requirements. The flange 12 is abutted against the step 41 of the inner wall of the pipe 4. The outer diameter of the flange 12 is larger than the inner diameter of the inner wall of the pipe 4, and the outer diameter of the recess 13 is smaller than the inner diameter of the inner wall of the pipe 4. When the support plate 1 is at a certain angle, it can enter the interior of the head along the inner wall of the pipe 4, and can be seated on the step 41 inside the pipe 4 after being turned over. Preferably, the connection point between the bracing assembly 2 and the support plate 1 is located at the flange 12.

[0039] Among them, since it is no longer allowed to enter the interior to install the sealing device after the end cap is electropolished, so as to avoid damaging the electropolished surface state and causing non-conformity, it is necessary to solve the problem that the sealing element can be installed from the outside. The outer diameter of the flange portion 12 of the support plate 1 is larger than the inner diameter of the inner wall of the connecting pipe 4, and the outer diameter of the recessed portion 13 of the support plate 1 is smaller than the inner diameter of the inner wall of the connecting pipe 4. Therefore, the support plate 1 can smoothly enter the connecting pipe 4 at a certain angle, and the flange portion 12 can be seated on the step 41 of the inner wall of the connecting pipe 4 after rotating 90° inside the connecting pipe 4. At the same time, due to limited workstations, the sealing device can only be installed manually, and the weight needs to be controlled within the capacity of 1-2 people, so the lightweight problem of the sealing element needs to be solved. Preferably, the support plate 1 is stainless steel.

[0040] Similarly, since the size of the connecting pipe 4 is very large, with a diameter of 900mm, the interior needs to be evacuated before transportation and then filled with nitrogen to maintain the internal dew point to meet the packaging requirements. The pressure of the nitrogen is not large, but the force acting on the sealing cover 3 is still very large, so a strong tensioning component 2 is required to ensure the stability of the sealing cover 3. When in use, the sealing cover 3 is covered at the opening of the connecting pipe 4, and the support plate 1 and the sealing cover 3 are connected by 8 groups of tensioning components 2. The evenly distributed 8 groups of tensioning components 2 provide strong pulling force, and the boss part provides support. This lightweight large-diameter connecting pipe 4 sealing device has the characteristics of good sealing effect. In order to ensure that the support plate 1 is light and has a certain rigidity, a structural design combining thin plates, reinforcing rings and rib plates is adopted.

[0041] In one embodiment, when the plane of the support plate 1 is parallel to the center line of the connecting pipe 4 and the support plate 1 is rotated to the state where the recessed portion 13 is facing the inner wall of the connecting pipe 4, the support plate 1 can enter the interior of the connecting pipe 4 without hindrance; after the support plate 1 is flipped 90° inside the connecting pipe 4, the eight flange portions 12 can sit on the step 41 inside the connecting pipe 4, providing a force-bearing foundation for the bracing assembly 2.

[0042] In one embodiment, referring to Figure 2 As shown, due to the large size of the pipe 4, the sealing is difficult, and it is necessary to evacuate and replace nitrogen to meet the dew point requirement, and after nitrogen filling, it is necessary to maintain that the internal air pressure does not drop significantly within 24 hours, so double sealing is required to ensure the sealing effect. The sealing device also includes a first seal 5 and a second seal 6, and the sealing cover 3 is provided with a first groove and a second groove for placing the first seal 5 and the second seal 6, and the top of the pipe 4 is provided with a first boss and an end face, the first seal 5 is located between the first groove and the first boss, and the second seal 6 is located between the second groove and the end face.

[0043] In one embodiment, referring to Figure 2As shown, the sealing device further includes a third sealing member 7, the sealing bolt 21 is provided with a third groove, and the third sealing member 7 is located between the third groove and the sealing cover 3. Since the sealing diameter at the sealing bolt 21 is small, only one seal is required.

[0044] In one embodiment, referring to Figure 4 As shown, the pull rod body 22 is provided with a first connection part 221, and the first connection part 221 is provided with a threaded hole threadedly connected to the sealing bolt 21. The sealing device also includes a positioning ring 8 and a second nut 9, the positioning ring 8 is provided with a through hole for the first connection part 221 to pass through, the first connection part 221 is also provided with an external thread threadedly connected to the second nut 9, and the first connection part 221 is also provided with a second boss abutting against the positioning ring 8, the positioning ring 8 is fixed by the second nut 9, and the positioning ring 8 assists in positioning so as to align the hole position when the sealing bolt 21 is installed after the sealing cover 3 is installed. Preferably, the positioning ring 8 is made of plastic.

[0045] In one embodiment, the pull rod body 22 further includes a second connecting portion 222 . The second connecting portion 222 is provided with an external thread threadedly connected to the first nut 23 . The second connecting portion 222 penetrates the support plate 1 .

[0046] In one embodiment, a mounting plate 42 is disposed on the outer wall of the connecting pipe 4, and the mounting plate 42 is connected to the sealing cover 3 by screws.

[0047] In one embodiment, the support plate 1 is further provided with a reinforcing rib 14 , and the reinforcing rib 14 is located at an end away from the end abutting against the inner wall step 41 of the pipe 4 .

[0048] In one embodiment, since the sealing cover 3 is relatively large and weighs 166 kg, a retaining ring 31 is provided under the sealing cover 3 for auxiliary installation.

[0049] For other contents of the lightweight large-diameter pipe sealing device described in the present invention, please refer to the prior art and will not be repeated here.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A lightweight large diameter pipe sealing device, characterized in that: include: Support plate, bracing assembly and sealing cover; The tensioning assembly connects the sealing cover and the supporting plate, and the sealing cover is arranged at the opening of the pipe; The tension support assembly comprises a sealing bolt, a tie rod body and a first nut, wherein the sealing bolt passes through the sealing cover and is connected to the tie rod body, and the tie rod body passes through the support plate and is connected to the first nut; The support plate includes a plate body, a plurality of flange portions and a plurality of recessed portions, wherein the plurality of flange portions and the recessed portions are arranged at intervals around the edge of the plate body, the flange portion abuts against the step of the inner wall of the connecting pipe, the outer diameter of the flange portion is larger than the inner diameter of the inner wall of the connecting pipe, and the outer diameter of the recessed portion is smaller than the inner diameter of the inner wall of the connecting pipe.

2. A lightweight large diameter pipe sealing device according to claim 1, characterized in that: It also includes a first seal and a second seal, the sealing cover is provided with a first groove and a second groove for placing the first seal and the second seal, the top of the connecting pipe is provided with a first boss and an end face, the first seal is located between the first groove and the first boss, and the second seal is located between the second groove and the end face.

3. A lightweight large diameter pipe sealing device according to claim 1, characterized in that: It also includes a third sealing member. The sealing bolt is provided with a third groove. The third sealing member is located between the third groove and the sealing cover.

4. A light-weight large-diameter pipe sealing device according to claim 1, characterized in that: The pull rod body is provided with a first connecting portion, and the first connecting portion is provided with a threaded hole threadably connected to the sealing bolt.

5. A light-weight large-diameter pipe sealing device according to claim 4, characterized in that: It also includes a positioning ring and a second nut. The positioning ring is provided with a through hole for the first connecting part to pass through. The first connecting part is also provided with an external thread threadedly connected to the second nut. The first connecting part is also provided with a second boss abutting and cooperating with the positioning ring.

6. A light-weight large-diameter pipe sealing device according to claim 1, characterized in that: The pull rod body further includes a second connecting portion, the second connecting portion is provided with an external thread threadedly connected to the first nut, and the second connecting portion passes through the support plate.

7. A light-weight large-diameter pipe sealing device according to claim 1, characterized in that: The outer wall of the connecting pipe is provided with a mounting plate, and the mounting plate is connected with the sealing cover through screws.

8. A light-weight large-diameter pipe sealing device according to claim 1, characterized in that: The support plate is also provided with a reinforcing rib, and the reinforcing rib is located at the end away from the end abutting against the step of the inner wall of the connecting pipe.

9. A light-weight large-diameter pipe sealing device according to claim 1, characterized in that: A retaining ring for auxiliary installation is arranged under the sealing cover.

10. A light-weight large-diameter pipe sealing device according to claim 5, characterized in that: The positioning ring is made of plastic.

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