A spiral feeding device capable of absorbing thermal displacement and a nuclear fuel conversion system

Abstract

The present invention belongs to the technical field of nuclear fuel conversion, and particularly relates to a spiral feeding device capable of absorbing thermal displacement and a nuclear fuel conversion system. The device is installed at the inlet of the reactor cylinder body and comprises: a blowing mechanism, the blowing mechanism includes an inclined feeding part and a horizontal feeding part arranged on one side of the top of the inclined feeding part, and the bottom end of the inclined feeding part is fixedly connected with the inlet of the reactor cylinder body through a first flange assembly; a spiral feeding mechanism, the spiral feeding mechanism is arranged on the side of the horizontal feeding part away from the inclined feeding part and is connected with the horizontal feeding part through a corrugated pipe connecting mechanism. Compared with the prior art, the device in the present invention avoids problems such as material jamming and outlet deviation caused by deformation of the equipment affected by temperature, reduces the influence of thermal displacement, ensures the smooth progress of the feeding process, reduces the number of maintenance inspections of the system, and reduces the operation cost of the equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear fuel conversion, and specifically relates to a spiral feeding device capable of absorbing thermal displacement and a nuclear fuel conversion system. Background Art

[0002] In a nuclear fuel conversion system, a spiral feeding device is used to convey materials into a main reactor. The spiral feeding device needs to ensure good sealing performance between the main reactor and the material conveying equipment to prevent gas leakage from the main reactor. Specifically, the spiral feeding device should have an effective sealing structure and sealing technology to meet the strict requirements of the nuclear fuel conversion system for gas tightness.

[0003] In the prior art, a feeding and dissolving device for nuclear fuel assembly production includes a material barrel 70. The lower end of the material barrel 70 is connected to a discharging bin 71. The lower end of the discharging bin 71 is connected to a feeding screw 72. A speed reducer 73 is connected to the feeding screw 72 to provide power for the feeding screw 72. The right end of the feeding screw 72 is connected to a blanking connecting pipe 74. An upper cover 75 is installed at the upper end of the blanking connecting pipe 74. The lower end of the blanking connecting pipe 74 is connected to a dissolving column feeding port 76.

[0004] Combined with the attached Figure 6 It can be seen that this feeding device is connected to the reactor of nuclear combustion through the feeding screw to supply fuel to the reactor. However, due to the high working temperature and relatively long overall structure of the reactor, when the equipment undergoes temperature changes due to the reaction, the reactor cylinder will expand when heated, resulting in a thermal displacement between the reactor cylinder and the feeding screw, causing the feeding position to shift, thereby affecting the feeding.

[0005] Based on this, the present invention provides a spiral feeding device capable of absorbing thermal displacement and a nuclear fuel conversion system to overcome the above defects. Summary of the Invention

[0006] An object of the present invention is to provide a spiral feeding device capable of absorbing thermal displacement. This device avoids problems such as material jamming and outlet offset caused by deformation of the equipment due to temperature effects, reduces the impact of thermal displacement, ensures the smooth progress of the feeding process, reduces the number of system maintenance and inspection times, and reduces the equipment operation cost.

[0007] The present invention adopts the following technical solutions:

[0008] A spiral feeding device capable of absorbing thermal displacement is installed at the inlet of the reactor cylinder and includes:

[0009] A blowing mechanism, the blowing mechanism includes an inclined feeding part and a horizontal feeding part provided on one side of the top of the inclined feeding part. The bottom end of the inclined feeding part is fixedly connected to the inlet of the reactor cylinder through a first flange assembly;

[0010] A spiral feeding mechanism, which is arranged on the side of the horizontal feeding part away from the inclined feeding part and is connected to the horizontal feeding part through a corrugated pipe connecting mechanism;

[0011] Wherein, the corrugated pipe connecting mechanism includes a corrugated pipe and straight pipe fittings. The straight pipe fittings include a left straight pipe and a right straight pipe. The left straight pipe and the right straight pipe are respectively arranged at the left and right ends of the corrugated pipe; and first flange plates are arranged at the outer ends of the left straight pipe and the right straight pipe;

[0012] The spiral feeding mechanism includes a feeding sleeve and a screw rotating shaft member. The feeding sleeve is inserted and installed into the horizontal feeding part of the blowing mechanism along the corrugated pipe connecting mechanism, and a second flange plate is arranged on the outer wall of the feeding sleeve. The second flange plate is connected to the first flange plate at the outer end of the right straight pipe; the screw rotating shaft member is inserted and installed in the feeding sleeve.

[0013] Furthermore, a nitrogen blowing feeding mechanism is fixedly installed at the top of the inclined feeding part.

[0014] Furthermore, the nitrogen blowing feeding mechanism includes:

[0015] An end cover, which is covered and installed at the top of the inclined feeding part;

[0016] A nitrogen blowing pipe, which extends from the end cover into the inclined feeding part.

[0017] Furthermore, two nitrogen blowing pipes are provided. One extends to be close to the bottom end of the inclined feeding part, and the other extends to be close to the outlet of the horizontal feeding part.

[0018] Furthermore, an external feeding pipe is fixedly installed at the inlet of the reactor cylinder body. The external feeding pipe is sleeved on the outer wall of the bottom end of the inclined feeding part, and the top end of the external feeding pipe is fixedly connected to the inclined feeding part through a first flange assembly.

[0019] Furthermore, the bottom end of the reactor cylinder body is welded to the external feeding pipe.

[0020] Furthermore, the bottom end of the inclined feeding pipe is in an inclined cone shape.

[0021] Furthermore, a pressure sensor and a temperature sensor are installed in the feeding sleeve.

[0022] Furthermore, at least one annular sealing groove is formed on the end face of one flange plate in the first flange assembly, and an annular protrusion matching the annular sealing groove is formed on the end face of the other flange plate in the first flange assembly. The annular protrusion is placed in the annular sealing groove;

[0023] And / or, at least one annular sealing groove is formed on the end face of the first flange or the second flange, and an annular protrusion matching with the annular sealing groove is formed on the end face of the second flange or the first flange, and the annular protrusion is placed in the annular sealing groove. Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In the heat-displacement-absorbable spiral feeding device of the present invention, during operation, in the process of nuclear fuel conversion, the material first enters the spiral feeding mechanism, and this mechanism pushes the material forward by virtue of its own rotational movement. The spiral feeding mechanism is connected to the horizontal feeding part of the blowing mechanism through a corrugated pipe connecting mechanism, and the horizontal feeding part plays a role of transition and guidance, guiding the material to the inclined feeding part. Due to its inclined structure, the inclined feeding part can utilize the gravity and the flow inertia of the material to smoothly introduce the material into the reactor cylinder.

[0025] Meanwhile, during the nuclear fuel conversion process, the temperature change of the reactor cylinder may cause its length to change, resulting in a thermal displacement between the blowing mechanism and the spiral feeding mechanism. At this time, the corrugated pipe connecting mechanism can adapt to this change through its own elastic deformation, avoiding damage to the connection part of the device or unsmooth material conveyance such as jamming due to thermal displacement, thereby improving the reliability and stability of the device. Specifically, when the reactor cylinder is heated and deformed, a small displacement along the axis of the cylinder will be generated, and the horizontally arranged corrugated pipe connecting mechanism can not only absorb the axial installation error, but also absorb a small lateral error or displacement, so this thermal displacement can be completely absorbed by the corrugated pipe. On the other hand, the blowing mechanism and the spiral feeding mechanism are connected by a corrugated connection mechanism, which not only ensures that the original function of conveying materials remains unchanged, but also ensures that the whole device has a certain sealing performance to prevent harmful gases from leaking through the blowing device; and reduces the number of maintenance inspections of the system, reducing the equipment operation cost.

[0026] In addition, the inclined feeding part is fixedly connected to the inlet of the reactor cylinder through the first flange assembly, ensuring the firmness and tightness of the connection, so that the material can accurately and stably enter the reactor cylinder for nuclear fuel conversion reaction. Correspondingly, the rigid connection of the flange assembly can fix the angle of the blowing mechanism, ensure that the angle between the blowing mechanism and the axis of the furnace body remains unchanged, and avoid angular displacement of the blowing mechanism.

[0027] The second object of the present invention is to provide a nuclear fuel conversion system, which includes the above-mentioned heat-displacement-absorbable spiral feeding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 Schematic diagram of the overall structure of the absorbable thermal displacement spiral feeding device according to a specific embodiment of the present invention;

[0030] Figure 2 For Figure 1 Schematic diagram of the structure of the blowing mechanism in;

[0031] Figure 3 For Figure 1 Schematic diagram of the structure of the bellows connection mechanism in;

[0032] Figure 4 For Figure 1 Schematic diagram of the structure of the spiral feeding mechanism in;

[0033] Figure 5 For Figure 1 Schematic diagram of the local structure in;

[0034] Figure 6 Schematic diagram of the structure of the feed-back dissolution feeding device for nuclear fuel assembly production in the prior art;

[0035] Wherein: reactor cylinder body 1, external feed pipe 10; blowing mechanism 2, inclined feeding part 20, horizontal feeding part 21; first flange assembly 3; spiral feeding mechanism 4, feeding sleeve 40, second flange 401, screw rotating shaft part 41; bellows connection mechanism 5, bellows 50, left straight pipe 51, right straight pipe 52, first flange 53; nitrogen blowing feeding mechanism 6, end cover 60, nitrogen blowing pipe 61; material barrel 70, discharging bin 71, feeding screw 72, speed reducer 73, feeding connecting pipe 74, upper cover 75, dissolution column feeding port 76; annular sealing groove 8; annular protrusion 9. Specific embodiments

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0037] The following combines the attached Figure 1 To the attached Figure 5 And specific embodiments to elaborate on the present invention in detail:

[0038] As Figures 1-5 shown, a spiral feeding device capable of absorbing thermal displacement is provided in the present invention. It is mainly used in the field of nuclear fuel conversion and can also be widely applied to process systems with thermal displacement between the input end and the output end, and can adapt to high-temperature and toxic medium conditions. The spiral feeding device is installed at the inlet of the reactor cylinder 1 and includes a blowing mechanism 2 and a spiral feeding mechanism 4.

[0039] Among them, the blowing mechanism 2 includes an inclined feeding part 20 and a horizontal feeding part 21 arranged on one side of the top of the inclined feeding part 20, presenting a structure similar to the shape of "r" as a whole; the bottom end of the inclined feeding part 20 is fixedly connected to the inlet of the reactor cylinder 1 through a first flange assembly 3. In this embodiment, the first flange assembly 3 is composed of two relatively arranged flange plates, and the two flange plates are fixedly connected by bolts, and the connection method is simple and reliable. The bottom end of the inclined feeding pipe 20 is in a tapered shape, and the tapered design makes the caliber of the bottom end of the feeding pipe gradually decrease, which can guide the material and ensure that the position where the material falls and is conveyed meets the requirements. Under the action of gravity and the flow inertia of the material itself, the material is more likely to concentrate and flow towards the inlet of the reactor cylinder 1, reducing the risk of material retention and blockage in the feeding pipe and ensuring the smoothness of material conveyance. At the same time, the tapered shape can accelerate the flow rate of the material. Since the caliber gradually decreases, the material is compressed to a certain extent during the flowing process, thereby increasing the flow rate of the material and improving the conveying efficiency of the material, enabling the material to enter the reactor cylinder 1 faster and meeting the continuous feeding requirements of the nuclear fuel conversion process.

[0040] The spiral feeding mechanism 4 is arranged on the side of the horizontal feeding part 21 away from the inclined feeding part 20 and is connected to the horizontal feeding part 21 through a bellows connection mechanism 5.

[0041] When the spiral feeding device capable of absorbing thermal displacement works, during the nuclear fuel conversion process, the material first enters the spiral feeding mechanism 4, and this mechanism pushes the material forward by virtue of its own rotational movement. The spiral feeding mechanism 4 is connected to the horizontal feeding part 21 of the blowing mechanism 2 through the bellows connection mechanism 5, and the horizontal feeding part 21 plays a role of transition and guidance, guiding the material to the inclined feeding part 20. Due to its inclined structure, the inclined feeding part 20 can utilize gravity and the flow inertia of the material to smoothly introduce the material into the reactor cylinder 1.

[0042] Meanwhile, during the nuclear fuel conversion process, the temperature change of the reactor cylinder 1 may cause its length to change, resulting in a thermal displacement between the blowing mechanism 2 and the screw feeding mechanism 4. At this time, the bellows connection mechanism 5 can adapt to this change through its own elastic deformation, avoiding damage to the connection parts of the device or unsmooth material transportation such as jamming due to thermal displacement, thereby improving the reliability and stability of the device. Specifically, when the reactor cylinder 1 is deformed by heat, a small downward displacement along the axis of the cylinder will occur. The horizontally arranged bellows connection mechanism 5 can not only absorb the axial installation error, but also absorb a small lateral error or displacement. Therefore, this thermal displacement can be completely absorbed by the bellows. On the other hand, the bellows connection mechanism 5 is used to connect the blowing mechanism 2 and the screw feeding mechanism 4, which not only ensures the original function of transferring materials remains unchanged, but also ensures that the entire device has a certain sealing performance to prevent harmful gases from leaking through the blowing device; and reduces the number of maintenance inspections of the system, reducing the operating cost of the equipment.

[0043] In addition, the inclined feeding part 20 is fixedly connected to the inlet of the reactor cylinder 1 through the first flange assembly 3, ensuring the firmness and sealing of the connection, so that the material can accurately and stably enter the reactor cylinder 1 for the nuclear fuel conversion reaction. Correspondingly, the rigid connection of the flange assembly can fix the angle of the blowing mechanism 2, ensure that the angle between the blowing mechanism 2 and the axis of the furnace body remains unchanged, and avoid angular displacement of the blowing mechanism 2.

[0044] Among them, as Figure 1 、 3 shown, the bellows connection mechanism 5 includes a bellows 50 and straight pipe fittings.

[0045] The bellows 50 has good elastic deformation ability. During the nuclear fuel conversion process, when the temperature change of the reactor cylinder 1 causes the length to change, the bellows 50 can adapt to the thermal displacement generated between the blowing mechanism 2 and the screw feeding mechanism 4 through its own telescopic deformation, avoiding damage to the connection parts due to thermal stress, and ensuring the reliability and stability of the device. At the same time, the bellows 50 is usually made of metal or other elastic materials.

[0046] The straight pipe fittings include a left straight pipe 51 and a right straight pipe 52. The left straight pipe 51 and the right straight pipe 52 are respectively arranged at the left and right ends of the bellows 50; and first flange plates 53 are welded on the outer ends of the left straight pipe 51 and the right straight pipe 52 respectively, and are respectively used for fixedly connecting with the horizontal feeding part 21 of the blowing mechanism 2 and the screw feeding mechanism 4. First flange plates 53 are arranged at both ends of the straight pipe fittings. The flange connection method has the advantages of firm connection and convenient disassembly, and can ensure the stability of the bellows connection mechanism 5 during the material transfer process.

[0047] As Figure 1 、 2As shown, the spiral feeding mechanism 4 includes a feeding sleeve 40 and a spiral rotating shaft member 41. The feeding sleeve 40 is inserted and installed into the horizontal feeding part 21 of the blowing mechanism 2 along the bellows connecting mechanism 5, and a second flange 401 is welded on the outer wall of the feeding sleeve 40. The second flange 401 is connected to the first flange 53 at the outer end of the right straight pipe 52; it should be noted that when the first flange 53 and the second flange 401 are connected, the tightness of the connection part can be enhanced by installing a sealing gasket or using sealant, etc. The tightness and rigidity of the flange connection can effectively prevent harmful gases from leaking through the bellows connecting mechanism 5. The feeding sleeve 40 can be made of materials with certain strength and corrosion resistance to adapt to the working environment in the field of nuclear fuel conversion. It should be noted that when designing the length and diameter of the feeding sleeve 40, the diameter of the horizontal feeding part 21 of the blowing mechanism 2 and the clearance at the intersection of the inclined feeding part 20 and the horizontal feeding part 21 need to be comprehensively considered, and enough clearance should be left to ensure that there is no collision between the feeding sleeve 40 and the blowing mechanism 2 after the thermal deformation of the reactor cylinder 1.

[0048] The spiral rotating shaft member 41 is inserted and installed in the feeding sleeve 40. The spiral rotating shaft member 41 can be connected to an external power source through a coupling or other transmission devices, etc., to drive the spiral rotating shaft member 41 to rotate and push the material forward. Preferably, the spiral rotating shaft member 41 is made of high-strength and wear-resistant materials to ensure that it can withstand the frictional force of the material and the driving torque of the external power source during long-term operation. The surface of the spiral rotating shaft member 41 is treated for smoothness and hardness to improve its surface hardness and smoothness, reduce the adhesion of the material on it, and improve the material conveying efficiency.

[0049] The feeding sleeve 40 is connected to the right straight pipe 52 of the bellows connecting mechanism 5 and the horizontal feeding part 21 of the blowing mechanism 2 to form a stable material transmission channel. The second flange 401 welded on its outer wall is tightly connected to the first flange 53 at the outer end of the right straight pipe 52, enhancing the tightness of the connection part, effectively preventing harmful gas leakage, and at the same time improving the structural stability of the whole device.

[0050] In some more specific embodiments, the feed sleeve 40 needs to extend into the horizontal feed part 21 of the blowing mechanism 2, near the inclined feed part 20 of the blowing mechanism 2, to prevent the material from falling into the bellows 50 of the bellows connection mechanism 5 and damaging the bellows 50. The accumulation of material in the bellows may change the elastic characteristics of the bellows, affect its ability to absorb thermal displacement, and may even cause the bellows to be blocked, affecting the normal transportation of the material. If the elasticity of the bellows is affected, during the nuclear fuel conversion process, when the temperature of the reactor cylinder changes, the bellows may not be able to effectively absorb thermal displacement, resulting in damage to the device connection part or poor material transportation. By preventing the material from falling into the bellows, the elastic performance of the bellows can be maintained, ensuring the stable operation of the device in a thermal change environment.

[0051] Further, in some specific embodiments, such as Figure 1 shown, a nitrogen-blowing feed mechanism 6 is fixedly installed at the top of the inclined feed part 20, which can blow nitrogen to blow the material accumulated in the inclined feed part 20 into the reactor cylinder 1. The nitrogen-blowing feed mechanism 6 includes an end cover 60 and a nitrogen-blowing pipe 61.

[0052] The end cover 60 is cover-mounted on the top of the inclined feed part 20; specifically, the end cover 60 can be fixedly installed on the top of the inclined feed part 20 through a flange assembly to achieve the fixed installation of the end cover 60, preventing relative displacement between the nitrogen-blowing feed mechanism 6 and the reactor cylinder 1. At the same time, the connection of the flange assembly has the advantages of convenient disassembly and replacement, etc.; the end cover 60 covers the top of the inclined feed part 20 and is fixedly installed through the flange assembly, which can provide good sealing performance, prevent external impurities, dust, moisture, etc. from entering the inclined feed part, ensure the purity of the material during transportation, and avoid adverse effects on the nuclear fuel conversion process.

[0053] The nitrogen-blowing pipe 61 extends from the end cover 60 into the inclined feeding part 20. In this embodiment, two nitrogen-blowing pipes 61 are provided. One extends to near the bottom end of the inclined feeding part 20, and the other extends to near the outlet of the horizontal feeding part 21, and the accumulated materials are blown to the outlet at the bottom end of the inclined feeding part 20 by air pressure. During the material transportation process, nitrogen can be blown into the inclined feeding part 20, and the airflow of nitrogen is used to push the materials to flow, improving the transportation efficiency and speed of the materials. The flow of nitrogen can reduce the risk of accumulation and blockage of the materials in the inclined feeding part 20, ensuring that the materials smoothly enter the reactor cylinder 1. At the same time, in the field of nuclear fuel conversion, some materials may have the characteristics of being flammable and easy to oxidize. Blowing nitrogen can form an inert atmosphere in the inclined feeding part 20, reducing the chance of contact between the materials and oxygen, preventing the oxidation and combustion of the materials, and improving the safety of the equipment. In addition, introducing nitrogen to achieve nitrogen sealing can prevent corrosive gases from entering the gap between the outer feeding pipe 10 and the blowing mechanism 2, further avoiding corrosion of flanges, etc.

[0054] In summary, the design of the nitrogen-blowing feeding mechanism 6 can improve the performance and reliability of the screw feeding device, providing better material transportation and processing conditions for the nuclear fuel conversion process.

[0055] It should be noted that during actual use, for some nuclear fuels, heated nitrogen can be introduced into the nitrogen-blowing pipe 61 of the nitrogen-blowing feeding mechanism 6 for heating or preheating treatment of the fuel. By blowing heated nitrogen for heating or preheating treatment of the nuclear fuel, the heat can be more evenly distributed in the nuclear fuel. Compared with the traditional direct heating method, nitrogen as a heat transfer medium can better contact the nuclear fuel, reducing the risk of local overheating, thereby improving the heating uniformity. And the heated nitrogen can quickly transfer the heat to the nuclear fuel, thus shortening the heating or preheating time and improving the production efficiency. In addition, due to the good heat transfer performance of nitrogen, the energy consumption can be reduced and the production cost can be lowered.

[0056] Furthermore, in some specific embodiments, as Figure 1 shown, an outer feeding pipe 10 is fixedly installed at the inlet of the reactor cylinder 1. It should be noted that there are various ways to fixedly install the outer feeding pipe 10 at the inlet of the reactor cylinder 1, such as welding, flange connection, etc. In this embodiment, the bottom end of the reactor cylinder 1 is welded to the outer feeding pipe 10, with a simple implementation method and good connection reliability.

[0057] Meanwhile, the outer feed pipe 10 is sleeved on the outer wall of the bottom end of the inclined feed part 20, and its inner diameter is slightly larger than the outer diameter of the inclined feed part 20, so that the bottom end of the inclined feed part 20 can be smoothly inserted into the inner part of the outer feed pipe 10. The top end of the outer feed pipe 10 is connected to the middle part of the inclined feed part 20 through the first flange assembly 3, realizing the fixed connection between the outer feed pipe 10 and the inclined feed part 20 of the blowing mechanism 2. To ensure the connection tightness, a sealing gasket can also be installed between the flange plates of the first flange assembly 3. The sealing gasket is made of high-temperature resistant and corrosion-resistant materials, which can effectively prevent material leakage and external gas from entering the reactor cylinder 1.

[0058] First of all, the outer feed pipe 10 is sleeved on the outer wall of the bottom end of the inclined feed part 20 and fixedly connected through the first flange assembly. This design provides double connection guarantees. On the one hand, the sleeving of the outer feed pipe 10 increases the contact area of the connection, improving the connection stability; on the other hand, the use of the first flange assembly 3 makes the connection more firm and reliable, and can withstand various stresses and vibrations generated during the nuclear fuel conversion process.

[0059] This stable connection method can ensure that the material can smoothly enter the reactor cylinder 1 from the inclined feed part 20, avoiding material leakage or conveying interruption caused by loose or unstable connection, and improving the reliability and safety of the device.

[0060] Secondly, the design of the outer feed pipe 10 makes the connection between the inclined feed part 20 and the reactor cylinder 1 more convenient. During the installation process, only need to insert the bottom end of the inclined feed part 20 into the inner part of the outer feed pipe 10, and then fix it through the first flange assembly 3. This installation method is simple and fast, reducing the installation time and workload. And when maintenance or repair is needed, only need to loosen the bolts and nuts on the first flange assembly 3, and the inclined feed part 20 can be taken out from the outer feed pipe 10 to carry out corresponding maintenance or repair work, improving the maintainability of the equipment.

[0061] Furthermore, a pressure sensor for monitoring the material pressure and a temperature sensor for monitoring the material temperature can also be installed in the feed sleeve 40. The pressure sensor and the temperature sensor are both electrically connected to the controller of the screw feeding device to realize real-time monitoring.

[0062] In this embodiment, two pressure sensors are provided and are respectively arranged on the inner walls at both ends of the feeding sleeve 40. They can monitor the initial state of the material when it enters the sleeve and the state when it leaves the sleeve, comprehensively understand the pressure change of the material during the conveying process, and provide an important basis for judging the fluidity and blockage condition of the material, etc. At the same time, the pressure sensors can timely detect possible blockage or overload conditions of the material during the conveying process. When the pressure exceeds the set value, the controller can take corresponding measures, such as stopping the feeding, clearing the blockage, etc., to protect the equipment and ensure the smooth progress of production.

[0063] One temperature sensor is provided and is arranged on the inner wall in the middle of the feeding sleeve 40. The temperature sensor can timely detect the abnormal increase in the material temperature and provide a warning signal for preventing fires and explosions. The controller can take corresponding measures according to the temperature signal, such as stopping the feeding, starting the cooling system, etc., to ensure production safety.

[0064] Installing pressure sensors and temperature sensors in the feeding sleeve 40 and electrically connecting them to the controller of the screw feeding device for real-time monitoring can achieve comprehensive monitoring of the material conveying process, improve the safety, stability and efficiency of the production process, and at the same time contribute to optimizing the production process and reducing production costs.

[0065] Further, at least one annular sealing groove 8 is formed on the end face of one flange plate in the first flange assembly 3, and an annular protrusion 9 matching the annular sealing groove 8 is formed on the end face of the other flange plate in the first flange assembly 3. The annular protrusion 9 is placed in the annular sealing groove 8.

[0066] Similarly, at least one annular sealing groove 8 can be formed on the end face of the first flange plate 53 or the second flange plate 401, and an annular protrusion 9 matching the annular sealing groove 8 is formed on the end face of the second flange plate 401 or the first flange plate 53. The annular protrusion 9 is placed in the annular sealing groove 8.

[0067] The cooperation between the annular protrusion 9 and the annular sealing groove 8 can form a multi-layer sealing structure, effectively preventing fluid leakage at the flange connection. Whether it is gas, liquid or other media, they can be better sealed in the system, improving the reliability and safety of the system. At the same time, in the pipeline system, the pressure may fluctuate. This design can better adapt to the pressure change. The annular protrusion 9 can make a certain degree of adjustment in the annular sealing groove 8 along with the pressure change, maintaining a good sealing effect.

[0068] The cooperation between the annular protrusion 9 and the annular sealing groove 8 can increase the contact area between the flanges, thereby improving the connection strength and stability. When subjected to external forces or vibrations, the flange connection is not easily loosened or deformed, and it can also effectively prevent the misalignment of the flanges during installation and use.

[0069] It should be noted that a sealing ring can also be arranged in the annular sealing groove 8. The sealing ring can further fill the possible tiny gaps between the annular protrusion 9 and the sealing groove, greatly improving the sealing reliability and effectively preventing the leakage of various fluid media. At the same time, the sealing ring plays a buffering role between the flanges. When the system is subjected to vibrations, impacts or thermal expansion and contraction caused by temperature changes, the sealing ring can absorb part of the energy, reduce the influence on the flange connection, thereby enhancing the connection stability and reducing the risk of damage to the connection part due to external forces.

[0070] The sealing ring adopts a special structural design inside and contains shape memory materials. The shape memory materials can automatically adjust their shapes according to the changes of environmental factors such as temperature and pressure, so as to dynamically compensate the sealing gap. When the temperature changes during the operation of the system, resulting in thermal expansion and contraction of the flange connection part, or when the pressure fluctuates, the shape memory sealing ring can automatically change its shape to adapt to the changes and always maintain a good sealing effect. At the same time, the shape memory materials have good elastic recovery ability and can closely adhere to the flange surface. Even when there are tiny irregularities or scratches on the flange surface, it can ensure that there is no gap between the sealing ring and the flange, improving the sealing reliability. In addition, a certain pressure will be generated during the process of the shape memory sealing ring restoring its shape, and this pressure can enhance the fastening force of the flange connection, making the connection between the flanges more firm.

[0071] Based on the above-mentioned spiral feeding device capable of absorbing thermal displacement, the present invention also provides a nuclear fuel conversion system, including the above-mentioned spiral feeding device capable of absorbing thermal displacement. This nuclear fuel conversion system includes all the technical solutions of the above-mentioned spiral feeding device capable of absorbing thermal displacement and at least has all the advantages of the above-mentioned spiral feeding device capable of absorbing thermal displacement, which will not be elaborated here.

[0072] The above further describes the present invention with the help of specific embodiments. However, it should be understood that this specific description should not be construed as a limitation on the essence and scope of the present invention. Various modifications made by those of ordinary skill in the art to the above embodiments after reading this specification all fall within the scope protected by the present invention.

Claims

1. A spiral feeding device capable of absorbing thermal displacement, installed at the inlet of the reactor cylinder, characterized in that: include: A blowing mechanism, wherein the blowing mechanism comprises an inclined feeding portion and a horizontal feeding portion arranged on one side of the top of the inclined feeding portion, wherein the inclined feeding portion and the horizontal feeding portion form an "R"-shaped structure, and the bottom end of the inclined feeding portion is fixedly connected to the inlet of the reactor cylinder through a first flange assembly; A spiral feeding mechanism, the spiral feeding mechanism is arranged on a side of the horizontal feeding portion away from the inclined feeding portion, and is connected to the horizontal feeding portion through a bellows connecting mechanism, the bellows connecting mechanism is arranged horizontally and can absorb axial and lateral displacements; Wherein, the bellows connection mechanism comprises a bellows and a straight pipe; the straight pipe comprises a left straight pipe and a right straight pipe, the left straight pipe and the right straight pipe are respectively arranged at the left and right ends of the bellows; and a first flange is arranged at the outer ends of the left straight pipe and the right straight pipe; The spiral feeding mechanism includes a feeding sleeve and a spiral rotating shaft; the feeding sleeve is inserted and installed into the horizontal feeding part of the blowing mechanism along the corrugated pipe connecting mechanism, and the feeding sleeve extends into the horizontal feeding part of the blowing mechanism, close to the inclined feeding part of the blowing mechanism; and a second flange is arranged on the outer wall of the feeding sleeve, and the second flange is connected to the first flange at the outer end of the right straight pipe; the spiral rotating shaft is inserted and installed in the feeding sleeve.

2. The spiral feeding device capable of absorbing thermal displacement according to claim 1, characterized in that: A nitrogen blowing feeding mechanism is fixedly installed on the top of the inclined feeding part.

3. The spiral feeding device capable of absorbing thermal displacement according to claim 2, characterized in that: The nitrogen blowing feeding mechanism comprises: An end cover, the end cover is mounted on the top of the inclined feeding part; A nitrogen blowing pipe extends from the end cover into the inclined feed portion.

4. The spiral feeding device capable of absorbing thermal displacement according to claim 3 is characterized in that: Two nitrogen blowing pipes are provided, one extending to the bottom end close to the inclined feed portion, and the other extending to the outlet close to the horizontal feed portion.

5. The spiral feeding device capable of absorbing thermal displacement according to claim 1, characterized in that: An external feed pipe is fixedly installed at the inlet of the reactor cylinder, the external feed pipe is sleeved on the outer wall of the bottom end of the inclined feed part, and the top end of the external feed pipe is fixedly connected to the inclined feed part through a first flange assembly.

6. The spiral feeding device capable of absorbing thermal displacement according to claim 5, characterized in that: The reactor barrel is connected to the bottom end of the external feed pipe by welding.

7. The spiral feeding device capable of absorbing thermal displacement according to claim 1, characterized in that: The bottom end of the inclined feeding portion is in an oblique cone shape.

8. The spiral feeding device capable of absorbing thermal displacement according to claim 1, characterized in that: A pressure sensor and a temperature sensor are installed in the feed sleeve.

9. The spiral feeding device capable of absorbing thermal displacement according to claim 1, characterized in that: At least one annular sealing groove is provided on an end surface of one flange in the first flange assembly, and an annular protrusion matching the annular sealing groove is formed on an end surface of another flange in the first flange assembly, and the annular protrusion is placed in the annular sealing groove; And / or, at least one annular sealing groove is opened on the end surface of the first flange or the second flange, and an annular protrusion matching the annular sealing groove is formed on the end surface of the second flange or the first flange, and the annular protrusion is placed in the annular sealing groove.

10. A nuclear fuel conversion system, characterized in that: A screw feeding device capable of absorbing thermal displacement comprising the above-mentioned one of claims 1 to 9.

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