Handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing member bending device

Abstract

The application discloses a nuclear power steam generator thermocouple wire and fixing piece bending device. The device clamps and fixes two ends of the fixing piece respectively, inserts the thermocouple wire into the fixing piece, and realizes S-shaped bending of the thermocouple wire and the fixing piece by pressing one end of the fixing piece. In the bending process, the bending slider and the lower clamping plate of the hot end realize smooth guiding to the fixing piece, so that no indentation is caused on the hot end thermocouple wire, and the internal thermal sensing wire of the thermocouple wire is not damaged. The bending size can be determined by measuring the distance of the bending slider extending out of the shell.

Description

Technical Field

[0001] This invention relates to the field of nuclear power steam generator manufacturing, specifically to a bending device for thermocouple wires and thermocouple wire fixing components inside the steam outlet pipe box of a steam generator. Background Technology

[0002] As one of the most critical pieces of equipment in a nuclear power plant system, the nuclear steam generator converts the heat from the nuclear reactor into steam at a temperature of 600–650°C to drive the turbine generator set to produce electricity. To accurately measure the heat exchange efficiency of the heat exchange tubes in different areas at the steam outlet, multiple sets of thermocouples need to be installed at the steam outlet to monitor the temperature at different tube opening locations.

[0003] Thermocouples are relatively precise and expensive thermal sensing elements. Each thermocouple consists of two temperature sensing wires wrapped in alumina powder within a sealed stainless steel shell with a diameter of 3 mm and a wall thickness of 0.3 mm. There are hundreds of thermocouples, arranged in a strict route on an orifice plate inside a steam outlet pipe box with a diameter of 800 mm. The length of each thermocouple varies depending on the location of the measuring pipe hole.

[0004] During equipment operation, the steam velocity at the orifice plate reaches as high as 28 m / s. The thermocouple wires must be welded to the orifice plate; otherwise, they will be blown off by the high-speed steam. The outer wall of the thermocouple wires is too thin to be directly welded; a wire fixing component is required for welding and securing them to the orifice plate. The wire fixing component is a tubular part fitted over the outside of the thermocouple wire, with a wall thickness of 1.5 mm, which meets the welding requirements.

[0005] like Figure 1 As shown, each thermocouple wire 91 needs to be fixed by a different number of thermocouple wire fixing pieces 92 from the heat transfer end, depending on its length and arrangement on the orifice plate. The last thermocouple wire fixing piece 92 that the thermocouple wire 91 reaches the temperature measuring tube hole needs to be S-shaped and then welded to the orifice plate. This not only achieves the effect of axially fixing the thermocouple wire 91 to the thermocouple wire fixing piece 92, but also raises the thermocouple wire 91 and the orifice plate by a certain distance, reducing the impact of steam on the thermocouple wire 91 and protecting the thermocouple wire. The bending dimensions of thermocouple wire 91 and thermocouple wire fixing component 92 have strict requirements. The design requires the thermocouple wire 91 to extend 5±0.5mm beyond the fixing component 92. During bending, the thermocouple wire 91 will experience slight elongation; excessive elongation will break the internal heat sensing wire. The design requires that each thermocouple wire 91 bend no more than twice and that no wrinkles or pits deeper than 0.1mm are allowed. The height difference between the axes of the bent thermocouple wire 91 should be 4±1mm, and the bends should be smooth without sharp edges. In actual operation, the bending of thermocouple wire 91 and thermocouple wire fixing component 92 presents the following difficulties:

[0006] (1) The bending of metal materials usually involves clamping one end and bending the other end with tools and molds. However, the thermocouple wire fixing part has a diameter of 6mm and a length of only 20mm. According to the bending size, the bending clamping end is only about 4mm. Ordinary tools are difficult to clamp it and it is easy to clamp the thermocouple wire fixing part and the thermocouple wire into an ellipse.

[0007] (2) The number of thermocouple wire fixing parts on each thermocouple wire needs to be increased or decreased according to the layout route. All thermocouple wire fixing parts need to be inserted from the heat transfer end of the thermocouple wire. In this way, the end thermocouple wire fixing parts cannot be bent in advance on the outside of the tube box by equipment. They can only be bent in the steam outlet tube box near the orifice plate. The tube box space is small, and the operation is difficult.

[0008] (3) The dimensions of the thermocouple wire extension and the bending forming dimensions are strictly required. It is difficult to form it in one go. If repeated adjustments are made, the outer wall of the thermocouple wire will be wrinkled, dented or even cracked.

[0009] (4) Thermocouple installation is the last step in the manufacturing of the steam generator. At this time, the inside of the equipment has been thoroughly cleaned and dried. The installation and testing cycle must not exceed 14 days, otherwise a large amount of dust and water vapor will enter the equipment, causing internal pollution and corrosion. Since the installation space only allows one person to operate, the bending operation must be strictly time-sensitive and not too complicated.

[0010] In summary, the bending space of thermocouple wires and thermocouple fixing components is very small, and the requirements for forming size, pass rate and efficiency are strict, which makes the operation difficult and risky.

[0011] Due to the aforementioned problems, there is an urgent need for a bending device that can be easily operated inside the steam outlet pipe box of a nuclear power steam generator, and can ensure the bending accuracy and efficiency of the thermocouple wire and the thermocouple wire fixing component. Summary of the Invention

[0012] To overcome the aforementioned problems, the inventors conducted in-depth research and developed a simple, single-person operation device for bending thermocouple wires and their fixing components within the steam outlet pipe box of a nuclear power plant steam generator. This device clamps and fixes both ends of the thermocouple fixing component using an upper clamping plate on the hot end of the outer shell, and bending sliders, clamps, and a lower clamping plate on the hot end inside the shell. After the thermocouple wire is passed through the fixing component to the required depth, the bending slider's set screw is pre-tightened, and the bending slider is pressed down, causing radial displacement at one end of the fixing component, achieving an S-shaped bend between the thermocouple wire and the fixing component. During the bending process, the bending slider and the lower clamping plate on the hot end provide smooth guidance for the fixing component, preventing indentations on the hot-end thermocouple wire and avoiding damage to the internal thermal sensing wire. The bending dimensions can be determined simply by measuring the distance the bending slider extends beyond the outer shell, thus completing this invention.

[0013] Specifically, the object of the present invention is to provide the following aspects:

[0014] On the one hand, a handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device is provided. By clamping and fixing both ends of the thermocouple wire fixing component, inserting the thermocouple wire into the thermocouple wire fixing component, and pressing down one end of the thermocouple wire fixing component, the thermocouple wire and the thermocouple wire fixing component are bent into an S-shape together.

[0015] On the other hand, a method for bending thermocouple wires and thermocouple wire fixing components in a nuclear power steam generator is provided, characterized in that it is achieved using the handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device described in the first aspect.

[0016] The beneficial effects of this invention include:

[0017] (1) The handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device provided by the present invention is ingeniously designed and low in cost. It can achieve S-shaped bending of thermocouple wire and thermocouple wire fixing component together by only using the pre-tightening of the clamping top screw 7 as power. It provides a reasonable clamping structure, bending guide and power system for bending thermocouple wire and thermocouple wire fixing component together with small size, difficult forming or hard material.

[0018] (2) The handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device provided by the present invention is small in size and easy to use. Only one person can complete multiple processes such as positioning, installation, clamping and bending of the fixing component and thermocouple wire by hand.

[0019] (3) The handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device provided by the present invention, during the bending process, the thermocouple wire fixing component is smoothly guided by the bending slider and the hot end lower clamping plate, which will not cause indentation on the hot end thermocouple wire, and avoids the sharp corner deformation of the fixing component after bending, which will damage the internal thermal sensing wire of the thermocouple wire.

[0020] (4) The handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device provided by the present invention clamps and fixes both ends of the thermocouple wire fixing component, and clamps it by bending slider top screw, lower clamping plate top screw and clamping seat top screw, ensuring that the thermocouple wire fixing component does not shake when bending and remains relatively stable with the thermocouple wire, so as to realize the simultaneous bending of the thermocouple wire fixing component and the thermocouple wire.

[0021] (5) The method of bending thermocouple wires and thermocouple wire fixing parts using a handheld nuclear power steam generator bending device provided by the present invention is convenient to operate. It can not only control the length of the thermocouple wire extending out of the thermocouple wire fixing part, but also determine the bending height by simply measuring the distance of the bending slider extending out of the shell after bending. It can be accurately shaped in one bend. Attached Figure Description

[0022] Figure 1 -A) shows a schematic diagram of the arrangement of the thermocouple wires and wire fixing members of the present invention on the perforated plate;

[0023] Figure 1 -B) shows Figure 1 -A) Schematic diagram of the HH section;

[0024] Figure 1 -C) shows Figure 1 -B) View from A;

[0025] Figure 2 A schematic diagram of the bending device for thermocouple wires and thermocouple wire fixing components in a handheld nuclear power steam generator according to a preferred embodiment of the present invention is shown.

[0026] Figure 3 -A) shows Figure 2 The main view;

[0027] Figure 3 -B) shows Figure 2 The left view;

[0028] Figure 4 -A) shows along Figure 3 -B) Schematic diagram of section AA;

[0029] Figure 4 -B) shows along Figure 3 -A) Schematic diagram of section BB;

[0030] Figure 5 -A) shows the leading edge of the hot-junction thermocouple bending. Figure 3 -B) Schematic diagram of section AA;

[0031] Figure 5 -B) shows the hot junction thermocouple after bending along... Figure 3 -B) Schematic diagram of section AA;

[0032] Figure 6 -A) Shows the front view of the casing;

[0033] Figure 6 -B) shows along Figure 5 -A) Schematic diagram of the CC section;

[0034] Figure 7 A schematic diagram of the shell structure is shown;

[0035] Figure 8 -A) Shows a front view of the hot end clamping plate;

[0036] Figure 8 -B) shows along Figure 7 -A) Schematic diagram of the FF section;

[0037] Figure 9 -A) Shows the main view of the lower clamping plate stop;

[0038] Figure 9 -B) shows along Figure 8 -A) Schematic diagram of GG cross section;

[0039] Figure 10 -A) Shows the main view of the stiffening plate;

[0040] Figure 10 -B) shows a side view of the stiffener plate;

[0041] Figure 11 -A) shows the main view of the bent slider;

[0042] Figure 11 -B) shows along Figure 11 -A) Schematic diagram of the DD section;

[0043] Figure 12 -A) Shows the main view of the clamp;

[0044] Figure 12 -B) shows a side view of the clamp;

[0045] Figure 13 -A) Shows a front view of the lower clamping plate at the hot end;

[0046] Figure 13 -B) shows along Figure 12 -A) Schematic diagram of the EE cross-section;

[0047] Figure 14 The diagram shows the structure of the hot-end thermocouple after bending, as required by industrial standards in Example 1.

[0048] Explanation of icon numbers:

[0049] 1-Outer shell;

[0050] 11-Shell;

[0051] 111 - Bent bolt threaded hole;

[0052] 112 - Pin threaded hole;

[0053] 12-Hot end upper clamping plate;

[0054] 13-Lower clamping plate stop;

[0055] 131-Dual-line positioning keyway;

[0056] 132 - Lower clamp plate set screw threaded hole;

[0057] 14-rib plate;

[0058] 15-Card Slot I;

[0059] 16-Card Slot II;

[0060] 17-Card Slot III;

[0061] 2- Bending slider;

[0062] 21- Bending mold slot;

[0063] 22-Clamping seat slide groove;

[0064] 23-Anti-drop slot;

[0065] 24 - Clamping seat set screw threaded hole;

[0066] 3-Clamping seat;

[0067] 4-Lower clamping plate for hot end;

[0068] 5-Bending slider set screw;

[0069] 6-Lower clamp set screw;

[0070] 7-Clamping set screw;

[0071] 8-Even-line locating key;

[0072] 81-Bent Bolt;

[0073] 9-Hot junction thermocouple;

[0074] 91-Thermocouple wire;

[0075] 92-Dual-line fixing element;

[0076] 10-Pin;

[0077] 18-hole plate;

[0078] 19-Pipe Hole;

[0079] 20 - Solder joint;

[0080] 30-Hot end;

[0081] X - Thermocouple wire extension length beyond the thermocouple wire fixing component;

[0082] Y-bending slider extends beyond the outer casing. Detailed Implementation

[0083] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0084] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0085] On the one hand, according to the present invention, a bending device for thermocouple wire and thermocouple wire fixing member of nuclear power steam generator is provided. The device is handheld. By clamping and fixing both ends of the thermocouple wire fixing member 92, the thermocouple wire 91 is inserted into the thermocouple wire fixing member 92, and one end of the thermocouple wire fixing member 92 is pressed down to achieve S-shaped bending of the thermocouple wire 91 and the thermocouple wire fixing member 92 together.

[0086] In the existing technology, the thermocouple wire 91 used to detect the temperature at the steam outlet of a nuclear power steam generator is expensive, costing tens of thousands of yuan per meter. However, due to the very strict requirements on the dimensions of the thermocouple wire 91 extending from the wire fixing component 92 and the bending and forming dimensions, it is difficult to form in one go. Repeated adjustments can easily lead to defects such as wrinkles, dents, or even cracks on the outer wall of the thermocouple wire 91 and / or the wire fixing component 92. Once wrinkles, dents, or cracks appear on the outer wall of the thermocouple wire 91 and / or the wire fixing component 92, the alumina powder in the thermocouple wire 91 will be blown away at a steam flow rate (28m / s), directly causing the thermocouple wire 91 to be scrapped. In addition, the processing equipment currently commonly used is voltage or hydraulic equipment, which has poor sensitivity and cannot be processed according to specific processing dimensions. Even if voltage or hydraulic equipment has high processing precision, the operating tube box is extremely small, making operation inconvenient.

[0087] The aforementioned bending device for thermocouple wires and thermocouple wire fixing parts in the nuclear power steam generator is handheld. Even in a confined operating box, only one person is needed to efficiently process the thermocouple wires 91 and thermocouple wire fixing parts 92.

[0088] Furthermore, during the bending process, the dipole fixing member 92 achieves smooth guidance through the bending slider 2 and the hot end lower clamping plate 4, and determines the bending dimension by measuring the distance of the bending slider 2 extending out of the outer shell 1, thereby achieving high-precision S-shaped bending.

[0089] The smooth guide wire fixing component 92 plays a protective role, achieving the stretching or extension of the thermocouple wire 91 and the wire fixing component 92 while preventing wrinkles, dents or cracks in the wire fixing component 92; moreover, the bending size can be determined by measuring the distance of the bending slider 2 extending out of the outer shell 1, without the need for any equipment, thus meeting the forming requirements of the hot-end thermocouple 9.

[0090] According to a preferred embodiment, the device includes a housing 1, a bending slider 2, a clamping seat 3, and a lower hot-end clamping plate 4. The thermocouple wire 91 is clamped and fixed at both ends by the upper hot-end clamping plate 12 included in the housing 1, and the bending slider 2, clamping seat 3, and lower hot-end clamping plate 4 inside the housing 1. Then, the thermocouple wire 91 is passed through the thermocouple wire fixing member 92, and the bending slider set screw 5 is pressed downwards, achieving an S-shaped bend of the thermocouple wire 91 and the thermocouple wire fixing member 92 together. Figure 2-4 As shown.

[0091] The bending slider 2, clamp 3, and lower hot-end clamp 4 can slide inside the outer casing 1. In use, the bending slider 2 and clamp 3 fix the hot-end thermocouple 9 (thermocouple wire 91 and thermocouple wire fixing member 92), and the lower hot-end clamp 4 and the upper hot-end clamp 12 included in the outer casing 1 fix the hot-end thermocouple 9 (thermocouple wire 91 and thermocouple wire fixing member 92). The bending slider set screw 5 is pressed downward. At this time, the clamp 3 and clamp set screw 7 move downward under the power of the bending slider set screw 5. By measuring the distance of the bending slider 2 extending out of the outer casing 1, the bending size is determined, so that the thermocouple wire 91 and the thermocouple wire fixing member 92 are bent into an S-shape together.

[0092] In this invention, the thermocouple fixing member 92 is clamped by the upper hot end clamping plate 12 included in the outer shell 1, as well as the bending slider 2, clamping seat 3 and lower hot end clamping plate 4 in the outer shell 1, to ensure that the thermocouple fixing member 92 will not wobble when bent, and will be relatively stable with the thermocouple 91, and will not cause indentation on the thermocouple 91. It can be accurately shaped by bending only once.

[0093] In this invention, the outer shell 1 includes a shell 11, a hot end upper clamping plate 12, a lower clamping plate stop 13, and a stiffening plate 14.

[0094] Furthermore, the shell 11 is a hollow cuboid structure with only three surfaces: a top surface and left and right side walls. The left and right side walls of the shell 11 have three slots that respectively engage with the upper clamping plate 12, the lower clamping plate block 13, and the stiffening plate 14 at the hot end. The shell 11, the upper clamping plate 12, the lower clamping plate block 13, and the stiffening plate 14 are fixedly connected by welding, forming a square cavity for the lower clamping plate 4, the clamping seat 3, and the bent slider 2 at the heating end to slide. Figure 6 As shown.

[0095] Among them, a slot I15 is provided on the upper part of one end of the left and right side walls of the shell 11 to engage with the upper clamping plate 12 of the hot end; a slot II16 is provided on the lower part of the same end of the slots on the left and right side walls of the shell 11 to engage with the lower clamping plate block 13; and a slot III17 is provided on the other end of the left and right side walls of the shell 11 to engage with the stiffening plate 14. Figure 7 As shown.

[0096] In use, the clamp 3 and the bending slider 2 are placed in the middle of the outer shell 1, which is actually the middle of the outer shell 11. The clamp 3 and the bending slider 2 clamp part of the thermocouple wire 91 and the thermocouple wire fixing member 92. The hot end lower clamp 4 is placed in the outer shell 11 and fits against the lower clamp block 13. It clamps part of the thermocouple wire 91 and the thermocouple wire fixing member 92 with the hot end upper clamp 12. The stiffener 14 is used for inserting and removing the thermocouple wire 91 and the thermocouple wire fixing member 92.

[0097] Furthermore, the top surface of the housing 11 is provided with a bent bolt threaded hole 111 for the bent slider set screw 5 to be screwed into, and the lower end of one side wall is provided with a pin threaded hole 112 for the pin 10 to be screwed into, such as Figure 7 As shown.

[0098] Specifically, by screwing the bending slider set screw 5 into the bending bolt threaded hole 111, the connection between the bending slider set screw 5 and the outer shell 1 is achieved, and downward pressure is achieved at the same time; by screwing the pin 10 into the pin threaded hole 112 into the anti-dislodgement groove 23 in the bending slider 2, the bending slider 2 is prevented from sliding out of the outer shell 1. At this time, the bending slider 2 and the hot end lower clamping plate 4 can slide up and down in the square cavity of the outer shell 1.

[0099] According to a preferred embodiment, the bending slider set screw 5 includes a head and a helical rod. The surface of the helical rod has threads that mate with the threaded hole 111 of the bending bolt. Figure 2 As shown.

[0100] In this invention, the hot-end upper clamping plate 12 is a solid cuboid structure. Preferably, its bottom is provided with a thermocouple fixing groove with the same outer diameter as the thermocouple fixing member 92 and a coaxial semi-circular groove to allow the thermocouple wire 91 to pass through. Figure 8 As shown.

[0101] In this invention, the lower clamping plate stop 13 is L-shaped, with a lower clamping plate set screw threaded hole 132 on one side for the lower clamping plate set screw to be screwed in, and a double-line positioning keyway 131 machined on the other side, such as... Figure 9 As shown.

[0102] The structure of the lower clamping plate set screw 6 is similar to that of the bending slider set screw 5, including a head and a spiral rod. The surface of the spiral rod has threads that mate with the threaded hole 132 of the lower clamping plate set screw. During installation, the side of the lower clamping plate stop 13 with the threaded hole 132 of the lower clamping plate set screw is engaged with the slot II 16 of the housing 11. The lower clamping plate set screw 6 is screwed into the threaded hole 132 of the lower clamping plate set screw, pressing against the bottom of the hot end lower clamping plate 4. The side of the lower clamping plate stop 13 with the even-line positioning keyway 131 is fitted against the two side walls of the housing 11.

[0103] In practice, the thermocouple wire 91 is required to extend 5±0.5mm beyond the thermocouple wire fixing member 92. Therefore, the thickness of the side of the lower clamping plate block 13 where the thermocouple wire positioning keyway 131 is opened is 0.5~5.5mm, more preferably 1.5~4mm, and even more preferably 2~3mm.

[0104] Furthermore, the sum of the width of the coaxial semicircular groove opened on the upper clamping plate 12 of the hot end and the thickness of one side of the thermocouple positioning keyway 131 opened on the lower clamping plate block 13 is the required length of the thermocouple wire 91 extending out of the thermocouple wire fixing member 92, that is, 5±0.5mm.

[0105] In a preferred embodiment, the bottom of the lower clamping plate block 13 is chamfered to prevent hand injuries during the bending and processing of the thermocouple wire 91 and the thermocouple wire fixing member 92, thereby improving safety during use.

[0106] To further determine the length of the thermocouple wire 91 extending out of the thermocouple wire fixing member 92, a thermocouple wire positioning key 8 can be movably connected to one side of the lower clamping plate block 13 where the thermocouple wire positioning keyway 131 is opened.

[0107] The dipole positioning key 8 has a dipole positioning threaded hole for the bending bolt 81 to be screwed into. The hole has a small diameter and a large diameter. The large diameter is the same as the size of the head of the bending bolt 81, and the small diameter is the same as the size of the dipole positioning keyway 131. The dipole positioning set screw 82 is screwed into the dipole positioning threaded hole and the dipole positioning keyway 131 to achieve the connection between the dipole positioning key 8 and the lower clamping plate stop block 13.

[0108] According to the present invention, the thermocouple positioning key 8 is a plate-shaped structure, and its height is higher than the bottom end of the upper clamping plate 12 of the hot end, for example, 1 to 2 mm higher than the bottom end of the upper clamping plate 12 of the hot end, so that the thermocouple 91 extends out of the thermocouple fixing member 92 through the thermocouple fixing member 92.

[0109] According to the preferred embodiment, a groove is formed on one side of the dipole positioning keyway 131 of the lower clamping plate block 13 to engage with the dipole positioning key 8, which can save processing raw materials and facilitate positioning.

[0110] In this invention, the stiffening plate 14 is a plate-like structure with holes. The width of the holes is slightly larger than the outer diameter of the thermocouple fixing member 92, and the height is greater than the distance between the top and bottom ends of the thermocouple 91 after it passes through the thermocouple fixing member 92 and undergoes an S-shaped bend. This facilitates the insertion and removal of the thermocouple 91 and the thermocouple fixing member 92 after bending. Figure 10 As shown.

[0111] The shape of the hole only needs to meet the above requirements and can be any one of triangular, rhomboid, square, circular, or oblong holes, preferably oblong holes, to facilitate the insertion and removal of the thermocouple wire 91 and the thermocouple wire fixing member 92. Figure 10 As shown.

[0112] In this invention, the shell 11, the upper hot end clamping plate 12, the lower clamping plate stop 13, and the stiffening plate 14 are fixedly installed by welding to form the outer shell 1. This not only provides a square cavity for the sliding of the lower hot end clamping plate 4, the clamping seat 3, and the bending slider 2, but also ensures that the parts of the outer shell 1 have high rigidity after welding. When the bending slider set screw 5 frequently provides bending preload, it will not deform or break, thus affecting the precision machining of the thermocouple wire 91 and the thermocouple wire fixing part 92 and the service life of the outer shell 1.

[0113] Since the thermocouple wire 91 and the thermocouple wire fixing component 92 are soft, the thermocouple wire 91 is usually made of two temperature sensing wires wrapped with alumina powder, and the thermocouple wire fixing component 92 is made of stainless steel, such as 304 stainless steel. The rigidity of the material of the outer shell 1 only needs to be greater than the rigidity of the material of the thermocouple wire fixing component 92. It is preferably selected from carbon steel, titanium alloy, high manganese steel, tungsten steel, etc. For example, carbon steel is widely available and inexpensive.

[0114] In this invention, the bending slider 2 is a block that slides within the inner cavity of the outer casing 1, including an upper top surface, a lower bottom surface, and left and right side walls. The upper top surface, lower bottom surface, and left and right side walls form a clamping groove 22, which can accommodate the clamping seat 3. Preferably, one side wall of the bending slider 2 is provided with an anti-drop groove 23, which is secured by a pin 10 to prevent the bending slider 2 from sliding out of the outer casing 1 after the thermocouple wire 91 and the thermocouple wire fixing member 92 are removed.

[0115] Furthermore, the upper top surface of the bending slider 2 is provided with a bending mold groove 21.

[0116] In use, the clamp 3 is placed in the clamp slide groove 22. The clamp 3 has a groove with the same shape as the bending mold slot 21. The thermocouple wire 91 and the thermocouple wire fixing member 92 are placed between the bending mold slot 21 and the groove of the clamp 3 to achieve bending of the thermocouple wire 91 and the thermocouple wire fixing member 92.

[0117] According to the present invention, the shape of the bending mold groove 21 is semi-circular, semi-elliptical, square, triangular or V-shaped, preferably V-shaped.

[0118] The V-shape is not only easy to process, but also highly versatile, and can stably hold the thermocouple wire 91 and the thermocouple wire fixing component 92 in place.

[0119] According to the preferred embodiment, a bending arc is provided in the bending die groove 21 at the position where the thermocouple wire 92 contacts and is to be bent, so as to achieve smooth guidance. That is, while the thermocouple wire 91 and the thermocouple wire fixing member 92 bend together in an S-shape, no wrinkles or sharp corners are generated, thus preventing the thermocouple wire from breaking.

[0120] Furthermore, the radius R of the bending arc does not need to be strictly required; it only needs to ensure that the thermocouple wire 91 and the wire fixing member 92 are bent into an S-shape without creases or indentations. However, an excessively small radius of curvature will still cause defects such as bending, indentation, or dents on the outer wall of the thermocouple wire 91 and / or the wire fixing member 92, while an excessively large radius of curvature will result in too small a curvature or too gentle a bend, failing to meet the processing requirements.

[0121] Preferably, the radius of the arc R is 2mm to 6mm, more preferably, the radius of the arc R is 3mm to 5mm, for example, 4mm.

[0122] According to the present invention, the lower bottom surface of the bending slider 2 is provided with a clamping screw threaded hole 24 for the clamping screw 7 to be screwed into, so that the clamping screw 7 can be moved up and down along the clamping screw threaded hole 24, such as... Figure 5 and Figure 11 As shown.

[0123] According to a preferred embodiment, the clamping seat set screw 7 has a structure similar to the bending slider set screw 5, including a head and a spiral rod. The surface of the spiral rod has a thread that mates with the threaded hole 24 of the clamping seat set screw.

[0124] According to the present invention, the clamp 3 is a cuboid with a semi-circular, semi-elliptical, square, triangular or V-shaped groove. The length of the cuboid and the length of the groove are preferably completely matched with the length of the clamp groove 22 provided at the center of the bending slider 2, so as to avoid the gaps that cause wrinkles when the thermocouple wire 91 and the thermocouple wire fixing member 92 are bent.

[0125] Preferably, the shape of the groove in the clamping seat 3 is the same as the shape of the bending die groove 21, for example, V-shaped. Figure 12 As shown.

[0126] Before bending the thermocouple wire 91 and the thermocouple wire fixing member 92, place the clamp 3 in the square hole of the bending slider 2, clamp and fix part of the thermocouple wire fixing member 92 between the clamp 3 and the bending die groove 21 of the bending slider 2, screw the clamp set screw 7 into the clamp set screw threaded hole 24, and press against the bottom of the clamp 3 until the thermocouple wire fixing member 92 is clamped.

[0127] According to the present invention, the lower hot-end clamping plate 4 is a cuboid with a coaxial semi-circular groove having the same outer diameter as the thermocouple fixing member 92 and satisfying the passage of the thermocouple wire 91 as the upper hot-end clamping plate 12, and further having a bent arc at the end of the coaxial semi-circular groove, similar to that of the bent slider 2, such as... Figure 13 As shown.

[0128] Furthermore, another part of the dipole fixing member 92 is clamped and fixed between the hot end lower clamping plate 4 and the hot end upper clamping plate 12. The lower clamping plate set screw 6 is screwed into the lower clamping plate set screw threaded hole 132, pressing against the bottom of the hot end lower clamping plate 4 until the dipole fixing member 92 is clamped.

[0129] In this invention, the coaxial semi-circular grooves opened on the lower hot end clamping plate 4 and the upper hot end clamping plate 12 are fully engaged with the outer diameter of the extended portion of the thermocouple wire 91 and the thermocouple wire 92, thus cleverly realizing the precise bending of the thermocouple wire 92 and the thermocouple wire 91.

[0130] According to the present invention, the hot end lower clamping plate 4 is placed in the square cavity of the outer shell 1 and fits against the lower clamping plate block 13. The clamping seat 3 is placed in the bending slider 2 and sent into the outer shell 1 together. The pin 10 is screwed into the anti-drop groove 23 from the side of the outer shell 1 to prevent it from sliding out of the outer shell 1. At this time, the bending slider 2 and the hot end lower clamping plate 4 can slide freely and precisely up and down in the outer shell 1.

[0131] Meanwhile, since the bending contact points between the hot end lower clamping plate 4 and the dipole fixing member 92, as well as between the bending slider 2 and the dipole fixing member 92, are all curved arcs and smooth guide surfaces, no edge marks will be caused to the dipole fixing member 92 during the bending process.

[0132] Before bending the thermocouple wire 91 and the thermocouple wire fixing member 92, the lower end face of the bending slider 2 is flush with the lower end face of the outer shell 1; during bending, the thermocouple wire 91 and the thermocouple wire fixing member 92 between the bending die groove 21 and the clamping seat 3, and between the lower hot end clamping plate 4 and the upper hot end clamping plate 12, are bent together in an S-shape by the power action of the bending slider set screw 5, as shown. Figure 5 As shown. Regardless of the shape of the thermocouple fastener 92 and the thermocouple wire 91 before bending or the S-shape after bending, given the structure of the rib plate 14 holes, the thermocouple fastener 92 and the thermocouple wire 91 can be inserted and removed after bending, achieving a wrinkle-free and indentation-free bending of the thermocouple fastener 92 and the thermocouple wire 91.

[0133] Furthermore, the length of the thermocouple wire 91 extending beyond the thermocouple wire fixing member 92 is controlled by the thermocouple wire positioning key 8. The interaction between the components achieves high-precision, wrinkle-free bending between the thermocouple wire 91 and the thermocouple wire fixing member 92.

[0134] In this invention, the thermocouple wire 91 and the thermocouple wire fixing member 92 can be bent into an S-shape together by using only a simple mechanical structure and the pre-tightening of the bending slider top screw 5, the lower clamping plate top screw 6, and the clamping seat top screw 7 as power. This provides a reasonable clamping structure, bending guide and power system for bending the thermocouple wire 91 and the thermocouple wire fixing member 92 together when they are small in size, difficult to form or hard in material.

[0135] On the other hand, the method for bending thermocouple wires and thermocouple wire fixing components in a nuclear power steam generator according to the present invention is implemented using the aforementioned handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device, the method comprising:

[0136] Step 1: Fix both ends of the thermocouple fixing member 92 and pass the thermocouple wire 91 through the thermocouple fixing member 92;

[0137] Step 2: Press down and bend the slider screw 5;

[0138] Step 3: Pull out the S-shaped bent thermocouple wire 91 and thermocouple wire fixing piece 92 together through the waist-shaped hole of the stiffener 14 of the outer shell 1.

[0139] Specifically:

[0140] Before operation, the following operation is performed using the handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing bending device: place the hot end lower clamping plate 4 in the square cavity of the outer shell 1 and fit it with the lower clamping plate block 13; place the clamping seat 3 in the bending slider 2 and send it into the outer shell 1 together; screw the pin 10 into the anti-drop groove 23 from the pin threaded hole 112 at the lower end of the side wall of the shell 11.

[0141] In step 1, the gyro-shaped fixing member 92 is inserted along the oblong hole of the rib plate 14 of the outer shell 1, so that it abuts against the fixing groove of the upper clamping plate 12 on the hot end of the outer shell 1. Then, the lower clamping plate set screw 6 is pre-tightened, so that the upper clamping plate 12 and the upper clamping plate 4 on the hot end clamp one end of the gyro-shaped fixing member 92. The clamping seat set screw 7 is then pre-tightened, so that the clamping seat 3 and the bending slider 2 clamp the other end of the gyro-shaped fixing member 92. At this time, the lower end face of the bending slider 2 is flush with the lower end face of the outer shell 1. The gyro-shaped fixing member 92 is held between the clamping seat 3 and the bending die groove 21 of the bending slider 2, and between the lower clamping plate 4 and the upper clamping plate 12 on the hot end. Figure 5 As shown in -A);

[0142] Next, the thermocouple wire 91 is introduced along the oblong hole of the outer shell rib plate 14 and passes through the thermocouple wire fixing member 92 until it rests on the thermocouple wire positioning key 8. At this time, the distance from the right end face of the thermocouple wire positioning key 8 to the end face of the clamping groove of the fixing member of the upper clamping plate 12 of the hot end (the sum of the width of the coaxial semi-circular groove opened in the upper clamping plate 12 of the hot end and the thickness of one side of the thermocouple wire positioning keyway 131 opened in the lower clamping plate stop 13) is the required length of the thermocouple wire 91 extending out of the thermocouple wire fixing member 92. Figure 5 As shown in -B).

[0143] In step 2, the pre-tightened bending slider set screw 5 is used to press the bending slider 2 downwards along the square cavity of the outer shell 1. The distance (Y) of the bending slider 2 extending out of the outer shell 1 is observed and measured to determine the bending dimension. Figure 5 As shown in -B).

[0144] During the bending process, the contact points between the fixing component 92 and the hot end lower clamping plate 4 and the bending slider 2 are smooth guide surfaces, which will not cause sharp corner marks on the outer wall of the fixing component 92.

[0145] In step 3, loosen the bending slider set screw 5, the lower clamp set screw 6, the clamp set screw 7 and the bending bolt 81, and pull the bent thermocouple wire 91 and the fixing piece 92 out of the outer shell 1 together to complete the S-shaped bend.

[0146] When performing the bending operation of thermocouple wires and thermocouple wire fixing parts in the handheld nuclear power steam generator according to the present invention, multiple processes such as positioning, clamping and bending of thermocouple wire 91 and thermocouple wire fixing parts 92 can be completed by a single person. Due to the presence of smooth guides during bending, the defects of sharp corner deformation and damage to the internal thermal sensing wire of thermocouple wire 91 after bending of thermocouple wire fixing parts 92 are avoided. The operation is simple, and the probability that the thermocouple wire fixing parts 92 will not produce sharp corners, indentations or damage after bending is as high as 100%. The thermocouple wire 91 and thermocouple wire fixing parts 92 are bent into an S-shape with high precision.

[0147] Example

[0148] The present invention is further described below through specific examples; however, these examples are merely exemplary and do not constitute any limitation on the scope of protection of the present invention.

[0149] Example 1

[0150] Operating space: a nuclear power plant steam generator steam outlet pipe box with a diameter of 800 mm;

[0151] Operating Requirements: A thermocouple welding orifice plate 18 is installed at the end of the steam outlet tube sheet. 128 pre-arranged hot-end thermocouples 9 need to be welded (forming weld points 20) onto the orifice plate, consisting of S-shaped bent thermocouple wires 91 (3.2mm in diameter) and wire fixing members 92 (6mm outer diameter, 3.3mm inner diameter, and 20mm length). Each thermocouple wire 91 is installed in its corresponding position on the orifice plate as required, and the hot end 30 of the thermocouple wire 91 (the portion of the thermocouple wire 91 extending beyond the wire fixing member 92) is aligned with the tube hole 19. Figure 1 As shown.

[0152] The bending requirements are as follows: After bending, the thermocouple wire 91 and the thermocouple wire fixing component 92 should extend 5±0.5mm beyond the thermocouple wire fixing component 92. The height difference between the axes of the thermocouple wire 91 and the thermocouple wire fixing component 92 should be 4±1mm. Furthermore, the outer wall of the thermocouple wire fixing component 92 should be smooth and free of sharp edges. Wrinkles and pits deeper than 0.1mm are not allowed on the outer surface of the thermocouple wire 91. Figure 14 As shown.

[0153] Other requirements: The installation and testing cycle for thermocouple wire 91 is 14 days, with testing taking approximately 4 days. Therefore, the installation cycle for thermocouple wire 91 is 10 days, requiring the installation of at least 13 thermocouple wires per day. The installation time for each thermocouple wire should be controlled to approximately 1 hour, and the bending time should be approximately 10 minutes.

[0154] Adopting such Figure 1 The device shown is bent according to the following steps:

[0155] Place the hot end lower clamping plate 4 into the square cavity of the outer shell 1 and fit it with the lower clamping plate block 13. Place the clamping seat 3 into the bent slider 2 and send it into the outer shell 1 together. Screw the pin 10 into the anti-drop groove 23 from the side of the outer shell 1.

[0156] Insert the fastener 92 into the oblong hole of the stiffener 14, into the fastener groove of the upper clamping plate 12 on the hot end, and observe to ensure a proper fit. Then, pre-tighten the lower clamping plate screw 6 so that the upper clamping plate 12 and the upper clamping plate 4 on the hot end clamp one end of the dipole fastener 92. Pre-tighten the clamping seat screw 7 so that the clamping seat 3 and the bending slider 2 clamp the other end of the dipole fastener 92. The pre-tightening force should not be too large, just enough to make it secure. At this time, the lower end face of the bending slider 2 is flush with the lower end face of the outer shell 1.

[0157] The thermocouple wire 91 is introduced along the oblong hole of the outer shell stiffener 14 and passes through the fixing member 92 until it is on the thermocouple wire positioning key 8. At this time, the length X of the thermocouple wire 91 extending out of the thermocouple wire fixing member 92 is 5mm.

[0158] Then, with one hand, ensure that the dipole wire 91 does not move, and with the other hand, pre-tighten the bending slider set screw 5 so that it pushes the bending slider 2 downward along the square cavity of the outer shell 1. Observe and measure the distance Y from the bending slider 2 extending out of the outer shell 1, where Y is 4.5~5mm.

[0159] Loosen the slider set screw 5, lower clamp set screw 6, clamp seat set screw 7 and bending bolt 81, and pull the bent thermocouple wire 91 and the fixing part 92 out of the outer shell 1 together to complete the S-shaped bend.

[0160] Measurements showed that after bending, the thermocouple wire 91 extended 5mm beyond the thermocouple wire fixing piece 92, and the height difference of the axis of the thermocouple wire 91 after bending was 4.2-4.5mm. The bending was completed in one step, and each bending took about 2-3 minutes. The installation of all thermocouple wires 91 took 9 days, which was completed one day ahead of schedule, and all the test data obtained from the bending were qualified.

[0161] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this invention, and are only for the convenience of describing this invention and simplifying the description, 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0162] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0163] The present invention has been described in detail above with reference to preferred embodiments and exemplary examples. However, it should be noted that these specific embodiments are merely illustrative explanations of the invention and do not constitute any limitation on the scope of protection of the invention. Various improvements, equivalent substitutions, or modifications can be made to the technical content and embodiments of the present invention without departing from the spirit and scope of protection of the invention, and all such modifications fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A handheld bending device for thermocouple wires and thermocouple wire fixing components in a nuclear power steam generator, characterized in that, The bending device includes a shell (1), a bending slider (2), a clamp (3) and a hot end lower clamp (4). The shell (1) includes a shell (11), a hot end upper clamp (12), a lower clamp block (13) and a stiffener (14). The shell (11), the hot end upper clamp (12), the lower clamp block (13) and the stiffener (14) are fixedly connected to form a square cavity for the bending slider (2), the clamp (3) and the hot end lower clamp (4) to slide. The upper clamping plate of the hot end is a solid cuboid structure. Its bottom is provided with a clamping groove for the thermocouple fixing part with the same outer diameter as the thermocouple fixing part and a coaxial semi-circular groove for the thermocouple wire to pass through. The lower clamping plate stop is L-shaped. One side of the stop is provided with a threaded hole for the lower clamping plate set screw to be screwed in, and the other side is machined with a thermocouple positioning keyway. The stiffener is a plate-shaped structure with a hole. The width of the hole is greater than the outer diameter of the thermocouple fixing component, and the height is greater than the distance between the top and bottom ends of the thermocouple after it passes through the thermocouple fixing component to achieve an S-shaped bend. The hole is an oblong hole. Before bending the thermocouple and the thermocouple fixing component, the clamp is placed in the square hole of the bending slider. The thermocouple fixing component is clamped and fixed between the clamp and the bending die groove of the bending slider. The clamp set screw is screwed into the clamp set screw thread hole and pressed against the bottom of the clamp until the thermocouple fixing component is clamped. Another part of the thermocouple fixing component is clamped and fixed between the lower clamp plate and the upper clamp plate of the hot end. The lower clamp plate set screw is screwed into the threaded hole of the lower clamp plate set screw, and the bottom of the lower clamp plate of the hot end is pressed to clamp the thermocouple fixing component. The top surface of the housing (11) is provided with a bending bolt threaded hole (111) for the bending slider set screw (5) to be screwed into. The bending slider set screw (5) is screwed into the bending bolt threaded hole (111) and pressed down to realize the S-shaped bending of the thermocouple wire (91) and the thermocouple fixing component (92) together.

2. The apparatus according to claim 1, characterized in that, The bending slider (2) has a clamping groove (22) at its center and a bending mold slot (21) at the top of the clamping groove (22). The clamping groove (22) can accommodate a clamping seat (3). The clamping seat (3) has a groove with the same shape as the bending mold slot (21). Thermocouple wire (91) and thermocouple wire fixing piece (92) are clamped between the bending mold slot (21) and the groove of the clamping seat (3).

3. The apparatus according to claim 2, characterized in that, The bending die slot (21) has a bending arc in the position where it contacts the dotted line fixing member (92) and is to be bent.

4. The apparatus according to claim 3, characterized in that, The hot end lower clamping plate (4) is attached to the lower clamping plate block (13) of the outer shell (1), and it is provided with the same bending arc as the bending mold slot (21) to achieve smooth guidance.

5. A method for bending thermocouple wires and thermocouple wire fixing components in a nuclear power steam generator, characterized in that, The method utilizes the handheld nuclear power steam generator thermocouple wire and thermocouple wire fixing component bending device as described in any one of claims 1 to 4, the method comprising: Step 1: Fix both ends of the thermocouple fixing member (92) and pass the thermocouple wire (91) through the thermocouple fixing member (92). Step 2, press down to bend the slider screw (5); Step 3: Pull out the S-shaped bent thermocouple wire (91) and thermocouple wire fixing piece (92) together through the waist-shaped hole of the stiffener plate (14) of the outer shell (1).

6. The method according to claim 5, characterized in that, In step 2, the bending slider set screw (5) is pre-tightened so that it presses the bending slider (2) downward along the square cavity of the outer shell (1), and the bending size is determined by measuring the distance of the bending slider (2) extending out of the outer shell (1).

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