Liquid cooling radiator and liquid cooling row thereof

Abstract

According to the liquid cooling row, occupying strips are arranged in flow channels of at least two heat dissipation pipes which are connected in parallel, and gaps are formed between the occupying strips and the inner walls of the heat dissipation pipes so that cold liquid can flow through the gaps. The liquid cooling radiator comprises the liquid cooling row, the liquid cooling row is provided with a liquid box, the liquid box is provided with a liquid inlet, a liquid outlet and a liquid injection port, the liquid outlet is lower than the liquid level, the liquid injection port is higher than the liquid level, a one-way valve is arranged between an inlet of the liquid cooling row and an inlet of the liquid box, a one-way valve is arranged between an outlet of the liquid cooling row and an outlet of the liquid box, and a one-way valve is arranged between an outlet of the liquid cooling row and an outlet of the liquid box. And the one-way valve is consistent with the cold liquid circulation direction.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid cooling radiators, and in particular to a liquid cooling radiator and a liquid cooling row thereof. Background Art

[0002] With the development of science and technology, the heat generation of cores such as CPUs and GPUs has become increasingly serious. Traditional air cooling is limited by its volume and weight and is difficult to dissipate heat effectively. Liquid cooling has emerged as the times require. Among them, split liquid cooling is difficult to promote effectively due to its complexity. Ultimately, integrated liquid cooling radiators have developed rapidly. However, they continue to use the old radiator suitable for split liquid cooling, without considering that the liquid pump head and flow rate of the current integrated liquid cooling radiator are significantly smaller than those of the split liquid cooling radiator. They are also not suitable for existing liquid cooling radiators that require large flow and high head, resulting in poor heat dissipation effect. Therefore, improvements are needed. The turbulent plate described in CN221283659U has a complex structure, high cost, and is difficult to install. The through holes are fine and easy to clog, and the large flow resistance requires high liquid pump head. At the same time, due to the limited internal volume of the integrated liquid cooling radiator, the evaporation of the cold liquid easily causes the liquid pump to take in air, which in turn makes the liquid pump unable to promote the circulation of the cold liquid. At this time, simply adding liquid to the integrated liquid cooling radiator and exhausting the liquid pump often require turning the entire chassis upside down or removing the liquid cooling radiator upside down and then reinstalling it, which is very time-consuming and labor-intensive. Therefore, improvements are needed. Summary of the Invention

[0003] The main purpose of this invention is to provide a liquid cooling radiator that is more suitable for low-flow, low-lift liquid pumps, further adapting to low-flow, low-lift liquid cooling systems. It also reduces the laminar flow in the radiator's heat pipes, which is inefficient due to heat dissipation away from the inner wall of the heat pipes, thereby improving the contact efficiency between the coolant and the heat pipe walls and improving heat dissipation efficiency.

[0004] To achieve the above-mentioned objectives, the present invention proposes a liquid cooling radiator, comprising a plurality of heat dissipation tubes connected in parallel, wherein a flow channel is provided inside the heat dissipation tube for circulating cold liquid, and the cross-sectional shape of the flow channel includes rectangular, oblong, elliptical, waist-shaped or circular. A placeholder strip is provided inside the heat dissipation tube, and the placeholder strip includes solid material, foamed material, capsule or filter cotton. The solid material includes metal, plastic or rubber, the foamed material includes foamed rubber or foam, and the capsule includes an air bag or a liquid bag. There is a gap between the placeholder strip and the inner wall of the heat dissipation tube for the circulation of cold liquid.

[0005] First, due to the laminar flow effect of liquid and the low flow rate and low head of the liquid pump in the integrated liquid cooling system suitable for this solution, the majority of the coolant in the heat pipes of existing liquid cooling radiators circulates in the central area of ​​the heat pipes, away from the inner wall of the heat pipes. This portion of the flow is very inefficient in terms of heat transfer. This solution, by providing spacers within the heat pipes, squeezes out this inefficient central channel, significantly reducing the proportion of the coolant flow that is inefficient compared to existing radiators. Second, this solution forces the coolant to flow closely to the inner wall of the heat pipes, significantly increasing the proportion of the flow that is efficient compared to existing radiators. Furthermore, by reducing the central flow area of ​​multiple heat pipes, this solution reduces the flow area of ​​each heat pipe. Driven by a low-flow, low-head liquid pump, the coolant can be more evenly distributed throughout the multiple heat pipes compared to existing radiators, avoiding the drawback of existing radiators where insufficient flow in some heat pipes due to low-flow liquid pumps results in a relatively reduced heat dissipation area and reduced heat dissipation efficiency.

[0006] Specifically, the cross-sectional area of ​​the spacer strip is larger than half of the cross-sectional area of ​​the flow channel outside of the spacer strip. By reducing the total flow area by at least half, and the reduction is all for inefficient heat dissipation, the laminar flow of inefficient heat dissipation in the flow channel is further limited, thereby increasing the overall proportion of flow for efficient heat dissipation.

[0007] Specifically, the placeholder strip is made of a flexible material, such as silicone, plastic, or acrylic. The flexible material oscillates freely when impacted by the coolant, causing the coolant to lose its stable laminar flow within the heat pipe, thereby generating more turbulent flow and improving heat transfer efficiency.

[0008] Specifically, the placeholder strip is provided with a limiting structure, which includes point-shaped protrusions or strip-shaped protrusions, so that the placeholder strip is fixed in the heat dissipation tube and the part outside the limiting structure is separated from the inner wall of the heat dissipation tube, forming a stable gap for the circulation of cooling liquid, thereby ensuring that more area of ​​the inner wall of the heat dissipation tube is separated from the placeholder strip and in contact with the cooling liquid, thereby improving the heat transfer efficiency.

[0009] Specifically, the spacer bar limiting structure is a rigid structure. After the spacer bar is installed in the heat pipe, the heat pipe is expanded by the limiting structure and has an interference fit with the fins on the outside of the heat pipe. After installation, the heat pipe can be expanded so that the heat pipe and the fins have an interference fit without adding low thermal conductivity solder for welding, and there is no restriction that the cross-section of the heat pipe must be circular. The wind resistance of the circular heat pipe is greater than that of the flat heat pipe, which further improves the heat dissipation efficiency.

[0010] A liquid-cooled radiator is proposed, comprising any one of the above-mentioned liquid-cooling radiators, wherein a liquid tank is provided on the liquid-cooling radiator, and the liquid tank is provided with a liquid inlet, a liquid outlet, and a liquid filling port, wherein the liquid outlet is below the liquid level, and the liquid filling port is above the liquid level, and the liquid tank is connected in series to the liquid path of the liquid-cooling radiator through the liquid inlet and the liquid outlet, and a one-way valve is connected in series in the liquid path of the liquid-cooling radiator, and the direction of the one-way valve is consistent with the circulation direction of the cold liquid. During the actual use of integrated water cooling, due to evaporation, the coolant gradually decreases, and the air in the liquid-cooled radiator gradually increases, resulting in an increasing frequency and degree of air intake in the liquid pump. Most liquid pumps are centrifugal pumps without self-priming ability. After the liquid pump is aired, it will lose its ability to pump the coolant. In the prior art, if the liquid-cooled radiator is not removed from the chassis, the entire chassis needs to be turned upside down, and removing the liquid-cooled radiator is very troublesome. The liquid-cooled radiator described in this solution is provided with a liquid tank, and a one-way valve is provided in front of or behind the liquid tank. After the liquid pump is aired, the liquid pump can be exhausted by pumping liquid from the liquid tank filling port, thereby easily restoring its ability to circulate coolant without the need to go to great lengths to turn the entire liquid cooling system upside down or disassemble and reinstall it.

[0011] Specifically, it includes a sensor and a vacuum pump. The sensor is connected to the outlet of the liquid pump, and the inlet of the vacuum pump is connected to the liquid injection port. The sensor detects the pressure at the outlet of the liquid pump. The vacuum pump is started and stopped according to the pressure measured by the sensor so that the pressure at the outlet of the liquid pump is maintained at 1~20kPa lower than the external pressure. If it is necessary to further strengthen the airtightness of the channel where the vacuum pump and the liquid injection port are located, a solenoid valve can be added to this channel to connect the liquid injection port, the vacuum pump, and the solenoid valve in series. The liquid cooling radiator described in this solution includes a vacuum pump, a sensor, and a solenoid valve. The sensor detects the pressure at the outlet of the liquid pump, and the vacuum pump extracts gas from the liquid tank as needed to control the pressure at the outlet of the liquid pump to always be slightly lower than the external atmospheric pressure. Since the highest pressure point in the entire circulating liquid circuit is the outlet of the liquid pump when the liquid pump circulates the cold liquid, keeping the pressure here lower than the external pressure can keep the entire liquid cooling system in a negative pressure environment to prevent leakage and minimize the acceleration of evaporation caused by pressure. Adding a spacer to the radiator increases the proportion of the liquid tank's volume to the total cooling system volume, reducing the volume of gas accumulated outside the tank and minimizing the impact of air outside the tank on the liquid level when the radiator's negative pressure changes. By installing a vacuum pump, the tank's air pumping and deflation cycle can be completed simply by intermittently controlling the connection between the tank and the outside air at the pump's air inlet, making it easier to vent the pump, increase or decrease the amount of coolant, and replace the coolant.

[0012] Specifically, the pressure at the liquid pump outlet is 3-10 kPa lower than the external pressure. By controlling the negative pressure intensity within 3-10 kPa, the acceleration of evaporation by negative pressure is minimized, the degree of negative pressure fluctuation is reduced, and the aging rate of the material is reduced.

[0013] Specifically, a solenoid valve is connected in series between the vacuum pump and the liquid injection port, or the liquid tank is provided with an air inlet, and the air inlet is provided with a second solenoid valve.

[0014] By setting a second solenoid valve, the liquid pump can be further automatically assisted in exhausting after the liquid pump is inhaled. The control panel controls the connection and blocking of the water tank to the outside air, and the vacuum pump's extraction and blocking of the water tank, to perform a fully automatic exhaust operation. The exhaust operation specifically controls the time-sharing conduction of the above two solenoid valves. When the solenoid valve connected to the vacuum pump is turned on, the vacuum pump extracts air from the water tank, and when the second solenoid valve is turned on, air is injected into the water tank, achieving the function of fully automatically exhausting the water pump and restoring the pumping function. The control panel can trigger the exhaust operation through a manual switch, or can determine whether the exhaust operation needs to be triggered by detecting the pressure difference before and after the water pump through a pressure differential sensor, detecting the cold liquid flow rate through a flow sensor, or detecting the temperature difference between the inside and outside of the cold head through a temperature differential sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 These are four preferred cross-sectional shapes of heat pipes and placeholder strips.

[0016] Figure 2 This is a preferred cross-sectional shape of the placeholder strip.

[0017] Figure 3 The figure is a schematic diagram of a preferred solution in which a heat pipe is expanded by a spacer bar and then has an interference fit with the fin.

[0018] Figure 4 It is an optimal integrated radiator with a liquid tank, a liquid pump, and a negative pressure device.

[0019] Reference numerals: 1- heat pipe cross section, 2- placeholder bar cross section, 21- placeholder bar protrusion, 3- heat sink fin, 4- fan, 5- radiator body, 6- liquid pump, 71- vacuum pump, 72- solenoid valve, 73- control board, 8- radiator inlet and outlet blocks, 81- liquid tank, 82- exhaust port, 83- liquid level observation window, 84- liquid filling port. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Figure 1 Four preferred cross-sectional shapes of heat pipes and four preferred cross-sectional shapes of placeholder strips are given as examples.

[0024] Figure 2 The preferred scheme of setting an oblong placeholder strip in an oblong heat dissipation tube is depicted, wherein the oblong placeholder strip 2 is provided with a placeholder strip protrusion 21, which is squeezed and fixed to the oblong heat dissipation tube 1, and ensures that a narrow gap for the circulation of cooling liquid is formed between the inner wall of most heat dissipation tubes and the placeholder strip.

[0025] Figure 3 This is a schematic diagram of a preferred method for expanding a heat pipe with a spacer strip and then achieving an interference fit with the fins. The heat sink 3 has pre-opened holes for the heat pipe 1 to pass through. These pre-opened holes are squeezed and slightly enlarged by the heat pipe 1 after expansion. Simultaneously, the heat sink 3 and heat pipe 1 form an interference fit, forming a stable heat transfer path. The heat pipe 1 can be expanded using a separate expansion head and then installed with the spacer strip 2 to prevent it from separating from the fins after shrinkage. Alternatively, the expansion of the heat pipe 1 can be achieved simultaneously with the installation of the spacer strip 2 into the heat pipe.

[0026] Figure 4It is a preferred integrated radiator with a liquid tank, a liquid pump, and a negative pressure device. The radiator body 5 includes a heat dissipation pipe, the heat dissipation pipe is connected to a fin on the outside, and a placeholder strip is provided inside the heat dissipation pipe. The heat dissipation pipe is divided into two groups. One end of the heat dissipation pipe of the first group close to the liquid pump 6 is connected to the liquid inlet of the liquid tank 81, and the other end is connected to one end of the heat dissipation pipe of the second group. The other end of the heat dissipation pipe of the second group is connected to the liquid inlet of the radiator. The liquid outlet of the liquid tank 81 is lower than the liquid level and is connected to the liquid inlet of the liquid pump 6. The liquid outlet of the liquid pump 6 is connected to the liquid outlet of the radiator. The liquid tank 81 is provided with an exhaust port 82, which is connected to the solenoid valve 72, which is in turn connected to the vacuum pump 71. A pressure sensor is provided on the control panel 73, which is connected to the liquid pump outlet to detect pressure. The control panel 73 controls the start and stop of the solenoid valve 72 and the vacuum pump 71 based on the pressure measured by the pressure sensor, maintaining the pressure at the liquid pump outlet 3-10 kPa lower than the ambient pressure. The liquid tank 81 is also provided with an observation window 83 for observing the liquid level within the tank and a liquid filling port 84 for convenient filling and draining. The exhaust port 82, observation window 83, and liquid filling port 84 may be combined. The liquid inlet and outlet of the liquid tank 81 are both equipped with one-way valves in the same direction as the cold liquid circulation. When the liquid pump is unable to circulate the cold liquid due to air intake, the vacuum pump will maintain a negative pressure environment in the liquid tank. Therefore, opening the liquid filling port or observation window will allow outside air to enter the liquid tank, causing the pressure to increase. After the pressure increases, the liquid filling port or observation window will be closed again, and the pressure in the liquid tank will drop due to the vacuum pump pumping air. The process of back and forth pressure changes in the liquid tank causes the cold liquid to circulate in the original circulation direction under the action of the one-way valve and the air outside the liquid tank in the liquid cooling radiator, pushing the air in the liquid pump out of the liquid pump, allowing the liquid pump to resume its ability to circulate the cold liquid. After a second solenoid valve is provided to connect to the liquid filling port or observation window and the second solenoid valve is connected to the control board, the control board can control the opening and closing of the second solenoid valve, so that the opening and closing of the liquid filling port or observation window in the above process does not require human intervention.

[0027] Preferably, the liquid pump may be arranged on a water pipe or a cold head instead of on the radiator.

[0028] Preferably, when the inner wall of the heat dissipation tube is engraved with a groove, the placeholder strip completely blocks the flow area outside the groove after being installed in the round tube, so that only the groove in the heat dissipation tube can flow cold liquid, further improving the heat exchange efficiency between the cold liquid and the heat dissipation tube.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid cooling radiator comprising a plurality of heat dissipation tubes arranged in parallel in the same direction, wherein a flow channel is provided inside the heat dissipation tube for circulating a cooling liquid, wherein the cross-sectional shape of the flow channel includes a rectangular, oblong, elliptical, circular, or waist-shaped shape, and wherein: A placeholder strip is provided in the heat dissipation pipe, and the placeholder strip includes solid material, foamed material, capsule or filter cotton. The solid material includes metal, plastic or rubber, the foamed material includes foamed rubber or foam, and the capsule includes an air bag or a liquid bag. There is a gap between the placeholder strip and the inner wall of the heat dissipation pipe for the circulation of cooling liquid.

2. The liquid cooling radiator according to claim 1, characterized in that: The cross-sectional area of ​​the placeholder strip is larger than half of the flow cross-sectional area of ​​the flow channel outside the placeholder strip.

3. The liquid cooling radiator according to claim 1, characterized in that: The placeholder strip is made of a flexible material, which includes silicone, plastic, or acrylic soft glue.

4. The liquid cooling radiator according to claim 1, characterized in that: The placeholder strip is provided with a limiting structure, which includes point-shaped protrusions or strip-shaped protrusions, so that the placeholder strip is fixed in the heat dissipation tube and the part outside the limiting structure is separated from the inner wall of the heat dissipation tube, forming a gap for the circulation of cooling liquid.

5. The liquid cooling radiator according to claim 1, characterized in that: The spacer bar limiting structure is a rigid structure. After the spacer bar is installed in the heat dissipation pipe, the heat dissipation pipe is expanded by the limiting structure and has an interference fit with the fins on the outside of the heat dissipation pipe.

6. The liquid cooling radiator according to claim 1, characterized in that: The thermal expansion ratio of the placeholder strip is greater than that of the heat dissipation pipe.

7. A liquid cooling radiator, comprising the liquid cooling radiator according to any one of claims 1 to 6, characterized in that: The liquid cooling row is provided with a liquid tank, and the liquid tank is provided with a liquid inlet, a liquid outlet, and a liquid injection port. The liquid outlet is lower than the liquid level, and the liquid injection port is higher than the liquid level. The liquid tank is connected in series to the liquid path of the liquid cooling row through the liquid inlet and the liquid outlet. A one-way valve is connected in series in the liquid cooling row liquid path, and the direction of the one-way valve is consistent with the circulation direction of the cold liquid.

8. The liquid cooling radiator according to claim 7, characterized in that: It includes a sensor and a vacuum pump. The sensor is connected to the liquid pump outlet, and the vacuum pump inlet is connected to the liquid injection port. The sensor detects the pressure at the liquid pump outlet. The vacuum pump is started and stopped according to the pressure measured by the sensor so that the pressure at the liquid pump outlet is maintained 1~20kPa lower than the external pressure.

9. The liquid cooling radiator according to claim 7, characterized in that: The pressure at the outlet of the liquid pump is 3-10 kPa lower than the external pressure.

10. The liquid cooling radiator according to claim 7, characterized in that: A solenoid valve is connected in series between the vacuum pump and the liquid injection port, or the liquid tank is provided with an air inlet, and the air inlet is provided with a second solenoid valve.

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