A centering adjustable device

Abstract

A centering adjustable device is suitable for adjusting the centering position of the upper and lower in-core components of a nuclear power plant. The centering adjustable device comprises a raised seat, an intermediate seat, a retaining ring, an adjustment mechanism, and a radially arranged adjustment member which are axially connected in sequence, wherein the retaining ring comprises an axially arranged first cavity and at least one side hole vertically penetrating the side wall of the retaining ring, and the adjustment mechanism is accommodated in the first cavity; the adjustment mechanism comprises a first ring, an adjustment seat, and a second ring which are axially arranged in sequence, and the adjustment seat comprises a plurality of circumferentially arranged through holes and a rotating member arranged in the through holes; the adjustment member passes through the side hole and is used to adjust the adjustment seat and the second ring; the raised seat, the intermediate seat, the first ring, the adjustment seat and the second ring cooperate in sequence and are used to support the upper and lower in-core components.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactors, and in particular to an adjustable centering device for upper and lower nuclear power reactor internals. Background Art

[0002] When the upper and lower internals of a nuclear power reactor are assembled and aligned at a manufacturer, an adjustment device simulating a compression spring needs to be provided between the flanges of the two components to adjust their relative positions to achieve alignment.

[0003] Therefore, when the upper internal components of a nuclear power plant are aligned and assembled with the lower internal components of the nuclear power plant, an adjustable centering device is required. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problem and to provide an adjustable centering device, which is provided with a raising seat, an intermediate seat and a retaining ring which are connected in sequence, an adjusting mechanism and an adjusting part are provided in the retaining ring, and the rotation of the adjusting seat of the adjusting mechanism and the positioning and clamping of the adjusting seat by the adjusting part are utilized to realize the centering adjustment during the centering assembly process of the upper and lower internal components of the nuclear power plant.

[0005] To achieve the above object, the present invention adopts the following technical solutions.

[0006] A centering adjustable device is suitable for adjusting the centering position of the upper and lower in-core components of a nuclear power plant. The centering adjustable device comprises a raised seat, an intermediate seat, a retaining ring, an adjustment mechanism, and a radially arranged adjustment member which are axially connected in sequence, wherein the retaining ring comprises an axially arranged first cavity and at least one side hole vertically penetrating the side wall of the retaining ring, and the adjustment mechanism is accommodated in the first cavity; the adjustment mechanism comprises a first ring, an adjustment seat, and a second ring which are axially arranged in sequence, and the adjustment seat comprises a plurality of circumferentially arranged through holes and a rotating member arranged in the through holes; the adjustment member passes through the side hole and is used to adjust the adjustment seat and the second ring; the raised seat, the intermediate seat, the first ring, the adjustment seat and the second ring cooperate in sequence and are used to support the upper and lower in-core components.

[0007] Furthermore, the raising seat, the middle seat, the retaining ring, the first ring, the adjusting seat and the second ring respectively have at least one pair of equal height surfaces along the axial direction.

[0008] Furthermore, the intermediate seat includes a first end and a second end, the first end is axially connected to the raised seat, and the connection method is a detachable connection; the retaining ring includes a connecting end and a free end, the connecting end is axially engaged and connected to the second end of the intermediate seat, and the connection method is a detachable connection.

[0009] Furthermore, the cushioning seat is threadedly connected to the first end of the intermediate seat, wherein the cushioning seat is axially evenly provided with a plurality of first threaded through holes and a plurality of first countersunk holes, the first countersunk holes are coaxial and connected with the first threaded through holes, and the first countersunk holes are arranged at the end of the cushioning seat away from the intermediate seat, the inner diameter of the first countersunk hole is larger than the inner diameter of the first threaded through hole, and the first end of the intermediate seat is provided with a first threaded hole at the fitting position, and the first threaded hole is connected to the first threaded through hole by screws.

[0010] Furthermore, the second end of the intermediate seat includes a connecting surface, a bearing surface, and a step arranged between the bearing surface and the connecting surface, wherein the connecting end of the retaining ring abuts against the connecting surface and the step of the intermediate seat, and the inner wall of the retaining ring and the bearing surface of the second end form the first cavity.

[0011] Furthermore, a plurality of second threaded through holes and a plurality of second countersunk holes are evenly arranged axially on the retaining ring, the second countersunk holes are coaxial with and connected to the second threaded through holes, the second countersunk holes are arranged at the free end of the retaining ring, the inner diameter of the second countersunk holes is larger than the inner diameter of the second threaded through holes, and the connecting surface of the intermediate seat is provided with a second threaded hole at the mating position, and the second threaded hole is connected to the second threaded through hole by screws.

[0012] Furthermore, a groove is provided on the side wall of the retaining ring, and the groove extends from the free end of the retaining ring toward the connecting end of the retaining ring to expose the second counterbore and the second threaded hole, and the groove is connected with the first cavity.

[0013] Furthermore, the number of the side holes is three, the number of the first threaded through hole, the first countersunk hole and the first threaded hole is four, and the number of the second threaded through hole, the second countersunk hole, the groove and the second threaded hole is three.

[0014] Furthermore, the through hole of the adjustment seat includes a spherical hole and a cylindrical hole that are connected to each other, and the rotating member is accommodated in the spherical hole.

[0015] Furthermore, the through holes are evenly arranged in n (n is a positive integer) groups, and the through holes in each group are evenly arranged radially around the same circle, and each group of through holes is evenly arranged in m numbers, and the central angle of two adjacent through holes in the same group is 17.5°, and the through holes in the same group are evenly arranged in a circular arc shape, and the radiation radius range of each group of through holes is 44.3mm to 44.7mm.

[0016] The positive effects of the adjustable centering device of the present invention are:

[0017] (1) A centering adjustable device is formed by a raised seat, an intermediate seat and a retaining ring connected in sequence. An upper in-core component and a lower in-core component are respectively arranged at two ends of the centering adjustable device. An adjustment mechanism is arranged in a first cavity of the retaining ring, and an adjustment member is arranged on a side wall of the retaining ring. According to the positional relationship between the upper in-core component and the lower in-core component, the adjustment seat of the adjustment mechanism is rotated, and the adjustment seat and the second ring are positioned and clamped by the adjustment member, so as to realize the centering adjustment during the centering assembly process of the upper in-core component and the lower in-core component of the nuclear power plant.

[0018] (2) By replacing and assembling the adjustable centering devices of different heights, the centering adjustment of the upper internals and the lower internals of reactors of different types can be achieved.

[0019] (3) The adjustable centering device is small in size, simple in structure, good in manufacturing processability, convenient in operation, and accurate in adjustment. It effectively reduces the time for centering adjustment of the upper and lower in-pile components and shortens the product manufacturing cycle.

[0020] (4) The adjustable centering device described in the present application is not only suitable for adjusting the centering position between the upper in-pile component and the lower in-pile component in the field, but also suitable for occasions in other fields where the position of parts needs to be slightly adjusted. It has strong practicality and wide adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A A top view of an adjustable centering device of the present invention;

[0022] Figure 1B for Figure 1A Schematic diagram of the cross section of AA;

[0023] Figure 2 It is a cross-sectional schematic diagram of the raised seat of the present invention;

[0024] Figure 3A It is a cross-sectional schematic diagram of the intermediate seat of the present invention;

[0025] Figure 3B for Figure 3A A top view of

[0026] Figure 4A It is a cross-sectional schematic diagram of the retaining ring of the present invention;

[0027] Figure 4B for Figure 4A A top view of

[0028] Figure 5A It is a structural schematic diagram of the adjustment seat of the present invention;

[0029] Figure 5B for Figure 5A Side view of

[0030] Figure 5C for Figure 5A A magnified view of the through hole;

[0031] Figure 6 It is a schematic diagram of the structure of the first ring and the second ring of the present invention;

[0032] Figure 7 The figure is a schematic diagram of the working position of an adjustable centering device of the present invention.

[0033] The numbers in the figure are:

[0034] 1. Raised seat; 2. Middle seat;

[0035] 3. Retaining ring; 4. Adjusting mechanism;

[0036] 5. First ring; 6. Adjustment seat;

[0037] 7. Second ring; 8. Adjustment piece;

[0038] 9. First cavity; 10. Side hole;

[0039] 61. through hole; 11. first end surface;

[0040] 12. second end surface; 13. first through hole;

[0041] 14. A first threaded through hole; 15. A first countersunk hole;

[0042] 221, connecting surface; 222, bearing surface;

[0043] 223, steps; 21, first end;

[0044] 22. second end; 23. first threaded hole;

[0045] 24. Second threaded hole; 31. Connecting end;

[0046] 32. free end; 33. first part;

[0047] 34. second portion; 331. first inner hole;

[0048] 341, second inner hole; 35, groove;

[0049] 36. Second countersunk hole; 37. Second threaded through hole;

[0050] B, circumference; α, angle;

[0051] r, SR, radius; R, radiation radius;

[0052] β, diameter; H1, H2, depth;

[0053] 51, first side; 52, second side;

[0054] 62. first surface; 63. second surface;

[0055] 611, spherical hole; 612, cylindrical hole;

[0056] 200. Adjustable centering device; 300. Upper internal components;

[0057] 400. Lower pile internals. DETAILED DESCRIPTION

[0058] The specific implementation modes of the device of the present invention are given below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following implementation modes.

[0059] See also Figure 1A , Figure 1B and Figure 7 , Figure 1A A top view of an adjustable centering device of the present invention; Figure 1B for Figure 1A Schematic diagram of the cross section of AA; Figure 7 The present invention provides an adjustable centering device 200, which is suitable for adjusting the centering position during the centering assembly process of the upper in-core component 300 and the lower in-core component 400 of a nuclear power plant. Figure 7 As shown, multiple sets of the adjustable centering devices 200 are used to be placed between the flanges of the upper internals 300 and the lower internals 400. According to the relative positions of the upper internals 300 and the lower internals 400, the adjustable centering devices 200 are adjusted to achieve centering adjustment of the positions of the upper internals 300 and the lower internals 400. Figure 1A and Figure 1BAs shown, the adjustable centering device 200 includes a raised seat 1, an intermediate seat 2, a retaining ring 3, and an adjusting mechanism 4 which are axially connected in sequence. The adjustable centering device 200 also includes at least one adjusting member 8 which is radially arranged. The adjusting mechanism 4 includes a first ring 5, an adjusting seat 6, and a second ring 7 which are axially arranged in sequence in the retaining ring 3. In the present application, after assembly, the adjustable centering device 200 has at least one pair of equal height surfaces, and wherein the raised seat 1, the intermediate seat 2, the retaining ring 3, the first ring 5, the adjusting seat 6, and the second ring 7 respectively have at least one pair of equal height surfaces, and the equal height surfaces are used to ensure that the adjustable centering device 200 is a uniform equal height device. In the present embodiment, the raised seat 1, the intermediate seat 2, the retaining ring 3, the first ring 5, the adjusting seat 6, and the second ring 7 are all disc-shaped structural members, and the two end surfaces of the disc-shaped member are arranged in parallel.

[0060] Please continue to see Figure 1B The retaining ring 3 includes a first cavity 9 arranged axially, and the retaining ring 3 includes at least one side hole 10 ( Figure 4A The adjusting member 8 passes through the side hole 10 and is used to adjust the adjusting seat 6 and the second ring 7. The adjusting mechanism 4 is accommodated in the first cavity 9, that is, the first ring 5, the adjusting seat 6 and the second ring 7 are sequentially arranged in the first cavity 9, and the first ring 5 is arranged on the side of the retaining ring 3 close to the middle seat 2. Figure 1B As shown, the raising seat 1, the middle seat 2, the first ring 5, the adjusting seat 6 and the second ring 7 are matched in sequence, and the two end portions of the centering adjustable device 200 after the matching are respectively used to support the upper in-pile component 300 and the lower in-pile component 400.

[0061] See also Figure 2 , Figure 2 Schematic diagram of the cross section of the raised seat of the present invention. Figure 2 As shown, the cushion seat 1 has a first end face 11 and a second end face 12 opposite to each other. The first end face 11 serves as a reference plane. The flatness of the first end face 11 is 0.012. The parallelism of the second end face 12 relative to the first end face 11, i.e., the reference plane, is 0.015. The plane roughness requirements of the first end face 11 and the second end face 12 are both 1.6.

[0062] Please continue to see Figure 2As a preferred embodiment, the raised seat 1 has an axially arranged first through hole 13 and a plurality of first threaded through holes 14 and a plurality of first countersunk holes 15 evenly arranged around the axis of the first through hole 13. The first countersunk holes 15 are coaxial with and connected to the first threaded through hole 14. The first countersunk holes 15 are arranged at the end of the raised seat 1 away from the middle seat 2. The inner diameter of the first countersunk hole 15 is greater than the inner diameter of the first threaded through hole 14. In this embodiment, the number of the first threaded through hole 14 and the number of the first countersunk holes 15 are 4 respectively.

[0063] See also Figure 3A and Figure 3B , Figure 3A It is a cross-sectional schematic diagram of the intermediate seat of the present invention; Figure 3B for Figure 3A The intermediate seat 2 includes a first end 21 and a second end 22. Figure 1B As shown, the end surface of the first end 21 contacts the second end surface 12 of the raising seat 1, and the first end 21 is axially connected to the second end surface 12 of the raising seat 1, and the connection method is a detachable connection. Figure 1B As shown, the cushion seat 1 is connected to the first end 21 of the middle seat 2 by threaded fitting.

[0064] See also Figure 3A and Figure 3B , and continue to see Figure 1B The first end 21 of the intermediate seat 2 is provided with a first threaded hole 23 at the position where it cooperates with the raising seat 1. The first threaded hole 23 and the first threaded through hole 14 of the raising seat 1 are arranged one by one opposite to each other. The first threaded through hole 14 and the first threaded hole 23 are connected by screws, and the connection method is threaded connection.

[0065] See you next Figure 3A The second end 22 of the intermediate seat 2 includes a connecting surface 221, a bearing surface 222, and a step 223 disposed between the bearing surface 222 and the connecting surface 221, wherein the connecting surface 221 is a circular annular surface, the bearing surface 222 protrudes from the connecting surface 221 by a certain height, the bearing surface 222 and the end surface of the first end 21 form a pair of equal height surfaces, wherein the flatness of the end surface of the first end 21 is 0.012, and the parallelism of the connecting surface 221 relative to the end surface of the first end 21 is 0.012. Figure 1BAs shown, the side wall of the middle seat 2, the connecting surface 221, the step 223, the bearing surface 222 and the inner wall of the middle seat 2 are connected in sequence. In addition, in multiple sets of the centering adjustable device 200 of the present application, whether the connecting surface 221 and the end surface of the first end 21 are at the same height does not need to be specifically limited, that is, in some embodiments, the connecting surface 221 and the end surface of the first end 21 may form a pair of equal-height surfaces, and in some other embodiments, the connecting surface 221 and the end surface of the first end 21 may not form a pair of equal-height surfaces.

[0066] See also Figure 4A and Figure 4B , Figure 4A It is a cross-sectional schematic diagram of the retaining ring of the present invention; Figure 4B for Figure 4A A top view of the Figure 4A As shown, the retaining ring 3 includes a connecting end 31 and a free end 32, and Figure 1B As shown, the connecting end 31 is axially engaged and connected to the second end 22 of the intermediate seat 2, and the connection method is a detachable connection.

[0067] Please continue to see Figure 4A and Figure 4B The retaining ring 3 includes a first portion 33 and a second portion 34 which are axially connected in one piece. The first portion 33 is located at one side of the connecting end 31, and the second portion 34 is located at one side of the free end 32. The first portion 33 and the second portion 34 respectively have a first inner hole 331 and a second inner hole 341. The first inner hole 331 and the second inner hole 341 are connected to each other, and the first inner hole 331 and the second inner hole 341 constitute the first cavity 9. A plurality of grooves 35 are evenly spaced on the side wall of the second portion 34, and each of the grooves 35 extends from the free end 32 of the retaining ring 3 to the connecting end 31 of the retaining ring 3. Specifically, the groove 35 vertically penetrates from the free end 32 to the first portion 33, and the groove 35 extends to the connection between the first portion 33 and the second portion 34. In addition, in this embodiment, the groove 35 is not connected to the first inner hole 331. In other embodiments, the groove 35 can be designed to be connected to the first inner hole 331 according to actual needs.

[0068] Please continue to see Figure 3A and Figure 4A The connecting end 31 of the retaining ring 3 abuts against the connecting surface 221 and the step 223 of the intermediate seat 2. Specifically, the surface of the step 223 matches the surface of the first inner hole 331. The inner wall of the retaining ring 3 and the bearing surface 222 of the intermediate seat 2 are arranged to form the first cavity 9.

[0069] As a preferred embodiment, Figure 4A and Figure 4B As shown, the retaining ring 3 is axially provided with a plurality of second threaded through holes 37 and a plurality of second countersunk holes 36, the second countersunk holes 36 are coaxial with and connected to the second threaded through holes 37, wherein the second threaded through holes 37 are provided on one side of the connecting end 31, the second countersunk holes 36 are provided on the side of the second portion 34 of the retaining ring 3 close to the first portion 33, and the inner diameter of the second countersunk holes 36 is larger than the inner diameter of the second threaded through holes 37. Furthermore, the second threaded through holes 37 and the second countersunk holes 36 are provided in a one-to-one correspondence with the grooves 35, the second countersunk holes 36 are connected to the grooves 35, and the grooves 35 are used to expose the second countersunk holes 36 and the second threaded through holes 37. And, as Figure 3A As shown, the connecting surface 221 of the intermediate seat 2 is provided with a second threaded hole 24 at the cooperation position with the retaining ring 3, and the second threaded hole 24 is used to be connected with the second threaded through hole 37 by means of a screw, and the screw penetrates from one side of the second countersunk hole 36 and extends to the inside of the second threaded hole 24 of the intermediate seat 2.

[0070] Please continue to see Figure 1B , Figure 4A and Figure 4B The side holes 10 of the retaining ring 3 are evenly arranged on the side wall of the retaining ring 3 , the side holes 10 are arranged along the radial direction of the retaining ring 3 , and the side holes 10 are threaded through holes.

[0071] like Figure 1B As shown, the adjusting member 8 passes through the side hole 10 and abuts against the outer peripheral surface of the adjusting seat 6 and the second ring 7. The adjusting member 8 is used to adjust the adjusting seat 6 and the second ring 7, that is, the adjusting member 8 is used to position and clamp the adjusting seat 6 and the second ring 7. The adjusting seat 6 includes a plurality of circumferentially arranged through holes 61 and a rotating member arranged in the through holes 61.

[0072] Please continue to see Figure 1B , Figure 4A and Figure 4B , the number of the side holes 10 and the adjusting member 8 are three, the number of the second threaded through hole 37, the second countersunk hole 36, the groove 35, the second threaded hole 24 and the screws for connection are three, the side holes 10 and the second threaded through holes 37 are staggered, the central angle formed by the side holes 10 and the adjacent second threaded through holes 37 is 60°, and, as Figure 3B As shown, the number of the first threaded through hole 14 , the first countersunk hole 15 , the first threaded hole 23 and the screws used for connection are all four.

[0073] See also Figure 5A , Figure 5B and Figure 5C , Figure 5A It is a structural schematic diagram of the adjustment seat of the present invention; Figure 5B for Figure 5A Side view of Figure 5C for Figure 5A In this embodiment, the through holes 61 are evenly arranged in n (n is a positive integer) groups, and the through holes 61 in each group are evenly arranged in a radial shape around the same circumference; and the through holes 61 in each group are evenly arranged in m groups, and the through holes 61 in the same group are evenly arranged in an arc shape, that is, the centers of all the through holes 61 in the same group form the same arc, and the angle between the center angles of two adjacent through holes 61 in the same group is α; and the radiation radius of each group of through holes 61 is R.

[0074] like Figure 5A As shown, as a preferred embodiment, the number of the through holes 61 is 28, and the through holes 61 are evenly arranged in 7 groups, and the through holes 61 in each group are arranged radially, and the radiation center of each group of the through holes 61 is surrounded by a circle B, and the radius of the circle B is r, wherein each group of the through holes 61 is evenly arranged in 4, and the central angle α of two adjacent through holes 61 in the same group is 17.5°, and the radiation radius R of each group of the through holes 61 is in the range of 44.5mm±0.2mm, that is, 44.3mm~44.7mm.

[0075] like Figure 5B As shown, the adjustment seat 6 has a first surface 62 and a second surface 63. The flatness of the first surface 62 is 0.02. Taking the first surface 62 as a reference plane, the parallelism of the second surface 63 relative to the reference plane, i.e., the first surface 62, is 0.02. The first surface 62 and the second surface 63 are a pair of equal-height surfaces.

[0076] like FIG. 5A to FIG. 5C As shown, in this embodiment, a through hole 61 includes a spherical hole 611 and a cylindrical hole 612 which are connected, wherein the spherical hole 611 is located on one side of the first surface 62, and the cylindrical hole 612 is located on one side of the second surface 63, the depth of the spherical hole 611 is H1, and the depth of the cylindrical hole 612 is H2, wherein the value of H1+H2 is the thickness of the adjustment seat 6, the radius of the spherical hole 611 is SR, and the diameter of the cylindrical hole 612 is β. And in this embodiment, the rotating member is a ball, and the ball is received in the spherical hole 611, and the adjustment seat 6 is rotated by the ball.

[0077] Please continue to see Figure 1B , and see Figure 6 , Figure 6 Schematic diagram of the structure of the first ring and the second ring of the present invention. The first ring 5 and the second ring 7 are the same ring structure. Figure 6 As shown, the ring structure has a first surface 51 and a second surface 52 opposite to each other. The flatness of the first surface 51 is 0.012. Taking the first surface 51 as the reference surface, the parallelism of the second surface 52 relative to the first surface 51 is 0.012. The surface roughness of the first surface 51 and the second surface 52 are both 0.8. The first surface 51 and the second surface 52 are processed at the same height, and the first surface 51 and the second surface 52 form a pair of equal height surfaces. Since the first ring 5 and the second ring 7 are used to carry the rotating parts respectively, the materials of the first ring 5 and the second ring 7 are selected as Cr12 forgings, which have the characteristics of high strength, good hardenability and good wear resistance, and the surface hardness is HRC48~HRC52, which meets the load-bearing requirements in this embodiment.

[0078] In addition, it should be noted that the heights of the raising seat 1, the middle seat 2 and the retaining ring 3 all have at least one pair of equal height surfaces, and the sum of the heights of the raising seat 1, the middle seat 2 and the retaining ring 3 is equal to the size of the upper in-pile component 300 and the lower in-pile component 400 after the compression springs are compressed.

[0079] The method for using the adjustable centering device 200 provided by the present invention is as follows:

[0080] like Figure 1A , Figure 1B and Figure 7 As shown, the raising seat 1, the middle seat 2, the retaining ring 3, the first ring 5, the adjusting seat 6, and the second ring 7 are processed and assembled to form the centering adjustable device 200, and the assembly process of the centering adjustable device 200 includes: fixing the raising seat 1 and the middle seat 2 by 4 screws, and fixing the middle seat 2 and the retaining ring 3 by 3 screws; installing the first ring 5, the adjusting seat 6 and the second ring 7 in sequence on the inner side of the first cavity 9 of the retaining ring 2; the rotating part is installed in the spherical hole 611 of the adjusting seat 6; the adjusting part 8 is installed in the side hole 10 on the retaining ring 3.

[0081] When the adjustable centering device 200 is used, the position of the lower internal component 400 is first fixed, multiple sets of the adjustable centering devices 200 are placed at the upper end between the flanges of the lower internal component 400, and then the upper internal component 300 is hoisted onto the adjustable centering device 200.

[0082] Then, according to the positional relationship between the upper in-piles component 300 and the lower in-piles component 400, the adjustable centering device 200 is adjusted, and the adjustment process includes: adjusting the adjusting member 8 of the adjustable centering device 200 to move the adjustment seat 6 and the second ring 7, wherein the movement of the adjustment seat 6 and the second ring 7 is achieved by the rolling of the ball in the spherical hole 611, thereby driving the movement of the upper in-piles component 300, thereby achieving the centering adjustment of the upper in-piles component 300 and the lower in-piles component 400 by the adjustable centering device 200.

[0083] In addition, the method for using the adjustable centering device 200 also includes: by replacing and assembling the adjustable centering device 200 of different heights, the centering adjustment of the upper internals 300 and the lower internals 400 of different reactor types is achieved.

[0084] It is worth mentioning that the centering adjustable device 200 is also applicable to other occasions where the position of parts needs to be slightly adjusted. That is, the centering adjustable device 200 includes but is not limited to adjusting the centering position between the upper internal component 300 and the lower internal component 400 in the above embodiment, and the centering adjustable device 200 can also be used to adjust the centering position between other parts.

[0085] The advantage of the adjustable centering device 200 provided by the present invention is that the adjustable centering device 200 is formed by the sequentially connected cushion seat 1, the middle seat 2, the retaining ring 3 and the adjusting mechanism 4, so that the two ends of the adjustable centering device 200 are supported between the upper internal component 300 of the nuclear power plant and the lower internal component 400, the adjusting mechanism 4 is arranged in the first cavity 9 of the retaining ring 3, and the adjusting member 8 is arranged on the side wall of the retaining ring 3, according to the upper internal component 300 and the lower internal component 400, the adjusting seat 6 and the second ring 7 of the adjusting mechanism 4 are moved to drive the upper in-pile component 300 to move, so as to realize the centering adjustment of the upper in-pile component 300 and the lower in-pile component 400 during the centering assembly process; and the centering adjustable device 200 is small in size, simple in structure, good in manufacturing process, convenient in operation and accurate in adjustment, which can effectively reduce the centering adjustment time of the upper in-pile component 300 and the lower in-pile component 400 and shorten the product manufacturing cycle. In addition, the centering adjustable device 200 described in the present application is not only suitable for adjusting the centering position between the upper in-pile component 300 and the lower in-pile component 400 in this field, but also suitable for occasions in other fields where the position of parts needs to be slightly adjusted, and has strong practicality and wide adaptability.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An adjustable centering device, suitable for adjusting the centering position of upper and lower internal components of a nuclear power plant, characterized in that: The adjustable centering device comprises a cushion seat, an intermediate seat, a retaining ring, an adjustment mechanism, and a radially arranged adjustment member which are axially connected in sequence, wherein: The retaining ring comprises a first cavity arranged axially and at least one side hole vertically penetrating the side wall of the retaining ring, and the adjusting mechanism is accommodated in the first cavity; The adjustment mechanism comprises a first ring, an adjustment seat, and a second ring which are sequentially arranged axially, the adjustment seat comprises a plurality of circumferentially arranged through holes and a rotating member arranged in the through holes; the adjustment seat has a first surface and a second surface, the first surface and the second surface are a pair of equal height surfaces; the through hole comprises a spherical hole and a cylindrical hole which are connected to each other, wherein the spherical hole is located on one side of the first surface, and the cylindrical hole is located on one side of the second surface; the rotating member is a ball, and the ball is accommodated in the spherical hole; The adjusting member passes through the side hole and is used to adjust the adjusting seat and the second ring; The raising seat, the middle seat, the first ring, the adjusting seat and the second ring are matched in sequence and used to support the upper internal components and the lower internal components.

2. The adjustable centering device according to claim 1, characterized in that: The raising seat, the middle seat, the retaining ring, the first ring, the adjusting seat and the second ring respectively have at least one pair of equal height surfaces along the axial direction.

3. The adjustable centering device according to claim 1, characterized in that: The intermediate seat includes a first end and a second end, the first end is axially connected to the raised seat in a detachable manner; the retaining ring includes a connecting end and a free end, the connecting end is axially engaged and connected to the second end of the intermediate seat in a detachable manner.

4. The adjustable centering device according to claim 3, characterized in that: The raising seat is threadably connected to the first end of the intermediate seat, wherein the raising seat is evenly axially provided with a plurality of first threaded through holes and a plurality of first countersunk holes, the first countersunk holes are coaxial with and connected to the first threaded through holes, and the first countersunk holes are arranged at the end of the raising seat away from the intermediate seat, the inner diameter of the first countersunk hole is larger than the inner diameter of the first threaded through hole, and the first end of the intermediate seat is provided with a first threaded hole at the fitting position, and the first threaded hole is connected to the first threaded through hole by screws.

5. The adjustable centering device according to claim 4, characterized in that: The second end of the intermediate seat includes a connecting surface, a bearing surface, and a step arranged between the bearing surface and the connecting surface, wherein the connecting end of the retaining ring abuts against the connecting surface and the step of the intermediate seat, and the inner wall of the retaining ring and the bearing surface of the second end are arranged to form the first cavity.

6. The adjustable centering device according to claim 5, characterized in that: A plurality of second threaded through holes and a plurality of second countersunk holes are evenly arranged axially on the retaining ring, the second countersunk holes are coaxial with and connected to the second threaded through holes, the second countersunk holes are arranged at the free end of the retaining ring, the inner diameter of the second countersunk holes is larger than the inner diameter of the second threaded through holes, and the connecting surface of the intermediate seat is provided with a second threaded hole at the mating position, and the second threaded hole is connected to the second threaded through hole by screws.

7. The adjustable centering device according to claim 6, characterized in that: A groove is provided on the side wall of the retaining ring, and the groove extends from the free end of the retaining ring toward the connecting end of the retaining ring to expose the second counterbore and the second threaded hole, and the groove is connected with the first cavity.

8. The adjustable centering device according to claim 7, characterized in that: The number of the side holes is three, the number of the first threaded through hole, the first countersunk hole and the first threaded hole are all four, and the number of the second threaded through hole, the second countersunk hole, the groove and the second threaded hole are all three.

9. The adjustable centering device according to claim 1, characterized in that: The through holes are evenly arranged in n (n is a positive integer) groups, and the through holes in each group are evenly arranged radially around the same circumference. Moreover, the through holes in each group are evenly arranged in m numbers, and the central angle of two adjacent through holes in the same group is 17.5°. Furthermore, the through holes in the same group are evenly arranged in an arc shape, and the radiation radius range of each group of through holes is 44.3mm to 44.7mm.

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