A takeover sealing device and its installation method

Abstract

The present invention discloses a nozzle sealing device and an installation method thereof. The nozzle sealing device includes: a sealing shaft installed in a nozzle fixedly connected to a pressure vessel; a sealing ring group disposed between the sealing shaft and the nozzle for sealing the nozzle during a hydrostatic test of the pressure vessel; and a guide sleeve for pre-compressing the sealing ring group so that the sealing ring group is not damaged by the blunt edge of the nozzle during the process of being assembled into the nozzle. In the present invention, the sealing ring group includes a double-sealing ring, which can improve the probability of successful sealing of the nozzle, and thus significantly improve the reliability and sealing efficiency of the nozzle sealing device. The nozzle sealing device disclosed in the present invention has a simple structure, is convenient for disassembly and assembly, has a low manufacturing cost, and also has strong operability and versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrostatic testing of pressure vessels, and particularly to a nozzle sealing device for hydrostatic testing of nuclear power pressure vessels and an installation method thereof. Background Art

[0002] After a medium-sized nuclear power pressure vessel is manufactured, it is necessary to conduct a high-pressure hydrostatic test on it; during the high-pressure hydrostatic test, it is first necessary to seal the nozzles of the pressure vessel. The diameters of the nozzles of the medium-sized nuclear power pressure vessel are φ200mm to φ300mm, and generally there is a root face at the end of the pressure vessel nozzle (as Figure 1 shown). However, the inner hole at the end of the pressure vessel nozzle is not chamfered, resulting in that when using a conventional hole-shaft sealing device (see Figure 2 ) to seal the pressure vessel nozzle, the sealing ring in the conventional hole-shaft sealing device is easily sheared and damaged by the root face at the end of the pressure vessel nozzle, affecting the sealing effect of the conventional hole-shaft sealing device, and further causing problems such as pressure leakage during the pressure holding process of the pressure vessel. In addition, there are no flanges and bosses on the outer wall of the pressure vessel nozzle, and the sealing device can only be fixed from the inside of the pressure vessel nozzle, making it impossible to observe whether the sealing ring is intact after the conventional hole-shaft sealing device is installed, and it can only be judged whether the sealing ring is damaged when the pressure vessel is filled with water and pressurized; if it is found at this time that the sealing ring is damaged, it is very difficult to replace the sealing ring. Summary of the Invention

[0003] The purpose of the present invention is to provide a nozzle sealing device and an installation method thereof, by setting a double sealing ring and pre-compressing the sealing ring group during the process of installing the sealing ring into the nozzle, so as to improve the probability of successful sealing of the nozzle.

[0004] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0005] A nozzle sealing device includes:

[0006] A sealing shaft, installed in a nozzle fixedly connected to a pressure vessel;

[0007] A sealing ring group, arranged between the sealing shaft and the nozzle, for sealing the nozzle when the pressure vessel conducts a hydrostatic test; and

[0008] A guide sleeve, used for pre-compressing the sealing ring group so that the sealing ring group is not damaged by the root face of the nozzle during the process of being installed into the nozzle.

[0009] Preferably, the sealing shaft includes:

[0010] The shaft body is arranged between the first end and the second end of the connecting pipe; the first end and the second end of the connecting pipe are arranged oppositely, and the second end of the connecting pipe is fixedly connected to the pressure vessel;

[0011] The top block is arranged at one end of the shaft body away from the pressure vessel; and the side wall of the top block abuts against the inner side wall of the connecting pipe, so that one end of the sealing shaft is fixedly connected to the first end of the connecting pipe; and

[0012] The flange is arranged at one end of the shaft body close to the pressure vessel and is fixedly connected to the tapered ring assembly; and the tapered ring assembly abuts against the inner side wall of the connecting pipe, so that the other end of the sealing shaft is fixedly connected to the second end of the connecting pipe through the tapered ring assembly.

[0013] Preferably, the side wall of the top block is provided with a first groove and a second groove; and the first groove and the second groove are arranged at intervals along the side wall of the top block;

[0014] The sealing ring group includes a first sealing ring and a second sealing ring; the first sealing ring is arranged in the first groove, and the second sealing ring is arranged in the second groove.

[0015] Preferably, the tapered ring assembly includes:

[0016] The inner tapered ring is fixedly connected to the flange of the sealing shaft;

[0017] The outer tapered ring is fixedly connected to the inner tapered ring; and the outer side wall of the outer tapered ring abuts against the inner side wall of the connecting pipe.

[0018] Preferably, when the first sealing ring is inserted into the connecting pipe, the first sealing ring is fixed in the first groove of the sealing shaft, and the guide sleeve is sleeved on the first sealing ring; and the guide sleeve is placed on the first end face of the connecting pipe, and the shaft body of the sealing shaft is placed in the connecting pipe, so that the sealing shaft and the first sealing ring fixed on the sealing shaft fall into the connecting pipe under the action of gravity;

[0019] When the second sealing ring is inserted into the connecting pipe, the guide sleeve is sleeved on the second sealing ring; and the guide sleeve is placed on the first end face of the connecting pipe, and the second sealing ring is inserted into the second groove of the sealing shaft that has been inserted into the connecting pipe.

[0020] Preferably, the inner diameter of the guide sleeve is smaller than the inner diameter of the connecting pipe, and the outer diameters of the first sealing ring and the second sealing ring sleeved with the guide sleeve are both smaller than the inner diameter of the connecting pipe, so that the first sealing ring and the second sealing ring are not damaged by the blunt edge of the connecting pipe when inserted into the connecting pipe.

[0021] Preferably, a groove is provided at one end of the top block away from the shaft body, and the starting and ending points of the groove are respectively located at the second groove and on the end surface of the top block away from the shaft body, for replacing the second sealing ring installed in the connecting pipe.

[0022] Preferably, the groove angle ranges from 10 degrees to 20 degrees.

[0023] Preferably, the pipe sealing device further comprises:

[0024] A fixing rod, a first end of which is fixedly connected to an end of the shaft body close to the pressure vessel, and a second end of which extends into the pressure vessel;

[0025] A baffle is disposed in the pressure container and fixedly connected to the fixing rod. The baffle abuts against the second end surface of the connecting pipe and is used to fix the fixing rod and the sealing shaft connected to the fixing rod to the connecting pipe.

[0026] Preferably, the pipe sealing device further comprises:

[0027] A pressure plate is disposed in the pressure container and fixedly connected to the fixing rod; the pressure plate abuts against the baffle plate and is used to fix the baffle plate, the fixing rod and the sealing shaft connected to the fixing rod to the connecting pipe;

[0028] The end cover is fixedly connected to the end of the top block away from the shaft body; and an extension portion is provided at the end of the end cover close to the top block, and the extension portion is embedded in the gap formed by the groove of the top block and the inner side wall of the connecting pipe to seal the first end of the connecting pipe.

[0029] On the other hand, the present invention also provides a method for installing a pipe sealing device, comprising:

[0030] Providing a pipe sealing device as described above;

[0031] Place the first end of the pipe facing upward;

[0032] The first end of the fixing rod is fixedly connected to the end of the shaft body of the sealing shaft close to the pressure vessel;

[0033] Fixing the first sealing ring in the sealing ring group in the first groove of the sealing shaft;

[0034] Sleeving the guide sleeve on the first sealing ring to pre-compress the first sealing ring;

[0035] Place the guiding sleeve on the first end face of the adapter pipe, and place the shaft body of the sealing shaft inside the adapter pipe, so that the sealing shaft, the first sealing ring and the fixing rod fixed on the sealing shaft fall into the adapter pipe under the action of gravity and seal the adapter pipe;

[0036] Fix the inner conical ring of the conical ring assembly to the flange of the sealing shaft; the outer conical ring of the conical ring assembly is fixedly connected through the inner conical ring, and the outer side wall of the outer conical ring abuts against the inner side wall of the adapter pipe; and

[0037] Fix the baffle plate to the fixing rod, and the baffle plate abuts against the second end face of the adapter pipe to fix the fixing rod and the sealing shaft connected to the fixing rod on the adapter pipe.

[0038] Preferably, the installation method of the adapter pipe sealing device further includes:

[0039] Place the first end of the adapter pipe downward;

[0040] Fix the pressing plate to the fixing rod, and the pressing plate abuts against the baffle plate to fix the baffle plate, the fixing rod and the sealing shaft connected to the fixing rod on the adapter pipe;

[0041] Set the guiding sleeve on the second sealing ring of the sealing ring group to pre-compress the second sealing ring;

[0042] Place the guiding sleeve on the first end face of the adapter pipe, and insert the second sealing ring into the second groove of the sealing shaft that has been installed in the adapter pipe to seal the adapter pipe; and

[0043] Fix the end cover to the end of the top block away from the shaft body; and the extending part of the end cover is embedded in the gap formed by the groove of the top block and the inner side wall of the adapter pipe to seal the first end of the adapter pipe.

[0044] Compared with the prior art, the present invention has at least one of the following advantages:

[0045] A kind of adapter pipe sealing device and its installation method provided by the present invention can seal the adapter pipe during the hydrostatic test of the pressure vessel through the sealing ring group arranged between the sealing shaft and the adapter pipe, and the sealing ring group includes a first sealing ring and a second sealing ring, which can improve the probability of successful sealing of the adapter pipe, and thus significantly improve the reliability and sealing efficiency of the adapter pipe sealing device.

[0046] During the process of installing the sealing ring group into the adapter pipe, the present invention can pre-compress the sealing ring group through the guiding sleeve, so as to protect the sealing ring group from being damaged by the blunt edge of the adapter pipe, and thus improve the installation efficiency of the adapter pipe sealing device.

[0047] One end of the top block of the sealed shaft in the present invention is provided with a bevel. When the second sealing ring installed in the connecting pipe is damaged, it can be replaced through the bevel, so that the connecting pipe sealing device can continue to seal the connecting pipe.

[0048] The connecting pipe sealing device in the present invention has a simple structure, is convenient for disassembly and assembly, and has a low manufacturing cost. At the same time, it also has strong operability and versatility. Description of the Drawings

[0049] Figure 1 is a schematic structural diagram of a pressure vessel connecting pipe;

[0050] Figure 2 is a schematic structural diagram of a conventional hole-shaft sealing device;

[0051] Figure 3 is a schematic cross-sectional view of a connecting pipe sealing device provided by an embodiment of the present invention;

[0052] Figure 4 is a schematic three-dimensional structure diagram of a connecting pipe sealing device provided by an embodiment of the present invention;

[0053] Figure 5 is an installation process diagram of a connecting pipe sealing device provided by an embodiment of the present invention. Detailed Embodiment

[0054] The following further details a connecting pipe sealing device and its installation method proposed by the present invention in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features, and advantages of the present invention more obvious and understandable, please refer to the drawings. It should be known that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions of the implementation of the present invention. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0055] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0056] Combined with the attached Figures 3 to 5 As shown, this embodiment provides a takeover sealing device, including: a sealing shaft 110 installed in a nozzle 101 fixedly connected to a pressure vessel 100; a sealing ring group disposed between the sealing shaft 110 and the nozzle 101 for sealing the nozzle 101 during a hydrostatic test of the pressure vessel 100; and a guide sleeve 130 for pre-compressing the sealing ring group so that the sealing ring group is not damaged by the sharp edge of the nozzle 101 during the process of being assembled into the nozzle 101.

[0057] Please refer to Figure 3 and Figure 4 , the sealing shaft 110 includes: a shaft body 1101 disposed between the first end and the second end of the nozzle 101; the first end and the second end of the nozzle 101 are oppositely arranged, and the second end of the nozzle 101 is fixedly connected to the pressure vessel 100; a top block 1102 disposed at one end of the shaft body 1101 away from the pressure vessel 100; and the side wall of the top block 1102 abuts against the inner wall of the nozzle 101 so that one end of the sealing shaft 110 is fixedly connected to the first end of the nozzle 101; and a flange 1103 disposed at one end of the shaft body 1101 close to the pressure vessel 100 and fixedly connected to a conical ring assembly; and the conical ring assembly abuts against the inner wall of the nozzle 101 so that the other end of the sealing shaft 110 is fixedly connected to the second end of the nozzle 101 through the conical ring assembly.

[0058] It can be understood that in some other embodiments, the conical ring assembly includes: an inner conical ring 1104 fixedly connected to the flange 1103 of the sealing shaft 110; an outer conical ring 1105 fixedly connected to the inner conical ring 1104; and the outer side wall of the outer conical ring 1105 abuts against the inner wall of the nozzle 101.

[0059] Specifically, in this embodiment, the sealing shaft 110 can be formed by welding the shaft body 1101, the top block 1102 and the flange 1103, that is, the shaft body 1101, the top block 1102 and the flange 1103 are integrally arranged. To reduce the weight of the sealing shaft 110 and facilitate installation and use, the shaft body 1101 can be a hollow cylinder, and the inner hole of the shaft body 1101 can be a threaded hole. The diameter of the top block 1102, the inner diameter and the outer diameter of the shaft body 1101 can be set according to the inner diameter of the connecting pipe 101 and the standard GB / T3452.1. Preferably, the material of the sealing shaft 110 (including the shaft body, the top block and the flange) can be carbon steel, and surface treatment is carried out on the sealing shaft 110 after processing to prevent pollution, but the present invention is not limited thereto.

[0060] Specifically, in this embodiment, the inner conical ring 1104 can be fixedly connected to the flange 1103 of the sealing shaft 110 through a first fixing member; the outer conical ring 1105 can be tightened with the inner conical ring 1104 through a second fixing member, and by using the self-expanding effect of the outer conical ring 1105, the outer side wall of the outer conical ring 1105 is abutted against the inner side wall of the connecting pipe 101, so as to realize the fixed connection between one end of the sealing shaft 110 close to the pressure vessel 100 and the inner side wall of the connecting pipe 101, and further prevent the end of the sealing shaft 110 close to the pressure vessel 100 from swinging randomly. Preferably, the materials of the inner conical ring 1104 and the outer conical ring 1105 can both be POM plastics. POM plastics have good stability and can protect the inner side wall of the connecting pipe 101 from being scratched; the first fixing member and the second fixing member can both be bolts, but the present invention is not limited thereto.

[0061] Please continue to refer to Figure 3 and Figure 4 , a first groove and a second groove are provided on the side wall of the top block 1102; and the first groove and the second groove are arranged at intervals along the side wall of the top block 1102; the sealing ring group includes a first sealing ring 121 and a second sealing ring 122; the first sealing ring 121 is arranged in the first groove, and the second sealing ring 122 is arranged in the second groove.

[0062] Specifically, in this embodiment, third grooves and fourth grooves are further provided on the side wall of the top block 1102. The third grooves are arranged at intervals from the first groove and the second groove along the side wall of the top block 1102, and the fourth grooves are arranged adjacent to the second groove; the first groove is close to the shaft body 1101, the third groove is far from the shaft body 1101, and the second groove and the fourth groove are located between the first groove and the third groove, that is, when the first end of the adapter pipe 101 faces upward, the side wall of the top block 1102 is successively the third groove, the fourth groove, the second groove and the first groove from top to bottom. In addition, since the end of the top block 1102 far from the shaft body 1101 extends beyond the first end of the connecting pipe 101, the third groove is located outside the connecting pipe 101. Preferably, the depths and widths of the first groove, the second groove, the third groove and the fourth groove can be determined according to their own positions and the standard GB / T3452.3, but the present invention is not limited thereto.

[0063] Specifically, in this embodiment, the seal ring group further includes a third seal ring 123 and a retaining ring 124. The third seal ring 123 is arranged in the third groove, and the retaining ring 124 is arranged in the fourth groove. After the adapter pipe sealing device is installed in the adapter pipe 101, the first seal ring 121 and the second seal ring 122 are the main sealing members and are redundant backups for each other, that is, when the first seal ring 121 fails, the second seal ring 121 is enabled so that the adapter pipe sealing device can continue to seal the adapter pipe 101, thereby improving the reliability of the adapter pipe sealing device; the third seal ring 123 is an auxiliary sealing member, and the retaining ring 124 is used to prevent the second seal ring 122 and the first seal ring 121 from being blown off by pressure. Preferably, the first seal ring 121, the second seal ring 122 and the third seal ring 123 can all adopt O-ring seals, and the retaining ring 124 can adopt a retaining ring for O-ring seals; the models of the first seal ring 121, the second seal ring 122, the third seal ring 123 and the retaining ring 124 can be selected through the standard GB / T3452.1, but the present invention is not limited thereto.

[0064] Please continue to refer to Figure 5When the first sealing ring 121 is inserted into the connecting pipe 101, the first sealing ring 121 is fixed in the first groove of the sealing shaft 110, and the guide sleeve 130 is sleeved on the first sealing ring 121. And the guide sleeve 130 is placed on the first end face of the connecting pipe 101, and the shaft body 1101 of the sealing shaft 110 is placed in the connecting pipe 101, so that the sealing shaft 110 and the first sealing ring 121 fixed on the sealing shaft 110 fall into the connecting pipe 101 under the action of gravity. When the second sealing ring 122 is inserted into the connecting pipe 101, the guide sleeve 130 is sleeved on the second sealing ring 122. And the guide sleeve 130 is placed on the first end face of the connecting pipe 101, and the second sealing ring 122 is inserted into the second groove of the sealing shaft 110 that has been inserted into the connecting pipe 101.

[0065] It can be understood that in some other embodiments, the inner diameter of the guide sleeve 130 is smaller than the inner diameter of the connecting pipe 101, and the outer diameters of the first sealing ring 121 and the second sealing ring 122 sleeved with the guide sleeve 130 are both smaller than the inner diameter of the connecting pipe 101, so that the first sealing ring 121 and the second sealing ring 122 will not be damaged by the blunt edge of the connecting pipe 101 when inserted into the connecting pipe 101.

[0066] Specifically, in this embodiment, the first end of the connecting pipe 101 is upward, and at this time, the first sealing ring 121 and the sealing shaft 110 can be inserted into the connecting pipe 101 together. More specifically, first, the first sealing ring 121 is fixed in the first groove, and then the guide sleeve 130 is sleeved on the first sealing ring 121 to pre-compress the first sealing ring 121. Subsequently, the guide sleeve 130 is placed on the first end face of the connecting pipe 101, and the shaft body 1101 of the sealing shaft 110 is placed in the connecting pipe 101, then the sealing shaft 110 and the first sealing ring 121 fixed on the sealing shaft 110 will fall into the connecting pipe 101 together under the action of gravity. Since the inner diameter of the guide sleeve 130 is smaller than the inner diameter of the connecting pipe 101, the outer diameter of the first sealing ring 121 sleeved with the guide sleeve 130 is smaller than the inner diameter of the connecting pipe 101. During the process of the first sealing ring 121 falling into the connecting pipe 101, it can be ensured that the first sealing ring 121 will not touch the blunt edge of the connecting pipe 101, so as not to be damaged by the blunt edge of the connecting pipe 101, thereby protecting the integrity of the first sealing ring 121 and improving the reliability of the connecting pipe sealing device.

[0067] After the first sealing ring 121 and the sealing shaft 110 are inserted into the connecting pipe 101, the first end of the connecting pipe 101 is oriented downward. At this time, the second sealing ring 122 and the retaining ring 124 can be sequentially inserted into the connecting pipe 101 through the guide sleeve 130. More specifically, first, the guide sleeve 130 is sleeved on the second sealing ring 122, then the guide sleeve 130 is placed on the first end face of the connecting pipe 101, and then the second sealing ring 122 is inserted into the second groove of the sealing shaft 110 that has been inserted into the connecting pipe 101; after the second sealing ring 122 is inserted into the connecting pipe 101, the guide sleeve 130 can be sleeved on the retaining ring 124, then the guide sleeve 130 is placed on the first end face of the connecting pipe 101, and the retaining ring 124 is inserted into the fourth groove of the sealing shaft 110 that has been inserted into the connecting pipe 101; at this time, both the second sealing ring 122 and the retaining ring 124 are successfully inserted into the connecting pipe 101 and are not damaged by the blunt edge of the connecting pipe 101. Since the third groove is located outside the connecting pipe 101, the third sealing ring 123 can be directly fixed in the third groove of the sealing shaft 110, but the present invention is not limited thereto.

[0068] Please also refer to Figure 3 and Figure 4 , a bevel is provided at one end of the top block 1102 away from the shaft body 1101, and the starting and ending points of the bevel are respectively located at the second groove and the end face of the top block 1102 away from the shaft body 1101, for replacing the damaged second sealing ring 122 that has been inserted into the connecting pipe 101.

[0069] It can be understood that in some other embodiments, the range of the bevel angle is 10 degrees to 20 degrees.

[0070] Specifically, in this embodiment, when the pressure vessel 100 is filled with water and both the first sealing ring 121 and the second sealing ring 122, which are the main sealing members, fail, the damaged second sealing ring 122 in the second groove can be removed through the bevel, and a new second sealing ring 122 can be inserted into the second groove, so as to continue to seal the connecting pipe 101. Preferably, the bevel angle is 15 degrees, but the present invention is not limited thereto.

[0071] Please continue to refer to Figure 3 and Figure 4The pipe sealing device also includes: a fixing rod 140, a first end of which is fixedly connected to an end of the shaft body 1101 close to the pressure vessel 100, and a second end of which extends into the pressure vessel 100; a baffle 142, which is arranged in the pressure vessel 100 and fixedly connected to the fixing rod 140, and the baffle 142 abuts against the second end surface of the pipe 101, and is used to fix the fixing rod 140 and the sealing shaft 110 connected to the fixing rod 140 to the pipe 101.

[0072] It can be understood that, in some other embodiments, the pipe sealing device further includes: a pressure plate 143, which is arranged in the pressure vessel 100 and fixedly connected to the fixing rod 140; and the pressure plate 143 abuts against the baffle 142, and is used to fix the baffle 142, the fixing rod 140 and the sealing shaft 110 connected to the fixing rod 140 to the pipe 101; an end cover 150, which is fixedly connected to an end of the top block 1102 away from the shaft body 1101; and an extension portion is provided at an end of the end cover 150 close to the top block 1102, and the extension portion is embedded in the gap formed by the groove of the top block 1102 and the inner side wall of the pipe 101, so as to seal the first end of the pipe 101.

[0073] Specifically, the fixing rod 140 can be a double-headed stud, and the diameter of the fixing rod 140 is the same as the inner hole diameter of the shaft body 1101, so that the first end of the fixing rod 140 can be fixed in the inner hole of the shaft body 1101. A spacer 141 can be arranged between the baffle 142 and the second end of the connecting pipe 101. The end face of the first end of the spacer 141 abuts against the end face of the second end of the connecting pipe 101, and the end face of the second end of the spacer 141 abuts against the baffle 141, which is used to prevent the baffle 142 from causing indentation on the end face of the second end of the connecting pipe 101. A first through hole is provided in the center of the baffle 142, and the first through hole can be a threaded hole, so that the baffle 142 can be fixed on the fixing rod 140 through the first through hole, thereby fixing the spacer 141, the fixing rod 140 and the sealing shaft 110 on the connecting pipe 101. Furthermore, when the sealing shaft 110 is under pressure, the sealing shaft 110 can be fixed in place, so that the sealing ring group fixed on the sealing shaft 110 can continue to seal the connecting pipe 101; at the same time, it can also prevent the spacer 141, the fixing rod 140 and the sealing shaft 110 from moving when the first end of the connecting pipe 101 is facing downwards later. A second through hole is provided in the center of the pressing plate 143, so that the pressing plate 143 can be sleeved on the fixing rod 140 through the second through hole, and at the same time, the pressing plate 143 can be fixed on the fixing rod 140 through the third fixing member 146; the area and thickness of the pressing plate 143 are both larger than the area and thickness of the baffle 142, which can fix the sealing shaft 110 more firmly when the sealing shaft 110 is under pressure, but the present invention is not limited thereto.

[0074] In this embodiment, a first spherical washer 144 and a second spherical washer 145 can also be arranged between the pressing plate 143 and the third fixing member 146 to play a role in preventing loosening. The spacer 141 can be a nylon spacer, and the third fixing member 146 can be a nut; and the materials of the fixing rod 140, the baffle 142, the pressing plate 143 and the third fixing member 146 can all be carbon steel, and their surfaces are treated to prevent pollution.

[0075] Specifically, in this embodiment, when the first sealing ring 121, the second sealing ring 122, and the retaining ring 124 are all installed in the pipe 101, and the third sealing ring 123 is fixed in the third groove of the sealing shaft 110, the guide sleeve 130 can be placed between the end cover 150 and the first end of the pipe 101 to protect the first end surface of the pipe 101. The end cover 150 can be fixedly connected with the end of the top block 1102 away from the shaft body 1101 through the fourth fixing member 151, and the end cover 150 and the extension part can cooperate with the third sealing ring 123 to seal the first end of the pipe 101, so that the sealing of the pipe 101 is more strict. Preferably, the material of the end cover 150 can be stainless steel, and the inner diameter, outer diameter and thickness of the end cover 150 can be determined according to the standard GB / T3452.1; the fourth fixing member 151 can be a hexagonal head bolt, but the present invention is not limited thereto.

[0076] In addition, since the safety of the water pressure test on the pressure vessel 100 must be guaranteed, the pressure of the water pressure test must also be considered when selecting the models of the first sealing ring 121, the second sealing ring 122, the retaining ring 124 and the third sealing ring 123, setting the length and diameter of the fixing rod 140, and setting the thickness of the baffle 142 and the pressure plate 143.

[0077] On the other hand, combined with Figure 5As shown, this embodiment further provides an installation method for a takeover sealing device, including: Step S101, providing the takeover sealing device as described above; Step S102, turning the first end of the takeover 101 upward; Step S103, fixedly connecting the first end of the fixing rod 140 to one end of the shaft body 1101 of the sealing shaft 110 close to the pressure vessel 100; Step S104, fixing the first sealing ring 121 in the first groove of the sealing shaft 110; Step S105, sleeving the guiding sleeve 130 on the first sealing ring 121 to pre-compress the first sealing ring 121; Step S106, placing the guiding sleeve 130 on the end face of the first end of the takeover 101, and placing the shaft body 1101 of the sealing shaft 110 into the takeover 101, so that the sealing shaft 110, the first sealing ring 121 fixed on the sealing shaft 110, and the fixing rod 140 fall into the takeover 101 under the action of gravity and seal the takeover 101; Step S107, fixedly connecting the inner conical ring 1104 of the conical ring assembly to the flange 1103 of the sealing shaft 110; the outer conical ring 1105 of the conical ring assembly is fixedly connected through the inner conical ring 1104, and the outer side wall of the outer conical ring 1105 abuts against the inner side wall of the takeover 101; and Step S108, fixedly connecting the baffle 142 to the fixing rod 140, and the baffle 142 abuts against the end face of the second end of the takeover 101 to fix the fixing rod 140 and the sealing shaft 110 connected to the fixing rod 140 on the takeover 101.

[0078] It can be understood that in some other embodiments, the installation method of the takeover sealing device further includes: Step S109, turning the first end of the takeover 101 downward; Step S110, fixedly connecting the pressing plate 143 to the fixing rod 140, and the pressing plate 143 abuts against the baffle 142 to fix the baffle 142, the fixing rod 140, and the sealing shaft 110 connected to the fixing rod 140 on the takeover 101; Step S111, sleeving the guiding sleeve 130 on the second sealing ring 122 of the sealing ring group to pre-compress the second sealing ring 122; Step S112, placing the guiding sleeve 130 on the end face of the first end of the takeover 101, and inserting the second sealing ring 122 into the second groove of the sealing shaft 110 that has been installed in the takeover 101 to seal the takeover 101; and Step S113, fixedly connecting the end cover 150 to one end of the top block 1102 away from the shaft body 1101; and the extending portion of the end cover 150 is embedded in the gap formed by the groove of the top block 1102 and the inner side wall of the takeover 101 to seal the first end of the takeover 101.

[0079] Specifically, in this embodiment, in step S107, the inner conical ring 1104 can be fixedly connected to the flange 1103 of the sealing shaft 110 through a first fixing member; the outer conical ring 1105 can be clamped to the inner conical ring 1104 through a second fixing member, and by using the self-expanding effect of the outer conical ring 1105, the outer side wall of the outer conical ring 1105 is abutted against the inner side wall of the nozzle 101, so as to realize the fixed connection between one end of the sealing shaft 110 close to the pressure vessel 100 and the inner side wall of the nozzle 101, and further prevent the end of the sealing shaft 110 close to the pressure vessel 100 from swinging randomly. However, the present invention is not limited thereto.

[0080] Specifically, in this embodiment, before performing step S108, a spacer 141 is further included to be disposed between the second end of the nozzle 101 and the baffle 142, and the first end face of the spacer 141 abuts against the second end face of the nozzle 101, and the second end face of the spacer 141 abuts against the baffle 142, so as to prevent the baffle 142 from causing indentation on the second end face of the nozzle 101. However, the present invention is not limited thereto.

[0081] Specifically, in this embodiment, in step S108, the baffle 142 can be fixedly connected to the fixing rod 140 through the first through hole, and the baffle 142 can fix the spacer 141, the fixing rod 140 and the sealing shaft 110 on the nozzle 101, so that when the sealing shaft 110 is under pressure, the sealing shaft 110 can be fixed in place, so that the sealing ring group fixed on the sealing shaft 110 can continue to seal the nozzle 101; at the same time, it can also prevent the spacer 141, the fixing rod 140 and the sealing shaft 110 from moving when the first end of the nozzle 101 is facing downwards later. However, the present invention is not limited thereto.

[0082] Specifically, in this embodiment, in step S110, the pressing plate 143 can be sleeved on the fixing rod 140 through the second through hole, and at the same time, the pressing plate 143 can be fixed to the fixing rod 140 through a third fixing member 146; step S110 further includes sequentially disposing the first spherical washer 144 and the second spherical washer 145 between the pressing plate 143 and the third fixing member 146 to play a role in preventing loosening. However, the present invention is not limited thereto.

[0083] Specifically, in this embodiment, before performing the step S113, it further includes sleeving the guide sleeve 130 on the retaining ring 124, then placing the guide sleeve 123 on the first end face of the connecting pipe 101, and inserting the retaining ring 124 into the fourth groove of the sealing shaft 110 that has been inserted into the connecting pipe 101; fixing the third sealing ring 123 in the third groove of the sealing shaft 110; and after the installation of the first sealing ring 121, the second sealing ring 122, the retaining ring 124 and the third sealing ring 123 is completed, setting the guide sleeve 130 between the end cover 150 and the first end of the connecting pipe 101 to protect the first end face of the connecting pipe 101, but the present invention is not limited thereto.

[0084] Specifically, in this embodiment, in the step S113, the end cover 150 can be fixedly connected to the end of the top block 1102 away from the shaft body 1101 through the fourth fixing member 151, but the present invention is not limited thereto.

[0085] In summary, for a connecting pipe sealing device and its installation method provided in this embodiment, the sealing shaft can be installed in a connecting pipe fixedly connected to a pressure vessel; the sealing ring group is arranged between the sealing shaft and the connecting pipe and is used to seal the connecting pipe during the hydrostatic test of the pressure vessel, and the sealing ring group includes a first sealing ring and a second sealing ring, which can increase the probability of successful sealing of the connecting pipe, thereby significantly improving the reliability and sealing efficiency of the connecting pipe sealing device; the guide sleeve can pre-compress the sealing ring group, so that the sealing ring group is not damaged by the blunt edge of the connecting pipe during the process of being inserted into the connecting pipe, thereby improving the installation efficiency of the connecting pipe sealing device. The connecting pipe sealing device provided in this embodiment also has the characteristics of simple structure, convenient disassembly and assembly, and low manufacturing cost, and at the same time has strong operability and versatility.

[0086] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A method for installing a pipe sealing device, characterized in that: The nozzle sealing device includes: A sealing shaft (110) installed in a nozzle (101) fixedly connected to a pressure vessel (100); A sealing ring set disposed between the sealing shaft (110) and the nozzle (101) for sealing the nozzle (101) during a hydrostatic test of the pressure vessel (100); and A guide sleeve (130) for pre-compressing the sealing ring set so that the sealing ring set is not damaged by the sharp edge of the nozzle (101) during the process of being inserted into the nozzle (101); The sealing ring set includes a first sealing ring (121) and a second sealing ring (122); The inner diameter of the guide sleeve (130) is smaller than the inner diameter of the nozzle (101), and the outer diameters of the first sealing ring (121) and the second sealing ring (122) sleeved with the guide sleeve (130) are both smaller than the inner diameter of the nozzle (101), so that the first sealing ring (121) and the second sealing ring (122) are not damaged by the sharp edge of the nozzle (101) when being inserted into the nozzle (101); The installation method of the nozzle sealing device includes: Orient the first end of the nozzle upward; Fix the first end of a fixing rod to one end of the shaft body of the sealing shaft close to the pressure vessel; Fix the first sealing ring in the sealing ring set to the first groove of the sealing shaft; Slip the guide sleeve over the first sealing ring to pre-compress the first sealing ring; Place the guide sleeve on the first end face of the nozzle, and place the shaft body of the sealing shaft in the nozzle, so that the sealing shaft and the first sealing ring and the fixing rod fixed on the sealing shaft fall into the nozzle under the action of gravity and seal the nozzle; Fix the inner conical ring of the conical ring assembly to the flange of the sealing shaft; the outer conical ring of the conical ring assembly is fixedly connected through the inner conical ring, and the outer side wall of the outer conical ring abuts against the inner side wall of the nozzle; and Fix a baffle to the fixing rod, and the baffle abuts against the second end face of the nozzle to fix the fixing rod and the sealing shaft connected to the fixing rod to the nozzle.

2. The method for installing the pipe sealing device according to claim 1, characterized in that: The sealing shaft (110) includes: A shaft body (1101) disposed between the first end and the second end of the nozzle (101); the first end and the second end of the nozzle (101) are oppositely arranged, and the second end of the nozzle (101) is fixedly connected to the pressure vessel (100); A top block (1102) disposed at one end of the shaft body (1101) away from the pressure vessel (100); and the side wall of the top block (1102) abuts against the inner side wall of the nozzle (101) so that one end of the sealing shaft (110) is fixedly connected to the first end of the nozzle (101); and The flange (1103) is arranged at one end of the shaft body (1101) close to the pressure vessel (100) and is fixedly connected to the tapered ring assembly; and the tapered ring assembly abuts against the inner wall of the nozzle (101), so that the other end of the sealing shaft (110) is fixedly connected to the second end of the nozzle (101) through the tapered ring assembly.

3. The installation method of the nozzle sealing device according to claim 2, characterized in that The side wall of the top block (1102) is provided with a first groove and a second groove; and the first groove and the second groove are arranged at intervals along the side wall of the top block (1102); The first sealing ring (121) is arranged in the first groove, and the second sealing ring (122) is arranged in the second groove.

4. The installation method of the takeover sealing device according to claim 2, characterized in that, The tapered ring assembly includes: An inner tapered ring (1104) fixedly connected to the flange (1103) of the sealing shaft (110); An outer tapered ring (1105) fixedly connected to the inner tapered ring (1104); and the outer side wall of the outer tapered ring (1105) abuts against the inner wall of the nozzle (101).

5. The installation method of the nozzle sealing device according to claim 3, characterized in that When the first sealing ring (121) is installed into the nozzle (101), the first sealing ring (121) is fixed in the first groove of the sealing shaft (110), and the guide sleeve (130) is sleeved on the first sealing ring (121); and the guide sleeve (130) is placed on the first end face of the nozzle (101), and the shaft body (1101) of the sealing shaft (110) is placed in the nozzle (101), so that the sealing shaft (110) and the first sealing ring (121) fixed on the sealing shaft (110) fall into the nozzle (101) under the action of gravity; When the second sealing ring (122) is installed into the nozzle (101), the guide sleeve (130) is sleeved on the second sealing ring (122); and the guide sleeve (130) is placed on the first end face of the nozzle (101), and the second sealing ring (122) is inserted into the second groove of the sealing shaft (110) that has been installed in the nozzle (101).

6. The installation method of the nozzle sealing device according to claim 3, characterized in that One end of the top block (1102) far from the shaft body (1101) is provided with a bevel, and the starting and ending points of the bevel are respectively located at the second groove and the end face of the top block (1102) far from the shaft body (1101), and are used for replacing the second sealing ring (122) that has been installed in the nozzle (101).

7. The installation method of the nozzle sealing device according to claim 6, characterized in that The range of the bevel angle is 10 degrees to 20 degrees.

8. The method for installing a pipe sealing device according to claim 6, characterized in that: The nozzle sealing device further includes: A fixing rod (140), the first end of which is fixedly connected to one end of the shaft body (1101) close to the pressure vessel (100), and the second end extends into the pressure vessel (100); A baffle plate (142) is arranged inside the pressure vessel (100) and fixedly connected to the fixed rod (140), and the baffle plate (142) abuts against the end face of the second end of the nozzle (101) for fixing the fixed rod (140) and the sealing shaft (110) connected to the fixed rod (140) on the nozzle (101).

9. The installation method of the nozzle sealing device according to claim 8, characterized in that, The nozzle sealing device further includes: A pressing plate (143) is arranged inside the pressure vessel (100) and fixedly connected to the fixed rod (140); and the pressing plate (143) abuts against the baffle plate (142) for fixing the baffle plate (142), the fixed rod (140) and the sealing shaft (110) connected to the fixed rod (140) on the nozzle (101); An end cover (150) is fixedly connected to the end of the top block (1102) away from the shaft body (1101); and an extension portion is provided at the end of the end cover (150) close to the top block (1102), and the extension portion is embedded in the gap formed by the groove of the top block (1102) and the inner side wall of the nozzle (101) to seal the first end of the nozzle (101).

10. The installation method of the nozzle sealing device according to claim 9, characterized in that, It further includes: Turn the first end of the nozzle downward; Fix the pressing plate to the fixed rod, and the pressing plate abuts against the baffle plate to fix the baffle plate, the fixed rod and the sealing shaft connected to the fixed rod on the nozzle; Set the guide sleeve on the second sealing ring of the sealing ring group to pre-compress the second sealing ring; Place the guide sleeve on the end face of the first end of the nozzle, and insert the second sealing ring into the second groove of the sealing shaft already installed in the nozzle to seal the nozzle; And Fix the end cover to the end of the top block away from the shaft body; and the extension portion of the end cover is embedded in the gap formed by the groove of the top block and the inner side wall of the nozzle to seal the first end of the nozzle.

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