CN211207985U

CN211207985U - Waterwheel chain box type vertical fuel conveying device

Info

Publication number: CN211207985U
Application number: CN201921785949.1U
Authority: CN
Inventors: 孟东旺
Original assignee: CHINERGY CO LTD
Current assignee: CHINERGY CO LTD
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-08-07
Anticipated expiration: 2029-10-23

Abstract

The utility model provides a perpendicular conveyor of waterwheel chain case formula fuel, the device's mechanical transmission part is arranged in and is contained internally, and it is external that drive assembly arranges in and contains, and it is connected with the fluting raceway respectively to contain the body upper and lower end. The mechanical transmission component comprises a driving wheel, a driven wheel, a driving chain and a plurality of chain boxes which are fixed on the driving chain and used for accommodating spherical nuclear fuel elements; the driving wheel is driven by the driving component and drives the driven ratchet wheel to rotate through the driving chain; each chain case is a case body with an opening end, a centering guide plate used for ensuring that the spherical nuclear fuel elements are positioned in the center of the chain case is arranged in the case body, and the side wall of the opening end of the case body, which is in contact with the driving chain, extends outwards to form a guide plate used for guiding the spherical nuclear fuel elements into the chain case or providing a rolling distance to enable the spherical nuclear fuel elements to enter the grooved roller path; the engagement between the driving chain and the transmission ratchet wheel is ensured through the deviation correcting piece fixed on the inner side wall of the containing body. The device has reliable operation, simple structure and high economical efficiency.

Description

Waterwheel chain box type vertical fuel conveying device

Technical Field

The utility model relates to a perpendicular conveyor of waterwheel chain case formula fuel for the spherical nuclear fuel component of high temperature gas cooled reactor nuclear power station loads and unloads circulation system, spentnuclear fuel and unloads system and new fuel injection system or similar application such as petrochemical industry, electric power, belongs to transmission technology field.

Background

The loading and unloading circulation of the spherical nuclear fuel element of the high-temperature gas cooled reactor nuclear power station needs to rely on a helium compressor to provide a pneumatic transmission power source required by the lifting of the spherical nuclear fuel element, under the normal working condition, the spherical nuclear fuel element carries out reactor core main circulation, spent fuel discharging and new fuel injection through helium pneumatic transmission, and in the pneumatic circulation transmission process, the spherical nuclear fuel element continuously rubs and collides with the inner wall of a pipeline and equipment such as a discharging device, a ball crushing separation device, a fuel consumption measurement device, a bridge connector and the like.

At present, the device for realizing the loading, unloading, circulating and conveying of spherical nuclear fuel elements by the pneumatic conveying power source mainly has the following defects:

the method has the following disadvantages: the spherical nuclear fuel element loading and unloading circulation adopts helium pneumatic transmission. Under normal working conditions, the spherical nuclear fuel element needs to rely on a helium compressor to provide a pneumatic transmission power source required for lifting in the pneumatic circulating transmission process, and the insufficient reliability of the helium compressor causes the spherical nuclear fuel element to lose the power source in a circulating way, so that the reactor is passively stopped; meanwhile, in the process of pneumatic circulating transmission, the requirements on the inner diameter of a pneumatic transmission pipeline and the protrusion and the depression of the inner wall of the welding seam of the pipeline are high, the spherical nuclear fuel element continuously rubs and collides with the pipeline wall, and the generated fuel dust and scraps often cause the blockage accident of the spherical nuclear fuel element, so that the spherical nuclear fuel element cannot be transmitted and circulated to cause the passive shutdown of a reactor; the quantity of spherical nuclear fuel elements and the size deviation of fuel balls in the pneumatic conveying pipeline have different requirements on pneumatic conveying pressure parameters, so that the detention and the oscillation of the spherical nuclear fuel elements in the pipeline are aggravated, the blockage of the spherical nuclear fuel elements is caused, and the system is unstable in operation.

The second disadvantage is that: under the working condition of blockage accidents of the spherical nuclear fuel element, in high-temperature, high-pressure and high-radioactivity environments and complex pipeline environments, the blockage points of the spherical nuclear fuel element are found to be difficult to check, part of blockage point maintenance personnel and maintenance tools cannot reach, and the blockage accidents of the spherical nuclear fuel element are eliminated, so that radioactivity leakage is easily caused.

In order to overcome the disadvantages of the above-mentioned conveying device, the applicant has proposed an escalator-type fuel conveying device (application No. 201910471958.1), which uses a multi-stage escalator-type fuel conveying device to engage with a grooved raceway to realize the loading and unloading cycle of spherical nuclear fuel elements, spent fuel discharge and new spherical nuclear fuel element injection according to the requirements of the radiation zone and the fire zone of a nuclear power plant, wherein the mechanical transmission part comprises a transmission ratchet wheel, a driving chain fixed on the transmission ratchet wheel, and a plurality of steps fixed on the driving chain. However, in the engineering implementation process, the escalator type fuel transmission device needs to keep a certain included angle (generally less than 45 degrees) with the horizontal plane, and needs to occupy larger building area and space, so that the building cost is high; the spherical nuclear fuel element adopts a multi-section escalator type fuel transmission device and a slotted roller path to realize continuous transmission, and the equipment has high manufacturing and installation precision and high cost; the escalator-type fuel conveying device is complex in equipment and has certain difficulty in maintenance.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve foretell various problems, provided a simple structure, vertical lifting height do not limit, application scope is wider, economic nature is better, the higher perpendicular conveyor of waterwheel chain box fuel of reliability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a waterwheel chain-box type fuel vertical conveying device comprises a sealed containing body containing helium, a mechanical transmission part positioned in the containing body and a driving assembly positioned outside the containing body; the upper end and the lower end of the containing body are respectively communicated with the gravity type passive slotted roller path to form a loop, the bottom of the slotted roller path is provided with a dust conveying pipe for collecting dust and scraps falling through the slotted roller path, and the tail end of the dust conveying pipe is communicated with a dust collecting device; it is characterized in that the preparation method is characterized in that,

the mechanical transmission component comprises a driving wheel and a driven wheel which are positioned at the top and the bottom of the containing body, a driving chain fixed between the driving wheel and the driven wheel, and a plurality of chain boxes which are fixed on the driving chain and are arranged at equal intervals and used for containing spherical nuclear fuel elements; the driving wheel is sleeved on the first transmission shaft, one end of the transmission shaft is positioned in the containing body and is fixed on the inner side wall of the containing body through a first bearing and a bearing end cover, the other end of the transmission shaft is positioned outside the containing body and is connected with the output end of the driving assembly, the driven wheel is sleeved on the second transmission shaft, and two ends of the transmission shaft are fixed on the inner side wall of the containing body through a matched bearing and a bearing end cover; each chain case has the same structure and is a case body with an opening end, a centering guide plate used for ensuring that the spherical nuclear fuel element is positioned at the center of the chain case is arranged in the case body, and the side wall of the opening end of the case body, which is contacted with the driving chain, extends outwards to form a guide plate used for guiding the spherical nuclear fuel element into the chain case or providing a rolling distance to enable the spherical nuclear fuel element to enter the grooved raceway; the engagement between the driving chain and the driving wheel is ensured through the deviation rectifying part fixed on the inner side wall of the containing body.

Furthermore, the deviation correcting piece is a U-shaped block body which forms an envelope for the driving chain, and is integrated or segmented; and a plurality of balls with solid lubrication action are uniformly distributed on the inner side wall of the deviation rectifying part and are in contact with the driving chain.

Furthermore, the surfaces of the centering guide plate and the guide plate in the chain case, which are contacted with the spherical nuclear fuel element, are arc surfaces with a flow guide direction.

Furthermore, an automatic tensioning piece (21) is arranged between the bearing end covers at the two ends of the second transmission shaft and the inner side wall of the containing body and used for ensuring that the driving chain is always in a tensioning state; the automatic tensioning piece comprises a support frame fixed on the inner side wall of the containing body, a plurality of foldable limiting bodies axially parallel to the driving chain are fixed on the side wall of the support frame opposite to the bearing end cover of the second transmission shaft and used for preventing the bearing end cover of the second transmission shaft from moving towards the direction which enables the driving chain to tend to loose, the limiting bodies shielded by the bearing end cover of the second transmission shaft are in a folded state, and the limiting bodies not shielded by the bearing end cover are in an opened state; and a bolt fixedly connected with the bottom of the bearing end cover of the second transmission shaft is arranged at the bottom of the support frame, and a limiting spring is sleeved on the bolt.

The utility model discloses characteristics and beneficial effect:

the utility model provides a waterwheel chain case formula fuel vertical transport device, its transmission principle is similar to the ancient agricultural irrigation instrument-waterwheel of china. The mechanical transmission part of the conveying device is arranged in helium atmosphere of a high-temperature, high-pressure and high-radioactivity containing body, and the driving motor and the permanent magnet coupler are arranged outside the containing body. The moment of torsion of driving motor passes through permanent magnet coupling input and gives the transmission ratchet and drive the driving chain circulation transmission, and the drive wheel is fixed at the inclusion body inner wall through oil-free lubrication bearing and bearing housing, and the moment of torsion of drive wheel relies on permanent magnet input, avoids moment of torsion input to cause the inclusion body trompil, prevents that a return circuit helium from revealing and radioactive escape. The ball inlet end and the ball outlet end of the fuel vertical conveying device are connected with the slotted roller path, and fuel dust and debris flow into the dust collecting device through the slotted roller path. The centering guide plate in the chain case of the waterwheel chain case type fuel vertical conveying device ensures that the spherical fuel element is in the center position of the chain case, and prevents the chain case from being deviated from the center to cause the deviation of a driving chain. The guide plate on the chain box can prevent the spherical fuel element from being clamped between the driving chains and preventing the spherical fuel element from being collided with the driving chains, so that the driving chains are prevented from being deviated due to the impact force of the spherical fuel element on the driving chains, and the spherical fuel element is prevented from being damaged due to fragments generated by collision. After the fuel vertical conveying device discharges the spherical fuel elements, the spherical fuel elements are continuously conveyed through the gravity type slotted roller path, so that the circular conveying, injection and discharge of the spherical fuel elements are realized. The driving chain of the fuel vertical conveying device realizes the reliable transmission of the driving force of the driving chain and the ratchet wheel through the deviation rectifying part, the driving chain is ensured not to deviate, and the theoretical lifting height is not limited. The automatic tensioning piece can realize the fastening of the driving chain when the driving chain is loosened, and the stable transmission of the torque of the driving wheel and the driving chain is ensured.

In summary, compared with a pneumatic conveying device and an automatic escalator type fuel conveying device, the vertical conveying device for water wheel chain box type fuel has the advantages of small occupied area, no fault point, reliable operation, simple system equipment and pipeline arrangement, flexible and convenient combination with other functional equipment (a discharging device, a ball breaking separating device, a fuel consumption measuring device and a feeding device) and high economical efficiency.

Drawings

Fig. 1 is a schematic overall structure diagram of a waterwheel chain box type fuel vertical conveying device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1.

Fig. 3(a) to (c) are a front view, a left side view and a top view, respectively, of the chain case structure shown in fig. 1.

FIGS. 4(a) - (d) are front, top, left and C-C sectional views, respectively, of the corrector structure shown in FIG. 1.

Fig. 5 is an enlarged view of a portion of the tension member shown in fig. 1 connected to the bearing block, the second drive shaft, and the bearing.

Fig. 6(a) - (c) are front, left and top views, respectively, of the tension member structure shown in fig. 5.

Fig. 7 is a schematic structural view of the grooved raceway and the slits thereon shown in fig. 1.

FIG. 8 is a diagram illustrating an application of the apparatus shown in FIG. 1 in a high temperature gas cooled reactor nuclear power plant.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, it is a schematic diagram of an overall structure of a waterwheel chain box type fuel vertical conveying device according to an embodiment of the present invention, which is used in a high temperature gas cooled reactor nuclear power plant. The fuel vertical conveying device of the embodiment comprises a sealed containing body 7 containing helium, a mechanical transmission part 5 positioned in the containing body 7 and a driving component positioned outside the containing body 7; the upper end and the lower end of the containing body 7 are respectively communicated with the gravity type passive slotted

roller paths

11 and 2 to form a loop, the bottoms of the slotted

roller paths

2 and 11 are provided with dust conveying pipes 3 for collecting dust and debris falling through the slotted roller paths, and the tail ends of the dust conveying pipes 3 are communicated with a dust collecting device 4; the mechanical transmission part 5 comprises a driving wheel 101 and a driven wheel 102 which are positioned at the top and the bottom of the containing body 7, a driving chain 9 fixed between the driving wheel 101 and the driven wheel 102, and a plurality of chain boxes 6 which are fixed on the driving chain 9 and are arranged at equal intervals and used for containing the spherical nuclear fuel elements 1; referring to fig. 2, the driving wheel 101 is sleeved on the first transmission shaft 16, one end of the transmission shaft 16 is located in the containing body 7 and is fixed on the inner side wall of the containing body 7 through the first bearing 19 and the bearing end cover 20, the other end of the transmission shaft 16 is located outside the containing body 7 and is connected with the output end of the driving assembly, the driven wheel 102 is sleeved on the second transmission shaft 23, and the two ends of the transmission shaft 23 are fixed on the inner side wall of the containing body 7 through the matched bearing 24 and the bearing end cover 23; referring to fig. 3(a) - (c), each chain case 6 has the same structure, and is a case body with an open end, the case body is provided with a centering guide plate 25 for ensuring that the spherical nuclear fuel elements 1 are located at the center of the chain case 6, and the side wall of the open end of the case body, which is in contact with the driving chain 9, extends outwards to form a guide plate 26 for guiding the spherical nuclear fuel elements 1 into the chain case 6 or providing a rolling distance to make the spherical nuclear fuel elements 1 enter the grooved raceway 11; the engagement between the drive chain 9 and the drive wheels (101, 102) is ensured by a deviation-correcting member 8 fixed to the inner side wall of the containing body 7.

The specific implementation modes and functions of the components in this embodiment are as follows:

the containing body 7 is made of materials for containing high temperature, high pressure and high radioactivity, and comprises ceramic, carbon fiber, steel or other composite materials, and helium atmosphere is contained in the containing body. The lower part and the upper part of the containing body 7 are respectively provided with a ball inlet end and a ball outlet end which are communicated with the gravity type passive

grooved roller paths

2 and 11 and are used for feeding and discharging the spherical nuclear fuel elements 1. When the containing body is installed, any included angle of 0-90 degrees (inclusive) is formed between the containing body and the installation reference surface, and 90-degree vertical installation is adopted in the embodiment. It should be noted that, for the scenario where the installation area is not limited, non-vertical installation may be selected, and particularly, when the axis of the containing body is parallel to the installation reference plane (i.e. the included angle between the axis and the installation reference plane is 0 °), a limiting groove needs to be provided in the middle of the flow guide plate 26 of each chain case 6 to prevent the spherical nuclear fuel elements 1 from rolling out of the chain case when being located between the ball inlet end and the ball outlet end of the containing body 7.

Referring to fig. 2, mechanical transmission members 5 are used to realize the circulation transfer of the spherical nuclear fuel elements 1. The central connecting line of the driving wheel 101 and the driven wheel 102 coincides with the central axis of the containing body 7, the driving wheel 101 and the driven wheel 102 can adopt a ratchet wheel or a gear to drive the driving chain 9, and the driving wheel 101 and the driven wheel 102 of the embodiment adopt ratchet wheel drive. The driving wheel 101 is provided with torque by a driving assembly positioned outside the containing body 7, the driving assembly of the embodiment comprises a driving motor 12, a coupler and a magnetic driver which are sequentially connected, the magnetic driver adopts a cylindrical magnetic driver and comprises an outer magnetic rotor 13, an inner magnetic rotor 15 and a non-magnetic isolating sleeve 14, non-contact and non-leakage torque transmission can be realized through the magnetic driver, wherein the outer magnetic rotor 13 is connected with an output shaft of the driving motor 12 through the coupler, the end parts of the outer magnetic rotor 13 and the inner magnetic rotor 15 are respectively connected with the outer side wall of the containing body 7 through oil-

free lubricating bearings

18 and 17, the inner magnetic rotor 15 is connected with one end of a first driving shaft 16 through the oil-free lubricating bearing, the other end of the first driving shaft 16 is fixed on the inner side wall of the containing body 7 through the oil-free lubricating bearing 19 and a matched bearing end cover 20, the driving wheel 101 is, thereby realizing that the driving assembly drives the driving wheel 101 to rotate through the first transmission shaft 16, and the isolation sleeve 14 is positioned between the inner magnetic rotor and the outer magnetic rotor and is connected with the flange of the containing body 7 in a welding way. The driving wheel 101 rotates the driven wheel 102 via the driving chain 9. In addition, the torque of the driving ratchet 101 can be input by a transmission shaft mode when radioactive media do not exist and the torque can be realized through mechanical sealing. The driving chain 9 between the driving wheel 101 and the driven wheel 102 can be a chain, a plate chain (the number of the chain and the plate chain can be single, double or multiple) or a driving belt, and the plate chain structure is adopted in the embodiment.

Referring to fig. 3, the chain cases 6 spaced apart from each other on the driving chain 9 are used to accommodate spherical nuclear fuel elements 1, and the spacing between two adjacent chain cases 6 should be larger than the spherical diameter of one spherical nuclear fuel element 1, so as to ensure that the spherical nuclear fuel elements 1 are not caught by the adjacent chain cases 6 when entering the containing body 7. The chain case 6 can be a cube, a cuboid or other irregular geometric shapes (the cube is adopted in the embodiment) with outline conforming to the specification of JB/T3926-2014 vertical bucket elevator (P17-23), and has an open end, the opening directions of the chain cases 6 positioned on the same side of the driving chain 9 are consistent, and the distance between the inner side wall of the containing body 7 and the side wall of the chain case 6 should meet the requirements of the maximum turning radius and the installation distance of the chain case at the driving wheel 101 and the driven wheel 102. A connecting lug 27 is provided on a side wall of the chain case 6 in contact with the drive chain 9, and the chain case 6 and the drive chain 9 are fixed by the connecting lug 27. The surfaces of the centering guide plates 25 and the guide plates 26 in the chain case 6, which are in contact with the spherical nuclear fuel elements 1, are both provided with arc-shaped surfaces with flow guiding directions. Wherein the centering guide plate 25 secures the spherical nuclear fuel elements 1 in the central position of the chain case 6, preventing the chain case 6 from being off-centered to cause the drive chain 9 to be off-track. The baffle plate 26 prevents the spherical nuclear fuel elements 1 from being stuck between the drive chains 9 and from colliding with the drive chains 9, prevents the driving chains 9 from being deviated by the impact force of the spherical nuclear fuel elements 1 against the drive chains 9, and prevents the spherical nuclear fuel elements 1 from being damaged by debris generated by the collision. When the chain case 6 loaded with the spherical nuclear fuel elements 1 is transferred to the highest potential energy point and starts to be transferred downward, the guide plates 26 on the chain case 6 can provide enough rolling distance for the spherical nuclear fuel elements 1, so that the spherical nuclear fuel elements 1 can be guided and discharged after obtaining a certain speed.

Referring to fig. 4(a) - (d), the deviation rectifying member 8 is in an integral type or a sectional type, and is used for realizing reliable transmission of driving forces of the driving wheel (101, 102) and the driving chain 9, so that the driving chain 9 is not deviated from the driving wheel, and the theoretical lifting height is not limited. The correcting element 8 of the embodiment adopts a sectional type and comprises a plurality of U-shaped blocks which are arranged at equal intervals and form an envelope for the driving chain 9; a plurality of balls 30 with solid lubrication action are uniformly distributed on the inner side wall of each U-shaped block body and are contacted with the driving chain 9. The friction between the U-shaped block and the driving chain 9 can be reduced by the arranged balls 30, the service life of the driving chain 9 and the efficient meshing between the driving chain 9 and the transmission ratchet wheels (101 and 102) are guaranteed, deviation does not occur, the reliability is high, the rolling shafts of the driving chain 9 and the balls 30 on the deviation rectifying part 8 can be made of high-temperature-resistant and irradiation-resistant oil-free lubrication ceramics or alloy steel, and the purity of a nuclear reactor loop pressure boundary is guaranteed.

Referring to fig. 5 and 6(a) to (c), in the operating state of the present conveyor, the drive chain 9 may be loosened due to wear. In order to avoid the drive chain 9 from being in a loose state and ensure the stable transmission of the torque between the driving wheel and the drive chain 9, the fuel vertical conveying device comprises an automatic tensioning member 21 fixed between a bearing end cover 22 of a second transmission shaft 23 and the inner side wall of the containing body 7. The automatic tensioning piece 21 comprises a support frame 211 fixed on the inner side wall of the containing body 7, a plurality of foldable limiting bodies 32 axially parallel to the driving chain 9 are fixed on the side wall of the support frame opposite to the bearing end cover 22, the limiting bodies shielded by the bearing end cover 22 are in a folded state, and the limiting bodies not shielded by the bearing end cover 22 are in an opened state; when the driving chain 9 is tensioned and the top of the bearing end cover 22 passes through the foldable limiting body 32, the foldable limiting body 32 is opened to prevent the bearing end cover 22 from moving towards the direction (upward when the containing body is in a vertical state) which makes the driving chain 9 tend to be loose, and the foldable limiting body 32 which does not exceed the top of the bearing shell is in a semi-closed state; the bottom of the support frame 211 is provided with a bolt fixedly connected with the bottom of the bearing end cover 22, the bolt is sleeved with a limiting spring 33, the diameter of the limiting spring 33 is larger than that of a bolt hole formed in the bottom of the support frame 211, the limiting spring 33 is always located between the bottom of the support frame 211 and a gasket of the bolt, the limiting spring 33 is pressed through a fastening bolt, and the elastic force of the limiting spring 33 can tighten the driving chain 9.

Referring to fig. 7, slits are opened at the bottom of each grooved roller path, taking the grooved roller path 2 as an example, dust and debris generated when the spherical nuclear fuel element 1 rolls in the grooved roller path 2 fall into the dust conveying pipe 3 below the grooved roller path through the slits 34 of the grooved roller path 2, and finally are collected and discharged by the dust collecting device 4, so that the spherical nuclear fuel element 1 is prevented from rolling in the grooved roller path 2 due to accumulation of the dust and debris. The slotted roller path 2 can adopt any one or a plurality of combination forms of a linear type, a spiral line type, a bending type and a loop type, the slotted roller path 2 is installed by adopting any inclination angle between the horizontal direction and the vertical direction, and the angle between the axis of the slit 34 and the axis of the slotted roller path 2 is any angle of 0-90 degrees.

In practical application, the utility model discloses a perpendicular conveyor of waterwheel chain case formula fuel can with the nimble combination of nuclear power station existing equipment such as nuclear fuel discharge apparatus, ball-crushing separator, burn up measuring device, feed arrangement, realize the spherical nuclear fuel component loading and unloading circulation function of nuclear power station nuclear reactor, transmission efficiency is high, the good reliability, the application example is seen in figure 8.

In the embodiment of the present application,

the nuclear reactor pressure vessel 39 with the spherical nuclear fuel element 1 is connected with the ball inlet end of the gravity type passive slotted roller path 2 through a discharging device 40, meanwhile, the ball inlet end of the slotted roller path 2 is also provided with a ball breaking separation device 41, the ball outlet end of the slotted roller path 2 is connected with the ball inlet end of the water wheel chain box type fuel vertical conveying device, the ball outlet end of the water wheel chain box type fuel vertical conveying device is connected with the ball inlet end of the slotted roller path 11, the slotted pipe 11 is provided with a nuclear fuel consumption measuring and distributing device 36, the nuclear fuel element 1 meeting the measuring requirement is continuously transmitted in the slotted pipe 11, the nuclear fuel element 1 not meeting the measuring requirement is discharged from the slotted pipe 11 and enters a spent fuel discharging device 35, and the slotted pipe 11 is also communicated with a new fuel injection device 37.

The transfer process of the spherical nuclear fuel element 1 in the above application example is as follows:

after being discharged from a nuclear reactor pressure vessel 39 through a discharging device 40, the spherical nuclear fuel elements 1 roll to a chain box 6 at the lower end part of a mechanical transmission part 5 in a containing body 7 of a chain box type vertical transmission device through a grooved roller path 2 under the action of gravity, the spherical nuclear fuel elements 1 roll to the central position of the bottom of the chain box through a centering guide plate 25 arranged on the chain box 6, dust and debris generated when the spherical nuclear fuel elements 1 roll in the grooved roller path 2 fall into a dust conveying pipe 3 through a slit 34 of the grooved roller path 2, finally are collected and discharged by a dust collecting device 4, the spherical nuclear fuel elements 1 are prevented from being influenced by accumulation of the dust and the debris to roll in the grooved roller path 2, and the spherical nuclear fuel elements 1 are injected into the chain box 6 in a single row (one by one row) through continuous transmission of the grooved roller path. The chain case 6 on the mechanical transmission part 5 in the chain case type vertical transmission device transmits the spherical nuclear fuel elements 1 to the upper end part of the grooved rolling way 11 through the transmission of the transmission wheels (101, 102) along with the driving chain 9, when the spherical nuclear fuel elements 1 roll in the grooved rolling way 11 through the action of gravity, the burnup of the spherical nuclear fuel elements 1 is measured through the nuclear burnup measuring and distributing device 36, the spherical nuclear fuel elements 1 which are larger than the preset burnup measured value continue to roll in the grooved rolling way 11 and enter the nuclear reactor pressure container 39, the spherical nuclear fuel elements 1 which are deeply burnt are sent to the spent fuel discharging device 35, and simultaneously, the new fuel is injected by the new fuel injection device 37 and is sent into the nuclear reactor pressure container 39 through the grooved rolling way 11, thereby realizing the circular transmission of the fuel.

Transport process of spherical nuclear fuel element 1 within containment body 7:

when the spherical nuclear fuel elements 1 are rolled to the lower end part of the mechanical transmission member 5 through the grooved rolling path 2 and are continuously transported, the spherical nuclear fuel elements 1 obtain a certain speed to hit the chain case 6 or a gap between two adjacent chain cases 6. When the spherical nuclear fuel elements 1 impact the outer wall of the chain case 6, the speed of the spherical nuclear fuel elements 1 is zero, the chain case 6 continues to circularly operate upwards under the driving of the driving chain 9, but the spherical nuclear fuel elements 1 roll under the action of gravity and roll into the chain case 6 through the centering guide plate 25; when the spherical nuclear fuel elements 1 hit the gap between the adjacent two chain cases 6 from a certain speed, the baffle plates 26 installed on the chain cases 6 block the spherical nuclear fuel elements 1 from hitting the driving chain 9, and guide the spherical nuclear fuel elements 1 into the chain cases 6 through the baffle plates 26. When the spherical nuclear fuel element 1 is conveyed to the highest gravitational potential energy end of the mechanical transmission part 5 through the chain case 6, the chain case 6 is still in circulating operation under the driving of the driving chain 9, and the spherical nuclear fuel element 1 rolls in the chain case 6 at the highest gravitational potential energy end, obtains relatively higher rolling speed through the guide plate 26 and rolls to the upper end part (ball inlet end) of the grooved raceway 11.

The above examples are only for illustrating the present invention and are not intended to limit the present invention. According to the technical principle of the utility model, the ordinary technical personnel can have multiple deformation design to a waterwheel chain case formula fuel vertical transportation device's design. The protection scope of the present invention should be defined by the claims.

Claims

1. A waterwheel chain box type fuel vertical conveying device comprises a sealed containing body (7) containing helium, a mechanical transmission part (5) positioned in the containing body (7), and a driving assembly positioned outside the containing body (7); the upper end and the lower end of the containing body (7) are respectively communicated with the gravity type passive slotted roller paths (11, 2) to form a loop, the bottoms of the slotted roller paths (11, 2) are provided with dust conveying pipes (3) used for collecting dust and debris falling through the slotted roller paths, and the tail ends of the dust conveying pipes are communicated with a dust collecting device (4); it is characterized in that the preparation method is characterized in that,

the mechanical transmission component (5) comprises a driving wheel (101) and a driven wheel (102) which are positioned at the top and the bottom of the containing body (7), a driving chain (9) fixed between the driving wheel (101) and the driven wheel (102), and a plurality of chain boxes (6) which are fixed on the driving chain (9) and are arranged at equal intervals and used for containing spherical nuclear fuel elements (1); the driving wheel (101) is sleeved on a first transmission shaft (16), one end of the first transmission shaft (16) is positioned in the containing body (7) and is fixed on the inner side wall of the containing body (7) through a first bearing (19) and a bearing end cover (20), the other end of the first transmission shaft (16) is positioned outside the containing body (7) and is connected with the output end of the driving assembly, the driven wheel (102) is sleeved on a second transmission shaft (23), and two ends of the second transmission shaft (23) are fixed on the inner side wall of the containing body (7) through matched bearings and bearing end covers; each chain case (6) has the same structure and is a case body with an opening end, a centering guide plate (25) used for ensuring that the spherical nuclear fuel elements (1) are positioned at the center of the chain case (6) is arranged in the case body, and the side wall of the opening end of the case body, which is contacted with the driving chain (9), extends outwards to form a guide plate (26) used for guiding the spherical nuclear fuel elements (1) into the chain case (6) or providing a rolling distance to enable the spherical nuclear fuel elements (1) to enter the grooved roller path (11); the engagement between the driving chain (9) and the driving wheels (101, 102) is ensured by a deviation correcting piece (8) fixed on the inner side wall of the containing body (7).

2. The vertical fuel transfer arrangement according to claim 1, characterized in that the deviation correcting member (8) is a U-shaped block enveloping the drive chain (9), in one piece or in segments; a plurality of balls (30) with solid lubrication action are uniformly distributed on the inner side wall of the deviation rectifying piece (8) and are in contact with the driving chain (9).

3. The vertical fuel transfer device according to claim 1, characterized in that the surfaces of the centering guide plates (25) and the guide plates (26) in the chain case (6) which contact the spherical nuclear fuel elements (1) are both arc-shaped surfaces with a flow guiding direction.

4. The vertical fuel transfer arrangement according to claim 1, characterized in that the drive chain (9) is an endless chain, a plate chain or a drive belt.

5. The vertical fuel transfer device according to claim 1, wherein the driving wheel (101) and the driven wheel (102) are ratchet wheels or gears.

6. The vertical fuel transfer arrangement of claim 1, wherein the torque provided by the drive assembly to the drive wheel (101) is input by means of permanent magnet or a propeller shaft.

7. The vertical fuel transfer device of claim 1, wherein each of the bearings is an oil-free bearing.

8. The vertical fuel conveying device according to any one of claims 1-7, characterized in that an automatic tensioning member (21) is arranged between the bearing end covers at the two ends of the second transmission shaft (23) and the inner side wall of the containing body (7) for ensuring that the driving chain (9) is always in a tensioned state; the automatic tensioning piece (21) comprises a support frame (211) fixed on the inner side wall of the containing body (7), a plurality of foldable limiting bodies (32) which are axially parallel to the driving chain (9) are fixed on the side wall of the support frame opposite to the bearing end cover of the second transmission shaft (23) and used for preventing the bearing end cover of the second transmission shaft (23) from moving towards the direction which enables the driving chain (9) to tend to be loose, the limiting bodies shielded by the bearing end cover of the second transmission shaft (23) are in a folded state, and the limiting bodies not shielded by the bearing end cover are in an opened state; and a bolt fixedly connected with the bottom of the bearing end cover of the second transmission shaft (23) is arranged at the bottom of the support frame (211), and a limiting spring (33) is sleeved on the bolt.