阅读说明：本技术 一种反应堆压力容器主密封面测量装置 (Reactor pressure vessel main seal face measuring device ) 是由 张军超 刘勇 尤晓波 易良川 曾振华 姜华 张建军 曹晔 隋震 赵翔 于 2020-12-29 设计创作，主要内容包括：本发明属于核电站反应堆检修领域,具体涉及一种反应堆压力容器主密封面测量装置,包括：测量仪表、测量仪表固定杆、锁紧螺母、可伸缩测量表头和支撑座；测量仪表底部连接有可伸缩测量表头,测量仪表固定连接于测量仪表固定杆的上部；锁紧螺母套设于支撑座上,锁紧螺母与支撑座可调节连接；测量仪表固定杆的下部设于支撑座内部,测量仪表固定杆与支撑座通过锁紧螺母固定连接,可伸缩测量表头由支撑座的底部伸出。本发明装置实现了对测量仪表的稳定夹持且不损伤测量仪表的固定杆,保证了测量结果的准确性。(The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to a reactor pressure vessel main sealing surface measuring device, which comprises: the device comprises a measuring instrument, a measuring instrument fixing rod, a locking nut, a telescopic measuring instrument head and a supporting seat; the bottom of the measuring instrument is connected with a telescopic measuring instrument head, and the measuring instrument is fixedly connected to the upper part of a measuring instrument fixing rod; the locking nut is sleeved on the supporting seat and is in adjustable connection with the supporting seat; inside the supporting seat was located to the lower part of measuring instrument dead lever, measuring instrument dead lever passed through lock nut fixed connection with the supporting seat, and scalable measuring gauge outfit is stretched out by the bottom of supporting seat. The device realizes the stable clamping of the measuring instrument, does not damage the fixed rod of the measuring instrument, and ensures the accuracy of the measuring result.)

1. A reactor pressure vessel primary seal face measurement apparatus, the apparatus comprising: the device comprises a measuring instrument (1), a measuring instrument fixing rod (2), a locking nut (3), a telescopic measuring instrument head (4) and a supporting seat (5); the bottom of the measuring instrument (1) is connected with a telescopic measuring instrument head (4), and the measuring instrument (1) is fixedly connected to the upper part of the measuring instrument fixing rod (2); the locking nut (3) is sleeved on the supporting seat (5), and the locking nut (3) is adjustably connected with the supporting seat (5); inside supporting seat (5) were located to the lower part of measuring instrument dead lever (2), measuring instrument dead lever (2) passed through lock nut (3) fixed connection with supporting seat (5), and scalable measuring gauge outfit (4) are stretched out by the bottom of supporting seat (5).

2. The reactor pressure vessel main seal surface measuring device according to claim 1, wherein the support base (5) comprises a base and a support rod, the support rod is vertically arranged at a central position of an upper surface of the base, the support rod is fixedly connected with the base, a vertically through cavity is arranged inside the support rod, the base is correspondingly provided with a circular hole, and the cavity of the support rod is communicated with the circular hole on the base.

3. The reactor pressure vessel main sealing surface measuring device according to claim 2, wherein the supporting seat (5) further comprises an outer conical surface (10), an expansion joint process hole (9) and a supporting seat external thread (11), the outer conical surface (10) is arranged at the top of the supporting rod, the outer conical surface (10) is a conical surface with expansion joints uniformly spaced, the expansion joint process hole (9) is formed by the inner surface of the outer conical surface (10), and the expansion joint process hole (9) is communicated with the cavity of the supporting rod; the external thread (11) of the support is arranged on the outer surface of the support rod and is positioned below the external conical surface (10).

4. The reactor pressure vessel main seal surface measuring device according to claim 3, wherein the outer conical surface (10) is provided with four conical surfaces of expansion joints at regular intervals and has a cross-shaped symmetrical structure.

5. The reactor pressure vessel main seal surface measuring device according to claim 4, wherein the supporting seat (5) further comprises arc-shaped blocks (12), the arc-shaped blocks (12) are symmetrically arranged at two ends of the lower surface of the base, and the arc-shaped blocks (12) are fixedly connected with the base.

6. A reactor pressure vessel primary seal surface measuring device according to claim 5, characterized in that the retractable gauge head (4) extends from the bottom of the base of the support base (5).

7. The reactor pressure vessel main seal surface measuring device according to claim 6, wherein the lock nut (3) comprises an inner conical surface (8) and a lock nut internal thread (13), the inner conical surface (8) is arranged at the upper part of the inner surface of the lock nut (3), the inner conical surface (8) is an integrated conical surface, and the inner conical surface (8) is matched with the outer conical surface (10); the locking nut internal thread (13) is arranged at the lower part of the inner surface of the locking nut (3) and is positioned below the inner conical surface (8), and the locking nut internal thread (13) is matched with the support external thread (11).

8. The reactor pressure vessel primary seal surface measuring device according to claim 7, wherein the lock nut (3) is sleeved on the support rod of the support base (5), and the lock nut (3) is in threaded connection with the support rod of the support base (5).

9. The reactor pressure vessel primary sealing surface measuring device as claimed in claim 8, wherein the lower part of the measuring instrument fixing rod (2) is arranged in the expansion joint technical hole (9) of the supporting seat (5), and the measuring instrument fixing rod (2) is fixedly connected with the supporting seat (5) through the extrusion of the inner conical surface (8) of the lock nut (3) to the outer conical surface (10) of the supporting seat (5).

Technical Field

The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to a reactor pressure vessel main sealing surface measuring device.

Background

The first project of the Tianwan nuclear power plant is two VVER-1000 type units, and the reactor is a B-428 type reactor. The reactor pressure vessel is an important component of the reactor for housing internals, core components (e.g., fuel assemblies, control rod assemblies and burnable poison assemblies) and other associated components (instrumentation, etc.). The reactor pressure vessel is a primary circuit coolant pressure boundary and a third barrier for preventing fission products from escaping, the design pressure is 17.64MPa, the design temperature is 350 ℃, and the hydrostatic test pressure is 24.5 MPa. The main body seal of the reactor pressure vessel is completed by combining the pressure vessel top cover and the pressure vessel, and the sealing surface between the two is called a main sealing surface. The design of primary seal face has inside and outside twice V type seal groove, in order to guarantee the leakproofness of primary seal face, needs 2 nickel packing rings of installation in inside and outside twice V type seal groove, realizes the sealed of primary seal face through the cooperation jointly of 54 kingbolts, 54 main nuts, 108 hemispherical gaskets. The sealing principle is that an integral bolt stretcher is used for stretching 54 main bolts, then 54 main nuts are screwed, and two nickel gaskets are compressed and compacted under the action of bolt pretightening force, so that the sealing of a main sealing surface is ensured.

When the nuclear power station is subjected to refueling overhaul, in order to ensure the sealing reliability of the reactor pressure vessel during the reloading, the size of the V-shaped sealing groove of the main sealing surface, the protruding amount of the nickel gasket mounted in the V-shaped sealing groove and the indentation of the pressure vessel top cover are required to be measured every time. And then, carrying out accounting according to the numerical values of the three components to ensure that the related size meets the sealing requirement. The specific measurement positions and the number are the sizes of the V-shaped sealing grooves: the inner ring has 54 measuring points, and the outer ring has 54 measuring points which are 108 measuring points; the protruding amount of the nickel gasket installed in the V-shaped seal groove is as follows: the inner ring has 54 measuring points, and the outer ring has 54 measuring points which are 108 measuring points; pressure vessel cap sealing surface indentation size: the inner ring has 54 measuring points, and the outer ring has 54 measuring points which are 108 measuring points; a total of 324 measurement points.

According to the field operation environment, the measurement position of the size of the V-shaped seal groove of the main seal surface and the protruding amount of the nickel gasket in the V-shaped seal groove is the same horizontal plane with the position where a person stands, and the person needs to squat or even lie on the ground for measurement and observation. And the pressure vessel top cap indentation measuring position is located personnel and observes the position below, needs survey personnel to squat on the ground and from bottom to top measure and observe, and two indentation depths of top cap all are about 0.17 mm. The measurement position cannot be observed when the measurement instrument is clamped by the traditional measurement device, and the measurement position is judged only by artificial estimation and measurement instrument detection. The measuring instrument has larger error of the measuring result caused by the fact that the indentation position cannot be accurately detected, and a plurality of uncertain factors exist in artificially estimating the measuring position. Therefore, the conventional measuring device holding measuring instrument cannot meet the critical dimension measurement requirement.

In addition, when the critical dimension is measured, the risk of high temperature, high radiation and foreign matter generation exists in the working environment, the measurement device which is used traditionally wastes long time during measurement, and the physical strength of personnel is large.

Therefore, it is highly desirable to develop a device for measuring the main sealing surface of a reactor pressure vessel, which can effectively overcome the drawbacks and risks in the measurement.

Disclosure of Invention

The invention aims to provide a reactor pressure vessel main sealing surface measuring device, which realizes stable clamping of a measuring instrument and does not damage a fixing rod of the measuring instrument by arranging a locking nut and an expansion joint process hole; meanwhile, the bottom of the supporting seat is designed to be a semi-open structure, so that a person can conveniently observe the measuring position and judge whether the measuring position is correct or not, and the accuracy of the measuring result is guaranteed.

The technical scheme for realizing the purpose of the invention is as follows: a reactor pressure vessel primary seal face measurement apparatus, the apparatus comprising: the device comprises a measuring instrument, a measuring instrument fixing rod, a locking nut, a telescopic measuring instrument head and a supporting seat; the bottom of the measuring instrument is connected with a telescopic measuring instrument head, and the measuring instrument is fixedly connected to the upper part of a measuring instrument fixing rod; the locking nut is sleeved on the supporting seat and is in adjustable connection with the supporting seat; inside the supporting seat was located to the lower part of measuring instrument dead lever, measuring instrument dead lever passed through lock nut fixed connection with the supporting seat, and scalable measuring gauge outfit is stretched out by the bottom of supporting seat.

Further, the supporting seat comprises a base and a supporting rod, the supporting rod is perpendicularly arranged at the center of the upper surface of the base, the supporting rod is fixedly connected with the base, a vertical through cavity is formed in the supporting rod, a round hole is correspondingly formed in the base, and the cavity of the supporting rod is communicated with the round hole in the base.

Furthermore, the supporting seat also comprises an outer conical surface, an expansion joint process hole and a supporting seat external thread, the outer conical surface is arranged at the top of the supporting rod, the outer conical surface is a conical surface with expansion joints at uniform intervals, the expansion joint process hole is formed by the inner surface of the outer conical surface, and the expansion joint process hole is communicated with the cavity of the supporting rod; the external thread of the support is arranged on the outer surface of the support rod and is positioned below the external conical surface.

Furthermore, the outer conical surface is evenly provided with four conical surfaces of the expansion joint at intervals and is in a cross-shaped symmetrical structure.

Further, the supporting seat further comprises arc-shaped blocks, the arc-shaped blocks are symmetrically arranged at two ends of the lower surface of the base, and the arc-shaped blocks are fixedly connected with the base.

Further, the telescopic measuring gauge head extends out of the bottom of the base of the supporting seat.

Furthermore, the locking nut comprises an inner conical surface and a locking nut internal thread, the inner conical surface is arranged at the upper part of the inner surface of the locking nut, the inner conical surface is an integrated conical surface, and the inner conical surface is matched with the outer conical surface; the internal thread of the locking nut is arranged at the lower part of the inner surface of the locking nut and is positioned below the inner conical surface, and the internal thread of the locking nut is matched with the external thread of the support.

Furthermore, the locking nut is sleeved on the supporting rod of the supporting seat and is in threaded connection with the supporting rod of the supporting seat.

Furthermore, the lower part of the measuring instrument fixing rod is arranged in the expansion joint process hole of the supporting seat, and the measuring instrument fixing rod is fixedly connected with the supporting seat through extrusion of the inner cone surface of the locking nut to the outer cone surface of the supporting seat.

The invention has the beneficial technical effects that:

1. the locknut of the reactor pressure vessel main sealing surface measuring device ensures the clamping firmness of the measuring instrument, thereby ensuring that measuring result errors caused by the shaking of the measuring instrument in the measuring process can be avoided;

2. the expansion joint process hole of the reactor pressure vessel main sealing surface measuring device is different from a traditional thimble type unidirectional stress locking structure, the periphery of the expansion joint process hole is contracted, uniform stress of the locking structure on a measuring instrument is guaranteed, and damage to a fixing rod of the measuring instrument is avoided;

3. the bottom of the support seat of the reactor pressure vessel main sealing surface measuring device is provided with a semi-open structure, so that a measured position can be observed, the accuracy of the measured position is ensured, and data errors caused by repeated movement are avoided;

4. the inner side and the outer side of the arc-shaped block of the supporting seat of the reactor pressure vessel main sealing surface measuring device are designed in an arc shape, so that the measuring device is different from a traditional rectangular supporting seat, the bottom contact area of the arc-shaped supporting seat is larger under the condition of the same width, and the stability of the measuring device is easier to maintain;

5. the support seat of the reactor pressure vessel main sealing surface measuring device is welded, the locking nut is connected with the support seat in a threaded fit manner, other loose parts are omitted, and foreign matter risks to a reactor area are avoided;

6. the reactor pressure vessel main sealing surface measuring device is convenient and quick to operate, greatly reduces the measuring time, and shortens the time for overhauling a critical path; the measurement can be completed quickly by a single person, and the irradiated dose of the personnel is reduced;

7. the reactor pressure vessel main sealing surface measuring device is simple in structure and high in reliability of measuring results, and industrial safety and human error events in the operation process are effectively avoided.

Drawings

FIG. 1 is a schematic structural diagram of a reactor pressure vessel primary seal surface measuring device provided by the invention;

FIG. 2 is a schematic view illustrating the installation of a locking nut and a supporting seat in the primary sealing surface measuring device of a reactor pressure vessel according to the present invention;

FIG. 3 is a schematic structural diagram of a support seat of the apparatus for measuring a primary sealing surface of a reactor pressure vessel according to the present invention;

fig. 4 is a schematic structural diagram of a lock nut in a reactor pressure vessel primary sealing surface measuring device provided by the invention.

In the figure: 1. a measuring instrument; 2. a measuring instrument fixing rod; 3. locking the nut; 4. a retractable gauge head; 5. a supporting seat; 6. a V-shaped sealing groove; 7. a sealing surface; 8. an inner conical surface; 9. an expansion joint process hole; 10. an outer conical surface; 11. a support external thread; 12. an arc-shaped block; 13. and locking the internal thread of the nut.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the present invention provides a reactor pressure vessel primary sealing surface measuring apparatus, including: the device comprises a measuring instrument 1, a measuring instrument fixing rod 2, a locking nut 3, a telescopic measuring instrument head 4 and a supporting seat 5; the bottom of the measuring instrument 1 is connected with a telescopic measuring instrument head 4, and the measuring instrument 1 is fixedly connected to the upper part of a measuring instrument fixing rod 2; the locking nut 3 is sleeved on the supporting seat 5, and the locking nut 3 is in adjustable connection with the supporting seat 5; inside supporting seat 5 was located to the lower part of measuring instrument dead lever 2, measuring instrument dead lever 2 passed through lock nut 3 fixed connection with supporting seat 5, and scalable measuring gauge outfit 4 is stretched out by the bottom of supporting seat 5.

As shown in fig. 2-3, the supporting seat 5 is made of stainless steel, and includes a base, a supporting rod, an outer conical surface 10, an expansion joint fabrication hole 9, a supporting seat external thread 11 and an arc-shaped block 12. The bracing piece is located the central point of base upper surface perpendicularly and is put, bracing piece and base welded connection, the inside cavity that vertically link up that is equipped with of bracing piece, and the base correspondence is equipped with the round hole, and the cavity of bracing piece link up with the round hole on the base. The external conical surface 10 is arranged at the top of the support rod, and the external conical surface 10 is uniformly provided with conical surfaces of four expansion joints at intervals and is in a cross-shaped symmetrical structure; the inner surface of the outer conical surface 10 forms an expansion joint technical hole 9, and the expansion joint technical hole 9 is communicated with the cavity of the support rod. The lower part of the measuring instrument fixing rod 2 is arranged in an expansion joint process hole 9 of the supporting seat 5, and the measuring instrument fixing rod 2 is fixedly connected with the supporting seat 5 through extrusion of an inner conical surface 8 of the locking nut 3 on an outer conical surface 10 of the supporting seat 5. The four expansion joints provide enough flexibility for the process holes 9 of the expansion joints, and the strength of the metal material is ensured, so that the process holes 9 of the expansion joints can ensure the firmness of the fixed rods 2 of the measuring instruments when being clamped.

The external thread 11 of the support is arranged on the outer surface of the support rod and is positioned below the external conical surface 10.

Two arc blocks 12 are symmetrically arranged at two ends of the lower surface of the base, the arc blocks 12 are connected with the base in a welding mode, so that the bottom of the supporting base 5 is a supporting point which is the arc blocks 12 with two symmetry, a semi-open structure is formed, and the telescopic measuring gauge outfit 4 extends out of the bottom of the base of the supporting base 5. The base of supporting seat 5 makes things convenient for the survey crew to observe the measured position with the semi-open structure of arc piece 12 formation, guarantees that the measured position is accurate, avoids moving repeatedly and causes data error. The arc-shaped block 12 is designed in an arc shape, and under the condition of the same width, the contact area of the arc-shaped structure is larger than that of a rectangle, so that the stability of the measuring device in measuring is ensured.

As shown in fig. 2 and 4, the locking nut 3 is made of stainless steel and comprises an inner conical surface 8 and a locking nut internal thread 13, the inner conical surface 8 is arranged at the upper part of the inner surface of the locking nut 3, the inner conical surface 8 is an integrated conical surface, and the inner conical surface 8 is matched with the outer conical surface 10; the lower part of 3 internal surfaces of lock nut is located to lock nut internal thread 13, is located below interior conical surface 8, and lock nut internal thread 13 cooperatees with support external screw thread 11, and on the bracing piece of supporting seat 5 was located to lock nut 3 cover, lock nut 3 passed through screw-thread fit with the bracing piece of supporting seat 5 and is connected.

The inner conical surface 8 is a circle of smooth conical surface, so that smooth matching of the inner conical surface 8 and the outer conical surface 10 is ensured in the screwing process of the locking nut 3, and the blocking phenomenon is avoided.

The conical surface direction of the inner conical surface 8 is opposite to the conical surface 10 outside the supporting seat, and in the process of screwing the locking nut 3, a downward pressing force is provided for the inner conical surface 8 by matching the locking nut internal thread 13 with the support external thread 11, so that a downward acting force is provided for the inner conical surface 8; when the inner conical surface 8 is contacted with the outer conical surface 10 of the supporting seat, the outer conical surface 10 of the supporting seat is inwards extruded by the acting force under the matching of the conical surfaces, so that the process hole 9 of the expansion joint is driven to inwards shrink, and the fixed rod 2 of the measuring instrument is tightly held.

As shown in fig. 1, taking the measurement of the size of the V-shaped seal groove of the primary seal surface of the reactor pressure vessel as an example, the specific process of the measurement using the primary seal surface measuring device of the reactor pressure vessel of the present invention is as follows:

and (1) loosening the locking nut 3, separating the inner conical surface 8 of the locking nut 3 from the outer conical surface 10 of the supporting seat 5, and enabling the pressure acting on the outer conical surface 10 to be zero, so that the compressed expansion joint process hole 9 is loosened and restored to a free relaxation state.

Inserting a measuring instrument fixing rod 2 connected with a measuring instrument 1 from the head of the locking nut 3, and enabling the measuring instrument fixing rod 2 to penetrate into an expansion joint process hole 9; when the measuring instrument fixing rod 2 is positioned in the expansion joint technical hole 9, the measuring instrument telescopic measuring instrument head 4 extends out of the lower part of the base of the supporting seat 5.

Step (3), screwing the locking nut 3 clockwise, and moving the locking nut 3 downwards under the matching of the external thread 11 of the support and the internal thread 13 of the locking thread; at this time, the inner conical surface 8 of the locking nut 3 is in contact with the outer conical surface 10 of the supporting seat 5, and along with the continuous screwing of the locking nut 3, the pressure exerted on the outer conical surface 10 of the supporting seat 5 by the inner conical surface 8 of the locking nut 3 is increased, the outer conical surface 10 contracts inwards, and the expansion joint process hole 9 of the supporting seat 5 contracts together. After the process hole 9 of the expansion joint contracts, the fixed rod 2 of the measuring instrument is tightly held, so that the fixed rod is firmly fixed on the supporting seat 5, and the installation of the measuring device for the main sealing surface of the reactor pressure vessel is completed.

And (4) placing the installed reactor pressure vessel main sealing surface measuring device on the horizontal sealing surface 7, so that the arc blocks 12 at the bottom of the supporting seat 5 are all contacted with the horizontal sealing surface 7 and do not shake. The measuring device 1 now has a value which is displayed when the measuring device retractable measuring tip 4 is compressed by contact with the horizontal sealing surface 7. The measuring device 1 is then zeroed.

And (5) moving the reactor pressure vessel main sealing surface measuring device with the measuring instrument 1 returned to zero to a V-shaped sealing groove 6 needing to be measured, and observing that the telescopic measuring gauge head 4 of the measuring instrument 1 is in a correct measuring position (in the middle of the V-shaped sealing groove 6) from an open area at the bottom of the supporting seat 5. At this time, the arc-shaped block 12 of the support seat 5 is stabilized by hand, so that the whole support seat 5 is stable and does not shake, and then the reading of the measuring instrument 1 is observed. And repeating the steps to measure other positions needing to be measured, and accurately measuring the size of the V-shaped seal groove of the main seal surface, the protruding amount of the nickel gasket in the V-shaped seal groove and the indentation size of the pressure vessel top cover to finish the measurement of the main seal surface of the reactor pressure vessel.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.