A ceramic insulated thin-walled zirconium alloy target device

Abstract

The utility model provides a kind of ceramic insulating thin-walled zirconium alloy target device, copper nut is connected direct current wire is set in reproduction passage, and direct current wire is communicated to target bottle tube, target bottle tube is placed in target box, target box is placed in trolley assembly, trolley assembly is positioned in the inner wall of production passage by connecting pin, direct current wire is used to heat each component, each component is coated with ceramic insulating layer, realize the electric isolation of each component, and the thickness of production passage, trolley assembly, target bottle tube and target box is all the thin wall of- millimeter, and temperature measuring point is set to each component to detect the temperature of each component;Using the above technical scheme, each component is independently set to facilitate assembly;Direct current wire is connected with target material through each component, and each component is coated with ceramic insulating layer, so that production passage, trolley assembly, target box and target bottle tube are respectively direct current resistance heating, temperature rises fast and temperature field is uniform.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment for nuclear energy materials, specifically to a ceramic insulating thin-walled zirconium alloy target device. Background Technology

[0002] Thermo-hydraulic coupling experiments on cladding targets can obtain detailed core data on the cladding, including temperature field, critical heat flux density, heat transfer coefficient, gap thermal conductivity, and deformation. This data is of irreplaceable value for validating and improving nuclear fuel performance analysis procedures, assessing reactor thermal safety margins (especially DNBRs), optimizing fuel design, understanding the behavior of cladding materials under service conditions, and ensuring safe reactor operation.

[0003] Reactor cladding materials (such as Zr-4) have high corrosion resistance, but low thermal conductivity, high strength, and good electrical conductivity. In thermo-hydraulic coupling experiments on clad targets, it is often necessary to use direct current heating for the target and its internal components while simultaneously performing multi-point temperature measurements. Existing target designs generally employ a thick-walled cladding with externally wound resistance wires, which presents the following problems: ① High thermal inertia and low heating rate; ② Complex assembly due to multiple layers of externally wound resistance wires; ③ Difficult assembly. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a ceramic insulating thin-walled zirconium alloy target device, which aims to solve the problems of slow heating rate, uneven temperature field, and complex assembly.

[0005] This utility model provides a ceramic-insulated thin-walled zirconium alloy target device, including a production channel. Copper nuts for connecting DC wires are fixedly connected to the outer walls at both ends of the production channel. Several wire holes for temperature measurement are opened on the outer wall of the production channel. A trolley assembly for positioning the target is set inside the production channel. A sealing assembly is provided on the outer sleeve of the target and is set inside the trolley assembly. The surfaces of the production channel, the trolley assembly, and the sealing assembly are all coated with a ceramic insulating layer. The DC wires pass through the production channel, the trolley assembly, and the sealing assembly and are connected to the target.

[0006] Preferably, the production channel is tubular, with end caps movably installed at both ends. The inner and outer walls of the production channel, as well as the inner wall of the wire hole, are coated with a ceramic insulating layer, and the wall thickness of the production channel is 1-3 mm.

[0007] Preferably, the trolley assembly includes a column, with connecting ears on both the top and bottom walls of the column. A limiting ear is fixedly connected to the end cap near the connecting ear. The limiting ear and the connecting ear are connected by a connecting pin. Both ends of the connecting pin are connected to Cu terminals. The Cu terminals abut against the inner wall of the production channel. The abutment between the inner wall of the production channel and the Cu terminals is a notch in the ceramic insulating layer. A sealing assembly is disposed inside the column, and a side groove is provided on the side of the column for installing the sealing assembly.

[0008] Preferably, the sealing assembly includes a target tube, a target material is placed inside the target tube, the top end of the target tube has an opening for a DC wire to extend out, a sealing plug is provided at the opening, the target tube is located inside the vehicle pillar, and the DC wire extends out from a side groove opened in the vehicle pillar.

[0009] The sealing assembly also includes a target box, which is sealed at both ends by end plugs. The end plugs have an air inlet and an air outlet, which are connected to the outside through air guide tubes. The end plugs also have a helium filling hole for filling the target box with helium. The target tube is located inside the target box and is sealed by the end plugs. The end plugs also have a wire outlet for extending the DC wire at the top of the target tube to the outside. The target box is placed inside the vehicle pillar.

[0010] Preferably, the outer surface of the target box is coated with a ceramic insulating layer; the inner and outer walls of the trolley assembly are both coated with a ceramic insulating layer.

[0011] Preferably, the inner walls of the target bottle tube, target box, column and production channel are provided with temperature measuring points for detecting the internal temperature, and the outer wall of the target material is provided with temperature measuring points, with the wires of the temperature measuring points leading out from the wire holes.

[0012] Compared with existing technologies, it has the following beneficial effects: This invention provides a ceramic-insulated thin-walled zirconium alloy target device. A copper nut is used to connect a DC wire through a reprocessing channel, which then connects to the target tube. The target tube is placed inside a target box, which is placed inside a trolley assembly. The trolley assembly is positioned against the inner wall of the production channel via connecting pins. The DC wire is used to heat each component, and each component is coated with a ceramic insulating layer to achieve electrical isolation. The production channel, trolley assembly, target tube, and target box all have a wall thickness of -mm. Temperature measuring points are set for each component to detect its temperature. Using this technical solution, each component is independently configured for easy assembly. The DC wire connects to the target material through each component, and each component is coated with a ceramic insulating layer, allowing the production channel, trolley assembly, target box, and target tube to be heated by DC resistance, resulting in rapid heating and a uniform temperature field. Attached Figure Description

[0013] 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 preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a ceramic insulating thin-walled zirconium alloy target device according to the present invention; Figure 2 This is an exploded view of a ceramic insulating thin-walled zirconium alloy target device according to this utility model; Figure 3 This is a schematic diagram of the trolley assembly of this utility model; Figure 4 This is a schematic diagram of the target box of this utility model; Figure 5 This is a schematic diagram of the target bottle tube of this utility model; Figure 6 This is a schematic diagram showing the location of the ceramic insulating layer of this utility model; Figure 7 This is a schematic diagram showing the location of the temperature measuring point in this utility model.

[0015] In the diagram, 1-production channel; 11-DC wire; 12-copper nut; 13-wire hole; 14-end cap; 141-limiting ear; 2-target material; 3-carriage assembly; 31-carriage column; 32-side groove; 33-connecting ear; 34-connecting pin; 35-Cu terminal; 4-sealing assembly; 41-target bottle tube; 411-opening; 412-sealing plug; 42-target box; 421-end plug; 422-air inlet; 423-air outlet; 424-helium filling hole; 425-wire protrusion; 5-ceramic insulation layer; 6-temperature measuring point. Detailed Implementation

[0016] To better understand the structure, functional features, and advantages of this utility model, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings: Example: like Figures 1 to 7As shown, this utility model provides a ceramic-insulated thin-walled zirconium alloy target device, including a production channel 1. Copper nuts 12 for connecting DC wires 11 are fixedly connected to the outer walls of both ends of the production channel 1. Several wire holes 13 for temperature measurement are opened on the outer wall of the production channel 1. A trolley assembly 3 for positioning a target material 2 is arranged inside the production channel 1. A sealing assembly 4 is fitted over the target material 2 and is disposed inside the trolley assembly 3. The production channel 1, the trolley assembly 3, and the sealing assembly 4 are all coated with a ceramic insulating layer 5. The DC wires 11 pass through the production channel 1, the trolley assembly 3, and the sealing assembly 4 respectively and are connected to the target material 2. The production channel 1 is tubular, with end caps 14 movably installed at both ends. The inner and outer walls of the production channel 1, as well as the inner walls of the wire holes 13, are coated with a ceramic insulating layer 5. The wall thickness of the production channel 1 is 1-3 mm. A series collar for connecting multiple production channels 1 in series is movably fitted outside the production channel 1.

[0017] The production channel 1 has a wall thickness of 1-3 mm, which is thinner than traditional production channels 1, resulting in a faster heating rate. The wall thicknesses of other components, such as the carriage assembly 3 and the sealing assembly 4, are also 1-3 mm. The production channel 1, carriage assembly 3, and sealing assembly 4 are all made of Zr-4, a commonly used zirconium alloy experimental material in this field. Specifically, the production channel 1 in this application has an outer diameter of 34 mm, a wall thickness of 2 mm, and a height of 80 mm. Different models of production channels 1 can be used in actual experiments; the values ​​provided above represent the commonly used models in this application's experiments. The copper nut 12 on production channel 1 is used to connect the DC wire 11, which extends into the sealing assembly 4. Production channel 1, trolley assembly 3, and sealing assembly 4 are all coated with a ceramic insulating layer 5 using atmospheric plasma spraying. Before spraying, the surfaces of components such as production channel 1 are vacuum degreased and subjected to a two-hour heat treatment at 1100 degrees Celsius. After spraying, a helium leak test is performed at 1.5 times the design pressure. The thickness of the ceramic insulating layer 5 is 50-80µm. In this application, the ceramic insulating layer 5 of production channel 1 has a wall thickness of 60µm, and the ceramic insulating layer 5 of trolley assembly 3 has a wall thickness of 70µm. The black squares in the attached drawings represent layers.

[0018] The temperature-measuring wire is encapsulated with water-resistant high-temperature sealant and passes through the wire hole 13 of the production channel 1. Multiple wire holes 13 can be provided depending on the actual situation; this application provides 48. The end cap 14 is used to seal the production channel 1. When multiple production channels need to be connected in series in the experiment, a collar with both ends in a ring shape, connected by a solid rod, can be used to connect two or more production channels 1 in series. This collar is made of insulating material, such as rubber.

[0019] As another embodiment, such as Figure 2 and Figure 3As shown, the trolley assembly 3 of this application includes a column 31. The top and bottom walls of the column 31 are provided with connecting ears 33. The end cap 14 is fixedly connected to a limiting ear 141 near the connecting ear 33. The limiting ear 141 and the connecting ear 33 are connected by a connecting pin 34. The two ends of the connecting pin 34 are connected to Cu terminals 35. The Cu terminals 35 abut against the inner wall of the production channel 1. The abutment between the inner wall of the production channel 1 and the Cu terminals 35 is a notch in the ceramic insulating layer 5. The sealing assembly 4 is disposed inside the column 31. A side groove 32 is provided on the side of the column 31 for installing the sealing assembly 4.

[0020] The column 31 is columnar, adapted to the shape of the production channel 1. Side grooves 32 are formed on the side walls of the column 31 to facilitate the insertion of the sealing assembly 4 into the column 31. Both ends of the column 31 are integrally formed top covers. Connecting ears 33 have holes for connecting pins 34. The limiting ears 141 and connecting ears 33 are staggered, with the connecting pins 34 passing through them. Both ends of the connecting pins 34 are threaded to Cu terminals 35. The Cu terminals 35 abut against the inner wall of the production channel 1. At this abutment point, the production channel 1 is not coated with the ceramic insulating layer 5, or a pin is provided on the inner wall of the production channel 1, and then the Cu terminals 35 are connected to the pin. This application uses a production channel 1 at the abutment point that is not coated with the ceramic insulating layer 5, which is more convenient during assembly.

[0021] As another embodiment, such as Figure 2 , Figure 4 and Figure 5 As shown, the sealing assembly 4 of this application includes a target tube 41, a target material 2 is placed inside the target tube 41, the top end of the target tube 41 is provided with an opening 411 for extending a DC wire 11, a sealing plug 412 is provided at the opening 411, the target tube 41 is located inside the vehicle pillar 31, and the DC wire 11 extends out from the side groove 32 opened in the vehicle pillar 31.

[0022] The sealing assembly 4 also includes a target box 42, which is sealed at both ends by end plugs 421. The end plugs 421 have an inlet 422 and an outlet 423, which are connected to the outside via gas guide tubes. The end plugs 421 also have a helium filling hole 424 for filling the target box 42 with helium. The target tube 41 is located inside the target box 42 and sealed by the end plugs 421. The end plugs 421 also have a wire extension opening 425 for extending the DC wire 11 at the top of the target tube 41 to the outside. The target box 42 is placed inside the vehicle pillar 31. The outer surface of the target box 42 is coated with a ceramic insulating layer 5; both the inner and outer walls of the vehicle assembly 3 are coated with a ceramic insulating layer 5.

[0023] During the experiment, target material 2 is placed inside target bottle tube 41. The end of DC wire 11 is connected to target material 2, extending from opening 411 to the outside of target bottle tube 41, and passing through the center of sealing plug 412. Target box 42 is tubular, sealed at both ends by end plugs 421 made of rubber. Helium is required to fill target box 42 during the experiment, and after the experiment, the helium is discharged through gas guides connected to inlet 422 and outlet 423. Filling target box 42 with helium during the experiment increases the internal thermal conductivity of target box 42, improves the sensitivity of temperature changes in temperature measurement, and protects Zr-4 material, inhibiting oxide layer growth. Furthermore, helium is an inert gas with a very small absorption cross-section for neutrons, preventing gas activation and interference with radioactivity. Target box 42 is inserted into vehicle column 31 through side groove 32.

[0024] As another embodiment, such as Figure 6 and Figure 7 Temperature measuring points 6 for detecting internal temperature are provided on the inner walls of the target bottle tube 41, target box 42, column 31 and production channel 1. Temperature measuring points 6 are provided on the outer wall of the target material 2. The wires of the temperature measuring points 6 are led out from the wire hole 13.

[0025] Temperature measuring points 6 are used to measure the temperature of each component. After drilling, the wire holes 13 undergo secondary ceramic spraying to ensure hole wall insulation. This application includes 48 temperature measuring points 6, located at the radial center of the target material 2, the intersection of the inner diameter of the target tube 41 and the surface of the target material 2, the intersection of the inner diameter of the target box 42 and the surface of the target tube 41, the intersection of the target box 42 and the surface of the carriage column 31, and the outer wall of the production channel 1. The temperature measuring points 6 are needle-type resistance thermometers, connected to the wire holes 13 on the production channel 1 via temperature measuring wires. In the attached diagram, to avoid excessive lines for each component and for ease of observation, the wire holes 13 of the carriage assembly 3 and the sealing assembly 4 are not shown. In actual use, the wire holes 13 of the carriage assembly 3 and the sealing assembly 4 correspond to the wire holes 13 of the production channel 1.

[0026] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A ceramic insulating thin-walled zirconium alloy target device, characterized by The production channel (1) includes a production channel (1), and copper nuts (12) for connecting DC wires (11) are fixedly connected to the outer walls of both ends of the production channel (1). Several wire holes (13) for temperature measurement are opened on the outer wall of the production channel (1). A trolley assembly (3) for positioning the target material (2) is provided inside the production channel (1). A sealing assembly (4) is provided on the outer sleeve of the target material (2). The sealing assembly (4) is located inside the trolley assembly (3). The surfaces of the production channel (1), the trolley assembly (3) and the sealing assembly (4) are all coated with a ceramic insulating layer (5). The DC wires (11) pass through the production channel (1), the trolley assembly (3) and the sealing assembly (4) respectively and are connected to the target material (2).

2. The ceramic insulating thin walled zirconium alloy target device of claim 1, wherein, The production channel (1) is tubular, and end caps (14) are movably provided at both ends of the production channel (1). The inner and outer walls of the production channel (1) and the inner wall of the wire hole (13) are coated with the ceramic insulating layer (5). The wall thickness of the production channel (1) is 1-3 mm.

3. The ceramic insulating thin-walled zirconium alloy target device according to claim 2, characterized in that, The trolley assembly (3) includes a column (31), and the top and bottom walls of the column (31) are provided with connecting ears (33). The end cap (14) is fixedly connected to a limiting ear (141) on the side near the connecting ear (33). The limiting ear (141) and the connecting ear (33) are connected by a connecting pin (34). The two ends of the connecting pin (34) are connected to Cu terminals (35). The Cu terminals (35) abut against the inner wall of the production channel (1). The abutment between the inner wall of the production channel (1) and the Cu terminals (35) is a notch in the ceramic insulating layer (5). The sealing assembly (4) is disposed inside the column (31). A side groove (32) is provided on the side of the column (31) for installing the sealing assembly (4).

4. The ceramic insulating thin walled zirconium alloy target device of claim 3, wherein, The sealing assembly (4) includes a target tube (41), the target material (2) is placed inside the target tube (41), the top end of the target tube (41) is provided with an opening (411) for the DC wire (11) to extend out, a sealing plug (412) is provided at the opening (411), the target tube (41) is located inside the vehicle pillar (31), and the DC wire (11) extends out from the side groove (32) opened in the vehicle pillar (31).

5. The ceramic insulating thin-walled zirconium alloy target device according to claim 4, characterized in that, The sealing assembly (4) also includes a target box (42), the two ends of which are sealed by end plugs (421). The end plugs (421) have an air inlet (422) and an air outlet (423). The air inlet (422) and the air outlet (423) are respectively connected to the outside through a gas guide tube. The end plugs (421) also have a helium filling hole (424) for filling the target box (42) with helium. The target bottle tube (41) is located inside the target box (42) and is sealed by the end plugs (421). The end plugs (421) also have a wire extension port (425) for extending the DC wire (11) at the top of the target bottle tube (41) to the outside. The target box (42) is placed inside the vehicle pillar (31).

6. The ceramic insulating thin walled zirconium alloy target device of claim 5, wherein, The outer surface of the target box (42) is coated with the ceramic insulating layer (5); the inner and outer walls of the trolley assembly (3) are coated with the ceramic insulating layer (5).

7. The ceramic insulating thin walled zirconium alloy target device of claim 5, wherein, The inner walls of the target tube (41), the target box (42), the vehicle column (31) and the production channel (1) are all provided with temperature measuring points (6) for detecting the internal temperature. The outer wall of the target material (2) is provided with the temperature measuring points (6). The wires of the temperature measuring points (6) are led out from the wire hole (13).

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