Welding seam heating support device and heating device for spherical head and inner and outer surfaces of cylinder

Abstract

The present application belongs to the technical field of nuclear power stabilizer welding seam processing, and provides a welding seam heating support device and a heating device for the inner and outer surfaces of a spherical head and a cylinder, wherein the welding seam heating support device comprises a first hoop assembly fixed on the spherical head, a second hoop assembly fixed on the inner or outer surface of the cylinder, and a plurality of pressing members for pressing the flexible electric heating sheet; the first hoop assembly and the second hoop assembly each comprise a plurality of arc-shaped connecting members connected through detachable connecting structures and combined to form a ring structure; the two ends of the pressing member are connected to the connecting members of the first hoop assembly and the second hoop assembly respectively, and the pressing member is pressed on the flexible electric heating sheet on the heating area. The present application realizes the fixation and pressing of the flexible electric heating sheet, makes the flexible electric heating sheet closely adhere to the surface of the heating area, avoids heat loss, and improves the heating efficiency.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant pressurizer weld processing technology, specifically relating to a weld heating support device and heating device for a spherical head and the inner and outer surfaces of the cylinder. Background Technology

[0002] After the spherical head of the nuclear power plant pressurizer is welded to the cylindrical section, the weld needs to be heat-treated to relieve welding stress. This stress relief requires heating a designated area up to a high temperature (600℃). Currently, natural gas is used as the fuel and a torch is employed for heating to achieve the stress relief effect.

[0003] In the existing technology, the torch heating method can conveniently heat products of different shapes and positions. However, during the heating process, natural gas burns in the air. When heating the weld seam of the cylinder, the heating efficiency is low due to factors such as air circulation and ambient temperature. This prolongs the heating time, resulting in a large amount of energy waste and producing a lot of waste gases such as carbon dioxide and sulfur dioxide, which does not meet current environmental requirements.

[0004] To address the aforementioned issues, the applicant proposes a method for heating welds using flexible electric heating elements. Specifically, the flexible electric heating element is placed over the area to be heated, and heat is transferred to the surface of the area through thermal conduction, thereby achieving heat treatment of the product and eliminating weld stress. To further improve heating efficiency and ensure better adhesion and fixation between the flexible electric heating element and the surface of the area to be heated, a weld heating support device is proposed. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a weld heating support device for the spherical head and the inner and outer surfaces of the cylinder. This device can fix and press the flexible electric heating element, so that the flexible electric heating element is closely attached to the surface of the area to be heated, avoiding heat loss and improving heating efficiency.

[0006] Another object of the present invention is to provide a heating device including the above-described weld heating support device.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] The weld heating support device for the spherical head and the inner and outer surfaces of the cylinder includes a first hoop assembly fixed to the spherical head, a second hoop assembly fixed to the inner or outer surface of the cylinder, and several clamping parts for pressing the flexible electric heating element.

[0009] Both the first hoop assembly and the second hoop assembly include multiple arc-shaped connectors, which are connected by a detachable connection structure and combined to form a ring structure; the two ends of the clamping member are respectively connected to the connectors of the first hoop assembly and the second hoop assembly, and the clamping member is pressed against the flexible electric heating plate on the heating area.

[0010] Preferably, the connecting member of the first hoop assembly is an arc-shaped connecting pipe.

[0011] Preferably, the connecting member of the second hoop assembly is an arc-shaped connecting plate.

[0012] Preferably, both ends of the connector are provided with splicing plates, the splicing plates extend in the radial direction, and the splicing plates are provided with splicing holes;

[0013] The detachable connection structure includes a double-ended screw and two sets of nut assemblies. The two ends of the double-ended screw are respectively inserted into the splicing holes of the splicing plates of the first hoop assembly and the second hoop assembly. The two sets of nut assemblies are respectively connected to the double-ended screw and lock the splicing plates.

[0014] Preferably, the connecting parts of the first hoop assembly and the second hoop assembly are each provided with a plurality of fixing screws; both ends of the clamping member are provided with fixing holes, and both ends of the clamping member pass through the fixing holes and are respectively mounted on the fixing screws, and are locked and fixed by fixing nuts.

[0015] Preferably, a plurality of the fixing screws are arranged at equal intervals along the circumferential direction on the connector, and the connectors on the first hoop assembly and the second hoop assembly are arranged in a one-to-one correspondence.

[0016] Preferably, the clamping member has a "C" shaped cross-section.

[0017] Preferably, the clamping member is provided with a plurality of adjustment mounting holes, which are matched with the fixing screws on the connecting member, and the plurality of adjustment mounting holes are arranged along the length direction of the clamping member.

[0018] Preferably, the first hoop assembly and the second hoop assembly have at least three connecting parts.

[0019] A heating device includes two weld seam heating support devices for the spherical heads and the inner and outer surfaces of the cylinder, a flexible electric heating element, and a power supply device; the flexible electric heating element is electrically connected to the power supply device, the power supply device provides power to the flexible electric heating element, and the flexible electric heating element covers the weld seam heating area of ​​the spherical heads and the inner and outer surfaces of the cylinder; the two weld seam heating support devices for the spherical heads and the inner and outer surfaces of the cylinder are respectively disposed on the outer surface of the spherical heads and the cylinder and on the inner surface of the spherical heads and the cylinder.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The weld heating support device of the present invention uses a first hoop assembly and a second hoop assembly to be fixed on the inner and outer surfaces of the spherical head and the cylinder, respectively, to achieve a matching connection and fixation with different structural surfaces (cylindrical surface and non-cylindrical surface) of the nuclear power pressurizer. This solves the technical problem of difficult fixing of the clamping parts, which is beneficial to the support and fixation of the clamping parts and improves the stability of the clamping parts pressing the flexible electric heating element. It also wraps the flexible electric heating element well and plays a heat preservation role to avoid heat loss, thereby improving the heating efficiency of the weld.

[0022] The heating device of the present invention uses electric heating to heat the weld heating area on the inner and outer surfaces of the spherical head and the cylinder. Combined with the use of the weld heating support device, it reduces the environmental impact of air and temperature, which is conducive to improving the heating efficiency of the weld. At the same time, no waste gas is generated during the heating process, making it green and environmentally friendly. It is also simple, convenient and safe to operate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the weld heating support device (external support device) for the spherical head and the inner and outer surfaces of the cylinder of the present invention.

[0025] Figure 2 for Figure 1 A magnified view of A in the middle.

[0026] Figure 3 This is a schematic diagram of the weld heating support device (internal support device) for the spherical head and the inner and outer surfaces of the cylinder of the present invention.

[0027] Figure 4 for Figure 3 A magnified view of B in the middle.

[0028] Figure 5 This is a schematic diagram showing the weld heating support device for the spherical head and the inner and outer surfaces of the cylinder after it has been installed on the spherical head and the inner and outer surfaces of the cylinder.

[0029] in:

[0030] 1-First hoop assembly, 2-Second hoop assembly, 11 / 21-Connector, 3-Clamping component, 4-Fixing screw, 5-Fixing nut, 6-Splicing plate, 7-Double-ended screw, 8-Nut assembly, 9-Cylinder, 10-Spherical head, 11-Insulation layer, 12-Flexible electric heating element. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] Example 1

[0034] See Figures 1-5 This embodiment discloses a weld heating support device for a spherical head and the inner and outer surfaces of a cylinder, including a first hoop assembly 1 fixed on the spherical head 10, a second hoop assembly 2 fixed on the inner or outer surface of the cylinder 9, and a plurality of clamping members 3 for pressing the flexible electric heating element 12; the first hoop assembly 1 and the second hoop assembly 2 each include a plurality of arc-shaped connecting members 11 / 21, which are connected by a detachable connection structure and combined to form a ring structure; the two ends of the clamping member 3 are respectively connected to the connecting members of the first hoop assembly 1 and the second hoop assembly 2, and the clamping member 3 presses against the flexible electric heating element 12 in the heating area.

[0035] See Figures 1-5The connecting member 11 of the first hoop assembly 1 is an arc-shaped connecting pipe. This ensures that when the tubular first hoop assembly 1 is fixed and locked onto the spherical end cap 10, it achieves line contact with the spherical surface of the spherical end cap 10, which helps improve stability and provides a positioning function. Specifically, the connecting pipe can be made of steel pipe formed by bending.

[0036] See Figures 1-5 The connecting member 21 of the second hoop assembly 2 is an arc-shaped connecting plate. Using this connecting plate as the connecting member 21 of the second hoop assembly 2, the plate structure increases the contact area with the inner and outer surfaces of the cylinder 9, thereby increasing the friction between the second hoop assembly 2 and the inner and outer surfaces of the cylinder 9, thus improving stability and preventing displacement. Specifically, the connecting plate can be made by rolling steel plates.

[0037] See Figures 1-5 Both ends of the connector 11 / 21 are provided with splicing plates 6, which extend radially and have splicing holes. The detachable connection structure includes a double-ended screw 7 and two sets of nut assemblies 8. The two ends of the double-ended screw 7 are respectively inserted into the splicing holes of the splicing plates 6 of the connector 11 / 21 of the first hoop assembly 1 and the second hoop assembly 2. The two sets of nut assemblies 8 are respectively engaged with the double-ended screw 7 and lock the splicing plates 6. Specifically, in this embodiment, the nut assembly 8 includes two nuts, both of which are engaged with the threaded section at one end of the double-ended screw 7 and are located on both sides of the splicing plate 6. By locking the two sets of nut assemblies 8 with the double-ended screw 7, the connection and fixation between the ends of the two connecting parts 11 / 21 are realized, thereby realizing the assembly of the first hoop assembly 1 and the second hoop assembly 2 and achieving the purpose of detachable connection; in addition, during the assembly process, the distance between the ends of the two connecting parts 11 / 21 can be slightly adjusted by adjusting the nut assemblies 8 at both ends of the double-ended screw 7, thereby expanding or shrinking the first hoop assembly 1 and the second hoop assembly 2 to adapt to the heating support fixation at different positions, with good flexibility.

[0038] In addition, the detachable connection structure of this embodiment can also adopt other implementation methods in the prior art, such as: snap-fit ​​structure.

[0039] See Figures 1-2Furthermore, in this embodiment, the splicing plate 6 of the first hoop assembly 1 and the second hoop assembly 2 is disposed on the outside of the connector 11 / 21, that is, outside the ring formed by the multiple connectors 11 / 21. Thus, the weld heating support device for the inner and outer surfaces of the spherical head 10 and the cylinder 9 in this embodiment is used to support and fix the flexible electric heating element 12 on the outer surface of the weld between the spherical head 10 and the cylinder 9, and can be called an external support device. Disposing the splicing plate 6 on the outside also facilitates installation and disassembly on the outer surface of the product. In this embodiment, three connectors 11 / 21 are provided for both the first hoop assembly 1 and the second hoop assembly 2 of the external support device, that is, the annular first hoop assembly 1 and the second hoop assembly 2 are divided into three sections for easier handling and installation, reducing installation difficulty.

[0040] See Figures 3-4 In another embodiment, the splicing plate 6 of the first hoop assembly 1 and the second hoop assembly 2 is disposed inside the connector 11 / 21, that is, within the ring formed by the multiple connectors 11 / 21. Thus, the weld heating support device for the spherical head 10 and the inner and outer surfaces of the cylinder 9 in this embodiment is used to support and fix the flexible electric heating element 12 on the inner surface of the weld between the spherical head 10 and the cylinder 9, and can be called an internal support device. Disposing the splicing plate 6 inside also facilitates installation and disassembly on the outer surface of the product. The internal support device has four connectors 11 / 21 for both the first hoop assembly 1 and the second hoop assembly 2, dividing the annular first hoop assembly 1 and the second hoop assembly 2 into four segments, making it easier to transport them into the inner cavity of the cylinder 9.

[0041] See Figures 1-4 The first hoop assembly 1 and the second hoop assembly 2 each have multiple fixing screws 4 on their connecting parts 11 / 21; both ends of the clamping member 3 have fixing holes, and both ends of the clamping member 3 pass through the fixing holes onto the fixing screws 4, and are locked in place by fixing nuts 5. In this embodiment, the fixing nuts 5 are wing nuts, which are easy to tighten and allow for quick assembly and disassembly of the clamping member 3 according to the specific heating area. By setting multiple fixing screws 4, the installation and fixing positions of the clamping member 3 are increased, improving flexibility. The position of the clamping member 3 can be flexibly increased or adjusted according to the actual heating area, thereby ensuring that the flexible electric heating element 12 is pressed tightly.

[0042] See Figures 1-4 Multiple fixing screws 4 are arranged at equal intervals along the circumferential direction on the connector 11 / 21, and the connectors 11 / 21 on the first hoop assembly 1 and the second hoop assembly 2 are arranged in a one-to-one correspondence.

[0043] See Figures 1-4The clamping member 3 has a C-shaped cross-section. Furthermore, to improve the clamping fit between the clamping member 3 and the flexible electric heating element 12 on the inner and outer surfaces of the cylinder 9 and the surface of the spherical head 10, a clamping member 3 with certain flexibility can be used. This allows the clamping member 3 to deform after its two ends are fixed to the first hoop assembly 1 and the second hoop assembly 2, thereby better covering and clamping the flexible electric heating element 12, thus improving the heating effect of the flexible electric heating element 12 on the weld between the spherical head 10 and the inner and outer surfaces of the cylinder 9.

[0044] In this embodiment, multiple adjustment mounting holes can be provided on the clamping member 3. These holes are matched with the fixing screws 4 on the connecting member 11 / 21, and are arranged along the length of the clamping member 3. Furthermore, the multiple adjustment mounting holes can be arranged at equal intervals. By providing multiple adjustment mounting holes, the flexibility of the fit between the clamping member 3 and the fixing screws 4 on the connecting member can be improved. This allows for the selection of two adjustment mounting holes or fixing holes at appropriate distances based on the actual heating area and the position of the flexible electric heating element 12, thereby fixing the clamping member 3 onto the first hoop assembly 1 and the second hoop assembly 2, and straightening the clamping member 3 to improve the clamping effect.

[0045] Furthermore, when there are protruding objects (such as manholes) in the area covered by the flexible electric heating element 12, the length of the clamping member 3 may be shortened, and it may not be able to completely cover the flexible electric heating element 12. In this case, an additional flexible strap of flexible synthetic fiber can be added to the outside of the clamping member 3 for reinforcement to ensure that the degree of adhesion between the flexible electric heating element 12 and the surface of the heating area meets the technical requirements.

[0046] See Figures 1-5 The working principle of the weld heating support device between the spherical head and the inner and outer surfaces of the cylinder in this embodiment is as follows:

[0047] The heating area is determined on the spherical head 10 and cylinder 9 of the nuclear power pressurizer, and the positions of the first hoop assembly 1 and the second hoop assembly 2 on the spherical head 10 and cylinder 9 are drawn.

[0048] Subsequently, the installation of the spherical head and the external support device on the outer surface of the cylinder is completed first. Specifically, multiple connectors 21 of the second hoop assembly 2 are first installed on the surface of the cylinder 9. Specifically, during installation, the ends between two adjacent connectors 21 are connected and fixed by a double-ended screw 7 and a nut assembly 8, ultimately forming a ring-shaped structure that is firmly locked and fixed to the surface of the cylinder 9. Next, multiple connectors 11 of the first hoop assembly 1 are installed on the spherical head 10, and the installation method is the same as the installation process of the second hoop assembly 2. Finally, the two ends of the clamping member 3 are respectively inserted into the fixing screws 4 of the connectors 11 / 21 of the first hoop assembly 1 and the second hoop assembly 2, and the two ends of the clamping member 3 are locked by the fixing nut 5. When using the fixing nut 5 to lock the ends of the clamping member 3, a washer can be added to increase the locking force. At this time, the clamping member 3 is pressed and wrapped around the flexible electric heating element 12 and the insulation layer 11, realizing the fixed support of the flexible electric heating element 12.

[0049] Next, the spherical head and the inner support device on the inner surface of the cylinder are installed. The installation method is the same as the installation process of the outer support device described above.

[0050] Furthermore, when installing the external support device, the connecting pieces 11 / 21 of the first hoop assembly 1 and the second hoop assembly 2 located on the upper part of the outer surface of the spherical head 10 and the cylinder 9 can be installed first. Then, the orientation of the outer surface mounting position can be adjusted by rotating the nuclear power plant voltage regulator to facilitate the installation of other connecting pieces 11 / 21. When installing the internal support device, the connecting pieces of the first hoop assembly 1 and the second hoop assembly 2 located on the lower part of the inner surface of the spherical head 10 and the cylinder 9 can be installed first. Then, the orientation of the inner surface mounting position can be adjusted by rotating the nuclear power plant voltage regulator to facilitate the installation of other connecting pieces.

[0051] See Figure 5 This embodiment also discloses a heating device, including two weld seam heating support devices for the spherical heads and the inner and outer surfaces of the cylinder, a flexible electric heating element 12, and a power supply device. The flexible electric heating element 12 is electrically connected to the power supply device, which provides power to the flexible electric heating element 12. The flexible electric heating element 12 covers the weld seam heating area on the inner and outer surfaces of the spherical heads 10 and the cylinder 9. The two weld seam heating support devices for the inner and outer surfaces of the spherical heads 10 and the cylinder 9 are respectively disposed on the outer surface of the spherical heads and the cylinder and on the inner surface of the spherical heads and the cylinder, serving as an outer support device and an inner support device, respectively.

[0052] Furthermore, the heating device in this embodiment also includes a heat insulation layer 11, which covers the flexible electric heating element 12, and the pressing member 3 is covered and pressed in the heat insulation layer 11.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A heating support device for the weld seam between a spherical head and the inner and outer surfaces of a cylinder, characterized in that, It includes a first hoop assembly fixed to the inner or outer surface of the spherical head, a second hoop assembly fixed to the inner or outer surface of the cylinder, and several clamping parts for pressing the flexible electric heating element; Both the first hoop assembly and the second hoop assembly include multiple arc-shaped connectors, which are connected by a detachable connection structure and combined to form a ring structure; the two ends of the clamping member are respectively connected to the connectors of the first hoop assembly and the second hoop assembly, and the clamping member presses against the flexible electric heating plate on the heating area; Both the first and second hoop assemblies have multiple fixing screws on their connecting parts; both ends of the clamping member have fixing holes, and both ends of the clamping member pass through the fixing holes onto the fixing screws and are locked in place by fixing nuts.

2. The welding support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 1, characterized in that, The connecting component of the first hoop assembly is an arc-shaped connecting pipe.

3. The weld heating support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 1, characterized in that, The connecting component of the second hoop assembly is an arc-shaped connecting plate.

4. The weld heating support device for the spherical head and the inner and outer surfaces of the cylinder according to any one of claims 1-3, characterized in that, Both ends of the connector are provided with splicing plates, which extend radially and are provided with splicing holes. The detachable connection structure includes a double-ended screw and two sets of nut assemblies. The two ends of the double-ended screw are respectively inserted into the splicing holes of the splicing plates of the first hoop assembly and the second hoop assembly. The two sets of nut assemblies are respectively connected to the double-ended screw and lock the splicing plates.

5. The welding support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 4, characterized in that, Multiple fixing screws are arranged at equal intervals along the circumferential direction on the connector, and the connectors on the first hoop assembly and the second hoop assembly are arranged in a one-to-one correspondence.

6. The welding support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 1, characterized in that, The clamping member has a "C" shaped cross-section.

7. The weld heating support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 1 or 6, characterized in that, The clamping member is provided with a plurality of adjustment mounting holes, which are matched with the fixing screws on the connecting member, and the plurality of adjustment mounting holes are arranged along the length direction of the clamping member.

8. The welding support device for the spherical head and the inner and outer surfaces of the cylinder according to claim 1, characterized in that, The first hoop assembly and the second hoop assembly have at least three connecting parts.

9. A heating device, characterized in that, The device includes two weld heating support devices for the spherical head and the inner and outer surfaces of the cylinder as described in any one of claims 1-8, a flexible electric heating element, and a power supply device; the flexible electric heating element is electrically connected to the power supply device, the power supply device provides power to the flexible electric heating element, and the flexible electric heating element covers the weld heating area of ​​the spherical head and the inner and outer surfaces of the cylinder; the two weld heating support devices for the spherical head and the inner and outer surfaces of the cylinder are respectively disposed on the outer surface of the spherical head and the cylinder and on the inner surface of the spherical head and the cylinder.

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