A device and method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel.

Abstract

This invention provides a device and method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel. The device includes a vessel support, a leveling device, and a steel structure support. The nozzle of the pressure vessel is mounted on a nozzle support of the vessel support. Each nozzle of the pressure vessel corresponds to one leveling device, which is located below the vessel support and mounted on the steel structure support. This invention utilizes the slight oscillation of the nozzle spherical hinge formed by the nozzle support and the ball joint support to ensure uniform force on the nozzle. The leveling device can quickly and effortlessly adjust the height of each nozzle. The thrust of the leveling device does not directly act on the pressure vessel nozzle, which is beneficial for protecting the pressure vessel nozzle.

Description

Technical Field

[0001] This invention pertains to reactor installation design technology, specifically relating to a device and method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel. Background Technology

[0002] The reactor pressure vessel is a key piece of equipment in a nuclear power plant and reactor. Before installing the in-core components, the flange sealing surface of the pressure vessel needs to be adjusted to the required level for the installation of the in-core components to ensure the smooth installation of the in-core components.

[0003] The lower part of the nozzle of the nuclear power plant reactor pressure vessel is flat. During the installation of the reactor pressure vessel, the height of the nozzle is adjusted by using the set screw installed below the nozzle, so as to adjust the level of the sealing surface of the pressure vessel flange.

[0004] When the nozzle of the reactor pressure vessel is circular, the above-mentioned set screw structure cannot provide stable support for the circular nozzle. The design, manufacturing and installation technology of the reactor pressure vessel is not mature, and it is necessary to determine a reasonable flange sealing surface level value through repeated trial assembly of reactor internal components. The set screw structure cannot meet the needs of rapid adjustment due to its disadvantages such as long adjustment time and inconvenience. Therefore, a new type of reactor pressure vessel flange sealing surface level adjustment device is needed. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a device and method for adjusting the level of the flange sealing surface of a reactor pressure vessel, thereby quickly and effortlessly adjusting the level of the flange sealing surface.

[0006] The technical solution of the present invention is as follows: A reactor pressure vessel flange sealing surface leveling adjustment device includes a vessel support, a leveling device and a steel structure support. The nozzle of the pressure vessel is located on the nozzle support of the vessel support. Each nozzle of the pressure vessel corresponds to one leveling device. The leveling device is located below the vessel support and is installed on the steel structure support.

[0007] Furthermore, in the reactor pressure vessel flange sealing surface level adjustment device described above, the lower part of the nozzle support of the vessel support is a spherical convex structure, a first ball hinge support is provided below the nozzle support, and the upper part of the first ball hinge support is a spherical concave structure. After the spherical convex surface of the nozzle support and the spherical concave surface of the first ball hinge support are assembled, a nozzle spherical hinge is formed. The first ball hinge support is installed on the annular support by bolts.

[0008] Furthermore, the upper surface of the nozzle support has a semi-circular groove that can fit into the nozzle of the pressure vessel.

[0009] Furthermore, the bolt holes on the annular support member that are installed with the first ball joint support are elongated holes, which can adjust the installation position of the nozzle ball joint according to the actual position of the pressure vessel nozzle.

[0010] Furthermore, in the reactor pressure vessel flange sealing surface leveling adjustment device described above, the leveling device includes a second ball hinge support and a lifting device. The lower part of the second ball hinge support is a spherical concave structure, and the upper part of the lifting device is a spherical convex structure. The spherical concave structure at the lower part of the second ball hinge support and the spherical convex structure at the upper part of the lifting device constitute a spherical hinge of the lifting device.

[0011] Furthermore, the second ball joint support is installed below the annular support at the nozzle position of the pressure vessel.

[0012] Furthermore, the lifting device may, but is not limited to, use a jack, hydraulic cylinder, or electric cylinder, and the lifting device is equipped with a mechanical locking mechanism.

[0013] Furthermore, in the reactor pressure vessel flange sealing surface level adjustment device described above, the steel structure support is equipped with a limiting device for limiting the position of the pressure vessel.

[0014] Furthermore, the limiting device is a screw and nut structure, and the part in contact with the pressure vessel is made of flexible material.

[0015] A method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel using the above-mentioned device includes:

[0016] Preliminary leveling: Before the pressure vessel is hoisted in, the vessel support base is preliminarily leveled using a leveling device to ensure that the upper surface of the annular support component of the vessel support base is horizontal;

[0017] Container positioning: Hoist the pressure vessel into the reactor pressure vessel flange sealing surface level adjustment device so that the nozzle of the pressure vessel falls on the nozzle support of the vessel support base, and the nozzle fits into the semi-circular groove of the nozzle support base.

[0018] Final leveling: Measure the levelness of the flange sealing surface and adjust the height of each lifting device until the levelness of the flange sealing surface meets the requirements; then constrain the position of the pressure vessel by using the mechanical locking mechanism of the lifting device and the limiting device of the steel structure support.

[0019] Furthermore, in the reactor pressure vessel flange sealing surface leveling adjustment method described above, during the vessel placement step, the position of the pressure vessel nozzle centerline is first measured, and the installation positions of the nozzle support and the first ball joint support on the annular support are adjusted so that the centerline of the semi-circular groove of the nozzle support coincides with the centerline of the pressure vessel nozzle. After the adjustment is completed, the first ball joint support is fixed with bolts, and then the pressure vessel is slowly lowered so that the nozzle is embedded in the semi-circular groove of the nozzle support.

[0020] The beneficial effects of this invention are as follows: The reactor pressure vessel flange sealing surface leveling device provided by this invention adopts a nozzle support with a semi-circular groove. The nozzle support and the ball joint support form a small-amplitude swing of the nozzle spherical hinge, ensuring complete contact between the semi-circular groove and the nozzle, and ensuring uniform force on the nozzle. The thrust of the leveling device does not directly act on the pressure vessel nozzle, which is beneficial for protecting the pressure vessel nozzle. The small-amplitude swing of the spherical hinge of the lifting device can adapt to the height differences generated by each lifting device during the leveling process. The lifting device can adopt structures such as hydraulic cylinders and electric cylinders, which can quickly and effortlessly adjust the height of each nozzle. After the reactor pressure vessel flange sealing surface is leveled, the mechanical locking function of the lifting device and the container limiting device are used to limit the reactor pressure vessel, preventing changes in the levelness of the sealing surface. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the reactor pressure vessel flange sealing surface level adjustment device and the pressure vessel after assembly in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the reactor pressure vessel flange sealing surface leveling adjustment device in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the nozzle support and the first ball joint support in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the lifting device and the second ball joint support structure in an embodiment of the present invention.

[0025] In the diagram: 1. Container support; 2. Leveling device; 3. Steel structure support; 4. Pressure vessel flange sealing surface; 5. Nozzle; 11. Nozzle support; 12. First ball joint support; 13. Annular support; 21. Second ball joint support; 22. Lifting device; 31. Limiting device; 111. Semi-circular groove; 112. Nozzle ball joint; 211. Lifting device ball joint. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figure 1 As shown, the present invention provides a device for adjusting the level of the flange sealing surface of a reactor pressure vessel, including a vessel support 1, a leveling device 2, and a steel structure support 3. The pressure vessel is hoisted into the adjustment device, and the nozzle 5 of the pressure vessel is embedded in the vessel support 1. The level of the flange sealing surface 4 of the pressure vessel is adjusted by the leveling device 2.

[0028] like Figure 2 As shown, the container support 1 includes a nozzle support 11, a first ball joint support 12, and an annular support 13. The convex structure at the lower part of the nozzle support 11 and the concave structure at the upper part of the first ball joint support 12 form a nozzle ball joint. The first ball joint support 12 is bolted to the annular support 13.

[0029] like Figure 3 As shown, the upper surface of the nozzle support has a semi-circular groove 111, which meets the installation requirements of a circular nozzle. After assembly with the first ball joint support, the nozzle support forms a spherical hinge 112. The slight oscillation of the spherical hinge 112 ensures complete contact between the semi-circular groove 111 and the outer wall of the nozzle, guaranteeing uniform force distribution on the nozzle. The first ball joint support 12 is bolted to the annular support 13. The bolt holes on the annular support 13 are elongated holes, allowing the bolts to be adjusted within these holes. This allows for adjustment of the nozzle support 11's installation position according to the actual position of the pressure vessel nozzle, ensuring proper contact between the nozzle and the semi-circular groove 111.

[0030] like Figure 2 As shown, the leveling device includes a second ball joint support 21 and a lifting device 22. The concave structure at the lower part of the second ball joint support 21 and the convex structure of the lifting device 22 form a spherical hinge for the lifting device. The second ball joint support 21 is installed below the annular support member 13, and the lifting device 22 is installed on the steel structure support 3. The thrust of the leveling device does not directly act on the pressure vessel nozzle, which helps to protect the pressure vessel nozzle and ensures that each nozzle is subjected to uniform force.

[0031] like Figure 4 As shown, the second ball joint support 21 and the lifting device 22 form a lifting device ball joint 211. The slight swing of the lifting device ball joint 211 adapts to the height difference generated by the lifting of each lifting device 22.

[0032] The lifting device 22 can adopt a structure such as a jack, hydraulic cylinder, or electric cylinder; the lifting device 22 is equipped with a mechanical locking mechanism, and a suitable mechanical locking mechanism can be designed for various different lifting device structures. After the horizontality of the pressure vessel flange sealing surface is adjusted, the mechanical locking function of the lifting device 22 is used to limit the pressure vessel.

[0033] like Figure 2 As shown, the steel structure support 3 is equipped with a container limiting device 31. The limiting device is a screw and nut structure, and the part in contact with the pressure vessel is made of flexible material. After the levelness of the pressure vessel flange sealing surface is adjusted, the screw of the container limiting device 31 is rotated to make the container limiting device contact the pressure vessel, thereby limiting the pressure vessel.

[0034] The present invention further provides a method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel using the above-mentioned device, comprising the following steps:

[0035] Preliminary leveling steps: Use leveling device 2 to perform preliminary leveling on container support 1 to ensure that the upper surface of the annular support 13 of container support 1 is horizontal;

[0036] Container placement steps: Hoist the reactor pressure vessel into the reactor pressure vessel flange sealing surface level adjustment device; measure the position of the pressure vessel nozzle centerline, and adjust the installation position of the nozzle support 11 and the first ball joint support 12 on the annular support 13 so that the centerline of the semi-circular groove 111 of the nozzle support coincides with the centerline of the reactor pressure vessel nozzle; after adjustment, fix the first ball joint support 12 to the annular support 13 with bolts; slowly lower the pressure vessel so that the nozzle is slowly inserted into the semi-circular groove 111 of the nozzle support 11, so that the nozzle fits into the semi-circular groove 111.

[0037] Final leveling steps: Measure the horizontality of the flange sealing surface, adjust the lifting device 22 of the leveling device 2 until the flange sealing surface reaches the required horizontality; after the flange sealing surface horizontality adjustment is completed, activate the mechanical locking function of the lifting device 22, and rotate the screw of the container limiting device 31 to make the container limiting device contact the pressure vessel, thus limiting the pressure vessel. This completes the process of adjusting the horizontality of the reactor pressure vessel flange sealing surface.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for adjusting the levelness of the flange sealing surface of a reactor pressure vessel, characterized in that, The pressure vessel includes a container support (1), a leveling device (2), and a steel structure support (3). The nozzle (5) of the pressure vessel is located on the nozzle support (11) of the container support (1). Each nozzle (5) of the pressure vessel corresponds to one leveling device (2). The leveling device (2) is located below the container support (1) and is installed on the steel structure support (3). The lower part of the nozzle support (11) of the container support (1) is a spherical convex structure, and the upper part of the first ball joint support (12) is a spherical concave structure. The spherical convex surface of the nozzle support (11) After being assembled with the spherical concave surface of the first ball joint support (12), a nozzle spherical hinge (112) is formed. The first ball joint support (12) is installed on the annular support (13) by bolts. The leveling device (2) includes a second ball joint support (21) and a lifting device (22). The lower part of the second ball joint support (21) is a spherical concave surface structure, and the upper part of the lifting device is a spherical convex surface structure. The spherical concave surface structure of the lower part of the second ball joint support (21) and the spherical convex surface structure of the upper part of the lifting device (22) form the lifting device spherical hinge (211).

2. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 1, characterized in that, The upper surface of the nozzle support (11) has a semi-circular groove (111) that can fit with the nozzle (5) of the pressure vessel.

3. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 1, characterized in that, The bolt holes on the annular support (13) that are installed with the first ball joint support (12) are elongated holes, which can adjust the installation position of the ball joint (112) of the nozzle according to the actual position of the nozzle (5) of the pressure vessel.

4. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 1, characterized in that, The second ball joint support (21) is installed below the annular support (13) at the position of the nozzle (5) of the pressure vessel.

5. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 1, characterized in that, The lifting device (22) may, but is not limited to, use a jack, a hydraulic cylinder, or an electric cylinder, and the lifting device is equipped with a mechanical locking mechanism.

6. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 1, characterized in that, The steel structure support (3) is equipped with a limiting device for limiting the pressure vessel.

7. The reactor pressure vessel flange sealing surface leveling adjustment device as described in claim 6, characterized in that, The limiting device is a screw and nut structure, and the part that contacts the pressure vessel is made of flexible material.

8. A method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel using the apparatus described in any one of claims 1-7, characterized in that, include: Preliminary leveling: Before the pressure vessel is hoisted in, the vessel support base is preliminarily leveled using a leveling device to ensure that the upper surface of the annular support component of the vessel support base is horizontal. Container positioning: Hoist the pressure vessel into the reactor pressure vessel flange sealing surface level adjustment device so that the nozzle of the pressure vessel falls on the nozzle support of the vessel support base, and the nozzle fits into the semi-circular groove of the nozzle support base. Final leveling: Measure the levelness of the flange sealing surface and adjust the height of each lifting device until the levelness of the flange sealing surface meets the requirements; then constrain the position of the pressure vessel by using the mechanical locking mechanism of the lifting device and the limiting device of the steel structure support.

9. The method for adjusting the levelness of the flange sealing surface of a reactor pressure vessel as described in claim 8, characterized in that, In the container placement step, first measure the position of the center line of the pressure vessel nozzle, adjust the installation position of the nozzle support and the first ball joint support on the annular support, so that the center line of the semi-circular groove of the nozzle support coincides with the center line of the pressure vessel nozzle. After the adjustment is completed, fix the first ball joint support with bolts, and then slowly lower the pressure vessel so that the nozzle is embedded in the semi-circular groove of the nozzle support.

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