Liquid leakage detection method for liquid cooling server

Abstract

The invention relates to the technical field of liquid leakage detection of liquid cooling servers, in particular to a liquid leakage detection method of a liquid cooling server, which comprises the following steps: using a specially-made soft optical fiber or glass fiber as a detection signal line for detection, coating a light shielding layer on the surface of an optical signal line, arranging light detection IC lines at incident light and emergent light, and detecting the liquid leakage of the liquid cooling server when liquid leakage occurs. When the abnormal emergent light is detected, the cooling liquid drips on the detection light signal line and reacts with a light shielding layer on the light signal line, so that part of light leaks out of the signal line, and the luminous flux phi'of the detected abnormal emergent light is smaller than the numerical value phi 'of the luminous flux of the emergent light in a normal state due to the leakage of part of light in the middle at the moment; the obtained abnormal light transmittance tau is equal to phi ' / phi, tau, lt, tau is obtained, it is judged that the light leaks, namely, the problem of liquid leakage exists at the moment, and then server operation and maintenance personnel are informed in an alarm mode. The problems that additive components in an existing giant salamander drink are complex and not healthy enough are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid leakage detection for liquid cooling servers, and in particular to a method for liquid leakage detection for liquid cooling servers. Background Art

[0002] With the rapid development of the Internet, servers have attracted more and more attention. Major Internet manufacturers have increased the number of servers they own. As the number of servers increases, energy consumption issues have received more and more attention. Among them, how to reduce the proportion of energy consumption for heat dissipation has become a difficult problem for major server manufacturers. Liquid cooling has received more and more attention due to its advantages of low energy consumption and good heat dissipation effect. Among them, the reliability of liquid cooling coolant has become the primary technical problem.

[0003] The current solution is a liquid leakage detection line that is wrapped around the water inlet and outlet pipes. This solution uses the change in the detection level signal to determine whether there is a leak in the liquid cooling pipe. Because the interior of the server is a gathering place for electromagnetic fields, it has a greater impact on the electrical signal of the liquid leakage detection cable, and it is easy to have no detection alarm, resulting in low reliability of this solution. Optical signals are less affected by electromagnetic interference and have high reliability. This patent proposes using optical signals as a reference for detection to detect liquid leaks, which improves the accuracy of liquid leak detection and the reliability of the liquid cooling system.

[0004] The existing leakage detection scheme uses the change of the electrical signal of the detection signal line to determine whether there is a leakage problem in the liquid cooling pipe. Since the leakage detection line is wrapped inside the server and the surrounding areas are areas with severe electromagnetic interference, it is very easy to be interfered and prone to false alarms. Because the server needs to improve the efficiency of leakage detection fault detection and reduce the reliability of the server's stable operation due to the reduction of the heat dissipation capacity caused by the leakage of coolant, the detection frequency of the leakage detection is currently set high. Therefore, when the leakage detection line is in an electromagnetic field environment, if there is a high-frequency change in the surrounding electromagnetic field, it will induce the detection signal line to generate an induced current, resulting in abnormal voltage detection, resulting in false alarms of leakage detection, and reducing the reliability of leakage detection. In addition, since the electrical signal is greatly affected by the electromagnetic field, the layout of the detection circuit on the motherboard is relatively limited, and the principle inductor, that is, the power MOS with a high switching frequency, is required. The layout and wiring requirements for the leakage circuit are high. Since there are a large number of inductors and power MOS with high-frequency switches on the motherboard, the leakage detection circuit cannot be completely avoided, so it is inevitable that the electromagnetic interference is received, resulting in false triggering of the signal. Summary of the invention

[0005] The present invention aims to study a method for determining the integrity of an optical channel of a detection circuit and determining whether a cooling pipeline has a leakage problem by detecting changes in the luminous flux of incident light and outgoing light.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is a method for detecting liquid leakage of a liquid-cooled server, including using a special soft optical fiber or glass fiber as a detection signal line suitable for detection, coating a light-shielding layer on the surface of the optical signal line, and the light-shielding layer has a high total reflection ability, which ensures the integrity of the optical signal inside the optical signal line, that is, the loss of the outgoing light is minimized, and the luminous flux of the outgoing light is close to the luminous flux of the incident light. In addition, the light-shielding layer needs to add certain chemical elements, which can react with the coolant, and can reduce or destroy the light isolation ability of the light-shielding layer, thereby causing light leakage of the detection signal line, but it is necessary to ensure that the coolant and the light-shielding layer are non-corrosive to prevent other damage. A light detection IC circuit is set at the incident light and the outgoing light, and the luminous flux Φ' of the incident light and the luminous flux Φ' of the outgoing light can be detected in real time, and the light transmittance τ=Φ' / Φ can be calculated. When the cooling pipeline is working normally, τ is a stable value.

[0007] When leakage occurs, the coolant will drip onto the detection optical signal line and react with the light-shielding layer on the optical signal line, weakening or destroying the effect of the light-shielding layer, causing part of the light to leak out of the signal line. The degree of light leakage is strongly correlated with the severity of the leakage, that is, the more serious the leakage, the more serious the light-shielding layer is damaged, and the more serious the light leakage is. At this time, the luminous flux Φ' of the abnormal outgoing light detected will be smaller than the value Φ' of the luminous flux of the outgoing light in the normal state due to the leakage of part of the light in the middle. The more serious the leakage, the greater the difference between the luminous flux of the outgoing light and the normal state; at this time, the abnormal light transmittance τ,=Φ', / Φ, it can be seen that τ,<τ, it is judged that the light has leaked, that is, there is a leakage problem at this time, and then the server operation and maintenance personnel are notified in the form of an alarm to deal with the abnormality in time.

[0008] Compared with the prior art, the advantages of the present invention are as follows: the present invention proposes a leakage detection scheme by detecting optical signals, which solves the defect that the electrical signal leakage detection scheme is easily interfered by electromagnetic fields, improves the accuracy of leakage detection, and further improves the reliability and stability of server operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0010] Figure 1 This is a schematic diagram of an optical signal leakage detection scheme in a method for detecting leakage in a liquid-cooled server according to the present invention.

[0011] Figure 2 This is a schematic diagram of an original leakage detection scheme in a method for detecting leakage in a liquid-cooled server of the present invention.

[0012] Figure 3 This is a schematic diagram of the leakage detection principle of the original scheme in a method for detecting leakage of a liquid-cooled server according to the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] The present invention provides a technical solution to solve the existing problems raised in the background technology.

[0015] In the prior art, Figure 2 , Figure 3 As shown in the figure, the leakage detection scheme of server liquid cooling is to determine whether there is leakage in the cooling pipe by detecting the change of the electrical signal of the leakage detection line wrapped around the water inlet pipe and the water outlet pipe. Two red and blue signal detection lines will be wrapped around the cooling pipe at the same time (the color is only used for example and is not necessary). Note that the red and blue signal lines are isolated from each other. The blue detection line is grounded on both sides of the water inlet pipe and the water outlet pipe to ensure that the level of the blue signal line is always low. The red detection line is pulled up by resistor R1 at the water inlet pipe using a high level, and the red detection line is FLOAT (suspended) at the water outlet pipe. Then the level detection IC will detect the level change of the red signal line. Since the red and blue detection lines are isolated, the detection level is non-zero when there is no leakage. When there is leakage somewhere in the outlet pipe or the inlet pipe, the coolant has a certain conductivity. When the coolant leaks to a certain extent, the red and blue signal lines will be short-circuited together. Since the blue signal line is grounded, the red signal line is also short-circuited to the ground after a short circuit occurs. At this time, the level detection of the red signal line is 0. Therefore, by detecting the change in level, it can be determined whether there is a leakage problem in the liquid cooling pipe of the server.

[0016] However, since the leakage detection line is wound inside the server, the surrounding area is an area with severe electromagnetic interference, which is very susceptible to interference and prone to false alarms. Figure 2As shown, because the server needs to improve the efficiency of leakage detection fault detection and reduce the reliability of stable operation of the server due to the reduction of heat dissipation capacity caused by coolant leakage, the detection frequency of leakage detection is currently set relatively high. Therefore, when the leakage detection line is in an electromagnetic field environment, if there is a high-frequency change in the surrounding electromagnetic field, it will induce the detection signal line to generate an induced current, resulting in abnormal voltage detection, resulting in false alarm of leakage detection, and reducing the reliability of leakage detection. In addition, since the electrical signal is greatly affected by the electromagnetic field, the layout of the detection circuit on the motherboard is relatively limited, and the principle inductor, that is, the power MOS with a higher switching frequency, is required. The layout and wiring requirements for the leakage circuit are relatively high. Since there are many inductors and power MOS with high-frequency switches on the motherboard, the leakage detection circuit cannot be completely avoided, so it is inevitable that the electromagnetic interference will cause the false triggering of the signal.

[0017] Example 1

[0018] The working principle of the present invention is: by detecting the change in the luminous flux of the incident light and the outgoing light, the integrity of the optical channel of the detection circuit is judged to determine whether there is a leakage problem in the cooling pipeline. If there is a leakage problem in the cooling pipeline in the middle, the luminous flux of the outgoing light of the detection signal will inevitably decrease; the optical signal is almost not affected by the electromagnetic field, so by detecting the change in the optical signal, the reliability and stability are high compared to the electrical signal of the original scheme. In addition, for the leakage detection circuit, the optical signal detection scheme is not affected by the electromagnetic field. The leakage detection circuit does not need to deliberately avoid the inductor and high-frequency switch MOS. The layout on the motherboard is more flexible and not affected by the electromagnetic field.

[0019] like Figure 3 As shown, the light detection IC can detect the luminous flux of the incident light and the outgoing light, calculate the light transmittance, compare the real-time changes of the luminous flux of the incident light and the outgoing light, detect the luminous flux of the incident light Φ' and the luminous flux of the outgoing light Φ', and calculate the light transmittance τ=Φ' / Φ. When the cooling pipe works normally, τ is a stable value. When leakage occurs, there is leakage of the light signal. At this time, the abnormal outgoing light flux Φ' detected will be smaller than the value of the outgoing light flux in the normal state Φ' due to the leakage of light in the middle. At this time, the abnormal light transmittance τ,=Φ' / Φ, and it can be seen that τ,<τ, judging that light leakage has occurred, that is, there is a leakage problem at this time. When the outgoing light flux is reduced due to leakage, this change can be detected in real time. The light detection IC will report the abnormality in time and notify the server operation and maintenance personnel to deal with the leakage abnormality as soon as possible to prevent the server from overheating due to leakage.

[0020] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for detecting liquid leakage in a liquid-cooled server, characterized in that: This includes using a specially made soft optical fiber or glass fiber as a detection signal line suitable for detection, coating a light-shielding layer on the surface of the optical signal line, the light-shielding layer has a high total reflection capability, and ensures the integrity of the optical signal inside the optical signal line, that is, the loss of the outgoing light is reduced to the maximum extent, and the luminous flux of the outgoing light is close to the luminous flux of the incident light; By setting up a light detection IC circuit at the incident light and the outgoing light, the luminous flux Φ' of the incident light and the luminous flux Φ' of the outgoing light can be detected in real time. The light transmittance τ = Φ' / Φ can be calculated. When the cooling pipe is working normally, τ is a stable value. When leakage occurs, the coolant will drip onto the detection optical signal line and react with the light-shielding layer on the optical signal line, weakening or destroying the effect of the light-shielding layer, causing part of the light to leak out of the signal line. The degree of light leakage is strongly correlated with the severity of the leakage, that is, the more serious the leakage, the more serious the light-shielding layer is damaged, and thus the more serious the light leakage is. At this time, the luminous flux Φ' of the abnormal outgoing light detected will be smaller than the luminous flux Φ' of the outgoing light in the normal state due to the leakage of part of the light in the middle. The more serious the leakage is, the greater the difference between the luminous flux of the outgoing light and the normal one. At this time, the abnormal light transmittance τ,=Φ' / Φ, it can be seen that τ,<τ, it is judged that the light has leaked, that is, there is a leakage problem at this time, and then the server operation and maintenance personnel are notified in the form of an alarm to deal with the abnormality in time.

2. A method for detecting liquid leakage in a liquid-cooled server according to claim 1, characterized in that: The light-shielding layer needs to be added with certain chemical elements, which can react with the coolant to reduce or destroy the light isolation ability of the light-shielding layer, thereby causing light leakage of the detection signal line. However, it is necessary to ensure that the coolant and the light-shielding layer are non-corrosive to prevent other damage.

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