1. An integrated control rod assembly spider, characterized in that it is composed of a plurality of wings (4) arranged at predetermined angles around a central cylinder (2) to form a member having a star-shaped cross-section, which is integrally machined.

2. An integrated control rod assembly spider as set forth in claim 1 and employing three configurations of type I (21), type II (19) and type III (20) wings.

3. The integrated control rod assembly spider as recited in claim 2, wherein the I-shaped wing (21) is shortest and comprises an upper triangular rib (22), a step (23), a square block (24) and a lower triangular rib (25) from top to bottom;

the II-shaped wing plate (19) is longest and sequentially comprises an upper triangular rib, a step, a square block and a lower triangular rib from top to bottom;

III type pterygoid lamina (20) length is located I type pterygoid lamina (21) with between II type pterygoid lamina (19) length, from last triangle muscle, square piece and lower triangle muscle of including in proper order down.

4. An integrated control rod assembly spider as set forth in claim 1 wherein the vanes (4) and fingers (3) are joined by separate post-machining brazing.

5. An integrated control rod assembly spider as set forth in claim 1 wherein the upper and lower ends of the wings (4) are provided with chamfers (17), the wings (4) transitioning with the central barrel (2) through root chamfers (18).

6. The integrated control rod assembly spider as set forth in claim 1, wherein the central cylinder (2) is provided with an internal thread (7) inside the upper end thereof, and is fixedly connected with an extension bar below the detachable head through the internal thread (7); the lower round hole of the central cylinder (2) is an inner cavity (10).

7. An integrated control rod assembly spider as set forth in claim 6 wherein the top end of the bore 10 of the central barrel (2) is provided with a step (8) and the top end of the tension screw (11) is secured to the step (8) by a screw-fit connection and then welded.

8. An integrated control rod assembly spider as set forth in claim 7 wherein a buffer spring (9) is mounted between the inner cavity (10) and the tension screw (11), the buffer spring (9) being compressible on the tension screw (11) along its axis;

a buffer cup (5) is arranged at the bottom end of the tensioning screw rod (11), and the buffer cup (5) can move along the axis of the tensioning screw rod (11).

9. An integrated control rod assembly spider as set forth in claim 1 wherein the wings (4) are fixedly connected perpendicular to each other by their upper squares and/or steps in cooperation with different types of fingers (3) in predetermined positions.

10. A control rod assembly comprising a control rod (6), further comprising a spider as claimed in any one of claims 1 to 9.

11. Control rod assembly as set forth in claim 10, characterized in that the control rod (6) is fixedly attached to the fingers (3) of the spider and then fixed by spot welding.

Background

The control rod assembly has the functions of starting and stopping the reactor, changing the power of the reactor and protecting the reactor. In a pressurized water reactor, a control rod assembly is comprised of a spider having a plurality of wings mounted at an angle about a central axis and a plurality of control rods which are threadably connected to the spider (as shown in FIG. 1). During emergency shutdown, the control rod assembly is required to be quickly and completely inserted into the reactor core, and when the control rod drop is finished, the control rod drop buffering is required, so that the great drop speed and acceleration are reduced, and the overlarge impact load on the fuel assembly is avoided when the control rod assembly drops.

The control rod assemblies used in the prior art comprise 16 wings each carrying a finger at its end or middle, some wings also having a middle finger in the middle. Thus, the control rod assembly has 24 control rods. The star frame at the present stage is a welded assembly, is arranged in the connecting cylinder clamping groove through the wing plate and is brazed, in order to ensure the positioning and mounting accuracy and the welding thermal deformation of the control rod, the welding operation is time-consuming and difficult, the manufacturing process of the structure scheme is complex, and the structure size accuracy is low.

Existing control assemblies include a number of paddles and a number of control elements with handles that pass through the paddles. Each shank is provided with a threaded portion which are all located a distance above the wing. A fastener is threaded onto the threaded portion to lock the control member against the wing. At the time of replacement, the shank and fastener are severed between the wings and the threaded portion, thereby loosening the rod to be removed. However, this form of control rod assembly has certain disadvantages such as complicated manufacturing schemes, the tendency to impede the sliding of the control rods within the fuel assembly guide tubes, etc.

Disclosure of Invention

In order to solve the problems that the existing control assembly is complex in manufacturing process, low in size precision or easy to hinder control rod sliding and the like, the invention provides an integrated control rod assembly star frame. The wing plate and the connecting cylinder of the star frame adopt an integrated structural design and an integrally formed structure, so that the brazing connection between the wing plate and the connecting cylinder can be eliminated, and the structural reliability of the control rod assembly is improved.

The invention is realized by the following technical scheme:

an integrated control rod assembly spider is formed by arranging a plurality of wing plates at a preset angle around a central cylinder to form a member with a cross section in a star shape, and the member is integrally processed.

Preferably, the star frame of the invention adopts three structural forms of wing plates, namely an I-type wing plate, a II-type wing plate and a III-type wing plate.

Preferably, the I-shaped wing plate is shortest and sequentially comprises an upper triangular rib, a step, a square block and a lower triangular rib from top to bottom;

the II-shaped wing plate is longest and sequentially comprises an upper triangular rib, a step, a square block and a lower triangular rib from top to bottom;

III type pterygoid lamina length is located I type pterygoid lamina with between II type pterygoid lamina length, from last triangle muscle, square piece and lower triangle muscle of including in proper order down.

Preferably, the wing plate and the finger of the present invention can be connected by brazing after being separately processed.

Preferably, chamfers are arranged at the upper end and the lower end of the wing plate, and the wing plate and the central cylinder are in transition through the root chamfers.

Preferably, the inner side of the upper end of the central cylinder is provided with an internal thread which is fixedly connected with the extension bar below the detachable head; the lower round hole of the central cylinder is an inner cavity.

Preferably, the top end of the inner cavity 10 of the central cylinder is provided with a step, and the top end of the tensioning screw rod is fixed on the step through threaded fit connection and then welded and fixed.

Preferably, a buffer spring is arranged between the inner cavity and the tensioning screw rod, and the buffer spring can be compressed on the tensioning screw rod along the axis of the buffer spring;

and a buffer cup is arranged at the bottom end of the tensioning screw rod and can move along the axis of the tensioning screw rod.

Preferably, the wing plates of the present invention are vertically and fixedly connected to each other by means of square blocks and/or steps thereon, which are engaged with different types of fingers at predetermined positions.

In another aspect, the invention also provides a control rod assembly comprising a control rod and the spider of the invention.

Preferably, the control rod of the invention is fixedly connected to the fingers of the spider and then fixed by spot welding.

The invention has the following advantages and beneficial effects:

the invention provides a high-reliability integrated control rod assembly star frame which can eliminate the brazing connection between a wing plate and a connecting cylinder, is simple in manufacturing process, improves the structural reliability of a control rod assembly, improves the positioning precision between a control rod and a guide tube, and improves the rod falling buffering performance of the control rod assembly.

The star frame is also provided with a buffer device consisting of a central cylinder, a tensioning screw rod, a buffer spring and a buffer cup, and the star frame can play a role in energy buffer in the process of inserting the control rod into the guide tube by the control rod assembly, so that the impact force of the falling control rod is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic view of a control rod assembly configuration.

FIG. 2 is a schematic view of the control rod assembly connecting handle of the present invention.

FIG. 3 is a half sectional view of a control rod assembly stem construction of the present invention.

FIG. 4 is a partial schematic view of the control rod assembly of the present invention.

FIG. 5 is a schematic view of an integrated control rod assembly spider configuration of the present invention.

FIG. 6 is a top view of the integrated control rod assembly spider of the present invention.

FIG. 7 is a schematic view of an integrated control rod assembly spider wing configuration of the present invention.

Reference numbers and corresponding part names in the drawings:

the structure comprises a star-shaped frame 1, a central barrel 2, fingers 3, a star-shaped frame wing plate 4, a buffer cup 5, a control rod 6, a central barrel internal thread 7, a central barrel internal step 8, a buffer spring 9, a central barrel inner cavity 10, a tensioning screw 11, a long finger and wing plate welding seam 12, a short finger and wing plate welding seam 13, a finger internal thread 14, a control rod pin hole 15, a control rod upper end plug 16, a wing plate thickness chamfer 17, a wing plate root chamfer 18, a wing plate II, a wing plate III 20, a wing plate I21, a wing plate upper triangular rib 22, a wing plate step 23, a wing plate square block 24 and a wing plate lower triangular rib 25.

Detailed Description

Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.

In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.

Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.

It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.

The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1

To improve the structural reliability of the stem, the present embodiment proposes an integrated control rod assembly spider. As shown in fig. 2-7. The spider 1 of the present embodiment is composed of three different types of wing plates arranged at a predetermined angle around a central cylinder 2 to form a member having a star-shaped cross section. Wherein, the star frame 1 is integrally processed by a stainless steel forging.

The star frame 1 of the present embodiment has three types of wing plates, I-type wing plate 21, II-type wing plate 19, and III-type wing plate 20, wherein there are 4 wing plates 21, 19, and 20, as shown in fig. 6.

The I-shaped wing plate 21 of this embodiment is the shortest in length, and includes 2 triangle muscle (triangle muscle 22 on the pterygoid lamina and triangle muscle 25 under the pterygoid lamina), 1 step 23 and 1 square piece 24 from top to bottom, and the triangle muscle passes through the circular arc transition with a center section of thick bamboo 2 from top to bottom. The II-type wing plate 19 is longest in length and also consists of an upper triangular rib, a lower triangular rib, 1 step and 1 square block, and the upper triangular rib and the lower triangular rib are in transition with the central cylinder through fillets. The type III wing plate 20 is of a medium length and comprises only 2 triangular ribs and 1 square block from top to bottom, and the upper and lower triangular ribs and the central cylinder are in circular arc transition as shown in fig. 6-7. The three wings are radially spaced at an angle around the central cylinder 2.

The wing plate and the finger 3 of the embodiment can be respectively processed and then connected by brazing. The upper and lower ends of the wing plate of this embodiment are provided with chamfers 17, and the wing plate and the central cylinder 2 are transited by root chamfers 18, as shown in fig. 5.

The central cylinder 2 of the embodiment is a cylindrical thick-wall pipe structure, the inner side of the upper end of the central cylinder is provided with an internal thread 7 which is fixedly connected with an extension bar below a detachable head, the top of a tensioning screw rod 11 is also provided with a thread, the top end of the tensioning screw rod 11 is fixed on a step 8 in the central cylinder through thread matching, and then the central cylinder is welded and fixed. The lower round hole of the central cylinder 2 is an inner cavity 10, a buffer spring 9 is arranged between the inner cavity 10 and the tensioning screw 11, and the buffer spring 9 can be compressed on the tensioning screw 11 along the axis thereof. A buffer cup 5 is mounted on the lower end of the tension screw 11, and the buffer cup 5 is movable along the axis of the tension screw 11. The central tube 2, the tightening screw 11, the buffer spring 9 and the buffer cup 5 together form a buffer device, as shown in fig. 2-3.

The star frame 1 is fixedly connected with the fingers 3 of different types through brazing after matching with preset positions through wing plate steps and wing plate square blocks, the radial positions of the fingers 3 are guaranteed, and as shown in figure 4, the star frame 1 is fixedly connected with the long fingers through the wing plate steps and is fixedly connected with the short fingers through the wing plate square blocks.

The control rod 6 is matched with the stepped hole in the finger rod 3 through the cylindrical section of the upper end plug 16, and is matched and connected with the internal thread of the finger rod 3 through the external thread section at the top end of the upper end plug 16, so that the control rod 6 is fixed on the finger rod 3. After the control rod 6 is fixed on the finger rod 3, the pin hole 15 is drilled and welded and fixed in a spot welding mode.

Adopt the embodiment the control rod subassembly of high reliability integral type control rod subassembly star frame constitution, on the one hand, the control rod subassembly inserts the control rod in the stand pipe, and the hydraulic buffer effect through control rod and stand pipe buffer section absorbs most of the rod falling kinetic energy of control rod, on the other hand, strikes the fuel assembly upper tube socket through the buffer in the control rod subassembly star frame on, plays the energy buffer effect to reach the mesh that reduces control rod falling impact force.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.