Single pipe fixing pressing block and fixing structure

Abstract

The utility model belongs to the technical field of power electronics, and particularly relates to a single-tube fixing pressing block and a fixing structure, the single-tube fixing pressing block comprises an insulating shell and a metal pressing sheet, one side of the insulating shell is provided with an opening, the top of the insulating shell is provided with a first through hole for a screw to pass through integrally, and the bottom of the insulating shell is provided with a second through hole for a screw body to pass through; a third through hole allowing a screw body to penetrate through is formed in the middle of the metal pressing piece, and one end of the metal pressing piece is bent. The metal pressing sheet is arranged in the insulating shell, the bent end of the metal pressing sheet extends out of the insulating shell along the opening and faces the same direction as the bottom of the insulating shell, and the end, located in the insulating shell, of the metal pressing sheet is used for pressing the single tube. And in addition, the device can be used for height control during single-tube welding, and the single-tube welding efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronics, and in particular relates to a single-tube fixed pressing block and a fixed structure. Background Art

[0002] Single tubes, such as IGBTs and MOS tubes, are semiconductor power devices that are compressed during assembly using a press plate, which is then secured with screws. To ensure the rigidity of the press plate meets the requirements of long-term use, the press plate is generally made of a metal with a high yield strength, such as spring steel. However, such materials are conductive, and direct contact with the surface of the single tube makes it difficult to ensure insulation under long-term use. Furthermore, one end of the press plate is secured with screws, while the other end compresses the single tube. This compression effect relies almost entirely on the elasticity of the press plate, making it difficult to guarantee long-term stability and reliability. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a single-tube fixed pressure block and a fixed structure that ensure the stability and reliability of long-term compression of a single tube, take into account insulation, and can be used for height control during single-tube welding to improve the efficiency of single-tube welding.

[0004] The present invention provides a single-tube fixing pressure block, comprising an insulating shell and a metal pressing plate, wherein an opening is provided on one side of the insulating shell, a through hole 1 for a screw to pass through as a whole is provided on the top of the insulating shell, and a through hole 2 for a screw to pass through is provided on the bottom; a through hole 3 for a screw to pass through is provided in the middle of the metal pressing plate, and one end of the metal pressing plate is bent; the metal pressing plate is arranged inside the insulating shell, and one end of the metal pressing plate that is bent extends along the opening to the outside of the insulating shell and is in the same direction as the bottom of the insulating shell, and the end of the metal pressing plate located inside the insulating shell is used for pressing the single tube.

[0005] Furthermore, a buckle 1 for engaging with a circuit board is provided on the top of the insulating shell. The buckle 1 is located at an edge of a through hole 1 and extends in a direction away from the top of the insulating shell.

[0006] Furthermore, the through hole 1 is located at one end of the top of the insulating shell, and the through hole 2 is located at one end of the bottom of the insulating shell. Both sides of the end of the insulating shell where the through hole 1 and the through hole 2 are located are tilted inwards to form a contraction shape.

[0007] Furthermore, the insulating shell includes an upper shell and a lower shell, the top of the upper shell is the top of the insulating shell, and the bottom of the lower shell is the bottom of the insulating shell. The upper shell and the lower shell are fixed by a second snap fastener, and there is a gap between one side of the lower shell and one side of the upper shell, and the area where the gap is located forms the opening.

[0008] Furthermore, the upper shell and the lower shell both include a panel and a side panel arranged on the side of the panel. The height of the side panel of the upper shell is greater than the height of the side panel of the lower shell. After the upper shell and the lower shell are fixed by the second clip, the end of the side panel of the upper shell protrudes from the bottom of the lower shell, and the side panel of the upper shell facing away from the position of the outlet is provided with a slot for the single tube pin to extend out.

[0009] Furthermore, a groove 1 is provided at one end of the lower shell away from the through hole 2, and the bottom of the lower shell at this end is divided into a corresponding number of single-tube arrangement areas by the groove 1. A partition is provided on the side of the upper shell facing the lower shell, and the partition extends along the groove 1 and protrudes from the bottom of the lower shell.

[0010] Furthermore, a second groove is provided at one end of the metal pressing plate located inside the insulating shell corresponding to the position of the first groove, and the end of the metal pressing plate is divided into the same number of pressure areas as the single tube arrangement areas by the second groove.

[0011] Furthermore, the second buckle is arranged on a side of the upper shell facing the lower shell, and the second buckle is passed through the first groove and hooked on the bottom of the lower shell.

[0012] The utility model also provides a single-tube fixing structure, including a single tube, a circuit board, a radiator, a ceramic substrate and a screw, and also includes the single-tube fixing block as mentioned above, the single-tube fixing block is located on the side of the circuit board facing the single tube and is connected to the circuit board, the bottom of the insulating shell is set toward the single tube, the side of the single tube used for heat dissipation faces the radiator and contacts the ceramic substrate arranged on the radiator, the screw is passed through through hole one in through hole two and through hole three and is connected to the radiator, and the end of the metal pressing plate located inside the insulating shell presses the single tube through the bottom of the insulating shell.

[0013] Furthermore, a clip 1 for clamping a circuit board is provided on the top of the insulating shell, and a mounting hole for the entire screw to pass through is opened on the circuit board. The clip 1 passes through the mounting hole and clamps with the circuit board to connect the single-tube fixed pressure block to the circuit board.

[0014] The beneficial effect of the present invention is that when in use, the bent end of the metal pressing plate contacts the radiator, and the end of the metal pressing plate located inside the insulating shell presses the single tube through the bottom of the insulating shell. The metal pressing plate is fixed in the middle and directly stressed at both ends, and the pressing effect is good. The metal pressing plate is separated from the circuit board and the single tube by the insulating shell to ensure the overall insulation. Since the side of the single-tube fixed pressing block that does not contact the unit as a whole is supported by the rigid contact of the bent end of the metal pressing plate with the radiator, the insulating shell is not in direct contact with the radiator, which can reduce the problem of its failure due to long-term stress creep in a high-temperature environment, and can more effectively ensure the stability and reliability of long-term compression.

[0015] The single-tube fixing block can also be used as a spacer when welding the single tube to the circuit board, ensuring the high consistency between the single tube and the circuit board, achieving height control during single-tube welding, and improving the efficiency of single-tube welding.

[0016] When applied to a single-tube fixed structure and adapted for use with two single tubes at the same time, since the two single tubes are compressed by a metal pressing plate at one end inside the insulating shell, screws do not need to pass through the ceramic substrate to connect to the radiator, and no opening design is required on the ceramic substrate. This can avoid it being under pressure in a high-temperature environment for a long time, and the risk of cracking at the opening on the upper edge of the ceramic substrate due to inconsistent thermal expansion coefficients of several materials in the heat dissipation link. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded schematic diagram of the single-tube fixed pressing block of the utility model.

[0018] Figure 2 This is a top view of the single-tube fixed pressing block of the utility model.

[0019] Figure 3 This is a bottom view of the single-tube fixed pressing block of the utility model.

[0020] Figure 4 This is an exploded schematic diagram of the single-tube fixing structure of the utility model.

[0021] Figure 5 It is a schematic diagram of the combination of the single-tube fixing structure of the utility model.

[0022] In the figure: 1. Insulating shell; 101. Opening; 11. Upper shell; 111. Through hole one; 112. Buckle one; 113. Buckle two; 114. Separator; 115. Notch; 116. Positioning piece; 12. Lower shell; 121. Through hole two; 122. Groove one; 123. Single tube arrangement area; 2. Metal pressing sheet; 21. Through hole three; 22. Groove two; 3. Screw; 4. Single tube; 5. Circuit board; 51. Mounting hole; 6. Radiator; 7. Ceramic substrate. DETAILED DESCRIPTION

[0023] like Figure 1-Figure 5As shown, the utility model provides a single-tube fixed pressure block, including an insulating shell 1 and a metal pressing plate 2. An opening 101 is provided on one side of the insulating shell 1, and a through hole 111 is provided on the top of the insulating shell 1 for the screw 3 to pass through as a whole, that is, the size of the through hole 111 is set to allow both the body and the head of the screw 3 to pass through, and a through hole 2 121 is provided on the bottom of the insulating shell 1 for the screw 3 to pass through, that is, the size of the through hole 2 121 is set to at least ensure that the body of the screw 3 can pass through. A through hole 3 21 is provided in the middle of the metal pressing plate 2 for the screw 3 to pass through, that is, the size of the through hole 3 21 is set to allow the body of the screw 3 to pass through, but the head of the screw 3 cannot pass through. One end of the metal pressing plate 2 is bent, as shown Figure 1 As shown, the left end of the metal pressing plate 2 is the bent end, and from this perspective, the bent end is facing downward. The metal pressing plate 2 is arranged inside the insulating shell 1, and the bent end of the metal pressing plate 2 extends to the outside of the insulating shell 1 along the opening 101, and the end of the metal pressing plate 2 and the bottom of the insulating shell 1 face the same direction, that is, the same direction. The end of the metal pressing plate 2 located inside the insulating shell 1 is used to press the single tube 4. Among them, the bottom of the insulating shell 1 refers to the side used to press the single tube 4, and the top is the other side. The bottom and top of the insulating shell 1 are only used for orientation description and do not limit the posture of the insulating shell 1 when in use.

[0024] The single-tube fixing pressing block provided by the present invention is used. When in use, the bottom of the insulating shell 1 is used to face the radiator 6. When fixed by the screw 3, the screw 3 passes through the through hole 111 as a whole, and its nail body passes through the through hole 2 121 and the through hole 3 21 and is connected to the radiator 6. The metal pressing plate 2 is pressed downward in the direction of the radiator 6 under the locking action of the screw 3. The bent end of the metal pressing plate 2 contacts the radiator 6. The end of the metal pressing plate 2 located inside the insulating shell presses the single tube 4 through the bottom of the insulating shell 1. The metal pressing plate 2 is in a The middle part is fixed and the two ends are directly stressed, and the pressing effect is good. After pressing and fixing, the metal pressing sheet 2 is separated from the circuit board 5 and the single tube 4 by the insulating shell 1. Compared with the single metal pressing sheet 2 structure, the insulation is better. Moreover, since the side of the pressing block that does not contact the unit as a whole is supported by the bent end of the metal pressing sheet 2 and rigidly contacting the radiator 6, the insulating shell 1 is not in direct contact with the radiator 6, which can reduce the problem of long-term creep and failure under high temperature environment, thereby more effectively ensuring the stability and reliability of long-term pressing.

[0025] In addition, since the metal pressing piece 2 is arranged in the insulating shell 1, the integrity of the single-tube fixed pressing block is better, which is convenient for overall installation when pressing the single tube 4, and the single-tube fixed pressing block as a whole can also be used as a pad when welding the single tube 4 to the circuit board 5. By setting the single-tube fixed pressing block on the circuit board 5, with the top of the insulating shell 1 facing the circuit board 5, and then placing the single tube 4 at the bottom of the insulating shell 1, the heat dissipation surface of the single tube 4 is pressed by the tooling, and finally the pins of the single tube 4 are welded to ensure the high consistency between the single tube 4 and the circuit board 5, realize the height control when welding the single tube 4, and improve the welding efficiency of the single tube 4.

[0026] Because the single tube 4 is compressed by the end of the metal pressing plate 2 located inside the insulating housing 1, it can be adapted to accommodate one or at least two single tubes 4 by setting the corresponding dimensions. The end of the metal pressing plate 2 located inside the insulating housing 1 can be tilted toward the bottom of the insulating housing 1 to ensure that this end of the metal pressing plate 2 exerts effective compression force on the single tube 4.

[0027] During use, the insulating housing 1 is connected to the circuit board 5 to control the relative position and height of the insulating housing 1 and the circuit board 5. In a preferred embodiment of the present invention, a snap 112 is provided on the top of the insulating housing 1. The snap 112 is located at the edge of the through hole 111 and extends away from the top of the insulating housing 1. During use, the snap 112 is used to engage with the circuit board 5 to connect the insulating housing 1 to the circuit board 5. This method is convenient, stable and reliable. In the preferred embodiment, there are at least two snaps 112 to ensure the stability of the engagement with the circuit board 5. In other embodiments, the insulating housing 1 can also be connected to the circuit board 5 using other methods.

[0028] The through hole 111 is located at one end of the top of the insulating shell 1, and the through hole 2 121 is located at one end of the bottom of the insulating shell 1, that is, the positions of the through hole 111 and the through hole 2 121 on the insulating shell 1 are located at one end of the insulating shell 1. The two sides of the end of the insulating shell 1 where the through hole 111 and the through hole 2 121 are located are tilted inward and contracted, thereby reducing the width of the end of the insulating shell 1 and reducing the occupied area when it is set on the circuit board 5. The two sides of the contracted area form avoidance areas, which provide more space for the layout of the circuit board 5 and reduce the difficulty of layout.

[0029] The insulating housing 1 is preferably made of plastic or other heat-resistant, non-deformable insulating material. The metal pressing plate 2 is made of heat-treated high-yield spring steel to ensure good strength and rigidity. In other embodiments, other high-yield metal materials may also be used if they meet design requirements.

[0030] The insulating housing 1 comprises an upper shell 11 and a lower shell 12. The top of the upper shell 11 serves as the top of the insulating housing 1, while the bottom of the lower shell 12 serves as the bottom of the insulating housing 1. The upper and lower shells 11 and 12 are secured together by a second snap fastener 113. A gap exists between one side of the lower shell 12 and one side of the upper shell 11, and the area of this gap forms the opening 101. This creates a split-piece structure that is held together by the second snap fastener 113. This arrangement facilitates processing and assembly of the metal pressing plate 2.

[0031] Both the upper and lower shells 11 and 12 include a front panel and side panels positioned on the sides of the front panel. The side panels of the upper shell 11 are taller than those of the lower shell 12. After the upper and lower shells 11 and 12 are secured together by snap fasteners 113, the ends of the side panels of the upper shell 11 protrude beyond the bottom of the lower shell 12. When the single-tube fixing block is used to clamp the single tube 4, the portion of the side panel of the upper shell 11 that protrudes beyond the bottom of the lower shell 12 forms a side stop on the side of the single tube 4, separating the single tube 4 from other components. When the single-tube fixing block is used to control the height of the single tube 4 during welding, the portion of the side panel of the upper shell 11 that protrudes beyond the bottom of the lower shell 12 forms a side stop on the side of the single tube 4, limiting the lateral position of the single tube 4. The side panel of the upper shell 11, facing away from the opening 101, is provided with a notch 115 for the pins of the single tube 4 to extend. This notch does not interfere with the pins' extension, enhancing versatility and compatibility with both three-pin and four-pin single tubes 4.

[0032] When the single-tube fixing block is adapted for use with at least two single tubes 4, a groove 122 is provided on the end of the lower shell 12 facing away from the second through-hole 121. The bottom of this end of the lower shell 12 is divided by the groove 122 into single-tube arrangement areas 123 equal to the number of adaptable single tubes 4. The number of single-tube arrangement areas 123 is the number of grooves 122 plus one. For example, when adapted for use with two single tubes 4, the number of grooves 122 is one, and the number of separated single-tube arrangement areas 123 is two. A divider 114 is provided on the side of the upper shell 11 facing the lower shell 12. The divider 114 extends along the groove 122 and protrudes from the bottom of the lower shell 12, separating the two single-tube arrangement areas 123, thereby isolating the single tubes 4 arranged in the two single-tube arrangement areas 123, and thus acting as a separator or lateral limiter. In order to take into account both the pressing reliability of the single-tube fixing block and the welding efficiency and assembly efficiency of the single tube 4 , it is preferred that the number of single tubes 4 that can be adapted is specifically two.

[0033] The metal pressing sheet 2 is provided with a second groove 22 at one end located inside the insulating shell 1 corresponding to the position of the first groove 122. The number of the second groove 22 is the same as the number of the first groove 122. The end of the metal pressing sheet 2 is divided into the same number of pressure areas as the single-tube arrangement areas 123 by the second groove 22, so that the end of the metal pressing sheet 2 located inside the insulating shell 1 can act on the range of each single-tube arrangement area 123 to apply a clamping force, thereby ensuring an effective and reliable clamping effect on the single tubes 4 in each single-tube arrangement area 123.

[0034] The second clip 113 is set on the side of the upper shell 11 facing the lower shell 12. The second clip 113 is passed through the first groove 122 and hooked on the bottom of the lower shell 12 to enable the upper shell 11 and the lower shell 12 to be engaged with each other, thereby ensuring the stability of the engagement between the upper shell 11 and the lower shell 12 and not easily loosened under the pressure of the metal pressing sheet 2.

[0035] The utility model also provides a single-tube fixing structure, including a single tube 4, a circuit board 5, a radiator 6 and a screw 3, and also includes the above-mentioned single-tube fixing block, the single-tube fixing block is located on the side of the circuit board 5 facing the single tube 4 and is connected to the circuit board 5, the bottom of the insulating shell 1 is set toward the single tube 4, the side of the single tube 4 used for heat dissipation faces the radiator 6 and contacts the ceramic substrate 7 arranged on the radiator 6, the screw 3 is passed through the second through hole 121 and the third through hole 21 along the through hole 111 and is connected to the radiator 6, and the end of the metal pressing plate 2 located inside the insulating shell 1 presses the single tube 4 through the bottom of the insulating shell 1.

[0036] The single-tube fixing structure is arranged as follows: first, the single tube 4 is welded to the circuit board 5. When welding the single tube 4, the single-tube fixing block is set on the circuit board 5, with the top of the insulating shell 1 facing the circuit board 5. Then the single tube 4 is placed on the bottom of the insulating shell 1, and the heat dissipation surface of the single tube 4 is pressed by the tooling. Finally, the pins of the single tube 4 are welded. The ceramic substrate 7 coated with thermal grease on both sides is placed in the groove of the heat sink 6, and then the circuit board 5 with the single tube fixing block set and the single tube 4 welded is placed as shown in the figure. Figure 5In the arrangement shown, the heat dissipation surface of the single tube 4 is arranged toward the radiator 6 and in contact with the ceramic substrate 7. Finally, a screw 3 is used to pass through the second through hole 121 and the third through hole 21 and connect to the radiator 6 for fixing. The metal pressing plate 2 is pressed downward toward the radiator 6 under the locking action of the screw 3. The bent end of the metal pressing plate 2 contacts the radiator 6. The end of the metal pressing plate 2 located inside the insulating shell presses the single tube 4 through the bottom of the insulating shell 1. In this single tube fixing structure, due to the provision of the above-mentioned single tube fixing pressure block, after pressing, the metal pressing plate 2 is fixed in the middle and directly stressed at both ends, resulting in a good pressing effect, more effectively ensuring the stability and reliability of long-term pressing, while taking into account the insulation. Moreover, the single tube fixing pressure block as a whole can also be used as a pad when welding the single tube 4 to the circuit board 5, ensuring the high consistency between the single tube 4 and the circuit board 5, achieving height control during welding of the single tube 4, and improving the welding efficiency of the single tube 4. When a single single-tube fixing block is adapted for use with two single tubes 4 at the same time, since the two single tubes 4 are compressed by the metal pressing plate 2 at one end inside the insulating shell 1, the screw 3 is located outside the two single tubes 4, rather than between the two single tubes 4. Therefore, the screw 3 does not need to pass through the ceramic substrate 7 to connect to the radiator 6, and no opening design is required on the ceramic substrate 7, which can avoid it being under pressure in a high-temperature environment for a long time, and the risk of cracking at the opening along the ceramic substrate 7 due to inconsistent thermal expansion coefficients of several materials in the heat dissipation link.

[0037] When the top of the insulating housing 1 is provided with a snap-on 112 for engaging the circuit board 5, the circuit board 5 is provided with a mounting hole 51 through which the screw 3 can pass as a whole. The snap-on 112 passes through the mounting hole 51 and hooks onto the edge of the mounting hole 51 of the circuit board 5, thereby engaging with the circuit board 5, thereby connecting the single-tube fixing block to the circuit board 5. Preferably, a positioning member 116 is also provided on the top of the insulating housing 1. The positioning member 116 is located at the edge of the through-hole 111. When the snap-on 112 is engaged with the circuit board 5, the positioning member 116 is inserted into the mounting hole 51 and serves as a lateral limiter. The positioning member 116 can be provided with a protrusion and a corresponding recess at the edge of the mounting hole 51 to prevent mistakes and improve assembly efficiency.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0039] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this application.

Claims

1. A single-tube fixed pressure block, characterized in that: The invention comprises an insulating shell (1) and a metal pressing plate (2), wherein an opening (101) is provided on one side of the insulating shell (1), a through hole (111) for the screw (3) to pass through as a whole is provided on the top of the insulating shell (1), and a through hole (121) for the screw (3) to pass through is provided on the bottom; a through hole (21) for the screw (3) to pass through is provided in the middle of the metal pressing plate (2), and one end of the metal pressing plate (2) is bent; the metal pressing plate (2) is arranged inside the insulating shell (1), and one end of the metal pressing plate (2) extends along the opening (101) to the outside of the insulating shell (1) and faces the same direction as the bottom of the insulating shell (1); the end of the metal pressing plate (2) located inside the insulating shell (1) is used to press the single tube (4).

2. The single-tube fixed pressure block according to claim 1, characterized in that: A buckle 1 (112) for engaging with a circuit board (5) is provided on the top of the insulating housing (1); the buckle 1 (112) is located at the edge of the through hole 1 (111) and extends in a direction away from the top of the insulating housing (1).

3. The single-tube fixed pressure block according to claim 1, characterized in that: The through hole 1 (111) is located at one end of the top of the insulating shell (1), and the through hole 2 (121) is located at one end of the bottom of the insulating shell (1). Both sides of the end of the insulating shell (1) where the through hole 1 (111) and the through hole 2 (121) are located are tilted inwards to form a contraction shape.

4. The single-tube fixing block according to any one of claims 1 to 3, characterized in that: The insulating shell (1) comprises an upper shell (11) and a lower shell (12), the top of the upper shell (11) being the top of the insulating shell (1), and the bottom of the lower shell (12) being the bottom of the insulating shell (1), the upper shell (11) and the lower shell (12) being fixed by a second snap fastener (113), and a gap is provided between one side of the lower shell (12) and one side of the upper shell (11), and the area where the gap is located forms the opening (101).

5. The single-tube fixing block according to claim 4, characterized in that: The upper shell (11) and the lower shell (12) both include a panel and a side panel arranged on the side of the panel. The height of the side panel of the upper shell (11) is greater than the height of the side panel of the lower shell (12). After the upper shell (11) and the lower shell (12) are fixed by a second snap fastener (113), the end of the side panel of the upper shell (11) protrudes from the bottom of the lower shell (12), and the side panel of the upper shell (11) facing away from the position where the outlet (101) is located is provided with a notch (115) for the pin of the single tube (4) to extend out.

6. The single-tube fixing block according to claim 5, characterized in that: A groove 1 (122) is provided at one end of the lower shell (12) facing away from the second through hole (121), and the bottom of the lower shell (12) is divided into a corresponding number of single-tube arrangement areas (123) by the groove 1 (122). A partition (114) is provided on a side of the upper shell (11) facing the lower shell (12), and the partition (114) extends along the groove 1 (122) and protrudes from the bottom of the lower shell (12).

7. The single-tube fixing block according to claim 6, characterized in that: A second groove (22) is provided at one end of the metal pressing plate (2) located inside the insulating housing (1) at a position corresponding to the position of the first groove (122). The second groove (22) divides the end of the metal pressing plate (2) into the same number of pressure application areas as the single-tube arrangement area (123).

8. The single-tube fixing block according to any one of claims 5 to 7, characterized in that: The second buckle (113) is arranged on a side of the upper shell (11) facing the lower shell (12), and the second buckle (113) is passed through the first groove (122) and hooked on the bottom of the lower shell (12).

9. A single-tube fixing structure, characterized in that: The invention comprises a single tube (4), a circuit board (5), a heat sink (6), a ceramic substrate (7) and a screw (3), and further comprises a single tube fixing block as described in any one of claims 1 to 8, wherein the single tube fixing block is located on a side of the circuit board (5) facing the single tube (4) and is connected to the circuit board (5), the bottom of the insulating shell (1) is arranged toward the single tube (4), the side of the single tube (4) used for heat dissipation faces the heat sink (6) and contacts the ceramic substrate (7) arranged on the heat sink (6), the screw (3) is passed through the second through hole (121) and the third through hole (21) along the first through hole (111) and is connected to the heat sink (6), and the end of the metal pressing piece (2) located inside the insulating shell (1) presses the single tube (4) through the bottom of the insulating shell (1).

10. The single-tube fixing structure according to claim 9, wherein: When a buckle 1 (112) for clamping the circuit board (5) is provided on the top of the insulating housing (1), a mounting hole (51) for the screw (3) to pass through as a whole is provided on the circuit board (5), and the buckle 1 (112) passes through the mounting hole (51) and is clamped to the circuit board (5), so that the single-tube fixed pressure block is connected to the circuit board (5).

Images