Heat transfer tube detection structure and device

Abstract

The utility model discloses a heat transfer tube detection structure and device. The heat transfer tube detection structure comprises a positioning plate, wherein the positioning plate comprises an eddy current detection hole, a positioning hole and an auxiliary hole which are arranged at intervals; the interior of the positioning toe is hollow, the positioning toe is fixedly connected with the first end of the positioning hole, and the second end of the positioning hole is fixedly connected with the compressed air hose; the auxiliary toes are fixedly connected with the first ends of the auxiliary holes; the first end of the flexible probe sleeve is fixedly connected with the second end of the eddy current detection hole, and the second end of the flexible probe sleeve is connected with the eddy current probe. The eddy current detection hole, the positioning hole and the auxiliary hole are formed in the positioning plate at the same time, the positioning hole is used for blowing and drying the heat transfer tube, the eddy current detection hole is used for carrying out eddy current detection on the dried heat transfer tube beside, blowing and drying and eddy current detection are carried out at the same time, the overall maintenance efficiency is improved, the operation time is shortened, and the irradiation dose is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant operation and maintenance technology, and in particular to a heat transfer tube detection structure and device. Background Technology

[0002] The Passive Residual Heat Removal Heat Exchanger (PRHR HX) is a crucial Class I nuclear power plant system within the primary loop. Damage to its heat transfer tubes can allow radioactive media to enter the shell-side water tank, causing significant losses. To ensure the safe and stable operation of the nuclear power plant, eddy current testing of the PRHR HX heat transfer tubes is required periodically. However, due to the C-shaped shape of the PRHR HX heat transfer tubes, the limited number (only a few hundred), and the small size of the end caps, manual positioning and inspection are typically performed outside the manhole. During manual positioning, the operator manually aligns the sleeve with the internal tube sheet opening from outside the manhole. The data acquisition personnel then control the eddy current analyzer to push the probe through the sleeve and out of the heat transfer tube to complete the single-tube inspection. Space constraints limit operation to a single person, making simultaneous purging and positioning inspection impossible, severely reducing the efficiency of eddy current testing. Utility Model Content

[0003] This invention provides a heat transfer tube detection structure and device to simultaneously perform purging and eddy current detection, thereby improving detection efficiency and reducing operation time.

[0004] In a first aspect, this utility model provides a heat transfer tube detection structure, the structure comprising:

[0005] A positioning plate, the positioning plate comprising eddy current detection holes, positioning holes and auxiliary holes arranged at intervals;

[0006] The positioning toe is hollow inside, and is fixedly connected to the first end of the positioning hole, while the second end of the positioning hole is fixedly connected to a compressed air hose.

[0007] An auxiliary toe, wherein the auxiliary toe is fixedly connected to the first end of the auxiliary hole;

[0008] A flexible probe sleeve, the first end of which is fixedly connected to the second end of the eddy current detection hole, and the second end of the flexible probe sleeve is connected to the eddy current probe.

[0009] Optionally, the heat transfer tube detection structure also includes a handle;

[0010] The handle is hollow inside, and the first end of the handle is fixedly connected to the second end of the positioning hole; the second end of the handle is fixedly connected to the compressed air hose.

[0011] Optionally, the heat transfer tube detection structure further includes a gas pipe connector;

[0012] The second end of the handle is fixedly connected to the compressed air hose via the air pipe connector.

[0013] Optionally, the heat transfer tube detection structure further includes a first fixing member;

[0014] The positioning toe and the handle are fixedly connected to the positioning hole via the first fixing member.

[0015] Optionally, the heat transfer tube detection structure further includes a second fixing member;

[0016] The auxiliary toe is fixedly connected to the auxiliary hole via the second fixing member.

[0017] Optionally, the heat transfer tube detection structure further includes a third fixing component;

[0018] The flexible probe sleeve is fixedly connected to the eddy current detection hole through the third fixing member.

[0019] Optionally, the center of the eddy current detection hole, the center of the positioning hole, and the center of the auxiliary hole are located on the same straight line.

[0020] Optionally, the size of the positioning toe is the same as the size of the auxiliary toe.

[0021] Optionally, the auxiliary toe is a solid metal structure inside.

[0022] Secondly, this utility model provides a heat transfer tube detection device, including the heat transfer tube detection structure described in any one of the first aspects.

[0023] The technical solution of this utility model embodiment provides a heat transfer tube detection structure, including a positioning plate, which includes spaced-apart eddy current detection holes, positioning holes, and auxiliary holes; a positioning toe, the interior of which is hollow, fixedly connected to a first end of the positioning hole, and the second end of the positioning hole fixedly connected to a compressed air hose; an auxiliary toe, fixedly connected to a first end of the auxiliary hole; and a flexible probe sleeve, the first end of which is fixedly connected to a second end of the eddy current detection hole, and the second end of the flexible probe sleeve is connected to an eddy current probe. By simultaneously providing eddy current detection holes, positioning holes, and auxiliary holes on the positioning plate, the positioning holes purge and dry the heat transfer tube, while the eddy current detection holes perform eddy current detection on adjacent, already dried heat transfer tubes, achieving simultaneous purging, drying, and eddy current detection, improving overall maintenance efficiency, reducing operation time, and decreasing the radiation dose received.

[0024] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of a positioning plate provided in an embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of a heat transfer tube detection structure provided in an embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] When conducting in-service inspections of heat transfer tubes in passive residual heat removal heat exchangers at nuclear power plants, manual positioning and inspection is less risky, less costly, and has a similar timeframe compared to using a tube-sheet crawling robot to locate and inspect tens of thousands of heat transfer tubes. Before eddy current inspection, residual water inside the tubes must be removed. During purging, operators must hold an air hose or extension rod close to the tube opening to blow out and dry the internal residual water. During eddy current inspection, operators hold the eddy current probe sleeve, align it with the tube opening to be inspected, and after verification, push the probe to complete the single-tube inspection, then move to the next tube opening. Due to space limitations in the end caps and manholes, purging and inspection cannot be performed simultaneously. In practice, purging is done by area first, then switching to tube-by-tube inspection, alternating until all heat transfer tubes are inspected. Due to space constraints, only one person can operate the system, and purging and positioning inspection cannot be performed simultaneously.

[0033] Accordingly, this embodiment provides a heat transfer tube detection structure and device.

[0034] Figure 1 This is a schematic diagram of the structure of a positioning plate provided in an embodiment of the present utility model. Figure 2 This is a schematic diagram of a heat transfer tube detection structure provided in an embodiment of the present invention, as shown below. Figure 1 and Figure 2 As shown, the heat transfer tube detection structure 100 includes a positioning plate 101, which includes eddy current detection holes 102, positioning holes 103, and auxiliary holes 104 spaced apart; a positioning toe 105, which is hollow inside, and is fixedly connected to the first end of the positioning hole 103, and the second end of the positioning hole 103 is fixedly connected to the compressed air hose 109; an auxiliary toe 106, which is fixedly connected to the first end of the auxiliary hole 104; and a flexible probe sleeve 107, which is fixedly connected to the second end of the eddy current detection hole 102, and the second end of the flexible probe sleeve 107 is connected to the eddy current probe 108.

[0035] For example, the positioning plate 101 can be a rectangular metal plate. The positioning plate 101 plays a certain supporting role, facilitating the installation of the positioning toes 105, auxiliary toes 106, and flexible probe sleeve 107. To ensure the installation effect, the positioning plate 101 is provided with eddy current detection holes 102, positioning holes 103, and auxiliary holes 104 spaced apart. The eddy current detection holes 102, positioning holes 103, and auxiliary holes 104 are all through holes. The eddy current detection holes 102, positioning holes 103, and auxiliary holes 104 can correspond to three different heat transfer tubes, which facilitates the simultaneous eddy current detection of the eddy current detection holes 102 and the purging and drying of the positioning holes 103. The positioning toe 105 is fixedly connected to the first end of the positioning hole 103, and the second end of the positioning hole 103 is fixedly connected to the compressed air hose 109. The interior of the positioning toe 105 is hollow, and the compressed air hose 109 is connected to the external nuclear power plant pressure control system, facilitating the blowing of compressed air for purging and drying into the heat transfer tube through the hollow positioning toe 105 to clean and dry residual water inside the heat transfer tube. The auxiliary toe 106 is fixedly connected to the first end of the auxiliary hole 104. The auxiliary toe 106 and the positioning toe 105 are located on the same side, allowing them to contact the heat transfer tube. The size of the auxiliary toe 106 and the positioning toe 105 is slightly smaller than the size of the heat transfer tube, facilitating the rapid positioning of the auxiliary toe 106 and the positioning toe 105 in the heat transfer tube to be tested. The second end of the eddy current detection hole 102 is fixedly connected to the first end of the flexible probe sleeve 107. The second end of the flexible probe sleeve 107 is connected to the eddy current probe 108. The flexible probe sleeve 107 provides a working transmission path for the eddy current probe 108. The eddy current probe 108 has a push-pull device, which allows the eddy current probe 108 to enter the heat transfer tube to be tested through the flexible probe sleeve 107 and the eddy current detection hole 102 via a push-pull operation, performing eddy current detection and inspecting surface defects of the heat transfer tube. The positions of the eddy current detection hole 102, the positioning hole 103, and the auxiliary hole 104 can be arranged according to actual design requirements; this embodiment of the utility model does not impose specific limitations. Figure 1 As shown, the eddy current detection hole 102, the positioning hole 103, and the auxiliary hole 104 are arranged sequentially at intervals. The eddy current detection hole 102 and the positioning hole 103 are arranged adjacent to each other, which makes it convenient to perform eddy current detection on the heat transfer tube through the eddy current detection hole 102 after the heat transfer tube corresponding to the positioning hole 103 has been purged and dried. At the same time, during the eddy current detection process, the positioning hole 103 continues to purge and dry the adjacent heat transfer tube, so that the eddy current detection and purging and drying are carried out simultaneously, which greatly improves the inspection efficiency.

[0036] This utility model embodiment utilizes a heat transfer tube detection structure including a positioning plate. The positioning plate comprises spaced-apart eddy current detection holes, positioning holes, and auxiliary holes. The positioning toe is hollow and fixedly connected to the first end of the positioning hole, while the second end of the positioning hole is fixedly connected to a compressed air hose. The auxiliary toe is fixedly connected to the first end of the auxiliary hole. The first end of a flexible probe sleeve is fixedly connected to the second end of the eddy current detection hole, and the second end of the flexible probe sleeve is connected to an eddy current probe. By simultaneously providing eddy current detection holes, positioning holes, and auxiliary holes on the positioning plate, the positioning holes purge and dry the heat transfer tubes, while the eddy current detection holes perform eddy current detection on adjacent, already dried heat transfer tubes. This allows for simultaneous purging / drying and eddy current detection, improving overall maintenance efficiency, reducing operation time, and minimizing radiation exposure.

[0037] Optionally, the heat transfer tube detection structure 100 also includes a handle 110; the handle 110 is hollow inside, and the first end of the handle 110 is fixedly connected to the second end of the positioning hole 103; the second end of the handle 110 is fixedly connected to the compressed air hose 109.

[0038] The heat transfer tube detection structure 100 includes a handle 110, which can be a retractable handle to allow workers to move away from manholes, improving the working environment and reducing radiation exposure. The first end of the handle 110 is fixedly connected to the second end of the positioning hole 103. The second end of the handle 110 is for workers to hold. The handle 110 is hollow, reducing the overall weight of the heat transfer tube detection structure 100. Together with the positioning hole 103 and positioning toe 105, it provides a transmission channel for compressed air, allowing compressed air introduced through the compressed air hose 109 to sequentially blow and dry the heat transfer tube via the handle 110, positioning hole 103, and positioning toe 105.

[0039] Optionally, the heat transfer tube detection structure 100 also includes an air pipe connector 111; the second end of the handle 110 is fixedly connected to the compressed air hose 109 via the air pipe connector 111. To ensure the connection effect between the handle 110 and the compressed air hose 109, an air pipe connector 111 is provided between the handle 110 and the compressed air hose 109. The air pipe connector 111 is used for quick connection between the second end of the handle 110 and the compressed air hose 109, and can also ensure the connection sealing and ensure the purging and drying effect of the heat transfer tube.

[0040] Optionally, the heat transfer tube detection structure 100 further includes a first fixing member 112; the positioning toe 105 and the handle 110 are fixedly connected to the positioning hole 103 through the first fixing member 112. The first fixing member 112 is provided in the positioning hole 103 and is fixedly connected to the positioning hole 103. The first fixing member 112 is provided with threads or buckles. The positioning toe 105 is screwed or snapped to the first fixing member 112, which facilitates the replacement of the positioning toe 105 after it wears out.

[0041] Optionally, the heat transfer tube detection structure 100 also includes a second fixing member 113; the auxiliary toe 106 is fixedly connected to the auxiliary hole 104 through the second fixing member 113. The second fixing member 113 is provided in the auxiliary hole 104 and is fixedly connected to the auxiliary hole 104. The second fixing member 113 is provided with threads or buckles. The auxiliary toe 106 is screwed or snapped to the second fixing member 113, which facilitates the replacement of the auxiliary toe 106 after wear.

[0042] Optionally, the heat transfer tube detection structure 100 also includes a third fixing member 114; the flexible probe sleeve 107 is fixedly connected to the eddy current detection hole 102 through the third fixing member 114. The third fixing member 114 is provided inside the eddy current detection hole 102 and is fixedly connected to the eddy current detection hole 102. The third fixing member 114 is provided with threads or snaps. The flexible probe sleeve 107 is screwed or snapped to the third fixing member 114 to ensure the connection effect between the flexible probe tube and the positioning plate 101.

[0043] Optionally, the centers of the eddy current detection hole 102, the positioning hole 103, and the auxiliary hole 104 are located on the same straight line. Specifically, based on the principle of "three points in a line," the centers of the eddy current detection hole 102, the positioning hole 103, and the auxiliary hole 104 are set on the same straight line. This ensures that when the positioning toe 105 and the auxiliary toe 106 contact the heat transfer tube, the eddy current detection hole 102 also corresponds to the heat transfer tube. This allows eddy current detection and heat transfer tube purging and drying to be performed simultaneously, improving overall maintenance efficiency, reducing operation time, and decreasing the radiation dose received.

[0044] Optionally, the positioning toe 105 is the same size as the auxiliary toe 106. The positioning toe 105 and the auxiliary toe 106 have the same length and width. The positioning toe 105 and the auxiliary toe 106 can also be made of the same material, which effectively reduces the manufacturing difficulty of the heat transfer tube detection structure 100, while ensuring the stability of the heat transfer tube detection structure 100, thereby ensuring the purging and drying effect and eddy current detection effect of the heat transfer tube.

[0045] Optionally, the auxiliary toe 106 is a solid internal metal structure. Specifically, the auxiliary toe 106, in conjunction with the positioning toe 105, plays a role in stabilizing the heat transfer tube detection structure 100 during use. The auxiliary toe 106 can be designed to ensure its structural stability, thereby ensuring the stability of the heat transfer tube detection structure 100. The auxiliary toe 106 and the positioning toe 105 are typically made of stainless steel, which has a lower hardness than the tube sheet and heat transfer tube, increasing their durability. The auxiliary toe 106 and the auxiliary hole 104 are detachable, facilitating easy replacement when the auxiliary toe 106 wears out.

[0046] Based on the same inventive concept, this utility model embodiment also provides a heat transfer pipe detection device. This device includes the heat transfer pipe detection structure described in any embodiment of this utility model. The device may further include a protective cover for protecting the heat transfer pipe detection structure when it is not in use. Therefore, the heat transfer pipe detection device provided by this utility model embodiment includes the technical features of the heat transfer pipe detection structure provided in any embodiment of this utility model, and can achieve the beneficial effects of the heat transfer pipe detection structure provided in any embodiment of this utility model. Similarities can be found in the above description of the heat transfer pipe detection structure provided by this utility model embodiment, and will not be repeated here.

[0047] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A heat transfer tube detection structure, characterized in that, The heat transfer tube detection structure includes: A positioning plate, the positioning plate comprising eddy current detection holes, positioning holes and auxiliary holes arranged at intervals; The positioning toe is hollow inside, and is fixedly connected to the first end of the positioning hole, while the second end of the positioning hole is fixedly connected to a compressed air hose. An auxiliary toe, wherein the auxiliary toe is fixedly connected to the first end of the auxiliary hole; A flexible probe sleeve, the first end of which is fixedly connected to the second end of the eddy current detection hole, and the second end of the flexible probe sleeve is connected to the eddy current probe.

2. The heat transfer tube detection structure according to claim 1, characterized in that, The heat transfer tube detection structure also includes a handle; The handle is hollow inside, and the first end of the handle is fixedly connected to the second end of the positioning hole; the second end of the handle is fixedly connected to the compressed air hose.

3. The heat transfer tube detection structure according to claim 2, characterized in that, The heat transfer tube detection structure also includes a gas pipe connector; The second end of the handle is fixedly connected to the compressed air hose via the air pipe connector.

4. The heat transfer tube detection structure according to claim 2, characterized in that, The heat transfer tube detection structure also includes a first fixing element; The positioning toe and the handle are fixedly connected to the positioning hole via the first fixing member.

5. The heat transfer tube detection structure according to claim 1, characterized in that, The heat transfer tube detection structure also includes a second fixing component; The auxiliary toe is fixedly connected to the auxiliary hole via the second fixing member.

6. The heat transfer tube detection structure according to claim 1, characterized in that, The heat transfer tube detection structure also includes a third fixing component; The flexible probe sleeve is fixedly connected to the eddy current detection hole through the third fixing member.

7. The heat transfer tube detection structure according to claim 1, characterized in that, The center of the eddy current detection hole, the center of the positioning hole, and the center of the auxiliary hole are located on the same straight line.

8. The heat transfer tube detection structure according to claim 1, characterized in that, The size of the positioning toe is the same as the size of the auxiliary toe.

9. The heat transfer tube detection structure according to claim 1, characterized in that, The auxiliary toe has a solid metal structure inside.

10. A heat transfer tube testing device, characterized in that, The heat transfer tube detection structure includes any one of claims 1-9.

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