Heat insulation sleeve assembly of magnetic lifting type control rod driving mechanism

Abstract

The invention belongs to the technical field of control rod driving mechanisms, and particularly relates to a heat insulation sleeve assembly of a magnetic lifting type control rod driving mechanism. Comprising a tube seat, a guide sleeve and a guide cover. The lower portion of the tube base is a second end. The first end is larger than the second end in radial dimension. A first connecting end is arranged on the lower portion of the second end, and the guide sleeve is fixedly connected with the first connecting end of the tube seat. A fourth connecting end is arranged on the upper portion of the guide cover, a horn cover is arranged on the lower portion of the guide cover, and the fourth connecting end of the guide cover is fixedly connected with the second fixing end of the guide sleeve. The heat insulation sleeve assembly has the advantages that the heat insulation sleeve assembly is in a fixed state, and the problem of movable abrasion of the heat insulation sleeve assembly is solved fundamentally.

Description

Technical Field

[0001] The present invention belongs to the technical field of control rod drive mechanisms, and particularly relates to a heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism. Background Art

[0002] The drive mechanism is a servo mechanism of the reactor control and protection system, which can drive the control rod to move up and down according to a given command, so as to realize functions such as reactor startup, power regulation, power maintenance, normal shutdown and accident shutdown of the reactor. As one of the functional components of the drive mechanism, the heat insulation sleeve assembly usually consists of a heat insulation sleeve and a guide cover. When the drive mechanism is operating, due to the high temperature of the liquid in the pressure vessel and the low temperature of the coolant inside the drive mechanism, natural convection heat transfer occurs between the two liquids, and this process is called "thermal siphon convection", which is also the main reason for the wear of the heat insulation sleeve assembly. In order to improve the service life of the drive mechanism, it is usually necessary to suppress this phenomenon. The heat insulation sleeve assembly reduces the gap between the drive mechanism and the seal housing, and increases the resistance of the pressure vessel fluid flowing towards the drive mechanism, and has a significant inhibitory effect on the thermal siphon convection phenomenon. In addition, the heat insulation sleeve assembly also has functions such as reducing the temperature difference between the inside and outside of the nozzle wall, squeezing water upward when the rod drops, and guiding the drive rod assembly into the control rod drive mechanism.

[0003] At present, contact wear occurs between the end of the heat insulation sleeve assembly and the seal housing under the action of cooling bypass flow. After wearing to a certain extent, the heat insulation sleeve will break and fall off, resulting in a rod jamming accident. The Chinese utility model patent with the publication number CN219349804U discloses a reactor guide heat insulation sleeve that is easy to replace, and an auxiliary support for the heat insulation sleeve is added by installing a compensation section (i.e., a spacer block) to prevent it from falling off. The Chinese invention patent with the publication number CN117476255A discloses a maintenance and replacement type heat insulation sleeve for a control rod drive mechanism. The nozzle and the heat insulation sleeve are separated, and the two are connected through a support seat and an installation nozzle, making the heat insulation sleeve easier to replace.

[0004] However, in the above two technical solutions, the heat insulation sleeve is still in a movable state, and the technical problem of heat insulation sleeve wear has not been fundamentally solved. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism, which can solve the technical problem that the heat insulation sleeve assembly is easily worn during the operation of the drive mechanism in the prior art.

[0006] The technical solution of the present invention is as follows: A heat insulation sleeve assembly of a magnetic force lifting type control rod drive mechanism includes a pipe seat, a guide sleeve, and a guide cover. The upper part of the pipe seat is the first end, and the lower part is the second end. A first connection end is arranged at the lower part of the second end. The guide sleeve is fixedly connected to the first connection end of the pipe seat. The upper part of the guide cover is provided with a fourth connection end, and the lower part is provided with a bell mouth. The fourth connection end of the guide cover is connected to the second fixed end of the guide sleeve.

[0007] The guide sleeve includes a first fixed end. Inside the first fixed end, a number of limiting columns II are arranged along the vertical up and down direction, and a drainage groove is formed between the limiting columns II.

[0008] The inner side surface of the limiting column II is set to be arc-shaped, and the arc radius is the same as the maximum radial dimension of the drive rod.

[0009] The guide sleeve and the pipe seat are fixedly connected by threads.

[0010] A through guide groove is radially opened at the lower end of the pipe seat. An anti-rotation ring is sleeved on the upper part of the guide sleeve, and the guide sleeve is fixedly connected to the anti-rotation ring. A lug adapted to the guide groove is arranged on the upper part of the anti-rotation ring, and the guide groove and the lug are coupled.

[0011] The guide sleeve and the anti-rotation ring are fixedly connected by welding.

[0012] Limiting columns I are arranged along the vertical up and down direction inside the second end of the pipe seat.

[0013] The limiting columns II are arranged circumferentially and uniformly.

[0014] The number of the limiting columns I is the same as that of the limiting columns II.

[0015] The pipe seat, the guide sleeve, and the guide cover are made of the same metal material.

[0016] The radial dimension of the first end is larger than that of the second end.

[0017] The beneficial effects of the present invention are as follows: Compared with the prior art, the heat insulation sleeve assembly of the present invention is in a fixed state, fundamentally solving the problem of wear due to the movement of the heat insulation sleeve assembly. At present, the reactor is gradually developing towards a small reactor. The heat insulation sleeve assembly of the present invention has a more compact structure and is more adaptable to a small reactor. While ensuring the smooth dropping of the drive rod, the radial support of the drive rod is strengthened, and the service life of the device is extended. Brief Description of the Drawings

[0018] Figure 1 It is a three-dimensional view of a heat insulation sleeve assembly of a magnetic force lifting type control rod drive mechanism provided by the present invention;

[0019] Figure 2Is a perspective view of the pipe seat;

[0020] Figure 3 Is a perspective view of the anti-rotation ring;

[0021] Figure 4 Is a cross-sectional view of the internal structure of the heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism provided by the present invention;

[0022] Figure 5 Is a perspective view of the guide sleeve;

[0023] Figure 6 Is Figure 5 The partial view at position A in

[0024] In the figure: 1 pipe seat, 2 anti-rotation ring, 3 guide sleeve, 4 guide cover, 11 first end, 12 second end, 13 guide groove, 14 first connection end, 15 first limit post, 21 second connection end, 22 lug, 31 first fixed end, 32 second fixed end, 33 third connection end, 34 second limit post, 35 drain groove, 41 fourth connection end, 42 bell mouth. Specific embodiments

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In order to make the technical solutions and advantages of the present invention clearer and easier to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "horizontal", "vertical", etc. indicating orientation or position relationship used in the following description are based on the orientation or position relationship shown in the accompanying drawings. These terms are only used to more conveniently describe the present invention here, rather than specifying the specific orientation or position during the implementation of the device, that is, these terms cannot be understood as limiting the present invention.

[0027] In the first embodiment of the present invention, as Figures 1-6 shown, a heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism of the present invention includes a pipe seat 1, a guide sleeve 3, and a guide cover 4. The upper part of the pipe seat 1 is the first end 11, and the lower part is the second end 12. The first end 11 is fixedly connected to the sealing shell of the drive mechanism, and the radial dimension of the first end 11 is larger than that of the second end 12. The lower part of the second end 12 is provided with a first connection end 14, and the guide sleeve 3 is fixedly connected to the first connection end 14 of the pipe seat 1. The upper part of the guide cover 4 is provided with a fourth connection end 41, and the lower part is provided with a bell mouth 42. The fourth connection end 41 of the guide cover 4 is fixedly connected to the second fixed end 32 of the guide sleeve 3.

[0028] A drive rod is installed inside the heat insulation sleeve assembly of the magnetic lifting type control rod drive mechanism. The drive rod is slidably connected to the heat insulation sleeve assembly in the vertical direction, and the sliding process of the drive rod is guided.

[0029] In another embodiment, in order to improve the interchangeability of the heat insulation sleeve assembly, the guide sleeve 3 and the pipe seat 1 are fixedly connected by threads. To prevent the guide sleeve 3 from falling off during use, a through guide groove 13 is radially formed at the lower end of the pipe seat 1. An anti-rotation ring 2 is sleeved on the upper part of the guide sleeve 3, and the guide sleeve 3 is fixedly connected to the anti-rotation ring 2. An ear 22 adapted to the guide groove 13 is provided on the upper part of the anti-rotation ring 2, and the guide groove 13 and the ear 22 are coupled.

[0030] Furthermore, the guide sleeve 3 and the anti-rotation ring 2 are fixedly connected by welding.

[0031] In another embodiment, on the one hand, due to the existence of flow-induced vibration during the operation of the drive rod, the drive rod will vibrate continuously in the radial direction. At this time, it is necessary to reduce the gap between the drive rod and the guide sleeve 3 to suppress its radial vibration. On the other hand, it is necessary to increase the gap between the drive rod and the guide sleeve 3 to reduce the resistance brought by the fluid when the drive rod drops the rod.

[0032] In order to enable the heat insulation sleeve assembly to meet the above requirements at the same time, a second limiting post 34 is arranged inside the first fixed end 31 of the guide sleeve 3 in the up and down vertical directions, and a drainage groove 35 is naturally formed between the second limiting posts 34.

[0033] Preferably, the second limiting posts 34 are arranged circumferentially and uniformly.

[0034] Preferably, the inner side surface of the second limiting post 34 is set to be arc-shaped, and the arc radius is the same as the maximum radial dimension of the drive rod. At this time, the contact between the drive rod and the second limiting post 34 changes from line contact to surface contact, reducing the local stress of the second limiting post 34 and increasing the service life of the guide sleeve 3.

[0035] Furthermore, a first limiting post 15 is arranged inside the second end 12 of the pipe seat 1 in the up and down vertical directions.

[0036] Preferably, the first limiting posts 15 are arranged circumferentially and uniformly.

[0037] The number of the first limiting posts 15 is the same as that of the second limiting posts 34.

[0038] Preferably, in order to reduce the electrochemical corrosion of the bonding surface of different metal materials, the pipe seat 1, the guide sleeve 3, and the guide cover 4 are made of the same metal material.

[0039] Finally, it should be noted that the above embodiments only represent several implementation manners of the present invention. For those of ordinary skill in the art, without departing from the concept of the present invention, several combinations and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A heat insulation sleeve assembly of a magnetic force lifting type control rod drive mechanism, characterized in that: It includes a socket (1), a guiding sleeve (3), and a guiding cover (4). The upper part of the socket (1) is the first end (11), and the lower part is the second end (12). A first connecting end (14) is arranged at the lower part of the second end (12). The guiding sleeve (3) is fixedly connected to the first connecting end (14) of the socket (1). The upper part of the guiding cover (4) is provided with a fourth connecting end (41), and the lower part is provided with a horn-shaped cover (42). The fourth connecting end (41) of the guiding cover (4) is connected to the second fixed end (32) of the guiding sleeve (3).

2. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 1, characterized in that: The guiding sleeve (3) includes a first fixed end (31). Inside the first fixed end (31), a number of second limiting columns (34) are arranged vertically in the up and down direction. Drainage grooves (35) are formed between the second limiting columns (34).

3. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 2, characterized in that: The inner side surface of the second limiting column (34) is set to be arc-shaped, and the arc radius is the same as the maximum radial dimension of the driving rod.

4. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 2 or 3, characterized in that: The guiding sleeve (3) and the socket (1) are fixedly connected by threads.

5. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 2, characterized in that: A through guiding groove (13) is radially opened at the lower end of the socket (1). An anti-rotation ring (2) is sleeved on the upper part of the guiding sleeve (3). The guiding sleeve (3) is fixedly connected to the anti-rotation ring (2). The upper part of the anti-rotation ring (2) is provided with lugs (22) adapted to the guiding groove (13), and the guiding groove (13) and the lugs (22) are coupled.

6. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 5, characterized in that: The guiding sleeve (3) and the anti-rotation ring (2) are fixedly connected by welding.

7. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 5, characterized in that: Inside the second end (12) of the socket (1), first limiting columns (15) are arranged vertically in the up and down direction.

8. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 2, characterized in that: The second limiting columns (34) are arranged circumferentially and evenly.

9. The heat insulation sleeve assembly of a magnetic lifting type control rod drive mechanism according to claim 7, characterized in that: The number of the first limiting columns (15) is the same as that of the second limiting columns (34).

10. The heat insulation sleeve assembly of the magnetic force lifting type control rod drive mechanism according to claim 1, characterized in that: The socket (1), the guiding sleeve (3), and the guiding cover (4) are made of the same metal material.

11. The heat insulation sleeve assembly of the magnetic lifting type control rod drive mechanism according to claim 1, characterized in that: The radial dimension of the first end (11) is larger than that of the second end (12).

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