Thermal sleeve device

Abstract

The present invention discloses a thermal sleeve device, which includes a thermal sleeve, a one-way water flow unit, and a fixing unit; the thermal sleeve has a first end and a second end that are connected, and the first end of the heat pipe sleeve is used to be inserted into the CRDM socket; the one-way water flow unit is arranged between the outer periphery of the first end of the thermal sleeve and the inner wall of the CRDM socket; the fixing unit is fixed on the second end of the thermal sleeve and supported below the CRDM socket, so that the thermal sleeve and the CRDM socket are relatively fixed. In the thermal sleeve device of the present invention, the thermal sleeve and the CRDM socket are relatively fixed through the fixing unit, avoiding wear between the thermal sleeve and the CRDM socket due to rotation, movement, etc. At the same time, a one-way water flow unit is arranged between the thermal sleeve and the CRDM socket to meet the functional requirements of the thermal sleeve.

Description

Technical Field

[0001] The present invention relates to an in-core structure of a reactor, and particularly to a thermal sleeve device. Background Art

[0002] The thermal sleeve is located in the socket of the control rod drive mechanism (CRDM) on the top cover of the pressure vessel, between the control rod drive rod and the CRDM socket. The thermal sleeve flange sits on the CRDM socket by its own weight, and a bell mouth is installed at the lower end to ensure that the control rod drive rod can smoothly enter the thermal sleeve when the top cover of the pressure vessel is hoisted.

[0003] The thermal sleeve belongs to a part of the control rod drive line, and its main functions are as follows: when the control rod drive rod is not moving, it restricts the hot fluid in the reactor top cover chamber from entering the CRDM to protect the CRDM coil; when the control rod drive rod lifts the rod, the cold fluid in the CRDM flows downward along the gap between the thermal sleeve and the control rod drive rod, preventing the fluid from flowing downward between the thermal sleeve and the CRDM, protecting the weld between the CRDM socket and the top cover of the pressure vessel, and avoiding thermal fatigue; when the control rod drive rod drops the rod, the thermal sleeve lifts under the action of the pressure difference, allowing the fluid to flow upward between the thermal sleeve and the CRDM socket, reducing the fluid resistance of the control rod drive rod and shortening the rod dropping time.

[0004] After long-term operation of the thermal sleeve, wear will occur between the thermal sleeve flange and the CRDM socket. In severe cases of wear, the thermal sleeve flange will be completely worn through, and foreign objects will be formed in the socket by the thermal sleeve flange, affecting the movement of the control rod drive rod and resulting in jamming of the control rod drive rod.

[0005] In view of the above problems, a existing solution is to adopt a movable thermal sleeve. The thermal sleeve sits on the CRDM socket by gravity, and the thermal sleeve is allowed to move up and down, swing left and right, and rotate axially. Wear will occur between the thermal sleeve and the CRDM socket. During the operation of the unit, the wear amount of the thermal sleeve is checked, and after reaching the wear criterion, the thermal sleeve is repaired or replaced. This solution has the following defects: after the thermal sleeve is completely worn, it may cause the control rod to jam when dropping the rod, affecting the operation safety of the unit; it is necessary to regularly check the wear condition of the thermal sleeve, and evaluate whether it can continue to operate according to the inspection situation. The inspection occupies the critical path of the major overhaul, and the operation and maintenance cost is high; it is difficult to repair and replace the thermal sleeve, and the repair and replacement cost is high.

[0006] Another existing solution also adopts a movable thermal sleeve. The thermal sleeve flange is composed of two half rings and a support ring. This structural design facilitates the replacement of the thermal sleeve. When the thermal sleeve needs to be replaced due to wear, the thermal sleeve is lifted, and then the two half rings and the support ring can be taken out in sequence. This solution has the following defects: it is necessary to regularly check the wear condition of the thermal sleeve, and evaluate whether it can continue to operate according to the inspection situation. The inspection occupies the critical path of the major overhaul, and the operation and maintenance cost is high; the service life of the thermal sleeve is short, and the replacement frequency is high. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a thermal sleeve device that reduces the wear problem between the thermal sleeve and the CRDM socket.

[0008] The technical solution adopted by the present invention to solve its technical problems is: to provide a thermal sleeve device, including a thermal sleeve, a one-way water flow unit, and a fixing unit;

[0009] The thermal sleeve has a first end and a second end connected to each other. The first end of the thermal sleeve is used to penetrate into the CRDM socket; the one-way water flow unit is arranged between the outer periphery of the first end of the thermal sleeve and the inner wall of the CRDM socket;

[0010] The fixing unit is fixed on the second end of the thermal sleeve and supported below the CRDM socket, so that the thermal sleeve and the CRDM socket are relatively fixed.

[0011] Preferably, the thermal sleeve includes a pipe body, a flange, and a bell mouth; the pipe body has a first end and a second end connected to each other. The flange is arranged on the outer periphery of the end of the first end of the pipe body, and the bell mouth is sleeved on the end of the second end of the pipe body;

[0012] The one-way water flow unit is sleeved on the first end of the pipe body and is pressed by the flange between the outer periphery of the first end of the pipe body and the inner wall of the CRDM socket;

[0013] The fixing unit is fixed on the second end of the pipe body.

[0014] Preferably, the one-way water flow unit includes an annular body and a plurality of groups of one-way flow channels arranged at intervals along the circumference of the annular body.

[0015] Preferably, the annular body has a first surface and a second surface opposite to each other, and the second surface faces the second end of the thermal sleeve;

[0016] The one-way flow channel includes a first water flow hole penetrating the opposite first surface and second surface of the annular body, a second water flow hole communicating with the first water flow hole and penetrating the first surface of the annular body, and a sphere movably arranged in the first water flow hole;

[0017] The second water flow hole is located on the side of the first water flow hole away from the central axis of the annular body.

[0018] Preferably, the inner diameter of the end of the first water flow hole close to the second surface is smaller than the diameter of the sphere; the connection part of the second water flow hole and the first water flow hole is located above the end of the first water flow hole close to the second surface.

[0019] Preferably, the annular body has opposite first and second surfaces, and the second surface faces the second end of the thermal sleeve;

[0020] The unidirectional flow channel includes a water flow hole penetrating the opposite first and second surfaces of the annular body, and a check valve piece disposed in the water flow hole.

[0021] Preferably, the fixing unit includes a first snap ring engaged with the end of the CRDM socket, a second snap ring sleeved and fixed on the outer periphery of the second end of the thermal sleeve, and a plurality of connecting columns;

[0022] The plurality of connecting columns are circumferentially spaced apart along the first snap ring and the second snap ring and are connected between the first snap ring and the second snap ring.

[0023] Preferably, the diameter of the first snap ring is greater than the diameter of the second snap ring;

[0024] Each connecting column includes a first connecting section connecting the inner ring of the first snap ring and extending radially along the first snap ring, and a second connecting section connected to the end face of the second snap ring facing the first snap ring; the second connecting section is perpendicular to the first connecting section.

[0025] Preferably, the first connecting section is attached to the end face of the end of the CRDM socket; the inner side surface of the second connecting section is attached to the outer peripheral surface of the second end of the thermal sleeve.

[0026] Preferably, the outer side surface of the second connecting section is flush with the outer peripheral surface of the second snap ring.

[0027] Preferably, the second snap ring is fixed on the outer periphery of the second end of the thermal sleeve by at least one of welding, threading, and a positioning pin.

[0028] The beneficial effects of the present invention: The fixing unit relatively fixes the thermal sleeve and the CRDM socket, avoiding wear between the thermal sleeve and the CRDM socket due to rotation, movement, etc. At the same time, a unidirectional water flow unit is provided between the thermal sleeve and the CRDM socket to meet the functional requirements of the thermal sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0030] Figure 1 is a schematic cross-sectional structure diagram of the thermal sleeve device of an embodiment of the present invention when cooperating with the control rod drive rod to drop the rod;

[0031] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0032] Figure 3 Schematic cross-sectional structure diagram when the heat sleeve device of an embodiment of the present invention cooperates with the control rod drive rod to lift the rod;

[0033] Figure 4 is Figure 3 Enlarged structure diagram of part B in

[0034] Figure 5 Schematic structure diagram of the unidirectional flow unit in the heat sleeve device of an embodiment of the present invention in one direction;

[0035] Figure 6 Schematic structure diagram of the unidirectional flow unit in the heat sleeve device of an embodiment of the present invention in the other direction;

[0036] Figure 7 Schematic structure diagram of the fixing unit in the heat sleeve device of an embodiment of the present invention. Detailed implementation manners

[0037] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] Such as Figure 1 , 3 shown, the heat sleeve device of the first embodiment of the present invention includes a heat sleeve 10, a unidirectional flow unit 20, and a fixing unit 30.

[0039] Along the axial direction of the heat sleeve 10, the heat sleeve 10 has a first end and a second end that are connected. The first end of the heat sleeve 10 is used to penetrate into the CRDM socket 40. The unidirectional flow unit 20 is arranged between the outer periphery of the first end of the heat sleeve 10 and the inner wall of the CRDM socket 40, and functions to restrict the fluid flow direction. The fixing unit 30 is fixed on the second end of the heat sleeve 10 and supported below the CRDM socket 40, so that the heat sleeve 10 and the CRDM socket 40 are relatively fixed, thereby preventing wear caused by activities such as rotation or movement between the heat sleeve 10 and the CRDM socket 40.

[0040] When the heat sleeve 10 is installed and used, it penetrates into the CRDM socket 40 along the axial direction of the CRDM socket 40, and the first end of the heat sleeve 10 is located inside the CRDM socket 40, and the second end is located below the CRDM socket 40.

[0041] The thermal sleeve 10 may further include a tube body 11, a flange 12, and a bell mouth 13. The tube body 11 has a first end 111 and a second end 112 that are joined, and at the same time, form the first end and the second end of the thermal sleeve 10. The flange 12 is provided on the outer periphery of the end of the first end 111 of the tube body 11, and may be integrally formed on the end of the first end 111 specifically. The bell mouth 13 is sleeved on the end of the second end 112 of the tube body 11, and the opening of the bell mouth 13 faces downward to ensure that the control rod drive rod can smoothly enter the thermal sleeve 10 from below when the pressure vessel top cover is hoisted.

[0042] The one-way flow unit 20 is sleeved on the first end 111 of the tube body 11 and is pressed between the outer periphery of the first end 111 of the tube body 11 and the inner wall of the CRDM tube seat 40 by the flange 12. The outer peripheral surface of the one-way flow unit 20 fits against the inner wall of the CRDM tube seat 40 to ensure that there is no gap or the gap is as small as possible between the two.

[0043] Since the thermal sleeve 10 is relatively fixed to the CRDM tube seat 40 through the fixing unit 30, in order to ensure the normal flow of fluid when the control rod drive rod 50 drops and lifts the rod, by providing the one-way flow unit 20 between the thermal sleeve 10 and the CRDM tube seat 40, the flow direction of the fluid is controlled. Among them:

[0044] As Figure 1 、 2 shown, when the control rod drive rod 50 drops the rod, due to the pressure difference, the one-way flow unit 20 opens, and the fluid flows upward from the gap between the thermal sleeve 10 and the CRDM tube seat 40, and the fluid flow direction is as shown by the arrow in Figure 1 、 2 .

[0045] As Figure 3 、 4 shown, when the control rod drive rod 50 lifts the rod, the one-way flow unit 20 closes, and the fluid flows downward from the interval between the thermal sleeve 10 and the control rod drive rod 50, and the fluid flow direction is as shown by the arrow in Figure 3 、 4 .

[0046] Combined with Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , in the embodiment, the one-way flow unit 20 includes an annular body 21 and a plurality of groups of one-way flow channels 22 arranged at intervals along the circumferential direction of the annular body 21. The annular body 21 has opposite first and second surfaces, and the second surface faces the second end of the thermal sleeve 10. The one-way flow channels 22 are used to achieve the one-way flow of the fluid.

[0047] In an embodiment, the one-way flow channel 22 further includes a first water flow hole 221, a second water flow hole 222, and a sphere 223. The first water flow hole 221 penetrates through the opposite first surface and second surface of the annular body 21; the second water flow hole 222 is connected to the first water flow hole 221 and penetrates through the first surface of the annular body 21, that is, one end of the second water flow hole 222 is connected to the first water flow hole 221 inside the annular body 21, and the other end penetrates through the first surface of the annular body 21. The second water flow hole 222 is located on the side of the first water flow hole 221 away from the central axis of the annular body 21, that is to say, the second water flow hole 222 is located outside the first water flow hole 221.

[0048] The sphere 223 is movably arranged in the first water flow hole 221. By controlling the opening and closing of the first water flow hole 221 at different positions, the opening and closing of the one-way flow channel 22 is further controlled. The sphere 223 can preferably be a stainless steel ball.

[0049] When the control rod drive rod 50 drops the rod, due to the pressure difference, the sphere 223 moves upward and blocks the end of the first water flow hole 221 near the first surface. At this time, the first water flow hole 221 and the second water flow hole 222 are connected, and the second water flow hole 222 is connected to the gap between the thermal sleeve 10 and the CRDM socket 40 through the opening of the first water flow hole 221 on the second surface, that is, the one-way flow channel 22 of the one-way water flow unit 20 is opened, and the fluid flows upward from the gap between the thermal sleeve 10 and the CRDM socket 40.

[0050] When the control rod drive rod 50 raises the rod, the sphere 223 moves downward under the action of gravity and blocks the end of the first water flow hole 221 near the second surface, closing the one-way flow channel 22 of the one-way water flow unit 20, and the fluid flows downward from the interval between the thermal sleeve 10 and the control rod drive rod 50.

[0051] Understandably, in order to enable the sphere 223 to move within the first water flow hole 221, the inner diameter of the first water flow hole 221 is set slightly larger than the diameter of the sphere 223. Since the upper part of the unidirectional water flow unit 20 (the side facing away from the second end of the heat sleeve 10) is pressed by the flange 12, the first surface of the annular body 21 abuts against the flange 12. Further, the opening of the first water flow hole 221 on the first surface abuts below the flange 12 (covered by the flange 12), and the opening of the second water flow hole 222 on the first surface is outside the flange 12 (not covered by the flange 12). When the sphere 223 moves upward into the end of the first water flow hole 221 close to the first surface, the sphere 223 is restricted by the flange 12 at the same time and will not come out of the first water flow hole 221. The opening of the first water flow hole 221 on the second surface directly communicates with the gap between the heat sleeve 10 and the CRDM socket 40. In order to prevent the sphere 223 from moving downward under the action of gravity and blocking the end of the first water flow hole 221 close to the second surface without coming out of the first water flow hole 221, the inner diameter of the end of the first water flow hole 221 close to the second surface is smaller than the diameter of the sphere 223 to restrict the sphere 223 within this end.

[0052] The connection between the second water flow hole 222 and the first water flow hole 221 can be located above the end of the first water flow hole 221 close to the second surface.

[0053] Furthermore, in this embodiment, as Figure 2 and Figure 5 shown, the second water flow hole 222 is connected to the first water flow hole 221 through a horizontally arranged hole. During the manufacturing process, according to the integral structure of the annular body 21, in order to facilitate the setting of the first water flow hole 221 and the second water flow hole 222 connected to the first water flow hole 221 within the annular body 21, the horizontally arranged hole will inevitably penetrate the outer peripheral surface of the annular body 21 and form an opening on this outer peripheral surface. Between the heat sleeve 10 and the CRDM socket 40, the outer peripheral surface of the annular body 21 fits with the CRDM socket 40, and the gap between the two is very small or there is no gap. Therefore, the opening formed on the outer peripheral surface does not affect the fluid flow direction.

[0054] Of course, the annular body 21 can also be formed by a split structure combination, that is, it can be formed by two annular units that cooperate up and down. In this split structure mode, it is more convenient to set the first water flow hole 221 and the second water flow hole 222 connected to the first water flow hole 221 therein, and the horizontal hole connecting the first water flow hole 221 and the second water flow hole 222 can not penetrate the outer peripheral surface of the annular body 21.

[0055] In other embodiments, the one-way flow channel 22 can also be arranged according to the one-way valve principle, that is, it can include a water flow hole penetrating through the opposite first surface and second surface of the annular body 21, and a one-way valve piece arranged in the water flow hole. When the control rod drive rod 50 drops the rod, due to the pressure difference, the one-way valve piece opens, thereby opening the one-way flow channel 22, and the fluid flows upward through the gap between the thermal sleeve 10 and the CRDM tube seat 40. When the control rod drive rod 50 raises the rod, the one-way valve piece closes, thereby closing the one-way flow channel 22, and the fluid flows downward through the space between the thermal sleeve 10 and the control rod drive rod 50.

[0056] According to the structural composition of the thermal sleeve 10, the fixing unit 30 is fixed on the second end 112 of the tube body 11 of the thermal sleeve 10.

[0057] As Figure 3 and Figure 7 shown, the fixing unit 30 can include a first snap ring 31 snapped onto the end of the CRDM tube seat 40, a second snap ring 32 sleeved and fixed on the outer periphery of the second end of the thermal sleeve 10, and a plurality of connecting columns 33. The plurality of connecting columns 33 are circumferentially spaced along the first snap ring 31 and the second snap ring 32 and are connected between the first snap ring 31 and the second snap ring 32 to form an integral body.

[0058] Corresponding to the CRDM tube seat 40 being sleeved outside the thermal sleeve 10, the diameter of the first snap ring 31 is larger than the diameter of the second snap ring 32.

[0059] Corresponding to the different diameters of the first snap ring 31 and the second snap ring 32, each connecting column 33 can further include a first connecting section 331 connecting the first snap ring 31 and a second connecting section 332 connecting the second snap ring 32.

[0060] Specifically, the first connecting section 331 connects to the inner ring of the first snap ring 31 and extends along the radial direction of the first snap ring 31 towards the midline direction of the first snap ring 31. The second connecting section 332 is connected to the end face of the second snap ring 32 facing the first snap ring 31 and is perpendicularly connected to the first connecting section 331. The connecting column 33 formed by connecting the first connecting section 331 and the second connecting section 332 has an L-shaped structure.

[0061] The first connecting section 331 fits on the end face of the end of the CRDM tube seat 40; the inner side surface of the second connecting section 332 fits on the outer peripheral surface of the second end of the thermal sleeve 10. The outer side surface of the second connecting section 332 is flush with the outer peripheral surface of the second snap ring 32, improving the overall appearance integrity.

[0062] In the fixing unit 30, through the spaced distribution of the plurality of connecting columns 33, not only are the first snap ring 31 and the second snap ring 32 connected as a whole, but also a hollow structure is formed between them, so as not to affect the fluid entering between the thermal sleeve 10 and the CRDM tube seat 40, especially when the control rod drive rod 50 drops the rod.

[0063] Further, the fixing unit 30 fixes the thermal sleeve 10 and the CRDM socket 40 relative to each other. The first snap ring 31 cooperates with the end of the CRDM socket 40 in a snap-fitting manner, which can position it and limit the lateral displacement of the CRDM socket 40. The second snap ring 32 is sleeved on the outer periphery of the second end of the thermal sleeve 10 and fixed to the second end, so that the relative fixation of the thermal sleeve 10 and the CRDM socket 40 can be achieved by fixing the second snap ring 32 to the thermal sleeve 10.

[0064] As an option, the second snap ring 32 can be fixed to the outer periphery of the second end of the thermal sleeve 10 by at least one of welding, threading, and positioning pins.

[0065] Reference Figures 1-4 , when the thermal sleeve device of the present invention is installed and used, since the CRDM socket 40 is integrally formed on the top cover of the pressure vessel, first place the one-way flowing water unit 20 into the upper end inside the CRDM socket 40, then insert the thermal sleeve 10 (without the bellows 13) into the CRDM socket 40, and finally fix and assemble the thermal sleeve 10 and the CRDM socket 40 together through the fixing unit 30, and sleeve the bellows 13 on the end of the second end of the thermal sleeve 10. The CRDM (control rod drive mechanism of the pressure vessel top cover) is fitted on the CRDM socket 40.

[0066] Lift the thermal sleeve device together with the CRDM socket 40 above the reactor pressure vessel. Align and guide the control rod drive rod into the thermal sleeve 10 through the bellows 13 on the second end of the thermal sleeve 10 and enter the CRDM through the top of the thermal sleeve 10.

[0067] When the control rod drive rod 50 drops the rod, the thermal sleeve 10 is lifted under the pressure difference, the one-way flowing water unit 20 opens, allowing the fluid to flow upward through the gap between the thermal sleeve 10 and the CRDM socket 40, reducing the fluid resistance of the control rod drive rod 50 and reducing the rod dropping time.

[0068] When the control rod drive rod 50 raises the rod, the cold fluid in the CRDM flows downward along the gap between the thermal sleeve 10 and the control rod drive rod 50; the one-way flowing water unit 20 closes, preventing the fluid from flowing downward through the gap between the thermal sleeve 10 and the CRDM 40, protecting the weld between the CRDM socket 40 and the pressure vessel top cover and avoiding thermal fatigue.

[0069] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A thermal sleeve device, characterized in that, It includes a thermal sleeve, a one-way water flow unit and a fixing unit; The thermal sleeve has a first end and a second end that are connected. The first end of the thermal sleeve is used to penetrate through the CRDM socket; the one-way water flow unit is arranged between the outer periphery of the first end of the thermal sleeve and the inner wall of the CRDM socket; The fixing unit is fixed on the second end of the thermal sleeve and supported below the CRDM socket, so that the thermal sleeve and the CRDM socket are relatively fixed.

2. The thermal sleeve device according to claim 1, characterized in that, The thermal sleeve includes a pipe body, a flange and a bell mouth; the pipe body has a first end and a second end that are connected. The flange is arranged on the outer periphery of the end of the first end of the pipe body, and the bell mouth is sleeved on the end of the second end of the pipe body; The one-way water flow unit is sleeved on the first end of the pipe body and is pressed by the flange between the outer periphery of the first end of the pipe body and the inner wall of the CRDM socket; The fixing unit is fixed on the second end of the pipe body.

3. The thermal sleeve device according to claim 1, characterized in that, The one-way water flow unit includes an annular body and a plurality of groups of one-way flow channels arranged at intervals along the circumference of the annular body.

4. The thermal sleeve device according to claim 3, characterized in that, The annular body has opposite first and second surfaces, and the second surface faces the second end of the thermal sleeve; The one-way flow channel includes a first water flow hole penetrating through the opposite first and second surfaces of the annular body, a second water flow hole communicating with the first water flow hole and penetrating through the first surface of the annular body, and a sphere movably arranged in the first water flow hole; The second water flow hole is located on the side of the first water flow hole away from the central axis of the annular body.

5. The thermal sleeve device according to claim 4, characterized in that, The inner diameter of the end of the first water flow hole close to the second surface is smaller than the diameter of the sphere; the connection part of the second water flow hole and the first water flow hole is located above the end of the first water flow hole close to the second surface.

6. The thermal sleeve device according to claim 3, characterized in that, The annular body has opposite first and second surfaces, and the second surface faces the second end of the thermal sleeve; The one-way flow channel includes a water flow hole penetrating through the opposite first and second surfaces of the annular body and a one-way valve plate arranged in the water flow hole.

7. The thermal sleeve device according to any one of claims 1 - 6, characterized in that, The fixing unit includes a first snap ring clamped on the end of the CRDM socket, a second snap ring sleeved and fixed on the outer periphery of the second end of the thermal sleeve, and a plurality of connecting columns; A plurality of the connecting columns are distributed at intervals along the circumference of the first snap ring and the second snap ring and are connected between the first snap ring and the second snap ring.

8. The thermal sleeve device according to claim 7, characterized in that, The diameter of the first snap ring is larger than the diameter of the second snap ring; Each connecting column includes a first connecting section connecting the inner ring of the first snap ring and extending along the radial direction of the first snap ring, and a second connecting section connected to the end face of the second snap ring facing the first snap ring; the second connecting section is perpendicular to the first connecting section.

9. The thermal sleeve device according to claim 8, characterized in that, The first connecting section fits on the end face of the end of the CRDM socket; the inner side surface of the second connecting section fits on the outer peripheral surface of the second end of the thermal sleeve.

10. The thermal sleeve device according to claim 9, characterized in that, The outer side surface of the second connecting section is flush with the outer peripheral surface of the second snap ring.

11. The thermal sleeve device according to claim 7, characterized in that, The second snap ring is fixed on the outer periphery of the second end of the thermal sleeve by at least one of welding, threading and positioning pins.

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