A spherical fuel spiral reverse rotation vertical lifting device

Abstract

The invention discloses a spherical fuel spiral reverse rotation vertical lifting device, comprising a containing tube body, a driving device, a shaft body, a spiral blade, a baffle and a descending pipeline, the containing tube body is filled with inert gas, the shaft body is rotated and built into the containing tube body, the spiral blade is arranged on the outer wall of the shaft body, the baffle is vertically arranged on the inner wall of the containing tube body, there is a gap between the baffle and the outer wall of the spiral blade, the vertical spacing between adjacent spiral blades is greater than the diameter of the spherical fuel, the width of the spiral blade is greater than the radius of the spherical fuel and less than the diameter of the spherical fuel, the distance between the outer wall of the shaft body and the inner wall of the containing tube body is greater than the diameter of the spherical fuel, the containing tube body is provided with a discharge port and a feed port, the descending pipeline is connected with the discharge port and the feed port, the driving device is connected with the shaft body, and the nuclear reactor pressure vessel is arranged on the descending pipeline. The structure is simple, the vertical lifting height is unlimited, the application range is wider, the economy is better, and the reliability is higher.

Description

Technical Field

[0001] The invention relates to the field of transmission technology, in particular to a spherical fuel spiral reverse rotation vertical lifting device. Background Art

[0002] The spherical fuel loading and unloading cycle of a high-temperature gas-cooled reactor nuclear power plant relies on a helium compressor to provide the pneumatic conveying power source required for lifting the spherical fuel. Under normal operating conditions, the spherical fuel is transported by helium pneumatically for the main circulation of the core, the unloading of spent fuel and the injection of new fuel. During the pneumatic circulation transmission process, the spherical fuel continuously rubs and collides with the inner wall of the pipeline and the unloading device, ball crushing separation equipment, fuel consumption measurement equipment, bridge connector and other equipment.

[0003] The spherical fuel loading and unloading cycle of high temperature gas-cooled reactor nuclear power plant adopts an escalator-type fuel transfer device as an optimized alternative. According to the requirements of radiation zoning and fire protection zoning of nuclear power plants, this solution adopts a multi-section escalator-type fuel transfer device connected with a slotted roller to realize the spherical fuel loading and unloading cycle, spent fuel discharge and new spherical fuel injection.

[0004] Shortcoming 1: The spherical fuel loading and unloading cycle uses helium pneumatic conveying. Under normal working conditions, the spherical fuel needs to rely on the helium compressor to provide the pneumatic conveying power source required for lifting during the pneumatic circulation transmission process. The insufficient reliability of the helium compressor causes the spherical fuel cycle to lose the power source, resulting in the passive shutdown of the reactor; at the same time, during the pneumatic circulation transmission process, the requirements for the inner diameter of the pneumatic transmission pipeline and the bulge and depression of the inner wall of the pipeline weld are high. The spherical fuel continues to rub and collide with the pipe wall, and the fuel dust and debris generated often cause spherical fuel jam accidents, so that the spherical fuel cannot be transmitted and circulated, resulting in the passive shutdown of the reactor; the number of spherical fuels in the pneumatic conveying pipeline and the deviation of the fuel ball size have different requirements for the pneumatic conveying pressure parameters, which aggravates the retention and vibration of the spherical fuel in the pipeline, resulting in spherical fuel jams and unstable system operation.

[0005] Shortcoming 2: Under the conditions of spherical fuel jamming accidents, it is difficult to find and troubleshoot the spherical fuel jamming points in high temperature, high pressure, high radioactivity environment and complex pipeline environment. Some jamming points are inaccessible to maintenance personnel and maintenance tools, and eliminating spherical fuel jamming accidents can easily lead to radioactive leakage.

[0006] Insufficiency 3: The spherical fuel loading and unloading cycle uses an escalator-type fuel transfer device for transportation. The spherical fuel loading and unloading cycle of the high-temperature gas-cooled reactor nuclear power plant uses an escalator-type fuel transfer device as an optimized alternative. During the implementation of the project, the escalator-type fuel transfer device must maintain a certain angle with the horizontal plane, generally less than 45°, and requires a large building area and space, with high construction costs; spherical fuel uses a multi-section escalator-type fuel transfer device and a slotted roller to achieve continuous transmission, and the equipment manufacturing and installation are high in precision and cost; the escalator-type fuel transfer device is complex and difficult to maintain.

[0007] Therefore, how to provide a spherical fuel spiral reverse rotation vertical lifting device to improve reliability is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0008] In view of this, an object of the present invention is to provide a spherical fuel spiral reverse rotation vertical lifting device to improve reliability.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] A spherical fuel spiral reverse rotation vertical lifting device, comprising a containing tube body, a driving device, a shaft body, spiral blades, a baffle and a descending pipeline, wherein:

[0011] The containing tube is filled with an inert gas.

[0012] The shaft body is vertically rotatable and built into the containing tube body, and the spiral blades are arranged on the outer wall of the shaft body in a circumferential manner along the axis direction of the shaft body.

[0013] The baffle is vertically arranged on the inner wall of the containing tube body, the baffle is located between the outer wall of the spiral blade and the inner wall of the containing tube body, and there is a gap between the baffle and the outer wall of the spiral blade.

[0014] The vertical spacing between adjacent spiral blades is greater than the diameter of the spherical fuel, the width of the spiral blade is greater than the radius of the spherical fuel and smaller than the diameter of the spherical fuel, and the distance between the outer wall of the shaft body and the inner wall of the containing tube body is greater than the diameter of the spherical fuel.

[0015] The upper part of the containing tube body is provided with a discharge port, the lower part of the containing tube body is provided with a feed port, one end of the descending pipe is connected with the discharge port, and the other end of the descending pipe is connected with the feed port.

[0016] The driving device is connected to the shaft body.

[0017] The nuclear reactor pressure vessel is arranged on the descending pipe.

[0018] The spherical fuel enters the containing tube body from the feed inlet and falls on the spiral blades. The driving device drives the spiral blades to rotate through the shaft. The spiral blades drive the spherical fuel to rise upward along the baffle until the discharge port. The spherical fuel enters the descending pipe from the discharge port and slides down to the nuclear reactor pressure vessel under the action of gravity. The spherical fuel discharged from the nuclear reactor pressure vessel slides down to the feed inlet for cyclic transmission.

[0019] Preferably, a spherical fuel unit for stopping the rolling of the spherical fuel is provided at the connection between the descending pipe and the feed inlet.

[0020] The spiral blade is provided with a single-vessel ball taking groove for taking the spherical fuels out of the spherical fuel single vessel one at a time.

[0021] Preferably, the driving device is a permanent magnet shielded motor, the driving device is arranged outside the containing tube body, and the driving device has no contact with the shaft body.

[0022] Preferably, a section of the pipe connecting the descending pipe to the feed inlet is grooved at the bottom, and a collecting device is provided below the groove.

[0023] Preferably, the bottom of the containing tube body is provided with an exclusion orifice plate.

[0024] One end of the shaft is rotatably disposed on the exclusion orifice plate.

[0025] A discharge pipe is arranged below the discharge orifice plate.

[0026] Preferably, the angle between the spiral blade and the horizontal plane is ≥0° to less than 90°.

[0027] Preferably, a rolling body is provided on the blade surface of the spiral blade supporting the spherical fuel.

[0028] Preferably, the baffle is an L-shaped baffle.

[0029] Rolling bodies are arranged on both surfaces of the baffle plate in contact with the spherical fuel.

[0030] Preferably, the width of the spiral blade is 0.8 times the diameter of the spherical fuel.

[0031] The included angle between the spiral blade and the horizontal plane is 30°.

[0032] Preferably, the root of the spiral blade is higher than the edge of the blade.

[0033] The spherical fuel spiral reverse rotation vertical lifting device provided by the present invention comprises a containing tube body, a driving device, a shaft body, spiral blades, a baffle and a descending pipeline, wherein:

[0034] The containing tube is filled with an inert gas.

[0035] The shaft body is vertically rotatable and built into the containing tube body, and the spiral blades are arranged on the outer wall of the shaft body in a circumferential manner along the axis direction of the shaft body.

[0036] The baffle is vertically arranged on the inner wall of the containing tube body, the baffle is located between the outer wall of the spiral blade and the inner wall of the containing tube body, and there is a gap between the baffle and the outer wall of the spiral blade.

[0037] The vertical spacing between adjacent spiral blades is greater than the diameter of the spherical fuel, the width of the spiral blade is greater than the radius of the spherical fuel and smaller than the diameter of the spherical fuel, and the distance between the outer wall of the shaft body and the inner wall of the containing tube body is greater than the diameter of the spherical fuel.

[0038] The upper part of the containing tube body is provided with a discharge port, the lower part of the containing tube body is provided with a feed port, one end of the descending pipe is connected with the discharge port, and the other end of the descending pipe is connected with the feed port.

[0039] The driving device is connected to the shaft body.

[0040] The nuclear reactor pressure vessel is arranged on the descending pipe.

[0041] The spherical fuel enters the containing tube body from the feed inlet and falls on the spiral blades. The driving device drives the spiral blades to rotate through the shaft. The spiral blades drive the spherical fuel to rise upward along the baffle until the discharge port. The spherical fuel enters the descending pipe from the discharge port and slides down to the nuclear reactor pressure vessel under the action of gravity. The spherical fuel discharged from the nuclear reactor pressure vessel slides down to the feed inlet for cyclic transmission.

[0042] The spherical fuel spiral reverse rotation vertical lifting device provided by the present invention has a simple structure, no limit on the vertical lifting height, a wider range of applications, better economy and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the structure of a spherical fuel spiral reverse rotation vertical lifting device provided by an embodiment of the present invention;

[0045] Figure 2 for Figure 1 Schematic diagram of CC cross-sectional structure;

[0046] Figure 3 for Figure 1 Schematic diagram of the B-direction structure;

[0047] Figure 4 for Figure 1 AA cross-sectional structural diagram;

[0048] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at location I.

[0049] Figure 1-5 middle:

[0050] Spherical fuel 1, slotted raceway 2, ball end connecting pipe 3, spherical fuel single device 4, discharge pipe 5, spherical fuel spiral reverse rotation vertical lifting device 6, discharge orifice plate 7, first-stage spiral blade 8, fork-shaped wall plate 9, shaft body 10, containing tube body 11, ball outlet end connecting pipe 12, bearing seat 13, solid lubrication bearing 14, stator 15, shielding cover 16, end cover 17, driving device 18, spiral blade 19, ball 20, fork 21, slot 21, ball 23, single device ball taking groove 24, nuclear reactor pressure vessel 25, unloading device 26, collecting device 27. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Please refer to Figures 1 to 5 , Figure 1 A schematic diagram of the structure of a spherical fuel spiral reverse rotation vertical lifting device provided by an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of CC cross-sectional structure; Figure 3 for Figure 1 Schematic diagram of the B-direction structure; Figure 4 for Figure 1 AA cross-sectional structural diagram; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at location I.

[0053] The spherical fuel spiral reverse rotation vertical lifting device provided in the embodiment of the present invention comprises a containing tube body 11, a driving device 18, a shaft body 10, a spiral blade 19, a baffle and a descending pipeline, wherein:

[0054] The containing tube body 11 is filled with an inert gas.

[0055] The shaft body 10 is vertically rotatable and built into the containing tube body 11. The spiral blades 19 are arranged on the outer wall of the shaft body 10 in a circumferential direction along the axis of the shaft body 10.

[0056] The baffle is vertically arranged on the inner wall of the containing tube body 11, and is located between the outer wall of the spiral blade 19 and the inner wall of the containing tube body 11, and there is a gap between the baffle and the outer wall of the spiral blade 19. The baffle may be a fork-shaped wall plate 9.

[0057] The vertical spacing between adjacent spiral blades 19 is greater than the diameter of the spherical fuel 1, the width of the spiral blade 19 is greater than the radius of the spherical fuel 1 and smaller than the diameter of the spherical fuel 1, and the distance between the outer wall of the shaft body 10 and the inner wall of the containing tube body 11 is greater than the diameter of the spherical fuel 1.

[0058] The upper part of the containing tube body 11 is provided with a discharge port, the lower part of the containing tube body 11 is provided with a feed port, one end of the descending pipe is connected with the discharge port, and the other end of the descending pipe is connected with the feed port.

[0059] The driving device 18 is connected to the shaft body 10.

[0060] The nuclear reactor pressure vessel 25 is arranged on the descending pipeline.

[0061] The spherical fuel 1 enters the containing tube body 11 from the inlet and falls on the spiral blade 19. The driving device 18 drives the spiral blade 19 to rotate through the shaft body 10. The spiral blade 19 drives the spherical fuel 1 to rise upward along the baffle until it reaches the outlet. The spherical fuel 1 enters the descending pipe from the outlet and slides down to the nuclear reactor pressure vessel 25 under the action of gravity. The spherical fuel 1 discharged from the nuclear reactor pressure vessel 25 slides down to the inlet for cyclic transmission.

[0062] The spherical fuel spiral reverse rotating vertical lifting device provided in the embodiment of the present invention has a simple structure, a wider range of applications, better economy, higher reliability, and theoretically no limit to the vertical lifting height.

[0063] In order to further optimize the above solution, a spherical fuel unit 4 for stopping the rolling of the spherical fuel 1 is provided at the connection between the downward pipeline and the feed inlet.

[0064] The spiral blade 19 is provided with a single-vessel ball taking groove 24 for taking out the spherical fuels 1 from the spherical fuel single vessel 4 one at a time.

[0065] The spherical fuel 1 is scored one by one at the scoring end of the containing tube body 11 through the spherical fuel unit 4. The spacing between two adjacent spherical fuels 1 can be achieved by adjusting the distance between the two adjacent unit ball taking grooves 24, so as to control according to actual needs and achieve continuous and uninterrupted circulation.

[0066] In order to further optimize the above solution, the driving device 18 is a permanent magnet shielded motor, and the driving device 18 is arranged outside the containing tube body 11. The driving device 18 has no contact with the shaft body 10 to avoid leakage of inert gas caused by opening.

[0067] Specifically, the inert gas can be helium, the shaft 10 and spiral components such as spiral blades 19 are built into the helium atmosphere of the high-temperature, high-pressure and high-radioactive containment tube 11, and the permanent magnet shielded motor drive is placed outside the containment tube 11.

[0068] Among them, the spiral shaft is installed vertically, and the upper and lower ends of the shaft 10 are fixed in the inner cavity of the pressure-bearing containing tube 11 through horizontally installed solid lubrication bearings 14 and bearing seats 13. The torque of the shaft 10 relies on the input of the permanent magnet shielded motor to avoid the torque transmission causing the containing tube 11 to open, thereby realizing contactless torque static sealing transmission and preventing helium leakage and radioactive escape.

[0069] In order to further optimize the above scheme, a groove 21 is formed at the bottom of a section of the pipe connecting the downward pipe and the feed port, and a collecting device 27 is provided below the groove 21. It is used to handle debris such as dust and debris to avoid obstruction. For example, fuel dust and debris flow into the dust collecting device through the groove 21 and the dust removal screen and are removed.

[0070] In order to further optimize the above scheme, an orifice plate 7 is provided at the bottom of the containing tube body 11, one end of the shaft body 10 is rotatably provided on the orifice plate 7, and an exhaust pipe 5 is provided below the orifice plate 7 to exhaust dust, debris and other sundries to avoid obstruction.

[0071] In order to further optimize the above solution, the angle between the spiral blade 19 and the horizontal plane is ≥0° to less than 90°, preferably 30°.

[0072] In order to further optimize the above solution, rolling bodies are arranged on the blade surface of the spiral blade 19 that supports the spherical fuel 1 .

[0073] In order to further optimize the above solution, the baffle is an L-shaped baffle, and rolling bodies are arranged on the two surfaces of the baffle that contact the spherical fuel 1.

[0074] Specifically, the rolling body can be a spherical ball that can realize the rolling of the spherical fuel 1. By installing the rolling body on the spiral blade 19 and the baffle, rolling friction is generated during the spiral lifting of the spherical fuel 1, avoiding friction damage to the spherical fuel 1 caused by sliding friction, and reducing the generation of graphite debris and dust.

[0075] Of course, the vertical lifting of the spherical fuel 1 can also be achieved by using a sliding friction method without installing a rolling body such as a ball on the baffle or the spiral blade 19.

[0076] In order to further optimize the above solution, the width of the spiral blade 19 is 0.8 times the diameter of the spherical fuel 1, and the angle between the spiral blade 19 and the horizontal plane is 30°, which can better protect the spherical fuel, reduce damage to the spherical fuel, and reduce debris.

[0077] In order to further optimize the above scheme, the root of the spiral blade 19 is higher than the blade edge. The blade surface used to support the spherical fuel can be an inclined plane, or an inclined convex surface, or an inclined concave surface.

[0078] The spherical fuel spiral reverse rotation vertical lifting device provided in an embodiment of the present invention is a design scheme of a spherical fuel spiral reverse rotation vertical lifting device, which is used in spherical fuel loading and unloading circulation systems, spent fuel unloading systems and new fuel injection systems in high-temperature gas-cooled reactor nuclear power plants or in similar application fields such as petrochemicals and electric power.

[0079] The spherical fuel spiral reverse rotating vertical lifting device provided in an embodiment of the present invention has a spiral shaft body, spiral blades 19 and bearings for fixing the spiral shaft placed in a high-temperature resistant, pressure-bearing and radioactive steel containment tube body 11, forming a closed fuel circulation environment and a reactor primary circuit pressure boundary, achieving high temperature, high pressure and radioactive containment.

[0080] The spherical fuel spiral reverse rotating vertical lifting device provided in the embodiment of the present invention is a design scheme of a spherical fuel spiral reverse rotating vertical lifting device with a simple structure, unlimited vertical lifting height, wider application range, better economy and higher reliability.

[0081] Moreover, in theory, the spiral vertical lifting height of the spherical fuel spiral reverse rotating vertical lifting device provided in the embodiment of the present invention is not limited, and the spiral type is left-handed or right-handed, that is, the spiral blade 19 is left-handed or right-handed.

[0082] The spherical fuel spiral reverse rotation vertical lifting device provided in an embodiment of the present invention relies on the reverse rotation of the spiral blades 19. The spherical fuel 1 at the low potential energy end of each spiral generates rolling friction with the spiral blades 19 to achieve vertical lifting and circulation transmission of the spherical fuel 1, which is used to rotate and vertically lift the spherical fuel 1 to the ball outlet end.

[0083] The spherical fuel spiral reverse rotation vertical lifting device provided by the embodiment of the present invention is used in the following manner:

[0084] The integral spiral blade 19 is divided into multiple stages from bottom to top, and the bottom one is called the first-stage spiral blade 8. After the spherical fuel 1 is discharged from the nuclear reactor pressure vessel 25 through the unloading device 26, it rolls into the spherical fuel unit 4 installed on the ball end connecting pipe 3 through the gravity-type passive slotted roller 2 on the downward pipeline under the action of gravity and stops rolling. When the unit ball taking groove 24 on the first-stage spiral blade 8 rotates through the spherical fuel unit 4, the spherical fuels 1 are discharged into the first-stage spiral blade 8 one by one, so that the individual spherical fuels 1 enter the first-stage spiral blade 8 in sequence at a certain interval.

[0085] After the spherical fuel 1 rolls in the first-stage spiral blade 8 to the low potential energy end of the spiral blade 19 of this stage, it is blocked by the fork-shaped wall plate 9 and cannot roll down along the spiral blade 19, wherein the baffle plate can also be called the fork-shaped wall plate 9. The fork-shaped wall plate 9 adopts a flat plate or a concave limiting device parallel to the outer edge of the spiral blade 19 to realize the vertical lifting of the spherical fuel 1.

[0086] The upper and lower ends of the shaft body 10 are fixed in the containing tube body 11 through horizontally installed solid lubricating bearings 14 and bearing seats 13.

[0087] The permanent magnet shielded motor as the driving device 18 provides a rotational driving force for the shaft body 10 to drive the spiral blades 19 to rotate. The permanent magnet shielded motor has the functions of low speed (5-200 rpm), high torque, static sealing, and maintenance-free.

[0088] When the shaft 10 drives the integral spiral blade 19 to reverse, rolling friction is formed between the spherical fuel 1 and the spiral blade 19 and the fork-shaped wall plate 9, thereby driving the spherical fuel 1 to be lifted vertically along the fork-shaped wall plate 9 pitch by pitch to the top of the fork-shaped wall plate 9, and then rolling out of the fork-shaped wall plate 9 from the discharge port and entering the downward sliding pipe.

[0089] Specifically, the fork-shaped wall panel 9 is smoothly connected with the ball outlet connecting pipe 12 located at the connection between the downward pipeline and the discharge port. The fork-shaped wall panel 9 is higher than the inner wall of the ball outlet connecting pipe 12. After the spherical fuel 1 rolls out from the uppermost end of the fork-shaped wall panel 9, it rolls into the ball outlet connecting pipe 12 by gravity.

[0090] The spherical fuel 1 rolls in the ball outlet connecting pipe 12, and rolls into the nuclear reactor pressure vessel 25 by gravity. After being discharged from the nuclear reactor pressure vessel 25 through the unloading device 26, it rolls into the ball outlet connecting pipe 3. The dust and debris generated during the rolling process pass through the grooved rolling track 2 on the downward pipeline, and are discharged through the debris removal orifice plate 7 and the debris removal pipe 5 in the containing tube body 11, thereby avoiding obstruction and realizing circular transmission.

[0091] Among them, the slotted raceway 2, the ball end connecting pipe 3, the containing tube body 11, the ball outlet end connecting pipe 12, the stator 15 of the permanent magnet shielded motor, the shielding cover 16 fastened on the driving device and the end cover 17 form a static seal to prevent the leakage of inert gas, such as helium, and contain nuclear radioactivity, thus forming a complete and pure pressure boundary of a circuit.

[0092] The distance between adjacent spiral blades 19 is greater than the diameter of the spherical fuel 1, that is, the spiral pitch is greater than the diameter of the spherical fuel 1, and the width of the spiral blade 19 is greater than the radius of the spherical fuel 1, preferably 0.8 times the diameter of the spherical fuel 1; the inclination angle of the spiral blade 19, that is, the angle with the horizontal plane is set to 0°-90°, and 30° is the best. This can better reduce the collision damage of the spherical fuel 1.

[0093] At the same time, the surfaces of the spiral blades 19 and the fork-shaped wall plate 9 are respectively installed with balls 23 and balls 20, so that the spherical fuel 1 generates rolling friction during the spiral reversal and vertical lifting process, thereby reducing the generation of graphite dust and debris.

[0094] The distance between the fork 22 of the fork-shaped wall plate 9 and the edge of the spiral blade 19 is 1 to 2 mm, but must be smaller than the radius of the ball.

[0095] The distance between the outer diameter surface of the shaft body 10 and the fork-shaped wall plate 9 is greater than the diameter of the spherical fuel 1 , and the surface of the spiral blade 19 is an inclined plane or slopes toward the adjacent inner wall of the containing tube body 11 .

[0096] The angle between the ball end axis and the ball outlet axis of the containing tube body 11 is any angle between 0° and 180°. The ball outlet and ball end of the containing tube body 11 are connected to the gravity-type passive slotted raceway 2 to achieve the in / out ball of the spherical fuel 1, the circulation transmission and the pressure boundary integrity.

[0097] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spherical fuel spiral reverse rotation vertical lifting device, It is characterized in that It includes a containing pipe body, a driving device, a shaft body, a spiral blade, a baffle and a descending pipe, wherein: The containing tube is filled with an inert gas. The shaft body is arranged vertically and rotatably built in the containing tube body, and the spiral blades are arranged on the outer wall of the shaft body in a surrounding manner along the axis direction of the shaft body. The baffle is vertically arranged on the inner wall of the containing tube body, the baffle is located between the outer wall of the spiral blade and the inner wall of the containing tube body, and there is a gap between the baffle and the outer wall of the spiral blade. The vertical spacing between adjacent spiral blades is greater than the diameter of the spherical fuel, the width of the spiral blade is greater than the radius of the spherical fuel and smaller than the diameter of the spherical fuel, and the distance between the outer wall of the shaft body and the inner wall of the containing tube body is greater than the diameter of the spherical fuel. The upper part of the containing tube body is provided with a discharge port, the lower part of the containing tube body is provided with a feed port, one end of the descending pipe is connected with the discharge port, and the other end of the descending pipe is connected with the feed port. The driving device is connected to the shaft body. The nuclear reactor pressure vessel is arranged on the descending pipe. The spherical fuel enters the containing tube body from the feed inlet and falls on the spiral blades. The driving device drives the spiral blades to rotate through the shaft. The spiral blades drive the spherical fuel to rise upward along the baffle until the discharge port. The spherical fuel enters the descending pipe from the discharge port and slides down to the nuclear reactor pressure vessel under the action of gravity. The spherical fuel discharged from the nuclear reactor pressure vessel slides down to the feed inlet for cyclic transmission.

2. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that A spherical fuel unit for stopping the rolling of the spherical fuel is provided at the connection between the descending pipeline and the feed inlet. The spiral blade is provided with a single-vessel ball taking groove for taking the spherical fuels out of the spherical fuel single vessel one at a time.

3. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The driving device is a permanent magnet shielded motor, the driving device is arranged outside the containing tube body, and the driving device has no contact with the shaft body.

4. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The bottom of a section of the pipeline where the downward-sliding pipeline is connected to the feed inlet is grooved, and a collecting device is arranged below the groove.

5. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The bottom of the containing tube body is provided with an exclusion orifice plate. One end of the shaft is rotatably disposed on the exclusion orifice plate. A discharge pipe is arranged below the discharge orifice plate.

6. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The angle between the spiral blade and the horizontal plane is ≥0° to less than 90°.

7. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that A rolling body is arranged on the blade surface of the spiral blade supporting the spherical fuel.

8. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The baffle is an L-shaped baffle, Rolling bodies are arranged on both surfaces of the baffle plate in contact with the spherical fuel.

9. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The width of the spiral blade is 0.8 times the diameter of the spherical fuel. The included angle between the spiral blade and the horizontal plane is 30°.

10. The spherical fuel spiral reverse rotation vertical lifting device according to claim 1, It is characterized in that The root of the spiral blade is higher than the edge of the blade.

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