Heat dissipation self-sealing structure for nuclear power plant and fan module

Abstract

The utility model provides a heat dissipation self-sealing structure for a nuclear power plant and a fan module, which belong to the technical field of electrical equipment and comprise an outer frame body, a blade group, a transmission assembly and a driving piece. The outer frame body is used for being installed at an air opening of a fan and is provided with an installation cavity penetrating in the airflow flowing direction. The blade group is arranged in the mounting cavity and comprises a plurality of blades which are distributed in parallel at intervals; the two ends of each blade are rotationally connected with the outer frame body. The transmission assembly is connected with each blade and is used for driving each blade to rotate; the power end of the driving piece is connected with the transmission assembly; and the driving piece is also electrically connected with the fan. When the fan fails and shuts down, the driving piece returns, the transmission assembly drives the blades to rotate, the blade set is in a closed state, at the moment, each blade is in lap joint with the adjacent blade to block the installation cavity and prevent hot air from entering the equipment through the installation cavity, and therefore hot air backflow is avoided, and normal heat dissipation and operation of the equipment are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical equipment, and more specifically, relates to a heat dissipation self - enclosed structure and a fan module for a nuclear power plant. Background Art

[0002] For electrical equipment mainly cooled by air, a heat dissipation method of using multiple fans for air extraction is adopted to improve the heat dissipation efficiency of the equipment. And under the condition of single - fan failure, the remaining fans will work normally without affecting the operation of the equipment.

[0003] In the prior art, when a single fan fails, there will be wind resistance at the air outlet of the failed fan, and the hot air cannot be discharged immediately. Instead, it will flow back from the blades and gaps of the failed fan and enter the equipment interior, affecting the heat dissipation and normal operation of the equipment. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a heat dissipation self - enclosed structure and a fan module for a nuclear power plant, aiming to solve the technical problem that hot air flows back into the equipment interior after the fan fails in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: providing a heat dissipation self - enclosed structure for a nuclear power plant, including:

[0006] An outer frame body, which is used to be installed at the air outlet of the fan; the outer frame body has an installation cavity that penetrates along the air flow direction;

[0007] A blade group, which is arranged in the installation cavity; the blade group includes a plurality of blades that are parallel and spaced apart; both ends of each blade are respectively rotatably connected to the outer frame body;

[0008] A transmission assembly, which is respectively connected to each blade and is used to drive each blade to rotate; and

[0009] A driving member, whose power end is connected to the transmission assembly; the driving member is also electrically connected to the fan;

[0010] Wherein, when the fan is working normally, the driving member and the transmission assembly drive the blade group to be in an open state, and there is a ventilation gap between each blade and the adjacent blade; when the fan stops operating, the driving member and the transmission assembly drive the blade group to be in a closed state, and each blade overlaps with the adjacent blade to block the installation cavity.

[0011] In a possible implementation manner, the transmission assembly includes:

[0012] A rotating shaft group is rotatably arranged on the side wall of the outer housing; the rotating shaft group includes a plurality of rotating shafts; the end of each blade is fixedly connected to a corresponding rotating shaft; and

[0013] A connecting rod structure is located outside the outer housing, the input end is connected to the power end of the driving member, and the output end is connected to each rotating shaft;

[0014] Wherein, the driving member is used to drive the input end of the connecting rod structure to move linearly and the output end to move rotationally, so as to rotate each rotating shaft.

[0015] In some embodiments, the connecting rod structure includes:

[0016] A straight rod, one end of which is connected to the power end of the driving member and is driven by the driving member to move linearly; and

[0017] A plurality of swing rods, corresponding to the plurality of rotating shafts one by one; one end of each swing rod is connected to the straight rod, and the other end is connected to the corresponding rotating shaft.

[0018] In some embodiments, the swing rod is a bent rod structure, and the two ends of the swing rod are staggeredly arranged.

[0019] In a possible implementation manner, the blade includes:

[0020] A cylindrical part, the two ends of which are respectively rotatably connected to the outer housing; and

[0021] A lapping part, which is connected to the cylindrical part; the lapping part has an arc-shaped lapping surface adapted to the outer peripheral surface of the cylindrical part; in the closed state, the arc-shaped lapping surface overlaps and laps with the outer peripheral surface of the cylindrical part.

[0022] In some embodiments, the blade further includes:

[0023] An intermediate straight plate part, which is connected between the cylindrical part and the lapping part.

[0024] In some embodiments, a notch is provided on the cylindrical part, and the notch penetrates along the rotational axial direction of the cylindrical part.

[0025] In some embodiments, the lapping part is an arc-shaped plate structure.

[0026] In a possible implementation manner, the outer housing is fixedly arranged at the air inlet of the blower.

[0027] The beneficial effects of a heat dissipation self - closing structure for nuclear power plants provided by the present utility model are as follows: Compared with the prior art, in the heat dissipation self - closing structure for nuclear power plants of the present utility model, an outer frame body is provided at the air outlet of the fan, and a blade group composed of a plurality of blades is provided in the installation cavity of the outer frame body. Since the fan is electrically connected to the driving member, when the fan is operating normally, the driving member and the transmission assembly drive the blade group to be in an open state. At this time, there is a ventilation gap between each blade and the adjacent blade, and the hot air is extracted by the fan. When the fan fails and stops operating, the driving member returns to its original position, drives each blade to rotate back through the transmission assembly, and makes the blade group in a closed state. At this time, each blade overlaps with the adjacent blade to block the installation cavity, so as to prevent the hot air from entering the interior of the equipment through the installation cavity, thereby avoiding the backflow of hot air and ensuring the normal heat dissipation and operation of the equipment.

[0028] The present utility model also provides a fan module, including:

[0029] A housing; and

[0030] At least two fans, which are arranged at intervals inside the housing; wherein, a heat dissipation self - closing structure for nuclear power plants as described above is provided at the air outlet of each fan.

[0031] For the fan module provided by the present utility model, since the heat dissipation self - closing structure for nuclear power plants as described above is installed at the air outlet of each fan, it can prevent the backflow of hot air into the interior of the equipment when the fan fails, and ensure the normal heat dissipation and operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of a heat dissipation self - closing structure for nuclear power plants provided by an embodiment of the present utility model;

[0034] Figure 2 It is a schematic connection structure diagram of the blade group and the transmission assembly of a heat dissipation self - closing structure for nuclear power plants provided by an embodiment of the present utility model (the blade group in the figure is in an open state);

[0035] Figure 3 It is a schematic structural diagram of a single blade of a heat dissipation self - closing structure for nuclear power plants provided by an embodiment of the present utility model;

[0036] Figure 4Schematic structural diagram of a transmission component of a heat dissipation self - enclosed structure for a nuclear power plant provided by an embodiment of the present utility model;

[0037] Figure 5 Schematic structural diagram of a fan module provided by an embodiment of the present utility model;

[0038] Figure 6 Schematic cross - sectional structure of a fan module provided by an embodiment of the present utility model Figure 1 (The blade group in the figure is in the open state);

[0039] Figure 7 Schematic cross - sectional structure of a fan module provided by an embodiment of the present utility model Figure 1 (The blade group in the figure is in the closed state).

[0040] In the figure: 1. Outer frame body; 2. Blade; 21. Cylindrical part; 211. Notch; 22. Lapping part; 221. Arc - shaped lapping surface; 23. Intermediate straight plate part; 3. Transmission component; 31. Rotating shaft; 32. Link structure; 321. Straight rod; 322. Swing rod; 4. Driving part; 5. Fan; 6. Housing. Specific embodiments

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0042] Please refer to Figures 1 to 7 , and now a heat dissipation self - enclosed structure for a nuclear power plant provided by the present utility model will be described. The heat dissipation self - enclosed structure for a nuclear power plant includes an outer frame body 1, a blade group, a transmission component 3 and a driving part 4. The outer frame body 1 is used to be installed at the air outlet of the fan 5; the outer frame body 1 has an installation cavity that penetrates along the air flow direction; the blade group is arranged in the installation cavity; the blade group includes a plurality of blades 2 that are parallel and spaced apart; both ends of each blade 2 are rotatably connected to the outer frame body 1 respectively; the transmission component 3 is connected to each blade 2 respectively and is used to drive each blade 2 to rotate; the power end of the driving part 4 is connected to the transmission component 3; the driving part 4 is also electrically connected to the fan 5.

[0043] Among them, when the fan 5 is working normally, the driving part 4 and the transmission component 3 drive the blade group to be in the open state, and there is a ventilation gap between each blade 2 and the adjacent blade 2; when the fan 5 stops running, the driving part 4 and the transmission component 3 drive the blade group to be in the closed state, and each blade 2 overlaps with the adjacent blade 2 to block the installation cavity.

[0044] The outer frame 1 is adapted to the structure at the air outlet of the fan 5 so as to completely wrap the air outlet, and hot air will not overflow from the edge of the outer frame 1. The above air outlet can be the air inlet of the fan 5 or the air outlet, that is to say, the outer frame 1 can be installed at the air inlet of the fan 5 or at the air outlet of the fan 5.

[0045] A plurality of blades 2 are respectively rotatably connected to the outer frame 1, and the rotation direction is perpendicular to the air flow direction. The rotation mode can adopt the shaft rotation common in the prior art.

[0046] The driving member 4 is the power source of the heat dissipation self-closed structure for a nuclear power plant; the driving member 4 is electrically connected and linked with the fan 5, and the two are jointly controlled by the controller to operate. When the fan 5 is working normally, the driving member 4 outputs power in the first direction, and when the fan 5 stops running, the driving member 4 outputs power in the second direction, where the first direction is opposite to the second direction. The driving member 4 can adopt the common power source structure in the prior art, such as one of an electric motor, a cylinder, and a hydraulic rod.

[0047] The transmission component 3 serves as an intermediate transmission for driving each blade 2 to rotate; the transmission component 3 can be a link transmission, or a chain transmission, a belt transmission, a gear transmission, etc. The specific structure of the transmission component 3 is not limited in this embodiment, as long as it can drive each blade 2 to rotate.

[0048] It should be noted that since the blade group only needs to switch between the open state and the closed state, each blade 2 only needs to rotate at a small angle. Preferably, the rotation angle is between 0 - 45°, and there is no need for a full-circle rotation. Correspondingly, the moving stroke of the transmission component 3 is also small.

[0049] In the prior art, in order to improve the heat dissipation effect, multiple fans 5 are assembled to the equipment. For the air flow mode of lower air inlet and upper air outlet, due to the limitation of the installation position of the fan 5, there is a certain distance between the fan 5 and the top wall of the equipment housing 6. When a single fan 5 fails, a wind resistance will be formed above the fan 5, and the hot air cannot be discharged immediately. In a short period of time, a large amount of hot air will accumulate between the fan 5 and the top wall of the equipment housing 6, and the hot air extracted by the normally working fan 5 will also gather here, resulting in the hot air flowing back from the blades 2 and gaps of the failed fan 5 and entering the equipment interior.

[0050] To solve the above technical problems, the above heat dissipation self-closed structure for a nuclear power plant is assembled at the air outlet of the fan 5; when the fan 5 is working normally, the driving member 4 outputs power in the first direction and drives each blade 2 to rotate through the transmission component 3, so that each blade 2 remains in the open state, and the hot air passes through the ventilation gap and is discharged from the equipment, as Figure 6 shown.

[0051] When the fan 5 stops operating, the driving member 4 outputs power in the second direction and drives each blade 2 to rotate through the transmission assembly 3. Each blade 2 can overlap with the adjacent blade 2, as Figure 7 shown. There is no gap between every two adjacent blades 2, and the two blades 2 on both sides can also overlap with the inner wall of the outer frame 1, so as to completely block the installation cavity and prevent air flow from passing through.

[0052] A heat dissipation self-sealing structure for a nuclear power plant provided by the present utility model is provided with an outer frame 1 at the air outlet of the fan 5, and a blade group composed of a plurality of blades 2 is arranged in the installation cavity of the outer frame 1. Since the fan 5 is electrically connected to the driving member 4, when the fan 5 is operating normally, the driving member 4 and the transmission assembly 3 drive the blade group to be in an open state. At this time, there is a ventilation gap between each blade 2 and the adjacent blade 2, and the hot air is extracted by the fan 5; when the fan 5 fails and stops operating, the driving member 4 returns to its original position, drives the blade 2 to rotate through the transmission assembly 3, and makes the blade group in a closed state. At this time, each blade 2 overlaps with the adjacent blade 2 to block the installation cavity and prevent the hot air from entering the interior of the equipment through the installation cavity, thereby avoiding the hot air from flowing back and ensuring the normal heat dissipation and operation of the equipment.

[0053] In order to improve the stability of the rotation of the blade 2, preferably, two sets of the above-mentioned transmission assembly 3 and the driving member 4 are correspondingly provided, which are respectively located on both sides of the outer frame 1, and the two sets of transmission assemblies 3 are respectively connected to both ends of the blade 2.

[0054] In some embodiments, the above-mentioned transmission assembly 3 can adopt the structure as Figure 2 and Figure 4 shown. Refer to Figure 2 and Figure 4 . The transmission assembly 3 includes a rotating shaft group and a connecting rod structure 32. The rotating shaft group is rotatably arranged on the side wall of the outer frame 1; the rotating shaft group includes a plurality of rotating shafts 31; the end of each blade 2 is fixedly connected to a corresponding rotating shaft 31; the connecting rod structure 32 is located outside the outer frame 1, the input end is connected to the power end of the driving member 4, and the output end is connected to each rotating shaft 31; wherein, the driving member 4 is used to drive the input end of the connecting rod structure 32 to move linearly and the output end to rotate, so as to make each rotating shaft 31 rotate.

[0055] The rotating shaft 31 is rotatably arranged on the side wall of the outer frame 1, and the end of the blade 2 is sleeved on the rotating shaft 31. The blade 2 realizes rotation by means of the rotating shaft 31, so as to simplify the assembly method between the blade 2 and the outer frame 1 and the structure of the outer frame 1.

[0056] The connecting rod structure 32 is used to drive each rotating shaft 31 to rotate. The connecting rod structure 32 is located outside the outer frame 1, does not additionally occupy the space of the installation cavity, and has little influence on it when the air flow flows, so as to ensure the stable shape of the connecting rod structure 32 when the driving member 4 does not output power.

[0057] In addition, compared with chain drive, gear drive or belt drive, the connecting rod structure 32 has a simple structure, is suitable for small-stroke transmission, and does not need to be installed with the help of the outer frame 1 , but only needs to be connected to each rotating shaft 31 .

[0058] In some embodiments, the connecting rod structure 32 may be configured as follows: Figure 2 and Figure 4 The structure shown, see Figure 2 and Figure 4 The connecting rod structure 32 includes a straight rod 321 and a plurality of swing rods 322. One end of the straight rod 321 is connected to the power end of the driving member 4, and is driven by the driving member 4 to perform linear motion; the plurality of swing rods 322 correspond to the plurality of rotating shafts 31 one by one; one end of each swing rod 322 is connected to the straight rod 321, and the other end is connected to the corresponding rotating shaft 31.

[0059] The straight rod 321 is the input end of the connecting rod structure 32, and each swing rod 322 is the output end of the connecting rod structure 32. The driving member 4 outputs power to drive the straight rod 321 to make a linear motion, and the straight rod 321 drives each swing rod 322 to swing, so that each rotating shaft 31 rotates at a small angle, thereby driving each blade 2 to rotate.

[0060] The connecting rod structure 32 includes a straight rod 321 and multiple rocker rods 322, which are connected to the rotating shaft 31 by the rocker rod 322. It does not need to be installed with the help of the outer frame 1, and the rotating shaft 31 can also be rotated. Moreover, the connection method between the straight rod 321 and the multiple rocker rods 322 is simple, and the moving stroke is stable, which makes the structure of the entire transmission component 3 simple and optimizes the assembly method.

[0061] Preferably, see Figure 4 On the basis of the above-mentioned implementation manner, the swing rod 322 is a bent rod structure, and the two ends of the swing rod 322 are staggered.

[0062] The swing rod 322 is similar to an L-shaped rod, one end of which is connected to the rotating shaft 31 and the other end is connected to the straight rod 321. The two ends of the swing rod 322 are staggered to reduce the height of the swing rod 322 and the space occupied by the connecting rod structure 32 accordingly, and the bending rod structure can make the transmission of the swing rod 322 more stable.

[0063] In some embodiments, the blade assembly may be configured as follows: Figure 7 The structure shown, see Figure 7 In the closed state, each blade 2 overlaps with the adjacent blade 2. The overlapping overlap allows an overlapping portion between the two blades 2, ensuring that there is no gap between the two blades 2 in the closed state, and airflow cannot pass through.

[0064] See also Figure 2 and Figure 3, on the basis of the above - mentioned embodiments, the blade 2 includes a cylindrical part 21 and a lapping part 22. The two ends of the cylindrical part 21 are respectively rotatably connected to the outer frame body 1; the lapping part 22 is connected to the cylindrical part 21; the lapping part 22 has an arc - shaped lapping surface 221 adapted to the outer peripheral surface of the cylindrical part 21; in the closed state, the arc - shaped lapping surface 221 overlaps and laps with the outer peripheral surface of the cylindrical part 21.

[0065] The cylindrical part 21 is used for rotatably connecting with the two side walls of the outer frame body 1. The lapping part 22 is designed as an arc - shaped structure and is used to be adapted to the outer surface of the cylindrical part 21. In the closed state, the arc - shaped lapping surface 221 overlaps and laps with the outer peripheral surface of the cylindrical part 21. On the one hand, it can increase the overlapping and lapping area to ensure the tightness of the sealing. On the other hand, when the blade group switches from the open state to the closed state, it can ensure the smooth lapping between the two blades 2 and avoid hard collisions.

[0066] Please refer to Figure 2 and Figure 3 , on the basis of the above - mentioned embodiments, the blade 2 further includes an intermediate straight plate part 23. The intermediate straight plate part 23 is connected between the cylindrical part 21 and the lapping part 22.

[0067] The intermediate straight plate part 23 plays a role in increasing the width of the blade 2. In this way, the number of blades 2 in the blade group can be correspondingly reduced, and the distance between two adjacent blades 2 can be increased. On the one hand, it can avoid interference between the two cylindrical parts 21 and the lapping parts 22 in the closed state. On the other hand, in the open state, it can also increase the width of the ventilation gap.

[0068] In addition, adding the intermediate straight plate part 23 also makes the blade 2 easy to be manufactured and formed, and simplifies the manufacturing die.

[0069] In some embodiments, the above - mentioned cylindrical part 21 can adopt the structure as shown in Figure 3 See Figure 3 , a notch 211 is provided on the cylindrical part 21, and the notch 211 penetrates along the rotation axis direction of the cylindrical part 21.

[0070] Setting the notch 211 on the cylindrical part 21 enables the cylindrical part 21 to undergo slight deformation, so as to facilitate the assembly with the rotating shaft 31. Moreover, it can also simplify the structure of the blade 2 and make it easy to be formed.

[0071] Preferably, the lapping part 22 is an arc - shaped plate - like structure. Therefore, the whole blade 2 is a thin - plate - like structure, and the blade 2 is made of aluminum alloy material, making the blade 2 light in weight, and the blade 2 can also be pushed to rotate by the airflow.

[0072] In some embodiments, the above - mentioned outer frame body 1 can adopt the structure as shown in Figure 5 See Figure 5, the outer frame 1 is fixedly arranged at the air inlet of the fan 5.

[0073] The outer frame 1 is fixedly arranged at the air inlet of the fan 5. That is to say, the outer frame 1 is arranged inside the equipment housing 6 and away from the top wall of the housing 6. Although there is a distance between the air outlet of the fan 5 and the top wall of the housing 6, this distance may cause interference for the installation of the outer frame 1 and is not convenient for assembly operations. Therefore, in this embodiment, the outer frame 1 is installed at the air inlet of the fan 5. Moreover, the wind speed is high and the air volume is large at the air inlet, which can ensure the stable open state of the blades 2 under the airflow.

[0074] Please refer to Figures 5 to 7 , based on the same inventive concept, the embodiment of the present application also provides a fan module, which includes a housing 6 and at least two fans 5. At least two fans 5 are arranged at intervals inside the housing 6; wherein, a heat dissipation self-sealing structure for a nuclear power plant as described above is arranged at the air inlet of each fan 5.

[0075] In the fan module provided by the present utility model, an outer frame 1 is arranged at the air inlet of the fan 5, and a blade group composed of a plurality of blades 2 is arranged in the installation cavity of the outer frame 1. Since the fan 5 is electrically connected to the driving member 4, when the fan 5 is working normally, the driving member 4 and the transmission assembly 3 drive the blade group to be in an open state. At this time, there is a ventilation gap between each blade 2 and the adjacent blade 2, and the hot air is extracted by the fan 5; when the fan 5 fails and stops running, the driving member 4 returns to its original position, drives the blade 2 to rotate back through the transmission assembly 3, and makes the blade group in a closed state. At this time, each blade 2 overlaps with the adjacent blade 2 to block the installation cavity and prevent the hot air from entering the interior of the equipment through the installation cavity, thereby avoiding the backflow of hot air and ensuring the normal heat dissipation and operation of the equipment.

[0076] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat dissipation self - enclosed structure for a nuclear power plant, characterized in that, Comprising: An outer frame body (1) for being installed at the air outlet of a blower (5); the outer frame body (1) has an installation cavity penetrating along the air flow direction; A blade group arranged in the installation cavity; the blade group includes a plurality of blades (2) that are parallel and spaced apart; both ends of each blade (2) are respectively rotationally connected to the outer frame body (1); A transmission assembly (3) respectively connected to each blade (2) for driving each blade (2) to rotate; And A driving member (4) with a power end connected to the transmission assembly (3); the driving member (4) is also electrically connected to the blower (5); Wherein, when the blower (5) is operating normally, the driving member (4) and the transmission assembly (3) drive the blade group to be in an open state, and there is a ventilation gap between each blade (2) and the adjacent blade (2); when the blower (5) stops, the driving member (4) and the transmission assembly (3) drive the blade group to be in a closed state, and each blade (2) overlaps with the adjacent blade (2) to block the installation cavity.

2. The heat dissipation self-enclosed structure for a nuclear power plant according to claim 1, characterized in that, The transmission assembly (3) includes: A rotating shaft group rotatably arranged on the side wall of the outer frame body (1); the rotating shaft group includes a plurality of rotating shafts (31); the end of each blade (2) is correspondingly fixedly connected to a rotating shaft (31); and A connecting rod structure (32) located outside the outer frame body (1), with an input end connected to the power end of the driving member (4) and an output end connected to each rotating shaft (31); Wherein, the driving member (4) is used to drive the input end of the connecting rod structure (32) to perform a linear motion and the output end to perform a rotational motion, so as to rotate each rotating shaft (31).

3. The heat dissipation self - enclosed structure for a nuclear power plant according to claim 2, characterized in that, The connecting rod structure (32) includes: A straight rod (321) with one end connected to the power end of the driving member (4) and driven by the driving member (4) to perform a linear motion; and A plurality of swing rods (322) corresponding one-to-one to the plurality of rotating shafts (31); one end of each swing rod (322) is connected to the straight rod (321), and the other end is connected to the corresponding rotating shaft (31).

4. A heat dissipation self-enclosed structure for a nuclear power plant according to claim 3, characterized in that, The swing rod (322) is of a bent rod structure, and the two ends of the swing rod (322) are arranged staggeredly.

5. The heat dissipation self-closed structure for a nuclear power plant according to claim 1, wherein The blade (2) includes: A cylindrical portion (21) with both ends respectively rotationally connected to the outer frame body (1); and An overlapping portion (22) connected to the cylindrical portion (21); the overlapping portion (22) has an arc-shaped overlapping surface (221) adapted to the outer peripheral surface of the cylindrical portion (21); in the closed state, the arc-shaped overlapping surface (221) overlaps and joins with the outer peripheral surface of the cylindrical portion (21).

6. The heat dissipation self - enclosed structure for a nuclear power plant according to claim 5, characterized in that, The blade (2) further includes: A middle straight plate portion (23) connected between the cylindrical portion (21) and the overlapping portion (22).

7. The heat dissipation self-enclosed structure for a nuclear power plant according to claim 5, characterized in that, A notch (211) is provided on the cylindrical portion (21), and the notch (211) penetrates along the rotational axis direction of the cylindrical portion (21).

8. A heat dissipation self - closed structure for a nuclear power plant according to claim 5, characterized in that, The overlapping portion (22) is of an arc-shaped plate structure.

9. The heat dissipation self-sealing structure for a nuclear power plant according to claim 1, characterized in that, The outer frame body (1) is fixedly arranged at the air inlet of the blower (5).

10. A fan module, characterized in that, Comprising: A housing (6); At least two fans (5), spaced inside the housing (6); wherein, at the air outlet of each fan (5) is provided with a heat dissipation self-sealing structure for a nuclear power plant according to any one of claims 1-9.

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