Elastic crimping assembly and power module

Abstract

The utility model relates to the technical field of heat dissipation of power devices, and discloses an elastic crimping assembly and a power module. The elastic crimping assembly comprises an end plate, an elastic compression piece and a positioning piece, the end plate is provided with a limiting piece and a first limiting part which are arranged at an interval up and down, and the lower surface of the limiting piece is a second limiting part; the elastic compression piece is configured to abut against the power device; the height of the positioning piece between the first limiting part and the second limiting part is adjustable, and the positioning piece can compress the elastic compression piece. The elastic crimping assembly can eliminate the deviation of the stroke starting point position caused by the height error of the elastic compression piece in the free state, and ensures the accuracy of crimping force.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation of power devices, in particular to an elastic pressing component and a power module. Background Art

[0002] With the continuous advancement of power electronics technology, the demand for high-current, high-capacity converters is increasing. In converters, the power devices in their power modules dissipate heat by contacting the surface of the heat sink. This is typically achieved by applying a crimping force generated by the compression of an elastic compression element to maintain a tight fit between the two. The magnitude of this crimping force is a key factor influencing the tightness of the fit. However, excessive pressure can directly damage the power device, while insufficient pressure can easily lead to a loose fit between the power device and the heat sink, resulting in poor heat dissipation and, consequently, damage to the heat sink. Therefore, the crimping force must be controlled within a reasonable range. Utility Model Content

[0003] One purpose of the present utility model is to provide an elastic crimping assembly that can control the magnitude of the crimping force within a reasonable range, eliminate the offset of the stroke starting point position caused by the height error of the elastic compression member in the free state, and ensure the accuracy of the crimping force.

[0004] Another object of the present invention is to provide a power module, which can ensure the accuracy of the pressing force of the elastic pressing assembly on the power device by providing the above-mentioned elastic pressing assembly.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] Spring crimping assembly, comprising:

[0007] An end plate, wherein a limiting member and a first limiting portion are arranged in an upper and lower intervals, and a lower surface of the limiting member serves as the second limiting portion;

[0008] an elastic compression member configured to abut against the power device;

[0009] A positioning member is height-adjustable between the first limiting portion and the second limiting portion and is capable of compressing the elastic compression member.

[0010] As an optional solution, the end plate is provided with a mounting hole and a guide hole that are connected and pass through the end plate together, the aperture of the mounting hole is larger than the aperture of the guide hole, and a first step surface is formed at the intersection of the mounting hole and the guide hole, and the first step surface is the first limiting portion.

[0011] As an optional solution, the mounting hole includes a first hole and a second hole that are connected to each other, the second hole is located between the first hole and the guide hole, the diameter of the first hole is larger than the diameter of the second hole, so as to form a second step surface at the intersection of the first hole and the second hole, and the limiting member is connected to the first hole and can abut against the second step surface.

[0012] As an optional solution, the limit member is threadedly connected to the first hole, and a plurality of scale values ​​are provided on the end plate, and the plurality of scale values ​​are evenly distributed around the circumference of the limit member. A pointer is provided on the limit member, and the scale value pointed to by the pointer represents the distance from the limit member to the second step surface.

[0013] As an optional solution, the elastic compression member includes a guide column and multiple elastic members, one end of the guide column is passed through the guide hole and connected to the positioning member, and the multiple elastic members are sleeved on the guide column and limited between the guide column and the end plate.

[0014] As an optional solution, the positioning member and the guide column are connected by a threaded connection or a snap connection.

[0015] As an optional solution, the guide post is arranged in the guide hole in an adjustable manner.

[0016] As an optional solution, the elastic compression member further includes a locking member, which is passed through and threadedly connected to the guide column, and one end of the locking member is configured to abut against the power device.

[0017] As an optional solution, both the limiting member and the positioning member are provided with a penetrating avoidance hole, the avoidance hole is used to avoid the locking member, and the diameter of the avoidance hole on the limiting member is smaller than the maximum outer diameter of the positioning member.

[0018] As an optional solution, a limiting protrusion is provided on one of the peripheral side of the guide column and the side wall of the guide hole, and a limiting groove is provided on the other of the two, and the limiting protrusion is plugged into and fits with the limiting groove.

[0019] As an optional solution, the guide column includes a guide column body and a baffle, one end of the guide column body is connected to the positioning piece, the baffle is connected to the side of the guide column body away from the positioning piece, part of the guide column body cooperates with the guide hole, the outer diameter of the baffle is larger than the outer diameter of the guide column body, and the elastic member is sleeved on the guide column body and limited between the baffle and the end plate.

[0020] As an optional solution, the positioning member includes a connecting portion and an abutting portion, the abutting portion is located on the lower side of the limiting member, the connecting portion is connected to the side of the abutting portion away from the limiting member, the connecting portion is fixedly connected to the guide column, the outer diameter of the abutting portion is larger than the outer diameter of the connecting portion, and the abutting portion can switch between a position abutting against the first step surface and a position abutting against the limiting member.

[0021] A power module includes a frame, a heat sink, power devices and the above-mentioned elastic pressing assembly. The power devices are stacked in the frame, the heat sink is fitted between two adjacent power devices, the elastic pressing assembly is arranged at one end of the frame, and the elastic pressing assembly is pressed onto one of the power devices at the end.

[0022] The beneficial effects of the utility model are:

[0023] The elastic crimping assembly provided by the present invention can control the magnitude of the crimping force within a reasonable range. By setting the first limiting portion and the second limiting portion, the upward stroke and the downward stroke of the positioning member are determined. Since the distance between the first limiting portion and the second limiting portion is determined, the stroke of the positioning member is also determined. Therefore, the deformation amount of the elastic compression member each time is also determined, thereby ensuring that the crimping force each time is basically the same, thereby ensuring the accuracy of the crimping force for the power device each time, and eliminating the inaccurate crimping force caused by the height error of the elastic compression member in the free state.

[0024] The power module provided by the present invention ensures that the power device and the heat sink are closely fitted by providing the elastic pressing assembly, thereby ensuring the heat dissipation effect and ensuring the accuracy of the pressing force of the elastic pressing assembly on the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly and easily, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of a power module provided by an embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0028] Figure 3 This is a cross-sectional view of the elastic crimping assembly provided by the embodiment of the utility model Figure 1 ;

[0029] Figure 4 This is a cross-sectional view of the elastic crimping assembly provided by the embodiment of the utility model Figure 2 ;

[0030] Figure 5 This is a schematic diagram of the cooperation between the guide post and the guide hole provided in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic structural diagram of the end plate provided by an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of the cooperation between the end plate and the limiting member provided by the embodiment of the utility model;

[0033] Figure 8 It is a cross-sectional view of an elastic crimping assembly provided in another embodiment of the present invention.

[0034] In the picture:

[0035] 100, elastic pressing assembly; 200, frame; 300, heat sink; 400, power device;

[0036] 10. End plate; 101. First limiting portion; 102. Second limiting portion; 11. Mounting hole; 111. First hole; 112. Second hole; 12. Guide hole; 121. Limiting groove; 13. First step surface; 14. Second step surface; 15. Scale value;

[0037] 20. Limiting piece; 21. Pointer; 22. Avoidance hole;

[0038] 30. Positioning member; 31. Connecting portion; 311. Buckle; 32. Abutting portion;

[0039] 40. Elastic compression member; 41. Guide post; 411. Guide post body; 4111. Threaded hole; 4112. Slot; 412. Baffle; 413. Limiting protrusion; 42. Elastic member; 43. Locking member. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0041] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] like Figure 1 As shown, this embodiment provides an elastic crimping assembly 100 for use in a power module. The assembly is primarily used to crimp a power device 400 of the power module, ensuring that the device 400 is tightly attached to the surface of the heat sink 300 for heat dissipation. The power module can be a power module for a converter or other device, without specific limitation herein.

[0045] Specifically, if Figure 2As shown, the elastic crimping assembly 100 includes an end plate 10, an elastic compression member 40 and a positioning member 30. The end plate 10 is provided with a limit member 20 and a first limit portion 101 spaced apart from each other. The lower surface of the limit member 20 is the second limit portion 102, and the first limit portion 101 is located on the lower side of the second limit portion 102; the elastic compression member 40 is configured to abut against the power device 400; the positioning member 30 is height-adjustable between the first limit portion 101 and the second limit portion 102 and can compress the elastic compression member 40. The inner ring size of the first limit portion 101 and the second limit portion 102 are both smaller than the outer ring size of the positioning member 30, so that the positioning member 30 can abut against the first limit portion 101 or the second limit portion 102. Specifically, the positioning member 30 can switch between the upper limit position and the lower limit position, as shown in FIG. Figure 3 As shown, when in the lower limit position, the positioning member 30 abuts against the first limiting portion 101, as shown in FIG. Figure 4 As shown, when in the upper limit position, the positioning member 30 abuts against the second limiting portion 102. The first limiting portion 101 is used to limit the positioning member 30 at the lower limit position, and the second limiting portion 102 is used to limit the positioning member 30 at the upper limit position. Since the elastic compression member 40 can abut against the power device 400, the pressing force generated by the compression of the elastic compression member 40 can be applied to the power device 400.

[0046] It is understandable that due to production errors, there will be height errors in each elastic compression part 40 in the free state. The crimping force calibration method in the prior art does not take into account the offset of the starting position of the stroke caused by the height error of the elastic compression part 40 in the free state, but only calibrates the compression stroke by the end position. Therefore, the crimping force is not accurate enough.

[0047] The elastic crimping assembly 100 provided in this embodiment can control the magnitude of the crimping force within a reasonable range. When in use, the elastic compression member 40 is first installed on the end plate 10 so that the crimping force applied by the elastic compression member 40 to the power device 400 is exactly zero. Then, the positioning member 30 is adjusted to the lower limit position abutting against the first limiting portion 101 to limit the positioning member 30, and at the same time, it is connected to the elastic compression member 40 to eliminate the inaccurate crimping force caused by the height error of the elastic compression member 40 in the free state. Then, the positioning member 30 is moved axially upward until the positioning member 30 moves to the upper limit position abutting against the second limiting portion 102. At this time, the stroke compression of the elastic compression member 40 is completed, and the crimping force of the elastic compression member 40 is applied to the power device 400, ensuring that the power device 400 fits tightly with the radiator 300, thereby ensuring good heat dissipation. By setting the first limiting portion 101 and the second limiting portion 102, the upward stroke and the downward stroke of the positioning member 30 are determined. Since the distance between the first limiting portion 101 and the second limiting portion 102 is determined, the stroke of the positioning member 30 is also determined. Therefore, the deformation amount of the elastic compression member 40 each time is also determined, thereby ensuring that the crimping force each time is basically the same, thereby ensuring the accuracy of the crimping force for the power device 400 each time, and eliminating the inaccurate crimping force caused by the height error of the elastic compression member 40 in the free state.

[0048] Specifically, if Figure 2 As shown, in an optional embodiment, the end plate 10 is provided with a mounting hole 11 and a guide hole 12 that are connected and pass through the end plate 10. The diameter of the mounting hole 11 is larger than the diameter of the guide hole 12, and a first step surface 13 is formed at the intersection of the mounting hole 11 and the guide hole 12. The first step surface 13 is the first limiting portion 101 mentioned above. The limiting member 20 is detachably arranged in the mounting hole 11, and the positioning member 30 is height-adjustable between the first step surface 13 and the limiting member 20. In other words, as Figure 3 As shown, when in the lower limit position, the positioning member 30 abuts against the first step surface 13, as shown in FIG. Figure 4 As shown, when in the upper limit position, the positioning member 30 abuts against the lower surface of the limiting member 20 .

[0049] In an optional embodiment, if Figure 2As shown, the elastic compression member 40 includes a guide post 41, a plurality of elastic members 42 and a locking member 43. One end of the guide post 41 is passed through the guide hole 12 and connected to the positioning member 30. The plurality of elastic members 42 are sleeved on the guide post 41 and limited between the guide post 41 and the end plate 10. The locking member 43 is passed through and threadedly connected to the guide post 41. One end of the locking member 43 is configured to abut against the power device 400. By screwing the locking member 43, the guide post 41 can be adjusted in height in the guide hole 12. The elastic member 42 can be a disc spring, a spring, etc. In this embodiment, a disc spring is used as an example for explanation. Among them, there are preferably three disc springs. In other embodiments, the number of disc springs can also be adaptively adjusted according to the requirements of the crimping force, and no specific limitation is made here.

[0050] In the prior art, commonly used methods for calibrating the crimping force include calibrating the end point of the disc spring's compression stroke. This method obtains the position of the end point of the compression stroke when the disc spring generates the required crimping force through theoretical calculation. When the disc spring is compressed to this end point, it means that the crimping force generated by the disc spring reaches the required value. However, due to production errors, different disc springs of the same model may have different heights in the free state, so the starting point of the stroke may be offset. If compression is performed only at the same end point each time, the resulting crimping force may be different. Therefore, this method does not take into account the offset of the starting point of the stroke caused by the height error of the disc spring in the free state. The compression stroke is only calibrated by the end point, and the crimping force is not accurate enough.

[0051] In the elastic compression assembly 100 provided in this embodiment, since the bottom end of the locking member 43 can abut against the power device 400, the compression force generated by the compressed disc spring can be applied to the power device 400 through the locking member 43. Since the positioning member 30 and the guide post 41 are threadedly connected, when in use, the elastic compression member 40 is first installed on the end plate 10, and the axial movement of the guide post 41 can be achieved by screwing the locking member 43 so that the locking member 43 just abuts against the power device 400 and just does not apply compression force to it. Then, as shown in FIG. Figure 3 As shown, the positioning member 30 is screwed to the lower limit position abutting against the first step surface 13 to limit the positioning member 30, thereby eliminating the inaccurate pressing force caused by the height error of each disc spring in the free state, thereby ensuring the accuracy of the pressing force for the power device 400; then, by rotating the locking member 43, the guide column 41 drives the positioning member 30 to move axially upward along the thread of the locking member 43 until the positioning member 30 moves to the upper limit position abutting against the limiting member 20, as shown in FIG. Figure 4 As shown, at this time, the disc spring stroke compression is completed, and the pressing force of the disc spring is applied to the power device 400 through the locking member 43, ensuring that the power device 400 and the heat sink 300 are tightly fitted, thereby ensuring good heat dissipation.

[0052] Therefore, each time the crimping force is calibrated by the elastic crimping assembly 100, the upper and lower strokes of the positioning member 30 are determined by setting the first limiting portion 101 and the second limiting portion 102, that is, the first step surface 13 and the lower surface of the limiting member 20. By screwing the locking member 43, the positioning member 30 and the guide column 41 can be moved up and down, thereby realizing compression of the disc spring. The operation is convenient, and since the distance between the first step surface 13 and the limiting member 20 is determined, the stroke of the positioning member 30 is also determined. Therefore, the deformation amount of the disc spring is also consistent each time, thereby ensuring that the crimping force each time is basically the same, thereby ensuring the accuracy of the crimping force for the power device 400 each time, and eliminating the inaccurate crimping force caused by the height error of the disc spring in the free state. It is worth noting that the locking member 43 can be a screw or a bolt. By abutting against the power device 400, the locking member 43 can avoid axial movement of the locking member 43 when the locking member 43 is screwed, but instead drives the guide column 41 to move axially, and at the same time, the crimping force of the disc spring can be applied to the power device 400 through the locking member 43.

[0053] The guide post 41 is fixedly arranged in the guide hole 12 in the circumferential direction. In order to prevent the guide post 41 from rotating when the locking member 43 is screwed, in an optional embodiment, Figure 5 As shown, a limiting protrusion 413 can be provided on the circumference of the guide post 41, and a limiting groove 121 can be provided on the side wall of the guide hole 12. When the guide post 41 cooperates with the guide hole 12, the limiting protrusion 413 and the limiting groove 121 are plugged into each other, thereby limiting the guide post 41 from rotating in the guide hole 12. In another optional embodiment, a limiting groove 121 is provided on the circumference of the guide post 41, and a limiting protrusion 413 that plugs into the limiting groove 121 is provided on the side wall of the guide hole 12. This can also achieve the above-mentioned effect, and no specific limitation is made here. In another optional embodiment, the cross-sectional shape of the guide hole 12 and the guide post 41 can be set to a non-circular shape, such as a quadrilateral, pentagon or hexagon, etc., which can also limit the guide post 41 from rotating in the guide hole 12.

[0054] In an optional embodiment, if Figure 3 As shown, the mounting hole 11 includes a first hole 111 and a second hole 112 that are coaxially connected. The second hole 112 is located between the first hole 111 and the guide hole 12. The diameter of the first hole 111 is larger than the diameter of the second hole 112, so as to form a second step surface 14 at the junction of the first hole 111 and the second hole 112. The limiting member 20 is connected to the first hole 111 and can abut against the second step surface 14. In other words, the first hole 111, the second hole 112 and the guide hole 12 together constitute a stepped hole with successively decreasing diameters. The second step surface 14 is the lower limit position of the limiting member 20, the first step surface 13 is the lower limit position of the positioning member 30, and the limiting member 20 is the upper limit position of the positioning member 30. In an optional embodiment, as Figure 4 and Figure 6 As shown, the first hole 111 is provided with an internal thread, and the limiting member 20 is provided with an external thread. The limiting member 20 is threadedly connected to the first hole 111, thereby achieving a stable connection of the limiting member 20 and convenient disassembly and assembly.

[0055] In an optional embodiment, if Figure 6 and Figure 7 As shown, the end plate 10 is provided with a plurality of scale values ​​15, and the plurality of scale values ​​15 are evenly arranged around the circumference of the limit member 20. The limit member 20 is provided with a pointer 21, and the scale value 15 pointed to by the pointer 21 represents the distance between the limit member 20 and the second step surface 14. Among them, different scale values ​​15 indicate different distances from the lower surface of the limit member 20 to the second step surface 14. Different distances from the lower surface of the limit member 20 to the second step surface 14 indicate different upper limit positions of the positioning member 30, and also indicate different crimping forces generated by the disc spring. The relationship between the scale value 15 and the crimping force is preset in advance. The operator can directly screw the limit member 20 into the first hole 111 according to the crimping force requirements, so that the pointer 21 on the limit member 20 points to different scale values ​​15, thereby adjusting the distance between the limit member 20 and the second step surface 14, so that the disc spring generates different crimping forces to meet the crimping force requirements of different power modules, which is easy to operate.

[0056] For example, Figure 6 and Figure 7 As shown, four scale values ​​15 are evenly distributed on the end plate 10, and each scale value 15 represents a different distance from the lower surface of the limiter 20 to the second step surface 14. The adjustment process of the limiter 20 is explained by taking the four scale values ​​15 as an example, and the four scale values ​​15 are defined as the first scale value to the fourth scale value, the first scale value is zero scale, matching the first crimping force, the second scale value to the fourth scale value increase in sequence, matching the second crimping force to the fourth crimping force, and the first crimping force to the fourth crimping force increase in sequence. First, screw the limiter 20 until it abuts against the second step surface 14. At this time, the pointer 21 on the limiter 20 points to the first scale value (zero scale), indicating that the distance from the limiter 20 to the second step surface 14 is zero (as shown in FIG. Figure 3The state shown in FIG3 is shown in FIG4 . At this time, the upper limit position of the positioning member 30 is the lowest. When the positioning member 30 moves to the upper limit position, the compression of the disc spring is the smallest, and the disc spring applies the first pressing force to the power device 400. When it is necessary to increase the pressing force to the second pressure-contact force, the limit member 20 is rotated to move it upward, so that the pointer 21 on the limit member 20 points to the second scale value, and the distance from the limit member 20 to the second step surface 14 is increased. At this time, the upper limit position of the positioning member 30 is slightly moved upward. When the positioning member 30 moves to the upper limit position, the compression of the disc spring increases, so that the disc spring applies the second pressing force to the power device 400. When it is necessary to increase the pressing force to the third pressure-contact force, the limit member 20 is rotated to move it further upward, so that the pointer 21 on the limit member 20 points to the third scale value. At this time, the upper limit position of the positioning member 30 is further moved upward. When the positioning member 30 moves to the upper limit position, the disc spring applies the third pressing force to the power device 400. By analogy, the disc spring generates different pressing forces to meet the pressing force requirements of different modules. In other optional embodiments, other numbers of scale values ​​15 may be evenly distributed on the end plate 10 , which can be flexibly set according to actual needs and are not specifically limited here.

[0057] In an optional embodiment, if Figure 3 and Figure 4 As shown, the positioning member 30 includes a connecting portion 31 and an abutting portion 32 that are coaxially connected. The abutting portion 32 is located on the lower side of the limiting member 20, and the connecting portion 31 is connected to the side of the abutting portion 32 away from the limiting member 20. The connecting portion 31 is fixedly connected to the guide post 41. The outer diameter of the abutting portion 32 is larger than the outer diameter of the connecting portion 31. When in the lower limit position, the abutting portion 32 abuts the first step surface 13. When in the upper limit position, the abutting portion 32 abuts the limiting member 20. By configuring the positioning member 30 into the above-mentioned stepped structure, the connecting portion 31 of the positioning member 30 is connected to the guide post 41, and the abutting portion 32 can also be easily abutted against the first step surface 13 and the limiting member 20 for limiting the position.

[0058] In an optional embodiment, if Figure 3 and Figure 4 As shown, the guide post 41 includes a coaxially connected guide post body 411 and a baffle 412. The guide post body 411 is connected to the positioning member 30, and the baffle 412 is connected to the side of the guide post body 411 away from the positioning member 30. A portion of the guide post body 411 cooperates with the guide hole 12. The outer diameter of the baffle 412 is larger than that of the guide post body 411. The disc spring is sleeved on the guide post body 411 and is limited between the baffle 412 and the end plate 10. The cooperation between the baffle 412 and the end plate 10 is used to axially limit the disc spring and apply pressure to the disc spring during the axial upward movement of the guide post 41, causing the disc spring to compress and generate a crimping force.

[0059] In an optional embodiment, the connection portion 31 of the positioning member 30 and the guide post body 411 of the guide post 41 are connected by screw threads. Figure 3 and Figure 4 As shown, a threaded hole 4111 is formed on one side of the guide post body 411 near the positioning member 30, and an external thread is formed on the connecting portion 31, which is connected to the threaded hole 4111 via the external thread. The connection portion 31 cooperates with the threaded hole 4111 on the guide post body 411 to ensure a secure connection between the positioning member 30 and the guide post 41, making assembly and disassembly easy. By screwing the positioning member 30, the height of the positioning member 30 relative to the guide post 41 can be adjusted until the positioning member 30 abuts the first step surface 13, helping to eliminate height errors of the disc spring in its free state.

[0060] In another optional embodiment, as Figure 8 As shown, the connection portion 31 of the positioning member 30 and the guide post body 411 of the guide post 41 can also be connected by a snap-fit ​​connection. Specifically, an assembly hole is provided on the side of the guide post body 411 near the positioning member 30, and a plurality of slots 4112 are axially provided on the side wall of the assembly hole. A plurality of raised snaps 311 are provided on the outside of the connection portion 31. The connection portion 31 is snapped into the slots 4112 via the snaps 311, making assembly and disassembly easy. By providing a plurality of mating snaps 311 and slots 4112, the height of the positioning member 30 relative to the guide post 41 can be adjusted, which helps to eliminate the height error of the disc spring in the free state. It should be noted that the specific number of slots 4112 and snaps 311 can be adaptively set according to actual needs and is not specifically limited here.

[0061] In an optional embodiment, if Figure 3 and Figure 4 As shown, both the limiting member 20 and the positioning member 30 are provided with a through-hole 22, which is used to avoid the locking member 43. After the elastic crimping assembly 100 is assembled, a tool can be inserted into the avoidance hole 22 to screw the locking member 43, which is convenient for operation.

[0062] Among them, such as Figure 3 and Figure 4 As shown, the diameter of the avoidance hole 22 on the limiting member 20 is smaller than the maximum outer diameter of the positioning member 30. The maximum outer diameter of the positioning member 30 refers to the outer diameter of the abutment portion 32, thereby ensuring that the abutment portion 32 can abut against the limiting member 20 for limiting position.

[0063] Combine Figures 2 to 4 The specific use process of the elastic pressing assembly 100 in this embodiment is as follows:

[0064] 1. First, screw the locking member 43 into the guide post 41 to a preset height. Then, install multiple disc springs on the guide post 41 in sequence. Then, insert the assembled guide post 41 into the guide hole 12 from the bottom of the end plate 10. Axial movement of the guide post 41 is achieved by screwing the locking member 43 so that the locking member 43 just contacts the power device 400 without applying any pressure to it.

[0065] 2. Screw the positioning member 30 into the threaded hole 4111 of the guide post 41 until the positioning member 30 abuts against the first step surface 13;

[0066] 3. Rotate the locking piece 43 in the avoidance hole 22 so that the guide column 41 drives the positioning piece 30 to move upward along the thread of the locking piece 43 until the positioning piece 30 abuts against the lower surface of the limit piece 20, completing the stroke compression of the disc spring. The pressing force of the disc spring is stably applied to the power device 400 through the locking piece 43.

[0067] like Figure 1 and Figure 2 As shown, this embodiment also provides a power module, including a frame 200, a heat sink 300, a power device 400 and the above-mentioned elastic pressing assembly 100, the power device 400 is stacked in the frame 200, the heat sink 300 is fitted between two adjacent power devices 400, the end plate 10 of the elastic pressing assembly 100 is fixedly connected to one end of the frame 200, and the locking piece 43 of the elastic pressing assembly 100 is pressed onto a power device 400 at the end.

[0068] The power module provided in this embodiment ensures that the power device 400 and the heat sink 300 are tightly fitted by providing the elastic pressing assembly 100 , thereby ensuring the heat dissipation effect and the accuracy of the pressing force of the elastic pressing assembly 100 on the power device 400 .

[0069] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Elastic crimping assembly, characterized in that, include: An end plate (10), wherein a limiting member (20) and a first limiting portion (101) are arranged in an upper and lower spaced relationship, and a lower surface of the limiting member (20) is a second limiting portion (102); An elastic compression member (40) is configured to abut against the power device (400); The positioning member (30) is height-adjustable between the first limiting portion (101) and the second limiting portion (102) and is capable of compressing the elastic compression member (40).

2. The elastic crimping assembly according to claim 1, characterized in that: The end plate (10) is provided with a mounting hole (11) and a guide hole (12) which are connected and pass through the end plate (10), the diameter of the mounting hole (11) is larger than the diameter of the guide hole (12), and a first step surface (13) is formed at the intersection of the mounting hole (11) and the guide hole (12), and the first step surface (13) is the first limiting portion (101).

3. The elastic crimping assembly according to claim 2, characterized in that: The mounting hole (11) comprises a first hole (111) and a second hole (112) which are connected to each other, the second hole (112) being located between the first hole (111) and the guide hole (12), the diameter of the first hole (111) being larger than the diameter of the second hole (112), so as to form a second step surface (14) at the intersection of the first hole (111) and the second hole (112), and the limiting member (20) is connected to the first hole (111) and can abut against the second step surface (14).

4. The elastic crimping assembly according to claim 3, characterized in that: The limiting member (20) is threadedly connected to the first hole (111); a plurality of scale values ​​(15) are provided on the end plate (10); the plurality of scale values ​​(15) are evenly arranged around the circumference of the limiting member (20); a pointer (21) is provided on the limiting member (20); the scale value (15) pointed to by the pointer (21) represents the distance from the limiting member (20) to the second step surface (14).

5. The elastic crimping assembly according to any one of claims 2 to 4, characterized in that: The elastic compression member (40) comprises a guide post (41) and a plurality of elastic members (42), one end of the guide post (41) is inserted into the guide hole (12) and connected to the positioning member (30), and the plurality of elastic members (42) are sleeved on the guide post (41) and limited between the guide post (41) and the end plate (10).

6. The elastic crimping assembly according to claim 5, characterized in that: The positioning member (30) and the guide column (41) are connected via a threaded connection or a snap connection.

7. The elastic crimping assembly according to claim 5, characterized in that: The guide post (41) is arranged in the guide hole (12) in a height-adjustable manner.

8. The elastic crimping assembly according to claim 7, characterized in that: The elastic compression member (40) further includes a locking member (43), which is passed through and threadedly connected to the guide column (41), and one end of the locking member (43) is configured to abut against the power device (400).

9. The elastic crimping assembly according to claim 8, characterized in that: The limiting member (20) and the positioning member (30) are both provided with a through-hole (22), the through-hole (22) being used to avoid the locking member (43), and the diameter of the through-hole (22) on the limiting member (20) is smaller than the maximum outer diameter of the positioning member (30).

10. The elastic crimping assembly according to claim 5, characterized in that: A limiting protrusion (413) is provided on one of the peripheral side of the guide column (41) and the side wall of the guide hole (12), and a limiting groove (121) is provided on the other of the two. The limiting protrusion (413) is plugged into and matched with the limiting groove (121).

11. The elastic crimping assembly according to claim 5, characterized in that: The guide column (41) includes a guide column body (411) and a baffle (412), one end of the guide column body (411) is connected to the positioning member (30), the baffle (412) is connected to the end of the guide column body (411) away from the positioning member (30), a portion of the guide column body (411) cooperates with the guide hole (12), the outer diameter of the baffle (412) is larger than the outer diameter of the guide column body (411), and the elastic member (42) is sleeved on the guide column body (411) and limited between the baffle (412) and the end plate (10).

12. The elastic crimping assembly according to claim 5, characterized in that: The positioning member (30) includes a connecting portion (31) and an abutting portion (32), wherein the abutting portion (32) is located at the lower side of the limiting member (20), and the connecting portion (31) is connected to a side of the abutting portion (32) away from the limiting member (20). The connecting portion (31) is fixedly connected to the guide column (41), and the outer diameter of the abutting portion (32) is larger than the outer diameter of the connecting portion (31). The abutting portion (32) can switch between a position abutting against the first step surface (13) and a position abutting against the limiting member (20).

13. A power module, characterized in that The invention comprises a frame (200), a heat sink (300), a power device (400) and an elastic pressing assembly according to any one of claims 1 to 12, wherein the power device (400) is stacked in the frame (200), the heat sink (300) is arranged between two adjacent power devices (400), the elastic pressing assembly is arranged at one end of the frame (200), and the elastic pressing assembly is pressed onto one of the power devices (400) at the end.

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