Connecting mechanism

Abstract

The invention provides a connecting mechanism which comprises a screw rod and a locking mechanism, the screw rod comprises a first connecting end and a second connecting end in the axial direction, the first connecting end is in threaded connection with a first plate body, and the second connecting end is arranged in a second plate body in a penetrating mode and at least extends into a containing groove formed in the second plate body and deviates from the first plate body; a first matching piece is arranged at the second connecting end of the screw rod; the locking mechanism is placed in the containing groove and fixedly connected with the second plate body, the locking mechanism is provided with an inner cavity, and the second connecting end of the screw penetrates through the locking mechanism and extends into the inner cavity; wherein the bottom of the locking mechanism abuts against the groove bottom of the containing groove, the locking mechanism is provided with a second matching piece in the inner cavity, and the first matching piece and the second matching piece are connected in a clamped mode in the radial direction of the screw rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plant equipment fastening, in particular to a connecting mechanism. BACKGROUND

[0002] In the field of nuclear power plant equipment fastening, the screw connection inside the reactor needs to withstand severe conditions such as vibration, thermal shock and fast neutron irradiation for a long time. The traditional anti-loosening method relies on the welding of nuts, anti-loosening pins and connected parts to ensure reliability.

[0003] However, as early nuclear power plants enter the late life or life extension phase, the replacement and maintenance of internal components of the reactor are frequent, and long-term irradiation will cause the toughness of the component material to decrease. The traditional anti-loosening measures are inconvenient to install in the narrow space of the reactor internals sink hole, and the welding performance cannot meet the requirements due to high intensity irradiation, so a non-welding, convenient to install and reliable anti-loosening screw anti-loosening solution is urgently needed.

[0004] Based on this, the present application provides a connecting mechanism to solve one or more of the above technical problems. SUMMARY

[0005] The technical problem solved by the present application is to overcome the defects of the traditional anti-loosening measures in the prior art, which are inconvenient to install in the narrow space of the reactor internals sink hole and cannot meet the requirements due to high intensity irradiation, and to provide a connecting mechanism.

[0006] The present application solves the above technical problems by the following technical scheme:

[0007] The present application provides a connecting mechanism for connecting a first plate body and a second plate body of a reactor internal component, comprising:

[0008] a screw rod comprising a first connecting end and a second connecting end in the axial direction, the first connecting end being threadedly connected with the first plate body, the second connecting end being provided through the second plate body and extending at least into a receiving groove opened in the second plate body away from the first plate body, the second connecting end of the screw rod being provided with a first matching part;

[0009] a locking mechanism placed in the receiving groove and fixedly connected with the second plate body, the locking mechanism having an inner cavity, the second connecting end of the screw rod passing through the locking mechanism and extending into the inner cavity; wherein,

[0010] the bottom of the locking mechanism abuts against the groove bottom of the receiving groove, the locking mechanism being provided with a second matching part in the inner cavity, and the first matching part and the second matching part being mutually clamped in the radial direction of the screw rod.

[0011] According to one of the embodiments of the present application, the intermediate section of the screw is between the first connecting end and the second connecting end of the screw, the first plate body is provided with a threaded hole, and the second plate body is provided with a mounting hole coaxial with and communicating with the accommodating groove;

[0012] The first connecting end of the screw is threadedly connected with the threaded hole, and the second connecting end of the screw extends into the accommodating groove through the mounting hole.

[0013] The intermediate section of the screw and the hole wall of the mounting hole form a buffer cavity.

[0014] According to one of the embodiments of the present application, the inner diameter of the accommodating groove is greater than the inner diameter of the threaded hole.

[0015] According to one of the embodiments of the present application, the first matching part is a matching groove, and the second matching part is a matching block.

[0016] According to one of the embodiments of the present application, the locking mechanism is a locking ring, the outer wall of the locking ring abuts against the circumferential wall of the accommodating groove, the locking ring comprises a bottom plate and a circumferential plate, the bottom plate and the circumferential plate form the inner cavity, the bottom plate is provided with a matching hole, and the screw is arranged in the matching hole.

[0017] The bottom plate is provided with at least one matching block around the circumferential direction of the matching hole, and the second connecting end of the screw is provided with at least one matching groove matched with the matching block on the side of the bottom plate.

[0018] According to one of the embodiments of the present application, the number of the matching block and the matching groove is consistent, and the number of the matching block is at least two.

[0019] At least two matching blocks are uniformly distributed along the circumferential direction of the matching hole.

[0020] According to one of the embodiments of the present application, the first matching part is a clamping block, and the second matching part is a clamping groove.

[0021] According to one of the embodiments of the present application, the locking mechanism is a locking ring, the outer wall of the locking ring abuts against the circumferential wall of the accommodating groove, the locking ring comprises a bottom plate and a circumferential plate, the bottom plate and the circumferential plate form the inner cavity, the bottom plate is provided with a matching hole, and the screw is arranged in the matching hole.

[0022] The bottom plate is further provided with at least one clamping groove communicating with the matching hole, and the second connecting end of the screw is provided with a clamping block matched with the clamping groove on the side of the bottom plate.

[0023] According to one embodiment of the present application, the first fitting member is a positioning pin, and the second fitting member is a positioning hole.

[0024] The second connecting end of the screw rod is provided with at least one pin hole, and the positioning pin is configured to be sequentially arranged in the positioning hole and the pin hole to connect the locking mechanism and the screw rod.

[0025] According to one embodiment of the present application, the number of the positioning pin and the positioning hole is consistent, and the number of the positioning hole is at least two.

[0026] The at least two positioning holes are uniformly distributed along the circumference of the locking mechanism.

[0027] According to one embodiment of the present application, the locking mechanism is integrally arranged with the screw rod.

[0028] According to one embodiment of the present application, the locking mechanism is at least partially protruded outside the accommodating groove.

[0029] The locking mechanism is configured to be knocked at the top end of the locking mechanism by a target tool to form a folded edge in a state that the installation of the screw rod is completed, and the folded edge is clamped on the outer edge of the second plate body in the accommodating groove.

[0030] According to one embodiment of the present application, the groove depth of the accommodating groove is consistent with the rotatable length of the first connecting end of the screw rod.

[0031] The locking mechanism is threadedly connected with the accommodating groove.

[0032] According to one embodiment of the present application, the second plate body is provided with a clamping groove on the groove wall of the accommodating groove.

[0033] The inner wall of the locking mechanism is clamped in the clamping groove through plastic deformation.

[0034] According to one embodiment of the present application, the second connecting end of the screw rod is further provided with a screw head, which is protruded from the second connecting end or is shrunk inside the second connecting end.

[0035] The positive progress effect of the present application is that:

[0036] Compared with the traditional connecting mechanism, the connecting mechanism of the present application eliminates the nut, which can not only reduce the number of parts at the connecting part of the in-core component, reduce the potential failure points of the parts in the high-temperature and strong radiation environment of the nuclear power, but also can adapt to the narrow installation space of the in-core component counterbore, avoid the assembly difficulty caused by the insufficient space required for nut installation, and further improve the safety of the reactor operation. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0038] Figure 1 This is a schematic diagram of the locking mechanism according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the screw structure according to one embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the connection mechanism according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the locking mechanism according to another embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the screw structure according to another embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the connection mechanism according to another embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the locking mechanism according to another embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the screw structure according to another embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the connection mechanism according to another embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the screw structure according to another embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of the connection mechanism according to another embodiment of the present invention.

[0049] 1. Screw; 11. First connecting end; 12. Second connecting end; 13. First mating part; 14. Intermediate section; 15. Pin hole; 16. Screw head;

[0050] 2. First plate; 21. Threaded hole;

[0051] 3. Second plate; 31. Receiving groove; 32. Mounting hole; 33. Buffer cavity; 34. Snap-fit ​​groove;

[0052] 4. Locking mechanism; 41. Inner cavity; 42. Second mating part; 43. Base plate; 431. Mating hole; 44. Peripheral side plate. Detailed Implementation

[0053] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] Reference Figures 1 to 3 The connecting mechanism of the present invention is used to connect the first plate 2 and the second plate 3 of the stack internal components. The connecting mechanism includes a screw 1 and a locking mechanism 4. The two ends of the screw 1 along its axial direction are a first connecting end 11 and a second connecting end 12, respectively. The first connecting end 11 is threadedly connected to the first plate 2. The second connecting end 12 passes through the second plate 3 and extends at least into the receiving groove 31 opened in the second plate 3 away from the first plate 2. The second connecting end 12 of the screw 1 is provided with a first mating member 13.

[0056] The locking mechanism 4 is located in the receiving groove 31 and is fixedly connected to the second plate 3. The fixing method is non-welding, which can be referred to later.

[0057] The locking mechanism 4 has an inner cavity 41. The second connecting end 12 of the screw 1 passes through the locking mechanism 4 and extends into the inner cavity 41. As the screw 1 is screwed in, the bottom of the locking mechanism 4 is pressed against the bottom of the receiving groove 31. At the same time, the first mating part 13 and the second mating part 42 are engaged with each other radially along the screw 1.

[0058] Compared to traditional connection mechanisms, this application eliminates the nut, using only the screw 1 and locking mechanism 4 to connect the first plate 2 and the second plate 3 and prevent loosening. This avoids the welding failure problem caused by the reduction in material toughness after long-term exposure to fast neutron radiation in reactor components, and solves the problem of inconvenient installation of traditional nuts in confined countersunk hole spaces. Furthermore, the non-welded structure facilitates maintenance and replacement in high-radioactive environments, thus reducing operation and maintenance costs and safety risks.

[0059] Moreover, even if the screw 1 of this application breaks, the broken part is restricted by the locking mechanism 4 and will not fall out of the first plate 2 and the second plate 3, which fully meets the safety protection requirements of nuclear power plants.

[0060] Please continue to refer toFigure 1 and Figure 3 The first mating part 13 is a mating groove, the second mating part 42 is a mating block, and the locking mechanism 4 is a locking ring. The locking ring is cylindrical, and the outer wall of the locking ring is in close contact with the inner peripheral wall of the receiving groove 31, so that the second plate 3 can support the locking ring.

[0061] Specifically, the locking ring includes a base plate 43 and a peripheral side plate 44. The base plate 43 and the peripheral side plate 44 are integrally formed and enclose an inner cavity 41. A mating hole 431 is provided on the base plate 43, and the second connecting end 12 of the screw 1 extends into the inner cavity 41 through the mating hole 431.

[0062] Optionally, the base plate 43 is provided with at least one mating block circumferentially around the mating hole 431, and correspondingly, the second connecting end 12 of the screw 1 is provided with at least one mating groove adapted to the at least one mating block. When connecting the first plate 2 and the second plate 3, the first connecting end 11 of the screw 1 is continuously screwed into the first plate 2 until the second connecting end 12 of the screw 1 presses against the base plate 43 of the locking ring, at which point the mating block is engaged in the mating groove.

[0063] The engagement of the mating block and the mating groove can restrict the circumferential rotation of the screw 1 and the locking mechanism 4. Then, the locking mechanism 4 is pressed into the snap-fit ​​groove 34 (see below) at the receiving groove 31 of the second plate 3 by a special tool. In this way, the locking mechanism 4 can prevent the screw 1 from loosening.

[0064] like Figure 1 As shown, there are two mating blocks, and the two mating blocks are evenly distributed around the circumference of the mating hole 431. However, in actual applications, the number of mating blocks and mating grooves can be one, three, four, etc., and multiple mating blocks can be evenly distributed around the circumference of the mating hole 431. This is not limited here.

[0065] and, Figure 1 The mating block is square in shape. In some alternative embodiments, the mating block may also be circular, triangular or other shapes, which are not limited here.

[0066] Please continue to refer to Figure 2 and Figure 3 The screw 1 has a middle section 14 between its first connecting end 11 and second connecting end 12. A threaded hole 21 is provided on the first plate 2, and a mounting hole 32 is provided on the second plate 3. The mounting hole 32 is coaxial with and communicates with the receiving groove 31. The first connecting end 11 of the screw 1 is threaded into the threaded hole 21, and the second connecting end 12 of the screw 1 passes through the mounting hole 32 and extends into the receiving groove 31. A buffer cavity 33 is formed between the middle section 14 of the screw 1 and the wall of the mounting hole 32.

[0067] That is, the diameter of the middle section 14 is smaller than the diameter of the first connecting end 11 and the second connecting end 12 of the screw 1. Because the internal components are in an environment with frequent temperature fluctuations, there is a difference in thermal expansion between the first plate 2 and the second plate 3. If there is no gap between the middle part of the screw 1 and the second plate 3, when the temperature rises, the different expansion amounts of the first plate 2 and the second plate 3 will generate mutual compressive stress, which will lead to local deformation between the screw 1 and the second plate 3, and even cause thread engagement failure, resulting in connection failure between the first plate 2 and the second plate 3. When the temperature drops, a gap will be generated due to the difference in shrinkage, which will destroy the preload of the screw 1.

[0068] Furthermore, the first plate 2 and the second plate 3 may have slight coaxiality deviations or hole diameter errors due to processing precision and deformation after irradiation. If there is no gap between the middle part of the screw 1 and the second plate 3, the slight coaxiality deviation will cause the screw 1 to get stuck during installation and cannot be screwed in smoothly. Forced assembly may also damage the thread profile or cause the screw 1 to generate initial bending stress.

[0069] In other words, the reserved buffer cavity 33 can accommodate assembly errors, ensuring that the screw 1 can smoothly pass through the second plate 3 and avoid affecting the anti-loosening effect due to assembly problems. Moreover, the buffer cavity 33 can also temporarily store broken parts of the screw 1, thereby improving the safety of nuclear power plant operation.

[0070] Furthermore, the screw 1 needs to withstand vibration loads under nuclear power operating conditions. If there is no gap between the middle part of the screw 1 and the second plate 3, the second plate 3 will exert a constrained compression on the screw 1 during vibration, causing the screw 1 to bear additional bending stress. Long-term bending stress will lead to fatigue damage of the screw 1, and even cracks will be generated in the middle section 14 of the screw 1. After the screw 1 in the nuclear power plant is irradiated, the material toughness decreases and the crack propagation speed is faster, which may cause the screw 1 to fracture and fail.

[0071] In this way, the buffer cavity 33 can release the bending constraint of the second plate 3 during vibration, so that the screw 1 has a small amount of room to move during vibration, reducing the accumulation of bending stress, reducing the risk of fatigue fracture, and extending the service life of the screw 1.

[0072] Furthermore, if there is no gap between the middle of the screw 1 and the second plate 3, after long-term use, especially under the influence of radiation and high-temperature oxidation, the screw 1 and the second plate 3 may stick together. When disassembling the bolts during maintenance, it is necessary to overcome huge frictional forces, which can easily damage the first plate 2 and the second plate 3.

[0073] In other words, the buffer cavity 33 can reduce the contact area between the screw 1 and the second plate 3, reduce the risk of adhesion, and provide space for auxiliary disassembly operations during maintenance, thus meeting the needs of rapid and safe maintenance in the high-radioactivity environment of nuclear power plants.

[0074] In one embodiment, the inner diameter of the receiving groove 31 is larger than the inner diameter of the threaded hole 21.

[0075] The design of the inner diameter of the receiving groove 31 being larger than that of the threaded hole 21 is suitable for scenarios where the installation space of the countersunk hole of the stack components is narrow. On the one hand, it provides sufficient assembly space for the locking mechanism 4, avoiding installation difficulties caused by limited space. On the other hand, the larger inner diameter of the receiving groove 31 can accommodate the fixing structure between the locking mechanism 4 and the side wall of the receiving groove 31, ensuring the fixing reliability of the locking mechanism 4 and the second plate 3, while not affecting the precise fit between the first connecting end 11 of the screw 1 and the threaded hole 21.

[0076] In one embodiment, the second plate 3 has a snap-fit ​​groove 34 on the groove wall of the receiving groove 31, and the inner wall of the locking mechanism 4 is snapped into the snap-fit ​​groove 34 by plastic deformation.

[0077] Specifically, the snap-fit ​​groove 34 can be an arc-shaped groove, a square groove, or a dovetail groove, and the specific shape is not limited here.

[0078] During actual installation, the cylindrical locking mechanism 4 is first placed in the receiving groove 31, and then a special tool or hammering is used to plastically deform the peripheral plate 44 of the locking mechanism 4 and squeeze it into the snap-fit ​​groove 34 of the second plate 3, so that the locking mechanism 4 and the second plate 3 are tightly fixedly connected.

[0079] It can be seen that the number of snap-fit ​​grooves 34 can be two, three or more, and there is no limitation here. Multiple snap-fit ​​grooves 34 can be evenly distributed around the circumference of the receiving groove 31, which can improve the connection and tightness between the locking mechanism 4 and the second plate 3.

[0080] The snap-fit ​​groove 34 not only allows for a tight connection between the second plate 3 and the locking mechanism 4 without welding, but also limits the axial and radial movement of the locking mechanism 4.

[0081] In some other embodiments, the locking mechanism 4 protrudes at least partially from the outside of the receiving groove 31; the locking mechanism 4 is configured to form a folded edge by striking the top of the locking mechanism 4 with a target tool when the screw 1 is installed, and the folded edge is engaged in the groove of the second plate 3 at the outer edge of the receiving groove 31.

[0082] That is, a recessed groove can be provided on the top surface of the second plate 3, and the top of the locking mechanism 4 can be folded by tapping, so that the folded edge is embedded in the groove.

[0083] It should be noted that the shape of the slot can be rectangular, square, or dovetail-shaped, and there is no limitation here.

[0084] In some other embodiments, the depth of the receiving groove 31 is consistent with the screw-in length of the first connecting end 11 of the screw 1; the locking mechanism 4 is threadedly connected to the receiving groove 31.

[0085] That is, an internal thread is provided on the inner wall of the receiving groove 31 so that the locking mechanism 4 is also threadedly connected to the second plate 3. The connection stability between the screw 1 and the first plate 2 can be strengthened by the further limiting of the locking mechanism 4.

[0086] Please continue to refer to Figure 2 and Figure 3 The screw 1 is also provided with a protruding screw head 16 at the second connecting end 12. The screw head 16 can be square or hexagonal, which makes it easy for a special tool to screw the screw 1 in.

[0087] In one implementation, please refer to Figures 4 to 6 The first mating part 13 is a snap-fit ​​block, and the second mating part 42 is a snap-fit ​​groove.

[0088] The base plate 43 of the locking ring is provided with two snap-fit ​​grooves along the circumference of the mating hole 431. The second connecting end 12 of the screw 1 is provided with two snap-fit ​​blocks that snap into the snap-fit ​​grooves. The engagement of the snap-fit ​​grooves and the snap-fit ​​blocks can prevent the screw 1 from rotating, thereby improving the connection and fastening of the bolt to the first plate 2 and the second plate 3.

[0089] Optionally, in this embodiment, there are two snap-fit ​​slots and two snap-fit ​​blocks, but the specific number of snap-fit ​​slots and snap-fit ​​blocks is not limited. For example, the number of snap-fit ​​slots and snap-fit ​​blocks can also be one, three, or more, and is not limited here.

[0090] Furthermore, in this embodiment, the locking mechanism 4 can be fastened to the second plate 3 by means of a folded edge or a snap-fit ​​groove 34 embedded in the middle of the receiving groove 31 of the second plate 3, which is not limited here.

[0091] Please refer to Figures 7 to 9 In one embodiment, the first mating part 13 is a positioning pin, and the second mating part 42 is a positioning hole.

[0092] That is, the second connecting end 12 of the screw 1 is provided with at least one pin hole 15, and the locking mechanism 4 is also provided with a positioning hole corresponding to the pin hole 15 along its circumference. The screw 1 and the locking mechanism 4 can be fastened by the positioning pin passing through the positioning hole and the pin hole 15 in sequence.

[0093] During actual installation, the positioning pin can be passed through the positioning hole and pin hole 15 to connect the screw 1 with the locking mechanism 4. At this time, the screw 1 and the locking mechanism 4 are a whole. When the screw 1 is connected to the first plate 2, it will drive the locking mechanism 4 to cooperate along the axial direction of the receiving groove 31. Finally, when the screw 1 and the first plate 2 are tightly cooperated, the locking mechanism 4 also reaches the bottom of the receiving groove 31.

[0094] It is understood that in this embodiment, the number of positioning holes, pin holes 15 and positioning pins are all two. However, in other embodiments, the number of positioning holes, pin holes 15 and positioning pins can be adjusted as needed, for example, one, three or more, which is not limited here.

[0095] That is, in this embodiment, the first mating part 13 of the screw 1 is detachably connected to the screw 1, which makes it easy for the locking mechanism 4 to fit against the inner wall of the receiving groove 31, and avoids the receiving groove 31 being too large and affecting the overall structural strength of the second plate 3.

[0096] Please refer to Figure 10 and Figure 11 In this embodiment, the locking mechanism 4 and the screw 1 are integrally formed, which further reduces the number of parts required for the connecting mechanism. Using a single molded part of the same material prevents electrochemical corrosion between different materials, adapts to the corrosive environment within the reactor, and eliminates the assembly steps for the locking mechanism 4 and the screw 1, further simplifying the installation process and reducing operational risks in a high-radioactivity environment.

[0097] In actual installation, the screw 1 can be installed together with the locking mechanism 4 to the first plate 2 and the second plate 3. After the screw 1 is connected to the first plate 2 and the second plate 3, a special tool or tapping can be used to make the inner wall of the locking mechanism 4 embedded in the snap-fit ​​groove 34 of the receiving groove 31 of the second plate 3, thereby completing the fastening connection between the locking mechanism 4 and the second plate 3.

[0098] In this embodiment, the screw head 16 is retracted inside the second connecting end 12. This allows for the adaptation to different tools, and the screw head 16 located inside the stack can avoid interference with other components within the stack, making it suitable for narrow installation spaces.

[0099] In summary, the connection mechanism proposed in this application does not require welding to fix the connected parts (first plate 2 and second plate 3), and is suitable for screws 1 inside the reactor of an operating nuclear power plant and working environments where welding is not possible or welding space is limited.

[0100] The locking mechanism 4 is plastically deformed using a special tool and pressed into the locking groove 34 of the second plate 3, effectively preventing the screw 1 from rotating and achieving the purpose of preventing the screw 1 from loosening. Because the locking mechanism 4 fits and limits the engagement with the locking groove 34 of the second plate 3, it avoids additional adverse effects on the operation of the reactor system equipment due to the failure of the screw 1 or the locking mechanism 4.

[0101] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0102] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0103] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A connecting mechanism for connecting a first plate and a second plate of a stack internal component, characterized in that, include: The screw includes a first connecting end and a second connecting end along the axial direction. The first connecting end is threadedly connected to the first plate body, and the second connecting end passes through the second plate body and extends at least into a receiving groove opened in the second plate body away from the first plate body. The second connecting end of the screw is provided with a first mating member. A locking mechanism is placed in the receiving groove and fixedly connected to the second plate. The locking mechanism has an inner cavity, and the second connecting end of the screw passes through the locking mechanism and extends into the inner cavity. The bottom of the locking mechanism abuts against the bottom of the receiving groove. The locking mechanism is provided with a second mating member in the inner cavity. The first mating member and the second mating member are engaged with each other along the radial direction of the screw.

2. The connecting mechanism according to claim 1, characterized in that, The first connecting end and the second connecting end of the screw form the middle section of the screw. The first plate has a threaded hole, and the second plate has a mounting hole. The mounting hole is coaxial with the receiving groove and is interconnected with it. The first connecting end of the screw is threaded into the threaded hole, and the second connecting end of the screw extends through the mounting hole into the receiving groove; A buffer cavity is formed between the middle section of the screw and the wall of the mounting hole.

3. The connecting mechanism according to claim 2, characterized in that, The inner diameter of the receiving groove is larger than the inner diameter of the threaded hole.

4. The connecting mechanism according to claim 1, characterized in that, The first mating component is a mating groove, and the second mating component is a mating block.

5. The connecting mechanism according to claim 4, characterized in that, The locking mechanism is a locking ring. The outer wall of the locking ring abuts against the peripheral side wall of the receiving groove. The locking ring includes a base plate and a peripheral side plate. The base plate and the peripheral side plate enclose the inner cavity. A mating hole is provided on the base plate, and the screw passes through the mating hole. The base plate is provided with at least one mating block around the mating hole in the circumferential direction, and the second connecting end of the screw is provided with at least one mating groove adapted to the mating block on the side facing the base plate.

6. The connecting mechanism according to claim 5, characterized in that, The number of mating blocks is the same as the number of mating grooves, and the number of mating blocks is at least two; At least two of the mating blocks are evenly distributed along the circumference of the mating hole.

7. The connecting mechanism according to claim 1, characterized in that, The first mating component is a snap-fit ​​block, and the second mating component is a snap-fit ​​groove.

8. The connecting mechanism according to claim 7, characterized in that, The locking mechanism is a locking ring. The outer wall of the locking ring abuts against the peripheral side wall of the receiving groove. The locking ring includes a base plate and a peripheral side plate. The base plate and the peripheral side plate enclose the inner cavity. A mating hole is provided on the base plate, and the screw passes through the mating hole. The base plate is also provided with at least one snap-fit ​​groove communicating with the mating hole, and the second connecting end of the screw is provided with a snap-fit ​​block that mates with the snap-fit ​​groove on the side facing the base plate.

9. The connecting mechanism according to claim 1, characterized in that, The first mating part is a locating pin, and the second mating part is a locating hole; The second connecting end of the screw has at least one pin hole, and the positioning pin is configured to pass through the positioning hole and the pin hole in sequence to connect the locking mechanism and the screw.

10. The connecting mechanism according to claim 9, characterized in that, The number of positioning pins and positioning holes is the same, and the number of positioning holes is at least two; At least two of the positioning holes are evenly distributed along the circumference of the locking mechanism.

11. The connecting mechanism according to claim 1, characterized in that, The locking mechanism is integrally formed with the screw.

12. The connecting mechanism according to claim 1, characterized in that, The locking mechanism protrudes at least partially from the outside of the receiving groove; The locking mechanism is configured such that, with the screw installed, the top of the locking mechanism is struck by a target tool to form a folded edge, and the folded edge is engaged with the outer edge of the second plate in the receiving groove.

13. The connecting mechanism according to claim 1, characterized in that, The depth of the receiving groove is consistent with the screw-in length of the first connecting end of the screw. The locking mechanism is threadedly connected to the receiving groove.

14. The connecting mechanism according to claim 1, characterized in that, The second plate has a snap-fit ​​groove on the wall of the receiving groove; The inner wall of the locking mechanism is engaged in the locking groove through plastic deformation.

15. The connecting mechanism according to claim 1, characterized in that, The second connecting end of the screw is also provided with a screw head, which protrudes from the second connecting end or is retracted inside the second connecting end.

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