Fixing unit and heat dissipation device applying the same

Abstract

The present invention relates to a fixing unit and a heat dissipation device using the fixing unit. The four corners of the heat dissipation device are assembled with a heat source by arranging a plurality of fixing units; the fixing unit has a spring screw, a screw sleeve, and a snap ring. The end of the spring screw is provided with a buckle ring to prevent the spring from falling off, and the spring screw is sleeved in the screw sleeve; the screw sleeve has two cutouts, and the snap ring is sleeved on the screw sleeve. One side of the snap ring extends upward to form a pair of clasping pieces, and the pair of clasping pieces extend into the cutouts to clasp the top end of the spring, so that the spring is in a compressed state within the sleeve; when it is desired to make the heat dissipation device closely fit the heat source for heat exchange, only by removing the clasping of the pair of clasping pieces on the spring by an external force or an external object, the spring can be released to provide the heat dissipation device with a uniform and synchronous downward pressing contact force on the heat source.

Description

Technical Field

[0001] The present invention relates to a fixing unit and a heat dissipation device using the fixing unit, and more particularly to a fixing unit that can provide synchronous and uniform downward pressure to avoid damage or thermal resistance caused by asynchronous and uneven contact force between the bare die and the heat dissipation device. Background Technology

[0002] To provide high-performance computing capabilities for electronic devices, high-efficiency, high-power chips are currently used. These chips generate considerable heat during computation. Traditionally, computing chips are encapsulated in a casing to protect them from damage. However, as computing performance increases, the temperature generated during operation becomes even higher. Furthermore, the external casing significantly hinders heat dissipation and outward heat conduction efficiency. Therefore, most chips on the market are now available in a bare die form. However, because the surface of this bare die is not flat but convex and rounded, and the lack of a protective casing results in a small heat exchange contact area and low strength, it is prone to damage and cracking when combined with heat dissipation devices.

[0003] In addition, when traditional heat dissipation devices are fixed above the heat source (bare die), they are locked sequentially at a single locking point. This causes the locking points to be asynchronous, which can easily lead to contact tilting. The bare die cannot withstand such uneven pressure, which can easily cause problems such as chip breakage and damage.

[0004] See Figure 6 , Figure 7 This is a schematic diagram of an existing heat dissipation device and bare die assembly. The heat source A (bare die type) is mounted on a substrate D. Corresponding to the four corners of the outer side of the heat source A, copper pillars B with internal threads are located on the substrate D. The heat dissipation device C also has four holes C3 corresponding to the copper pillars B, through which screw units C1 are inserted. A spring C2 is fitted around each screw unit C1. When the heat dissipation device C is locked to the heat source A, it is usually done manually or by a robotic arm using an electric screwdriver, performing single-point sequential screw-locking operations. To speed up assembly time on the production line and within limited time... Assembly is completed within the time limit. Usually, each fixing screw is fastened into place quickly and directly in one go. When screw unit C1 is tightened to the fixed point one by one, the spring C2 sleeved on the screw unit C1 also supports it in the direction of heat source A. As a result, the uneven force caused by single-point tightening immediately causes the heat source to be hit. As mentioned above, heat source A (bare crystal) is brittle. However, the single-point tightening of screw unit C1 and the pressure of spring C2 cannot provide heat source A (bare crystal) with complete and comprehensive (four corners of the bare crystal) synchronous and uniform downward pressure. The bare crystal is easily damaged due to uneven force.

[0005] Furthermore, bare crystals are quite fragile. As mentioned above, the four corners of the bare crystal must be simultaneously and synchronously subjected to uniform downward pressure to provide bonding force for assembly. If it is not possible to simultaneously apply downward pressure to the four corners of the bare crystal in an even manner, it is easy for the heat sink or heat dissipation device to warp and not fit completely or cause damage between the heat source (bare crystal). It is also easy to form thermal resistance, which will cause uneven heating or failure of heat conduction.

[0006] Therefore, how to improve the heat dissipation device to provide uniform pressure and close contact with the heat source, and how to maintain proper bonding force between the bare die and the heat dissipation device, as well as the ability to be repeatedly installed or adjusted, are the primary problems that manufacturers need to solve at present. Summary of the Invention

[0007] Therefore, in order to effectively solve the above problems, the main objective of the present invention is to provide a fixing unit that can simultaneously and synchronously provide average downward pressure and a heat dissipation device using the fixing unit, so as to effectively avoid the occurrence of corner cracking or breakage of the bare die computing unit due to the prior locking of a single locking point.

[0008] To achieve the above objectives, the present invention provides a fixing unit, characterized in that it comprises:

[0009] A spring screw has at least one slot near its lower end, which holds a retaining ring. A spring passes through the spring screw, and one end of the spring abuts against the retaining ring.

[0010] A screw sleeve has an open first end and a second end, and a receiving space is connected between the first end and the second end. The first end of the screw sleeve has two slits spaced apart, and a step is provided on both sides of the opening of the slit. The spring screw is provided in the receiving space of the screw sleeve.

[0011] A retaining spring has an inner hole and is fitted onto the outside of a screw sleeve through the inner hole. A pair of retaining tabs extend upward from one side of the retaining spring. The pair of retaining tabs form a bend towards the inner hole and extend to an end. The bend rests against the step. A hole is opened on each of the pair of retaining tabs, and the ends of the pair of retaining tabs extend into the receiving space of the sleeve through a cut in the sleeve to lock one end of the spring.

[0012] The fixing unit, wherein: the outer edge of the screw sleeve has a sleeve portion below the cut, the sleeve portion is used to fit the snap ring, and the sleeve portion forms an annular groove or an annular rib.

[0013] The fixing unit, wherein: the pair of fasteners of the snap ring have a fixed end and a free end, the fixed end is connected to the snap ring, the free end is formed at the end of the fastener, and the fixed end of the pair of fasteners is connected to the left and right sides of the snap ring, each having a small groove.

[0014] The fixing unit, wherein: the first end of the screw sleeve is provided with two notches, the two notches and the two cuts are arranged alternately at intervals, the first end of the screw sleeve corresponding to the two notches extends radially towards the screw sleeve, the pair of arc-shaped flanges are arranged at 180 degrees apart, the notch penetrates the inner and outer tube walls of the screw sleeve and extends upward to the arc-shaped flange to form an axial guide track, the notch has a first position and a second position corresponding to the axial direction of the screw sleeve.

[0015] The fixing unit further includes a release member having a body having an outer wall and an inner wall. The body has two outwardly expanding support portions, which can pass through the holes of the aforementioned fastener. Each of the two outwardly expanding support portions has an extension section, which are arranged at 180-degree intervals. The two extension sections are formed by extending axially along the edge of the body from the outer wall. The end of each extension section extends inclinedly towards the center of the body.

[0016] The fixing unit, wherein: the release member further has two axial guide portions, which are staggered with the two outward expansion support portions. Each of the two axial guide portions has a vertical segment, which are arranged at 180-degree intervals. The two vertical segments are formed by extending axially along the lower part of the body from the edge of the inner wall surface, and a limiting segment extends outward from the end of the two vertical segments.

[0017] A heat dissipation device with a fixed unit, characterized in that it comprises:

[0018] A heat dissipation device body has a first side, a second side, and a heated area. The four corners of the outer side of the heated area have a plurality of through holes that penetrate the first side and the second side.

[0019] A plurality of fixing units are correspondingly disposed at the through-holes of the heat dissipation device body, and the plurality of fixing units includes:

[0020] A spring screw has at least one slot near its lower end, a retaining ring is engaged in the slot, a spring is inserted through the spring screw, and one end of the spring and one side of the retaining ring are respectively attached to the first side and the second side of the heat dissipation device body.

[0021] A screw sleeve has an open first end and a second end, and a receiving space is connected between the first end and the second end. The first end of the screw sleeve has two slits spaced apart, and a step is provided on both sides of the opening of the slit. The spring screw is provided in the receiving space of the screw sleeve.

[0022] A retaining spring has an inner hole and is fitted onto the outside of a screw sleeve through the inner hole. A pair of retaining tabs extend upward from one side of the retaining spring. The pair of retaining tabs form a bend towards the inner hole and extend to an end. The bend rests on the step. A hole is opened on each of the pair of retaining tabs, and the ends of the pair of retaining tabs extend into the receiving space of the sleeve through the cut of the sleeve to lock one end of the spring for axial limiting.

[0023] The heat dissipation device with a fixed unit, wherein: the outer edge of the screw sleeve has a sleeve portion below the cut, the sleeve portion is used to fit the snap ring, and the sleeve portion forms an annular groove or an annular rib.

[0024] The heat dissipation device with a fixed unit, wherein: the pair of fasteners of the snap ring have a fixed end and a free end, the fixed end is connected to the snap ring, the free end is formed at the end of the fastener, and the fixed end of the pair of fasteners is connected to the left and right sides of the snap ring, each having a small groove.

[0025] The heat dissipation device with a fixed unit, wherein: the first end of the screw sleeve is provided with two notches, the two notches and the two cuts are arranged alternately at intervals, the first end of the screw sleeve corresponding to the two notches extends radially toward the screw sleeve with a pair of arc-shaped flanges, the pair of arc-shaped flanges are arranged at 180 degrees apart, the notch penetrates the inner and outer tube walls of the screw sleeve and extends upward to the arc-shaped flange to form an axial guide track, the notch has a first position and a second position corresponding to the axial direction of the screw sleeve.

[0026] The heat dissipation device with a fixed unit further includes a release member having a body having an outer wall and an inner wall. The body has two outwardly expanding support portions, which can pass through the holes of the aforementioned fastener. Each of the two outwardly expanding support portions has an extension section, and the two extension sections are arranged at 180-degree intervals. The two extension sections are formed by extending axially along the edge of the body from the outer wall. The end of the extension section then extends inclinedly towards the center of the body.

[0027] The heat dissipation device with a fixed unit, wherein: the release member further has two axial guide portions, which are staggered with the two outward expansion support portions. Each of the two axial guide portions has a vertical segment, which are arranged at 180-degree intervals. The two vertical segments are formed by extending axially along the lower part of the body from the edge of the inner wall surface, and a limiting segment extends outward from the end of the two vertical segments.

[0028] The heat dissipation device with a fixed unit, wherein the screw sleeve is integrally formed by extending from the first side of the heat dissipation device body.

[0029] The advantages of this invention are as follows: First, after aligning the heated area of ​​the heat dissipation device body with the heat source, the spring screw of the fixing unit with the external thread is pre-locked and positioned with the substrate containing the heat source. At this time, the springs are still in a compressed state inside the screw sleeve. After the fixing units at all four corners are pre-locked, the release member can be operated to open the pair of clips of the retaining spring outward toward the outside of the screw sleeve by expanding the top support. This allows the pair of clips to simultaneously release the top of the spring, thereby allowing the springs to provide synchronous and uniform downward pressure on the four corners of the heat dissipation device body. This ensures that the heat dissipation device body and the heat source (bare die) can make stable and tight contact, avoiding uneven force that could cause corner breakage or cracking, or thermal resistance due to incomplete fit. It also avoids excessive pressure during the screwing process that could cause the heat source (bare die) to crack and be damaged. Attached Figure Description

[0030] Figure 1 This is an exploded perspective view of the fixed unit of the present invention;

[0031] Figure 2 This is a cross-sectional view of the fixed unit assembly of the present invention;

[0032] Figure 3 This is a cross-sectional view of the fixed unit assembly of the present invention;

[0033] Figure 4 This is a schematic diagram of the fixing unit of the present invention;

[0034] Figure 5 This is a schematic diagram of the assembly operation of the heat dissipation device of the present invention;

[0035] Figure 6 This is a schematic diagram of an existing heat dissipation device combined with a bare die;

[0036] Figure 7 This is a schematic diagram of the existing heat dissipation device combined with the bare die.

[0037] Reference numerals in the attached drawings: Fixing unit 1; Spring screw 11; Upper end 11A; Lower end 11B; Nut 112; External thread 113; Slot 114; Spring 12; Top end 121; Bottom end 122; Screw sleeve 13; First end 13A; Second end 13B; Accommodating space 13C; Notch 131; Cutout 132; Socket 133; Stepped part 134; Arc-shaped flange 135; Snap ring 14; Inner hole 141; Clip 142; Bending part 142A; Fixed end 1421; Free end 1422; Clip 143; Bending part 143A; Fixed end 1431; Free end 142 ... Components include: end 1432; hole 144; hole 145; small groove 146; release element 15; outer wall surface 15A; inner wall surface 15B; body 151; axial guide part 152; vertical section 1521; limiting section 1522; hook end 1521; outward expansion top support part 153; extension section 1531; inclined section 1532; buckle 16; heat dissipation device body 2; first side 21; second side 22; heated area 23; perforation 24; heat source 3; fixing structure 4; equipment 5; jig 6; top support column 61; first position A; second position B; distance E; outer diameter F; spacing G. Detailed Implementation

[0038] The above-mentioned objectives of the present invention and its structural and functional characteristics will be described with reference to the preferred embodiments shown in the accompanying drawings.

[0039] Please see Figure 1 , Figure 2 , Figure 3 The figures show a three-dimensional assembly and exploded view of the fixing unit of the present invention. As shown in the figure, the fixing unit 1 of the heat dissipation device of the present invention includes: a spring screw 11, a screw sleeve 13, a snap ring 14, and a release member 15.

[0040] The spring screw 11 has an upper end 11A and a lower end 11B, and the upper and lower ends 11A and 11B respectively have a nut 112 and a plurality of external threads 113. The spring screw 11 has at least one groove 114 above the external threads 113. The groove 114 is annularly radially recessed outside the spring screw 11. A retaining ring 16 is installed in the groove 114. A spring 12 is sleeved between the groove 114 and the nut 112 of the spring screw 111. The spring 12 has a top end 121 and a bottom end 122. The bottom end 122 abuts against the upward-facing surface of the retaining ring 16. The retaining ring 16 provides axial restraint for the spring 12 to prevent the spring 12 from falling off from the lower end 11B of the spring screw 11. The retaining ring 16 is a C-type retaining ring, an E-type retaining ring, or other types of retaining rings. This embodiment uses an E-type retaining ring as an illustrative embodiment but is not intended to limit it.

[0041] The screw sleeve 13 has an open first end 13A and a second end 13B at its upper and lower ends, respectively, and a receiving space 13C is connected between the first and second ends 13A and 13B. The first end 13A of the screw sleeve 13 has two notches 131 and two cuts 132 arranged in a ring at intervals. The two notches 131 and the two cuts 132 are arranged alternately at intervals (forming a cross shape between them). There is a sleeve portion 133 at the lower part of the outer edge of the first end 13A of the screw sleeve 13, near the bottom of the cut 132. The sleeve portion 133 can form an annular groove or an annular rib, etc., thereby providing axial positioning of the retaining spring 14 and preventing the retaining spring 14 from axially falling off or displacing relative to the screw sleeve 13. The spring screw 11 is sleeved in the receiving space 13C of the screw sleeve 13.

[0042] The retaining ring 14 is a ring with an inner hole 141, and is sleeved on the sleeve portion 133 of the screw sleeve 13 through the inner hole 141. The inner hole 141 of the retaining ring 14 and the screw sleeve 13 can be combined in a loose fit or a tight fit manner. In this embodiment, a tight fit is used as an example, but it is not intended to be a limitation. The snap ring 14 extends upward from the edge of the ring body with a pair of elastic fasteners 142 and 143, which are arranged corresponding to each other at a 180-degree interval. The pair of fasteners 142 and 143 can also be configured as three, four or more pieces arranged in a corresponding ring shape. The pair of fasteners 142 and 143 each have a fixed end 1421 and 1431 and a free end 1422 and 1432. The fixed ends 1421 and 1431 are fixed or integrally connected to the edge of the snap ring 14. The pair of fasteners 142 and 143 form bent portions 142A and 143A along the center direction of the inner hole 141 and extend to an end. The free ends 1422 and 1432 are formed at the ends of the pair of fasteners 142 and 143.

[0043] The first end 13A of the screw sleeve 13 is connected to the two upper openings of the two cutouts 132 and has a step 134 on both sides. The pair of fasteners 142 and 143 are bent into the screw sleeve 13 and bridging the step 134. The step 134 is used to provide abutment and support.

[0044] The pair of fasteners 142 and 143 each have a hole 144 and a hole 145 formed between the fixed ends 1421 and 1431 and the free ends 1422 and 1432, and are relatively close to the free ends 1422 and 1432. The free ends 1422 and 1432 of the pair of fasteners 142 and 143 extend into the receiving space 13C of the screw sleeve 13 through the cut 132 of the screw sleeve 13, and precisely engage the top end 121 of the spring 12. This restricts the spring 12 from releasing its elastic force axially upward, meaning that the top 121 of the spring 12 is temporarily compressed and cannot be supported at the lower end of the nut 112 of the spring screw 11. In addition, the fixed ends 1421 and 1431 of the pair of clips 142 and 143 have a small groove 146 on the left and right sides of the ring body connecting the snap ring 14. The small groove 146 provides the pair of clips 142 and 143 with a larger bending angle and resistance to tearing and breakage.

[0045] The release member 15 has a body 151, the upper and lower ends of which are interconnected. The body 15 has an outer wall surface 15A and an inner wall surface 15B. The lower end of the body 151 is provided with two axial guide parts 152 and two outward expansion support parts 153 arranged at intervals. The two axial guide parts 152 and the two outward expansion support parts 153 are arranged in an alternating interval.

[0046] The outward expansion support 153 has an extension section 1531. The extension sections 1531 of the two outward expansion support sections 153 are arranged at 180-degree intervals. The two extension sections 1531 are formed by extending axially along the edge of the outer wall surface 15A of the body 151. At the end of the extension section 1531, an inclined section 1532 extends inclinedly towards the center of the body 151. There is a distance E between the two extension sections 1531 of the two outward expansion support sections. The distance E is greater than or equal to the outer diameter F of the screw sleeve 13.

[0047] The two axial guide portions 152 have two vertical segments 1521, which are arranged at 180-degree intervals. The two vertical segments 1521 are formed by extending axially below the edge of the inner wall surface 15B of the body 151, and a limiting segment 1522 extends outward from the end of the two vertical segments 1521. There is a gap G between the two vertical segments 1521, which is less than or equal to the outer diameter F of the screw sleeve 13.

[0048] At the first end 13A of the screw sleeve 13, corresponding to the two notches 131, a pair of arc-shaped flanges 135 extend radially into the screw sleeve 13. The pair of arc-shaped flanges 135 are arranged at 180-degree intervals. The notches 131 penetrate the inner and outer tube walls of the screw sleeve 13 and extend upward to the arc-shaped flanges 135 to form an axial guide track.

[0049] The notch 131 has a first position A and a second position B corresponding to the axial direction of the screw sleeve 13. The first position A is located at the lower side of the notch 131 where it connects to the arc-shaped flange 135, and the second position B is located at the lower end of the notch 131 where it connects to the screw sleeve 13. The first and second positions A and B are the beginning and end positions of the axial guide rail. The axial guide part 152 is axially slidable with the notch 131. The limiting section 1522 of the axial guide part 152 is limited by the arc-shaped flange 135, which limits the axial displacement, so that the release part 15 can only move between the first and second positions A and B of the notch 131, preventing the release part 15 from falling off, and also preventing the release part 15 and the screw sleeve 13 from rotating or shifting.

[0050] When the release member 15 moves axially toward and approaches the retaining spring member 14, the outwardly expanding support portion 153 extends into the holes 145 and 144 of the pair of fasteners 142 and 143, pushing the pair of fasteners 142 and 143 outward, causing the pair of fasteners 142 and 143 to open outward and extend outward. This, in turn, causes the free ends 1422 and 1432 of the pair of fasteners 142 and 143 to move outward and extend outward in the radial direction of the screw sleeve 13, so that the free ends 1422 and 1432 of the pair of fasteners 142 and 143 are released from holding the top end 121 of the spring 12, and the spring 12 is released from the compressed state.

[0051] Please see Figure 3 , Figure 4 , Figure 5 The figures are three-dimensional exploded and assembled action diagrams of the heat dissipation device of the present invention. As shown in the figures, the heat dissipation device of the present invention includes: a heat dissipation device body 2 and a plurality of fixing units 1.

[0052] The heat dissipation device body 2 has a first side 21, a second side 22, and a heated area 23. The heated area 23 has a plurality of through holes 24 at its four corners, which penetrate the first and second sides 21 and 22 of the heat dissipation device body 2. The heat dissipation device body 2 can be a heat spreader, a heat sink, or a heat conductor, and is not limited thereto. The structure of the fixing unit 1 in this embodiment is as described in the foregoing description and figures, and will not be repeated here.

[0053] The multiple fixing unit 1 is first inserted through the through hole 24 of the heat sink body 2 by one end of the spring screw 111 with multiple external threads 113, and then the retaining ring 16 is locked in the slot 114 of the spring screw 111. The upward-facing surface of the retaining ring 16 is attached to the second side 22 of the heat sink body 2, so that the spring screw 11 cannot be pulled upward from the through hole 24. The screw sleeve 13 is sleeved on the spring screw 11, and the second end 13B of the lower end of the screw sleeve 13 and the bottom end 122 of the spring 12 abut against the surface of the first side 21 of the heat sink body 2. The screw sleeve 13 can also be formed by directly extending the first side 21 of the heat sink body 2. The other components are then combined with the screw sleeve 13 in sequence by insertion or sleeve.

[0054] The retaining spring 14 is sleeved onto the sleeve portion 133 of the screw sleeve 13, and the top end 121 of the spring 12 is held by the free ends of the retaining spring 14's clips 142 and 143, causing the spring 12 to be temporarily compressed within the screw sleeve 13. At this time, the plurality of fixing units 1 are fixed to the four corners of the heated area 23 of the heat dissipation device body 2. Before the heat dissipation device body 2 is assembled with the heat source, it can be ensured that the fixing unit 1 will not fall off the heat dissipation device body 2 during the movement of the heat dissipation device body 2, and at the same time, it can increase the assembly speed and efficiency on the production line.

[0055] When the bare crystal heat source 3 is to be assembled with the heat dissipation device and the heat dissipation device provides heat exchange, the spring screws 11 located at the four corners of the outer side of the heat-receiving area 23 of the heat dissipation device body 2 are first pre-locked and fixed to the fixing structure 4 (stud with internal threads) on the substrate on which the heat source 3 is mounted by means of the external threads 113. At this time, the spring 12 sleeved inside the sleeve and connected to the outside of the spring screw 11 has not yet released its elastic force. Therefore, the heat dissipation device body 2 is only placed and positioned above the heat source 3 and does not provide any downward pressure to the heat source 3. That is, the surface of the heat-receiving area 23 (second side 22) of the heat dissipation device body 2 only lightly touches and slightly touches the surface of the heat source 3.

[0056] The fixed unit 1 provided by the present invention can be installed by mechanical equipment to assist in the automatic application of external force or by on-site personnel to operate hand tools. In this embodiment, mechanical equipment is used to assist in the application of external force for installation, but this is not a limitation and external force can also be provided to assist installation in other ways.

[0057] In this embodiment, a pre-set device 5 provides downward pressure. This device 5 can provide downward pressure directly or be used in conjunction with a fixture (not shown in the figure). The device 5 then applies external force to the release member 15. The device 5 has four support parts 51, which respectively correspond to the fixing units 1 at the four outer corners of the heated area 23 of the heat dissipation device body 2. These support parts 51 simultaneously abut against the upper ends of the release members 15. When the device 5 moves downward, the support parts 51 simultaneously apply pressure to the release members 15, forcing the release members 15 downward towards the retaining spring members 14, and the release members 15 expand outwards to support the release members. Part 153 is pressed down and inserted into the holes of the fasteners 142 and 143, forcing the fasteners 142 and 143 to move radially outward toward the screw sleeve 13 and unfold outward, so that the free ends 1422 and 1432 of the pair of fasteners 142 and 143 can be released from the top end 121 of the spring 12, allowing the spring 12 to fully release its restricted elastic force. The top end 121 of the spring 12 then supports the lower end of the nut 112. At the same time, the bottom end 122 of the spring 12 provided on the four corner fixing units 1 provides synchronous and uniform downward pressure to the four corners of the heat dissipation device body 2.

[0058] In this invention, the spring screw 11 only pre-locks the heat sink body 2 above the heat source 3 without applying any pressure. The actual force that provides the heat sink body 2 with downward support to the heat source 3 is provided by the springs 12 located outside the spring screw 11 at the four corners. By simultaneously releasing the tension of the springs 12 in the four fixing units 1 on the heat sink body 2, the springs 12 can provide synchronous and uniform downward pressure to the four corners of the heat sink body 2, so that the heat sink body 2 and the heat source (bare die) can make stable and tight contact. This avoids uneven force causing corner breakage or cracking, or thermal resistance due to incomplete fit. It also avoids excessive pressure during the screw-locking process causing the heat source (bare die) to crack and be damaged. This solves the problems of uneven force caused by locking one locking point at a time, or uneven force caused by excessive spring support causing warping or direct cracking of the chip.

Claims

1. A fixed unit, characterized in that, Include: A spring screw has at least one slot near its lower end, which holds a retaining ring. A spring passes through the spring screw, and one end of the spring abuts against the retaining ring. A screw sleeve has an open first end and a second end, and a receiving space is connected between the first end and the second end. The first end of the screw sleeve has two slits spaced apart, and a step is provided on both sides of the opening of the slit. The spring screw is provided in the receiving space of the screw sleeve. A retaining spring has an inner hole and is fitted onto the outside of the screw sleeve through the inner hole. A pair of retaining tabs extend upward from one side of the retaining spring. The pair of retaining tabs form a bend towards the inner hole and then extend to an end. The bend rests against the step. A hole is opened on each of the pair of retaining tabs, and the ends of the pair of retaining tabs extend into the receiving space of the sleeve through the cut of the sleeve to lock one end of the spring. A release member has a body with an outer wall and an inner wall. The body has two outwardly expanding support portions that can pass through the holes of the aforementioned fastener. Each of the two outwardly expanding support portions has an extension section. The two extension sections are arranged at 180-degree intervals. The two extension sections are formed by extending axially along the edge of the body from the outer wall. The end of the extension section then extends inclinedly towards the center of the body.

2. The fixing unit as described in claim 1, characterized in that: The outer edge of the screw sleeve has a sleeve portion below the cut, which is used to fit the snap ring. The sleeve portion has an annular groove or an annular rib.

3. The fixing unit as described in claim 1, characterized in that: The pair of snap fasteners of the snap fastener have a fixed end and a free end. The fixed end is connected to the snap fastener, and the free end is formed at the end of the snap fastener. The fixed end of the pair of snap fasteners is connected to the left and right sides of the snap fastener, each having a small groove.

4. The fixing unit as described in claim 1, characterized in that: The first end of the screw sleeve has two notches, which are staggered with the two cuts. Corresponding to the two notches, a pair of arc-shaped flanges extend radially from the first end of the screw sleeve. The pair of arc-shaped flanges are spaced 180 degrees apart. The notches penetrate the inner and outer tube walls of the screw sleeve and extend upward to the arc-shaped flanges to form an axial guide track. The notches have a first position and a second position corresponding to the axial direction of the screw sleeve.

5. The fixing unit as described in claim 1, characterized in that: The release member also has two axial guide portions, which are staggered with the two outward expansion support portions. Each of the two axial guide portions has a vertical segment, which are spaced 180 degrees apart. The two vertical segments are formed by extending axially along the lower part of the body from the edge of the inner wall surface, and a limiting segment extends outward from the end of the two vertical segments.

6. A heat dissipation device having a fixed unit, characterized in that, Include: A heat dissipation device body has a first side, a second side, and a heated area. The four corners of the outer side of the heated area have a plurality of through holes that penetrate the first side and the second side. A plurality of fixing units are correspondingly disposed at the through-holes of the heat dissipation device body, and the plurality of fixing units includes: A spring screw has at least one slot near its lower end, a retaining ring is engaged in the slot, a spring is inserted through the spring screw, and one end of the spring and one side of the retaining ring are respectively attached to the first side and the second side of the heat dissipation device body. A screw sleeve has an open first end and a second end, and a receiving space is connected between the first end and the second end. The first end of the screw sleeve has two slits spaced apart, and a step is provided on both sides of the opening of the slit. The spring screw is provided in the receiving space of the screw sleeve. A retaining spring has an inner hole and is fitted onto the outside of a screw sleeve through the inner hole. A pair of retaining tabs extend upward from one side of the retaining spring. The pair of retaining tabs form a bend towards the inner hole and then extend to an end. The bend is mounted on the step. A hole is opened on each of the pair of retaining tabs, and the ends of the pair of retaining tabs extend into the receiving space of the sleeve through the cut of the sleeve to lock one end of the spring for axial limiting. A release member has a body with an outer wall and an inner wall. The body has two outwardly expanding support portions that can pass through the holes of the aforementioned fastener. Each of the two outwardly expanding support portions has an extension section, and the two extension sections are arranged at 180-degree intervals. The two extension sections are formed by extending axially along the edge of the body from the outer wall. The end of the extension section then extends inclinedly towards the center of the body.

7. The heat dissipation device with a fixed unit as described in claim 6, characterized in that: The outer edge of the screw sleeve has a sleeve portion below the cut, which is used to fit the snap ring. The sleeve portion has an annular groove or an annular rib.

8. The heat dissipation device with a fixed unit as described in claim 6, characterized in that: The pair of fasteners of the snap ring have a fixed end and a free end. The fixed end is connected to the snap ring, and the free end is formed at the end of the fastener. The fixed end of the pair of fasteners is connected to the left and right sides of the snap ring, each having a small groove.

9. The heat dissipation device with a fixed unit as described in claim 6, characterized in that: The first end of the screw sleeve has two notches, which are staggered with the two cuts. A pair of arc-shaped flanges extend radially from the first end of the screw sleeve corresponding to the two notches. The pair of arc-shaped flanges are spaced 180 degrees apart. The notch penetrates the inner and outer tube walls of the screw sleeve and extends upward to the arc-shaped flange to form an axial guide track. The notch has a first position and a second position corresponding to the axial direction of the screw sleeve.

10. The heat dissipation device with a fixed unit as described in claim 9, characterized in that: The release member also has two axial guide portions, which are staggered with the two outward expansion support portions. Each of the two axial guide portions has a vertical segment, which are spaced 180 degrees apart. The two vertical segments are formed by extending axially along the lower part of the body from the edge of the inner wall surface, and a limiting segment extends outward from the end of the two vertical segments.

11. The heat dissipation device with a fixed unit as described in claim 6, characterized in that: The screw sleeve is integrally extended from the first side of the heat dissipation device body.

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