Cable

Abstract

The utility model discloses a cable, which comprises one or more groups of signal units, each group of signal unit comprises a core wire and an inner isolating layer, and the core wire comprises a conductor and an insulating layer coated on the conductor; the inner isolation layer coats the outer side of the insulating layer; the outer isolation layer is arranged on the outer side of the inner isolation layer and wraps one or more groups of signal units of the cable; at least one of the outer isolation layer and the inner isolation layer contains a shielding layer. The cable is simple in structure and high in stability, can be applied to a liquid cooling server, and is immersed in a cooling liquid, so that the cable is not easy to disperse, and the liquid is not easy to enter the shielding layer.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a cable. Background Art

[0002] A liquid-cooled server is a server that is injected with liquid and uses heat exchange to remove the heat from the server. Based on the physical form of the server, there are two types: cold plate liquid-cooled servers and fully immersed liquid-cooled servers. An immersed liquid-cooled server completely immerses the server motherboard, CPU, memory and other components with high heat generation in the refrigerant. When the refrigerant temperature rises to the boiling point corresponding to the system pressure, the refrigerant changes phase from liquid to gas, and absorbs heat through vaporization heat to achieve heat transfer. This technology of cooling by absorbing heat through the refrigerant is called phase change liquid cooling technology.

[0003] When existing cables are used in liquid-cooled servers, due to long-term liquid cooling conditions and immersion in coolant, the shielding layer of the cable is easy to spread out, and the liquid is easy to enter the shielding layer, resulting in poor SI performance and stability, and cannot be used normally in liquid-cooled servers. Utility Model Content

[0004] The purpose of the utility model is to provide a cable that can be used in a liquid cooling server. To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a cable, comprising: one or more groups of signal units, each group of signal units comprises a core wire and an inner isolation layer, the core wire comprises a conductor and an insulating layer coated on the conductor; the inner isolation layer is coated on the outer side of the insulating layer; an outer isolation layer is arranged on the outer side of the inner isolation layer, and coats the one or more groups of signal units of the cable; at least one of the outer isolation layer or the inner isolation layer contains a shielding layer.

[0006] In some embodiments, the inner isolation layer is an aluminum foil layer or a copper foil layer with shielding function.

[0007] In some embodiments, the inner isolation layer includes a first isolation material layer. Further, the inner isolation layer also includes an inner shielding layer, and the first isolation material layer is disposed on the outer side or the inner side of the inner shielding layer.

[0008] In some embodiments, the outer isolation layer includes a second isolation material layer.

[0009] Furthermore, the outer isolation layer also includes an outer shielding layer, and the second isolation material layer is arranged outside the outer shielding layer.

[0010] The material of the first insulating material layer is any one of PE, PP, PTFE and FEP. The material of the second insulating material layer is PE, PP, PTFE, FEP, PET layer or PI layer.

[0011] Preferably, it further comprises a ground wire, wherein one or two ground wires are provided and are located between the inner isolation layer and the outer isolation layer.

[0012] Preferably, the thickness of the inner isolation layer is ≤0.15 mm.

[0013] The inner insulating layer is coated on the insulating layer in a longitudinal straight wrapping or spiral wrapping manner; the outer insulating layer is coated on the ground wire and the outer side of the inner insulating layer in a longitudinal straight wrapping or spiral wrapping manner. Preferably, the inner insulating layer is coated on the insulating layer in a longitudinal straight wrapping manner; in this case, the straight wrapping manner is used to wrap the insulating layer, which can reduce the coating thickness and improve the SI performance of the wire. Preferably, the outer insulating layer is coated on the ground wire and the outer side of the inner insulating layer in a spiral wrapping manner. In this case, the spiral wrapping manner is used to better wrap the ground wire in the gap between the inner insulating layer and the outer insulating layer.

[0014] Wherein, the signal unit is a differential signal unit. Two conductors are arranged in the core wire, and the insulation layer is coated on the two conductors at the same time.

[0015] Furthermore, the cross-sectional outer contour of the insulating layer is formed by connecting the first semicircular arc, the first straight line, the second semicircular arc and the second straight line end to end in sequence; the two conductors are located at the center of the first semicircular arc and the second semicircular arc respectively. Through this arrangement, the conductor is located at the center of the first semicircular arc and the second semicircular arc, and the concentricity is good.

[0016] Preferably, the distance between the long sides of the cross-sectional outer contour of the insulating layer is a, and the diameter of the conductor is b, then a≥4b. With this arrangement, the insulating layer has a certain thickness to adapt to use in a liquid cooling environment.

[0017] In some embodiments, the insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer is respectively coated on the outside of the two conductors, the second insulating layer is coated on the outside of the first insulating layer, and there is no gap between the second insulating layer and the first insulating layer.

[0018] Wherein, the material of the insulating layer is any one of PE, PP, PTFE, and FEP; and the shielding layer is an aluminum foil layer or a copper foil layer.

[0019] Preferably, the cable is a flat cable.

[0020] Due to the adoption of the above structure, the utility model has the following beneficial effects:

[0021] 1. The utility model provides an inner isolation layer and an outer isolation layer, so that the cable is not easy to spread out when immersed in liquid. The overall cable volume is small and the structure is simple, and a miniaturized design can be achieved.

[0022] 2. The insulation layer of the utility model cable is coated on two conductors at the same time, and is extruded and formed at the same time in production. It has high stability when immersed in liquid, and SI performance is less affected under liquid cooling conditions.

[0023] 3. The ground wire of the utility model is arranged between the inner isolation layer and the outer isolation layer. The gap between the inner isolation layer and the outer isolation layer forms a channel for accommodating liquid, which can prevent the liquid from entering the core wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of the cable of the first embodiment.

[0025] Figure 2 It is a schematic diagram of the structure of the cable of the second embodiment.

[0026] Figure 3 yes Figure 2 Schematic cross-section of .

[0027] Figure 4 It is a schematic cross-sectional view of the cable in the third embodiment.

[0028] Figure 5 It is a schematic cross-sectional view of the cable in the fourth embodiment.

[0029] Figure 6 It is a schematic cross-sectional view of the cable in the fifth embodiment.

[0030] Figure 7 It is a cross-sectional schematic diagram of the cable in Example 6.

[0031] Figure 8 It is a schematic diagram of the structure of the core wire in Embodiments 1 to 5.

[0032] Fig. 9 is a schematic diagram of the structure of the flat cable in the control group.

[0033] Fig.10 yes Fig. 9 Schematic cross-section of .

[0034] Fig.11 This is the TDD11 test chart of the control group flat cable.

[0035] Fig.12 This is the TDD22 test chart of the control group flat cable.

[0036] Fig.13 This is the SDD21 test chart of the control group flat cable.

[0037] Fig.14 This is the SCD21 test chart of the control group flat cable.

[0038] Fig.15 This is the TDD11 test diagram of the flat cable in the experimental group.

[0039] Fig.16 This is the TDD22 test chart of the flat cable in the experimental group.

[0040] Fig.17 This is the SDD21 test chart of the flat cable in the experimental group.

[0041] Fig.18 This is the SCD21 test chart of the flat cable in the experimental group.

[0042] Fig.19 This is the Impedance test chart of the control group.

[0043] Fig. 20 It is the IL test chart of the control group.

[0044] Fig.21 This is the Impedance test chart of the experimental group.

[0045] Fig. 22 It is the IL test chart of the experimental group.

[0046] Main component symbols:

[0047] 1: signal unit, 2: core wire, 21: conductor, 22: insulation layer, 221: first semicircular arc, 222: first straight line, 223: second semicircular arc, 224: second straight line, 23: first insulation layer, 24: second insulation layer, 3: inner isolation layer, 31: inner shielding layer, 32: first isolation material layer, 4: outer isolation layer, 41: outer shielding layer, 42: second isolation material layer, 5: ground wire. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The utility model discloses a cable, which can be a round cable or a flat cable. The accompanying drawings of this embodiment take the flat cable as an example for detailed description.

[0050] Embodiment 1

[0051] like Figure 1 As shown, the cable of this embodiment includes: one or more signal units 1 and an outer isolation layer 4. The figure only shows one group of signal units 1, and each group of signal units 1 includes a core wire 2 and an inner isolation layer 3.

[0052] The core wire 2 includes a conductor 21 and an insulating layer 22 coated on the conductor 21. In this embodiment, the signal unit 1 is a differential signal unit, that is, the core wire 2 includes two conductors 21 arranged side by side and an insulating layer 22 coated on the two conductors 21 at the same time.

[0053] The material of the insulating layer 22 can be any one of PE, PP, PTFE, and FEP. In this embodiment, FEP material is used. FEP material has good chemical inertness, excellent wear resistance and friction coefficient, and has excellent compactness after extrusion molding, which is convenient for use in low temperature environments.

[0054] The inner isolation layer 3 is coated on the outer side of the insulating layer 22. In this embodiment, the inner isolation layer 3 is an aluminum foil layer or a copper foil layer with a shielding function. The thickness of the aluminum foil layer or the copper foil layer is ≤ 0.1 mm. The surface of the aluminum foil layer or the copper foil layer can be directly adhered to the outer surface of the insulating layer 22, and the inner isolation layer 3 can be prevented from being separated from the insulating layer 22 when immersed in the coolant of the liquid-cooled server.

[0055] The outer isolation layer 4 is arranged outside the inner isolation layer 3 to cover one or more groups of signal units 1. In this embodiment, the outer isolation layer 4 is a second isolation material layer. The second isolation material layer is a PE, PP, PTFE, FEP, PET layer or PI layer. The surface of the second isolation material layer has glue and can be directly adhered to the outer side of the inner isolation layer 3 to play an isolation and protection role.

[0056] Embodiment 2

[0057] like Figure 2 , Figure 3 As shown, the cable of this embodiment includes: one or more signal units 1, a ground wire 5 and an outer isolation layer 4. The figure only shows one group of signal units, and each group of signal units 1 includes a core wire 2 and an inner isolation layer 3. In this embodiment, one shielding layer is provided, which is an outer shielding layer 41, which is provided inside the outer isolation layer.

[0058] The core wire 2 includes a conductor 21 and an insulating layer 22 coated on the conductor 21. In this embodiment, the signal unit 1 is a differential signal unit, that is, the core wire 2 includes two conductors 21 arranged side by side and an insulating layer 22 coated on the two conductors 21 at the same time.

[0059] The material of the insulating layer 22 can be any one of PE, PP, PTFE, and FEP. In this embodiment, FEP material is used. FEP material has good chemical inertness, excellent wear resistance and friction coefficient, and has excellent compactness after extrusion molding, which is convenient for use in low temperature environments.

[0060] The insulating layer 22 is simultaneously coated on the two conductors 21, and the insulating layer 22 and the two conductors 21 are formed into one body. During production, a vertical extrusion molding machine is used to extrude the insulating layer 22 and the two conductors 21, thereby forming them into one body, which has better stability.

[0061] Combination Figure 8 As shown, the insulating layer 22 is flat, and the outer contour of the cross section of the insulating layer 22 is a runway shape. The outer contour of the cross section is formed by connecting the first semicircular arc 221, the first straight line 222, the second semicircular arc 223 and the second straight line 224 in sequence. The two conductors 21 are respectively located at the center of the first semicircular arc 221 and the second semicircular arc 223. The distance between the long sides of the outer contour of the insulating layer 22 is a, and the diameter of the conductor 21 is b, then a≥4b. Through this setting, the conductor 21 and the insulating layer 22 have a relatively uniform thickness, which can better adapt to the liquid cooling environment.

[0062] In this embodiment, the inner isolation layer 3 is a first isolation material layer 32, and the material of the first isolation material layer 32 is any one of PE, PP, PTFE, and FEP. The thickness of the first isolation material layer 32 is ≤ 0.15 mm. The first isolation material layer 32 is coated and bonded to the outer surface of the insulating layer 22 in a longitudinal straight wrapping or spiral wrapping manner.

[0063] The outer isolation layer 4 includes an outer shielding layer 41 and a second isolation material layer 42, and the second isolation material layer 42 is arranged outside the outer shielding layer 41. The outer shielding layer 41 is an aluminum foil layer with a shielding function. The second isolation material layer 42 is a PE, PP, PTFE, FEP, PET layer or a PI layer.

[0064] The ground wire 5 is located between the first isolation material layer 32 and the outer shielding layer 41 . The outer shielding layer 41 is wrapped and bonded to the outer surface of the ground wire 5 and the first isolation material layer 22 in a rotationally wrapped manner.

[0065] The inner surface of the second insulating material layer 42 is coated with glue, and can be directly adhered to the outer side of the outer shielding layer 41 to play an isolation and protection role.

[0066] Embodiment 3

[0067] like Figure 4 As shown, the difference between this embodiment and the second embodiment is that the inner isolation layer 3 in this embodiment is an aluminum foil layer or a copper foil layer with a shielding function. The outer isolation layer 4 in this embodiment is a second isolation material layer 42 .

[0068] The aluminum foil layer or copper foil layer is coated and bonded to the outer surface of the insulating layer 22 in a longitudinal straight wrapping manner. The outer isolation layer 4 is arranged outside the inner isolation layer 3 to cover one or more groups of signal units 1. The second isolation material layer 42 is a Mylar layer or a flame-retardant PET layer or a flame-retardant PI layer.

[0069] The ground wire 5 is located between the inner isolation layer 3 and the second isolation material layer 42. The second isolation material layer 42 is wrapped and bonded to the outer surface of the ground wire 5 and the inner isolation layer 3 in a rotational wrapping manner, and plays a role of isolation and protection.

[0070] Embodiment 4

[0071] like Figure 5 As shown, the cable of this embodiment includes: one or more signal units 1, ground wires 5 and outer isolation layers 4. Only one signal unit 1 is shown in the figure, and each signal unit 1 includes a core wire 2 and an inner isolation layer 3.

[0072] The structure of the core wire in this embodiment is the same as that in the first embodiment.

[0073] In this embodiment, the inner isolation layer 3 is an aluminum foil layer or a copper foil layer with a shielding function, which is coated and bonded to the outer surface of the insulating layer 22 in a longitudinal straight wrapping or rotation wrapping manner.

[0074] The outer isolation layer 4 includes an outer shielding layer 41 and a second isolation material layer 42, and the second isolation material layer 42 is arranged on the outer side of the outer shielding layer 41. The outer shielding layer 41 is an aluminum foil layer or a copper foil layer. The second isolation material layer 42 is a Mylar layer or a flame-retardant PET layer or a flame-retardant PI layer. The surface of the second isolation material layer 42 is adhesive, and can be directly adhered to the outer side of the outer shielding layer 41 to play an isolation and protection role.

[0075] The ground wire 5 is located between the inner isolation layer 3 and the outer shielding layer 41 , and the outer shielding layer 41 is wrapped and bonded to the outer surface of the ground wire 5 and the inner isolation layer 3 in a rotationally wrapped manner.

[0076] Embodiment 5

[0077] like Figure 6 As shown, the cable of this embodiment includes: one or more signal units 1, a ground wire 5 and an outer isolation layer 4. The figure only shows one group of signal units 1, and each group of signal units 1 includes a core wire 2 and an inner isolation layer 3. The shielding layer of the cable of this embodiment is provided with two layers, namely, an inner shielding layer 31 provided in the inner isolation layer 3 and an outer shielding layer 41 in the outer isolation layer 4.

[0078] The structure of the core wire 2 in this embodiment is the same as that in the first embodiment.

[0079] In this embodiment, the inner isolation layer 3 includes a first isolation material layer 32 and an inner shielding layer 31. The inner shielding layer 31 is coated and bonded to the outer surface of the insulating layer 22 in a longitudinal straight wrapping or rotational wrapping manner. The inner shielding layer 31 is an aluminum foil layer or a copper foil layer. The material of the first isolation material layer 32 is any one of PE, PP, PTFE, and FEP, and the first isolation material layer 32 is coated and bonded to the outer surface of the inner shielding layer 31 in a longitudinal straight wrapping or rotational wrapping manner.

[0080] The outer isolation layer 4 includes an outer shielding layer 41 and a second isolation material layer 42, and the second isolation material layer 42 is arranged outside the outer shielding layer 41. The ground wire 5 is located between the first isolation material layer 32 and the outer shielding layer 41. The outer shielding layer 41 is coated and bonded to the outer surface of the first isolation material layer 32 and the ground wire 5 in a rotational wrapping manner. The second isolation material layer 42 is a Mylar layer or a flame-retardant PET layer or a flame-retardant PI layer. The inner surface of the second isolation material layer 42 is adhesive and can be directly adhered to the outer side of the outer shielding layer 41.

[0081] Embodiment 6

[0082] like Figure 7 As shown, the cable of this embodiment includes: one or more signal units 1, ground wires 5 and outer isolation layers 4. Only one signal unit 1 is shown in the figure, and each signal unit 1 includes a core wire 2 and an inner isolation layer 3.

[0083] The core wire 2 includes a conductor 21 and an insulating layer 22 coated on the conductor 21. In this embodiment, the signal unit 1 is a differential signal unit, that is, the core wire 2 includes two conductors 21 arranged side by side and an insulating layer 22 coated on the two conductors 21 at the same time. The insulating layer 22 includes a first insulating layer 23 and a second insulating layer 24, the first insulating layer 23 is coated on the outside of the two conductors 22 respectively, and the cross-section of the first insulating layer 23 is circular. The second insulating layer 24 is coated on the outside of the first insulating layer 23 of the two conductors 22, and there is no gap between the second insulating layer 24 and the first insulating layer 23. There is no gap between the first insulating layer 23 and the second insulating layer 24, which can prevent liquid from entering the interior. During production, the two conductors 22 are first molded with the first insulating layer 23 respectively, and then the two conductors 21 coated with the first insulating layer 23 and the second insulating layer 24 are double-extruded and integrally molded using a vertical extrusion extrusion molding machine. The material of the first insulating layer 23 and the second insulating layer 24 can be any one of PE, PP, PTFE, and FEP.

[0084] In this embodiment, the structure of the inner isolation layer 3 and the outer isolation layer 4 can adopt any one of the structures in Embodiments 2 to 5. The ground wire 5 is arranged between the inner isolation layer 3 and the outer isolation layer 4.

[0085] When in use, the cable of the utility model can be directly immersed in the coolant of the liquid-cooled server and has good stability and SI performance.

[0086] The utility model cable was tested, and the test process and results are as follows:

[0087] 1. Group setting: Set up a control group and an experimental group.

[0088] The experimental group is the flat cable of Example 2, and the control group is Fig. 9 , Fig.10The flat cable comprises a core wire 1', a resin film layer 2', a shielding layer 3', a protective layer 4' and a ground wire 5'. The core wire 1' comprises two conductors 11' arranged side by side and two insulating layers 12' respectively coated on the conductors 11'. The insulating layers 12' are respectively coated on the two conductors 11', so that the two core wires are independent of each other.

[0089] 2. Test 1

[0090] The flat cables of the control group and experimental group were subjected to TDD11, TDD22, SDD21, SCD21, Impedance and IL tests.

[0091] The test results of the control group in the TDD11, TDD22, SDD21, and SCD21 tests are as follows: Figure 11-14 As shown, the test results of the experimental groups in the TDD11, TDD22, SDD21, and SCD21 tests are as follows: Figure 15-18 shown.

[0092] 3. Test 2

[0093] The flat cables of the control group and the experimental group were placed in the air for initial Impedance and IL tests, and then the flat cables of the control group and the experimental group were immersed in the coolant for Impedance and IL tests.

[0094] The test results of the control group are as follows Fig.19 , Fig. 20 As shown in the figure, the red line in the two figures is the data of the initial test in air, and the green line is the data immersed in the coolant. It can be seen from the figure that the performance of the flat cable in the control group is seriously degraded after immersion.

[0095] The test results of the experimental group are as follows Fig.21 , Fig. 22 As shown in the figure, the red line in the two figures is the data of the initial test in the air, and the green line is the data immersed in the coolant. From the figure, it can be seen that the performance of the flat cable in the experimental group after immersion is not much different from the initial data, and the performance is stable. The test results of the flat cable in the experimental group are obviously better than those in the control group.

[0096] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A cable, characterized in that: include: One or more signal units (1), each signal unit comprising a core wire (2) and an inner insulating layer (3), the core wire (2) comprising a conductor (21) and an insulating layer (22) coated on the conductor (21); the inner insulating layer (3) is coated on the outer side of the insulating layer (22); An outer isolation layer (4) is arranged outside the inner isolation layer (3) and covers one or more groups of signal units (1) of the cable; At least one of the outer isolation layer (4) or the inner isolation layer (3) contains a shielding layer.

2. The cable according to claim 1, characterized in that: The inner isolation layer (3) is an aluminum foil layer or a copper foil layer with a shielding function.

3. The cable according to claim 1, characterized in that: The inner isolation layer (3) comprises a first isolation material layer (32).

4. The cable according to claim 3, characterized in that: The inner isolation layer (3) further comprises an inner shielding layer (31), and the first isolation material layer (32) is arranged on the outside or inside of the inner shielding layer (31).

5. The cable according to claim 1, characterized in that: The outer isolation layer (4) comprises a second isolation material layer (42).

6. The cable according to claim 5, characterized in that: The outer isolation layer (4) further comprises an outer shielding layer (41), and the second isolation material layer (42) is arranged outside the outer shielding layer (41).

7. The cable according to claim 3 or 4, characterized in that: The material of the first isolation material layer (32) is any one of PE, PP, PTFE and FEP.

8. The cable according to claim 5 or 6, characterized in that: The material of the second isolation material layer (42) is PE, PP, PTFE, FEP, PET layer or PI layer.

9. The cable according to any one of claims 1 to 6, characterized in that: It also includes a ground wire (5), one or two of which are provided and are located between the inner isolation layer (3) and the outer isolation layer (4).

10. The cable according to claim 1, characterized in that: The inner isolation layer (3) has a thickness of ≤0.1 mm.

11. The cable according to claim 9, characterized in that: The inner isolation layer (3) is coated on the insulating layer (22) in a longitudinal straight wrapping or spiral wrapping manner; the outer isolation layer (4) is coated on the outer side of the ground wire (5) and the inner isolation layer (3) in a longitudinal straight wrapping or spiral wrapping manner.

12. The cable according to claim 1, characterized in that: The signal unit (1) is a differential signal unit.

13. The cable according to claim 1, characterized in that: Two conductors (21) are arranged in the core wire (2), and the insulating layer (22) is coated on the two conductors (21) at the same time.

14. The cable according to claim 13, characterized in that: The cross-sectional outer contour of the insulating layer (22) is formed by connecting a first semicircular arc (221), a first straight line (222), a second semicircular arc (223), and a second straight line (224) in sequence end to end; the two conductors (21) are respectively located at the center of the first semicircular arc (221) and the second semicircular arc (223).

15. The cable according to claim 14, characterized in that: The distance between the long sides of the cross-sectional outer contour of the insulating layer (22) is a, and the diameter of the conductor (21) is b, then a≥4b.

16. The cable according to claim 1, characterized in that: The insulating layer (22) comprises a first insulating layer (23) and a second insulating layer (24), wherein the first insulating layer (23) is respectively coated on the outside of the two conductors (21), and the second insulating layer (24) is coated on the outside of the first insulating layer (23), and there is no gap between the second insulating layer (24) and the first insulating layer (23).

17. The cable according to claim 1, characterized in that: The material of the insulating layer (22) is any one of PE, PP, PTFE, and FEP; and the shielding layer is an aluminum foil layer or a copper foil layer.

18. The cable according to claim 1, characterized in that: The cable is a flat cable.

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