Apparatus for fixing the groove cutting device of the heater sleeve for nuclear power plant pressurizers

Abstract

A fixing device for fixing a processing device for performing processing of a heater sleeve for a nuclear power plant pressurizer according to one embodiment of the present specification comprises: a first fixing part having one end connected to the interior of the heater sleeve and the other end connected to the central axis of the processing device to fix the upper part of the processing device to the pressurizer; and a second fixing part coupled between the central axis of the processing device and a nozzle provided at the lower part of the pressurizer to fix the lower part of the processing device to the pressurizer. The first fixing part is characterized by comprising: a shaft having a predetermined length, with both ends connected to the interior of the heater sleeve and the central axis of the processing device, respectively, and capable of vertical movement; a clamp having a cylinder shape with an internal empty space, coupled to one end of the shaft, which expands or contracts according to the vertical movement of the shaft to contact or detach from the inner wall of the heater sleeve; and a clamp holder that can be inserted into the empty space of the clamp and has its lower end coupled to the shaft.

Description

Technology Field

[0001] The present invention relates to a fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer in order to maintain weight balance and prevent vibration and shaking of the equipment during processing. Background Technology

[0002] When designing a nuclear power plant, equipment or systems performing the same function are designed to have different operating principles or are physically separated to minimize the possibility of facilities simultaneously losing function in the event of a multi-impact event.

[0003] A "common cause failure" refers to a situation where two or more devices or equipment fail or lose function simultaneously or within a short period of time due to the same cause. This phenomenon is primarily caused by internal factors such as corrosion, fatigue, and wear, human error, or environmental factors such as humidity, temperature, and vibration.

[0004] The present invention aims to minimize vibration among the factors of the aforementioned common cause failures, and specifically proposes a configuration to minimize vibration generated when repairing or maintaining a pressurizer of a nuclear power plant.

[0005] In other words, we propose a technical configuration for fixing a processing device, which is the entity responsible for repairing or maintaining the pressurizer, to the pressurizer.

[0006] Related prior art is Registered Utility Model Publication No. 20-0379376 (Title of invention: Pressurizer heater equipped in reactor coolant system of nuclear facility, Date of publication: March 18, 2005). The problem to be solved

[0007] According to one embodiment of the present invention, by fixing the upper and lower parts of a heater sleeve processing device for a pressurizer to the center of the heater sleeve and the lower center of the pressurizer, respectively, a fixing device is provided that can withstand the load on the processing device and prevent vibration and shaking while processing is performed on the welded part of the heater sleeve. means of solving the problem

[0008] A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer according to one embodiment of the present invention comprises: a first fixing part having one end connected to the interior of the heater sleeve and the other end connected to the central axis of the processing device to fix the upper part of the processing device to the pressurizer; and a second fixing part coupled between the central axis of the processing device and a nozzle provided at the lower part of the pressurizer to fix the lower part of the processing device to the pressurizer. The first fixing part is characterized by comprising: a shaft having a predetermined length, with both ends connected to the interior of the heater sleeve and the central axis of the processing device, respectively, and capable of vertical movement; a clamp having a cylinder shape with an internal empty space, coupled to one end of the shaft, which expands or contracts according to the vertical movement of the shaft to contact or detach from the inner wall of the heater sleeve; and a clamp holder that can be inserted into the empty space of the clamp and has its lower end coupled to the shaft.

[0009] delete

[0010] In the above embodiment, the clamp holder can be implemented in the shape of an inverted cone with a diameter that widens in the upward direction.

[0011] In the above embodiment, the clamp includes a body having elasticity and is provided with a plurality of slits along the circumferential direction, and the body of the clamp can open or close as the clamp holder is lowered or raised while inserted into the clamp.

[0012] In the above embodiment, the direction in which the plurality of slits are opened may be formed to intersect one side and the other side.

[0013] In the above embodiment, a tightening bolt is provided at the lower part of the central axis, and the clamp holder may be lowered or raised by tightening and loosening the tightening bolt.

[0014] In addition, as another embodiment, a fixing device for fixing a processing device that performs processing of a heater sleeve for a nuclear power plant pressurizer comprises: a first fixing part for fixing the upper part of the processing device to the pressurizer, wherein one side is connected to the interior of the heater sleeve and the other side is connected to the central axis of the processing device; and a second fixing part for fixing the lower part of the processing device to the pressurizer, wherein the second fixing part comprises a supporting member that is connected to the lower side of the central axis to provide support, a connecting member that is connected to the supporting member and the other side extends toward the nozzle, and a fastening member that is connected to the other side of the connecting member and is fastened to wrap around a portion of the circumference of the nozzle.

[0015] In the above embodiment, if the number of processing devices for fixing to the pressurizer is one or two, the fastening members may be fastened at 180-degree intervals around the circumference of the nozzle.

[0016] In the above embodiment, when the number of processing devices for fixing to the pressurizer is three, the fastening members can be fastened to the circumference of the nozzle at 120-degree intervals.

[0017] In the above embodiment, the length of the connecting member may be changed according to the processing range of the heater sleeve. Effects of the invention

[0018] According to one embodiment of the present invention, by fixing the upper and lower parts of a heater sleeve processing device for a pressurizer to the center of the heater sleeve and the lower center of the pressurizer, respectively, the processing device can withstand the load and prevent vibration and shaking while processing is performed on the welded part of the heater sleeve. Brief explanation of the drawing

[0019] FIG. 1 is a drawing showing a fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer according to an embodiment of the present invention applied to the lower part of the pressurizer. FIG. 2 is a drawing illustrating a first fixing part according to an embodiment of the present invention. FIGS. 3a and 3b are drawings illustrating the process of the clamp expanding or contracting according to the structure of the clamp holder and the vertical movement of the shaft in an embodiment of the present invention. FIG. 4 is a drawing illustrating a second fixing part according to an embodiment of the present invention. FIGS. 5a to 5c are drawings illustrating the structure of a fastening member according to the number of processing devices in an embodiment of the present invention. FIG. 6 is a drawing illustrating a variable structure of a connecting member according to an embodiment of the present invention. Specific details for implementing the invention

[0020] The present invention is susceptible to various modifications and may have various embodiments, and specific embodiments will be described in detail with reference to the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each drawing.

[0021] Terms such as "first," "second," etc., may be used to describe various components, but said components shall not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0022] For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related description items or any one of a plurality of related description items.

[0023] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0024] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0025] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0026] Throughout the specification and claims, when a part is described as including a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0027] Accordingly, various embodiments of the present invention for solving the technical problems described above will be described.

[0029] FIG. 1 is a drawing showing a fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer according to an embodiment of the present invention applied to the lower part of the pressurizer, FIG. 2 is a drawing showing a first fixing part according to an embodiment of the present invention, and FIG. 3a and FIG. 3b are drawings showing the process of the clamp expanding or contracting according to the structure of the clamp holder and the vertical movement of the shaft in an embodiment of the present invention.

[0030] The fixing device (10) according to an embodiment of the present invention can be used to fix the processing device (20) so that no movement occurs while the processing device (20) performs a cutting operation on the welded portion of the heater sleeve (1).

[0031] Specifically, by fixing the upper part of the processing device (20) to the heater sleeve (1) through the fixing device (10) and fixing the lower part of the processing device (20) to the nozzle (2) provided at the lower part of the pressurizer, the processing device (20) is intended to withstand the load and prevent vibration and shaking.

[0032] Referring to FIG. 1, a fixing device (10) according to an embodiment of the present invention may be configured to include a first fixing part (100) for fixing the upper part of a processing device (20) to a pressurizer and a second fixing part (200) for fixing the lower part of a processing device (20) to a pressurizer.

[0033] The first fixed part (100) may have a structure in which one side is connected to the interior of the heater sleeve (1) and the other side is connected to the central axis (22) of the processing device (20). Here, the heater sleeve (1) to which one side of the first fixed part (100) is connected corresponds to the heater sleeve (1) that is the target of the cutting operation.

[0034] In one embodiment, the first fixing part (100) may be configured to include a shaft (110), a clamp (120), and a clamp holder (130).

[0035] The shaft (110) has a predetermined length and corresponds to a configuration in which both ends are connected to the interior of the heater sleeve (1) and the central axis (22) of the processing device (20), respectively. That is, one end of the shaft (110) is connected to the interior of the heater sleeve (1), and the other end of the shaft (110) can be connected to the central axis (22) of the processing device (20).

[0036] In one embodiment, the shaft (110) may be capable of moving up and down. To this end, a tightening bolt (24) may be provided at the lower part of the central axis (22), and as the central axis (22) moves up and down by tightening and loosening the tightening bolt (24), the shaft (110) also moves up and down.

[0037] For example, when the tightening bolt (24) is tightened in one direction, the shaft (110) connected to the central axis (22) can descend downward, whereas when the tightening bolt (24) is loosened in the other direction, the shaft (110) connected to the central axis (22) can ascend upward.

[0038] The clamp (120) is coupled to one end of the shaft (110) and corresponds to a configuration implemented in the form of a cylinder having an empty space inside. As shown in FIG. 2, a clamp holder (130), which will be described later, can be inserted into the interior of the clamp (120).

[0039] In one embodiment, the clamp (120) may expand or contract according to the vertical movement of the shaft (110) to come into contact with or separate from the inner wall of the heater sleeve (1). That is, when the clamp (120) expands, it comes into contact with the inner wall of the heater sleeve (1), and when the clamp (120) contracts, it separates again from the inner wall of the heater sleeve (1). The expansion or contraction of the clamp (120) may be performed according to the structural relationship with the clamp holder (130) inserted inside and the vertical movement of the shaft (110), and the details regarding this will be described in detail below with reference to FIGS. 3a and 3b.

[0040] The clamp holder (130) can be inserted into the interior of the clamp (120) and its lower side can be coupled with the shaft (110). Accordingly, as the shaft (110) connected to the central axis (22) moves up and down, the clamp holder (130) can be lowered or raised while inserted into the interior of the clamp (120).

[0041] In one embodiment, the clamp holder (130) may be implemented in the shape of an inverted cone with a diameter that widens in the upward direction. Accordingly, the clamp holder (130) has the effect of facilitating insertion into the clamp (120).

[0042] In one embodiment, the clamp (120) may include a body having elasticity and a plurality of slits (122) along the circumferential direction.

[0043] In one embodiment, the direction in which a plurality of slits (122) are opened may be formed to alternately face one side and the other side. That is, the plurality of slits (122) may be opened alternately to one side and the other side, and specifically, a slit (122) opened toward the top and a slit (122) opened toward the bottom may be formed to alternately face along the circumferential direction of the clamp (120). Accordingly, the expansion or contraction of the clamp (120) can be facilitated.

[0044] Hereinafter, with reference to FIGS. 3a and 3b, we intend to explain the structure of the clamp holder (130) and the process of the clamp (120) being fixed inside the heater sleeve (1) as the clamp (120) expands or contracts due to the vertical movement of the shaft (110).

[0045] As illustrated in FIG. 3a, the first fixing part (100) may have a structure in which a clamp holder (130) is inserted into the interior of the clamp (120) and one end of the shaft (110) is coupled to the lower part of the clamp (120). The lower side of the clamp holder (130) may also be coupled to one end of the shaft (110).

[0046] The first fixed part (100) of this structure can be inserted into the interior of the heater sleeve (1) as shown in FIG. 3b.

[0047] At this time, when the tightening bolt (24) provided at the lower part of the central axis (22) is tightened in one direction, the shaft (110) connected to the central axis (22) descends, and the clamp holder (130) coupled to one end of the shaft (110) descends. That is, the clamp holder (130) inserted inside the clamp (120) moves further down. At this time, as shown in FIG. 3c, as the clamp holder (130) descends, the body of the clamp (120) opens up and the clamp (120) expands, and as shown in FIG. 3d, the expanded clamp (120) can be fixed by contacting the inner wall surface of the heater sleeve (1). When the upper part of the processing device (20) is stably fixed according to the above process, a cutting operation can be performed.

[0048] In order to release the fixation of the processing device (20) after the cutting operation is finished, the above process can be performed in reverse. Specifically, when the tightening bolt (24) provided at the bottom of the central axis (22) is loosened in the other direction, the shaft (110) connected to the central axis (22) rises upward, and the clamp holder (130) coupled to one end of the shaft (110) rises. That is, the clamp holder (130) inserted inside the clamp (120) moves upward. At this time, as the clamp holder (130) rises, the body of the clamp (120) contracts and the clamp (120) contracts, and the contracted clamp (120) can be separated from the inner wall of the heater sleeve (1).

[0049] FIG. 4 is a drawing illustrating a second fixing part according to an embodiment of the present invention, FIG. 5a to 5c are drawings illustrating the structure of a fastening member according to the number of processing devices in an embodiment of the present invention, and FIG. 6 is a drawing illustrating a variable structure of a connecting member according to an embodiment of the present invention.

[0050] Referring to FIG. 4, the second fixed part (200) may have a structure that is coupled between the central axis (22) of the processing device (20) and the nozzle (2) provided at the bottom of the pressurizer. Here, the nozzle (2) corresponds to a surge nozzle (2) provided at the center of the bottom of the pressurizer.

[0051] In one embodiment, the second fixing part (200) may be configured to include a supporting member (210), a connecting member (220), and a fastening member (230).

[0052] The support member (210) corresponds to a configuration that is combined with the lower side of the central axis (22) to provide support.

[0053] In one embodiment, a rotation unit (30) that induces rotation of the processing device (20) is provided at the lower part of the central axis (22), and a part of the support member (210) can be connected to a part of the circumferential surface of the rotation unit (30) through a fastening means (not shown).

[0054] In one embodiment, the support member (210) may be positioned in an upright state due to its structure.

[0055] The connecting member (220) corresponds to a configuration in which one side is coupled to the supporting member and the other side is extended toward the nozzle (2).

[0056] In one embodiment, the connecting member (220) is in the form of a rod having a predetermined length, with one end connected to the lower part of the supporting member (210) and the other end connected to the fastening member (230) described later. At this time, the connection between both sides of the connecting member (220) may be formed through a fastening means, and there is no limitation on the fastening means.

[0057] In one embodiment, the length of the connecting member (220) may be changed according to the processing range of the heater sleeve (1).

[0058] For example, in order to perform a cutting operation on a heater sleeve (1) that is positioned relatively far from the center of the pressurizer, the position of the processing device (20) needs to be far from the center of the pressurizer. To this end, as shown in FIG. 6, the length of the connecting member (220) can be implemented to be longer than a preset reference length.

[0059] For reference, the aforementioned variable length structure can be implemented through a sliding structure between frames forming the connecting member (220), and various variable structures can be applied without being limited thereto.

[0060] The fastening member (230) can be connected to the other side of the connecting member and fastened to wrap around a portion of the circumference of the nozzle (2).

[0061] In one embodiment, the fastening member (230) may be fastened in the form of a clamp having a predetermined curvature to surround a portion of the circumference of the nozzle (2).

[0062] Meanwhile, depending on the number of processing devices (20), the fastening structure of the fastening member (230) fastened to the nozzle (2) may be applied differently.

[0063] In one embodiment, when the number of processing devices (20) for fixing to the pressurizer is one or two, as shown in FIG. 5a and FIG. 5b, the fastening members (230) can be fastened at 180-degree intervals around the circumference of the nozzle (2).

[0064] In one embodiment, when the number of processing devices (20) for fixing to the pressurizer is three, as shown in FIG. 5c, the fastening members (230) can be fastened at 120-degree intervals around the circumference of the nozzle (2).

[0065] At this time, the connecting member (220) is applied in the same shape and structure regardless of the number of processing devices (20).

[0066] Thus, according to one embodiment of the present invention, by fixing the upper and lower parts of the heater sleeve processing device for a pressurizer to the center of the heater sleeve and the lower center of the pressurizer, respectively, the load on the processing device can be withstood and vibration and shaking can be prevented while processing is performed on the welded part of the heater sleeve.

[0068] The embodiments disclosed in this specification have been described above with reference to the accompanying drawings. The embodiments illustrated in each drawing should not be interpreted restrictively and may be combined with one another by those skilled in the art who have read the contents of this specification; in such cases, it may be interpreted that some components may be omitted.

[0069] Herein, terms or words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a sense and concept consistent with the technical ideas disclosed in this specification.

[0070] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely examples disclosed in this specification and do not represent all technical ideas disclosed in this specification; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Explanation of the symbols

[0071] 1 : Heater Sleeve 2 : Nozzle 10 : Fixture 20 : Processing device 22 : Central axis 24 : Tightening bolt 30 : Rotating unit 100 : First fixed part 110 : Shaft 120 : Clamp 122 : Slit 130: Clamp holder 200 : Second fixed part 210 : Support member 220 : Connecting member 230 : Fastening member

Claims

Claim 1 A fixing device for fixing a processing device for performing processing of a heater sleeve for a nuclear power plant pressurizer, comprising: a first fixing part having one end connected to the interior of the heater sleeve and the other end connected to the central axis of the processing device to fix the upper part of the processing device to the pressurizer; and a second fixing part coupled between the central axis of the processing device and a nozzle provided at the lower part of the pressurizer to fix the lower part of the processing device to the pressurizer; wherein the first fixing part comprises: a shaft having a predetermined length, with both ends connected to the interior of the heater sleeve and the central axis of the processing device, respectively, and capable of vertical movement; a clamp having a cylinder shape with an internal empty space, coupled to one end of the shaft, which expands or contracts according to the vertical movement of the shaft to contact or detach from the inner wall of the heater sleeve; and a clamp holder that can be inserted into the empty space of the clamp and has its lower end coupled to the shaft. Claim 2 delete Claim 3 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in claim 1, the clamp holder is implemented in the shape of an inverted cone with a diameter that widens in the upward direction. Claim 4 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, wherein, in paragraph 3, the clamp comprises a body having elasticity and provided with a plurality of slits along the circumferential direction, and the body of the clamp expands or contracts as the clamp holder descends or rises while inserted into the clamp. Claim 5 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in paragraph 4, the direction in which the plurality of slits are opened is formed to intersect on one side and the other side. Claim 6 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in paragraph 4, a tightening bolt is provided at the lower part of the central axis, and the clamp holder can be lowered or raised by tightening and loosening the tightening bolt. Claim 7 A fixing device for fixing a processing device for performing processing of a heater sleeve for a nuclear power plant pressurizer, comprising: a first fixing part having one side connected to the interior of the heater sleeve and the other side connected to the central axis of the processing device to fix the upper part of the processing device to the pressurizer; and a second fixing part coupled between the central axis of the processing device and a nozzle provided at the lower part of the pressurizer to fix the lower part of the processing device to the pressurizer; wherein the second fixing part comprises a supporting member coupled to the lower side of the central axis to provide supporting force, a connecting member having one side coupled to the supporting member and the other side extended toward the nozzle, and a fastening member coupled to the other side of the connecting member to wrap around a portion of the circumference of the nozzle. Claim 8 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in claim 7, when the number of processing devices for fixing to the pressurizer is one or two, the fastening member is fastened at 180-degree intervals to the circumference of the nozzle. Claim 9 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in claim 7, when the number of processing devices for fixing to the pressurizer is three, the fastening members are fastened at 120-degree intervals to the circumference of the nozzle. Claim 10 A fixing device for fixing a processing device for a heater sleeve for a nuclear power plant pressurizer, characterized in that, in claim 7, the length of the connecting member can be changed according to the processing range of the heater sleeve.

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