Combined gland

Abstract

The utility model discloses a combined gland which comprises a gland body and an elastic piece. A cavity is formed in the cover body, the cover body is made of glass fiber reinforced nylon and comprises an upper cover and a lower cover connected with the upper cover, and the lower cover can repeatedly move between a first position and a second position in the set direction relative to the upper cover. When in the first position, a first distance is formed between the upper surface of the lower cover and the lower surface of the upper cover; when in the second position, a second distance is formed between the upper surface of the lower cover and the lower surface of the upper cover; the second distance is greater than the first distance. The outer surface of the elastic piece is coated with resin, and the elastic piece is arranged in the cavity and used for applying reset force to the lower cover, so that the lower cover is kept at the second position or the lower cover has the trend of moving from the first position to the second position all the time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a combined gland. BACKGROUND

[0002] As the known embodiment provided by CN210778549U knows, the main defect existing in the existing MOS tube or IGBT chip pressing block is that the pressing block is a pure plastic product, which is easy to deform under heat, thereby causing the pressing block to fail. SUMMARY

[0003] Therefore, the utility model provides a combined gland to solve the above problems.

[0004] In order to achieve the above purpose, the utility model provides the following technical scheme.

[0005] A combined gland comprises a cover body and an elastic piece. The cover body has a cavity inside, is made of glass fiber reinforced nylon, comprises an upper cover and a lower cover connected together, and the lower cover can move back and forth between a first position and a second position relative to the upper cover along a certain direction. When at the first position, the upper surface of the lower cover is apart from the lower surface of the upper cover by a first distance. When at the second position, the upper surface of the lower cover is apart from the lower surface of the upper cover by a second distance, which is greater than the first distance. The outer surface of the elastic piece is covered with resin and is arranged in the cavity, and is used for applying a reset force to the lower cover, so that the lower cover is maintained at the second position or always has a tendency to move from the first position to the second position.

[0006] Preferably, the elastic piece is a spring piece structure with an upwardly raised middle region, and is in the shape of a rectangular sheet. The upper surface of the lower cover is formed with a receiving groove matched with the spring piece structure, and the receiving groove and the lower surface of the upper cover jointly define the cavity.

[0007] Preferably, the receiving groove is formed by four long strip-shaped protrusions formed on the upper surface of the lower cover and connected end to end, and the four long strip-shaped protrusions comprise short edge protrusions at both ends in the length direction and long edge protrusions at both ends in the width direction. The two ends of the spring piece structure in the length direction are limited between the two short edge protrusions, and the two ends of the spring piece structure in the width direction are limited between the two long edge protrusions.

[0008] Preferably, the four long strip-shaped protrusions have the same height and are equal to the first distance, so as to limit the limit position of the lower cover moving towards the upper cover to be the first position.

[0009] Preferably, when the lower cover is at the first position, the distance between the two ends of the spring piece structure in the length direction is less than the distance between the two short edge protrusions, so that at least one of the two ends of the spring piece structure in the length direction is spaced apart from the corresponding two short edge protrusions.

[0010] Preferably, when the lower cover is in the first position, the highest point of the upwardly bulging middle region of the spring structure is flush with the upper end face of the long protrusion and is spaced apart from the lower surface of the upper cover.

[0011] Preferably, when the lower cover is in the second position, the two ends of the spring structure along its length direction abut against the two short protrusions respectively, and the highest point of the upwardly bulging middle region of the spring structure abuts against the lower surface of the upper cover.

[0012] Preferably, the distance between the two ends of the spring structure along its width direction is less than or equal to the distance between the two long protrusions.

[0013] Preferably, the upper cover and the lower cover are both rectangular and are connected by snap fitting. The upper cover is provided with a clamping groove at its two ends along its length direction, and the lower cover is provided with a clamping buckle at its two ends along its length direction, the clamping buckle being engaged with the clamping groove. The clamping buckle has a freedom of movement in a set direction in the clamping groove, so that the lower cover is movable relative to the upper cover.

[0014] Preferably, the upper surface of the lower cover has a first region and a second region with a height higher than the first region, and the second region is provided with a limiting hole penetrating through its upper and lower surfaces. The cross-sectional shape of the elastic member is L-shaped, including a first segment between the first region and the upper cover, and a second segment inserted in the limiting hole. When the lower cover is in the first position, the end of the first segment opposite to the second segment abuts against the upper surface of the first region, and the connection between the second segment and the first segment abuts against the upper end edge of the limiting hole.

[0015] In the embodiment, the combined gland is specifically a three combined structure in a sandwich type, the cover body is made of a glass fiber reinforced nylon material (for example, PA66+GF25), has a fireproof level of VO, an RTI value (Relative Temperature Index) of 130℃, and a CTI value (Comparative Tracking Index) of level 1. Moreover, the cover body made of the material has the characteristics of high strength and high temperature resistance, so that the gland is not easy to deform and fatigue under high temperature heating, and thus the compression effect can be maintained for a long time.

[0016] In addition, the elastic member is made of high-strength spring steel. Under a specified torque, the elastic member will be deformed to generate a downward pressure, so as to firmly attach the MOS tube or IGBT chip to the heat sink or ceramic sheet, thereby achieving the effect of elastic compression and anti-loosening. Under strict environmental temperature changes and high vibration environment, the fastening thread will not loosen and the elastic pressure will not decay due to the compression force exerted by the elastic deformation of the elastic member, so that the MOS tube or IGBT chip has a more reliable heat dissipation effect. In addition, the outer surface of the elastic member is coated with resin to strengthen the creepage distance and increase the insulation of the elastic member.

[0017] The combined pressure cover of this embodiment can be widely used in the field of electronic chips, and has the advantages of good elasticity, long-lasting and stable force, and not easy to slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the combined gland according to Example 1 of the present utility model;

[0019] Figure 2 for Figure 1 sectional view of

[0020] Figure 3 It is a three-dimensional diagram of the combined gland according to Example 2 of the present utility model;

[0021] Figure 4 for Figure 3 sectional view of

[0022] Figure 5 This is a three-dimensional diagram of a combined gland according to Example 3 of the present utility model;

[0023] Figure 6 for Figure 5 sectional view of . DETAILED DESCRIPTION

[0024] like Figures 1 to 4 As shown, the combined pressure cover 300 of this embodiment includes a cover body 100 and an elastic member 200. The cover body 100 has a cavity 103 therein and is made of glass fiber reinforced nylon. It includes an upper cover 101 and a lower cover 102 connected to each other. The lower cover 102 can repeatedly move between a first position and a second position along a set direction L relative to the upper cover 101. When in the first position, the upper surface of the lower cover 102 is separated from the lower surface of the upper cover 101 by a first distance D1. When in the second position, the upper surface of the lower cover 102 is separated from the lower surface of the upper cover 101 by a second distance D2, which is greater than the first distance D1. The elastic member 200 is disposed within the cavity 103 and applies a reset force to the lower cover 102. This reset force maintains the lower cover 102 in the second position or ensures that the lower cover 102 always has a tendency to move from the first position toward the second position.

[0025] When the lower cover 102 is in the second position, the elastic member 200 does not exert force on the lower cover 102, and the upper cover 101 and the lower cover 102 are in a relatively relaxed state. When it is necessary to compress the target object, such as a MOS tube or an IGBT chip, the upper cover 101 is operated to compress the combined cover 300 as a whole towards the target object, and the target object drives the lower cover 102 to gradually move towards the first position close to the upper cover 101 by exerting a reverse force on the lower cover 102, and in the process, the elastic member 200 is in contact with the lower surface of the upper cover 101. With the continuous movement of the lower cover 102, the elastic member 200 is gradually compressed until the lower cover 102 reaches the first position and stops. Because the elastic member 200 is compressed to different degrees, different reverse forces can be generated on the lower cover 102. Therefore, by adjusting the compression degree of the combined cover 300, the target object can be subjected to different compression forces as required, and the compression force can be floating with the compression degree of the elastic member 200.

[0026] In the embodiment, the combined cover 300 is specifically a sandwich type three combined structure, the cover body 100 is made of a glass fiber reinforced nylon material (for example, PA66+GF25), has a fireproof level of VO, and an RTI value (Relative Temperature Index) can reach 130℃, and a CTI value (Comparative Tracking Index) can reach level 1. Moreover, the cover body 100 made of the material has the characteristics of high strength and high temperature resistance, so that the cover 300 is not easy to deform and fatigue under high temperature heating, and thus the compression effect can be maintained for a long time.

[0027] In the embodiment, the elastic member 200 is made of high-strength spring steel. Under a specified torque, the elastic member 200 will be deformed to generate a compression force, so that the MOS tube or the IGBT chip is firmly attached to the heat sink or the ceramic sheet, and an elastic compression anti-loosening effect is achieved. Under strict environmental temperature changes and in a high-vibration environment, the fastening thread will not loosen and the elastic pressure will not decay due to the compression force exerted by the elastic deformation of the elastic member 200, so that the MOS tube or the IGBT chip has a more reliable heat dissipation effect. In addition, the outer surface of the elastic member 200 is coated with resin to strengthen the creepage distance and increase the insulation of the elastic member 200.

[0028] The combined cover 300 of the embodiment can be widely applied in the field of electronic chips and has the advantages of good flexibility, long-lasting and stable force, and not easy to slip, etc.

[0029] Embodiment 1

[0030] As Figure 1 and Figure 2As shown, the elastic member 200 is a spring structure with a middle region 203 bulging upward, and is generally in the shape of a rectangular sheet. The upper surface of the lower cover 102 is formed with a generally rectangular receiving groove 104 matching the shape of the spring structure, and the receiving groove 104 cooperates with the lower surface of the upper cover 101 to define the cavity 103. The receiving groove 104 is formed by four long strip-shaped protrusions successively connected at their ends and formed on the upper surface of the lower cover 102, and the four long strip-shaped protrusions include short side protrusions 105 at the two ends in the length direction and long side protrusions (not shown) at the two ends in the width direction. The two ends in the length direction of the spring structure are defined between the two short side protrusions 105, and the two ends in the width direction of the spring structure are defined between the two long side protrusions. In this way, the elastic member 200 can be positioned and the compression direction of the elastic member 200 can be defined.

[0031] The four long strip-shaped protrusions have the same height and are equal to the first distance D1, and are used to define the limit position of the lower cover 102 moving towards the upper cover 101 as the first position. When the lower cover 102 is in the first position, the distance between the two ends in the length direction of the spring structure is less than the distance between the two short side protrusions 105, so that at least one of the two ends in the length direction of the spring structure is spaced apart from the corresponding two short side protrusions 105 (as shown in FIG. 2). Figure 2 In this way, the elastic member 200 has a compression or deformation space in the length direction, which makes it possible for the lower cover 102 to move relative to the upper cover 101 and for the elastic member 200 to exert a downward restoring force on the lower cover 102. The distance between the two ends in the width direction of the spring structure is less than or equal to the distance between the two long side protrusions, which can avoid scratching of the elastic member 200 with the long side protrusions when compressed.

[0032] When the lower cover 102 is in the first position, the highest point of the upwardly bulging middle region 203 of the spring structure is flush with the upper end surface of the long strip-shaped protrusion and is spaced apart from the lower surface of the upper cover 101. When the lower cover 102 is in the second position, the two ends in the length direction of the spring structure respectively abut the two short side protrusions 105, and the highest point of the upwardly bulging middle region 203 of the spring structure abuts the lower surface of the upper cover 101. In this way, when the upper and lower covers 101, 102 are in the second position, which is the initial state of relative relaxation, the upper and lower covers 101, 102 are not in contact with the elastic member 200, so that no pre-tightening force is exerted between the upper and lower covers 101, 102 to urge the two covers to be spaced apart in the set direction L.

[0033] The upper cover 101 and the lower cover 102 are both rectangular and are connected by snap fitting. Specifically, the upper cover 101 is provided with a clamping groove 106 at the two ends in the length direction, and the lower cover 102 is provided with a clamping buckle 107 at the two ends in the length direction, and the clamping buckle 107 engages with the clamping groove 106. The clamping buckle 107 has a degree of freedom in the set direction L in the clamping groove 106, so that the lower cover 102 is movable relative to the upper cover 101.

[0034] Embodiment 2

[0035] As shown in Figure 3 and Figure 4 , the upper surface of the lower cover 102 has a first region 1021 and a second region 1022 with a height higher than the first region 1021, and the second region 1022 is provided with a limiting hole 1023 penetrating through its upper and lower surfaces. The cross-sectional shape of the elastic member 200 is L-shaped, including a first section 201 between the first region 1021 and the upper cover 101, and a second section 202 inserted in the limiting hole 1023. When the lower cover 102 is in the first position, the end (free end) of the first section 201 facing away from the second section 202 abuts against the upper surface of the first region 1021, and the connection of the second section 202 and the first section 201 abuts against the upper end edge of the limiting hole 1023. In this way, by virtue of the upper cover 101 having a concave-convex upper surface, when the target object needs to be compressed, the free end of the first section 201 of the L-shaped elastic member 200 and the connection of the two sections form double support points, realizing the application of the resetting force to the lower cover 102.

[0036] Embodiment 3

[0037] As shown in Figure 5 and Figure 6 , the main difference between this embodiment and the combined cover 300 of Embodiment 2 is that the cover body 100 only includes the upper cover 101 without the lower cover 102. At this time, the elastic member 200 is fixed on the upper cover 101 by buckling. The principle is that the target object to be compressed is compressed by directly contacting the elastic member 200, and other structures are basically the same as those of Embodiment 2, which will not be repeated here.

[0038] The above only describes several embodiments of the present application, and those skilled in the art can make various modifications or changes to the embodiments of the present application according to the disclosed content of the application without departing from the spirit and scope of the present application.

Claims

1. A combination gland, characterized in that, The utility model provides a cover and elastic piece, wherein the cover has a cavity inside, is made of glass fiber reinforced nylon, and comprises an upper cover and a lower cover connected with the upper cover; the lower cover can move repeatedly between a first position and a second position along a set direction relative to the upper cover; when the lower cover is at the first position, the upper surface of the lower cover is apart from the lower surface of the upper cover by a first distance; when the lower cover is at the second position, the upper surface of the lower cover is apart from the lower surface of the upper cover by a second distance; the second distance is greater than the first distance; the outer surface of the elastic piece is covered with resin and is arranged in the cavity to apply a reset force to the lower cover; the reset force keeps the lower cover at the second position or makes the lower cover always have a tendency to move from the first position to the second position.

2. The combination closure of claim 1 wherein, The elastic piece is a spring structure with an upwardly raised middle region, and the spring structure is substantially rectangular; the upper surface of the lower cover is formed with a substantially rectangular receiving groove matching the shape of the spring structure; and the receiving groove and the lower surface of the upper cover jointly define the cavity.

3. The combination closure of claim 2 wherein, The receiving groove is formed by four long strip-shaped protrusions connected in sequence at the head and tail on the upper surface of the lower cover, and the four long strip-shaped protrusions include short edge protrusions at both ends in the length direction and long edge protrusions at both ends in the width direction; both ends in the length direction of the spring structure are defined between two short edge protrusions, and both ends in the width direction of the spring structure are defined between two long edge protrusions.

4. The combination closure of claim 3 wherein, The four long strip-shaped protrusions have the same height and are equal to the first distance, so as to define the limit position of the lower cover moving towards the upper cover as the first position.

5. The combination closure of claim 3 wherein, When the lower cover is at the first position, the distance between both ends in the length direction of the spring structure is less than the distance between two short edge protrusions, so that at least one of both ends in the length direction of the spring structure is spaced apart from the corresponding two short edge protrusions.

6. The combination closure of claim 3 wherein, When the lower cover is at the first position, the highest point of the upwardly raised middle region of the spring structure is flush with the upper end surface of the long strip-shaped protrusion and is spaced apart from the lower surface of the upper cover.

7. The combination closure of claim 3 wherein, When the lower cover is at the second position, both ends in the length direction of the spring structure respectively abut two short edge protrusions, and the highest point of the upwardly raised middle region of the spring structure abuts the lower surface of the upper cover.

8. The combination closure of claim 3 wherein, The distance between both ends in the width direction of the spring structure is less than or equal to the distance between two long edge protrusions.

9. The combination closure of claim 1 or 8 wherein, The upper cover and the lower cover are both rectangular and are connected by buckling; the upper cover is provided with clamping grooves at both ends in the length direction, the lower cover is provided with buckles at both ends in the length direction, the buckles are engaged with the clamping grooves, and the buckles have a degree of freedom movable along the set direction in the clamping grooves, so that the lower cover can move relative to the upper cover.

10. The combination closure of claim 1 wherein, The upper surface of the lower cover has a first region and a second region with a height higher than the first region, and the second region is provided with a limiting hole penetrating through the upper and lower surfaces thereof; the cross-sectional shape of the elastic member is L-shaped, including a first section between the first region and the upper cover, and a second section inserted in the limiting hole; when the lower cover is in the first position, the end of the first section opposite to the second section abuts against the upper surface of the first region, and the connection between the second section and the first section abuts against the upper end edge of the limiting hole.

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