Patent Publication Number: US-2023156958-A1

Title: Liquid cooling device

Description:
RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Application Ser. No. 63/280,870, filed Nov. 18, 2021 and U.S. Provisional Application Ser. No. 63/303,263, filed Jan. 26, 2022, the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure generally relates to a liquid cooling device. More particularly, the present disclosure relates to a liquid cooling device of a display card. 
     BACKGROUND 
     With the advancement of technology, electronic products have become more popular, and gradually changed the life or work of many people. As the speed of the computers increases, the calculating power of the display cards becomes more and more powerful so that the temperature control of the electronic components such as the graphics processing units (GPUs) is more important. 
     Electronic components such as the graphics processing units generate heat during operation and require proper cooling to achieve the best performance. In order to keep the graphics processing unit and other electronic components operating at a proper temperature, a liquid cooling device or an air cooling device is usually used. 
     In the current water-cooling heat dissipation device, the working fluid flows into the cold plate through the pipeline, and the cold plate contacts the surface of the electronic component, e.g. the graphics processing unit, to take away the heat generated by the electronic component during operation, thereby reducing the operating temperature of the electronic component, and improving the working efficiency of the display cards. 
     Therefore, there is a need to improve the performance and efficiency of the water-cooling heat dissipation devices so as to improve the performance and efficiency of the display cards, which is also a challenge currently faced by those skilled in the art. 
     SUMMARY 
     One objective of the embodiments of the present invention is to provide a liquid cooling device to effectively improve the cooling efficiency thereof as well as effectively improve the performance and efficiency of the electronic devices such as the display cards. 
     To achieve these and other advantages and in accordance with the objective of the embodiments of the present invention, as the embodiment broadly describes herein, the embodiments of the present invention provides a liquid cooling device, a water cooling radiator, a first pump, and a cold plate. The water cooling radiator includes a first surface and a second surface, and the first surface and the second surface are respectively located on opposite sides of the water cooling radiator. The first pump is disposed on the first surface or the second surface of the water cooling radiator, and the cold plate is disposed on the second surface of the water cooling radiator. 
     In some embodiments, the water cooling radiator further includes a first water tank, a second water tank, a third water tank, a plurality of heat radiating fins and a plurality of water flow paths. The heat radiating fins are disposed between the first water tank, the second water tank and the third water tank, and the water flow paths pass through in the heat radiating fins. 
     In some embodiments, the liquid cooling device further includes a second pump, and the first pump is fixed and communicated with the first water tank and the second pump is fixed and communicated with the second water tank. 
     In some embodiments, the liquid cooling device further includes at least one cooling fan disposed on the first surface or the second surface of the water cooling radiator, and located adjacent to the first pump. 
     In some embodiments, the liquid cooling device further includes a first cooling fan and a second cooling fan. The first cooling fan is disposed on the first surface or the second surface of the water cooling radiator, and located adjacent to the first pump. In addition, the second cooling fan is disposed on the first surface or the second surface of the water cooling radiator, and located adjacent to the second pump. 
     In some embodiments, the first pump and the first cooling fan are disposed on the first surface of the water cooling radiator, and the second pump and the second cooling fan are also disposed on the first surface of the water cooling radiator. 
     In some embodiments, the first pump and the first cooling fan are disposed on the second surface of the water cooling radiator, and the second pump and the second cooling fan are also disposed on the second surface of the water cooling radiator. 
     In some embodiments, the first pump and the first cooling fan are disposed on the second surface of the water cooling radiator, and the second pump and the second cooling fan are disposed on the first surface of the water cooling radiator. In addition, two ends of the water cooling radiator include a step. 
     In some embodiments, the liquid cooling device further includes a third pump fixed and communicated with the third water tank. The first pump, the first cooling fan, the second pump, the second cooling fan and the third pump are disposed on the first surface of the water cooling radiator, and the first cooling fan is located between the first pump and the third pump, and the second cooling fan is located between the second pump and the third pump. 
     In some embodiments, the first pump is fixed and communicated with the third water tank, and the first pump is disposed on the first surface of the water cooling radiator, and located between a first cooling fan and a second cooling fan. 
     In some embodiments, the third water tank includes a first partition plate and a second partition plate. The second partition plate and the first partition plate separate the third water tank into three areas, wherein a first water inlet and a first water outlet of the cold plate are respectively connected to two corresponding areas of the three areas, and another area of the three areas is connected to the first pump and disconnected from the cold plate. 
     In some embodiments, the heat radiating fins include a plurality of first heat radiating fins, a plurality of second heat radiating fins and a plurality of third heat radiating fins. The second heat radiating fins are formed between the first heat radiating fins and the third heat radiating fins, and the first heat radiating fins, the second heat radiating fins and the third heat radiating fins have different intervals. 
     In some embodiments, an interval of the first heat radiating fins is smaller than an interval of the second heat radiating fins, and the interval of the second heat radiating fins is smaller than an interval of the third heat radiating fins. 
     In some embodiments, the cold plate is connected to the third water tank. 
     In some embodiments, the third water tank includes a first partition plate to separate the third water tank into two areas. 
     In some embodiments, the cold plate includes a first chamber and first skived fins. The first chamber includes a first water inlet and a first water outlet, and the first water inlet and the first water outlet are respectively connected to corresponding areas of the two areas of the third water tank. In addition, the first skived fins are disposed in the first chamber, and located between the first water inlet and the first water outlet. 
     In some embodiments, the third water tank further includes a second partition plate, and the second partition plate and the first partition plate are formed a cross partition plate to separate the third water tank into four areas. In addition, the cold plate further includes a second chamber, a chamber partition plate and second skived fins. The second chamber includes a second water inlet and a second water outlet, and the first water inlet, the first water outlet, the second water inlet and the second water outlet are respectively connected to corresponding areas of the four areas of the third water tank. The chamber partition plate is formed between the first chamber and the second chamber to isolate the first chamber and the second chamber. In addition, the second skived fins is disposed in the second chamber, and located between the second water inlet and the second water outlet. 
     Hence, the aforementioned liquid cooling device can provide a larger heat dissipation area of the water cooling radiator without increasing the length, width and height of the liquid cooling device, and further improve the heat dissipation efficiency of the liquid cooling device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing aspects and many of the attendant advantages of this invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
         FIG.  1    illustrates a schematic view showing a liquid cooling device according to one embodiment of the present invention; 
         FIG.  2    illustrates a schematic exploded view of the liquid cooling device of  FIG.  1   ; 
         FIG.  3    illustrates a schematic exploded view showing a liquid cooling device according to another embodiment of the present invention; 
         FIG.  4    illustrates a schematic exploded view showing a liquid cooling device according to further another embodiment of the present invention; 
         FIG.  5    illustrates a schematic exploded view showing a liquid cooling device according to still further another embodiment of the present invention; 
         FIG.  6    illustrates a schematic view showing a bottom plate of a cold plate of the liquid cooling device of  FIG.  5   ; 
         FIG.  7    illustrates a schematic view showing various configuration embodiments of cooling fans, water cooling radiators and pumps of the liquid cooling device; and 
         FIG.  8    illustrates a schematic view showing a water cooling radiator of a liquid cooling device according to one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following description is of the best presently contemplated mode of carrying out the present disclosure. This description is not to be taken in a limiting sense but is made merely for the purpose of describing the general principles of the invention. The scope of the invention should be determined by referencing the appended claims. 
       FIG.  1    illustrates a schematic view of a liquid cooling device according to one embodiment of the present invention, and  FIG.  2    illustrates a schematic exploded view thereof.  FIG.  3    illustrates another embodiment of a liquid cooling device according to the present invention,  FIG.  4    illustrates further another embodiment thereof,  FIG.  5    illustrates still further another embodiment thereof,  FIG.  6    illustrates a bottom plate of a cold plate of the liquid cooling device of  FIG.  5   . In addition,  FIG.  7    illustrates various configuration embodiments of cooling fans, water cooling radiators and pumps of the liquid cooling device, and  FIG.  8    illustrates another embodiment of the water cooling radiator of the liquid cooling device. 
     Refer to  FIG.  1   , the liquid cooling device  100  includes a water cooling radiator  130 , at least one first pump  110  and a cold plate  140 . The water cooling radiator  130  includes a first surface  101  and a second surface  102 , and the first surface  101  and the second surface  102  are respectively located on opposite sides of the water cooling radiator  130 . In addition, the cold plate  140  is disposed on the second surface  102  of the water cooling radiator  130 . That is to say, the cold plate  140  is adjacent to the second surface  102  of the water cooling radiator  130 , and the first surface  101  is another surface of the water cooling radiator  130  opposite to the cold plate  140 . 
     In some embodiments, the first pump  110  is disposed on the first surface  101  of the water cooling radiator  130 . In some embodiment, the first pump  110  can be disposed on the second surface  102  of the water cooling radiator  130 , without departing from the spirit and scope of the present invention. 
     In some embodiments, the water cooling radiator  130  further includes a first water tank  132 , a second water tank  134 , a third water tank  136 , a plurality of heat radiating fins  138  and a plurality of water flow paths  139 . The first water tank  132  is disposed on the left side of the water cooling radiator  130  in  FIG.  1   , the second water tank  134  is disposed on the right side of the water cooling radiator  130 , and the third water tank  136  is located between the first water tank  132  and the second water tank  134 . The heat radiating fins  138  are disposed between the first water tank  132 , the second water tank  134  and the third water tank  136 , and the water flow paths  139  pass through in the heat radiating fins  138  so as to carry the heat in the working fluid through the water flow paths  139  to the heat radiating fins  138 , and remove the heat by cooling fans. 
     In some embodiments, the water flow paths  139  are flat water flow pipes to increase the contact area with the heat radiating fins  138  and reduce the shading area affecting the heat radiating fins  138 . 
     In some embodiments, the liquid cooling device  100  further includes a second pump  120 , and the first pump  110  is fixed and communicated with the first water tank  132 , and the second pump  120  is fixed and communicated with the second water tank  134 . 
     Further refer to  FIG.  2   . The liquid cooling device  100  can utilize the first pump  110  to draw the hot water, exhausted from the cold plate  140 , from the third water tank  136  through corresponding water flow paths  139 , to reduce the temperature of the hot water with the heat radiating fins  138 , then entering into the first water tank  132 , passing through the first pump  110 , the first water tank  132  and corresponding water flow paths  139  to further reduce the temperature thereof, and then re-entering the cold plate  140  through the third water tank  136  so as to dissipate the heat of the electronic components such as graphics chips. 
     The cold plate  140  includes a top cover  142  and a bottom plate  144 , and a first water inlet  201  and a first water outlet  202  are formed on the top cover  142 . The bottom plate  144  includes a first chamber  290  and first skived fins  260 . 
     Similarly, the liquid cooling device  100  may further utilize the second pump  120  to draw the hot water, exhausted from the cold plate  140 , from the third water tank  136 , through the corresponding water flow paths  139 , to reduce the temperature of the hot water with the heat radiating fins  138 , then entering into the second water tank  134 , passing through the second pump  120 , the second water tank  134  and corresponding water flow paths  139  to further reduce the temperature thereof, and then re-entering the cold plate  140  through the third water tank  136  so as to dissipate the heat of the electronic components such as graphics chips. 
     That is to say, the first pump  110  located on the left side may draw the working fluid from the third water tank  136  to the first water inlet  201  through the water flow paths  139  passing through in the heat radiating fins  138 , and draw the working fluid back from the first water outlet  202  to exchange the heat of the first skived fins  260  in the first chamber  290  so as to cool the electronic components such as graphics chips. In addition, the second pump  120  located on right side may draw the working fluid from the third water tank  136  to the first water inlet  201  through the water flow paths  139  passing through in the heat radiating fins  138 , and draw the working fluid back from the first water outlet  202  to simultaneously exchange the heat of the first skived fins  260  in the first chamber  290  so as to further cool the electronic components such as graphics chips. The first water tank  132 , the second water tank  134  and the third water tank  136  respectively include first partition plates  203  to respectively separate the first water tank  132 , the second water tank  134  and the third water tank  136  into two areas. 
     Therefore, the liquid cooling device  100  may utilize the first pump  110  and the second pump  120  both disposed on the first surface  101  of the water cooling radiator  130  to cool the working fluid in two directions to effectively improve the heat dissipation efficiency of the liquid cooling device  100 . In addition, the first pump  110  and the second pump  120  may not influence the length and width of the water cooling radiator  130  because that the first pump  110  and the second pump  120  are both disposed on the first surface  101  of the water cooling radiator  130 . 
     Referring to  FIG.  3   , another embodiment of the liquid cooling device is illustrated. The liquid cooling device  300  includes a water cooling radiator  330 , a first pump  310  and a cold plate  340 . The cold plate  340  is disposed on a second surface  102  of the water cooling radiator  330 . In addition, the first pump  310  is disposed on a first surface  101  of the water cooling radiator  330 . The water cooling radiator  330  includes a first water tank  332 , a second water tank  334 , a third water tank  336 , a plurality of heat radiating fins  338  and a plurality of water flow paths  339 . The water flow paths  339  pass through in the heat radiating fins  338  and connect the first water tank  332 , the second water tank  334  and the third water tank  336 . The cold plate  340  and the first pump  310  are disposed on and communicate with the third water tank  336 , the working fluid is circulated through the first pump  310 , and the heat in the working fluid is transferred to the heat radiating fins  338 , and then removed by the cooling fans. 
     The cold plate  340  includes a top cover  342  and a bottom plate  344 , a first water inlet  301  and a first water outlet  302  formed on the top cover  342 . The bottom plate  344  includes a first chamber  390  and first skived fins  360 . In addition, the third water tank  336  includes a first partition plate  303  and a second partition plate  304  therein, and the first partition plate  303  and the second partition plate  304  separate the third water tank  336  into three areas. 
     That is to say, the first pump  310  disposed on the third water tank  336  located in the middle may draw the working fluid from a corresponding area of the third water tank  336  through the water flow paths  339 , passing through in the heat radiating fins  338 , to the first water inlet  301  of the cold plate  340  by way of another corresponding area of the third water tank  336 , and then entering into the first chamber  390  to exchange the heat of the first skived fins  360  in the first chamber  390  so as to cool the electronic components such as graphics chips. Subsequently, the working fluid is transported to the first water outlet  302  of the cold plate  340 , and draw back into further another corresponding area, corresponding to the first water outlet  302 , of the third water tank  336 . In addition, the working fluid is directly transported to the first water tank  332  through the water flow paths  339 , passing through in the heat radiating fins  338 , and transported to the second water tank  334  through the water flow paths  339 , passing through in the heat radiating fins  338 , and then returns back to the third water tank  336  through the water flow paths  339 , passing through in the heat radiating fins  338 . Further, the working fluid pumped by the first pump  310  is then transported to the cold plate  340  again. 
     That is to say, a first water inlet  301  and a first water outlet  302  of the cold plate  340  are respectively connected to two corresponding areas of the three areas of the third water tank  336 , and another area is only connected to the inlet of the first pump  310  and is not directly connected to the cold plate  340 . In addition, the first water inlet  301  of the cold plate  340  is communicated with the outlet of the first pump  310  through a corresponding area of the third water tank  336 . 
     In addition, refer to  FIG.  4   , further another embodiment of the liquid cooling device is illustrated. The liquid cooling device  400  includes a water cooling radiator  430 , a first pump  410 , a second pump  420 , a third pump  450  and a cold plate  440 . The cold plate  440  is disposed on a second surface  102  of the water cooling radiator  430 . The first pump  410 , the second pump  420  and the third pump  450  is disposed on the first surface  101  of the water cooling radiator  430 . In addition, the structure and function of the third pump  450  and the third water tank  436  are similar to those of the first pump  310  and the third water tank  336  as illustrated in  FIG.  3   . The structure and function of the first water tank  432  and the first pump  410  are similar to those of the first water tank  132  and the first pump  110  as illustrated in  FIG.  2   . The structure of the second water tank  434  and the second pump  420  is opposite to that of the first water tank  432  and the first pump  410 . In addition, the structure and function of the heat radiating fins  438 , the cold plate  440  and the water flow paths  439  are similar to those of the heat radiating fins  338 , the cold plate  340  and the water flow paths  339  as illustrated in  FIG.  3   . 
     That is to say, a first partition plate  403  and a second partition plate  404  are formed in the third water tank  436 , and the first partition plate  403  and the second partition plate  404  separate the third water tank  436  into three areas. In addition, the first water tank  432  and the second water tank  434  respectively include first partition plates  403  to respectively separate the first water tank  432  and the second water tank  434  into two areas. 
     In addition, the cold plate  440  includes a top cover  442  and a bottom plate  444 . A first water inlet  401  and a first water outlet  402  are formed on the top cover  442 . The bottom plate  444  includes a first chamber  490  and first skived fins  460 . 
     Therefore, the liquid cooling device  400  may simultaneously utilize three pumps to increase the flow velocity and flow rate of the working fluid, and the heat dissipation efficiency of the liquid cooling device  400 . 
     Referring to  FIG.  5    and  FIG.  6   , still further another embodiment of the liquid cooling device is illustrated. The liquid cooling device  500  includes a water cooling radiator  530 , a first pump  510 , a second pump  520  and a cold plate  540 . The cold plate  540  is disposed on the second surface  102  of the water cooling radiator  530 . The first pump  510  and the second pump  520  are disposed on the first surface  101  of the water cooling radiator  530 , but the present invention is not limited thereto. 
     The first pump  510  is fixed and communicated with the first water tank  532 , and the second pump  520  is fixed and communicated with the second water tank  534 . The third water tank  536  includes a cross partition plate  550  to separate the third water tank  536  into four areas respectively connecting to corresponding first water inlet  501 , first water outlet  502 , second water inlet  503  and second water outlet  504  of the cold plate  540 . The cold plate  540  includes a top cover  542  and a bottom plate  544 . The first water inlet  501 , the first water outlet  502 , the second water inlet  503  and the second water outlet  504  are formed on the top cover  542 . 
     In some embodiments, the cross partition plate  550  includes a first partition plate  551  and a second partition plate  552 . The second partition plate  552  is vertically cross-connected to the first partition plate  551  to form the cross partition plate  550 , and separate the third water tank  536  into four areas. In addition, the first water tank  532  and the second water tank  534  respectively include first partition plates  551  to respectively separate the first water tank  532  and the second water tank  534  into two areas. 
     Referring to  FIG.  6   , the bottom plate  544  includes a first chamber  690 , a second chamber  680 , a chamber partition plate  670 , first skived fins  660  and second skived fins  650 . The first chamber  690  includes a first water entrance channel  610  and a first water exit channel  620 , the second chamber  680  includes a second water entrance channel  630  and a second water exit channel  640  respectively corresponding to the first water inlet  501 , the first water outlet  502 , the second water inlet  503  and the second water outlet  504  of the top cover  542 . 
     Therefore, the first water entrance channel  610 , the first water exit channel  620 , the second water entrance channel  630  and the second water exit channel  640  are respectively connected to corresponding areas of the third water tank  536 . The chamber partition plate  670  is formed between the first chamber  690  and the second chamber  680  to separate the first chamber  690  and the second chamber  680 , the first skived fins  660  are disposed in the first chamber  690  and located between the first water entrance channel  610  and the first water exit channel  620 , and the second skived fins  650  is disposed in the second chamber  680  and located between the second water entrance channel  630  and the second water exit channel  640 . 
     Therefore, the first pump  510  located on the left side may transport the working fluid to the second water inlet  503  through the water flow paths  539 , passing through in the heat radiating fins  538 , and the working fluid is drawn back from the second water outlet  504  to exchange the heat of the second skived fins  650  in the second chamber  680  on the right side so as to cool the electronic components such as graphics chips. In addition, the second pump  520  located on the right side may transport the working fluid to the first water inlet  501 , and the working fluid is drawn back from the first water outlet  502  to exchange the heat of the first skived fins  660  of the first chamber  690  on the left side so as to cool the electronic components such as graphics chips. With two sets of skived fins, the heat dissipation efficiency of the liquid cooling device  500  can be further improved, and with two pumps located on the left and right sides, the heat exchange of the first skived fins  660  and the second skived fins  650  are performed respectively and may not interfere with each other and compete for the working fluid so as to provide more stable cooling capacity. In addition, the temperature distribution of the cold plate  540  may be adjusted to improve the cooling effect of the liquid cooling device  500  by adjusting the rotational speed and flow rate of the first pump  510  and the second pump  520  and/or the length and width of the first skived fins  660  and the second skived fins  650 . 
     Referring to  FIG.  7   , various configuration embodiments of cooling fans, water cooling radiators and pumps of the liquid cooling device are illustrated. The liquid cooling device may install the pumps on the first surface  101  or the second surface  102 , for example an air inlet surface or air outlet surface of the water cooling radiator  130 , and the pumps are not installed on the side wall of the of the water cooling radiator  130  so as to provide a larger heat dissipation area of the water cooling radiator under a same length and width. 
     It is worth noting that the liquid cooling device may be equipped with a plurality of cooling fans on the first surface  101  or the second surface  102  of the water cooling radiator  130  so that the heights of the cooling fans and the pumps are shared on the water cooling radiator  130  and the overall height of the liquid cooling device may not be increased. 
     The configuration between the cooling fans, the water cooling radiator, the cold plate and the pumps of the liquid cooling device will be described in the following five configuration embodiments, but the present invention is not limited thereto. 
     First, a first configuration embodiment  710  is illustrated, a liquid cooling device includes a first cooling fan  701  disposed adjacent to the first pump  110 , and a second cooling fan  702  disposed adjacent to the second pump  120 . The first pump  110  and the first cooling fan  701  are disposed on the first surface  101  of the water cooling radiator  130 , and the second pump  120  and the second cooling fan  702  are disposed on the first surface  101  of the water cooling radiator  130 . The cold plate  140  is disposed on the second surface  102  of the water cooling radiator  130 . 
     Further, in a second configuration embodiment  720 , the first pump  110  and the first cooling fan  701  of the liquid cooling device are disposed on the second surface  102  of the water cooling radiator  130 , and the second pump  120  and the second cooling fan  702  are disposed on the second surface  102  of the water cooling radiator  130 . In addition, the cold plate  140  is disposed on the second surface  102  of the water cooling radiator  130 , and is communicated with an enlarged third water tank  136 . In addition, the volume of the third water tank  136  is greater than the volume of the first water tank  132  and the volume of the third water tank  136  is also greater than the volume of the second water tank  134  so that the storage volume of the liquid cooling device for storing the working fluid is increased without increasing the height of the liquid cooling device. 
     In a third configuration embodiment  730  of the liquid cooling device, the first pump  110  and the first cooling fan  701  are disposed on the second surface  102  of the water cooling radiator  130 , and the second pump  120  and the second cooling fan  702  are disposed on the first surface  101  of the water cooling radiator  130 . In addition, the cold plate  140  is disposed on the second surface  102  of the water cooling radiator  130 , and is communicated with an enlarged third water tank  136 . In addition, the volume of the third water tank  136  is greater than the volume of the first water tank  132  and the volume of the third water tank  136  is also greater than the volume of the second water tank  134  so that the storage volume of the liquid cooling device for storing the working fluid is increased without increasing the height of the liquid cooling device. Furthermore, since the first pump  110  and the first cooling fan  701  are disposed on the second surface  102  of the water cooling radiator  130 , the second pump  120  and the second cooling fan  702  are disposed on the first surface  101  of the water cooling radiator  130 , and the left end and the right end of the water cooling radiator  130  includes a step therebetween so that the water cooling radiator  130  may match the components on various printed circuit board products with different appearances to improve the application field of the liquid cooling device. 
     Furthermore, in a fourth configuration embodiment  740  of the liquid cooling device, the liquid cooling device includes a first cooling fan  701  disposed adjacent to the first pump  110 , a second cooling fan  702  disposed adjacent to the second pump  120 , and a third pump  760  fixed and communicated with the third water tank  436 . The first pump  110 , the first cooling fan  701 , the second pump  120 , the second cooling fan  702  and the third pump  760  are all disposed on the first surface  101  of the water cooling radiator  130 , and the first cooling fan  701  is disposed between the first pump  110  and the third pump  760  and the second cooling fan  702  is disposed between the second pump  120  and the third pump  760 . The cold plate  140  is disposed on the second surface  102  of the water cooling radiator  130 . Therefore, the liquid cooling device may increase the flow velocity, the flow rate, and the heat dissipation capacity of the working fluid with more pumps. 
     Moreover, in a fifth configuration embodiment  750  of the liquid cooling device, the liquid cooling device is equipped with a single first pump  770  fixed and communicated with the third water tank  336 . In addition, the first pump  770  is disposed on the first surface  101  of the water cooling radiator  130  and located between the first cooling fan  701  and the second cooling fan  702 . 
     With the above-mentioned various configuration embodiments of the liquid cooling device, the pump may not affect the length, width and height of the liquid cooling device so as to maximize the dimensions of the water cooling radiator and improve the heat dissipation efficiency of the liquid cooling device. 
     In addition,  FIG.  8    illustrates another embodiment of a water cooling radiator of a liquid cooling device. The water cooling radiator  810  includes a first water tank  812  and a second water tank  814 , a plurality of first heat radiating fins  816 , a plurality of second heat radiating fins  818  and a plurality of third heat radiating fins  820  are equipped between the first water tank  812  and the second water tank  814 . The water flow path  822 , the water flow path  824  and the water flow path  826  are respectively communicated with the first water tank  812  and the second water tank  814 , and disposed in the first heat radiating fins  816 , the second heat radiating fins  818  and the third heat radiating fins  820  to remove the heat of the working fluid flowing in the water flow path  822 , the water flow path  824  and the water flow path  826  with the first heat radiating fins  816 , the second heat radiating fins  818  and the third heat radiating fins  820 . It is worth noting that the second heat radiating fins  818  are formed between the first heat radiating fins  816  and the third heat radiating fins  820 , and the first heat radiating fins  816 , the second heat radiating fins  818  and the third heat radiating fins  820  respectively include different intervals. 
     In some embodiments, the interval of the first heat radiating fins  816  is smaller than the interval of the second heat radiating fins  818 , and the interval of the second heat radiating fins  818  is smaller than the interval of the third heat radiating fins  820  so that the liquid cooling device may adjust the interval of the heat radiating fins to increase the heat dissipation efficiency of the liquid cooling device and reduce the working noise of the liquid cooling device according to the heat dissipation requirement of the liquid cooling device and the air intake of the cooling fan. 
     Accordingly, the liquid cooling device of the present invention can provide a larger heat dissipation area of the water cooling radiator without increasing the length, width and height of the liquid cooling device, and further improve the heat dissipation efficiency of the liquid cooling device. 
     As is understood by a person skilled in the art, the foregoing preferred embodiments of the present invention are illustrative of the present invention rather than limiting of the present invention. It is intended that various modifications and similar arrangements be included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.