Liquid leakage detection device, liquid leakage detection method and liquid cooling system

Abstract

The invention relates to the technical field of liquid leakage detection, and particularly discloses a liquid leakage detection device, a liquid leakage detection method and a liquid cooling system. The liquid leakage detection device comprises a radio frequency tag, a first liquid absorption layer and a humidity sensor. The radio frequency tag can reflect a signal when encountering liquid, and the signal intensity can be changed; the first liquid absorption layer is arranged on the surface of the radio frequency tag and is used for absorbing liquid to enable the radio frequency tag to be in contact with the liquid; the humidity sensor is used for detecting humidity, and when the intensity of the liquid reflection signal of the radio frequency tag changes, the humidity detected by the humidity sensor is larger than the preset humidity. According to the liquid leakage detection device and the liquid leakage detection method provided by the invention, the humidity sensor and the radio frequency tag are combined to reflect whether liquid leakage occurs, so that the liquid leakage detection accuracy caused by abnormal signal strength when the radio frequency tag is interfered and the error caused by the detection precision problem of the humidity sensor can be avoided; and the accuracy and precision of liquid leakage detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid leakage detection, and more specifically, to a liquid leakage detection device, a liquid leakage detection method and a liquid cooling system. Background Art

[0002] Liquid transmission through pipelines is widely used in various scenarios, but there are common leakage problems caused by wear, corrosion or pressure in pipelines or pipeline joints. For server liquid cooling, semiconductor equipment liquid transmission or other scenarios with high requirements for leakage, it is necessary to perform leakage detection. At present, common leakage detection methods include leakage detection cables, fixed-point leakage detection sensors, etc.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art:

[0004] Existing leakage detection devices are all wired detection. The number of cold plate pipes and joints in server liquid cooling scenarios is increasing, and the demand for leakage detection is becoming more and more complex. The corresponding wired detection circuits are complex, bloated in size, and cumbersome to install. In addition, the detection device will be stressed during installation and maintenance, which may cause the circuit to break. Therefore, conventional wired leakage detection devices are difficult to adapt to leakage detection in complex scenarios such as server liquid cooling. Although wireless detection can be achieved by using the method that the signal strength of radio frequency identification is affected by liquid, it cannot detect small amounts of leakage. The leakage detection volume is generally above 20mL, and temperature, humidity, and signal interference all affect the detection accuracy. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a liquid leakage detection device, a liquid leakage detection method and a liquid cooling system, which can effectively solve the problem of low precision and accuracy of liquid leakage detection using radio frequency identification.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A liquid leakage detection device, comprising:

[0008] A radio frequency tag, wherein the radio frequency tag is capable of reflecting a signal and the signal strength changes when encountering liquid;

[0009] A first liquid absorbing layer, disposed on the surface of the radio frequency tag, for absorbing liquid so that the radio frequency tag is in contact with the liquid;

[0010] The humidity sensor is used to detect humidity, and when the intensity of the reflected signal of the radio frequency tag encountering liquid changes, the humidity detected by the humidity sensor is greater than the preset humidity.

[0011] Optionally, the above-mentioned liquid leakage detection device also includes a second liquid absorbing layer for absorbing liquid, the first liquid absorbing layer is arranged on the first side surface of the radio frequency tag, and the second liquid absorbing layer is arranged on the second side surface of the radio frequency tag, and the second side surface is opposite to the first side surface.

[0012] Optionally, in the above-mentioned liquid leakage detection device, the first liquid absorbing layer and / or the second liquid absorbing layer is a humidity-sensitive material, and the dielectric constant of the humidity-sensitive material changes in a liquid-absorbing state.

[0013] Optionally, in the above-mentioned liquid leakage detection device, the first liquid absorbing layer is a porous sponge layer or a modified polymer liquid absorbing fiber woven layer;

[0014] And / or the second liquid-absorbing layer is a porous sponge layer or a modified polymer liquid-absorbing fiber woven layer.

[0015] Optionally, the above-mentioned liquid leakage detection device further includes an adhesive layer, which forms a side surface of the liquid leakage detection device and is located on a side of the radio frequency tag where the humidity sensor is provided.

[0016] Optionally, the above-mentioned liquid leakage detection device further includes a first absorbing material layer and / or a second absorbing material layer, the first absorbing material layer is arranged on a surface of the first liquid absorbing layer facing away from the radio frequency tag, and the second absorbing material layer is arranged on a side of the radio frequency tag facing away from the first liquid absorbing layer.

[0017] Optionally, in the above-mentioned liquid leakage detection device, the frequency range of the radio frequency tag is 860~960MHz or 2.45GHz;

[0018] Optionally, in the above-mentioned liquid leakage detection device, the humidity sensor is detachably provided on the radio frequency tag.

[0019] In order to achieve the above object, the present invention also provides the following technical solutions:

[0020] A liquid leakage detection method, used in any of the above-mentioned liquid leakage detection devices, comprising:

[0021] Acquire the intensity of the reflected signal of the radio frequency tag and the humidity detected by the humidity sensor;

[0022] When the intensity of the reflected signal of the radio frequency tag changes and the humidity detected by the humidity sensor is greater than the preset humidity, it is determined that leakage occurs at the position corresponding to the leakage detection device.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects: the liquid leakage detection device and the liquid leakage detection method provided by the present invention are applied to detect liquid leakage by utilizing the characteristic that the intensity of the reflected signal of the radio frequency tag is affected by the liquid. It can realize wireless liquid leakage detection, thus being able to adapt to the liquid leakage detection of complex series-parallel pipelines and joints, and has low installation requirements for liquid cooling components and low cost.

[0024] At the same time, in this application, by integrating a humidity sensor on the RFID tag, the humidity sensor can detect the moisture content in the environment. When the intensity of the reflected signal of the RFID tag changes and the humidity detected by the humidity sensor is greater than the preset humidity, it indicates that a leakage occurs at the location where the leakage detection device is set. That is, the humidity sensor and the RFID tag are combined to reflect whether there is a leakage, which can avoid the abnormal signal strength when the RFID tag is interfered, which affects the accuracy of the leakage detection, and the error caused by the detection accuracy of the humidity sensor, thereby improving the accuracy and precision of the leakage detection.

[0025] In addition, by setting the first liquid absorbing layer on the surface of the radio frequency tag, on the one hand, even if a small amount of liquid leakage occurs, since the first liquid absorbing layer can absorb the leaked liquid, the radio frequency tag can also contact the leaked liquid to change the intensity of its reflected signal, so that even a small amount of liquid leakage can be accurately detected, further improving the accuracy of liquid leakage detection. On the other hand, by absorbing the leaked liquid by the first liquid absorbing layer, the impact of the leak on the liquid cooling system and other scenes can be reduced, that is, the liquid leakage detection device can not only realize the liquid leakage detection, but also play a certain role in collecting the leaked liquid.

[0026] In order to achieve the above object, the present invention further provides a liquid cooling system, which includes any of the above leakage detection devices. Since the above leakage detection device has the above technical effects, the liquid cooling system having the leakage detection device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional schematic diagram of the installation state of a liquid leakage detection device according to a specific embodiment of the present invention;

[0029] Figure 2 is a cross-sectional schematic diagram of another liquid leakage detection device in an installed state;

[0030] Figure 3 It is a schematic diagram of the structure of a radio frequency tag;

[0031] Figure 4 It is a partial schematic diagram of the liquid cooling system;

[0032] Figure 5 for Figure 4 A partial enlarged schematic diagram of .

[0033] Reference numerals:

[0034] 1- RFID tag; 2- first liquid absorbing layer; 3- humidity sensor; 4- second liquid absorbing layer; 5- first absorbing material layer; 6- second absorbing material layer; 7- adhesive layer;

[0035] 11- Antenna;

[0036] 10-liquid leakage detection device; 20-liquid cooling pipe; 30-connector; 40-housing. DETAILED DESCRIPTION

[0037] The embodiments of the present invention disclose a liquid leakage detection device, a liquid leakage detection method and a liquid cooling system to improve the precision and accuracy of liquid leakage detection.

[0038] 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.

[0039] The liquid leakage detection device, liquid leakage detection method and liquid cooling system provided by the present application are applicable to but not limited to servers. In the following embodiments, the liquid leakage detection device and liquid leakage detection method are used for liquid leakage detection of a liquid cooling system of a server as an example for description.

[0040] The liquid leakage detection device is used to be installed in a position where liquid leakage detection is required, such as a liquid cooling system of a server. It is used in a liquid leakage detection system, which includes the liquid leakage detection device and a radio frequency identification reader and writer and a data processing system that cooperate with it.

[0041] The leakage detection device uses wireless radio frequency identification technology to detect leakage. Wireless radio frequency identification (Radio Frequency Identification, hereinafter referred to as RFID) is a communication technology that can identify specific targets and read and write related data through radio signals without the need to establish mechanical or optical contact between the identification system and the specific target. RFID tags, or radio frequency tags, include coupling elements and chips. Each RFID tag has a unique electronic code and is attached to an object to identify the target object. In industrial environment leakage detection, the received signal strength indication (Received Signal Strength Indication, hereinafter referred to as RSSI) and phase value of the RFID tag remain stable before the leakage; after the leakage, the RFID tag contacts the leaking liquid, which causes the received signal strength RSSI indicator to decrease, and the phase value decreases monotonically.

[0042] The RFID tag cooperates with the RFID reader and the data processing system processes the information of the RFID reader. For example, the RFID reader is used to transmit and receive signals to the RFID tag, and the data processing system is used to process the information read and written by the RFID into humidity information or liquid leakage information, and feed the information back to the server motherboard. Since the data processing function is relatively simple, the data processing system can be integrated into the RFID reader.

[0043] The RFID reader is placed inside the server. Depending on the layout of the server's liquid cooling components (the liquid cooling pipes and manifolds are in different locations, sometimes with spatial isolation), as well as the internal electromagnetic interference requirements of the server, the RFID transmission power is relatively low, and the RFID signal transmission and reception angles are generally within 120°. There can be one or more RFID readers, which are located below or to the side of the liquid cooling pipes, manifolds and other structures, with their reader antennas facing the RFID tag, so that the signal emitted by the RFID reader will not be directed toward the motherboard, which can avoid interference with the motherboard or other electrical components.

[0044] In the following embodiments, the liquid leakage detection device provided with a radio frequency tag is mainly described.

[0045] In some embodiments, see Figure 1-Figure 2 The leakage detection device provided by the present invention comprises a radio frequency tag 1, a first liquid absorbing layer 2 and a humidity sensor 3. The radio frequency tag 1 can reflect signals, and the humidity sensor 3 is used to detect humidity. For example, please refer to Figure 3, the radio frequency tag 1 is a thin sheet of rectangular, circular or other shapes, with an antenna 11 and other auxiliary circuits inside, and a humidity sensor chip is arranged on the radio frequency tag 1. When the radio frequency tag 1 encounters liquid, the radio frequency tag 1 can reflect the signal and the signal strength will change, and the humidity detected by the humidity sensor 3 is greater than the preset humidity. The size of the preset humidity can be set specifically as needed. For example, the preset humidity is 98%RH. The first liquid-absorbing layer 2 is arranged on the surface of the radio frequency tag 1 to absorb liquid so that the radio frequency tag 1 is in contact with the liquid. It can be understood that the first liquid-absorbing layer 2 can be arranged on the side surface of the radio frequency tag 1 where the humidity sensor 3 is arranged, or on the other side surface opposite to the humidity sensor 3. For example, the first liquid-absorbing layer 2 covers the surface of the radio frequency tag 1. When there is no leakage, the humidity sensor 3 can detect the ambient humidity, that is, the leakage detection device feeds back the air humidity in the area where it is located. When leakage occurs, the liquid flows to the first liquid-absorbing layer 2 and is absorbed, the radio frequency tag 1 contacts the liquid, the signal strength of its reflection changes, and the humidity detected by the humidity sensor 3 is greater than the preset humidity. Therefore, when the RSSI decreases and the humidity in the air is detected to be above 98%RH, it indicates that leakage has occurred.

[0046] The liquid leakage detection device provided by the present invention uses the characteristic that the intensity of the reflected signal of the radio frequency tag 1 is affected by the liquid to detect the liquid leakage. It can realize wireless liquid leakage detection, thus being able to adapt to the liquid leakage detection of complex series-parallel pipelines and joints, and has low installation requirements for liquid cooling components and low cost.

[0047] At the same time, in the present application, by integrating the humidity sensor 3 on the radio frequency tag 1, the humidity sensor 3 can detect the moisture content in the environment. When the intensity of the reflected signal of the radio frequency tag 1 changes and the humidity detected by the humidity sensor 3 is greater than the preset humidity, it indicates that a leakage occurs at the location where the leakage detection device is set. That is, the humidity sensor 3 is combined with the radio frequency tag 1 to reflect whether there is a leakage, which can avoid the abnormal signal strength when the radio frequency tag 1 is interfered, thereby avoiding the error caused by the detection accuracy of the humidity sensor 3, thereby improving the accuracy and precision of the leakage detection.

[0048] In addition, by providing the first liquid absorbing layer 2 on the surface of the radio frequency tag 1, on the one hand, even if a small amount of liquid leakage occurs, since the first liquid absorbing layer 2 can absorb the leaked liquid, the radio frequency tag 1 can also contact the leaked liquid to change the intensity of its reflected signal, so that even a small amount of liquid leakage can be accurately detected, further improving the accuracy of liquid leakage detection. On the other hand, by absorbing the leaked liquid through the first liquid absorbing layer 2, the impact of the leak on the liquid cooling system and other scenes can be reduced, that is, the liquid leakage detection device can not only realize the liquid leakage detection, but also play a certain role in collecting the leaked liquid.

[0049] In some embodiments, the humidity sensor 3 is a wireless humidity sensor, and the entire liquid leakage detection device can achieve wireless detection, which is convenient for installation in locations where liquid leakage detection is required, such as liquid cooling systems.

[0050] In some embodiments, the leakage detection device further includes a second liquid absorbing layer 4 for absorbing liquid, the first liquid absorbing layer 2 is arranged on the first side surface of the radio frequency tag 1, and the second liquid absorbing layer 4 is arranged on the second side surface of the radio frequency tag 1, and the second side surface is opposite to the first side surface. By respectively arranging the first liquid absorbing layer 2 and the second liquid absorbing layer 4 on the two side surfaces of the radio frequency tag 1, when leakage occurs, the leakage can be better absorbed, and even a trace amount of leakage can be effectively absorbed, thereby improving the detection accuracy. Exemplarily, the first liquid absorbing layer 2 and the second liquid absorbing layer 4 cover the first side surface and the second side surface of the radio frequency tag 1 respectively. Figure 1 and Figure 2 In the embodiment, the second side surface of the RFID tag 1 is a side surface of the RFID tag 1 provided with the humidity sensor 3, and the first side surface is a side surface of the RFID tag 1 facing away from the humidity sensor 3. In other embodiments, the positions of the first side surface and the second side surface may also be interchanged.

[0051] In some embodiments, the first liquid absorbing layer 2 and / or the second liquid absorbing layer 4 are hygroscopic materials, and the dielectric constant of the hygroscopic materials changes when absorbing liquid. In one example, the first liquid absorbing layer 2 or the second liquid absorbing layer 4 is a hygroscopic material; in another example, the first liquid absorbing layer 2 and the second liquid absorbing layer 4 are both hygroscopic materials. By setting the hygroscopic material on the first side surface and / or the second side surface of the radio frequency tag 1, the hygroscopic material itself has a small dielectric constant. When the hygroscopic material absorbs moisture in the air, the dielectric constant of the hygroscopic material increases due to the large dielectric constant of water. Therefore, when leakage occurs, the hygroscopic material absorbs the leakage, and the dielectric constant increases, causing the resonant frequency of the signal transmitted by the reader to the radio frequency tag 1 to change during reflection. Generally, the greater the humidity, the higher the resonant frequency. Therefore, the humidity can be identified by changing the signal resonant frequency and the signal strength, and the leakage (humidity 100%RH) can also be identified. Exemplarily, the hygroscopic material is PVA (polyvinyl alcohol) or PI (polyimide).

[0052] Furthermore, the signal frequency used by the radio frequency tag 1 is in the range of 1-5 GHz. The change of the resonance frequency in this frequency range has a greater impact, so the leakage detection accuracy is higher.

[0053] In some embodiments, the first liquid absorbent layer 2 is a porous sponge layer or a modified polymer absorbent fiber woven layer. In other embodiments, the second liquid absorbent layer 4 is a porous sponge layer or a modified polymer absorbent fiber woven layer. In still other embodiments, the first liquid absorbent layer 2 is a porous sponge layer or a modified polymer absorbent fiber woven layer, and the second liquid absorbent layer 4 is a porous sponge layer or a modified polymer absorbent fiber woven layer. The second liquid absorbent layer 4 is a porous sponge layer or a modified polymer absorbent fiber woven layer. The porous sponge material or the modified polymer absorbent fiber woven structure can contact the air through the holes in the material when there is no leakage, and does not affect the humidity detection function of the humidity sensor 3; when there is leakage, it uses physical adsorption to quickly adsorb the leaked liquid to the surface of the humidity sensor 3, so that the leakage detection is more sensitive.

[0054] In some embodiments, the thickness of the first absorbent layer 2 is in the range of 0.5-2 mm, preferably 0.8-1.5 mm, and illustratively, the thickness of the first absorbent layer 2 is 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.9 mm or 2 mm. The thickness of the second absorbent layer 4 is in the range of 0.5-2 mm, preferably 0.8-1.5 mm, and illustratively, the thickness of the second absorbent layer 4 is 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.9 mm or 2 mm. The thickness of the first absorbent layer 2 and the second absorbent layer 4 is set as above, which can ensure the absorption of leaked liquid and avoid occupying too much space in the thickness direction.

[0055] In some embodiments, the liquid leakage detection device further comprises an adhesive layer 7, which forms a side surface of the liquid leakage detection device and is located on the side of the radio frequency tag 1 where the humidity sensor 3 is provided. The radio frequency tag 1 has a certain flexibility and can be installed by bonding. The adhesive layer 7 is used as the surface of the liquid leakage detection device, so that it is convenient to install it at a position where liquid leakage detection is required. And the adhesive layer 7 is located on the side of the radio frequency tag 1 where the humidity sensor 3 is provided. It can be understood that when the side of the radio frequency tag 1 where the humidity sensor 3 is provided is provided with the first liquid absorbing layer 2 or the second liquid absorbing layer 4, the adhesive layer 7 is correspondingly located on the outside of the first liquid absorbing layer 2 or the second liquid absorbing layer 4. During installation, the liquid leakage detection device is attached to the position where liquid leakage detection is required through the adhesive layer 7, such as the inner wall of the shell outside the pipeline connection, and the side of the radio frequency tag 1 where the humidity sensor 3 is provided is facing the shell, and the back is facing the pipeline, so as to react to liquid leakage more quickly and realize liquid leakage detection. Exemplarily, the thickness of the bonding layer ranges from 0.1 to 0.5 mm, preferably from 0.2 to 0.4 mm. Exemplarily, the thickness of the bonding layer 7 is 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm.

[0056] In some embodiments, the liquid leakage detection device further includes a first absorbing material layer 5 and / or a second absorbing material layer 6. The first absorbing material layer 5 is disposed on the surface of the first liquid absorbing layer 2 facing away from the radio frequency tag 1, and the second absorbing material layer 6 is disposed on the side of the radio frequency tag 1 facing away from the first absorbing layer 2. It can be understood that the second absorbing material layer 6 is disposed on the side of the radio frequency tag 1 facing away from the first absorbing layer 2. In the case where the second absorbing layer 4 is disposed on the side of the radio frequency tag 1 facing away from the first absorbing layer 2, the second absorbing material layer 6 is disposed on the surface of the second absorbing layer 4 facing away from the radio frequency tag 1; in the case where the second absorbing layer 4 is not disposed on the side of the radio frequency tag 1 facing away from the first absorbing layer 2, the second absorbing material layer 6 is disposed on the surface of the side of the radio frequency tag 1 facing away from the first absorbing layer 2. In one example, the liquid leakage detection device is provided with the first absorbing material layer 5 or the second absorbing material layer 6; in another example, the liquid leakage detection device is provided with both the first absorbing material layer 5 and the second absorbing material layer 6. By providing the first absorbing material layer 5 or the second absorbing material layer 6, it is avoided that the metal liquid cooling pipeline absorbs and reflects electromagnetic waves, causing signal detuning and affecting the RFID function. At the same time, it can also avoid the problem of RSSI decrease caused by the plastic pipeline when there is a liquid with a high dielectric constant, thereby improving the accuracy, reliability and anti-interference ability of leakage detection.

[0057] Exemplarily, the thickness of the first absorbing material layer 5 and the second absorbing material layer 6 is in the range of 0.1-0.5 mm, preferably 0.2-0.4 mm, and exemplary, the thickness of the first absorbing material layer 5 and the second absorbing material layer 6 is 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm. As above, it can ensure that the absorbing material layer can play its absorbing function while avoiding too much space occupation in the thickness direction.

[0058] In some embodiments, the frequency range of the radio frequency tag 1 is 860-960 MHz or 2.45 GHz. The signal frequency band used by the RFID detection system is an ultra-high frequency signal, which has a longer transmission distance, can carry more information, and is more easily disturbed by liquid, that is, it is easier to identify leakage.

[0059] In some embodiments, the humidity sensor 3 is detachably provided on the radio frequency tag 1. The humidity sensor 3 is detachably installed, and two different forms of liquid leakage detection devices can be provided. The first is that the radio frequency tag 1 is provided with a humidity sensor 3, and the information of the radio frequency tag 1 and the humidity sensor 3 is comprehensively measured to determine whether there is a liquid leakage. The second is that the humidity sensor 3 is not provided on the radio frequency tag 1. Specifically, the first liquid absorbing layer 2 made of a humidity-sensitive material can be used to identify humidity through changes in signal resonance frequency and signal strength, thereby realizing liquid leakage detection. In this way, the radio frequency tag 1 has a simpler structure, lower cost, and uses a higher signal frequency. The corresponding reader detection signal is different from the first way.

[0060] The present application also provides a liquid leakage detection method, which is used in any of the liquid leakage detection devices in the above embodiments. The liquid leakage detection method includes:

[0061] S1: Obtain the intensity of the reflected signal of the radio frequency tag 1 and the humidity detected by the humidity sensor 3;

[0062] S2: When the intensity of the reflected signal of the radio frequency tag 1 changes and the humidity detected by the humidity sensor 3 is greater than the preset humidity, it is determined that leakage occurs at the position corresponding to the leakage detection device.

[0063] The liquid leakage detection device is installed at the position to be detected. For example, the liquid leakage detection device is installed on the inner wall of the shell, wherein the shell covers the connection between the liquid cooling pipe and the joint. The reflection signal generated by the radio frequency tag 1 of the liquid leakage detection device and the humidity detected by the humidity sensor 3 are received. When the intensity of the reflection signal of the radio frequency tag 1 changes, such as the RSSI indicator of the received signal strength decreases, and the humidity detected by the humidity sensor 3 is greater than the preset humidity, such as greater than 98%RH, it is determined that a liquid leakage occurs.

[0064] The liquid leakage detection method provided by the present invention uses the characteristic that the intensity of the reflected signal of the radio frequency tag 1 is affected by the liquid to detect the liquid leakage. It can realize wireless liquid leakage detection, thus being able to adapt to the liquid leakage detection of complex series-parallel pipelines and joints, and has low installation requirements for liquid cooling components and low cost.

[0065] At the same time, in the present application, by integrating the humidity sensor 3 on the radio frequency tag 1, the humidity sensor 3 can detect the moisture content in the environment. When the intensity of the reflected signal of the radio frequency tag 1 changes and the humidity detected by the humidity sensor 3 is greater than the preset humidity, it indicates that a leakage occurs at the location where the leakage detection device is set. That is, the humidity sensor 3 is combined with the radio frequency tag 1 to reflect whether there is a leakage, which can avoid the abnormal signal strength when the radio frequency tag 1 is interfered, thereby avoiding the error caused by the detection accuracy of the humidity sensor 3, thereby improving the accuracy and precision of the leakage detection.

[0066] In some embodiments, after determining that a leakage occurs at a position corresponding to the leakage detection device, the method further includes: triggering a leakage alarm, so that relevant devices or personnel can take corresponding responses or measures to prevent damage caused by the leakage.

[0067] In some embodiments, leakage detection devices are respectively provided at different locations where leakage detection is required, and the leakage detection method includes:

[0068] Obtain the intensity of the reflected signal of the radio frequency tag 1 of each missed detection device and the humidity detected by the humidity sensor 3;

[0069] When the intensity of the reflected signal of the radio frequency tag 1 changes, and the humidity detected by the humidity sensor 3 is greater than the preset humidity, it is determined that leakage occurs at the position corresponding to the leakage detection device;

[0070] The leakage location and leakage amount are determined by the difference in the results of each leakage detection device.

[0071] The server liquid cooling system has multiple pipelines. When the length of the pipeline is long, it will cause different amounts of leakage in different areas. Therefore, one or more leakage detection devices can be set on each pipeline as needed. The radio frequency tag 1 of each leakage detection device is unique, so each radio frequency tag 1 can be matched with the pipeline position in the data processing system, thereby realizing leakage positioning detection. Specifically, each leakage detection device can be arranged in sequence at a certain distance to avoid signal interference between radio frequency tags 1. In summary, the leakage detection method can realize leakage positioning detection of liquid cooling pipelines and joints, and can evaluate the leakage amount based on the detection signals of multiple radio frequency tags 1.

[0072] Based on the liquid leakage detection device provided in the above embodiment, the present invention further provides a liquid cooling system, which includes any one of the liquid leakage detection devices in the above embodiment. Since the liquid cooling system adopts the liquid leakage detection device in the above embodiment, please refer to the above embodiment for the beneficial effects of the liquid cooling system.

[0073] The liquid cooling system inside the server generally includes a manifold (water distributor), parallel or series pipes and a liquid cooling plate, depending on the number of heat dissipation chips required and the complexity of the layout. The liquid used is generally a water-based coolant. The material of the liquid cooling pipe can be plastic or metal, and the length ranges from 5 to 200 cm. The connection methods between the liquid cooling pipe and the cold plate or manifold include pagoda joints, brazed joints or clamps. Since leakage often occurs in the liquid cooling pipe or the connection between the liquid cooling pipe and the joint, the leakage detection objects are mainly the liquid cooling pipe and the connection between the liquid cooling pipe and the joint.

[0074] In some embodiments, see Figure 4 and Figure 5The liquid cooling system includes a liquid cooling tube 20 and a joint 30 connected to the liquid cooling tube 20. A shell 40 is provided outside the liquid cooling tube 20 and the joint 30, and the shell 40 covers the connection between the liquid cooling tube 20 and the joint 30. The leakage detection device 10 is arranged on the inner wall of the shell 40. The shell 40 isolates the liquid cooling tube 20 and the joint 30 from the outside world, and the leakage will be collected by the shell 40 to avoid leakage into the server and causing damage to the device. When installing the leakage detection device 10, first stick the leakage detection device 10 to the inner wall of the shell 40, then insert the liquid cooling tube 20, shrink the shell 40 toward the middle of the liquid cooling tube 20, and then connect the liquid cooling tube 20 and the joint 30, and finally fix and seal the two ends of the shell 40 with the liquid cooling tube 20 or the joint 30. Exemplarily, the two ends of the liquid cooling tube 20 are respectively connected to the joints 30, and the two ends of the shell 40 extend to the joints 30 at the two ends, and are respectively sealed with the joints 30 to form. Figure 4 and Figure 5 The sealing area M between the middle shell 40 and the joint 30. Specifically, the shell 40 is a flexible shell 40 to better adapt to the liquid cooling tube 20. Exemplarily, the distance between the inner wall of the shell 40 and the outer wall of the liquid cooling tube 20 ranges from 0.5 to 3 mm.

[0075] Since the signal reception and reflection of RFID are directional, liquid will gather at the bottom of the shell 40 when it leaks. Exemplarily, the leakage detection device 10 is arranged at the bottom of the shell 40, or the bottom of the shell 40 corresponding to the liquid cooling tube 20 and the connection between the liquid cooling tube 20 and the joint 30, so that the leakage can be absorbed more quickly to achieve leakage detection.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid leakage detection device, characterized in that: include: A radio frequency tag (1), wherein the radio frequency tag is capable of reflecting a signal and the signal strength changes when encountering liquid; A first liquid absorbing layer (2) is provided on the surface of the radio frequency tag (1) and is used to absorb liquid so that the radio frequency tag (1) is in contact with the liquid; The humidity sensor (3) is used to detect humidity, and when the intensity of the reflected signal of the radio frequency tag encountering liquid changes, the humidity detected by the humidity sensor (3) is greater than a preset humidity.

2. The liquid leakage detection device according to claim 1, characterized in that: It also comprises a second liquid absorbing layer (4) for absorbing liquid, wherein the first liquid absorbing layer (2) is arranged on a first side surface of the radio frequency tag (1), and the second liquid absorbing layer (4) is arranged on a second side surface of the radio frequency tag (1), and the second side surface is opposite to the first side surface.

3. The liquid leakage detection device according to claim 2, characterized in that: The first liquid absorbing layer (2) and / or the second liquid absorbing layer (4) is a humidity-sensitive material, and the dielectric constant of the humidity-sensitive material changes in a liquid-absorbing state.

4. The liquid leakage detection device according to claim 2, characterized in that: The first liquid-absorbing layer (2) is a porous sponge layer or a modified polymer liquid-absorbing fiber woven layer; And / or the second liquid-absorbing layer (4) is a porous sponge layer or a modified polymer liquid-absorbing fiber woven layer.

5. The liquid leakage detection device according to claim 1, characterized in that: It also comprises an adhesive layer (7), the adhesive layer (7) forming a side surface of the liquid leakage detection device and being located on a side of the radio frequency tag (1) on which the humidity sensor (3) is provided.

6. The liquid leakage detection device according to any one of claims 1 to 5, characterized in that: The invention also comprises a first absorbing material layer (5) and / or a second absorbing material layer (6), wherein the first absorbing material layer (5) is arranged on a surface of the first liquid absorbing layer (2) facing away from the radio frequency tag (1), and the second absorbing material layer (6) is arranged on a side of the radio frequency tag (1) facing away from the first liquid absorbing layer (2).

7. The liquid leakage detection device according to claim 1, characterized in that: The frequency range of the radio frequency tag (1) is 860-960 MHz or 2.45 GHz.

8. The liquid leakage detection device according to claim 1, characterized in that: The humidity sensor (3) is detachably arranged on the radio frequency tag (1).

9. A method for detecting a liquid leakage, characterized in that: A liquid leakage detection device as claimed in any one of claims 1 to 8, comprising: Acquiring the intensity of the reflection signal of the radio frequency tag (1) and the humidity detected by the humidity sensor (3); When the intensity of the reflection signal of the radio frequency tag (1) changes, and the humidity detected by the humidity sensor (3) is greater than the preset humidity, it is determined that a leakage occurs at the position corresponding to the leakage detection device.

10. A liquid cooling system, comprising a liquid cooling pipe (20) and a joint (30) connected to the liquid cooling pipe (20); characterized in that: It also includes a liquid leakage detection device (10) as described in any one of claims 1 to 8, wherein the liquid cooling tube (20) and the joint (30) are provided with a shell (40) outside, and the shell (40) covers the connection between the liquid cooling tube (20) and the joint (30), and the liquid leakage detection device (10) is arranged on the inner wall of the shell (40).

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