Liquid cooling heat dissipation unit, liquid cooling heat dissipation device and server

Abstract

The present disclosure relates to the technical field of liquid-cooled heat dissipation devices, and discloses a liquid-cooled heat dissipation unit, a liquid-cooled heat dissipation device, and a server, wherein the liquid-cooled heat dissipation unit includes a liquid-cooled plate body and a support plate, the liquid-cooled plate body is provided with a liquid-cooled cavity, a liquid supply port and a liquid drain port, the liquid supply port and the liquid drain port are both connected to the liquid-cooled cavity, the support plate is suitable for connecting to a heat-dissipating target component, and the liquid-cooled plate body is connected to the side of the support plate facing the heat-dissipating target component, and the liquid-cooled heat dissipation unit of the present disclosure has relatively high overall strength and is not easily damaged.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority and privilege from a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on December 28, 2023, bearing application number 202311829963.8 and entitled "Liquid-cooled heat dissipation unit, liquid-cooled heat dissipation device and server," the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of liquid cooling and heat dissipation devices, and more particularly to a liquid cooling and heat dissipation unit, a liquid cooling and heat dissipation device, and a server. [Background technology]

[0003] In scenarios with relatively high computing power demands, servers often incorporate multiple GPU (graphics processing unit) chips. While these GPU chips meet the computing power demands, they often consume too much power, generating a large amount of heat. Using air-cooled cooling devices to dissipate heat from GPU chips is ineffective, and air-cooled cooling devices have strict requirements regarding height, number of fans, and power consumption, which can easily lead to an increase in the height of the server chassis. Liquids, on the other hand, have a much higher specific heat capacity than air, so liquid-cooled cooling devices are more effective than air-cooled cooling devices, and they are shorter in height and occupy less space within the server chassis.

[0004] Existing liquid cooling heat dissipation devices include multiple liquid cooling plates, a water supply system, and a drainage system. The liquid cooling plates include an aluminum alloy cover plate and an aluminum alloy base plate, which are attached together to form a cavity. Nozzles are provided at both ends of the liquid cooling plate, each communicating with the cavity. The nozzles are connected to the water supply system and the drainage system via rubber hoses. The aluminum alloy base plate of each liquid cooling plate is attached to the corresponding GPU chip with a spring screw, which results in a liquid cooling heat dissipation device with relatively low overall strength and is easily damaged during removal and installation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] China Patent Publication CN116860091A [Patent Document 2] China Patent Publication CN115617139A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of this, the present disclosure provides a liquid-cooled heat dissipation unit, a liquid-cooled heat dissipation device, and a server to solve the problem that the strength of the liquid-cooled heat dissipation device is relatively low and it is easily damaged. [Means for solving the problem]

[0007] In a first aspect, the present disclosure provides a liquid-cooled heat dissipation unit, comprising a liquid-cooled plate body and a support plate, wherein the liquid-cooled plate body is provided with a liquid-cooled cavity, a liquid supply port and a liquid drain port, the liquid supply port and the liquid drain port both being connected to the liquid-cooled cavity, the support plate being suitable for connection to a heat-dissipating component, and the liquid-cooled plate body being connected to the side of the support plate facing the heat-dissipating component.

[0008] In some embodiments, a positioning portion is protruding from the liquid cooling plate body, a positioning cavity is provided within the positioning portion, the positioning cavity is connected to the liquid cooling cavity, the liquid supply port and the liquid discharge port are both connected to the liquid cooling cavity through the positioning cavity, a positioning hole is provided correspondingly on the support plate, and the positioning portion is connected within the positioning hole.

[0009] In some embodiments, the positioning hole is a through hole, and when the liquid cooling plate body and the support plate are connected in a predetermined position, the top of the positioning portion facing away from the liquid cooling plate body and the top of the support plate facing away from the heat dissipation target component are positioned in the same plane.

[0010] In some embodiments, a first connection hole is provided in the liquid cooling plate body, a second connection hole is provided in the support plate, and the first connection hole and the second connection hole are provided correspondingly and connected by a first fastener.

[0011] In some embodiments, the liquid cooling plate body is made of copper plate.

[0012] In some embodiments, the support plate has a recessed groove recessed toward the heat dissipation target component, and a third connection hole is provided at the bottom of the recessed groove, and the third connection hole is connected to the heat dissipation target component by a second fastener.

[0013] In some embodiments, a peripheral wall extending toward the heat dissipation target component is provided on the outer periphery of the support plate, a stopper groove is provided in the peripheral wall, and the liquid cooling plate body is provided in the stopper groove.

[0014] In a second aspect, the present disclosure provides a liquid-cooled heat dissipation device, comprising: The liquid-cooled heat dissipation unit includes at least two sets of liquid-cooled heat dissipation units arranged sequentially along a first direction, and each set has at least two liquid-cooled heat dissipation units arranged sequentially along a second direction; a first bracket extending along the second direction, disposed between two adjacent pairs of the liquid cooling heat dissipation units, and connected to each of the two adjacent pairs of the liquid cooling heat dissipation units; a liquid supply system in which the liquid supply ports of the liquid cooling heat dissipation units are all in communication with each other; a drainage system in which the drain ports of each of the liquid-cooled heat dissipation units are all in communication with each other; Here, the liquid-cooled heat dissipation device is further provided, wherein the first direction is perpendicular to the second direction.

[0015] In some embodiments, in the first direction, the liquid supply system and the liquid drainage system are both provided on one side of at least two sets of the liquid cooling heat dissipation units.

[0016] In some embodiments, there are two sets of liquid-cooled heat dissipation units, one set away from the liquid supply system and the liquid drainage system is a first liquid-cooled heat dissipation unit, and one set closer to the liquid supply system and the liquid drainage system is a second liquid-cooled heat dissipation unit, the liquid supply port of the first liquid-cooled heat dissipation unit is connected to the corresponding second liquid-cooled heat dissipation unit in the first direction via a first liquid supply line, the liquid supply port of the second liquid-cooled heat dissipation unit is connected to the liquid supply system via a second liquid supply line, the liquid drain port of the first liquid-cooled heat dissipation unit is connected to the corresponding second liquid-cooled heat dissipation unit in the first direction via a first drainage line, and the liquid drain port of the second liquid-cooled heat dissipation unit is connected to the liquid drainage system via a second drainage line.

[0017] In some embodiments, further comprising: a second bracket extending along the second direction and connected to one end of each of the first liquid-cooled heat dissipation units, the end being away from the liquid supply system; and a third bracket extending along the second direction and connected to one end of each of the pair of second liquid-cooled heat-dissipating units that is closer to the liquid supply system.

[0018] In some embodiments, the support plate of the first liquid-cooled heat dissipation unit has a first connection block and a second connection block protruding from both ends in the first direction, the support plate of the second liquid-cooled heat dissipation unit has a third connection block and a fourth connection block protruding from both ends in the first direction, the first connection block, the second connection block, the third connection block, and the fourth connection block are all located at ends closest to the heat dissipation target component, one side of the first bracket in the first direction is connected to the first connection block of a set of first liquid-cooled heat dissipation units, and the other side is connected to the third connection block of a set of second liquid-cooled heat dissipation units, the second bracket is connected to the second connection block of a set of first liquid-cooled heat dissipation units, and the third bracket is connected to the fourth connection block of a set of second liquid-cooled heat dissipation units.

[0019] In some embodiments, the first bracket has a first protrusion that protrudes in a direction away from the heat dissipation target component, and the first liquid supply line and the first liquid drain line are both provided in the first protrusion.

[0020] In some embodiments, the third bracket has a second protrusion that protrudes in a direction away from the heat dissipation target component, and the second liquid supply line and the second liquid drain line are both provided in the second protrusion.

[0021] In some embodiments, the lifting handle further includes a lifting handle having both ends removably connected to the second bracket and the third bracket, respectively, and a mounting groove is provided at an intermediate position of the lifting handle, the mounting groove being removably connected to the first bracket, the lifting handle being divided into two handle portions by the mounting groove, and an easy-to-operate operating gap is formed between the handle portions and the support plate.

[0022] In some embodiments, a first relief groove and a second relief groove are provided on a side of the support plate of the first liquid-cooled heat dissipation unit facing the heat dissipation target component, the first relief groove and the second relief groove are provided at an interval in the second direction, one end of the first liquid supply pipe is provided in the first relief groove, and one end of the first liquid drain pipe is provided in the second relief groove, A third relief groove and a fourth relief groove are provided on the side of the second liquid-cooled heat dissipation unit facing the heat dissipation target component, the third relief groove and the fourth relief groove are provided at intervals in the second direction, and the second liquid-cooled heat dissipation unit has the third relief groove and the fourth relief groove on both ends in the first direction, the other end of the first liquid-cooled heat dissipation unit is provided in the third relief groove close to the first liquid-cooled heat dissipation unit, the other end of the first liquid-drainage pipe is provided in the fourth relief groove close to the first liquid-cooled heat dissipation unit, one end of the second liquid-supply pipe is provided in the third relief groove close to the liquid supply system, and one end of the second liquid-drainage pipe is provided in the fourth relief groove close to the liquid-drainage system.

[0023] In some embodiments, the liquid supply system includes a liquid supply distributor and a liquid supply fitting, the liquid supply distributor communicating with an end of the second liquid supply line remote from the second liquid-cooled heat dissipation unit and communicating with the liquid supply fitting via a third liquid supply line; the drainage system includes a drainage collector and a drainage joint, the drainage collector communicating with an end of the second drainage line remote from the second liquid-cooled heat dissipation unit and communicating with the drainage joint via a third drainage line; In the first direction, the liquid supply separator is arranged between the waste liquid collector and the second liquid cooling heat dissipation unit, the liquid supply separator is provided with a fifth relief groove, and the second drainage pipe passes through the fifth relief groove and communicates with the waste liquid collector.

[0024] In some embodiments, the device further includes a first fastener, a second fastener, and a third fastener, wherein the first fastener fixedly connects one end of the liquid supply separator to a corresponding end of the waste liquid collector and is suitable for connection to a heat dissipation target element, the second fastener is fixedly connected to the other end of the liquid supply separator and is suitable for connection to a heat dissipation target element, and the third fastener fixedly connects the liquid supply separator and the waste liquid collector and is located between the first fastener and the second fastener and is suitable for connection to a heat dissipation target element on one side of the waste liquid collector away from the waste liquid collector.

[0025] In some embodiments, the liquid cooling heat dissipation device further includes a fixing block, the fixing block is suitable for connecting to a server chassis, and the liquid supply joint and the liquid drain joint are both connected to the fixing block.

[0026] In a third aspect, the present disclosure further provides a server including a heat dissipation target component that is a graphics processing unit and the liquid-cooling heat dissipation device. [Brief explanation of the drawings]

[0027] In order to more clearly describe the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings that are required to be used in the description of the specific embodiments or the prior art. Of course, the drawings in the following description are merely a part of the embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 illustrates a liquid-cooled heat dissipation unit according to an embodiment of the present disclosure. [Figure 2] 1 is an exploded view illustrating the installation of a liquid-cooled heat dissipation unit according to an embodiment of the present disclosure. [Figure 3] 1 is a partial cross-sectional view of a liquid cooling plate body of a liquid cooling heat dissipation unit according to an embodiment of the present disclosure. [Figure 4] 1A and 1B are diagrams illustrating the structure of a liquid-cooled heat dissipation device according to an embodiment of the present disclosure. [Figure 5] 1A and 1B are diagrams illustrating a local structure of a liquid-cooled heat dissipation device according to an embodiment of the present disclosure. [Figure 6] 1 is a diagram illustrating the flow of liquid in a liquid cooling heat dissipation device according to an embodiment of the present disclosure. [Figure 7] 1 is a diagram illustrating a liquid supply system and a liquid drainage system of a liquid cooling heat dissipation device according to an embodiment of the present disclosure. [Figure 8] 1A and 1B are diagrams illustrating a fixing block of a liquid-cooled heat dissipation device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0028] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure, and of course, the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present disclosure without any creative work fall within the scope of protection of the present disclosure.

[0029] Hereinafter, an embodiment of the present disclosure will be described with reference to FIGS.

[0030] According to an embodiment of the present disclosure, on the one hand, as shown in Figures 1 to 3, there is provided a liquid-cooled heat dissipation unit, which includes a liquid-cooled plate main body 1 and a support plate 2, wherein the liquid-cooled plate main body 1 is provided with a liquid-cooled cavity 101, a liquid supply port 102 and a liquid drain port, and the liquid supply port 102 and the liquid drain port are both connected to the liquid-cooled cavity 101, the support plate 2 is suitable for connection to a component to be dissipated, and the liquid-cooled plate main body 1 is connected to the side of the support plate 2 facing the component to be dissipated.

[0031] The liquid cooling plate body 1 of each liquid cooling heat dissipation unit is connected to a support plate 2, which not only firmly connects the liquid cooling plate body 1 to the target component, but also allows the liquid cooling plate body 1 to directly contact the target component to dissipate heat, thereby improving the strength of the entire liquid cooling heat dissipation unit and making it less likely to be damaged during installation and removal. Furthermore, because the support plate 2 and the liquid cooling plate body 1 are both plate-shaped, the overall height of the liquid cooling heat dissipation unit is relatively low, saving vertical space and meeting the needs of a liquid cooling heat dissipation means for a server graphic display with a relatively small 1U height.

[0032] Specifically, in some embodiments, the heat dissipation target component may be a GPU (graphics processing unit), the liquid-cooled heat dissipation unit may be a water-cooled heat dissipation unit, and the coolant is water.

[0033] In some embodiments, a positioning portion 103 is protruded from the liquid cooling plate body 1, a positioning cavity 104 is provided within the positioning portion 103, the positioning cavity 104 is connected to the liquid cooling cavity 101, the liquid supply port 102 and the liquid discharge port are both connected to the liquid cooling cavity 101 via the positioning cavity 104, a positioning hole 21 is provided correspondingly on the support plate 2, and the positioning portion 103 is connected within the positioning hole 21.

[0034] The positioning portion 103 plays a role in positioning during the installation process of the liquid cooling plate body 1 and the support plate 2, which not only simplifies the installation of the liquid cooling plate body 1 and the support plate 2, but also provides a large space for the liquid supply port 102 and the liquid drain port, thereby providing a relatively large liquid supply port 102 and liquid drain port without increasing the thickness of the liquid cooling plate body 1. In addition, the thickness of the positioning cavity 104 is greater than that of the liquid cooling cavity 101, and the liquid supply port 102 and the liquid drain port are connected to the positioning cavity 104, so that the positioning cavity 104 can buffer both the liquid supply and drain, thereby facilitating the inflow and outflow of the cooling liquid and improving the fluidity of the cooling liquid.

[0035] Specifically, in some embodiments, a partition plate is further provided within the positioning cavity 104, one end of which is connected between the liquid inlet 102 and the liquid outlet, and the portion of the positioning cavity 104 close to the liquid inlet 102 and the liquid outlet is divided into a first cavity and a second cavity, both of which are connected to the liquid cooling cavity 101. Alternatively, the first cavity and the second cavity may or may not be connected to each other, with the first cavity connected to the liquid inlet 102 and the second cavity connected to the liquid outlet. The installation of the partition plate can prevent the liquid supplied from the liquid inlet 102 from being directly discharged through the liquid outlet, further improving the fluidity of the cooling liquid and also preventing large temperature differences in the cooling liquid within the liquid cooling plate body 1 and preventing uneven heat dissipation.

[0036] In some embodiments, the positioning hole 21 is a through hole, and when the liquid cooling plate body 1 and the support plate 2 are connected in a predetermined position, the top of the positioning portion 103 facing away from the liquid cooling plate body 1 and the top of the support plate 2 facing away from the heat dissipation target component are located in the same plane.

[0037] The top of the positioning portion 103 facing away from the liquid-cooled plate body 1 and the top of the support plate 2 facing away from the heat dissipation target component are located on the same plane, ensuring the flatness of the top of the liquid-cooled heat dissipation unit facing away from the heat dissipation target component and preventing the protrusions from causing scratches or scuffs or interfering with other stopper components.

[0038] Alternatively, the positioning hole 21 may be a blind hole, with the opening facing the member to be heat dissipated.

[0039] In some embodiments, the liquid cooling plate body 1 is provided with a first connection hole 105, and the support plate 2 is provided with a second connection hole 22, and the first connection hole 105 and the second connection hole 22 are provided correspondingly and connected by a first fastener.

[0040] The first fastener can fixedly connect the liquid cooling plate body 1 and the support plate 2 via the first connection hole 105 and the second connection hole 22. Specifically, the first fastener may be a fastening structure that is easy to remove, such as a screw or a bolt, or a fastening structure that is difficult to remove, such as a rivet.

[0041] In some embodiments, the liquid cooling plate body 1 is made of copper plate.

[0042] Copper has a relatively large specific heat capacity and a high heat dissipation effect. Furthermore, by matching the positioning portion 103 and the positioning hole 21, the height of the entire liquid-cooled heat dissipation unit can be set to between 8 mm and 10 mm, preferably 9 mm, thereby saving a large amount of space inside the server where the heat dissipation target component is installed.

[0043] In some embodiments, the support plate 2 has a recessed groove 23 recessed toward the heat dissipation target component, and a third connection hole 231 is provided at the bottom of the recessed groove 23, and the third connection hole 231 is connected to the heat dissipation target component by a second fastener.

[0044] By providing the countersunk groove 23, the second fastener can be sunk into the inside of the support plate 2, preventing the second fastener from protruding from the top of the support plate 2 and preventing the protruding second fastener from increasing the height of the entire liquid-cooled heat dissipation unit.

[0045] Specifically, the second fastener may be a fastening structure that is easy to remove, such as a screw or a bolt, or a fastening structure that is difficult to remove, such as a rivet. Preferably, the third connection hole 231 is removably connected to the heat dissipation target component by the second fastener.

[0046] In some embodiments, a peripheral wall extending toward the heat dissipation target member is provided on the outer periphery of the support plate 2, a stopper groove is provided in the peripheral wall, and the liquid cooling plate body 1 is provided in the stopper groove.

[0047] The peripheral wall allows the support plate 2 to be formed into a cover, and when combined with the heat dissipation target component, a mounting cavity can be formed, thereby better protecting and supporting the liquid cooling plate body 1. Furthermore, the stopper grooves allow the liquid cooling plate body 1 to be stopped and fixed.

[0048] On the other hand, according to an embodiment of the present disclosure, as shown in Figures 1 to 8, there is further provided a liquid-cooled heat dissipation device including the above-mentioned liquid-cooled heat dissipation unit, a first bracket 3, a liquid supply system 4 and a liquid drainage system 5, wherein the liquid-cooled heat dissipation units include at least two sets arranged sequentially along a first direction, and each set has at least two liquid-cooled heat dissipation units arranged sequentially along a second direction, and each liquid-cooled heat dissipation unit includes a liquid-cooled plate body 1 and a support plate 2, the liquid-cooled plate body 1 is provided with a liquid-cooled cavity 101, a liquid supply port 102 and a liquid drainage port, and the liquid supply port 102 and the liquid drainage port are both connected to the liquid-cooled cavity 101, the support plate 2 is suitable for connection to a heat-dissipating target component, and the liquid-cooled plate body 1 is connected to the side of the support plate 2 facing the heat-dissipating target component. The first bracket 3 extends along the second direction, is arranged between two adjacent sets of liquid-cooled heat dissipation units, and is connected to each of the liquid-cooled heat dissipation units in the two adjacent sets, the liquid supply ports 102 of each liquid-cooled heat dissipation unit are connected to the liquid supply system 4, and the liquid drain ports of each liquid-cooled heat dissipation unit are connected to the liquid drainage system 5, where the first direction is perpendicular to the second direction.

[0049] The liquid supply system 4 fills each liquid cooling heat dissipation unit with coolant through the liquid supply port 102 and discharges the coolant that has absorbed heat from each liquid cooling heat dissipation unit through the liquid discharge port, thereby achieving the heat dissipation effect of the liquid cooling heat dissipation unit. The provision of the first bracket 3 connects two adjacent sets of liquid cooling heat dissipation units together in the first direction, greatly improving the overall strength of the liquid cooling heat dissipation device and making the liquid cooling heat dissipation units less susceptible to damage during installation and removal.

[0050] In some embodiments, in the first direction, the liquid supply system 4 and the liquid drainage system 5 are both provided on one side of at least two sets of liquid cooling heat dissipation units.

[0051] In the related art, the liquid supply system 4 and the liquid drainage system 5 are respectively provided on both sides of at least two liquid cooling heat dissipation units, and the drainage collector 51 of the liquid drainage system 5 requires a relatively long hose to connect to the drainage joint 52, which increases the risk of snagging devices in the server. In this embodiment, the liquid supply system 4 and the liquid drainage system 5 are both provided on one side of the at least two liquid cooling heat dissipation units, and the drainage collector 51 of the liquid drainage system 5 does not need to be connected to the drainage joint 52 with a long hose; instead, a pipe of an appropriate length is sufficient to connect them, thereby reducing the space occupied by the entire liquid cooling heat dissipation apparatus and avoiding the risk of snagging devices. The liquid supply separator 41 of the liquid supply system 4 is provided adjacent to the liquid supply joint 42.

[0052] In some embodiments, there are two sets of liquid-cooled heat dissipation units, one set away from the liquid supply system 4 and the liquid drainage system 5 is a first liquid-cooled heat dissipation unit 6, and one set closer to the liquid supply system 4 and the liquid drainage system 5 is a second liquid-cooled heat dissipation unit 7, the liquid supply port 102 of the first liquid-cooled heat dissipation unit 6 is connected to the corresponding second liquid-cooled heat dissipation unit 7 in the first direction via a first liquid supply line 8, the liquid supply port 102 of the second liquid-cooled heat dissipation unit 7 is connected to the liquid supply system 4 via a second liquid supply line 9, the liquid drain port of the first liquid-cooled heat dissipation unit 6 is connected to the corresponding second liquid-cooled heat dissipation unit 7 in the first direction via a first drainage line 10, and the liquid drain port of the second liquid-cooled heat dissipation unit 7 is connected to the liquid drainage system 5 via a second drainage line 11.

[0053] The second liquid supply line 9 and the first liquid supply line 8 sequentially connect the liquid supply of the second liquid cooling heat dissipation unit 7 and the first liquid cooling heat dissipation unit 6, and the first liquid drain line 10 and the second liquid drain line 11 sequentially connect the liquid drain of the first liquid cooling heat dissipation unit 6 and the second liquid cooling heat dissipation unit 7, thereby reducing the length of the pipelines and simplifying the pipeline structure.

[0054] Specifically, a liquid supply port 102 and a liquid drain port are provided at both ends in the first direction of the liquid cooling plate body 1 of the second liquid cooling heat dissipation unit 7, and the liquid supply port 102 at one end and the liquid drain port at the other end are located in corresponding positions. A liquid supply port 102 and a liquid drain port are provided at one end of the liquid cooling plate body 1 of the first liquid cooling heat dissipation unit 6 facing the second liquid cooling heat dissipation unit 7, and the position of the liquid supply port 102 of the first liquid cooling heat dissipation unit 6 corresponds to the position of the liquid drain port of the second liquid cooling heat dissipation unit 7 facing the first liquid cooling heat dissipation unit 6.

[0055] A third liquid-cooled heat dissipation unit may be further included between the first liquid-cooled heat dissipation unit 6 and the second liquid-cooled heat dissipation unit 7, with a liquid supply port 102 and a liquid discharge port at both ends in the first direction, and connected in series between the first liquid-cooled heat dissipation unit 6 and the second liquid-cooled heat dissipation unit 7 via a pipeline. There may be one third liquid-cooled heat dissipation unit, or multiple third liquid-cooled heat dissipation units may be provided at intervals along the first direction.

[0056] In some embodiments, the system further includes a second bracket 12 and a third bracket 13, the second bracket 12 extending along the second direction and both connected to one end of the first set of liquid-cooled heat dissipation units 6 that is away from the liquid supply system 4, and the third bracket 13 extending along the second direction and both connected to one end of the second set of liquid-cooled heat dissipation units 7 that is closer to the liquid supply system 4.

[0057] The second bracket 12 can connect a set of first liquid-cooled heat dissipation units 6 together, further improving the connection strength and overall strength of the set of first liquid-cooled heat dissipation units 6, and the third bracket 13 can connect a set of second liquid-cooled heat dissipation units 7 together, further improving the connection strength and overall strength of the set of second liquid-cooled heat dissipation units 7.

[0058] Specifically, the third bracket 13 is fixedly connected to the liquid supply system 4 or the liquid drainage system 5 .

[0059] In some embodiments, the support plate 2 of the first liquid-cooled heat dissipation unit 6 has a first connection block 61 and a second connection block 62 protruding from both ends in the first direction, the support plate 2 of the second liquid-cooled heat dissipation unit 7 has a third connection block 71 and a fourth connection block 72 protruding from both ends in the first direction, the first connection block 61, the second connection block 62, the third connection block 71 and the fourth connection block 72 are all located at one end closest to the heat dissipation target component, one side of the first bracket 3 in the first direction is connected to the first connection block 61 of the set of first liquid-cooled heat dissipation units 6, and the other side is connected to the third connection block 71 of the set of second liquid-cooled heat dissipation units 7, the second bracket 12 is connected to the second connection block 62 of the set of first liquid-cooled heat dissipation units 6, and the third bracket 13 is connected to the fourth connection block 72 of the set of second liquid-cooled heat dissipation units 7.

[0060] The first connection block 61, the second connection block 62, the third connection block 71 and the fourth connection block 72 are all provided at one end close to the heat dissipation target component, which reduces the connection height of the first bracket 3, the second bracket 12 and the third bracket 13 and prevents the first bracket 3, the second bracket 12 and the third bracket 13 from protruding from the top of the liquid-cooled heat dissipation device after connection.

[0061] Specifically, in some embodiments, there are two first connection blocks 61, each provided on either side of the support plate 2 of the first liquid-cooled heat dissipation unit 6 along the second direction; two second connection blocks 62, each provided on either side of the support plate 2 of the first liquid-cooled heat dissipation unit 6 along the second direction; two third connection blocks 71, each provided on either side of the support plate 2 of the second liquid-cooled heat dissipation unit 7 along the second direction; and two fourth connection blocks 72, each provided on either side of the support plate 2 of the second liquid-cooled heat dissipation unit 7 along the second direction. A fourth connection hole is provided in the first connection block 61, and a corresponding fifth connection hole is provided in the first bracket 3. The fourth and fifth connection holes are connected by a third fastener. The third fastener may be a fastening structure that is easy to remove, such as a screw or a bolt, or a fastening structure that is difficult to remove, such as a rivet. A sixth connection hole is provided in the second connection block 62, and a corresponding seventh connection hole is provided in the second bracket 12, and the sixth and seventh connection holes are connected by a fourth fastener. The fourth fastener may be a fastening structure that is easy to remove, such as a screw or bolt, or a fastening structure that is difficult to remove, such as a rivet. An eighth connection hole is provided in the third connection block 71, and a corresponding ninth connection hole is provided in the first bracket 3, and the eighth and ninth connection holes are connected by a fifth fastener. The fifth fastener may be a fastening structure that is easy to remove, such as a screw or bolt, or a fastening structure that is difficult to remove, such as a rivet. A tenth connection hole is provided in the fourth connection block 72, and a corresponding eleventh connection hole is provided in the third bracket 13, and the tenth and eleventh connection holes are connected by a sixth fastener. The sixth fastener may be a fastening structure that is easy to remove, such as a screw or bolt, or a fastening structure that is difficult to remove, such as a rivet.

[0062] In some embodiments, the first bracket 3 has a first protrusion 31 that protrudes in a direction away from the heat dissipation target component, and the first liquid supply line 8 and the first liquid drain line 10 are both provided in the first protrusion 31.

[0063] The first protrusion can provide relief for the first supply line 8 and the first drain line 10, and can provide a stopper and protection.

[0064] In some embodiments, the third bracket 13 has a second protrusion 131 that protrudes away from the heat dissipation target component, and the second liquid supply line 9 and the second liquid drain line 11 are both provided in the second protrusion 131.

[0065] The second protrusion can provide a circumvention, a stopper and protection for the second supply line 9 and the second drain line 11 .

[0066] Specifically, the first bracket 3, the second bracket 12, and the third bracket 13 can all be formed by processing sheet metal members.

[0067] In some embodiments, the lifting handle 14 further includes a lifting handle 14 whose ends are removably connected to the second bracket 12 and the third bracket 13, respectively, and a mounting groove 141 is provided at the middle position of the lifting handle 14, which is removably connected to the first bracket 3, and the lifting handle 14 is divided into two handle portions 142 by the mounting groove 141, and an easy-to-operate operating gap is formed between the handle portion 142 and the support plate 2.

[0068] The provision of a lifting handle 14 makes it easy for maintenance staff to operate. The lifting handle 14 has both ends connected to the second bracket 12 and the third bracket 13, respectively, and a mounting groove 141 at its middle position, through which the handle can be detachably connected to the first bracket 3, preventing the liquid-cooled heat dissipation unit from escaping and being damaged. An operating gap is formed between the handle portion 142 and the support plate 2, making it easy for maintenance staff to pass their fingers or lifting tools through.

[0069] Specifically, in some embodiments, the lifting handle 14 can be formed from a sheet metal member, which is simple in structure and occupies little space.

[0070] In some embodiments, a first relief groove and a second relief groove are provided on the support plate 2 of the first liquid cooling heat dissipation unit 6 on a side facing the heat dissipation target component, and the first relief groove and the second relief groove are provided at an interval in the second direction, one end of the first liquid supply pipe 8 is provided in the first relief groove and one end of the first liquid drain pipe 10 is provided in the second relief groove, and a third relief groove 24 and a fourth relief groove 25 are provided on the side of the second liquid cooling heat dissipation unit 7 facing the heat dissipation target component, and the third relief groove 24 and the fourth relief groove 25 are provided at an interval in the second direction. and a third relief groove 24 and a fourth relief groove 25 are provided at both ends of the second liquid-cooled heat dissipation unit 7 in the first direction, the other end of the first liquid supply pipeline 8 is provided in the third relief groove 24 close to the first liquid-cooled heat dissipation unit 6, the other end of the first liquid drainage pipeline 10 is provided in the fourth relief groove 25 close to the first liquid-cooled heat dissipation unit 6, one end of the second liquid supply pipeline 9 is provided in the third relief groove 24 close to the liquid supply system 4, and one end of the second liquid drainage pipeline 11 is provided in the fourth relief groove 25 close to the liquid drainage system 5.

[0071] The first and second relief grooves provide a relief for the first liquid supply line 8 and the first liquid drain line 10, respectively, thereby reducing the overall height of the first liquid cooling heat dissipation unit 6. The third and fourth relief grooves 24 and 25 provide a relief for the first liquid supply line 8 and the first liquid drain line 10, respectively, thereby reducing the overall height of the second liquid cooling heat dissipation unit 7, and also avoid the second liquid supply line 9 and the second liquid drain line 11, respectively, thereby reducing the overall height of the second liquid cooling heat dissipation unit 7.

[0072] Specifically, in some embodiments, a first protruding bump is provided at one end of the support plate 2 of the first liquid cooling heat dissipation unit 6, and the first bump is located between the first and second undercut grooves to support the lifting handle 14 and improve strength. A second protruding bump is provided at both ends of the support plate 2 of the second liquid cooling heat dissipation unit 7, and the second bump is located between the third and fourth undercut grooves 24 and 25 to support the lifting handle 14 and improve strength.

[0073] In some embodiments, the liquid supply system 4 includes a liquid supply separator 41 and a liquid supply fitting 42, the liquid supply separator 41 being connected to one end of the second liquid supply line 9 remote from the second liquid-cooled heat dissipation unit 7 and connected to the liquid supply fitting 42 via a third liquid supply line 43, the liquid drainage system 5 including a liquid waste collector 51 and a liquid drain fitting 52, the liquid waste collector 51 being connected to one end of the second liquid drain line 11 remote from the second liquid-cooled heat dissipation unit 7 and connected to the liquid drain fitting 52 via the third liquid drain line 53, in the first direction the liquid supply separator 41 is arranged between the liquid waste collector 51 and the second liquid-cooled heat dissipation unit 7, the liquid supply separator 41 is provided with a fifth relief groove 44, and the second liquid drain line 11 passes through the fifth relief groove and is connected to the liquid waste collector.

[0074] The provision of the fifth undercut groove 44 facilitates communication between the second drainage line 11 and the waste liquid collector 51, thereby facilitating connection using the existing second drainage line 11, and further providing a degree of stoppering and fixing for the liquid supply separator 41 and the waste liquid collector 51.

[0075] Alternatively, in the first direction, the waste liquid collector 51 is provided between the liquid supply separator 41 and the second liquid cooling heat dissipation unit 7, the waste liquid collector 51 is provided with a fifth relief groove 44, and the second liquid supply line 9 passes through the fifth relief groove 44 and communicates with the liquid supply separator 41.

[0076] Specifically, in some embodiments, the second supply line 9 is welded to the supply separator 41 and the second drain line 11 is welded to the drain collector 51 .

[0077] Specifically, in some embodiments, the liquid supply distributor 41 is a tubular structure, preferably a rectangular tube extending along the second direction, and has one first inlet and multiple first outlets, the first inlet is connected to the liquid supply fitting 42 via the third liquid supply line 43, the number of first outlets matches the number of second liquid-cooled heat dissipation units 7, and each first outlet is connected to the liquid supply port 102 of one second liquid-cooled heat dissipation unit 7 via the second liquid supply line 9, or the number of first outlets is greater than the number of second liquid-cooled heat dissipation units 7, and each liquid supply port 102 of each second liquid-cooled heat dissipation unit 7 is connected to a corresponding first outlet via the second liquid supply line 9, and the remaining first outlets are sealed with a sealing cover. The waste liquid collector 51 has a rectangular, tubular structure, preferably a rectangular tube extending along the second direction, and has one second outlet and multiple second inlets, the second outlet being connected to the drain fitting 52 via a third drain line 53, the number of second inlets being the same as the number of second liquid-cooled heat dissipation units 7, and each second inlet being connected to the drain port of one second liquid-cooled heat dissipation unit 7 via a second drain line 11, or the number of second inlets being greater than the number of second liquid-cooled heat dissipation units 7, and each drain port of each second liquid-cooled heat dissipation unit 7 being connected to a corresponding second inlet via a second drain line 11, and the remaining second inlets being sealed with a sealing cover.

[0078] In some embodiments, the device further includes a first fixture 15, a second fixture 16, and a third fixture 17, wherein the first fixture 15 fixedly connects one end of the liquid supply separator 41 to a corresponding end of the waste liquid collector 51 and is suitable for connection to a heat dissipation target component, the second fixture 16 is fixedly connected to the other end of the liquid supply separator 41 and is suitable for connection to a heat dissipation target component, and the third fixture 17 is fixedly connected to the liquid supply separator 41 and the waste liquid collector 51 and is located between the first fixture 15 and the second fixture 16 and is suitable for connection to a heat dissipation target component on one side of the waste liquid collector 51 away from the waste liquid collector 51.

[0079] The first fixing device 15, the second fixing device 16 and the third fixing device 17 are distributed in a triangular shape, which not only allows the waste liquid collector 51 and the liquid supply separator 41 to be firmly connected to the substrate card of the heat dissipation target component, but also allows the waste liquid collector 51 and the liquid supply separator 41 to be connected relatively firmly.

[0080] Specifically, in some embodiments, the first fixing device 15 includes a first fixing sheet and a second fixing sheet, both ends of the first fixing sheet are welded to one end of the liquid supply separator 41 and one end of the waste liquid collector 51, respectively, one end of the second fixing sheet is welded to the first fixing sheet and the other end is bent and abuts against the board card of the heat dissipation target component, the second fixing sheet has a twelfth connection hole, and the twelfth connection hole is connected to the board card of the heat dissipation target component by a seventh fastener, the second fixing device 16 has one end welded to the other end of the liquid supply separator 41 and the other end is bent and abuts against the board card of the heat dissipation target component, and the second fixing device 16 has a thirteenth connection hole, and the thirteenth connection hole is connected to the board card of the heat dissipation target component by an eighth fastener. The third fixing device 17 includes a third fixing sheet and a fourth fixing sheet, the third fixing sheet is welded to the tips of the liquid supply separator 41 and the waste liquid collector 51, one end of the fourth fixing sheet is welded to the third fixing sheet and the other end is folded to abut against the board card of the heat dissipation target component, and the fourth fixing sheet has a 14th connection hole that is connected to the board card of the heat dissipation target component by a ninth fastener. The fourth fixing device further includes a fourth fixing sheet that has a sheet-like structure and is welded to the tips of the liquid supply separator 41 and the waste liquid collector 51.

[0081] In some embodiments, the liquid cooling heat dissipation device further includes a fixed block 18, which is suitable for connection to a server chassis, and both the liquid supply fitting 42 and the liquid drain fitting 52 are connected to the fixed block 18.

[0082] The fixing block 18 is engaged with and connected to the front window of the server chassis, and fixes the liquid supply joint 42 and the liquid drain joint 52. Preferably, both the liquid supply joint 42 and the liquid drain joint 52 may be one-touch joints.

[0083] According to an embodiment of the present disclosure, there is further provided a server including a heat dissipation target component that is a graphics processing unit and the liquid-cooling heat dissipation device.

[0084] Specifically, there are eight graphics processing units, four first liquid-cooling heat dissipation units 6, and four second liquid-cooling heat dissipation units 7.

[0085] Although the embodiments of the present disclosure have been described with reference to the drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure, and all such modifications and variations are included in the scope of the appended claims. [Explanation of symbols]

[0086] 1...liquid cooling plate body, 101...liquid cooling cavity, 102...liquid supply port, 103...positioning portion, 104...positioning cavity, 105...first connection hole, 2...support plate, 21...positioning hole, 22...second connection hole, 23...counterbore groove, 231...third connection hole, 24...third undercut groove, 25...fourth undercut groove, 3...first bracket, 31...first protrusion, 4...liquid supply system, 41...liquid supply separator, 42...liquid supply joint, 43...third liquid supply line, 44...fifth undercut groove, 5...liquid drainage system, 51...liquid drain collector, 52...liquid drain joint, 53...third liquid drain line , 6...first liquid cooling heat dissipation unit, 61...first connection block, 62...second connection block, 7...second liquid cooling heat dissipation unit, 71...third connection block, 72...fourth connection block, 8...first liquid supply line, 9...second liquid supply line, 10...first liquid drain line, 11...second liquid drain line, 12...second bracket, 13...third bracket, 131...second protrusion, 14...lifting handle, 141...mounting groove, 142...handle portion, 15...first fixing device, 16...second fixing device, 17...third fixing device, 18...fixing block, 181...fixing hole.

Claims

1. a liquid-cooled plate body (1) provided with a liquid-cooled cavity (101), a liquid supply port (102), and a liquid drain port, the liquid supply port (102) and the liquid drain port both communicating with the liquid-cooled cavity (101); a support plate (2) arranged to be connected to a heat dissipation target component, wherein the liquid cooling plate body (1) includes a support plate (2) connected to the support plate (2) on a side of the support plate (2) facing the heat dissipation target component; A liquid-cooled heat dissipation unit characterized by:

2. A positioning portion (103) is provided protruding from the liquid cooling plate body (1), a positioning cavity (104) is provided within the positioning portion (103), the positioning cavity (104) is in communication with the liquid cooling cavity (101), and both the liquid supply port (102) and the liquid discharge port are in communication with the liquid cooling cavity (101) via the positioning cavity (104), Here, a positioning hole (21) is provided in the support plate (2), and the positioning portion (103) is connected to the positioning hole (21).

2. The liquid-cooled heat dissipation unit according to claim 1.

3. The positioning hole (21) is a through hole, and when the liquid cooling plate body (1) is connected to the support plate (2), the top of the positioning portion (103) facing away from the liquid cooling plate body (1) and the top of the support plate (2) facing away from the heat dissipation target member are positioned on the same plane.

3. The liquid-cooled heat dissipation unit according to claim 2.

4. A first connection hole (105) is provided in the liquid cooling plate body (1), a second connection hole (22) is provided in the support plate (2), the first connection hole (105) and the second connection hole (22) are provided corresponding to each other and connected by a first fastener; And / or the liquid cooling plate body (1) is made of copper plate; 2. The liquid-cooled heat dissipation unit according to claim 1.

5. The support plate (2) is provided with a countersunk groove (23) recessed toward the heat dissipation target component, and a third connection hole (231) is provided at the bottom of the countersunk groove (23), and the third connection hole (231) is connected to the heat dissipation target component by a second fastener.

5. The liquid-cooled heat dissipation unit according to claim 1.

6. 7. The liquid-cooled heat dissipation unit according to claim 1, wherein the liquid-cooled heat dissipation units include at least two sets of liquid-cooled heat dissipation units arranged sequentially along a first direction, and each set of the liquid-cooled heat dissipation units has at least two liquid-cooled heat dissipation units arranged sequentially along a second direction perpendicular to the first direction; a first bracket (3) extending along the second direction, provided between two adjacent sets of the liquid-cooled heat dissipation units, and connected to each of the liquid-cooled heat dissipation units in the two adjacent sets; a liquid supply system (4) in which the liquid supply ports (102) of the liquid cooling heat dissipation units are all in communication with each other; a drainage system (5) to which the drainage ports of each of the liquid-cooled heat dissipation units are all connected, A liquid cooling heat dissipation device characterized by:

7. In the first direction, the liquid supply system (4) and the liquid drainage system (5) are both provided on the same side of at least two sets of the liquid cooling heat dissipation units.

7. The liquid-cooled heat dissipation unit according to claim 6.

8. a first liquid-cooled heat dissipation unit (6) remote from the liquid supply system (4) and the liquid drainage system (5), and a second liquid-cooled heat dissipation unit (7) close to the liquid supply system (4) and the liquid drainage system (5); wherein the liquid supply port (102) of the first liquid-cooled heat dissipation unit (6) is connected to the corresponding second liquid-cooled heat dissipation unit (7) in the first direction via a first liquid supply pipe (8), and the liquid supply port (102) of the second liquid-cooled heat dissipation unit (7) is connected to the liquid supply system (4) via a second liquid supply pipe (9); Here, the drain port of the first liquid-cooled heat dissipation unit (6) is connected to the corresponding second liquid-cooled heat dissipation unit (7) in the first direction via a first drain pipe (10), and the drain port of the second liquid-cooled heat dissipation unit (7) is connected to the drain system (5) via a second drain pipe (11).

8. The liquid-cooled heat dissipation unit according to claim 7.

9. a second bracket (12) extending along the second direction and connected to one end of each of the first liquid-cooled heat dissipation units (6) remote from the liquid supply system (4); a third bracket (13) extending along the second direction and connected to one end of each of the second liquid-cooled heat dissipation units (7) that is closer to the liquid supply system (4); 9. The liquid-cooled heat dissipation unit according to claim 8.

10. The support plate (2) of the first liquid-cooled heat dissipation unit (6) has a first connection block (61) and a second connection block (62) protruding from both ends in the first direction, and the support plate (2) of the second liquid-cooled heat dissipation unit (7) has a third connection block (71) and a fourth connection block (72) protruding from both ends in the first direction, wherein the first connection block (61), the second connection block (62), the third connection block (71), and the fourth connection block (72) are all provided at one end close to the heat dissipation target component, Here, one side of the first bracket (3) in the first direction is connected to the first connection block (61) of one set of the first liquid-cooled heat dissipation units (6), and the other side is connected to the third connection block (71) of one set of the second liquid-cooled heat dissipation units (7); the second bracket (12) is connected to the second connection block (62) of one set of the first liquid-cooled heat dissipation units (6), and the third bracket (13) is connected to the fourth connection block (72) of one set of the second liquid-cooled heat dissipation units (7).

10. The liquid cooling heat dissipation unit according to claim 9.

11. The first bracket (3) has a first protrusion (31) protruding in a direction away from the heat dissipation target component, and the first liquid supply pipe (8) and the first liquid drain pipe (10) are both provided in the first protrusion (31).

10. The liquid cooling heat dissipation unit according to claim 9.

12. The third bracket (13) has a second protruding portion (131) protruding in a direction away from the heat dissipation target component, and the second liquid supply pipe (9) and the second liquid drain pipe (11) are both provided on the second protruding portion (131).

12. The liquid-cooled heat dissipation unit according to claim 11.

13. The lifting handle (14) further includes a lifting handle (14) whose both ends are detachably connected to the second bracket (12) and the third bracket (13), respectively. The lifting handle (14) has an attachment groove (141) at its intermediate position, and the attachment groove (141) is detachably connected to the first bracket (3). The lifting handle (14) is divided into two handle portions (142) by the attachment groove (141), and an easy-to-operate operating gap is formed between the handle portion (142) and the support plate (2).

10. The liquid cooling heat dissipation unit according to claim 9.

14. a first relief groove and a second relief groove are provided on the support plate (2) of the first liquid-cooled heat dissipation unit (6) on a side facing the heat dissipation target component, the first relief groove and the second relief groove are provided at an interval in the second direction, one end of the first liquid supply pipe (8) is provided in the first relief groove, and one end of the first liquid drain pipe (10) is provided in the second relief groove; a third relief groove (24) and a fourth relief groove (25) are provided on the side of the second liquid-cooled heat dissipation unit (7) facing the heat dissipation target component, the third relief groove (24) and the fourth relief groove (25) are provided at intervals in the second direction, and the third relief groove (24) and the fourth relief groove (25) are provided on both ends of the second liquid-cooled heat dissipation unit (7) in the first direction; the other end of the first liquid supply pipe (8) is provided in the third relief groove (24) close to the first liquid-cooling heat dissipation unit (6), and the other end of the first liquid drain pipe (10) is provided in the fourth relief groove (25) close to the first liquid-cooling heat dissipation unit (6); One end of the second liquid supply line (9) is provided in the third relief groove (24) close to the liquid supply system (4), and one end of the second liquid drain line (11) is provided in the fourth relief groove (25) close to the liquid drain system (5). The liquid cooling and heat dissipating device according to any one of claims 8 to 13.

15. the liquid supply system (4) includes a liquid supply separator (41) and a liquid supply joint (42), the liquid supply separator (41) being in communication with one end of the second liquid supply pipe (9) remote from the second liquid-cooled heat dissipation unit (7) and also in communication with the liquid supply joint (42) via a third liquid supply pipe (43); The drainage system (5) includes a drainage collector (51) and a drainage joint (52), the drainage collector (51) being in communication with one end of the second drainage pipe (11) remote from the second liquid-cooled heat dissipation unit (7) and in communication with the drainage joint (52) via a third drainage pipe (53). The liquid cooling and heat dissipating device according to any one of claims 8 to 13.

16. In the first direction, the liquid supply separator (41) is provided between the waste liquid collector (51) and the second liquid-cooled heat dissipation unit (7), The liquid supply / separator (41) is provided with a fifth relief groove (44), and the second drainage pipe (11) passes through the fifth relief groove (44) and communicates with the drainage collector (51).

16. The liquid cooling and heat dissipating device according to claim 15.

17. In the first direction, the waste liquid collector (51) is provided between the liquid supply separator (41) and the second liquid cooling heat dissipation unit (7), The waste liquid collector (51) is provided with a fifth relief groove (44), and the second liquid supply pipe (9) passes through the fifth relief groove (44) and communicates with the liquid supply collector (41).

16. The liquid cooling and heat dissipating device according to claim 15.

18. further comprising a first fixture (15), a second fixture (16) and a third fixture (17); Here, the first fixing device (15) is suitable for fixedly connecting one end of the liquid supply / separator (41) to a corresponding one end of the waste liquid collector (51), and also for connecting to a heat dissipation target member; The second fixture (16) is fixedly connected to the other end of the liquid supply / separation device (41) and is suitable for connection to a heat dissipation target member; a third fixture (17) fixedly connecting the liquid supply separator (41) and the waste liquid collector (51), and positioned between the first fixture (15) and the second fixture (16), and suitable for connecting the waste liquid collector (51) to a heat dissipation target member on one side of the waste liquid collector (51) remote from the waste liquid collector (51); 16. The liquid cooling and heat dissipating device according to claim 15.

19. The liquid cooling and heat dissipation device further includes a fixing block (18), the fixing block (18) is suitable for connection to a server chassis, and the liquid supply joint (42) and the liquid drain joint (52) are both connected to the fixing block (18).

19. The liquid cooling and heat dissipating device according to claim 18.

20. A heat dissipation target component that is a graphics processing unit and the liquid cooling heat dissipation device according to any one of claims 6 to 19, A server characterized by:

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