Double-layer flow guide pipe of liquid cooling heat dissipation system

Abstract

The utility model relates to a double-layer flow guide pipe of a liquid cooling heat dissipation system, which comprises an outer-layer pipe, the outer-layer pipe is a corrugated pipe, an inner-layer pipe is sleeved in the outer-layer pipe, the inner-layer pipe is a smooth pipe with a smooth inner wall, the outer-layer pipe comprises a corrugated section, parallel sections with smooth inner walls are arranged at two ends of the corrugated section, and the outer-layer pipe is a corrugated pipe. The outer-layer pipe is fixed to the inner-layer pipe at the positions of parallel sections at the two ends, the inner-layer pipe and the outer-layer pipe are connected together in a sleeved mode to form a double-layer pipe structure, at the moment, cold liquid flows in the inner-layer pipe, and when the inner-layer pipe leaks, the outer-layer pipe at the outer side position can still conduct protection, so that the cold liquid is isolated, and the service life of the cold liquid is prolonged. And the cold liquid is prevented from flowing out of the double-layer flow guide pipe, so that the damage of the cold liquid to electronic parts is avoided.

Description

Technical Field

[0001] The utility model relates to the field of heat dissipation structures, in particular to a double-layer flow guide pipe of a liquid cooling heat dissipation system. Background Art

[0002] The basic principle of the liquid cooling system is to use liquid as a medium for heat conduction to transfer the heat generated by the heat source to the cold liquid. At this time, the cold liquid with heat is pressurized by the liquid pump and circulated to the external water cooling or air cooling row. The cold liquid in the liquid cooling row is cooled by a chiller or fan. After the cooling, the cold liquid is circulated to the heat source again for heat transfer, thereby achieving the requirement of stable operation of the heat source. At this time, the liquid cooling system basically consists of a refrigeration plate, a liquid pump, a guide pipe, a cold liquid and a fan or a chiller. Its structural composition is as follows: Figure 1 shown.

[0003] In recent years, liquid cooling systems have been widely used in electronic servers (computer servers) for heat dissipation. Their function is to remove the heat generated by the high-speed computing of the central processing unit (such as CPU, GPU, etc.) in the server and discharge it to maintain the stable life of the equipment. Its structure is as follows: Figure 1 As shown, due to the precise design of the overall structure of the server and the placement of electronic components in a limited space, the guide pipes connected to the cooling plate (locked to the heat source such as the central processing unit) need to be distributed in a small space or even bent to avoid the components in the server. In addition to being temperature-resistant, pressure-resistant, acid-resistant, and alkali-resistant, and aging-resistant, the guide pipes must also be soft and have a very small bending radius. Therefore, polytetrafluoroethylene bellows are commonly used guide pipe materials.

[0004] Since the guide tube contains cold liquid and is distributed among many electronic parts, there must be no leakage risk in the tank itself or at the joints of the connectors. Otherwise, the cold liquid will leak into the electronic substrate and cause serious damage to the server, which will directly endanger public safety. The polytetrafluoroethylene corrugated guide tubes currently in general use are all single-layer structures. If they are of poor quality or damaged, resulting in cold liquid leakage, the above-mentioned risks will occur, and there is no ability to prevent or predict. Utility Model Content

[0005] Based on this, it is necessary to provide a double-layer guide tube for a liquid cooling system to address the problems in the prior art. The double-layer guide tube adopts an inner and outer layer structure. If the cold liquid leaks in the inner layer, it is still protected by the outer layer tube, which can isolate the cold liquid and prevent it from overflowing to the electronic components. In addition, when the inner layer leaks, it can be detected and the relevant personnel can deal with it in time to avoid the risk of damage.

[0006] A double-layer guide tube for a liquid cooling system, characterized in that it includes an outer tube, the outer tube is a corrugated tube, an inner tube is sleeved inside the outer tube, the inner tube is a smooth tube with a smooth inner wall, the outer tube includes a corrugated section, both ends of the corrugated section are provided with parallel sections with smooth inner walls, and the outer tube is fixed to the inner tube at the parallel section positions at both ends.

[0007] In one embodiment, the outer tube and the inner tube are made of polytetrafluoroethylene.

[0008] In one embodiment, the outer tube is transparent or translucent.

[0009] In one of the embodiments, a detection sheet that changes color when exposed to water is provided between the outer tube and the inner tube.

[0010] In one embodiment, the thickness of the outer tube and the inner tube are both 0.7 mm-1.0 mm.

[0011] In one embodiment, the inner diameter of the outer tube is 0.1 mm to 0.5 mm larger than the outer diameter of the inner tube.

[0012] The above-mentioned liquid cooling system has a double-layer guide tube, and the inner tube and the outer tube are sleeved together to form a double-layer tube structure. At this time, the cold liquid flows in the inner tube. When the inner tube leaks, the outer tube at the outer position can still be protected, thereby isolating the cold liquid and preventing the cold liquid from flowing out to the outside of the double-layer guide tube, thereby preventing the cold liquid from damaging the electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the heat dissipation system in the prior art;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of a double-layer guide tube of a liquid cooling and heat dissipation system of the utility model;

[0015] Figure 3 The double-layer guide pipe of the liquid cooling system of the utility model is connected with the connecting pipe

[0016] Figure 4 This is a schematic diagram of the outer tube structure of the double-layer guide tube of the liquid cooling system of the utility model;

[0017] Figure 5 This is a schematic diagram of the inner tube structure of the double-layer guide tube of the liquid cooling system of the utility model;

[0018] Figure 6 This is a schematic diagram of the test dimensions of the double-layer tube of the utility model;

[0019] Figure 7 This is a schematic diagram of the test dimensions of a single-layer tube of the utility model;

[0020] Figure 8 This is a schematic diagram of the connection between the double-layer pipe and the connecting pipe of the utility model;

[0021] Fig. 9 This is a schematic diagram of the connection between the single-layer pipe and the connecting pipe of the utility model;

[0022] Fig.10 It is a schematic diagram of the parallel section holding force test of the utility model.

[0023] Among them, 1. Fan; 2. Liquid cooling radiator; 3. Pump; 4. Guide tube; 5. Refrigeration block; 6. Heat source; 7. Outer tube; 8. Inner tube; 9. Detection piece; 10. Connector; 11. Core rod. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] like Figures 2 to 5 As shown, a double-layer guide tube of a liquid cooling system includes an outer tube, which is a corrugated tube. An inner tube is sleeved inside the outer tube, and the inner tube is a smooth tube with a smooth inner wall. The outer tube includes a corrugated section, and parallel sections with smooth inner walls are provided at both ends of the corrugated section. The outer tube is fixed to the inner tube at the parallel section positions at both ends.

[0028] At this time, the flow guide tube is used for the transmission of cold liquid. In this embodiment, the outer tube and the inner tube are made of polytetrafluoroethylene. The outer tube and the inner tube made of polytetrafluoroethylene have good corrosion resistance, weather resistance, anti-bending property, and wide temperature resistance range (-65℃~260℃). At the same time, the material is moderately soft and hard, and can be directly assembled with the connector.

[0029] Since the inner tube and the outer tube are sleeved together and then fixed at both ends, in this embodiment, the inner diameter of the outer tube is 0.1mm-0.5mm larger than the outer diameter of the inner tube. Specifically in this embodiment, the inner diameter of the layer tube is 0.1mm larger than the outer diameter of the inner tube to ensure that the inner tube can be sleeved inside the inner tube. Further, in order to ensure that the outer tube has a certain degree of flexibility, the thickness of the outer tube and the inner tube are both 0.7mm-1.0mm. In this embodiment, the thickness of the outer tube is 0.7mm, and the thickness of the inner tube is 0.75mm, which can avoid the lack of flexibility due to being too thick, and of course, it can also avoid low permeability due to being too thin.

[0030] When the inner tube is damaged and cold liquid seeps out, in order to be able to observe the cold liquid seepage in time, in this embodiment, the outer tube is transparent or translucent. In this way, the state of the inner tube can be observed through the transparent or translucent outer tube. Further, in order to more conveniently observe whether there is leakage, in this embodiment, a water-discoloring detection sheet is provided between the outer tube and the inner tube. After the detection sheet encounters cold liquid, the color will change, so that it can be intuitively observed whether the inner tube is leaking. For the detection sheet, it is necessary to have the characteristic of changing color when encountering water. Specifically, paper, cloth, coating, plastic and other products with relevant characteristics can be used, such as waterproof labels. At this time, in order to conveniently put the detection sheet between the inner tube and the outer tube, the thickness of the detection sheet is 0.1mm-1mm. When the thickness of the detection sheet is greater than the gap between the inner tube and the outer tube, the detection sheet can be a certain flexibility, such as a cloth detection sheet, so as to be conveniently put into the gap between the inner tube and the outer tube.

[0031] The inner tube needs to be sleeved inside the outer tube. At the same time, the two ends of the inner tube and the outer tube need to be fixed. The assembly steps for the double-layer tube are as follows:

[0032] (1) First, take an inner tube (smooth tube) of the required length and diameter, place it into an outer tube (corrugated tube) of the same length, and place a water-discoloring test piece in the gap between the inner and outer tubes;

[0033] (2) After the belt is assembled, heat the parallel sections at both ends of the prepared double-layer flow guide pipe to above the melting point of polytetrafluoroethylene (327°C) and apply a certain pressure;

[0034] (3) After maintaining the pressure for 10 minutes, the temperature is slowly lowered and allowed to cool, thereby bonding and fixing the inner tube and the outer tube in parallel sections.

[0035] Performance Test:

[0036] Select a length of 550mm, an outer tube outer diameter of 10.5mm, a parallel section outer diameter of 9.0mm, an inner diameter of 7.6mm, a thickness of 0.7mm, a parallel section length of 25mm, a corrugated section adjacent wave peak spacing of 3.5mm, an inner tube outer diameter of 7.5mm, an inner diameter of 6.0mm, and a thickness of 0.75mm to form a double-layer tube (such as Figure 6 shown).

[0037] A single-layer corrugated tube was selected for comparison test. The length of the single-layer corrugated tube is 550mm, the outer diameter is 10.0mm, the outer diameter of the parallel section is 8.0mm, the inner diameter is 6.0mm, the thickness is 0.75mm, the length of the parallel section is 25mm, and the spacing between adjacent wave peaks in the corrugated section is 3.5mm (such as Figure 7 shown).

[0038] 1. Bending radius test, the results are as follows:

[0039]

[0040]

[0041] 2. Working pressure test, test components such as Figure 8 and Fig. 9 Shown:

[0042] Test conditions: water is placed in the pipe and a water pressure test of 10kg / ㎡ is applied for 1 hour. The results are as follows:

[0043] 10kg / ㎡ water pressure holding test Double-layer pipe guide tube No leakage Single-layer corrugated pipe guide tube No leakage

[0044] 3. Burst pressure test, test components such as Figure 8 and Fig. 9 Shown:

[0045] Test conditions: Water is placed inside the pipe, and the pipe is subjected to burst pressure test at a pressure increase rate of 1.0kg / ㎡ per minute, and the highest pressure value at the time of burst is recorded.

[0046] Burst pressure(kg / ㎡) Double-layer pipe guide tube 23.0kg / ㎡ Single-layer corrugated pipe guide tube 20.0kg / ㎡

[0047] 4. Interference test

[0048] Based on the bending radius of 25mm, the bending test was performed 5000 times. After the bending times were completed, the pressure resistance was tested. The test results are as follows:

[0049]

[0050] 5. Parallel segment grip strength test, test placement as follows Fig.10 Shown

[0051] A metal core rod with an outer diameter of 6 mm is placed in the parallel section of the catheter with an insertion depth of 10 mm. The core rod is longitudinally divided into three equal parts. The mechanical structure is designed so that the three-part core rod can expand outward synchronously through the application of force.

[0052] The test conditions are as follows: the moving speed of the three equal parts of the mandrel to expand outward is 0.5mm / s, the maximum expansion stroke is 3mm, and the maximum force applied during the expansion process is recorded. The test results are as follows:

[0053]

[0054]

[0055] The greater the holding force, the better the fit between the guide tube and the connector ferrule.

[0056] 6. Flow blocking test

[0057] A double-layer flow guide tube with a total length of 5 m was prepared according to the attached figure. At this time, the inner diameter of the inner layer tube was 6.0 mm. In addition, a single-layer flow guide tube of the same length was prepared, and the inner diameter of the corrugated section was 6.0 mm, and a flow resistance test was carried out.

[0058] Test conditions: Apply a water pressure of 0.5kg / ㎡ from one side of the double-layer tube / single-layer guide tube as the inlet, and compare the water output at the outlet for one minute.

[0059] The test results are as follows:

[0060] Water flow at outlet / minute Double-layer pipe guide tube 1.35L Single-layer corrugated pipe guide tube 0.96L

[0061] The results show that the double-layer flow guide tube with smooth inner hole has lower flow resistance effect.

[0062] 7. Leakage of the inner layer of the double-layer flow guide pipe

[0063] Prepare the sample as shown in the figure, and place a 1.0 cm 2 Color-changing paper (a test piece that changes color when exposed to water), and then puncture the inner tube with a fine hole of about 0.1mm in diameter before preparation, and apply 0.2kg / cm 2 The water pressure flows naturally. Since the inner tube is damaged, cold liquid can be observed to slowly flow out from the punctured tiny holes in the inner tube, and overflow the color-changing paper within a certain period of time. The color change of the color-changing paper can be observed with the naked eye. Due to the protection of the outer tube, no leakage of cold liquid is observed. At this time, the color sensor can be used to align with the color-changing paper. When the cold liquid seeps out, the color-changing paper changes color. After the color sensor detects the signal, it can output a related signal, thereby realizing automatic detection.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A double-layer flow guide tube for a liquid cooling system, characterized in that: It includes an outer tube, which is a corrugated tube. An inner tube is sleeved inside the outer tube, and the inner tube is a smooth tube with a smooth inner wall. The outer tube includes a corrugated section, and parallel sections with smooth inner walls are arranged at both ends of the corrugated section. The outer tube is fixed to the inner tube at the parallel section positions at both ends.

2. The double-layer flow guide tube of the liquid cooling system according to claim 1, characterized in that: The outer tube and the inner tube are made of polytetrafluoroethylene.

3. The double-layer flow guide tube of the liquid cooling system according to claim 1, characterized in that: The outer tube is transparent or translucent.

4. The double-layer flow guide tube of the liquid cooling system according to claim 3, characterized in that: A detection sheet that changes color when exposed to water is arranged between the outer tube and the inner tube.

5. The double-layer flow guide tube of the liquid cooling system according to claim 1, characterized in that: The thickness of the outer tube and the inner tube are both 0.7mm-1.0mm.

6. The double-layer flow guide tube of the liquid cooling system according to claim 1, characterized in that: The inner diameter of the outer tube is 0.1 mm to 0.5 mm greater than the outer diameter of the inner tube.

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