Fastening anti-loose assembly and energy storage inverter

Abstract

The utility model discloses a fastening and anti-loosening assembly and an energy storage inverter, and the fastening and anti-loosening assembly comprises a nut which comprises a nut body part and a mounting part, and a gasket sleeves the mounting part; one of the mounting part and the gasket is provided with a convex part, the other one of the mounting part and the gasket is provided with an annular groove, the convex part is inserted into the annular groove, and the convex part has a rotational degree of freedom relative to the groove wall of the annular groove in the circumferential direction of the nut body part; wherein one of the groove wall of the annular groove and the protruding part is provided with a tooth part, the other one of the groove wall of the annular groove and the protruding part is provided with a groove part, the tooth part can be inserted into the groove part in the axial direction, and the tooth part can abut against the groove wall of the groove part in the circumferential direction. According to the embodiment of the invention, the fastening anti-loosening assembly is good in vibration resistance or impact resistance, is not liable to loosen, and can guarantee the reliability of electrical connection.

Description

Technical Field

[0001] This application relates to the field of electrical connection technology, and in particular to a fastening and anti-loosening assembly and an energy storage inverter. Background Technology

[0002] In the field of electrical connections, fastening assemblies and threaded fasteners such as bolts can be used between connected components to achieve the required electrical connection. These fastening assemblies typically include a main component and an auxiliary component. When the main component is tightened against the threaded fastener, the main component presses against the auxiliary component, and the auxiliary component applies a counterforce to the main component. This increases the friction between the main component and the threaded fastener, preventing the main component from loosening to some extent.

[0003] However, due to structural defects, the fastening components in the related technologies have poor resistance to vibration and impact, and are prone to loosening in high vibration or impact environments, affecting the reliability of electrical connections. Utility Model Content

[0004] This application provides a fastening and anti-loosening assembly and an energy storage inverter. The fastening and anti-loosening assembly has good resistance to vibration or impact, is not prone to loosening, and can ensure the reliability of electrical connections.

[0005] On one hand, embodiments of this application provide a fastening and anti-loosening assembly, comprising: a nut, including a nut body and a mounting portion, the mounting portion being connected to one end of the nut body in the axial direction, and the mounting portion being coaxially disposed with the nut body; a washer, sleeved on the mounting portion, the washer being rotatably engaged with the mounting portion, and gradually contracting inward in the axial direction from the mounting portion to the nut body, the end of the washer facing away from the nut body in the axial direction being used to abut against the connected component; wherein, the mounting portion and One of the washers has a protrusion, and the other of the mounting part and the washer has an annular groove. The annular groove extends circumferentially along the nut body. The protrusion is inserted into the annular groove and has rotational freedom relative to the groove wall of the annular groove in the circumferential direction of the nut body. The groove wall of the annular groove and the protrusion have teeth, and the groove wall of the annular groove and the protrusion have grooves. The teeth can be inserted into the grooves in the axial direction and abut against the groove wall in the circumferential direction.

[0006] In some embodiments, a protrusion is provided at one end of the washer facing the nut body in the axial direction, the protrusion protrudes inward from the inner sidewall of the washer, a tooth is provided on one side of the protrusion facing the nut body in the axial direction, and an annular groove is provided on the outer sidewall of the mounting portion, with the groove and the tooth correspondingly provided on the groove wall of the annular groove.

[0007] In some embodiments, the mounting portion includes: a ring body connected to one end of the nut body in the axial direction, the outer diameter of the ring body being smaller than the outer diameter of the nut body; an annular flange disposed at one end of the ring body away from the nut body in the axial direction; the annular flange, the ring body, and the nut body being coaxially arranged with each other; the annular flange protruding outward from the outer sidewall of the ring body; the ring body, the annular flange, and the nut body together forming an annular groove; wherein the groove is disposed on the end face of the nut body facing the annular flange in the axial direction.

[0008] In some embodiments, the outer diameter of the annular flange is smaller than the outer diameter of the nut body.

[0009] In some embodiments, the washer includes: a tapered body fitted onto a mounting portion, the tapered body being rotatably engaged with the mounting portion, a protrusion or an annular groove being disposed on the tapered body, the tapered body gradually contracting inward in the axial direction from the mounting portion toward the nut body portion; and an outer flange disposed at one end of the tapered body opposite to the nut body portion in the axial direction, the outer flange protruding outward from the outer side wall of the tapered body, the outer flange being used to abut against the connected component.

[0010] In some embodiments, the outer flange includes a first annular structure that extends in the circumferential direction; and / or, the edges of the outer flange that are axially opposite to the nut body are provided with a first rounded chamfer.

[0011] In some embodiments, the fastening and anti-loosening assembly includes at least two teeth spaced apart in the circumferential direction, and at least two grooves, each tooth being able to extend into one of the at least two grooves.

[0012] In some embodiments, at least two teeth are evenly distributed in the circumferential direction, and at least two grooves are evenly distributed in the circumferential direction.

[0013] In some embodiments, the edges of the teeth facing the groove are provided with a second rounded chamfer; and / or, the protrusion includes a second annular structure that extends in the circumferential direction.

[0014] In some embodiments, the nut body includes a hexagonal nut; and / or, the nut body and the mounting portion are an integral structure.

[0015] On the other hand, this application provides an energy storage inverter, including: a circuit board with a terminal connected to one side of the circuit board; a copper busbar disposed on the side of the terminal away from the circuit board; a stud passing through the terminal and the copper busbar, one end of the stud being connected to the terminal; and a fastening and anti-loosening assembly as described above, wherein the nut of the fastening and anti-loosening assembly is sleeved on the stud and threadedly engaged with the stud, the nut being located on the side of the copper busbar away from the terminal, and the nut body being located at the end of the mounting part away from the copper busbar.

[0016] This application provides a fastening and anti-loosening assembly that can cooperate with external threaded connectors such as bolts to achieve a connection and fixation between at least two connected components that require electrical connection. The fastening and anti-loosening assembly includes a nut, a washer, a protrusion, and teeth. In use, the fastening and anti-loosening assembly can be placed with the nut body located on the side of the mounting portion away from the connected component (e.g., a copper busbar). The nut is screwed to the end of the external threaded connector, so that the nut and the connected component apply an axial force to the washer. The washer is compressed and deformed, so that the washer applies a reaction force to the nut body, causing the nut body to tighten with the bolt. Furthermore, by inserting the teeth into the groove in the axial direction, the teeth and groove form a mechanical lock in the circumferential direction. Even in high vibration or high impact environments, since the teeth can always be inserted into the groove, the teeth and groove can always form a mechanical lock in the circumferential direction to prevent the nut from reversing relative to the washer, thus maintaining the anti-loosening function. This allows the fastening and anti-loosening assembly provided in this embodiment to reduce nut loosening and improve connection reliability in high vibration or high impact environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the fastening and anti-loosening assembly according to some embodiments of this application;

[0019] Figure 2 Show Figure 1 Cross-sectional view along the AA direction;

[0020] Figure 3 This is a schematic diagram of the structure of the gasket in the fastening and anti-loosening assembly of some embodiments of this application;

[0021] Figure 4 Show Figure 3 Cross-sectional view along the BB direction;

[0022] Figure 5 This is a schematic diagram of the structure of the nut of the fastening and anti-loosening assembly in some embodiments of this application;

[0023] Figure 6 Show Figure 5 Cross-sectional view along the CC direction;

[0024] Figure 7 This is a structural schematic diagram of the fastening and anti-loosening assembly from another perspective of some embodiments of this application;

[0025] Figure 8This is a schematic diagram of the nut of the fastening and anti-loosening assembly from another perspective of some embodiments of this application;

[0026] Figure 9 This is a schematic diagram of the gasket of a fastening and anti-loosening assembly from another perspective, representing one of the embodiments of this application.

[0027] Figure 10 This is a top view of the gasket of the fastening and anti-loosening assembly according to some embodiments of this application;

[0028] Figure 11 This is a schematic diagram of the circuit board, copper busbar, studs, and fastening and anti-loosening assembly of an energy storage inverter according to some embodiments of this application.

[0029] The above figures include the following reference numerals:

[0030] 10. Nut; 11. Nut body; 12. Mounting part; 121. Ring body; 122. Annular flange;

[0031] 20. Washer; 21. Conical cylinder body; 22. Outer flange; 221. First rounded chamfer;

[0032] 31. Protrusion; 32. Annular groove;

[0033] 41. Toothed part; 411. Second rounded chamfer;

[0034] 50. Circuit board; 51. Terminal;

[0035] 60. Copper busbar; 70. Stud; 80. Fastening and anti-loosening assembly;

[0036] X, axial direction; Y, circumferential direction; Z, radial direction;

[0037] α, the opening angle of the inner hole of the washer. Detailed Implementation

[0038] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0040] In the field of electrical connections, traditional threaded fasteners such as nuts and bolts are used to achieve electrical connections. However, these fasteners often loosen over long-term use due to vibration, temperature changes, or load variations, leading to connection failure.

[0041] In related technologies, to ensure stable and reliable electrical connections, fastening components can be used in conjunction with external threaded fasteners such as bolts to achieve electrical connections. The fastening components include a main component and an auxiliary component. When the main component is fastened to the external threaded fastener, the main component presses against the auxiliary component, and the auxiliary component applies a reverse force to the main component, thereby increasing the friction between the main component and the external threaded fastener.

[0042] However, the anti-loosening performance of the fastening assembly in the relevant technology depends on the friction between the main component and the auxiliary component. In high vibration or impact environments, the axial force between the main component and the auxiliary component decreases, which leads to a gradual weakening of the friction between the main component and the auxiliary component. This reduces the anti-loosening function between the main component and the auxiliary component of the fastening assembly, resulting in poor vibration and impact resistance of the fastening assembly. In high vibration or impact environments, it is prone to loosening, affecting the reliability of the electrical connection.

[0043] The fastening and anti-loosening assembly disclosed in this application can be used, but is not limited to, in electrical connection equipment such as distribution cabinets, motors, or energy storage inverters. The connection structure of the copper busbar in this electrical connection equipment can be composed of the fastening and anti-loosening assembly disclosed in this application. This helps improve the connection reliability of the copper busbar in high vibration or high impact environments and prevents loosening of the connection.

[0044] This application provides an electrical connection device that uses a fastening and anti-loosening assembly as a copper busbar connection structure. The electrical connection device can be, but is not limited to, high and low voltage switchgear, distribution cabinets, energy storage inverters, motors, communication base stations, industrial robots, etc.

[0045] To address the problems of the prior art, this application provides a fastening and anti-loosening assembly and an energy storage inverter. The fastening and anti-loosening assembly provided in this application will be described below.

[0046] like Figures 1 to 10 As shown, this application provides a fastening and anti-loosening assembly, which includes a nut 10, a washer 20, a protrusion 31, and a toothed portion 41. The nut 10 includes a nut body 11 and a mounting portion 12. The mounting portion 12 is connected to one end of the nut body 11 in the axial direction X. The mounting portion 12 is coaxially arranged with the nut body 11. The washer 20 is sleeved on the mounting portion 12, and the washer 20 is rotatably engaged with the mounting portion 12. In the axial direction X, from the mounting portion 12 to the nut body 11, the washer 20 gradually contracts inward. The end of the washer 20 facing away from the nut body 11 in the axial direction is used to engage with the... The connector abuts, wherein one of the mounting part 12 and the washer 20 is provided with a protrusion 31, and the other of the mounting part 12 and the washer 20 is provided with an annular groove 32. The annular groove 32 extends circumferentially along the mounting part 12. The protrusion 31 is inserted into the annular groove 32, and the protrusion 31 has a degree of rotational freedom relative to the groove wall of the annular groove 32 in the circumferential direction Y of the mounting part 12. One of the groove wall of the annular groove 32 and the protrusion 31 is provided with a tooth 41, and the other of the groove wall of the annular groove 32 and the protrusion 31 is provided with a groove. The tooth 41 can be inserted into the groove in the axial direction X, and the tooth 41 can abut against the groove wall in the circumferential direction Y.

[0047] Using the fastening and anti-loosening assembly provided in this embodiment, the fastening and anti-loosening assembly can cooperate with external threaded connectors such as bolts to achieve a connection and fixation between at least two connected parts that require electrical connection. In use, the fastening and anti-loosening assembly can be placed with the nut body 11 located on the side of the mounting part 12 away from the connected part (e.g., copper busbar). The nut 10 is screwed to the end of the external threaded connector, so that the nut 10 and the connected part apply an axial force to the washer 20. The washer 20 is deformed under pressure, so that the washer 20 applies a reaction force to the nut body 11, so that the nut body 11 is tightened with the bolt. Furthermore, by inserting the tooth 41 into the groove along the axial direction X, the tooth 41 and the groove form a mechanical lock in the circumferential direction Y. Even under high vibration or high impact environments, since the tooth 41 can always be inserted into the groove, the tooth 41 and the groove can always form a mechanical lock in the circumferential direction Y, so as to prevent the nut 10 from reversing relative to the washer 20, thus maintaining the anti-loosening function. This allows the fastening and anti-loosening assembly provided in this embodiment to reduce nut loosening and improve connection reliability under high vibration or high impact environments.

[0048] Optionally, in its natural state without axial force, the inner diameter of the end of the washer 20 away from the nut body 11 along the axial direction X is larger than the outer diameter of the mounting portion 12. In the direction along the axial direction X and away from the nut body 11 from the mounting portion 12, the washer 20 protrudes from the mounting portion 12. When the nut 10 is screwed to the end of the bolt, the washer 20 abuts against the nut body 11 and the connected member respectively, so that the nut 10 and the connected member apply axial force to the washer 20.

[0049] It should be noted that the coaxial arrangement of the mounting part 12 and the nut body part 11 means that the axis of the mounting part 12 is coaxial with the axis of the nut body part 11.

[0050] It should be noted that "inward" in "washer 20 gradually shrinks inward" refers to the direction Z in the radial direction pointing towards the axis of the mounting part 12.

[0051] Specifically, in the axial direction X, from the mounting part 12 towards the nut body part 11, the washer 20 gradually contracts inward. The washer 20 can adopt shapes such as conical or cup-shaped structures. The washer 20 can be uniformly contracted, as long as it presents an overall contracted state. The tooth 41 can abut against the groove wall of the groove in the circumferential direction Y. This can be done by both sides of the tooth 41 simultaneously abutting against the groove wall, or by only one side of the tooth 41 abutting against the groove wall. The tooth 41 and the groove can be respectively provided on two surfaces opposite each other in the axial direction X, and also on two surfaces opposite each other in the radial direction Z.

[0052] Specifically, in the circumferential direction Y, the protrusion 31 can adopt a continuous structure, such as a ring structure extending along the circumferential direction Y, or the protrusion 31 can adopt an intermittent arc segment.

[0053] like Figures 2 to 4 As shown, in some embodiments, a protrusion 31 is provided at one end of the washer 20 facing the nut body 11 in the axial direction X. The protrusion 31 protrudes inward from the inner sidewall of the washer 20. A tooth 41 is provided on one side of the protrusion 31 facing the nut body 11 in the axial direction X. An annular groove 32 is provided on the outer sidewall of the mounting portion 12. The groove and the tooth 41 are correspondingly provided on the groove wall of the annular groove 32.

[0054] In some optional embodiments of this application, the teeth 41 and the grooves are arranged in the above-described manner, such that the teeth 41 and the grooves are respectively disposed on two surfaces that are opposite to each other in the axial direction X, so that the teeth 41 and the grooves can be processed by simple turning or milling processes, the processing process is relatively simple, and the processing accuracy is easier to guarantee.

[0055] It should be noted that in this document, "inner" in "inner wall" and "protruding inward" refers to the direction along the radial direction Z pointing towards the axis of the mounting part 12, while "outer" in "outer wall" refers to the direction along the radial direction Z away from the axis of the mounting part 12.

[0056] like Figure 6 and Figure 8 As shown, in some embodiments, the mounting portion 12 includes a ring body 121 and an annular flange 122. The ring body 121 is connected to one end of the nut body portion 11 in the axial direction. The outer diameter of the ring body 121 is smaller than the outer diameter of the nut body portion 11. The annular flange 122 is disposed at the end of the ring body 121 facing away from the nut body portion 11 in the axial direction X. The annular flange 122, the ring body 121, and the nut body portion 11 are coaxially arranged. The annular flange 122 protrudes outward from the outer side wall of the ring body 121. The ring body 121, the annular flange 122, and the nut body portion 11 together form an annular groove 32, wherein the groove is disposed on the end face of the nut body portion 11 facing the annular flange 122 in the axial direction X.

[0057] In some optional embodiments of this application, since the ring body 121, the annular flange 122 and the nut body 11 are together arranged to form an annular groove 32, the stepped structure of the nut 10 can be reduced, and the processing difficulty of the nut 10 can be reduced.

[0058] It should be noted that in this document, "outward" in "protruding outward" refers to the direction that is radially away from the axis of the mounting part 12.

[0059] In some embodiments, the ratio of the extension dimension of the annular flange 122 to the pitch of the nut 10 along the axial direction X is between 0.2 and 0.3.

[0060] In some optional embodiments of this application, by using the above-mentioned ratio range, it is possible to reduce the size of the annular flange 122 in the axial direction X while improving the structural strength of the annular flange, so as to ensure overall strength and fastening performance.

[0061] Specifically, in some optional embodiments of this application, the ratio of the extension dimension of the annular flange 122 to the pitch of the nut 10 along the axial direction X can be any value among 0.2, 0.225, 0.25, 0.275, and 0.3.

[0062] like Figure 2 , Figure 5 , Figure 6 as well as Figure 8 As shown, in some embodiments, the outer diameter of the annular flange 122 is smaller than the outer diameter of the nut body portion 11.

[0063] like Figures 1 to 4 , Figure 7 , Figure 9 as well as Figure 10 As shown, in some embodiments, the washer 20 includes a conical body 21 and an outer flange 22. The conical body 21 is sleeved on the mounting part 12 and the conical body 21 is rotatably engaged with the mounting part 12. A protrusion 31 or an annular groove 32 is provided on the conical body 21. In the axial direction X and in the direction from the mounting part 12 to the nut body 11, the conical body 21 gradually shrinks inward. The outer flange 22 is provided at one end of the conical body 21 in the axial direction X away from the nut body 11. The outer flange 22 protrudes outward from the outer side wall of the conical body 21 and is used to abut against the connected part.

[0064] In some optional embodiments of this application, by providing an outward flange 22, the contact area between the washer 20 and the connected component can be increased, thereby increasing the friction between the washer 20 and the connected component.

[0065] Specifically, in the circumferential direction Y, the outer flange 22 can adopt a continuous structure (e.g., a ring structure extending along the circumferential direction Y), or the outer flange 22 can adopt a discontinuous structure (e.g., an intermittent arc segment).

[0066] like Figure 10 As shown, in some embodiments, the outer flange 22 includes a first annular structure that extends along the circumferential direction Y.

[0067] In some optional embodiments of this application, the use of a first annular structure can reduce the stress concentration factor between the outer flange and the connected parts, thereby improving the fatigue resistance of the fastening and anti-loosening assembly.

[0068] like Figure 2 As shown, in some embodiments, the outer flange 22 is provided with a first rounded chamfer 221 along the axial direction X away from the nut body portion 11.

[0069] In some optional embodiments of this application, the first rounded chamfer 221 is provided so that the end of the outer flange 22 that is away from the nut body 11 in the axial direction X provides a smooth contact surface. When the material of the connected parts is relatively soft copper or aluminum alloy, tightening the anti-loosening assembly can prevent the outer flange 22 from scraping up metal debris on the surface of the connected parts, thus preventing serious consequences such as short circuits and arc discharge caused by metal debris in a high-voltage electric environment.

[0070] like Figure 3 , Figure 4 as well as Figure 10 As shown, in some embodiments, the fastening and anti-loosening assembly includes at least two teeth 41 spaced apart along the circumferential direction Y, and at least two grooves, each tooth 41 being able to extend into one of the at least two grooves.

[0071] In some optional embodiments of this application, by providing at least two teeth 41 at intervals along the circumferential direction Y, the force can be shared by at least two teeth 41 without changing the total force on all teeth 41, thereby reducing the force on a single tooth 41.

[0072] In some optional embodiments of this application, the number of grooves is the same as the number of teeth 41, and the teeth 41 are provided in a one-to-one correspondence with the grooves.

[0073] In some optional embodiments of this application, the number of grooves and the number of teeth 41 are both 30.

[0074] like Figure 10 As shown, in some embodiments, at least two teeth 41 are evenly distributed in the circumferential direction Y, and at least two grooves are evenly distributed in the circumferential direction Y.

[0075] In some optional embodiments of this application, the above-described uniformly distributed arrangement can provide a uniform anti-loosening effect in the circumferential direction Y.

[0076] In some embodiments, the tooth pitch between two adjacent teeth 41 disposed in the circumferential direction Y is between 0.5 mm and 1.0 mm.

[0077] In some optional embodiments of this application, the above-mentioned tooth pitch range is used so that the tooth arrangement density of the tooth portion 41 can achieve effective meshing, while reducing the excessive cutting of the nut body portion 11 caused by the groove.

[0078] Specifically, in some optional embodiments of this application, the tooth pitch between two adjacent teeth 41 in the circumferential direction Y can be any value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1.0mm.

[0079] It should be noted that the tooth pitch between two adjacent teeth 41 in the circumferential direction Y refers to the arc length between the same side surfaces of the two adjacent teeth 41 in the circumferential direction Y.

[0080] In some embodiments, the tooth width of the tooth portion 41 is between 0.3 mm and 0.6 mm, and the width of the groove portion is between 0.8 mm and 1.2 mm.

[0081] In some optional embodiments of this application, the tooth portion 41 with the above-mentioned tooth width range and the groove portion with the above-mentioned width range are used so that the tooth portion 41 has sufficient strength to achieve effective engagement, while the width of the groove portion can accommodate the insertion of the tooth portion 41, and the setting of the groove portion reduces the excessive cutting of the nut body portion 11.

[0082] It should be noted that the tooth width of the tooth portion 41 refers to the dimension of the tooth portion 41 in the circumferential direction Y. Specifically, the tooth width of the tooth portion 41 gradually decreases from the outside to the inside. The width of the groove portion refers to the dimension of the groove portion in the circumferential direction Y. Specifically, the width of the groove portion gradually decreases from the outside to the inside.

[0083] "From the outside to the inside" refers to the direction along the radial direction Z pointing towards the axis of the mounting part 12.

[0084] Specifically, in some optional embodiments of this application, the tooth width of the tooth portion 41 can be any value among 0.3mm, 0.4mm, 0.5mm and 0.6mm, and the width of the groove portion can be any value among 0.8mm, 0.9mm, 1.0mm, 1.1mm and 1.2mm.

[0085] In some embodiments, the tooth height of the tooth portion 41 is between 0.2 mm and 0.4 mm, and the depth of the groove portion is between 0.5 mm and 1.0 mm.

[0086] In some optional embodiments of this application, the tooth portion 41 with the tooth height range and the groove portion with the depth range are used so that the tooth portion 41 has sufficient height to be embedded in the groove portion, and the setting of the groove portion reduces the excessive cutting of the nut body portion 11.

[0087] It should be noted that the tooth height of tooth 41 refers to the distance between the two ends of tooth 41 in the axial direction X, and the depth of groove refers to the distance between the bottom of groove and the opening of groove in the axial direction X.

[0088] Specifically, in some optional embodiments of this application, the tooth height of the tooth 41 can be any value among 0.2mm, 0.25mm, 0.3mm, 0.35mm and 0.4mm, and the depth of the groove can be any value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1.0mm.

[0089] like Figure 3 As shown, in some embodiments, the edges of the teeth 41 facing the groove are provided with a second rounded chamfer 411.

[0090] In some optional embodiments of this application, the second rounded chamfer 411 described above is provided so that the end of the tooth 41 facing the groove provides a smooth contact surface. When tightening the fastening and anti-loosening assembly, the friction between the tooth 41 and the nut body 11 is reduced, ensuring that the tooth 41 can extend into the groove in the axial direction X, thereby reducing the probability of metal debris generation.

[0091] In some optional embodiments of this application, the radius of the second rounded chamfer 411 is between 0.1 mm and 0.3 mm.

[0092] Specifically, in some optional embodiments of this application, the radius of the second rounded chamfer 411 can be any value among 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3mm.

[0093] In some embodiments, the protrusion 31 includes a second annular structure that extends in the circumferential direction Y.

[0094] In some optional embodiments of this application, the second annular structure is adopted, which can reduce the stress concentration coefficient between the protrusion 31 and the annular groove 32, improve the fatigue resistance of the fastening and anti-loosening assembly, and improve the structural strength of the protrusion 31.

[0095] In some optional embodiments of this application, the protrusion 31 is disposed at one end of the washer 20 facing the nut body portion 11 in the axial direction X, and the tooth 41 extends in the radial direction Z. One end of the tooth 41 extends to the inner edge of the second annular structure, and the other end of the tooth 41 extends to the outer edge of the washer 20. The tooth 41 is connected to the protrusion 31 and the washer 20 respectively.

[0096] like Figure 4 As shown, in some embodiments, the opening angle α of the inner hole of the washer 20 is between 22.5° and 27.5°.

[0097] In some optional embodiments of this application, the above-mentioned opening angle range enables the washer 20 to undergo elastic deformation when tightened, adapting to the surface unevenness of the connected parts, reducing stress concentration caused by surface unevenness, and enhancing the anti-rotation effect between the teeth 41 and the groove. At the same time, it avoids elastic failure caused by excessive deformation of the washer 20. A reasonable opening angle can optimize the material flow during the forming process of the washer 20, reduce the stamping difficulty, and improve the stamping manufacturability of the washer 20.

[0098] It should be noted that the opening angle α of the inner hole of washer 20 refers to the angle between the normal of the inner wall of washer 20 and washer 20.

[0099] Specifically, in some optional embodiments of this application, the opening angle of the inner hole of the washer 20 can be any value among 22.5°, 22°, 23.5°, 24°, 24.5°, 25°, 25.5°, 26°, 26.5°, 27° and 27.5°.

[0100] In some embodiments, the thickness of the gasket 20 is between 1.0 mm and 2.0 mm.

[0101] In some optional embodiments of this application, the washer 20 with the thickness range described above is used so that the washer 20 has sufficient rigidity when subjected to axial force, while also having a certain degree of elasticity, so that the washer 20 can effectively absorb vibration and disperse stress.

[0102] Specifically, in some optional embodiments of this application, the thickness of the washer 20 can be any value among 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2.0 mm.

[0103] like Figure 1 As shown, in some embodiments, the nut body 11 includes a hexagonal nut.

[0104] In some alternative embodiments of this application, the hexagonal nut facilitates the application of torque using standard tools such as wrenches.

[0105] In some embodiments, the nut body 11 and the mounting portion 12 are an integral structure.

[0106] In some optional embodiments of this application, the nut body 11 and the mounting part 12 are an integral structure, which can improve the overall strength and fastening performance of the nut 10.

[0107] The fastening and anti-loosening assembly provided in this embodiment has the following beneficial effects:

[0108] (1) By inserting the tooth 41 into the groove along the axial direction X, the tooth 41 and the groove form a mechanical lock in the circumferential direction Y. Even in a high vibration or high impact environment, since the tooth 41 can always be inserted into the groove, the tooth 41 and the groove can always form a mechanical lock in the circumferential direction Y, so as to prevent the nut 10 from reversing relative to the washer 20, the anti-loosening function can be maintained. This means that the fastening and anti-loosening assembly provided in this embodiment can reduce nut loosening and improve connection reliability in a high vibration or high impact environment.

[0109] (2) By using the teeth 41 and the groove to form a mechanical lock in the circumferential direction Y, the friction required for the anti-loosening performance between the nut 10 and the washer 20 is reduced, thereby reducing the preload required when tightening the nut 10, reducing the assembly requirements of the fastening and anti-loosening assembly, and making it easy to install.

[0110] (3) Under repeated temperature cycles and mechanical stress, the toothed part 41 and the grooved part form a mechanical lock in the circumferential direction Y, which can reduce the requirement that the washer 20 is not prone to deformation or material fatigue under repeated temperature cycles and mechanical stress, reduce the material requirements and manufacturing process of the washer 20, and save costs.

[0111] (4) By utilizing the mechanical locking formed between the tooth 41 and the groove in the circumferential direction Y, even in environments with frequent temperature cycles and extreme temperatures, the tooth 41 can always be inserted into the groove, so that the tooth 41 and the groove can always form a mechanical locking in the circumferential direction Y, thus maintaining the anti-loosening function, avoiding uneven distribution of surface pressure between the connected parts that were originally in close contact, avoiding reduction of the actual contact area, avoiding contact resistance or loosening of the connection, and avoiding limited current flow.

[0112] Based on the above, the fastening and anti-loosening assembly has good resistance to vibration or impact, is not prone to loosening, can ensure the reliability of electrical connection, and achieves low-cost, assembly-friendly, and highly reliable threaded connection.

[0113] Currently, in high-current transmission applications, copper busbars are typically used to achieve current flow.

[0114] like Figure 11 As shown, another embodiment of this application provides an energy storage inverter, which includes a circuit board 50, a copper busbar 60, a stud 70, and a fastening and anti-loosening assembly as described above. A terminal 51 is connected to one side of the circuit board 50, and the copper busbar 60 is disposed on the side of the terminal 51 away from the circuit board 50. The stud 70 passes through the terminal 51 and the copper busbar 60, and one end of the stud 70 is connected to the terminal 51. The nut 10 of the fastening and anti-loosening assembly is sleeved on the stud 70 and threadedly engaged with the stud 70. The nut 10 is located on the side of the copper busbar 60 away from the terminal 51, and the nut body 11 is located at the end of the mounting part 12 away from the copper busbar 60.

[0115] Using the energy storage inverter provided in this embodiment, the nut 10 and copper busbar 60 can also apply axial force to the washer 20, causing the washer 20 to deform under pressure. This causes the washer 20 to apply a reaction force to the nut body 11, making the nut body 11 and stud 70 mesh tightly. Furthermore, by inserting the tooth 41 into the groove along the axial direction X, the tooth 41 and the groove form a mechanical lock in the circumferential direction Y. Even under high vibration or high impact environments, since the tooth 41 can always be inserted into the groove, the tooth 41 and the groove can always form a mechanical lock in the circumferential direction Y, preventing the nut 10 from reversing relative to the washer 20. This maintains the anti-loosening function, allowing the fastening and anti-loosening assembly provided in this embodiment to reduce nut loosening and improve connection reliability under high vibration or high impact environments. It also ensures that the terminal 51 and copper busbar 60 achieve a preset contact resistance, preventing the energy storage inverter from smoking or catching fire due to high contact resistance.

[0116] In some optional embodiments of this application, the energy storage inverter also includes a flat washer, which is sleeved on the stud 70. The flat washer is located on the side of the copper busbar 60 away from the terminal 51 and on the side of the mounting portion 12 away from the nut body portion 11. The flat washer can protect the surface of the copper busbar 60, reduce contact resistance, or provide insulation.

[0117] Specifically, first, align the parts to be connected on the copper busbar 60 and terminal 51 to ensure that the contact surfaces of the copper busbar 60 and terminal 51 are flat and tightly fitted. Then, pass the stud 70 through the pre-drilled holes on the copper busbar 60 and terminal 51, so that the stud 70 passes through the copper busbar 60 and terminal 51, and rivet one end of the stud 70 to the terminal 51. Next, put the flat washer on the stud 70, with the flat washer located on the side of the copper busbar 60 away from the terminal 51. Then, place the fastening and anti-loosening assembly with the nut body 11 located on the side of the mounting part 12 away from the flat washer. Tighten the nut 10 to the end of the external threaded connector, so that the nut 10 and the connected part apply an axial force to the washer 20. The washer 20 is compressed and deformed, so that the washer 20 applies a reaction force to the nut body 11, so that the nut body 11 is tightened with the bolt, and the teeth 41 are inserted into the groove in the axial direction X.

[0118] In some optional embodiments of this application, the energy storage inverter is a 320KW energy storage inverter, the thread specification of the nut of the fastening anti-loosening assembly is M8, and the terminal 51 includes a saddle terminal.

[0119] By applying the energy storage inverter provided in this embodiment, the following test and simulation data can be obtained:

[0120] (1) Room temperature yield strength test: According to GB / T94.4, the yield strength of washer 20 is about 24KN, which is much greater than the yield strength of open spring washer of the same specification (420N);

[0121] (2) Deformation test after high temperature aging: In accordance with GB / T94.4, the washer 20 of the fastening and anti-loosening assembly with M8 thread is heated to 100℃ for 48 hours, and then 18600N axial pressure is applied to the washer 20. After resting for 2 minutes, the test is repeated five times. The deformation of the washer 20 in the axial direction X is less than 0.1mm. The deformation of the disc gasket of the same specification defined in GBT9074.31 under the same test conditions is more than 5 times that of the washer 20 of the same specification.

[0122] (3) Residual torque and contact resistance of the whole machine before and after load: The energy storage inverter is a 320KW energy storage inverter, the thread specification of nut 10 is M8, the contact resistance value is less than 50μΩ according to MIL-DTL-81706B test, and the residual torque decay is less than 80% according to VDI2645-part3 test.

[0123] (4) Cleanliness test: No visible metal debris was found between washer 20 and nut 10 or between washer 20 and copper busbar 60 during the assembly process of the energy storage inverter.

[0124] (5) Finite element simulation of copper busbar flow surface: Comparing the flow surface pressure of three fasteners (the fastening and anti-loosening assembly provided in this embodiment, the same specification hexagonal nut and the same specification hexagonal flange) under the same connection scenario and the same preload, the pressure threshold is 20 MPa as defined by BSEN50343. The fastening and anti-loosening assembly provided in this embodiment has the largest effective contact area for flow.

[0125] It should be noted that the energy storage inverter provided in this application embodiment has the beneficial effects of the fastening and anti-loosening assembly in any of the foregoing embodiments. For details, please refer to the foregoing description of the beneficial effects of the fastening and anti-loosening assembly. This application embodiment will not repeat the description.

[0126] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit the invention. Any person skilled in the art to which this application pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

[0127] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, substitutions for other connection methods described above can be made by referring to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A fastening and anti-loosening assembly, characterized in that, include: A nut includes a nut body and a mounting portion, wherein the mounting portion is connected to one end of the nut body in the axial direction and is coaxially disposed with the nut body; A washer is fitted onto the mounting portion and rotates with the mounting portion. In the axial direction and from the mounting portion toward the nut body portion, the washer gradually contracts inward. The end of the washer facing away from the nut body portion in the axial direction is used to abut against the connected part. The mounting part and the washer are provided with a protrusion, and the other of the mounting part and the washer are provided with an annular groove. The annular groove extends circumferentially along the nut body. The protrusion is inserted into the annular groove and has rotational freedom relative to the groove wall of the annular groove in the circumferential direction of the nut body. The annular groove has teeth on one of its walls and the protrusion, and the protrusion has a groove on the other of its walls. The teeth can be inserted into the groove along the axial direction and abut against the groove wall in the circumferential direction.

2. The fastening and anti-loosening assembly according to claim 1, characterized in that, The protrusion is located at one end of the washer facing the nut body in the axial direction. The protrusion protrudes inward from the inner sidewall of the washer. The tooth is located on the side of the protrusion facing the nut body in the axial direction. The annular groove is located on the outer sidewall of the mounting part. The groove and the tooth are correspondingly located on the groove wall of the annular groove.

3. The fastening and anti-loosening assembly according to claim 2, characterized in that, The mounting part includes: A ring body is connected to one end of the nut body in the axial direction, and the outer diameter of the ring body is smaller than the outer diameter of the nut body. An annular flange is provided at one end of the ring body away from the nut body in the axial direction. The annular flange, the ring body, and the nut body are coaxially arranged. The annular flange protrudes outward from the outer side wall of the ring body. The ring body, the annular flange, and the nut body together form the annular groove. The groove is provided on the end face of the nut body facing the annular flange along the axial direction.

4. The fastening anti-loosening assembly according to claim 3, characterized in that The outer diameter of the annular flange is smaller than the outer diameter of the nut body.

5. The fastener anti-loosening assembly according to claim 1, wherein The washer includes: A conical cylinder body is sleeved on the mounting part, and the conical cylinder body is rotatably engaged with the mounting part. The protrusion or the annular groove is provided on the conical cylinder body. In the axial direction and in the direction from the mounting part to the nut body, the conical cylinder body gradually contracts inward. An outward flange is provided at one end of the cone body that is away from the nut body along the axial direction. The outward flange protrudes outward from the outer side wall of the cone body and is used to abut against the connected part.

6. The fastening and anti-loosening assembly according to claim 5, characterized in that, The outward flange includes a first annular structure that extends along the circumferential direction; and / or, The outer flange has a first rounded chamfer along its axial direction away from the nut body.

7. The fastening and anti-loosening assembly according to claim 1, characterized in that, The fastening and anti-loosening assembly includes at least two teeth spaced apart along the circumferential direction, and at least two grooves, each tooth being able to extend into one of the at least two grooves.

8. The fastening anti-loosening assembly according to claim 7, characterized in that At least two of the teeth are evenly distributed in the circumferential direction, and at least two of the grooves are evenly distributed in the circumferential direction.

9. The fastening and anti-loosening assembly according to claim 1, characterized in that, The edges of the teeth facing the groove are each provided with a second rounded chamfer; and / or The protrusion includes a second annular structure that extends along the circumferential direction.

10. The fastening and anti-loosening assembly according to claim 1, characterized in that, The nut body includes a hexagonal nut; and / or, The nut body and the mounting part are an integral structure.

11. An energy storage inverter, characterized by, include: A circuit board, one side of which is connected to a terminal; A copper busbar is disposed on the side of the terminal opposite to the circuit board; A stud is inserted through the terminal and the copper busbar, with one end of the stud connected to the terminal; According to any one of claims 1 to 10, the fastening and anti-loosening assembly has a nut sleeved on the stud and threadedly engaged with the stud, the nut being located on the side of the copper busbar away from the terminal, and the nut body being located at the end of the mounting portion away from the copper busbar.

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