Silicon carbide composite connection device

Abstract

The present invention relates to a silicon carbide composite material connection device for connecting a cladding tube and two end plugs. The cladding tube is provided with mounting holes at opposite ends along its axial direction, and each mounting hole is used to install an end plug. The silicon carbide composite material connection device comprises: a device body, the device body having a first accommodating chamber, the first accommodating chamber being used to accommodate gas with a preset pressure, and the cladding tube and one of the end plugs connected to the cladding tube being able to extend into the first accommodating chamber; and a heating structure, the heating structure being provided on the device body and being used to heat the connection between the cladding tube and the end plug. The above-mentioned silicon carbide composite material connection device, by filling the first accommodating chamber with gas with a preset pressure and heating the connection between the cladding tube and the end plug extending into the first accommodating chamber, causes the connection material to solidify under the gas atmosphere and heating conditions and form a connection layer, thereby achieving the connection between the cladding tube and the end plug made of silicon carbide composite material.

Description

Technical Field

[0001] The present invention relates to the field of nuclear fuel technology, in particular to a silicon carbide composite material connecting device. Background Art

[0002] Nuclear power safety has always been a focus of widespread concern internationally. In order to improve and upgrade the existing zirconium alloy / uranium dioxide fuel system, silicon carbide composite materials with the advantages of high high-temperature strength, strong oxidation resistance, good thermal stability, low density, wear resistance, corrosion resistance, and small neutron absorption cross-section are considered to be the best alternative material. They can be used to make cladding tubes for loading fuel and their connecting and sealing end plugs.

[0003] However, since silicon carbide (SiC) is an inorganic non-metallic ceramic material, SiC ceramic material is very brittle and hard, and the connection and packaging of the cladding tube and end plug made of silicon carbide composite material has become a bottleneck limiting its application. Summary of the Invention

[0004] Based on this, it is necessary to provide a silicon carbide composite material connecting device that can be used to connect the cladding tube and the end plug made of silicon carbide composite material to solve the problem that the cladding tube and the end plug made of silicon carbide composite material are difficult to connect and package.

[0005] According to one aspect of the present application, a silicon carbide composite material connection device is provided for connecting a cladding tube and two end plugs, wherein the cladding tube is provided with mounting holes at opposite ends along its axis, each of the mounting holes being used to mount an end plug, and the silicon carbide composite material connection device comprises:

[0006] a device body, the device body having a first accommodating cavity, the first accommodating cavity being used to accommodate gas having a preset pressure, and the cladding tube and one of the end plugs connected to the cladding tube being able to extend into the first accommodating cavity; and

[0007] A heating structure is provided on the device body and is used to heat the connection between the cladding tube and the end plug.

[0008] In one embodiment, the heating structure is configured to heat the connection between the cladding tube and the end plug in a non-contact manner.

[0009] In one embodiment, the heating structure heats the connection between the cladding tube and the end plug by induction heating; the heating structure includes a heating source and a heating element;

[0010] The heating source is provided in the device body and is located outside the first accommodating cavity;

[0011] The heating element is mounted on the device body and is sleeved at intervals along the circumferential direction of the cladding tube at the connection between the cladding tube and the end plug located in the first accommodating cavity;

[0012] The heating source is used for inductively heating the heating element, and the heating element can radiate heat to heat the connection between the cladding tube and the end plug.

[0013] In one embodiment, the heating structure heats the connection between the cladding tube and the end plug by means of a laser or an electron beam.

[0014] In one embodiment, the silicon carbide composite material connection device further includes a fluid source;

[0015] The fluid source is connected to the first accommodating chamber, and the fluid source is used to input gas into the first accommodating chamber.

[0016] In one embodiment, the device body further comprises a second accommodating cavity, and the silicon carbide composite material connecting device further comprises a heat insulating member, a mounting device and a positioning sleeve;

[0017] The first accommodating cavity and the second accommodating cavity are separated from each other by the thermal insulation member, and the thermal insulation member is provided with an opening for the cladding tube to pass through;

[0018] The mounting device is mounted on the device body and is located in the second accommodating cavity;

[0019] The positioning sleeve is installed on the installation device and is located in the second accommodating cavity; the positioning sleeve is provided with a positioning hole along its axial direction, and the positioning sleeve fixes the cladding tube by means of the positioning hole.

[0020] In one embodiment, the positioning sleeve is provided with a plurality of positioning holes spaced apart along one side of the axial direction thereof;

[0021] Each of the positioning holes can be used to position a cladding tube.

[0022] In one embodiment, all of the positioning holes pass through the positioning sleeve along the axial direction of the positioning sleeve.

[0023] In one embodiment, the silicon carbide composite material connection device further includes a first viewing window;

[0024] The first viewing window is provided on the device body at a position corresponding to the second accommodating cavity, and is used for observing the situation in the second accommodating cavity.

[0025] In one embodiment, the silicon carbide composite material connection device further includes a cooling pipe;

[0026] The cooling pipe is mounted on the device body and is located on a side of the device body away from the first accommodating cavity along the axial direction of the cooling pipe, and a cooling channel is formed along the axial direction of the cooling pipe and passes through the cooling pipe, and the cooling channel can be used to accommodate the cladding tube and the end plug and cool the cladding tube and the end plug;

[0027] Wherein, the axial direction of the cooling tube is parallel to the axial direction of the cladding tube.

[0028] In one embodiment, the silicon carbide composite material connection device further includes a brake member;

[0029] The brake member is movably mounted on the device body along the axial direction of the cladding tube and is located on a side of the cladding tube away from the cooling tube, and one end of the brake member close to the cladding tube is located in the first accommodating cavity;

[0030] The braking member can respond to an external force to push the end plug and the cladding tube to move along the axis of the cladding tube toward the cooling tube to the cooling channel.

[0031] In one embodiment, the silicon carbide composite material connection device further includes a temperature measuring component;

[0032] The temperature measuring element is used to measure the temperature in the first accommodating cavity.

[0033] The above-mentioned silicon carbide composite material connection device is configured to connect the cladding tube and the end plug made of silicon carbide composite material by filling the first accommodating chamber with gas of preset pressure and heating the connection between the cladding tube and the end plug extending into the first accommodating chamber, so that the connection material is solidified under the gas atmosphere and heating conditions to form a connection layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 1 is a schematic front view of a silicon carbide composite material connecting device in one embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the positioning sleeve, cladding tube, end plug and heating element in one embodiment of the present invention;

[0036] Figure 3 Schematic diagram of the flow of an air intake supercharging device in one embodiment of the present invention;

[0037] Figure 4 Schematic diagram of the left side of a silicon carbide composite material connection device in one embodiment of the present invention.

[0038] Description of Figure Numbers:

[0039] 100. Silicon carbide composite material connection device; 110. Device body; 111. First accommodating chamber; 112. Second accommodating chamber; 121. Heater; 1211. Mounting through-hole; 130. Positioning sleeve; 131. Positioning hole; 140. Cooling pipe; 141. Cooling channel; 151. Mounting device; 152. Braking member; 153. First viewing window; 154. Second viewing window; 155. First flange; 156. Second flange; 157. Sealing plug; 160. Intake booster device; 170. Pressurizing device;

[0040] 210, cladding tube; 211, mounting hole; 220, end plug; DETAILED DESCRIPTION

[0041] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial direction", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0047] Following the Fukushima nuclear accident in Japan, nuclear power safety has once again become a focus of widespread international attention. Improving nuclear power safety, particularly raising the safety threshold for nuclear reactors to withstand beyond-design-basis nuclear accidents, has become a crucial issue for the sustainable development of nuclear energy. Accident-tolerant fuel (ATF), a new nuclear safety technology, emerged within this context and has gradually become one of the most important research topics in the global nuclear power industry. Its goal is to improve, upgrade, or even completely replace the existing zirconium alloy / uranium dioxide fuel system. This approach aims to reduce the enthalpy of reaction between the cladding and high-temperature steam and the amount of hydrogen generated, improve the cladding's structural integrity and functionality at 1600°C accident temperatures, and enhance the cladding's ability to confine fission gases. To this end, silicon carbide composites, with their multiple advantages, are considered a promising alternative material for the fuel-carrying cladding tubes and their connecting and sealing end plugs. In theory, cladding tubes and end plugs made of silicon carbide composites offer excellent accident tolerance and can significantly improve nuclear power safety, preventing the leakage and spread of radioactive nuclear material. However, the connection and packaging of the cladding tube and the end plug made of silicon carbide composite material has not been solved yet.

[0048] To this end, the present application provides a silicon carbide composite material connection device to solve the above-mentioned problems.

[0049] Figure 1 A front schematic diagram of a silicon carbide composite material connecting device in one embodiment of the present invention is shown.

[0050] See Figure 1 The cladding tube 210 is provided with mounting holes 211 at opposite ends along its axial direction, and the two end plugs 220 are connected to the cladding tube 210 respectively by means of the two mounting holes 211. That is, before connection, the end plugs 220 need to be inserted into the mounting holes 211, and connecting materials need to be placed in the gap between the end plugs 220 and the cladding tube 210 (the connecting materials are not specifically limited here, and can be used to connect end plugs and cladding tubes made of silicon carbide composite materials). Then, the installed cladding tube 210 and end plugs 220 are placed together in the silicon carbide composite material connection device 100 for connection and packaging.

[0051] Specifically, the present application provides a silicon carbide composite material connection device 100, including a device body 110 and a heating structure. The device body 110 has a first accommodating cavity 111, and the first accommodating cavity 111 contains gas with a preset pressure. The installed cladding tube 210 and one of the end plugs 220 can be extended into the first accommodating cavity 111. The heating structure is turned on to heat the connection between the cladding tube 210 and the end plug 220 extended into the first accommodating cavity 111 under a preset pressure to perform connection and packaging.

[0052] In this way, by filling the first accommodating chamber 111 with gas of a preset pressure and heating the connection between the cladding tube 210 and the end plug 220 extending into the first accommodating chamber 111, the connecting material is solidified under the gas atmosphere and heating conditions to form a connecting layer, thereby realizing the connection between the cladding tube 210 and the end plug 220 made of silicon carbide composite material.

[0053] See Figure 1 The device body 110 has a first accommodating chamber 111 for accommodating gas at a preset pressure. The cladding tube 110 and one of the end plugs 220 connected to the cladding tube 110 can extend into the first accommodating chamber 111 to connect the cladding tube 110 and the end plug 220. The preset pressure can be adjusted as needed; the gas is an inert gas, such as nitrogen or argon. Preferably, the gas is argon.

[0054] It should be noted that, in the present application, since only the cladding tube 210 and one of the end plugs 220 connected to the cladding tube 110 are extended into the first accommodating cavity 111, and each cladding tube 210 is connected to end plugs 220 at both opposite ends along its axial direction, after the cladding tube 210 and one of the end plugs 220 are connected, the cladding tube 210 and the end plug 220 need to be taken out, and then the cladding tube 210 and the other end plug 220 need to be extended into the first accommodating cavity 111 to connect the cladding tube 210 and the other end plug 220.

[0055] Figure 2 A schematic structural diagram of a positioning sleeve, a cladding tube, an end plug and a heating element in an embodiment of the present invention is shown.

[0056] See Figure 1 and Figure 2 The heating structure is provided on the device body 110 for heating the connection between the cladding tube 210 and the end plug 220, and the heating structure is configured to heat the connection between the cladding tube 210 and the end plug 220 in a non-contact manner.

[0057] In some embodiments, the heating structure heats the connection between the cladding tube 210 and the end plug 220 by induction heating. Specifically, the heating mechanism includes a heating source (not shown) and a heating element 121. The heating source is provided in the device body 110 and is located outside the first accommodating chamber 111, and is used for inductively heating the heating element 121. The heating element 121 has a cylindrical structure and has a mounting through-hole 1211 extending through the heating element 121 along its axial direction. The heating element 121 is mounted on the device body 110 and is spaced apart along the circumferential direction of the cladding tube 210 by means of the mounting through-hole 1211 at the connection between the cladding tube 210 and the end plug 220 located in the first accommodating chamber 111. That is, the aperture of the heating element 121 needs to be larger than the outer diameter of the cladding tube 210 and the end plug 220. The heating element 121 can radiate heat to heat the connection between the cladding tube 210 and the end plug 220 located in the first accommodating chamber 111. Optionally, the heating source is a water-cooled radio frequency inductor coil, and the heating element 121 is inductively heated by a high-frequency power supply (50KW); the material of the heating element 121 is graphite or tungsten.

[0058] In other embodiments, the heating structure heats the connection between the cladding tube 210 and the end plug 220 by means of a laser or an electron beam. That is, the heating structure is a laser device or an electron beam instrument (not shown in the figure), and the laser emitted by the laser device or the electron beam emitted by the electron beam instrument directly heats the connection between the cladding tube 210 and the end plug 220.

[0059] Figure 3 A schematic flow chart of an intake supercharging device in an embodiment of the present invention is shown.

[0060] The silicon carbide composite material connection device 100 further includes a fluid source, which is connected to the first accommodating cavity 111 and is used to input gas into the first accommodating cavity 111. Figure 3Specifically, in one embodiment, the fluid source includes an air intake boosting device 160, which is disposed in the device body 110 and connected to the first accommodating chamber 111. The air intake boosting device 160 is configured to boost the gas to a preset pressure and then fill the gas into the first accommodating chamber 111. The air intake boosting device 160 includes a gas source 161, an air intake valve 162, a pressure gauge 163, a gas boosting valve 164, a solenoid valve 165, a driving pressure gauge 166, a driving valve 167, a silent air compressor 168, an electrode point pressure gauge 169, a gas storage tank 182, a safety valve 183, an air outlet valve 184, a pressure regulating valve 185, and a pressure regulating pressure gauge 186. The specific gas increase process is: open the air intake valve 162, the gas boosting valve 164, the solenoid valve 165 and the drive valve 167, and the gas passes through the air intake valve 162, the gas boosting valve 164, the solenoid valve 165, the drive valve 167 and the silent air compressor 168 in sequence from the gas source 161. The silent air compressor 168 pressurizes the gas by compressing the gas. The electrode point pressure gauge 169 is used to detect whether the pressurized gas pressure is the set pressure. If the pressurized gas pressure is not equal to the set pressure, the electrode point pressure gauge 169 feeds back the pressurized gas pressure to the solenoid valve 165. The solenoid valve 165 controls the silent air compressor 168 to adjust the gas pressure. The electrode point pressure gauge 169 can repeatedly detect the gas pressure and feed back the adjusted gas pressure to the solenoid valve 165 until the gas pressure detected by the electrode point pressure gauge 169 is equal to the set pressure. When the gas pressure is equal to the set pressure, the gas is stored in the gas storage tank 182. When the safety valve 183 , the gas outlet valve 184 and the pressure regulating valve 185 are opened, the pressure of the high-pressure gas in the gas storage tank 182 is adjusted to a preset pressure through the pressure regulating valve 185 , and then the gas adjusted to the preset pressure is filled into the first accommodating chamber 111 .

[0061] Optionally, the gas storage tank 182 is made of 304 stainless steel, has a volume of 1000 ml, a designed pressure resistance of 50 MPa, and an operating pressure of 40 MPa; the pressure regulating valve 185 is used to adjust the pressurized high-pressure gas to the preset pressure required for the connection package. The pressure regulating valve 185 adopts a large-flow high-precision diaphragm regulating valve with a maximum inlet pressure of 6000 psi, an outlet pressure of 50-6000 psi, an accuracy of 0.5 MPa, and a pressure regulation accuracy of 50 psi.

[0062] It should be noted that the set pressure is the operating pressure of the gas storage tank 182, the preset pressure is the pressure required to connect the cladding tube 210 and the end plug 220, the first accommodating chamber 111 is a high-pressure chamber, which is a cylindrical structure as a whole, with a design pressure of 15 MPa and a maximum working pressure of 10 MPa, while meeting the 1×10 -1 Pa vacuum degree requirement, so the preset pressure in this application does not exceed the design pressure of the first accommodating chamber 111 of 15MPa.

[0063] See Figure 1 The silicon carbide composite material connection device 100 further includes a second accommodating cavity 112 and a thermal insulator (not shown). The first accommodating cavity 111 and the second accommodating cavity 112 are separated from each other by the thermal insulator. The thermal insulator is provided with an opening for the cladding tube 210 to pass through, allowing the first accommodating cavity 111 and the second accommodating cavity 112 to communicate with each other. The thermal insulator is used to prevent the heating temperature of the first accommodating cavity 111 and the second accommodating cavity 112 from diffusing to each other. Optionally, the thermal insulator is a thermal insulation sponge or a thermal insulation plug.

[0064] The silicon carbide composite material connection device 100 also includes a mounting device 151 and a positioning sleeve 130. The mounting device 151 is mounted on the device body 110 and positioned within the second accommodating cavity 112. Optionally, the mounting device 151 is a flange. Of course, the mounting device 151 may also have other structures that can be used to install and position the positioning sleeve 130.

[0065] The positioning sleeve 130 is a rotating body structure. The positioning sleeve 1130 is installed on the installation device 151 and is located in the second accommodating chamber 112. The positioning sleeve 130 has a positioning hole 131 along its axial direction. The positioning sleeve 130 uses the positioning hole 131 to support and limit the cladding tube 210. That is, one end of the cladding tube 210 along its axial direction can be extended into the first accommodating chamber 111, and the other end can be extended into the positioning hole 131. The positioning sleeve 130 supports the cladding tube 210 and also limits the position of the cladding tube 210. When installing the cladding tube 210, the end plug 220 is first inserted into the installation hole 211, and then the end of the cladding tube 210 with the end plug 220 is sequentially extended into the second accommodating chamber 112, the opening of the thermal insulation component, and the first accommodating chamber 111, so that the connection between the cladding tube 210 and the end plug 220 is located in the first accommodating chamber 111.

[0066] In one embodiment, the silicon carbide composite material connection device 100 can simultaneously connect multiple cladding tubes 210. Each cladding tube 210 is connected to two end plugs 220. The positioning sleeve 130 is provided with multiple positioning holes 131 spaced apart along one side of its axis. Each positioning hole 131 can accommodate one of the cladding tubes 210 to support and limit the position of the cladding tube 210. Optionally, the positioning holes 131 are blind holes.

[0067] In another embodiment, all the positioning holes 131 pass through the positioning sleeve 130 along the axial direction of the positioning sleeve 130 .

[0068] It should be noted that when the cladding tube 210 is short, the positioning hole 131 can be set as a blind hole, and when the cladding tube 210 is long, the positioning hole 131 can be set as a through hole to accommodate and install the cladding tube 210.

[0069] This is beneficial for improving the adaptability of the positioning sleeve 130 and also avoids the problem of the overall size of the silicon carbide composite material connection device 100 being too large due to the provision of a longer first accommodating cavity 111 .

[0070] Figure 4 FIG2 shows a left side schematic diagram of a silicon carbide composite material connection device in one embodiment of the present invention.

[0071] See Figure 4 , and combined with Figure 1 In one embodiment, the silicon carbide composite material connection device 100 further includes a first viewing window 153 and a sealing plug 157. The first viewing window 153 is provided on the device body 110 at a position corresponding to the second accommodating cavity 112 and is used to observe the conditions within the second accommodating cavity 112. The sealing plug 157 is mounted on the device body 110 via fasteners and is used to seal the gap between the device body 110 and the first viewing window 153. Optionally, the first viewing window 153 is made of sapphire glass, or the first viewing window 153 can also be made of other high-temperature-resistant transparent materials.

[0072] It should be noted that when the heating structure heats the connection between the cladding tube 210 and the end plug 220 by means of a laser or an electron beam, the laser or electron beam can pass through the first visible window 153 to heat the connection between the cladding tube 210 and the end plug 220 located in the second accommodating cavity 112. In other words, the present application can be provided with two heating structures, one heating structure heating the connection between the cladding tube 210 and the end plug 220 located in the first accommodating cavity 111 by induction heating, and the other heating structure heating the connection between the cladding tube 210 and the end plug 220 located in the second accommodating cavity 112 by means of a laser or an electron beam, but the two heating structures cannot heat simultaneously.

[0073] In this way, the present application can provide two heating structures to avoid the need to remove the cladding tube 210 and the end plug 220 after connecting the cladding tube 210 and one of the end plugs 220, and then insert the cladding tube 210 and the other end plug 220 into the first accommodating cavity 111 to connect the cladding tube 210 and the other end plug 220, thereby improving the connection efficiency. Figure 1In one embodiment, the silicon carbide composite material connection device 100 further includes a cooling tube 140 and a first flange 155. The cooling tube 140 is mounted on the device body 110 via the first flange 155 and is located on a side of the device body 110 away from the first accommodating cavity 111 along the axial direction of the cooling tube 140. The cooling tube 140 is provided with a cooling channel 141 extending through the cooling tube 140 along its axial direction. The cooling channel 141 can be used to accommodate the cladding tube 210 and the end plug 220 and cool the cladding tube 210 and the end plug 220. That is, after the cladding tube 210 and the end plug 220 are connected, they can be moved to the cooling channel 141 for cooling. The axial direction of the cooling tube 140 is parallel to the axial direction of the cladding tube 210. Optionally, the axis of the cooling channel 141 coincides with the axis of the positioning sleeve 130, and the aperture of the cooling channel 141 is larger than the outer diameter of the cladding tube 210 and the end plug 220.

[0074] See Figure 1 In one embodiment, the silicon carbide composite material connection device 100 further includes a brake member 152, a second flange 156, and a pressurizing device 170. The brake member 152 is movably mounted on the device body 110 along the axis of the cladding tube 210 via the second flange 156 and is located at the end of the cladding tube 210 away from the cooling tube 140. The end of the brake member 152 close to the cladding tube 210 is located within the first accommodating cavity 111. The brake member 152 can respond to external force to push the end plug 220 and the cladding tube 210 to move along the axis of the cladding tube 210 toward the cooling tube 140 to the cooling channel 141. The pressurizing device 170 is mounted on an end of the device body 110 away from the cooling tube 140. The pressurizing device 170 includes a pressurizing member, a pressure sensor, a first elastic member, and a second elastic member. The first elastic member is disposed between the pressure sensor and the brake member 152, and the second elastic member is disposed between the brake member 152 and the cladding tube 210 (which can also be understood as the end plug 220 located in the first accommodating chamber 111). The pressurizing member applies pressure to the pressure sensor and transmits the pressure to the first elastic member, the brake member 152, the second elastic member, and the cladding tube 210 in sequence through the pressure sensor. The pressurizing speed of the pressurizing member is adjustable; the brake member 152 can be a rotating structure with its axis aligned with the axis of the cladding tube 210. Alternatively, the side of the brake member 152 proximal to the cladding tube 210 can at least partially abut against the cladding tube 210, thereby pushing the cladding tube 210 into the cooling channel 141. Optionally, the pressure sensor may be a micro pressure sensor with a pressure range of 0-200N and a measurement accuracy of 0.3%; the first elastic member and the second elastic member are both springs.

[0075] Because the connection between the cladding tube 210 and the end plug 220 is hot and potentially prone to rupture, the cladding tube 210 is placed on the cooling tube 140 for cooling to ensure safety. This also ensures that the connection is not prone to rupture. The cladding tube 210 is removed after it has cooled for a period of time. By applying pressure to the brake member 152 through the pressurizing device 170, the brake member 152 pushes the cladding tube 210 toward the cooling tube 140 and into the cooling channel 141. This prevents the operator from directly removing the cladding tube 210 from the first accommodating chamber 111, effectively improving operational safety.

[0076] See Figure 4 In one embodiment, the silicon carbide composite material connection device 100 further includes a temperature measuring element, which is used to measure the temperature within the first accommodating cavity 111. The silicon carbide composite material connection device 100 further includes a second visual window 154 and a sealing plug 157. The second visual window 154 is provided on the device body 110. The temperature measuring element measures the temperature within the first accommodating cavity 111 through the second visual window 154. The sealing plug 157 is installed on the device body 110 via fasteners and is used to seal the gap between the device body 110 and the second visual window 154. Optionally, the temperature measuring element is an infrared thermometer; the second visual window 154 is made of sapphire glass, or the second visual window 154 can also be made of other high-temperature-resistant transparent materials.

[0077] In another embodiment, the silicon carbide composite material connection device 100 further includes a tungsten-rhenium thermocouple installed on the device body 110 and located on one side of the second flange 156 . The tungsten-rhenium thermocouple can also be used to measure the heating temperature in the first accommodating cavity 111 .

[0078] In summary, the present application provides a silicon carbide composite material connection device 100, which realizes the connection between the cladding tube 210 and the end plug 220 made of silicon carbide composite material by filling the first accommodating chamber 111 with gas of preset pressure and heating the connection between the cladding tube 210 and the end plug 220 extending into the first accommodating chamber 111, so that the connection material is solidified under the gas atmosphere and heating conditions and forms a connection layer; by setting the positioning hole 131 as a through hole, it is beneficial to improve the adaptability of the positioning sleeve 130, and also avoids the problem of the overall size of the silicon carbide composite material connection device 100 being too large due to the setting of a longer first accommodating chamber 111; by applying pressure to the brake member 152 through the pressurizing device 170, so that the brake member 152 pushes the cladding tube 210 toward the cooling tube 140 to the cooling channel 141, which can avoid the operator directly removing the cladding tube 210 from the first accommodating chamber 111, thereby effectively improving the safety of the operation.

[0079] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A silicon carbide composite material connecting device for connecting a cladding tube and two end plugs, wherein the cladding tube is provided with mounting holes at opposite ends along its axis, each of the mounting holes being used to mount an end plug, characterized in that: The silicon carbide composite material connecting device comprises: a device body, the device body having a first accommodating cavity, the first accommodating cavity being used to accommodate gas having a preset pressure, and the cladding tube and one of the end plugs connected to the cladding tube being able to extend into the first accommodating cavity; and a heating structure, the heating structure being provided on the device body and being used for heating the connection between the cladding tube and the end plug; The device body also has a second accommodating cavity, and the silicon carbide composite material connecting device also includes a heat insulating member, a mounting device and a positioning sleeve; The first accommodating cavity and the second accommodating cavity are separated from each other by the thermal insulation member, and the thermal insulation member is provided with an opening for the cladding tube to pass through; The mounting device is mounted on the device body and is located in the second accommodating cavity; The positioning sleeve is installed on the installation device and is located in the second accommodating cavity; the positioning sleeve is provided with a positioning hole along its axial direction, and the positioning sleeve fixes the cladding tube by means of the positioning hole.

2. The silicon carbide composite material connection device according to claim 1, characterized in that: The heating structure is configured to heat a connection between the cladding tube and the end plug in a non-contact manner.

3. The silicon carbide composite material connection device according to claim 2, characterized in that: The heating structure heats the connection between the cladding tube and the end plug by induction heating; the heating structure includes a heating source and a heating element; The heating source is provided in the device body and is located outside the first accommodating cavity; The heating element is mounted on the device body and is sleeved at intervals along the circumferential direction of the cladding tube at the connection between the cladding tube and the end plug located in the first accommodating cavity; The heating source is used for inductively heating the heating element, and the heating element can radiate heat to heat the connection between the cladding tube and the end plug.

4. The silicon carbide composite material connection device according to claim 2, characterized in that: The heating structure heats the connection between the cladding tube and the end plug by means of laser or electron beam.

5. The silicon carbide composite material connection device according to claim 1, characterized in that: The silicon carbide composite material connection device also includes a fluid source; The fluid source is connected to the first accommodating chamber, and the fluid source is used to input gas into the first accommodating chamber.

6. The silicon carbide composite material connection device according to claim 1, characterized in that: The positioning sleeve is provided with a plurality of positioning holes spaced apart along one side of its axial direction; Each of the positioning holes can be used to position a cladding tube.

7. The silicon carbide composite material connection device according to claim 6, characterized in that: All of the positioning holes penetrate the positioning sleeve along the axial direction of the positioning sleeve.

8. The silicon carbide composite material connection device according to claim 1, characterized in that: The silicon carbide composite material connecting device further includes a first visual window; The first viewing window is provided on the device body at a position corresponding to the second accommodating cavity, and is used for observing the situation in the second accommodating cavity.

9. The silicon carbide composite material connection device according to claim 1, characterized in that: The silicon carbide composite material connection device further includes a cooling pipe; The cooling pipe is mounted on the device body and is located on a side of the device body away from the first accommodating cavity along the axial direction of the cooling pipe, and a cooling channel is formed along the axial direction of the cooling pipe and passes through the cooling pipe, and the cooling channel can be used to accommodate the cladding tube and the end plug and cool the cladding tube and the end plug; Wherein, the axial direction of the cooling tube is parallel to the axial direction of the cladding tube.

10. The silicon carbide composite material connection device according to claim 9, characterized in that: The silicon carbide composite material connecting device further includes a brake member; The brake member is movably mounted on the device body along the axial direction of the cladding tube and is located on a side of the cladding tube away from the cooling tube, and one end of the brake member close to the cladding tube is located in the first accommodating cavity; The braking member can respond to an external force to push the end plug and the cladding tube to move along the axis of the cladding tube toward the cooling tube to the cooling channel.

11. The silicon carbide composite material connection device according to claim 1, characterized in that: The silicon carbide composite material connection device further includes a temperature measuring component; The temperature measuring element is used to measure the temperature in the first accommodating cavity.

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