Liquid-leak detection sheet and liquid-cooling apparatus

Abstract

A liquid-leak detection sheet and a liquid-cooling apparatus. The liquid-leak detection sheet comprises a base sheet, a first liquid-leak detection wire and a second liquid-leak detection wire, wherein the outline of the base sheet in a top-view projection direction is adapted to the outline of an inner bottom surface of a liquid-collection recess in the top-view projection direction; the base sheet may be laid on the inner bottom surface of the liquid-collection recess; and the first liquid-leak detection wire and the second liquid-leak detection wire are distributed on the base sheet in a bent shape. By means of distribution in a bent shape, the liquid-leak detection range of a liquid-leak detection tape can be expanded, thereby improving the liquid-leak detection accuracy. In addition, when the liquid-leak detection tape is laid in a bent manner, it is difficult to ensure the flatness of the laying thereof. Therefore, the liquid-leak detection sheet provided in the present invention can be effectively applied to scenarios where the liquid-leakage area is relatively large and can also be applied to liquid-leak detection of liquid delivery pipelines.

Description

Liquid leakage detection piece and liquid cooling device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 19, 2024, with application number 202410084476.1 and application name “A Liquid Leakage Detection Sheet and Liquid Cooling Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of liquid cooling devices, and in particular to a liquid leakage detection piece and a liquid cooling device. Background Art

[0003] The server generates a lot of heat during operation. In order to ensure the normal operation of the server, a cooling device is needed to dissipate the heat from the server. The cooling devices mainly include air cooling devices and liquid cooling devices. Liquid cooling devices are widely used due to their advantages such as fast heat dissipation, low noise, low energy consumption and good environmental adaptability.

[0004] Since the liquid cooling device may leak during operation, if the leaked liquid comes into contact with electronic components on the server, it may damage the electronic components or even the entire server, resulting in serious consequences such as data loss.

[0005] Currently, leakage detection tapes are mainly used for leakage detection. However, leakage detection tapes are usually only suitable for leakage detection of infusion pipelines and are difficult to adapt to leakage detection areas with larger areas.

[0006] Summary of the Invention

[0007] One object of the present invention is to provide a liquid leakage detection piece that can be effectively applied to occasions where the liquid leakage detection area is large. Another object is to provide a liquid cooling device including the above-mentioned liquid leakage detection piece.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A liquid leakage detection sheet includes: a substrate, a first liquid leakage detection wire, and a second liquid leakage detection wire. The outer shape of the substrate in the top projection direction is adapted to the outer shape of the inner bottom surface of the liquid collection tank in the top projection direction. The substrate is used to be laid on the inner bottom surface of the liquid collection tank. The first liquid leakage detection wire and the second liquid leakage detection wire are distributed in a bent shape on the substrate.

[0010] In some embodiments, the first liquid leakage detection wire includes a first liquid leakage detection main line and at least one first liquid leakage detection branch line, the first liquid leakage detection branch line is connected to the first liquid leakage detection main line, the second liquid leakage detection branch line includes a second liquid leakage detection main line and at least one second liquid leakage detection branch line, the second liquid leakage detection branch line is connected to the second liquid leakage detection main line, and the first liquid leakage detection main line and the first liquid leakage detection branch line are spaced apart from the second liquid leakage detection main line and the second liquid leakage detection branch line.

[0011] In some embodiments, the first leakage detection main line and the second leakage detection main line are continuously distributed along the side of the upper surface of the substrate, and the first leakage detection branch line and the second leakage detection branch line are distributed within the range enclosed by the first leakage detection main line and the second leakage detection main line.

[0012] In some embodiments, at least one first main line detection piece is provided on the side of the first leakage detection main line facing the second leakage detection branch line, and at least one second branch line detection piece is provided on the side of the second leakage detection branch line facing the first leakage detection main line; at least one second main line detection piece is provided on the side of the second leakage detection main line facing the first leakage detection branch line, and at least one first branch line detection piece is provided on the side of the first leakage detection branch line facing the second leakage detection main line.

[0013] In some embodiments, at least one first branch line detection piece is provided on both sides of the first leakage detection branch line; at least one second branch line detection piece is provided on both sides of the second leakage detection branch line; the first branch line detection piece on the side of the first leakage detection branch line facing the second leakage detection main line is staggered with the second main line detection piece, and the first branch line detection piece on the other side of the first leakage detection branch line is staggered with the second branch line detection piece; the second branch line detection piece on the side of the second leakage detection branch line facing the first leakage detection main line is staggered with the first main line detection piece, and the second branch line detection piece on the other side of the second leakage detection branch line is staggered with the first branch detection piece.

[0014] In some embodiments, the first branch line detection pieces on both sides of the first liquid leakage detection branch line are staggered, and the second branch line detection pieces on both sides of the second liquid leakage detection branch line are staggered.

[0015] In some embodiments, a liquid injection joint, a liquid return joint and a liquid extraction area are provided on the bottom plate of the liquid collection tank, an injection avoidance port for avoiding the liquid injection joint and a liquid return avoidance port for avoiding the liquid return joint are provided on the substrate, and a liquid extraction avoidance port for avoiding the liquid extraction area is provided on the substrate.

[0016] In some embodiments, the first lead-out terminals of the first and second liquid leakage detection wires are close to the liquid injection avoidance port, and the second lead-out terminals of the first and second liquid leakage detection wires are close to the liquid return avoidance port.

[0017] In some embodiments, a liquid extraction area is provided on the bottom plate of the liquid collecting tank, and a liquid extraction avoidance port for avoiding the liquid extraction area is provided on the substrate.

[0018] In some embodiments, the leakage detection sheet also includes a first broken wire detection wire and a second broken wire detection wire provided on the substrate, the first broken wire detection wire is located on the outside of the first leakage detection wire and is spaced apart from the first leakage detection wire, and the second broken wire detection wire is located on the outside of the second leakage detection wire and is spaced apart from the second leakage detection wire.

[0019] A liquid cooling device comprises the liquid leakage detection sheet as described in any one of the above items, and also comprises the liquid collecting trough, wherein the liquid leakage detection sheet is laid on the inner bottom surface of the liquid collecting trough.

[0020] Compared with the existing technology, the above technical solution has the following advantages:

[0021] The present invention provides a liquid leakage detection sheet and liquid cooling device. Since the outer shape of the substrate in the top projection direction is adapted to the outer shape of the inner bottom surface of the liquid collecting tank in the top projection direction, the substrate can be fully spread on the inner bottom surface of the liquid collecting tank. Compared with the prior art that uses a liquid leakage detection tape bent and attached to the inner bottom surface of the liquid collecting tank, it can not only improve the assembly convenience of the liquid leakage detection sheet, but also avoid the problem of the first liquid leakage detection wire and the second liquid leakage detection wire being broken due to bending. In addition, when the liquid leakage detection tape is bent and laid, it is difficult to ensure the flatness of the laying. Therefore, the liquid leakage detection sheet provided by the present invention can be effectively applied to occasions with large leakage areas, and can also be applied to leakage detection of infusion pipelines. For example, the liquid leakage detection sheet can be bent and rolled into an arc structure that adapts to the infusion pipeline, thereby realizing leakage detection of the infusion pipeline within multiple angles in the circumferential direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] FIG1 is a schematic structural diagram of a liquid leakage detection sheet provided by a specific embodiment of the present invention;

[0024] FIG2 is a schematic structural diagram of a liquid leakage detection sheet provided by another specific embodiment of the present invention;

[0025] FIG3 is a schematic diagram of a top view of a liquid collecting tank of a liquid cooling device provided by a specific embodiment of the present invention;

[0026] FIG4 is a schematic cross-sectional structural diagram of a liquid collecting tank of a liquid cooling device provided by a specific embodiment of the present invention.

[0027] The accompanying drawings are marked as follows: 10 is a substrate, 11 is a liquid injection avoidance port, 12 is a liquid return avoidance port, and 13 is a liquid extraction avoidance port; 20 is a first liquid leakage detection conductor, 21 is a first liquid leakage detection main line, 211 is a first main line detection piece, 22 is a first liquid leakage detection branch line, and 221 is a first branch line detection piece; 30 is a second liquid leakage detection conductor, 31 is a second liquid leakage detection main line, 311 is a second main line detection piece, 32 is a second liquid leakage detection branch line, and 321 is a second branch line detection piece; 40 is a first lead-out terminal; 50 is a second lead-out terminal; 60 is a first wire break detection conductor; 70 is a second wire break detection conductor; 80 is a liquid collecting tank, 81 is a liquid injection joint, 82 is a liquid return joint, and 83 is a liquid extraction area. DETAILED DESCRIPTION

[0028] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Referring to Figures 1 and 3 , an embodiment of the present invention provides a liquid leakage detection sheet comprising: a substrate 10, a first liquid leakage detection conductor 20, and a second liquid leakage detection conductor 30. The outer shape of the substrate 10 in the top projection direction is adapted to the outer shape of the inner bottom surface of a liquid collecting tank 80 in the top projection direction. The liquid collecting tank 80 can collect liquid leaking from the liquid cooling device. When the inner bottom surface of the liquid collecting tank 80 is rectangular, the substrate 10 is also rectangular. When the inner bottom surface of the liquid collecting tank 80 has other shapes, the outer shape of the substrate 10 is adapted to the liquid collecting tank 80. The substrate 10 can be laid on the inner bottom surface of the liquid collecting tank 80, and the two can be fixed by bonding or other methods. The first liquid leakage detection conductor 20 and the second liquid leakage detection conductor 30 are distributed in a zigzag shape on the substrate 10. The first and second liquid leakage detection conductors 20 and 30 can be integrally formed on the substrate 10 by electroplating. When leaking liquid simultaneously contacts the first and second leakage detection wires 20 and 30, the first and second leakage detection wires 20 and 30 are short-circuited, thereby enabling leak detection. The curved distribution pattern increases the leakage detection range of the leakage detection strip, thereby improving leak detection accuracy. Compared to the prior art method of bending the leakage detection strip and attaching it to the inner bottom surface of the liquid collection tank 80, this not only improves the assembly convenience of the leakage detection strip, but also avoids the problem of the first and second leakage detection wires 20 and 30 breaking due to bending. Furthermore, when the leakage detection strip is laid in a curved shape, it is difficult to ensure the smoothness of the laying. Therefore, the leakage detection strip provided by the present invention is effectively applicable to applications with large leakage areas and is also suitable for leak detection in infusion pipelines. For example, the leakage detection strip can be bent and rolled into an arc-shaped structure that conforms to the infusion pipeline, thereby enabling leak detection in the infusion pipeline at multiple angles.

[0030] In some embodiments, the first leakage detection wire 20 includes a first leakage detection main line 21 and at least one first leakage detection branch line 22, the first leakage detection branch line 22 is connected to the first leakage detection main line 21, and the two ends of the first leakage detection main line 21 are used to connect to the leakage detector, or to connect to other leakage detection belts or leakage detection sheets; the second leakage detection wire 30 includes a second leakage detection main line 31 and at least one second leakage detection branch line 32, the second leakage detection branch line 32 is connected to the second leakage detection main line 31, and the two ends of the second leakage detection main line 31 are used to connect to the leakage detector, or to connect to other leakage detection belts or leakage detection sheets. The first leakage detection main line 21 and the first leakage detection branch line 22 are spaced apart from the second leakage detection main line 31 and the second leakage detection branch line 32. That is, the first leakage detection main line 21 is spaced apart from the second leakage detection main line 31 and the second leakage detection branch line 32. The first leakage detection branch line 22 also needs to be spaced apart from the second leakage detection main line 31 and the second leakage detection branch line 32. By distributing the first leakage detection branch line 22 and the second leakage detection branch line 32 on the substrate 10, the leakage detection accuracy of the leakage detection sheet can be effectively improved.

[0031] In some embodiments, as shown in Figures 1 and 2, the first leakage detection main line 21 and the second leakage detection main line 31 are continuously distributed along the side of the upper surface of the substrate 10, and the first leakage detection branch line 22 and the second leakage detection branch line 32 are distributed within the range enclosed by the first leakage detection main line 21 and the second leakage detection main line 31. As shown in Figure 1, the first leakage detection main line 21 has two first leakage detection branch lines 22, and the second leakage detection main line 31 has two second leakage detection branch lines 32. The two first leakage detection branch lines 22 and the two second leakage detection branch lines 32 are staggered. As shown in Figure 2, the first leakage detection main line 21 has one first leakage detection branch line 22, and the second leakage detection main line 31 has one second leakage detection branch line 32. The first leakage detection branch line 22 and the second leakage detection branch line 32 are located in the middle of the substrate 10. When the area of ​​the inner bottom surface of the water collection tank is larger, a leakage detection sheet with more first leakage detection branch lines 22 and second leakage detection branch lines 32 can be used, as shown in Figure 1; when the area of ​​the inner bottom surface of the water collection tank is smaller, a leakage detection sheet with fewer first leakage detection branch lines 22 and second leakage detection branch lines 32 can be used, as shown in Figure 2.

[0032] In some embodiments, as shown in Figures 1 and 2, at least one first main line detection piece 211 is provided on the side of the first leakage detection main line 21 facing the second leakage detection branch line 32, and multiple first main line detection pieces 211 are distributed at equal or unequal intervals, and at least one second branch line detection piece 321 is provided on the side of the second leakage detection branch line 32 facing the first leakage detection main line 21, and multiple second branch line detection pieces 321 are distributed at equal or unequal intervals; at least one second main line detection piece 311 is provided on the side of the second leakage detection main line 31 facing the first leakage detection branch line 22, and multiple second main line detection pieces 311 are distributed at equal or unequal intervals, and at least one first branch line detection piece 221 is provided on the side of the first leakage detection branch line 22 facing the second leakage detection main line 31, and multiple first branch line leakage detection pieces are distributed at equal or unequal intervals. When the leaking liquid contacts the first leakage main line and the second leakage detection main line 31 at the same time, or contacts the first leakage detection main line 21 and the second leakage detection branch line 32 at the same time, or contacts the second leakage detection main line 31 and the first leakage detection branch line 22 at the same time, or contacts the first main line detection piece 211 and the second branch line detection piece 321 at the same time, or contacts the first main line detection piece 211 and the second leakage detection branch line 32 at the same time, or contacts the second main line detection piece 311 and the first branch line detection piece 221 at the same time, or contacts the second main line detection piece 311 and the first leakage detection branch line 22, the leakage detection function can be realized.

[0033] It should be noted that the first leakage detection branch line 22 and the second leakage detection branch line 32 can also be set near the sides of the substrate 10, and the sections of the first leakage detection main line 21 and the second leakage detection main line 31 that are used to contact the leaked liquid can be set in the middle or near the middle of the substrate 10, or the first leakage detection branch line 22 and the second leakage detection branch line 32 can be distributed in half of the area on the upper surface of the base tape, and the first leakage detection main line 21 and the second leakage detection main line 31 can be distributed in the other half of the area on the upper surface of the base tape. Since the first leakage detection branch line and the second leakage detection have no direct connection with the leakage detector or other leakage detection tape or other leakage detection sheet, part or all of the first leakage detection branch line can be cut off from the first leakage main line, and part or all of the second leakage detection branch line can be cut off from the second leakage main line, so that the leakage detection sheet can adapt to scenarios with different leakage detection areas.

[0034] In some embodiments, as shown in Figures 1 and 2, at least one first branch line detection piece 221 is respectively provided on both sides of the first leakage detection branch line 22; at least one second branch line detection piece 321 is respectively provided on both sides of the second leakage detection branch line 32; the first branch line detection piece 221 on the side of the first leakage detection branch line 22 facing the second leakage detection main line 31 is staggered with the second main line detection piece 311, and the first branch line detection piece 221 on the other side of the first leakage detection branch line 22 is staggered with the second branch line detection piece 321; the second branch line detection piece 321 on the side of the second leakage detection branch line 32 facing the first leakage detection main line 21 is staggered with the first main line detection piece 211, and the second branch line detection piece 321 on the other side of the second leakage detection branch line 32 is staggered with the first branch detection piece 221. By respectively arranging the first branch line detection pieces 221 on both sides of the first leakage detection branch line 22, the first leakage detection branch line can be arranged between the second leakage detection main line 31 and the second leakage detection branch line; by respectively arranging the second branch line detection pieces 321 on both sides of the second leakage detection branch line 32, the second leakage detection branch line 32 can be arranged between the first leakage detection main line 21 and the first leakage detection branch line 22.

[0035] In some embodiments, the first branch line detection pieces 221 on both sides of the first leakage detection branch line 22 are staggered, that is, the first branch line detection pieces 221 on both sides are located at different positions along the length of the first leakage detection branch line 22. The second branch line detection pieces 321 on both sides of the second leakage detection branch line 32 are staggered, that is, the second branch line detection pieces 321 on both sides are located at different positions along the length of the second leakage detection branch line 32. The first main line detection piece 211 and the second branch line detection piece 321 on the second leakage detection branch line 32, which is far away from it, are located in the same extension direction. The second main line detection piece 311 and the first branch line detection piece 221 on the first leakage detection branch line 22, which is far away from it, are located in the same extension direction. The first branch line detection piece 221 and the second branch line detection piece 321 on different sides are located in the same extension direction. The specific distribution method can be seen in Figures 1 and 2.

[0036] In some embodiments, a liquid injection joint 81 and a liquid return joint 82 are provided on the bottom plate of the liquid collecting tank 80. The liquid injection joint 81 is used to transport the coolant to the bottom of the liquid collecting tank 80, and the liquid return joint 82 is used to transport the coolant after heat exchange from the bottom of the liquid collecting tank 80. The substrate 10 is provided with a liquid injection avoidance port 11 for avoiding the liquid injection joint 81 and a liquid return avoidance port 12 for avoiding the liquid return joint 82. The liquid injection avoidance port 11 and the liquid return avoidance port 12 can avoid the interference of the liquid injection joint 81 and the liquid return joint 82 on the leakage detection piece, thereby ensuring the flatness of the leakage detection piece laid on the bottom plate of the liquid collecting tank 80.

[0037] In some embodiments, as shown in Figures 1 and 2, the first lead-out terminal 40 of the first leakage detection wire 20 and the second leakage detection wire 30 is close to the liquid injection avoidance port 11, and the second lead-out terminal 50 of the first leakage detection wire 20 and the second leakage detection wire 30 is close to the liquid return avoidance port 12. Since the infusion pipe in the liquid cooling system is connected to the injection joint 81, and the return pipe is connected to the return joint 82, a leakage detection belt is provided in the infusion pipe and the injection pipe, and the leakage detection belt will extend from the infusion pipe and the injection pipe. Therefore, the present application sets the first lead-out terminal 40 at a position close to the liquid injection avoidance port 11, and sets the second lead-out terminal 50 at a position close to the liquid return avoidance port 12, so as to facilitate the connection between the leakage detection piece and the leakage detection belt.

[0038] In some embodiments, a liquid extraction area 83 is provided on the bottom plate of the liquid collection tank 80. The height of the liquid extraction area 83 is lower than the upper surface of the bottom plate, so that the leaked liquid collected in the liquid collection tank 80 can flow to the liquid extraction area 83. The inlet of the water extraction pipe can be set in the liquid extraction area 83, and the leaked liquid in the liquid collection tank 80 can be extracted through the water extraction pipe. The substrate 10 is provided with a liquid extraction avoidance port 13 for avoiding the liquid extraction area 83. The liquid extraction avoidance port 13 can prevent the leakage detection sheet from covering the liquid extraction area 83, thereby ensuring that the leaked liquid flows into the liquid extraction area 83.

[0039] In some embodiments, the leakage detection sheet further includes a first disconnection detection wire 60 and a second disconnection detection wire 70 disposed on the substrate 10. The first disconnection detection wire 60 is located outside the first leakage detection wire 20 and spaced apart from the first leakage detection wire 20. The second disconnection detection wire 70 is located outside the second leakage detection wire 30 and spaced apart from the second leakage detection wire 30. Both ends of the first disconnection detection wire 60 and the second disconnection detection wire 70 extend to the first lead-out terminal 40 and the second lead-out terminal 50, respectively. The leakage detector can detect whether the first leakage detection wire 20 and the second leakage detection wire 30 are disconnected through the first disconnection detection wire 60 and the second disconnection detection wire 70, thereby facilitating timely maintenance of the leakage detection sheet in the event of a disconnection.

[0040] An embodiment of the present invention also provides a liquid cooling device, comprising the leakage detection piece provided by any of the above embodiments, and also comprising a liquid collecting tank 80, wherein the leakage detection piece is fully spread on the inner bottom surface of the liquid collecting tank 80, and the leakage detection piece can be installed on the inner bottom surface of the liquid collecting tank 80 by pasting or other fixing methods. When liquid seeps upward from the four sides of the bottom of the liquid collecting tank 80 to the upper surface of the leakage detection piece, or when liquid drips downward from the liquid injection joint 81 and the liquid return joint 82 and falls on the upper surface of the leakage detection piece, the leakage detection piece can detect leakage in the liquid cooling device.

[0041] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0042] 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.

[0043] The above describes in detail the liquid leakage detection sheet and liquid cooling device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, various improvements and modifications can be made to the present invention without departing from the principles of the present invention. Such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A liquid leakage detection sheet, characterized in that, Including: A substrate (10), a first liquid leakage detection wire (20), and a second liquid leakage detection wire (30). The outer shape of the substrate (10) in the top view projection direction is adapted to the outer shape of the inner bottom surface of the liquid collection tank (80) in the top view projection direction. The substrate (10) is used to be laid on the inner bottom surface of the liquid collection tank (80). The first liquid leakage detection wire (20) and the second liquid leakage detection wire (30) are distributed in a bent shape on the substrate (10).

2. The liquid leakage detection sheet according to claim 1, wherein, The first liquid leakage detection wire (20) includes a first liquid leakage detection main line (21) and at least one first liquid leakage detection branch line (22). The first liquid leakage detection branch line (22) is connected to the first liquid leakage detection main line (21). The second liquid leakage detection wire (30) includes a second liquid leakage detection main line (31) and at least one second liquid leakage detection branch line (32). The second liquid leakage detection branch line (32) is connected to the second liquid leakage detection main line (31). The first liquid leakage detection main line (21) and the first liquid leakage detection branch line (22) are spaced apart from the second liquid leakage detection main line (31) and the second liquid leakage detection branch line (32).

3. The liquid leakage detection sheet according to claim 2, wherein The first liquid leakage detection main line (21) and the second liquid leakage detection main line (31) are continuously distributed along the side of the upper surface of the substrate (10). The first liquid leakage detection branch line (22) and the second liquid leakage detection branch line (32) are distributed within the range enclosed by the first liquid leakage detection main line (21) and the second liquid leakage detection main line (31).

4. The liquid leakage detection sheet according to claim 3, wherein On the side of the first liquid leakage detection main line (21) facing the second liquid leakage detection branch line (32), there are at least one first main line detection piece (211). On the side of the second liquid leakage detection branch line (32) facing the first liquid leakage detection main line (21), there are at least one second branch line detection piece (321). On the side of the second liquid leakage detection main line (31) facing the first liquid leakage detection branch line (22), there are at least one second main line detection piece (311). On the side of the first liquid leakage detection branch line (22) facing the second liquid leakage detection main line (31), there are at least one first branch line detection piece (221).

5. The liquid leakage detection sheet according to claim 4, characterized in that On both sides of the first liquid leakage detection branch line (22), at least one piece of the first branch line detection piece (221) is provided; on both sides of the second liquid leakage detection branch line (32), at least one piece of the second branch line detection piece (321) is provided; the first branch line detection piece (221) on the side of the first liquid leakage detection branch line (22) facing the second liquid leakage detection main line (31) is distributed in a staggered manner with the second main line detection piece (311), and the first branch line detection piece (221) on the other side of the first liquid leakage detection branch line (22) is distributed in a staggered manner with the second branch line detection piece (321); the second branch line detection piece (321) on the side of the second liquid leakage detection branch line (32) facing the first liquid leakage detection main line (21) is distributed in a staggered manner with the first main line detection piece (211), and the second branch line detection piece (321) on the other side of the second liquid leakage detection branch line (32) is distributed in a staggered manner with the first branch line detection piece (221).

6. The liquid leakage detection sheet according to claim 5, characterized in that, The first branch line detection pieces (221) on both sides of the first liquid leakage detection branch line (22) are distributed in a staggered manner, and the second branch line detection pieces (321) on both sides of the second liquid leakage detection branch line (32) are distributed in a staggered manner.

7. The liquid leakage detection sheet according to claim 1, characterized in that, On the bottom plate of the liquid collecting tank (80), a liquid injection joint (81), a liquid return joint (82) and a liquid pumping area (83) are provided. On the substrate (10), a liquid injection avoidance opening (11) for avoiding the liquid injection joint (81) and a liquid return avoidance opening (12) for avoiding the liquid return joint (82) are provided. On the substrate (10), a liquid pumping avoidance opening (13) for avoiding the liquid pumping area (83) is provided.

8. The liquid leakage detection sheet according to claim 7, wherein The first lead-out connection terminals (40) of the first liquid leakage detection wire (20) and the second liquid leakage detection wire (30) are close to the liquid injection avoidance opening (11), and the second lead-out connection terminals (50) of the first liquid leakage detection wire (20) and the second liquid leakage detection wire (30) are close to the liquid return avoidance opening (12).

9. The liquid leakage detection sheet according to any one of claims 1 to 8, characterized in that, The liquid leakage detection piece further includes a first wire break detection wire (60) and a second wire break detection wire (70) provided on the substrate (10). The first wire break detection wire (60) is located outside the first liquid leakage detection wire (20) and is arranged at an interval from the first liquid leakage detection wire (20). The second wire break detection wire (70) is located outside the second liquid leakage detection wire (30) and is arranged at an interval from the second liquid leakage detection wire (30).

10. A liquid cooling device, characterized in that, Comprising the liquid leakage detection piece according to any one of claims 1 to 9, further comprising the liquid collecting tank (80), and the liquid leakage detection piece is laid on the inner bottom surface of the liquid collecting tank (80).

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