Flange installation structure and installation method of a nuclear power blasting valve

Abstract

The present invention relates to the technical field of nuclear power equipment installation, and more specifically to a flange installation structure and installation method for a nuclear power blasting valve. Specifically, the flange installation structure for a nuclear power blasting valve includes a bolt assembly, which is used to install a pipeline flange on the flange connection part of the blasting valve, and the bolt assembly includes a fastening bolt; it also includes a protective sleeve, which is sleeved on the fastening bolt, and one end of the protective sleeve is connected to the blasting valve, and the other end passes through the pipeline flange, so that the protective sleeve constitutes a support structure acting on the pipeline flange. The flange installation structure of the nuclear power blasting valve in the present invention is proposed in view of the structure at the inlet and outlet of the nuclear power blasting valve, and can improve the protection of the fastening bolts in the flange installation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment installation, and more specifically, to a flange installation structure and an installation method for a nuclear power blasting valve. Background Art

[0002] Flange connection is an important connection method in pipeline construction. The flange generally set at the pipe end is called a pipeline flange, and the flange set at the inlet and outlet of the equipment is an inlet and outlet flange; the flange connection structure generally consists of a flange, a gasket, and bolts connected to each other. For existing flange connection structures, such as the flange connection structure in a butt-welding seal flange and its manufacturing process disclosed in a Chinese invention patent with the patent application number CN202110356194.9, and a steel pipe flange bolt internal thread connection structure disclosed in a Chinese invention patent with the patent application number CN201310694400.2, they are all connected by directly inserting and tightening bolts after fitting the flange's flange disks or fitting them through gaskets.

[0003] The blasting valve is a proprietary valve for AP1000 nuclear power technology. Pipeline flanges are also paired and connected to the inlet and outlet of the blasting valve. However, due to the particularity of the nuclear radiation substances in the blasting valve, the requirements for the connection structure between the blasting valve and the pipeline flange are not exactly the same as those of the existing connection structures. In actual use, if referring to the existing flange connection structure and only tightening the pipeline flange to the blasting valve through bolts, it is easy to cause the connection bolts to bend and deform. On the one hand, this will affect the alignment connection between the flange and the inlet and outlet of the blasting valve. On the other hand, during subsequent maintenance, disassembly, and assembly, it is very difficult to smoothly remove the bolts from the blasting valve and the flange. Therefore, it is necessary to design a flange installation structure suitable for the AP1000 nuclear power blasting valve according to the structure of the inlet and outlet of the blasting valve. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and the structure of the inlet and outlet of the blasting valve, and provide a flange installation structure for a nuclear power blasting valve to improve the protection of the fastening bolts in the flange installation structure; and based on the flange installation structure, provide a flange installation method for a nuclear power blasting valve, which can install the pipeline flange on the blasting valve in a guiding manner.

[0005] The technical solution measures of the present invention are as follows:

[0006] A flange installation structure of a nuclear power blasting valve, including a bolt assembly, the bolt assembly is used to install a pipeline flange on the flange connection part of the blasting valve, and the bolt assembly includes a fastening bolt; it also includes a protective sleeve, the protective sleeve is sleeved on the fastening bolt, and one end of the protective sleeve is connected to the blasting valve, and the other end passes through the pipeline flange, so that the protective sleeve forms a support structure acting on the pipeline flange.

[0007] In the above solution, by inserting one end of the protective sleeve sleeved on the fastening bolt into the blasting valve and the other end being inserted and connected to the pipeline flange, the protective sleeve forms a support column structure to provide a more stable support for the pipeline flange. In this way, not only the fastening bolt and the protective sleeve together form a multi-level support structure, improving the support stability of the pipeline flange; but also the protective sleeve serves as an external protective sleeve structure for the fastening bolt, which can share most of the support pressure, provide protection for the fastening bolt, and avoid the fastening bolt being the primary object of impact when the pipeline flange is offset or misaligned. The fastening bolt is mainly used for fastening connection, and the protective sleeve is mainly used for protective support.

[0008] As a preferred solution, one end of the protective sleeve connected to the blasting valve is an insertion end, the insertion end passes through the installation hole of the pipeline flange and is connected to the blasting valve, and the outer diameter dimension of the insertion end is smaller than the aperture dimension of the installation hole, and the outer surface of the insertion end is a guiding surface.

[0009] As a preferred solution, the other end of the protective sleeve is a limiting end, and the outer diameter dimension of the limiting end is larger than the aperture dimension of the installation hole, so that the limiting end and the flange connection part together form a clamping and limiting structure, and the clamping and limiting structure acts on the pipeline flange.

[0010] As a preferred solution, the limiting end is connected to the insertion end through an arc segment, or the limiting end is sequentially connected to the insertion end through an arc segment and a straight segment, and in the direction of the limiting end towards the insertion end, the outer diameter dimension of the arc segment gradually decreases; so that the protective sleeve forms a guiding structure when the pipeline flange is installed.

[0011] As a preferred solution, it further includes a threaded sleeve, the threaded sleeve is installed in the installation groove of the blasting valve, the insertion end and the fastening bolt are both connected to the threaded sleeve, and are connected to the installation groove through the threaded sleeve.

[0012] As a preferred solution, a limiting part is provided between the straight segment and the arc segment, and a stepped structure is formed between the limiting part and the insertion end. By pressing the limiting part against the end surface of the threaded sleeve facing the pipeline flange, the limiting part constitutes a limiting structure acting on the threaded sleeve.

[0013] As a preferred solution, the threaded sleeve is installed in the installation groove through a threaded connection structure.

[0014] As a preferred solution, the connection structure between the pipe flange and the blasting valve includes three flange installation structures, and the three flange installation structures are evenly distributed.

[0015] An installation method applicable to the flange installation structure of the nuclear power blasting valve, the steps of the installation method include:

[0016] S1: Install the threaded sleeve in the installation groove of the blasting valve;

[0017] S2: Lift and install the blasting valve to the installation position opposite to the pipe flange;

[0018] S3: Insert one end of the fastening bolt through the installation hole of the pipe flange and connect it to the threaded sleeve;

[0019] S4: Sequentially sleeve the protective sleeve, fastening gasket, and fastening nut on the fastening bolt from the other end of the fastening bolt, and make the insertion end of the protective sleeve face the blasting valve;

[0020] S5: Rotate the fastening nut, and drive the pipe flange to move towards the blasting valve in a guiding manner through the protective sleeve until the pipe flange is connected to the flange connection part of the blasting valve.

[0021] As a preferred solution, in S1, the three threaded sleeves are installed in the blasting valve at equal intervals, and each threaded sleeve is connected with a fastening bolt; in S5, the fastening nuts on the three fastening bolts are twisted synchronously to drive the pipe flange to move towards the blasting valve in a guiding manner through the three protective sleeves synchronously.

[0022] The main beneficial effects of the present invention are as follows:

[0023] 1. By sleeving a protective sleeve outside the fastening bolt and connecting the protective sleeve to the blasting valve to form a multi-level support structure, and providing anti-bending protection for the fastening bolt through the protective sleeve.

[0024] 2. The protective sleeve is set as a guiding structure suitable for flange installation. While ensuring stable support for the pipe flange, the pipe flange can be installed on the blasting valve more smoothly and accurately in terms of alignment. At the same time, the installation efficiency of the pipe flange positioning installation can be improved, the installation time can be reduced, and thus the radiation dose received by the working group members can be reduced.

[0025] 3. By installing a threaded sleeve on the blasting valve to adapt and connect the protective sleeve and the fastening bolt, it is possible to install a suitable threaded sleeve for the case where fastening bolts of different sizes need to be installed, improving the diversity of available pipe flanges and bolt assemblies.

[0026] 4. A stepped contact structure is formed between the protective sleeve and the threaded sleeve, increasing the connection area between the protective sleeve and the threaded sleeve, enabling the protective sleeve to be more stably connected to the threaded sleeve, and thus providing a more stable support for the pipe flange.

[0027] 5. By synchronously guiding the installation of the pipe flange through three equally spaced protective sleeves, the stability during the installation of the pipe flange and the accuracy of alignment installation are further improved.

[0028] Further or more detailed beneficial effects will be described in combination with specific embodiments in the detailed implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following further describes the present invention with reference to the drawings:

[0030] Figure 1 It is a schematic assembly structure diagram of the present invention.

[0031] Figure 2 It is another schematic assembly structure diagram of the present invention.

[0032] Figure 3 It is a schematic structure diagram of the protective sleeve of the present invention.

[0033] Figure 4 It is a schematic structure diagram of the threaded sleeve of the present invention.

[0034] Figure 5 It is a schematic overall installation structure diagram of the present invention.

[0035] As shown in the figure: bolt assembly 1, fastening bolt 101, fastening nut 102, fastening gasket 103, pipe flange 2, mounting hole 201, blasting valve 3, flange connection part 301, mounting groove 302, protective sleeve 4, insertion end 401, limiting end 402, arc segment 403, straight segment 404, limiting part 405, threaded sleeve 5, positioning cavity 501, fastening cavity 502, mounting cavity 503. DETAILED IMPLEMENTATION MANNER

[0036] The following is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Additionally, in the embodiments of the present invention, the terms "vertical", "horizontal", "top", "bottom", "front", "rear", "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the attached... Figure 1The orientation or positional relationship shown, or the orientation or positional relationship in which the product is usually placed during use, is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation on the present invention. It should be further noted that unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" in the description should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] It should be noted in advance that: the flange is an important connection structure in pipeline construction, mainly used to connect the pipeline with the equipment, and then transport gas or liquid; the current flange structure generally directly installs the flange in a large area or by installing a gasket to ensure the stability of the connection. However, for the rupture valve 3, the above-mentioned installation method of fitting the flange in a large area is not applicable because there is a flange connection part 301 at the inlet and outlet of the rupture valve 3 that needs to be flange-connected. The flange connection part 301 is a raised pipeline structure with an air inlet or outlet channel inside. When installing the pipeline flange 2, the pipeline flange 2 needs to be installed on the flange connection part 301 and the pipeline flange 2 needs to be aligned and connected with the flange connection part 301.

[0038] The reason for setting the flange connection part 301 is as follows: The rupture disc 3 is used in the AP1000 nuclear power technology, and there are substances with nuclear irradiation in the rupture disc 3. Therefore, on the basis of ensuring the firm connection between the pipe flange 2 and the rupture disc 3, the connection requirements between the pipe flange 2 and the rupture disc 3 mainly lie in how to improve the sealing effect at the connection and how to reduce the leakage of irradiation during the disassembly process. Based on the above requirements, the inventor sets the flange connection part 301 at the inlet and outlet of the rupture disc 3, and there are two advantages in this way: On the one hand, connecting the pipe flange 2 to the flange connection part 301 instead of directly fitting and installing it on the rupture disc 3 can reduce the contact area during connection. When the tightening pressure is certain, less contact area can form a greater pressure, and thus better sealing effect can be ensured. Therefore, while keeping the connection surface stable, it is necessary to relatively reduce the direct contact area between the rupture disc 3 and the pipe flange 2. On the other hand, through the flange connection part 301, the distance between the irradiated substances in the rupture disc 3 and the inlet and outlet can be lengthened, which can increase the difficulty of irradiation leakage. At the same time, during the process of irradiation leakage, the inner wall of the flange connection part 301 can block and attenuate the irradiation to a certain extent, which can further weaken the irradiation leakage and thus reduce the irradiation dose received by the working group members.

[0039] Based on the above description, the flange connection part 301 should preferably be a pipe structure with a small wall thickness and a long length. Of course, in actual applications, it needs to be set according to the specific weight, size, etc. of the pipe flange 2, fully considering the strength of the structure and the connection stability. Under the condition of the structure limitation of the flange connection part 301, when the pipe flange 2 is installed and connected to the flange connection part 301 in the present invention, there is a relatively large gap between the pipe flange 2 and the rupture disc 3. At this time, if only the fastening bolt 101 is used for connection, the following situation will occur: One end of the fastening bolt 101 is connected to the rupture disc 3, the other end is connected to the pipe flange 2, and the middle is in a suspended state. When there is a misalignment or offset in the connection between the pipe flange 2 and the rupture disc 3, or when the rupture disc 3 is impacted during operation, it is easy for the bolt assembly 1 to bend and deform. Therefore, in order to improve the connection stability between the pipe flange 2 and the rupture disc 3 and improve the protection of the fastening bolt 101 on the premise of ensuring the structure of the flange connection part 301, the inventor proposes a flange installation structure for a nuclear power rupture disc, and the present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] As the first embodiment of the present invention, referring to the attached Figure 1, a flange installation structure of a nuclear power blasting valve, including a bolt assembly 1, where the bolt assembly 1 is used to install a pipe flange 2 on the flange connection part 301 of the blasting valve 3; specifically, the bolt assembly 1 includes a fastening bolt 101, a fastening nut 102, and a fastening gasket 103. During actual installation, one end of the fastening bolt 101 is inserted through the installation hole 201 of the pipe flange 2 and connected to the blasting valve 3 through a threaded connection structure, and then the pipe flange 2 is clamped and installed on the blasting valve 3 through the fastening nut 102 and the fastening gasket 103. This embodiment also includes a protective sleeve 4, which is sleeved on the fastening bolt 101, and one end of the protective sleeve 4 is connected to the blasting valve 3. Refer to the attached Figure 1 As shown, in this embodiment, it is preferably to insert one end of the protective sleeve 4 into the blasting valve 3 for convenient disassembly and assembly. Of course, one end of the protective sleeve 4 can also be connected to the blasting valve 3 through a threaded connection structure; the other end of the protective sleeve 4 passes through the pipe flange 2, so that the protective sleeve 4 forms a support structure acting on the pipe flange 2; in this embodiment, it is preferably to completely insert the other end of the protective sleeve 4 through the installation hole 201, which can improve the support effect and increase the protection area for the fastening bolt 101.

[0041] It should be further noted that when problems such as misalignment and non - coaxiality occur between the pipe flange 2 and the flange connection part 301, it will lead to an increase in the overall installation time, and the increase in installation time means that the staff is exposed to radiation for a longer time; therefore, in order to improve the installation efficiency and installation accuracy of the pipe flange 2, the protective sleeve 4 in this embodiment is set as a guiding structure for the installation of the pipe flange 2. The following will be combined with the attached Figure 3 to elaborate on the protective sleeve 4 of the guiding structure in detail.

[0042] Preferably, one end of the protection kit 4 connected to the bursting valve 3 is an inserted end 401. The inserted end 401 penetrates through the mounting hole 201 of the pipe flange 2 and is connected to the bursting valve 3. The outer diameter of the inserted end 401 is smaller than the aperture of the mounting hole 201. In this embodiment, the protection kit 4 is preferably a rotating body structure similar to a cylinder. The outer surface of the inserted end 401 is a guiding surface. Specifically, the guiding surface means that the outer surface of the inserted end 401 is an inclined surface or an arc surface, and in the direction of the protection kit 4 towards the bursting valve 3, the outer diameter of the inserted end 401 gradually decreases. Further, the other end of the protection kit 4 is a limiting end 402, and the outer diameter of the limiting end 402 is larger than the aperture of the mounting hole 201, so that the limiting end 402 and the flange connection part 301 together form a clamping and limiting structure, and the clamping and limiting structure acts on the pipe flange 2. To facilitate guiding the pipe flange 2, in this embodiment, the limiting end 402 is connected to the inserted end 401 through an arc segment 403, or the limiting end 402 is connected to the inserted end 401 through an arc segment 403 and a straight segment 404 in sequence. The outer contour of the arc segment 403 is preferably a smooth curve structure, and in the direction of the limiting end 402 towards the inserted end 401, the outer diameter of the arc segment 403 gradually decreases, so that the protection kit 4 forms a guiding structure when the pipe flange 2 is installed.

[0043] Specifically, during actual installation, since the protective kit 4 needs to be installed, the size of the fastening bolt 101 is smaller than the aperture size of the mounting hole 201. Therefore, one end of the fastening bolt 101 can be conveniently and quickly passed through the mounting hole 201 and connected to the blasting valve 3 through a threaded connection structure. At this time, the protective kit 4 is sleeved on the fastening bolt 101 from the other end of the fastening bolt 101. As the protective kit 4 is pushed towards the blasting valve 3, the insertion end 401 of the protective kit 4 will first pass through the mounting hole 201. As the protective kit 4 continues to move, the arc segment 403 will contact the inner wall of the mounting hole 201. Then, as the protective kit 4 moves further, while driving the pipe flange 2 towards the flange connection part 301, it will also push the pipe flange 2 to move up and down relative to the protective kit 4 until the pipe flange 2 is connected to the flange connection part 301 of the blasting valve 3. At this time, preferably, the insertion end 401 of the protective kit 4 is also adaptively installed in the blasting valve 3, aligning the mounting hole 201 of the pipe flange 2, the protective kit 4, and the fastening bolt 101, thus completing the guiding alignment of the pipe flange 2. Specifically, in this embodiment, preferably, the central axes of the mounting hole 201, the protective kit 4, and the fastening bolt 101 are collinear. Finally, the pipe flange 2 is horizontally fastened to the flange connection part 301 through the fastening nut 102 and the fastening gasket 103 to complete the installation. Of course, for the pipe flange 2 with a relatively large misalignment degree, when the insertion end 401 passes through the mounting hole 201, it will conduct a preliminary guiding for the pipe flange 2.

[0044] It should be additionally noted that: in the above embodiment, the fastening bolt 101 and the protective kit 4 are directly connected to the blasting valve 3. Since it is relatively difficult to groove on the blasting valve 3 to form the installation groove 302 or change the structural dimensions of the installation groove 302, once the structure is formed, the blasting valve 3 can only be installed with a fastening bolt 101 of one size structure and the corresponding pipe flange 2, and it is impossible to adaptively select fastening bolts 101 of different size structures according to requirements. To solve the above problems and increase the diversity of the available fastening bolts 101, the inventor proposed Embodiment 2 based on Embodiment 1.

[0045] As Embodiment 2 of the present invention, based on Embodiment 1, refer to the attached Figure 2 and the attached Figure 4, further comprising a threaded sleeve 5, the threaded sleeve 5 is installed in the installation groove 302 of the blasting valve 3, the insertion end 401 and the fastening bolt 101 are both connected to the threaded sleeve 5, and are connected in the installation groove 302 through the threaded sleeve 5. Specifically, the interior of the threaded sleeve 5 is a groove structure or a through-hole structure. In the direction of the protective sleeve 4 towards the blasting valve 2, there are a positioning cavity 501, a fastening cavity 502 and an installation cavity 503. Among them, the inner contour of the positioning cavity 501 is adapted to the outer contour of the insertion end 401 of the protective sleeve 4 for adaptively inserting the insertion end 401; the inner contour of the fastening cavity 502 is adapted to the outer contour of one end of the fastening bolt 101 and is provided with an internal thread structure for adaptively thread-connecting the fastening bolt 301. Further, in order to facilitate replacing the threaded sleeve 5 according to the size of the selected fastening bolt 101, in this embodiment, the threaded sleeve 5 is installed in the installation groove 302 through a threaded connection structure, and the installation cavity 503 is used to adaptively connect the tool for disassembling / assembling the threaded sleeve 5; specifically, the inner wall of the installation cavity 503 can be a hexagonal hole structure adapted to an inner hexagonal wrench, or a cross slot structure adapted to a screwdriver is provided in the installation cavity 503.

[0046] Preferably, in order to increase the connection area between the protective sleeve 4 and the threaded sleeve 5, increase the lateral support area between the protective sleeve 4 and the threaded sleeve 5, and improve the lateral support effect of the threaded sleeve 5 on the protective sleeve 4; in this embodiment, a limiting portion 405 is provided between the insertion end 401 and the straight line segment 404, and a stepped structure is formed between the limiting portion 405 and the insertion end 401. By pressing the limiting portion 405 against the end surface of the threaded sleeve 5 facing the pipe flange 2, the limiting portion 405 constitutes a limiting structure acting on the threaded sleeve 5. Further, the limiting portion 405 is preferably fitted and connected to the end surface of the threaded sleeve 5 facing the pipe flange 2.

[0047] It should be further noted that referring to the appendix Figure 5, in an AP1000 nuclear power plant, connecting the pipe flange 2 to the rupture disc 3 requires a large number of bolt assemblies 1. If the protective kits 4 are added to each bolt assembly 1 to form the flange installation structure, the installation cost will increase. Therefore, selective installation can be carried out while ensuring the stability of the installation mechanism. In this embodiment, the connection structure between the pipe flange 2 and the rupture disc 3 includes three flange installation structures, and the three flange installation structures are evenly spaced; for the remaining positions that need to be connected, that is, in the remaining mounting holes 201, the connection can be directly completed by installing bolt assemblies 1 with appropriate sizes. In this way, an equilateral triangle installation structure with good stability is formed, which ensures the connection stability between the pipe flange 2 and the rupture disc 3, protects the fastening bolts 101, facilitates the guiding installation of the pipe flange 2, reduces the required number of protective kits 4, and lowers the installation cost.

[0048] An installation method based on the nuclear power rupture disc flange installation structure in Embodiment 2, the steps of the installation method include:

[0049] S1: Install the threaded sleeve 5 in the installation groove 302 of the rupture disc 3;

[0050] S2: Lift and install the rupture disc 3 to the installation position opposite to the pipe flange 2;

[0051] S3: Insert one end of the fastening bolt 101 through the mounting hole 201 of the pipe flange 2 and connect it to the threaded sleeve 5;

[0052] S4: Sequentially sleeve the protective kit 4, the fastening gasket 103, and the fastening nut 102 onto the fastening bolt 101 from the other end of the fastening bolt 101, and make the insertion end 401 of the protective kit 4 face the rupture disc 3;

[0053] S5: Rotate the fastening nut 102 to push the protective kit 4 towards the rupture disc 3, and drive the pipe flange 2 to move towards the rupture disc 3 in a guiding manner through the protective kit 4 until the pipe flange 2 is connected to the flange connection part 301 of the rupture disc 3. The term "in a guiding manner" here means that when the protective kit 4 drives the pipe flange 2 to move towards the rupture disc 3, it will drive the pipe flange 2 to move relative to the protective kit 4 until the mounting hole 201 of the pipe flange 2, the protective kit 4, and the fastening bolt 101 are in relative alignment, completing the guiding alignment of the pipe flange 2.

[0054] Preferably, in order to more stably guide the installation of the pipeline flange 2, in this embodiment, in S1, the three threaded sleeves 5 are equidistantly installed in the bursting valve 3, and each threaded sleeve 5 is connected with a fastening bolt 101; in S5, the fastening nuts 102 on the three fastening bolts 101 are twisted synchronously to synchronously drive the pipeline flange 2 to move towards the bursting valve 3 in a guiding manner through the three protective sleeves 4.

[0055] It should be independently noted that: in the above embodiment, after the guiding installation, the protective sleeve 4 can be directly installed in the flange installation structure and serve as a part of the flange installation structure. However, for a flange installation structure where the gap between the pipeline flange 2 and the bursting valve 3 is small and the installation can be ensured to be stable only by the fastening bolt 101, the protective sleeve 4 can be used simply as a guiding installation structure, and its specific installation method includes:

[0056] S1: Install the three threaded sleeves 5 in different installation grooves 302 on the bursting valve 3 respectively, and keep the three threaded sleeves 5 equidistantly distributed.

[0057] S2: Lift the bursting valve 3 to the installation position opposite to the pipeline flange 2.

[0058] S3: Fit and install a fastening bolt 101 on each threaded sleeve 5, that is, insert one end of the fastening bolt 101 through the installation hole 201 of the pipeline flange 2 and connect it in the threaded sleeve 5.

[0059] S4: A protective sleeve 4, a fastening gasket 103, and a fastening nut 102 are sleeved on each fastening bolt 101; specifically, the protective sleeve 4, the fastening gasket 103, and the fastening nut 102 are sequentially sleeved on the fastening bolt 101 from the other end of the fastening bolt 101, and the insertion end 401 of the protective sleeve 4 faces the bursting valve 3.

[0060] S5: Synchronously rotate the three fastening nuts 102 to synchronously drive the pipeline flange 2 to move towards the bursting valve 3 in a guiding manner through the three protective sleeves 4 until the insertion end 401 of the protective sleeve 4 is fitly installed in the positioning cavity 501 of the threaded sleeve 5.

[0061] S6: Install bolt assemblies 1 with appropriate sizes in the remaining installation holes 201, and the fastening bolts 101 in the bolt assemblies 1 are directly connected to the corresponding installation grooves 302 through a threaded connection structure to complete the connection between the pipeline flange 2 and the bursting valve 3.

[0062] S7: Reverse the tightening bolt 101 to remove both the bolt assembly 1 and the protective sleeve 4, and then remove the threaded sleeve 5;

[0063] S8: At the position of the installation hole 201 where the removal is completed, refer to S6 to install the bolt assembly 1 with the appropriate size to complete the overall installation.

[0064] In the description of this specification, the descriptions with reference to terms such as "embodiment", "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0065] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flange installation structure of a nuclear power blasting valve, comprising a bolt assembly (1), characterized in that: The bolt assembly (1) is used to install the pipeline flange (2) on the flange connection part (301) of the blast valve (3), and the bolt assembly (1) includes a fastening bolt (101); It further includes a protective sleeve (4). The protective sleeve (4) is sleeved on the fastening bolt (101), and one end of the protective sleeve (4) is connected to the blast valve (3), and the other end passes through the pipeline flange (2), so that the protective sleeve (4) constitutes a support structure acting on the pipeline flange (2); One end of the protective sleeve (4) connected to the blast valve (3) is an insertion end (401). The insertion end (401) penetrates through the installation hole (201) of the pipeline flange (2) and is connected to the blast valve (3). The outer diameter dimension of the insertion end (401) is smaller than the aperture dimension of the installation hole (201), and the outer surface of the insertion end (401) is a guiding surface; The other end of the protective sleeve (4) is a limiting end (402), and the outer diameter dimension of the limiting end (402) is larger than the aperture dimension of the installation hole (201), so that the limiting end (402) and the flange connection part (301) together constitute a clamping and limiting structure, and the clamping and limiting structure acts on the pipeline flange (2); The limiting end (402) is connected to the insertion end (401) through an arc segment (403), or the limiting end (402) is sequentially connected to the insertion end (401) through an arc segment (403) and a straight segment (404). In the direction of the limiting end (402) facing the insertion end (401), the outer diameter dimension of the arc segment (403) gradually decreases; so that the protective sleeve (4) constitutes a guiding structure during the installation of the pipeline flange (2); It further includes a threaded sleeve (5). The threaded sleeve (5) is installed in the installation groove (302) of the blast valve (3). The insertion end (401) and the fastening bolt (101) are both connected to the threaded sleeve (5) and are connected to the installation groove (302) through the threaded sleeve (5).

2. The flange installation structure according to claim 1, characterized in that: A limiting part (405) is provided between the insertion end (401) and the straight segment (404). A stepped structure is formed between the limiting part (405) and the insertion end (401). By pressing the limiting part (405) against the end face of the threaded sleeve (5) on the side facing the pipeline flange (2), the limiting part (405) constitutes a limiting structure acting on the threaded sleeve (5).

3. The flange installation structure according to claim 2, characterized in that: The threaded sleeve (5) is installed in the installation groove (302) through a threaded connection structure.

4. The flange installation structure according to claim 3, characterized in that: The connection structure between the pipeline flange (2) and the blast valve (3) includes three flange installation structures, and the three flange installation structures are evenly distributed.

5. An installation method for the flange installation structure of the nuclear power blasting valve applicable to claim 4, characterized in that: The steps of the installation method include: S1: Install the threaded sleeve (5) in the installation groove (302) of the blast valve (3); S2: Lift the blast valve (3) to the installation position opposite to the pipeline flange (2); S3: Insert one end of the fastening bolt (101) through the mounting hole (201) of the pipeline flange (2) and connect it to the threaded sleeve (5); S4: Successively sleeve the protective kit (4), fastening gasket (103), and fastening nut (102) onto the fastening bolt (101) from the other end of the fastening bolt (101), and make the insertion end (401) of the protective kit (4) face the blasting valve (3); S5: Rotate the fastening nut (102), and drive the pipeline flange (2) to move towards the blasting valve (3) in a guiding manner through the protective kit (4) until the pipeline flange (2) is connected to the flange connection part (301) of the blasting valve (3).

6. The installation method according to claim 5, characterized in that: In S1, the three threaded sleeves (5) are installed in the blasting valve (3) at equal intervals, and each threaded sleeve (5) is connected with a fastening bolt (101); in S5, twist the fastening nuts (102) on the three fastening bolts (101) synchronously to drive the pipeline flange (2) to move towards the blasting valve (3) in a guiding manner through the three protective kits (4) synchronously.

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