Liquid delivery device and cooling unit

Abstract

The present invention provides a liquid delivery device and a cooling unit. The liquid delivery device suppresses pump idling. The liquid delivery device (100) of the present invention includes: a first housing (110) having a flow path (116); and a pump (120). The upstream flow path (116p), located upstream of the pump (120) and communicating with the pump inlet (120p), has a first flow path (116a), a second flow path (116b), a third flow path (116c), a fourth flow path (116d), a fifth flow path (116e), and a sixth flow path (116f) respectively located on one side of a first direction (+X direction), the other side of the first direction (-X direction), one side of a second direction (+Y direction), the other side of the second direction (-Y direction), one side of a third direction (+Z direction), and the other side of the third direction (-Z direction) relative to the pump inlet (120p).

Description

Technical Field

[0001] This invention relates to a liquid delivery device and a cooling unit. Background Technology

[0002] Liquid delivery devices that use pumps to deliver liquid are used in various devices. In one example, the liquid delivery device is used in a cooling device that uses a refrigerant cycle to cool a heat-generating component. The integration of a cold plate into a liquid delivery device with a pump is under investigation (Patent Document 1: U.S. Patent No. 7,325,591).

[0003] Patent Document 1 describes a liquid cooling heat dissipation device that arranges a pump (liquid drive unit) with an impeller and a cold plate inside a housing. In the liquid cooling heat dissipation device of Patent Document 1, heat from the heat source is absorbed by pumping liquid flowing in from the inlet to a cold plate mounted on the heat source. The liquid then flows through pipes to the heat dissipation fins to be cooled and returns to the liquid cooling heat dissipation device.

[0004] In the liquid cooling device of Patent Document 1, liquid sometimes evaporates from the pipes. In this case, if there is insufficient liquid around the pump, the pump may run dry, resulting in insufficient liquid circulation. Summary of the Invention

[0005] The present invention was made in view of the above-mentioned problems, and its object is to provide a liquid delivery device and a cooling unit that can suppress the idling of the pump.

[0006] An exemplary liquid delivery device of the present invention includes a first housing and a pump. The first housing has an inlet for liquid inflow, an outlet for liquid outflow, and a flow path connecting the inlet and the outlet. The pump is disposed in the flow path of the first housing and circulates the liquid. The pump has a pump inlet for liquid inflow and a pump outlet for liquid outflow. The flow path has: an upstream flow path located upstream of the pump and communicating with the pump inlet; and a downstream flow path located downstream of the pump and communicating with the pump outlet. The upstream flow path has: a first flow path located on one side of the pump inlet in a first direction; a second flow path located on the other side of the pump inlet in the first direction; a third flow path located on one side of the pump inlet in a second direction perpendicular to the first direction; a fourth flow path located on the other side of the pump inlet in the second direction; a fifth flow path located on one side of the pump inlet in a third direction perpendicular to both the first and second directions; and a sixth flow path located on the other side of the pump inlet in the third direction.

[0007] An exemplary cooling unit of the present invention includes: the liquid delivery device described above; an inflow pipe connected to the inlet of the liquid delivery device; an outflow pipe connected to the outlet of the liquid delivery device; and a radiator connected to at least one of the inflow pipe and the outflow pipe.

[0008] According to the illustrative invention, it is possible to suppress pump idling. Attached Figure Description

[0009] Figure 1A This is a schematic perspective view of the liquid delivery device according to the exemplary first embodiment.

[0010] Figure 1B This is a partial perspective view of the liquid delivery device according to the exemplary first embodiment.

[0011] Figure 2 This is a schematic exploded view of the liquid delivery device according to the exemplary first embodiment.

[0012] Figure 3A This is a schematic perspective view of the pump in the liquid delivery device of the exemplary first embodiment.

[0013] Figure 3B This is a schematic exploded perspective view of the pump in the liquid delivery device of the exemplary first embodiment.

[0014] Figure 3C This is a schematic cross-sectional view of the pump in the liquid delivery device of the exemplary first embodiment.

[0015] Figure 3D This is a schematic cross-sectional view of a first component, which includes a pump, in an exemplary liquid delivery device according to the first embodiment.

[0016] Figure 4A This is a schematic perspective view of the first component of the first housing in the exemplary liquid delivery device of the first embodiment, viewed from the +Z direction side.

[0017] Figure 4B This is a schematic perspective view of the first component of the first housing in the exemplary liquid delivery device of the first embodiment, viewed from the -Z direction side.

[0018] Figure 5 This is a schematic cross-sectional perspective view of the first component of the first housing in the liquid delivery device of the exemplary first embodiment.

[0019] Figure 6A This is a schematic diagram showing the first flow path and the second flow path of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0020] Figure 6B This is a schematic diagram showing the third and fourth flow paths of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0021] Figure 6CThis is a schematic diagram showing the fifth and sixth flow paths of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0022] Figure 7A This is a schematic diagram showing the first chamber and the second chamber of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0023] Figure 7B This is a schematic diagram showing the first connecting flow path and the second connecting flow path of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0024] Figure 7C This is a schematic diagram showing the third and fourth connecting flow paths of the upstream flow path of the first housing in the liquid delivery device of the exemplary first embodiment.

[0025] Figure 8A This is a schematic diagram of an exemplary liquid delivery device of the first embodiment, with the second outer side facing vertically upward.

[0026] Figure 8B This is a schematic diagram of an exemplary first embodiment of a liquid delivery device with the first outer side facing vertically upward.

[0027] Figure 9A This is a schematic diagram of an exemplary liquid delivery device of the first embodiment, with the third outer side facing vertically upward.

[0028] Figure 9B This is a schematic diagram of an exemplary liquid delivery device of the first embodiment, with the fourth outer side facing vertically upward.

[0029] Figure 10A This is a schematic diagram of an exemplary first embodiment of a liquid delivery device with the first outer main surface facing vertically upwards.

[0030] Figure 10B This is a schematic diagram of an exemplary liquid delivery device of the first embodiment, with the second outer main surface facing vertically upwards.

[0031] Figure 11 This is a schematic diagram of the cooling unit of the liquid delivery device according to the first embodiment, which is exemplary.

[0032] Figure 12A This is a schematic perspective view of the liquid delivery device according to the exemplary second embodiment.

[0033] Figure 12B This is a schematic partial perspective view of the liquid delivery device according to the exemplary second embodiment.

[0034] Figure 13This is a schematic exploded perspective view of the liquid delivery device according to the exemplary second embodiment.

[0035] Figure 14A This is a schematic perspective view of the first part of the first housing in the exemplary liquid delivery device of the second embodiment, viewed from the +Z direction side.

[0036] Figure 14B This is a schematic perspective view of the first part of the first housing in the exemplary liquid delivery device of the second embodiment, viewed from the -Z direction side.

[0037] Figure 15A This is a schematic diagram of an exemplary second embodiment of a liquid delivery device with the second outer side facing vertically upward.

[0038] Figure 15B This is a schematic diagram of an exemplary second embodiment of a liquid delivery device with the first outer side facing vertically upwards.

[0039] Figure 16A This is a schematic diagram of an exemplary second embodiment of a liquid delivery device with the third outer side facing vertically upward.

[0040] Figure 16B This is a schematic diagram of an exemplary liquid delivery device of the second embodiment, with the fourth outer side facing vertically upward.

[0041] Figure 17A This is a schematic diagram of an exemplary second embodiment of a liquid delivery device with the first outer main surface facing vertically upwards.

[0042] Figure 17B This is a schematic diagram of an exemplary second embodiment of a liquid delivery device with the second outer main surface facing vertically upwards.

[0043] Figure 18 This is a schematic diagram of the cooling unit of the liquid delivery device according to the second embodiment, which is an example. Detailed Implementation

[0044] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the drawings, the same or equivalent parts are labeled with the same reference numerals and are not described repeatedly. In this specification, for ease of understanding of the invention, mutually perpendicular X-axis, Y-axis, and Z-axis are sometimes described. Typically, any one of the X-axis, Y-axis, and Z-axis is parallel to the vertical direction, and the other two are parallel to the horizontal direction. However, the orientation of the X-axis, Y-axis, and Z-axis is not limited thereto.

[0045] First, refer to Figure 1A and Figure 1B The liquid delivery device 100 of the first embodiment will be described as an example. Figure 1AThis is a schematic perspective view of the liquid delivery device 100. Figure 1B This is a schematic partial perspective view of the liquid delivery device 100.

[0046] The liquid delivery device 100 delivers liquid sequentially. For example, the liquid delivery device 100 is used for liquid circulation. By sequentially delivering liquid through the liquid delivery device 100, liquid circulation is achieved.

[0047] In the liquid delivery device 100, the liquid being delivered can also be water. Alternatively, the liquid can also be a mixture. For example, the mixture can be a mixture of water and propylene glycol.

[0048] In addition, Figure 1A and Figure 1B In the liquid delivery device 100 shown, the pump 120 is located vertically, but the pump 120 may not be located vertically. The liquid delivery device 100 may also be oriented in a direction other than where the pump 120 is located vertically.

[0049] like Figure 1A and Figure 1B As shown, the liquid delivery device 100 has a first housing 110 and a pump 120. The first housing 110 has an inlet 112, an outlet 114, and a flow path 116. Liquid flows into the inlet 112. Liquid flows out from the outlet 114. The flow path 116 connects the inlet 112 and the outlet 114. Therefore, when liquid flows into the first housing 110 from the inlet 112, the liquid flows in the flow path 116 and flows out to the outside from the outlet 114. The pump 120 is disposed in the flow path 116 of the first housing 110. The liquid is circulated by the pump 120.

[0050] The first outer shell 110 has a generally rectangular parallelepiped shape. The first outer shell 110 has a first outer main surface 110a, a second outer main surface 110b, a first outer side surface 110c, a second outer side surface 110d, a third outer side surface 110e, and a fourth outer side surface 110f. The first outer side surface 110c and the second outer side surface 110d are connected to the first outer main surface 110a and the second outer main surface 110b, respectively. Furthermore, the third outer side surface 110e and the fourth outer side surface 110f are connected to the first outer main surface 110a, the second outer main surface 110b, the first outer side surface 110c, and the second outer side surface 110d, respectively. The first outer main surface 110a is located on the +Z direction side, and the second outer main surface 110b is located on the -Z direction side. The first outer side surface 110c is located on the -X direction side, and the second outer side surface 110d is located on the +X direction side. The third outer side 110e is located on the +Y direction side, and the fourth outer side 110f is located on the -Y direction side.

[0051] A recess 110p is provided on the first outer main surface 110a. The recess 110p is located on the -X direction side of the entire first outer main surface 110a. The pump 120 is disposed in the recess 110p of the first outer main surface 110a. The pump 120 can be embedded in the recess 110p of the first outer main surface 110a of the first housing 110.

[0052] In this specification, the X direction, Y direction, and Z direction are sometimes referred to as the first direction, the second direction, and the third direction, respectively. Furthermore, the +X direction side and the -X direction side are sometimes referred to as one side of the first direction and the other side of the first direction, respectively. Similarly, the +Y direction side and the -Y direction side are sometimes referred to as one side of the second direction and the other side of the second direction, and the +Z direction side and the -Z direction side are sometimes referred to as one side of the third direction and the other side of the third direction, respectively. Therefore, the first outer main surface 110a is located on the third direction side, and the second outer main surface 110b is located on the other side of the third direction. The second outer side surface 110d is located on the first direction side, and the first outer side surface 110c is located on the other side of the first direction. The third outer side surface 110e is located on the second direction side, and the fourth outer side surface 110f is located on the other side of the second direction.

[0053] Here, an inlet 112 is provided on the first outer main surface 110a of the first outer casing 110. The inlet 112 protrudes from the first outer main surface 110a in the +Z direction. In addition, an outlet 114 is provided on the second outer main surface 110b. The outlet 114 protrudes from the second outer main surface 110b in the -Z direction.

[0054] The pump 120 enables liquid circulation. The pump 120 has a pump inlet 120p and a pump outlet 120q. Liquid flows into the pump 120 from the pump inlet 120p. Additionally, liquid flows out from the pump outlet 120q. The pump inlet 120p and pump outlet 120q are located in a recess 110p on the first outer main surface 110a of the first housing 110.

[0055] Pump 120 is disposed in flow path 116 of first housing 110. Flow path 116 is formed in a region surrounded by a first outer main surface 110a, a second outer main surface 110b, a first outer side surface 110c, a second outer side surface 110d, a third outer side surface 110e, and a fourth outer side surface 110f of first housing 110. Flow path 116 has an upstream flow path 116p and a downstream flow path 116q. Upstream flow path 116p is located upstream of pump 120. Upstream flow path 116p communicates with pump inlet 120p. Liquid flowing in from inlet 112 flows to pump inlet 120p through upstream flow path 116p. Downstream flow path 116q is located downstream of pump 120. Downstream flow path 116q communicates with pump outlet 120q. The liquid flowing out from the pump outlet 120q flows to the outlet 114 through the downstream flow path 116q.

[0056] Here, the inlet 112 is located on the first outer main surface 110a, and the outlet 114 is located on the second outer main surface 110b. Therefore, the liquid flowing in from the inlet 112 on the first outer main surface 110a reaches the pump 120 through the upstream flow path 116p. The liquid pumped out by the pump 120 flows outward through the downstream flow path 116q from the outlet 114 on the second outer main surface 110b.

[0057] When liquid is delivered using the liquid delivery device 100, the liquid flows into the first housing 110 through a pipe connected to the inlet 112. Additionally, the liquid flows out of the first housing 110 through a pipe connected to the outlet 114. Thus, the liquid flows through the pipe connected to the liquid delivery device 100.

[0058] Liquid sometimes evaporates from the piping. Especially when using relatively inexpensive rubber tubing as piping, the amount of liquid circulating in the liquid delivery device 100 may decrease due to gradual evaporation from the piping. By reducing the amount of liquid, air may accumulate in the reduced space. When air enters the pump, the pump cannot circulate the liquid. According to the liquid delivery device 100 of the present invention, air does not enter the pump 120 first when the amount of circulating liquid decreases, thus suppressing the idling of the pump 120.

[0059] Next, refer to Figures 1A-2 The liquid delivery device 100 of the first embodiment will be described as an example. Figure 2 This is a schematic exploded perspective view of the liquid delivery device 100.

[0060] like Figure 2As shown, a recess 110p is provided on the first outer main surface 110a of the first housing 110. The pump 120 is inserted into the recess 110p. The shape of the recess 110p approximately matches the shape of the pump 120. The thickness (length along the Z-axis) of the pump 120 is smaller than the depth (length along the Z-axis) of the recess 110p.

[0061] The recess 110p of the first outer main surface 110a has a side surface 110pa and a bottom surface 110pb. The bottom surface 110pb has a normal parallel to the third direction (Z-axis direction).

[0062] The recess 110p has a first portion 110p1 and a second portion 110p2. The first portion 110p1 is connected to the second portion 110p2. The first portion 110p1 is located on the +Z direction side relative to the second portion 110p2. The first portion 110p1 is approximately cuboid in shape, and the second portion 110p2 is approximately cylindrical in shape. The inner diameter (length along the XY plane) of the first portion 110p1 is larger than the inner diameter (length along the XY plane) of the second portion 110p2.

[0063] Pump 120 has a first outer surface portion 120t1 and a second outer surface portion 120t2. The first outer surface portion 120t1 of pump 120 corresponds to the first portion 110p1 of recess 110p, and the second outer surface portion 120t2 of pump 120 corresponds to the second portion 110p2 of recess 110p.

[0064] In pump 120, a first outer surface portion 120t1 is connected to a second outer surface portion 120t2. The first outer surface portion 120t1 is located on the +Z direction side relative to the second outer surface portion 120t2. The first outer surface portion 120t1 has a generally cuboid shape, and the second outer surface portion 120t2 has a generally cylindrical shape. The outer diameter (length along the XY plane) of the first outer surface portion 120t1 is larger than the outer diameter (length along the XY plane) of the second outer surface portion 120t2.

[0065] The outer diameter (length along the XY plane) of the first outer surface portion 120t1 of pump 120 is approximately equal to or slightly smaller than the inner diameter (length along the XY plane) of the first portion 110p1 of recess 110p. Similarly, the outer diameter (length along the XY plane) of the second outer surface portion 120t2 of pump 120 is approximately equal to or slightly smaller than the inner diameter (length along the XY plane) of the second portion 110p2 of recess 110p.

[0066] The thickness (length along the Z-axis) of the first outer surface portion 120t1 of pump 120 is smaller than the thickness (length along the Z-axis) of the first portion 110p1 of recess 110p. For example, the thickness of the first outer surface portion 120t1 of pump 120 is less than half the thickness of the first portion 110p1 of recess 110p. The thickness (length along the Z-axis) of the second outer surface portion 120t2 of pump 120 is approximately equal to or slightly smaller than the thickness (length along the Z-axis) of the second portion 110p2 of recess 110p.

[0067] The first housing 110 has a first component 110v, a second component 110w, and a sealing component 110U. The first component 110v is a generally hollow box shape with an opening on one side (in this embodiment, the -Z direction side), and the second component 110w is a generally plate shape. The second component 110w is disposed close to the opening of the first component 110v. By arranging the second component 110w relative to the opening of the first component 110v, a flow path 116 of the liquid delivery device 100 is formed. However, the first component 110v and the second component 110w can be separated from each other. The first component 110v and the second component 110w can be separated along the XY plane.

[0068] A sealing member 110U is disposed between the first member 110v and the second member 110w. The sealing member 110U has an annular structure. The sealing member 110U is resilient. The sealing member 110U includes an O-ring. Alternatively, at least one of the first member 110v and the second member 110w may have a groove corresponding to the sealing member 110U formed at the portion in contact with the sealing member 110U.

[0069] The sealing member 110U can suppress liquid leakage from the space surrounded by the first member 110v and the second member 110w. The first housing 110 is composed of the first member 110v, the second member 110w and the sealing member 110U.

[0070] The first component 110v has a first outer main surface 110a and a majority of the first outer side surface 110c to the fourth outer side surface 110f. The second component 110w has a second outer main surface 110b and a portion of the first outer side surface 110c to the fourth outer side surface 110f.

[0071] Inlet 112 is provided in the first component 110v. Inlet 112 extends through the first component 110v. Specifically, inlet 112 is located on the +X direction side of the first component 110v along the X direction.

[0072] An outlet 114 is provided in the second component 110w. The outlet 114 extends through the second component 110w. Specifically, the outlet 114 is located approximately at the center of the second component 110w along the X direction. The outlet 114 is located below the recess 110p. A groove communicating with the outlet 114 may also be formed in the second component 110w.

[0073] Next, refer to Figures 1A to 3D The pump 120 in the liquid delivery device 100 will be described. Figure 3A This is a schematic 3D view of pump 120. Figure 3B This is a schematic exploded perspective view of pump 120. Figure 3C This is a sectional perspective view of pump 120. Figure 3D This is a schematic cross-sectional view of a pump 120 inserted into a recess 110p of the first component 110v.

[0074] like Figure 3A and Figure 3B As shown, the pump 120 includes a second housing 122, an impeller 124, a pump rotating shaft 126, and a motor 128. The impeller 124 is disposed within the pump chamber P, described later. Furthermore, the pump rotating shaft 126 is mounted on the shaft support 110ps of the first housing 110. Figure 4A The impeller 124 is supported by the pump rotating shaft 126 and rotates when the pump rotating shaft 126 rotates about its axis. The motor 128 causes the impeller 124 to rotate about the pump rotating shaft 126.

[0075] Pump 120 has a first outer surface portion 120t1 and a second outer surface portion 120t2. More specifically, second housing 122 has a first outer surface portion 120t1 and a second outer surface portion 120t2. The first outer surface portion 120t1 is located on the +Z direction side relative to the second outer surface portion 120t2.

[0076] like Figure 3B and Figure 3C As shown, the motor 128 has a rotor 128a, a stator 128b, and a yoke 128c. The rotor 128a is opposite to the stator 128b. The yoke 128c is mounted radially outward relative to the rotor 128a. The stator 128b is an armature that generates magnetic flux according to the drive current. The stator 128b has a generally annular structure centered on the pump rotation shaft 126.

[0077] When the motor 128 is driven, a drive current is supplied to the stator 128b from an external power source via a drive circuit (not shown). Based on the supply of the drive current, a magnetic flux is generated in the stator 128b, and a circumferential torque is generated through the magnetic repulsion and attraction between the stator 128b and the rotor 128a. As a result, the rotor 128a begins to rotate around the pump shaft 126.

[0078] Rotor 128a and yoke 128c are mounted on impeller 124. Therefore, when the liquid flows in pump chamber P (described later), rotor 128a and yoke 128c are immersed in the liquid together with impeller 124.

[0079] The stator 128b is disposed inside the second housing 122 and isolated from the pump chamber P. Therefore, the stator 128b is not wetted by the liquid when it flows in the flow path 116. The rotor 128a rotates according to the magnetic flux from the stator 128b. Therefore, as the rotor 128a rotates, the impeller 124 rotates.

[0080] like Figure 3D As shown, the pump 120 is inserted into the recess 110p of the first housing 110. As described above, the recess 110p of the first outer main surface 110a has a side surface 110pa and a bottom surface 110pb. The bottom surface 110pb has a normal along the third direction (Z-axis direction). The pump rotation shaft 126 extends parallel to the third direction (Z-axis direction). When the pump 120 is inserted into the recess 110p, the pump rotation shaft 126 is arranged parallel to the normal direction of the bottom surface 110pb of the recess 110p. Therefore, the pump 120 can rotate stably.

[0081] In the first component 110v, an opening 110pc is provided on the bottom surface 110pb of the recess 110p. The opening 110pc is located at the center of a generally circular shape. The opening 110pc functions as a pump inlet 120p.

[0082] Furthermore, in the first component 110v, a through hole 110h is provided at the boundary between the side surface 110pa and the bottom surface 110pb of the recess 110p. The through hole 110h is located on the bottom surface 110pb of the recess 110p on both the +X direction side and the -Y direction side. The through hole 110h functions as a pump outlet 120q.

[0083] A pump chamber P is formed between the first housing 110 and the second housing 122 of the pump 120 by mounting the pump 120 in the recess 110p of the first housing 110. The pump chamber P is located between the first housing 110 and the second housing 122. An impeller 124 is housed in the pump chamber P.

[0084] Pump inlet 120p and pump outlet 120q are located in pump chamber P. Pump inlet 120p is located at the center of the face of pump chamber P on the -Z direction side. Pump outlet 120q is located on the sides of pump chamber P on the +X and -Y directions side. Liquid flows into pump chamber P from pump inlet 120p of first housing 110. By rotating impeller 124, the liquid in pump chamber P is pushed out and flows out from pump outlet 120q of first housing 110.

[0085] Thus, the impeller 124 is housed in the pump chamber P located between the first housing 110 and the second housing 122. Therefore, by rotating the impeller 124 via the motor 128, the liquid can be circulated.

[0086] Next, refer to Figure 1~ Figure 5 The first component 110v in the liquid delivery device 100 will be described. Figure 4A This is a schematic three-dimensional view of the first component 110v, mainly viewed from the +Z direction side to the -Z direction side. Figure 4B This is a schematic three-dimensional view of the first component 110v, mainly viewed from the -Z direction side to the +Z direction side. Figure 5 This is a schematic cross-sectional perspective view of the first component 110v, cut along the XY plane.

[0087] like Figure 4A As shown, a recess 110p is provided on the first outer main surface 110a of the first component 110v. The shape of the recess 110p corresponds to the shape of the pump 120.

[0088] The recess 110p has a first portion 110p1 and a second portion 110p2. The first portion 110p1 is connected to the second portion 110p2. The first portion 110p1 is located on the +Z direction side relative to the second portion 110p2. A support for the pump rotating shaft 126 is provided at the center of the second portion 110p2. Figures 3A to 3D The shaft support portion 110ps protrudes from the bottom surface 110pb towards the +Z direction. The opening portion 110pc ( Figure 4B It is located on the -Z direction side of the shaft support section at 110ps.

[0089] A through hole 110h is provided on the bottom surface 110pb of the recess 110p. Specifically, the through hole 110h is located in the second part 110p2. The through hole 110h penetrates the bottom surface 110pb of the recess 110p. The through hole 110h is located on the +X direction side and the -Y direction side of the bottom surface 110pb of the recess 110p. Through the through hole 110h, the outer and inner sides of the first component 110v are penetrated along the Z direction.

[0090] Figure 4B The back surface of the first outer main surface 110a of the first component 110v is shown. (See diagram.) Figure 4B As shown, a protrusion 110r is provided on the first component 110v, corresponding to the recess 110p. The protrusion 110r is provided on the back side of the first outer main surface 110a. A flow path 116 is formed on the back side of the first outer main surface 110a.

[0091] In detail, the protrusion 110r has a first portion 110r1 corresponding to the first portion 110p1 of the recess 110p and a second portion 110r2 corresponding to the second portion 110p2 of the recess 110p. The first portion 110r1 is connected to the second portion 110r2. The second portion 110r2 is located on the -Z direction side relative to the first portion 110r1. The first portion 110r1 has a generally cuboid shape, and the second portion 110r2 has a generally cylindrical shape. The outer diameter (length along the XY plane) of the first portion 110r1 is larger than the outer diameter (length along the XY plane) of the second portion 110r2.

[0092] A slot 110s is provided in the protrusion 110r. The slot 110s is provided on the back side of the first outer main surface 110a. The protrusion 110r also includes a third portion 110r3 in which the slot 110s is provided. The third portion 110r3 is configured to span the first portion 110r1 and the second portion 110r2. Specifically, the third portion 110r3 is located on the +X direction side of the first portion 110r1 and the second portion 110r2.

[0093] Slit 110s is connected to through hole 110h. Through hole 110h and slit 110s constitute downstream flow path 116q in flow path 116. Figure 1B ).

[0094] In the first component 110v, the ends of the first outer side surface 110c to the fourth outer side surface 110f in the -Z direction are located closer to the end of the second part 110r2 of the protrusion 110r in the -Z direction. Therefore, the upstream flow path 116p has a flow path in the flow path 116 that communicates with the pump inlet 120p and is opposite to the pump 120 in the -Z direction. In this specification, the flow path in the upstream flow path 116p that communicates with the pump inlet 120p and is opposite to the pump 120 in the -Z direction is sometimes referred to as the intermediate flow path 116m.

[0095] like Figure 4B and Figure 5 As shown, the upstream flow path 116p also has a first chamber 116t and a second chamber 116k. The first chamber 116t is connected to the inlet 112. The first chamber 116t is located on the +X direction side relative to the pump 120. The second chamber 116k is located on the -X direction side relative to the pump 120. The volume of the first chamber 116t is larger than the volume of the intermediate flow path 116m. In addition, the length of the first chamber 116t along the X direction is larger than the length of the pump chamber P along the X direction.

[0096] The second chamber 116k is connected to the intermediate flow path 116m. The second chamber 116k is connected to the pump inlet 120p in the flow path 116. The volume of the second chamber 116k is larger than the volume of the intermediate flow path 116m.

[0097] The volume of the first chamber 116t is larger than that of the second chamber 116k. Because the volume of the first chamber 116t, which is connected to the inlet 112, is larger, even if a large amount of air flows into the flow path 116 from the inlet 112, the flow of air into the pump 120 can be suppressed.

[0098] The upstream flow path 116p has a first connecting flow path 116r and a second connecting flow path 116s. The first connecting flow path 116r connects the first tank chamber 116t and the second tank chamber 116k on one side of the second direction (+Y direction side). The second connecting flow path 116s connects the first tank chamber 116t and the second tank chamber 116k on the other side of the second direction (-Y direction side).

[0099] Thus, the first chamber 116t and the second chamber 116k are connected via the first connecting flow path 116r and the second connecting flow path 116s. Therefore, even if the orientation of the liquid delivery device 100 changes drastically, the liquid can flow smoothly into the flow path 116.

[0100] like Figure 5 As shown, the recess 110p is connected to the first outer side surface 110c via the connecting portion 110u on the -X direction side. The connecting portion 110u is located on the +Z direction side of the second chamber 116k.

[0101] In the liquid delivery device 100 of this embodiment, the downstream flow path 116q is formed only a portion of the pump 120 in the first housing 110 on the -Z direction side, while the upstream flow path 116p occupies most of the first housing 110. Therefore, even if the orientation of the liquid delivery device 100 changes, the pump 120 can be immersed in the liquid, thereby suppressing the idling of the pump 120.

[0102] Next, refer to Figures 6A to 6C For the upstream flow path 116p in the liquid delivery device 100 ( Figure 1B The following explanation is provided. Based on the pump inlet 120p, the upstream flow path 116p can be divided into the first flow path 116a, the second flow path 116b, the third flow path 116c, the fourth flow path 116d, the fifth flow path 116e, and the sixth flow path 116f.

[0103] like Figure 6A As shown, the first flow path 116a is the portion of the upstream flow path 116p located on the +X direction side relative to the pump inlet 120p. The second flow path 116b is the portion of the upstream flow path 116p located on the -X direction side relative to the pump inlet 120p.

[0104] The end of the first flow path 116a on one side (+X direction side) in the first direction is located closer to the end of the pump chamber P on the same side (+X direction side) in the first direction. Similarly, the end of the second flow path 116b on the other side (-X direction side) in the first direction is located closer to the end of the pump chamber P on the other side (-X direction side) in the first direction.

[0105] like Figure 6B As shown, the third flow path 116c is the portion of the upstream flow path 116p located on the +Y direction side relative to the pump inlet 120p. The fourth flow path 116d is the portion of the upstream flow path 116p located on the -Y direction side relative to the pump inlet 120p.

[0106] The end of the third flow path 116c on one side (+Y direction side) in the second direction is located closer to the end of the pump chamber P on the other side (+Y direction side) in the second direction. The end of the fourth flow path 116d on the other side (-Y direction side) in the second direction is located closer to the end of the pump chamber P on the other side (-Y direction side) in the second direction.

[0107] like Figure 6C As shown, the fifth flow path 116e is the portion of the upstream flow path 116p located on the +Z direction side relative to the pump inlet 120p. The sixth flow path 116f is the portion of the upstream flow path 116p located on the -Z direction side relative to the pump inlet 120p.

[0108] The end of the fifth flow path 116e on one side (+Z direction side) in the third direction is located closer to the end of the pump chamber P on the same side (+Z direction side) in the third direction. The end of the sixth flow path 116f on the other side (-Z direction side) in the third direction is located closer to the end of the pump chamber P on the same side (-Z direction side) in the third direction. Therefore, regardless of the orientation of the liquid delivery device 100, air accumulation in the pump chamber P can be prevented.

[0109] Thus, the upstream flow path 116p has: a first flow path 116a, which is located on one side of the first direction (+X direction side) relative to the pump inlet 120p; a second flow path 116b, which is located on the other side of the first direction (-X direction side) relative to the pump inlet 120p; a third flow path 116c, which is located on one side of the second direction (+Y direction side) relative to the pump inlet 120p perpendicular to the first direction; a fourth flow path 116d, which is located on the other side of the second direction (-Y direction side) relative to the pump inlet 120p; a fifth flow path 116e, which is located on one side of the third direction (+Z direction side) relative to the pump inlet 120p perpendicular to both the first and second directions; and a sixth flow path 116f, which is located on the other side of the third direction (-Z direction side) relative to the pump inlet 120p. Therefore, regardless of the orientation of the liquid delivery device 100, air flow into the pump 120 can be suppressed, thereby suppressing the idling of the pump 120.

[0110] Furthermore, the ends of each of the first flow paths 116a to the sixth flow path 116f are located further away than the end corresponding to the pump chamber P. Therefore, regardless of the orientation of the liquid delivery device 100, air accumulation in the pump chamber P can be prevented.

[0111] Next, refer to Figures 1A to 7C For the upstream flow path 116p in the liquid delivery device 100 ( Figure 1B The following explanation is provided. Based on the pump chamber P, the upstream flow path 116p can be divided into the first tank chamber 116t, the second tank chamber 116k, the first connecting flow path 116r, the second connecting flow path 116s, the third connecting flow path 116u, and the fourth connecting flow path 116w.

[0112] like Figure 7A As shown, the first tank chamber 116t is located on the +X direction side relative to the pump chamber P in the upstream flow path 116p. The second tank chamber 116k is located on the -X direction side relative to the pump chamber P in the upstream flow path 116p.

[0113] The lengths of the first chamber 116t and the second chamber 116k along the Y direction are greater than the length of the pump chamber P along the Y direction. Additionally, the lengths of the first chamber 116t and the second chamber 116k along the Z direction are greater than the length of the pump chamber P along the Z direction.

[0114] As described above, the first chamber 116t is connected to the inlet 112. The first chamber 116t has at least a portion of the first flow path 116a, at least a portion of the third flow path 116c, at least a portion of the fourth flow path 116d, at least a portion of the fifth flow path 116e, and at least a portion of the sixth flow path 116f. Through the first chamber 116t connected to the inlet 112, even if air flows into the flow path 116 from the inlet 112, air flow into the pump 120 can be suppressed.

[0115] Furthermore, as described above, the second chamber 116k is located on the opposite side of the first chamber 116t relative to the pump chamber P. The second chamber 116k has at least a portion of the second flow path 116b, at least a portion of the third flow path 116c, at least a portion of the fourth flow path 116d, at least a portion of the fifth flow path 116e, and at least a portion of the sixth flow path 116f. Through the second chamber 116k, even if the posture of the liquid delivery device 100 changes, air inflow into the pump 120 can be suppressed.

[0116] like Figure 7B As shown, the first connecting flow path 116r is located on the +Y direction side relative to the pump chamber P in the upstream flow path 116p. The second connecting flow path 116s is located on the -Y direction side relative to the pump chamber P in the upstream flow path 116p.

[0117] The lengths of the first connecting flow path 116r and the second connecting flow path 116s along the X direction are greater than the length of the pump chamber P along the X direction. Additionally, the lengths of the first connecting flow path 116r and the second connecting flow path 116s along the Z direction are greater than the length of the pump chamber P along the Z direction.

[0118] like Figure 7C As shown, the third connecting flow path 116u is located on the +Z direction side relative to the pump chamber P in the upstream flow path 116p. The fourth connecting flow path 116w is located on the -Z direction side relative to the pump chamber P in the upstream flow path 116p. The length of the third connecting flow path 116u along the Z direction is greater than the length of the pump chamber P along the Z direction. Furthermore, the length of the fourth connecting flow path 116w along the Z direction is greater than the length of the pump chamber P along the Z direction.

[0119] Furthermore, the lengths of the third connecting flow path 116u and the fourth connecting flow path 116w along the X direction are greater than the length of the pump chamber P along the X direction. Additionally, the lengths of the third connecting flow path 116u and the fourth connecting flow path 116w along the Y direction are greater than the length of the pump chamber P along the Y direction.

[0120] Next, refer to Figures 8A to 10B The liquid delivery device 100 will be described. Figures 8A to 10B In the middle, the liquid delivery device 100 exhibits different postures. Figure 8A This is a schematic diagram of the liquid delivery device 100 facing vertically upwards on the second outer side 110d. Figure 8B This is a schematic diagram of the liquid delivery device 100 facing vertically upwards on the first outer side 110c. Figure 9A This is a schematic diagram of the liquid delivery device 100 facing vertically upwards on the third outer side 110e. Figure 9B This is a schematic diagram of the liquid delivery device 100 facing vertically upwards on the fourth outer side 110f. Figure 10AThis is a schematic diagram of the liquid delivery device 100 with the first outer main surface 110a facing vertically upwards. Figure 10B This is a schematic diagram of the liquid delivery device 100 with the second outer main surface 110b facing vertically upward.

[0121] like Figure 8A As shown, when the second outer side 110d of the liquid delivery device 100 in the +X direction faces vertically upward, the first flow path 116a of the flow path 116 is located above the pump chamber P. Therefore, with the second outer side 110d facing vertically upward, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the first flow path 116a. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0122] like Figure 8B As shown, with the first outer side 110c of the liquid delivery device 100 facing vertically upwards in the -X direction, the second flow path 116b of the flow path 116 is located above the pump chamber P. Therefore, with the first outer side 110c facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the second flow path 116b. Therefore, it is possible to suppress air bubbles from flowing into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0123] like Figure 9A As shown, with the third outer side 110e of the liquid delivery device 100 facing vertically upwards in the +Y direction, the third flow path 116c of the flow path 116 is located above the pump chamber P. Therefore, with the third outer side 110e facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the third flow path 116c. Therefore, it is possible to suppress air bubbles from flowing into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0124] like Figure 9B As shown, with the fourth outer side 110f of the liquid delivery device 100 facing vertically upwards in the -Y direction, the fourth flow path 116d of the flow path 116 is located above the pump chamber P. Therefore, with the fourth outer side 110f facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the fourth flow path 116d. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0125] like Figure 10AAs shown, with the first outer main surface 110a in the +Z direction of the liquid delivery device 100 facing vertically upwards, the fifth flow path 116e of the flow path 116 is located above the pump chamber P. Therefore, with the first outer main surface 110a facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the fifth flow path 116e. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0126] like Figure 10B As shown, with the second outer main surface 110b in the -Z direction of the liquid delivery device 100 facing vertically upwards, the sixth flow path 116f of the flow path 116 is located above the pump chamber P. Therefore, with the second outer main surface 110b facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the sixth flow path 116f. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0127] Next, refer to Figure 11 The cooling unit 200 will be described. Figure 11 This is a schematic perspective view of the cooling unit 200.

[0128] like Figure 11 As shown, the cooling unit 200 includes an exemplary liquid delivery device 100, piping 210, radiator 220, and cold plate 230 according to the first embodiment. The cooling unit 200 circulates liquid as a refrigerant. Liquid is sequentially delivered through the liquid delivery device 100, and the liquid circulates in the cooling unit 200.

[0129] The liquid delivery device 100, radiator 220, and cold plate 230 are connected via piping 210. The liquid delivery device 100 delivers liquid supplied via piping 210 toward the radiator 220. The liquid delivered from the liquid delivery device 100 flows through piping 210 to the radiator 220. The radiator 220 releases heat from the liquid flowing in piping 210 to the outside, thus cooling the liquid within piping 210.

[0130] Pipe 210 is cylindrical. For example, pipe 210 is formed of resin. In one example, pipe 210 is a rubber hose.

[0131] Typically, the cold plate 230 is positioned near the heat source. For example, the cold plate 230 may be positioned opposite the heat source. Alternatively, the cold plate 230 may be positioned in contact with the heat source. As the liquid cooled in the radiator 220 flows through the cold plate 230, heat from the heat source is absorbed by the liquid inside the cold plate 230. The liquid that has passed through the cold plate 230 then returns to the liquid delivery device 100 and is again delivered to the piping 210.

[0132] Piping 210 has an inlet pipe 212, an outlet pipe 214, and a connecting pipe 216. The inlet pipe 212 is connected to the inlet 112 of the liquid delivery device 100. The inlet pipe 212 connects the cold plate 230 and the inlet 112 of the liquid delivery device 100. Liquid that has absorbed heat in the cold plate 230 flows toward the liquid delivery device 100 through the inlet pipe 212.

[0133] Outflow pipe 214 is connected to outlet 114 of liquid delivery device 100. Outflow pipe 214 connects liquid delivery device 100 and radiator 220. Liquid delivered from liquid delivery device 100 flows towards radiator 220 through outflow pipe 214. Heat is released from the liquid through radiator 220. Therefore, the liquid is cooled in radiator 220.

[0134] Connecting pipe 216 connects radiator 220 and cold plate 230. Liquid cooled in radiator 220 flows toward cold plate 230 through connecting pipe 216. In cold plate 230, liquid absorbs heat from a heat source. Liquid that has absorbed heat in cold plate 230 flows toward liquid delivery device 100 through inflow pipe 212. Then, the liquid is again delivered in liquid delivery device 100, circulating through outflow pipe 214, radiator 220, connecting pipe 216, cold plate 230, and inflow pipe 212.

[0135] In addition, in reference Figure 11 In the above description, the liquid delivery device 100 of the exemplary first embodiment supplies liquid to the cold plate 230, but this embodiment is not limited to this. The cold plate may also be disposed within the liquid delivery device.

[0136] Next, refer to Figures 12A to 18 The liquid delivery device 100 of the exemplary second embodiment will be described. The liquid delivery device 100 of the exemplary second embodiment differs from the liquid delivery device 100 of the exemplary first embodiment in that the outlet 114 is provided on the first outer main surface 110a, and the liquid delivery device 100 also includes a cold plate 130, a partition plate 140, and an elastic member 150. In the description of the liquid delivery device 100 of the exemplary second embodiment, details that are repeated with those of the liquid delivery device 100 of the exemplary first embodiment are omitted to avoid redundancy.

[0137] Figure 12AThis is a schematic perspective view of the liquid delivery device 100. Figure 12B This is a schematic partial perspective view of the liquid delivery device 100. The liquid delivery device 100 of the second embodiment is used for cooling a heat-generating component.

[0138] Typically, the liquid delivery device 100 is installed on the heating element. The liquid flowing into the liquid delivery device 100 absorbs heat from the heating element. Then, the liquid flows out of the liquid delivery device 100 to the outside. Through the liquid delivery device 100, heat from the heating element can be absorbed.

[0139] In addition, Figure 12A and Figure 12B In this configuration, the +Z axis side of the liquid delivery device 100 faces vertically upwards, but the +Z axis side of the liquid delivery device 100 may not face vertically upwards. Regarding the orientation of the liquid delivery device 100, the surface other than the +Z axis side may also face vertically upwards.

[0140] like Figure 12A and Figure 12B As shown, an inlet 112 and an outlet 114 are provided on the first outer main surface 110a of the first housing 110. The inlet 112 and the outlet 114 protrude from the first outer main surface 110a in the +Z direction.

[0141] In addition to a first housing 110 and a pump 120, the liquid delivery device 100 also includes a cold plate 130, a partition plate 140, and an elastic member 150. The cold plate 130 is arranged in contact with the heating member. The cold plate 130 is disposed within the first housing 110. The cold plate 130 is located on the -Z direction side of the first housing 110. The cold plate 130 is disposed in the downstream flow path 116q. For example, the cold plate 130 is mounted on the second member 110w. The cold plate 130 is, for example, made of metal.

[0142] In the case where the liquid delivery device 100 cools the heating element, the heating element is mounted on the cold plate 130. Typically, the cold plate 130 is positioned near the heating element. For example, the cold plate 130 is positioned opposite the heating element.

[0143] For example, the liquid delivery device 100 can also cool electronic devices that have internal heat-generating elements. The liquid delivery device 100 can also cool the circuitry of the electronic device. Alternatively, the liquid delivery device 100 can also cool the light source or other components of the electronic device. For example, the electronic device can be any of a server, a projector, a laptop computer, or a two-dimensional display device.

[0144] The partition plate 140 is located between the pump 120 and the cold plate 130. If the partition plate 140 is installed on the first component 110v, the upstream flow path 116p inside the first housing 110 is separated from the partition plate 140 in the +Z direction. A slot 140s is provided on the partition plate 140, and the slot 140s communicates with the pump outlet 120q. The slot 140s forms part of the downstream flow path 116q.

[0145] The upstream flow path 116p has an intermediate flow path 116m at the position between the pump 120 and the partition plate 140, which is at least part of the sixth flow path 116f. Therefore, even if the orientation of the liquid delivery device 100 changes so that the other side of the third direction (-Z direction side) is vertically above, air inflow into the pump 120 can be suppressed by the intermediate flow path 116m.

[0146] The elastic member 150 is located between the cold plate 130 and the partition plate 140. The elastic member 150 can buffer the impact of the partition plate 140 on the cold plate 130.

[0147] Here, inlet 112 and outlet 114 are located on the first outer main surface 110a. Liquid flowing in from inlet 112 on the first outer main surface 110a reaches pump 120 through upstream flow path 116p.

[0148] The liquid pumped by pump 120 flows out to the outside through downstream flow path 116q and outlet 114. Specifically, the liquid pumped by pump 120 flows to cold plate 130 through partition plate 140 and elastic member 150. The liquid flowing to cold plate 130 absorbs heat from the heating element. Then, the liquid flows out to the outside through outlet 114.

[0149] A groove 110g communicating with a recess 110p on the first outer side surface 110c is provided. Therefore, a fifth flow path 116e can be provided and wiring for pump drive can be easily installed.

[0150] Next, refer to Figures 12A-13 The liquid delivery device 100 of the exemplary second embodiment will be described. Figure 13 This is a schematic exploded perspective view of the liquid delivery device 100.

[0151] like Figure 13 As shown, the liquid delivery device 100 has a first housing 110, a pump 120, a cold plate 130, a partition plate 140, and an elastic member 150. The cold plate 130, the partition plate 140, and the elastic member 150 are arranged in the space formed by the first member 110v and the second member 110w.

[0152] The cold plate 130 is mounted on the second component 110w. Typically, the cold plate 130 is mounted on the main surface of the second component 110w in the +Z direction, and the heating element is mounted on the main surface in the -Z direction. The cold plate 130 may also be finned.

[0153] A slit 140s is provided on the partition plate 140. Specifically, the slit 140s is located approximately at the center of the partition plate 140 along the X direction. The slit 140s extends along the Y direction.

[0154] The elastic member 150 is located between the cold plate 130 and the partition plate 140. The lengths of the elastic member 150 along the X direction and along the Y direction are approximately equal to the lengths of the cold plate 130 along the X direction and along the Y direction, respectively. Therefore, direct contact between the cold plate 130 and the partition plate 140 can be avoided.

[0155] A slot 150s is provided in the elastic member 150. Specifically, the slot 150s is located approximately at the center of the elastic member 150 along the X direction. The slot 150s extends along the Y direction. The slots 140s and 150s overlap each other and form part of the downstream flow path 116q.

[0156] In addition, although Figure 13 Not shown in the figure, but the outlet 114 extends along the -Z direction from the back side of the first outer main surface 110a of the first component 110v. Inside the first component 110v, the outlet 114 passes through the upstream flow path 116p inside the first component 110v and through the partition plate 140 and the elastic member 150.

[0157] Next, refer to Figure 14A and Figure 14B The first component 110v in the liquid delivery device 100 will be described. Figure 14A This is a schematic three-dimensional view of the first component 110v as viewed from the +Z direction side to the -Z direction side. Figure 14B This is a schematic three-dimensional view of the first component 110v as viewed from the -Z direction side to the +Z direction side.

[0158] like Figure 14A As shown, a recess 110p is provided on the first outer main surface 110a of the first component 110v. The recess 110p has a generally cylindrical shape. The shape of the recess 110p corresponds to the shape of the pump 120. A step 110pd is provided in the recess 110p. More specifically, the step 110pd is provided in the second portion 110p2 of the recess 110p. In the step 110pd of the recess 110p, the deeper the recess 110p (the further it advances along the -Z direction), the smaller the inner diameter of the recess 110p.

[0159] Figure 14BThe back surface of the first outer main surface 110a of the first component 110v is shown. (See diagram.) Figure 14B As shown, a protrusion 110r is provided on the first component 110v, corresponding to the recess 110p. The protrusion 110r is provided on the back side of the first outer main surface 110a. A flow path 116 is formed on the back side of the first outer main surface 110a.

[0160] In detail, the protrusion 110r has a first portion 110r1 corresponding to the first portion 110p1 of the recess 110p and a second portion 110r2 corresponding to the second portion 110p2 of the recess 110p. The first portion 110r1 is connected to the second portion 110r2. The second portion 110r2 is located on the -Z direction side relative to the first portion 110r1. The first portion 110r1 has a generally cuboid shape, and the second portion 110r2 has a generally cylindrical shape. The outer diameter (length along the XY plane) of the first portion 110r1 is larger than the outer diameter (length along the XY plane) of the second portion 110r2.

[0161] A step 110rd is provided in the protrusion 110r. The step 110rd of the protrusion 110r corresponds to the step 110pd of the recess 110p. Specifically, a step 110rd is provided in the second part 110r2 of the protrusion 110r. In the step 110rd of the protrusion 110r, the higher the protrusion 110r is (the further it advances along the -Z direction), the smaller the outer diameter of the protrusion 110r.

[0162] Furthermore, in the exemplary second embodiment of the liquid delivery device 100, the outlet 114 is located within the first tank chamber 116t. As described above, the outlet 114 extends through the partition plate 140 to the side of the second component 110w.

[0163] Next, refer to Figures 12A to 17B The liquid delivery device 100 will be described. Figures 15A to 17B In the middle, the liquid delivery device 100 exhibits different postures.

[0164] Figure 15A The liquid delivery device 100 is shown with the second outer side 110d facing vertically upward. Figure 15B The first outer side 110c is shown facing the liquid delivery device 100 vertically upward. Figure 16A The third outer side 110e is shown facing vertically upwards, with the liquid delivery device 100. Figure 16B The fourth outer side 110f is shown with the liquid delivery device 100 facing vertically upward. Figure 17A The liquid delivery device 100 is shown with its first outer main surface 110a facing vertically upwards. Figure 17B The second outer main surface 110b is shown facing the liquid delivery device 100 vertically upward.

[0165] like Figure 15A As shown, with the second outer side 110d of the liquid delivery device 100 facing vertically upwards in the +X direction, the first flow path 116a of the flow path 116 is located above the pump chamber P. Therefore, with the second outer side 110d facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the first flow path 116a. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0166] like Figure 15B As shown, with the first outer side 110c of the liquid delivery device 100 facing vertically upwards in the -X direction, the second flow path 116b of the flow path 116 is located above the pump chamber P. Therefore, with the first outer side 110c facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the second flow path 116b. Therefore, it is possible to suppress air bubbles from flowing into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0167] like Figure 16A As shown, with the third outer side 110e of the liquid delivery device 100 facing vertically upwards in the +Y direction, the third flow path 116c of the flow path 116 is located above the pump chamber P. Therefore, with the third outer side 110e facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the third flow path 116c. Therefore, it is possible to suppress air bubbles from flowing into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0168] like Figure 16B As shown, with the fourth outer side 110f of the liquid delivery device 100 facing vertically upwards in the -Y direction, the fourth flow path 116d of the flow path 116 is located above the pump chamber P. Therefore, with the fourth outer side 110f facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the fourth flow path 116d. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0169] like Figure 17AAs shown, with the first outer main surface 110a in the +Z direction of the liquid delivery device 100 facing vertically upwards, the fifth flow path 116e of the flow path 116 is located above the pump chamber P. Therefore, with the first outer main surface 110a facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the fifth flow path 116e. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0170] like Figure 17B As shown, with the second outer main surface 110b in the -Z direction of the liquid delivery device 100 facing vertically upwards, the sixth flow path 116f of the flow path 116 is located above the pump chamber P. Therefore, with the second outer main surface 110b facing vertically upwards, even if air bubbles flow into the flow path 116 of the first housing 110 of the liquid delivery device 100, the inflowing air bubbles will accumulate in the sixth flow path 116f. Therefore, it is possible to suppress the flow of air bubbles into the pump inlet 120p, and as a result, it is possible to suppress the idling of the pump 120.

[0171] The sixth flow path 116f is located between the pump 120 and the cold plate 130. By placing the cold plate 130, which contacts the heat-generating component, within the liquid delivery device 100, the overall size of the cooling unit 200 can be reduced. Even with this configuration, air accumulation in the pump chamber P can be suppressed regardless of the orientation of the liquid delivery device 100.

[0172] Next, refer to Figures 12A to 18 The cooling unit 200 will be described. Figure 18 This is a schematic diagram of the cooling unit 200. The exemplary second embodiment of the cooling unit 200 includes a liquid delivery device 100. The cooling unit 200 is used for cooling heat-generating components.

[0173] The cooling unit 200 includes a liquid delivery device 100, piping 210, and a radiator 220. The liquid delivery device 100 circulates the liquid. Liquid is sequentially delivered through the liquid delivery device 100, and the liquid circulates within the cooling unit 200.

[0174] The liquid delivery device 100 and the radiator 220 are connected via piping 210. The liquid delivery device 100 delivers liquid supplied via piping 210 toward the radiator 220. The liquid is transported from the liquid delivery device 100 to the radiator 220 via piping 210. The radiator 220 releases the heat of the liquid flowing in piping 210 to the outside, thus cooling the liquid within piping 210.

[0175] When the liquid cooled in the radiator 220 flows through the cold plate 130 of the liquid delivery device 100, the heat of the heating element is absorbed by the cold plate 130 and the liquid inside.

[0176] As described above, the liquid flows through pipe 210. During this time, the liquid sometimes evaporates from pipe 210. In particular, when using relatively inexpensive rubber tubing as pipe 210, if the cooling unit 200 is used for a long period, the amount of liquid circulating in the cooling unit 200 gradually decreases due to the gradual evaporation of liquid from pipe 210. According to the liquid delivery device 100, even if the amount of liquid circulating in the liquid delivery device 100 decreases, the idling of pump 120 can be suppressed.

[0177] Piping 210 has an inflow pipe 212 and an outflow pipe 214. The inflow pipe 212 and the outflow pipe 214 are respectively connected to the radiator 220 and the liquid delivery device 100. The radiator 220 is connected to at least one of the inflow pipe 212 and the outflow pipe 214. Here, the inflow pipe 212 is connected to the inlet 112 of both the radiator 220 and the liquid delivery device 100. Additionally, the outflow pipe 214 is connected to the outlet 114 of both the radiator 220 and the liquid delivery device 100.

[0178] Liquid that has absorbed heat from the heating element in the liquid delivery device 100 is discharged from the liquid delivery device 100 through the outlet pipe 214 toward the radiator 220. The heat of the liquid is released through the radiator 220. Therefore, the liquid is cooled in the radiator 220. Liquid can be supplied to the radiator 220 through the liquid delivery device 100.

[0179] The liquid cooled in radiator 220 flows toward liquid delivery device 100 through inflow pipe 212. In liquid delivery device 100, the liquid absorbs heat from the heating element. The liquid that has absorbed heat from the heating element in liquid delivery device 100 is pushed out again by liquid delivery device 100 and circulates again through outflow pipe 214 and inflow pipe 212.

[0180] According to the cooling unit 200 of this embodiment, since the liquid cooled in the radiator 220 can be supplied to the cold plate 130 of the liquid delivery device 100, the heat of the heat-generating component can be effectively absorbed. In addition, according to the cooling unit 200, the idling of the pump 120 can be suppressed regardless of the orientation of the liquid delivery device 100.

[0181] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above, and can be implemented in various ways without departing from its spirit. In addition, the various constituent elements disclosed in the above embodiments can be appropriately changed. For example, one of the constituent elements shown in one embodiment can be added to the constituent elements of other embodiments, or several constituent elements shown in one embodiment can be deleted from the embodiment.

[0182] Furthermore, for ease of understanding of the invention, the accompanying drawings are schematically shown with each constituent element as the main body. The thickness, length, number, spacing, etc. of each constituent element in the drawings may sometimes differ from the actual dimensions for the convenience of drawing production. In addition, the structure of each constituent element shown in the above-described embodiment is an example and is not particularly limited. Of course, various modifications can be made without substantially departing from the effects of the invention.

[0183] This invention is suitable, for example, for use in liquid delivery devices, cooling modules, and cooling units.

Claims

1. A liquid feeding device, comprising: a first housing having a flow inlet through which a liquid flows in, a flow outlet through which the liquid flows out, and a flow path connecting the flow inlet and the flow outlet; and a pump disposed in the flow path of the first housing and circulating the liquid, the pump having a pump flow inlet through which the liquid flows in and a pump flow outlet through which the liquid flows out, the flow path having: an upstream side flow path located at a position more upstream than the pump and communicating with the pump flow inlet, the upstream side flow path being a flow path between the flow inlet and the pump flow inlet; and a downstream side flow path located at a position more downstream than the pump and communicating with the pump flow outlet, the downstream side flow path being a flow path between the pump flow outlet and the flow outlet, characterized in that the upstream side flow path has: a first flow path located on one side in a first direction with respect to the pump flow inlet; a second flow path located on the other side in the first direction with respect to the pump flow inlet; a third flow path located on one side in a second direction perpendicular to the first direction with respect to the pump flow inlet; a fourth flow path located on the other side in the second direction with respect to the pump flow inlet; a fifth flow path located on one side in a third direction perpendicular to the first and second directions with respect to the pump flow inlet; and a sixth flow path located on the other side in the third direction with respect to the pump flow inlet, the flow inlet and the pump flow inlet being located on opposite sides of the pump in the third direction, the first housing having opposite first and second outer main surfaces and an outer side surface provided between the first and second outer main surfaces, a recess capable of allowing the pump to be inserted and removed is provided in the first outer main surface, the pump is disposed in the recess of the first outer main surface, and a groove communicating with the recess of the first outer main surface is provided in the outer side surface of the first housing.

2. The liquid feeding device according to claim 1, wherein the pump has: a second housing; an impeller; a pump rotation shaft; and a motor that rotates the impeller about the pump rotation shaft, the impeller being housed in a pump chamber located between the first housing and the second housing.

3. The liquid feeding device according to claim 2, wherein an end portion of one side in the first direction of the first flow path is located at a position more on one side in the first direction than an end portion of one side in the first direction of the pump chamber, an end portion of the other side in the first direction of the second flow path is located at a position more on the other side in the first direction than an end portion of the other side in the first direction of the pump chamber, an end portion of one side in the second direction of the third flow path is located at a position more on one side in the second direction than an end portion of one side in the second direction of the pump chamber, an end portion of the other side in the second direction of the fourth flow path is located at a position more on the other side in the second direction than an end portion of the other side in the second direction of the pump chamber, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ an end portion of the third direction side of the fifth flow path is located at a position closer to the third direction side than an end portion of the third direction side of the pump chamber, an end portion of the other third direction side of the sixth flow path is located at a position closer to the other third direction side than an end portion of the other third direction side of the pump chamber.

4. The liquid delivery device according to claim 3, wherein the upstream side flow path further has a first tank chamber that is connected to the flow inlet, the first tank chamber has at least a portion of the first flow path, at least a portion of the third flow path, at least a portion of the fourth flow path, at least a portion of the fifth flow path, and at least a portion of the sixth flow path.

5. The liquid delivery device according to claim 4, wherein the upstream side flow path further has a second tank chamber that is located on the side opposite to the first tank chamber with respect to the pump chamber, the second tank chamber has at least a portion of the second flow path, at least a portion of the third flow path, at least a portion of the fourth flow path, at least a portion of the fifth flow path, and at least a portion of the sixth flow path.

6. The liquid delivery device according to claim 5, wherein a volume of the first tank chamber is larger than a volume of the second tank chamber.

7. The liquid delivery device according to claim 5, wherein the upstream side flow path has: a first communication flow path that connects the first tank chamber and the second tank chamber on the one second direction side; and a second communication flow path that connects the first tank chamber and the second tank chamber on the other second direction side.

8. The liquid delivery device according to any one of claims 1 to 7, further comprising: a cold plate that contacts a heat generating component, the sixth flow path is located between the pump and the cold plate.

9. The liquid delivery device according to claim 8, further comprising: a partition plate that is located between the pump and the cold plate, the upstream side flow path has, as at least a portion of the sixth flow path, an intermediate flow path at a position between the partition plate and the pump.

10. The liquid delivery device according to claim 2, wherein the outer side surface has: a first outer side surface that is continuous with the first outer main surface and the second outer main surface; a second outer side surface that is continuous with the first outer main surface and the second outer main surface; a third outer side surface that is continuous with the first outer main surface, the second outer main surface, the first outer side surface, and the second outer side surface; and a fourth outer side surface that is continuous with the first outer main surface, the second outer main surface, the first outer side surface, and the second outer side surface.

11. The liquid delivery device according to claim 10, wherein the recessed portion of the first outer main surface has a side surface and a bottom surface, the bottom surface of the recessed portion has a normal line along the third direction, the pump rotation axis extends in parallel with the third direction.

12. The liquid feeding device according to claim 10, wherein the groove is provided on the first outer side surface so as to communicate with the recessed portion of the first outer side main surface.

13. A cooling unit, comprising: the liquid feeding device according to any one of claims 1 to 12; an inflow pipe connected to the inflow port of the liquid feeding device; an outflow pipe connected to the outflow port of the liquid feeding device; and a heat sink connected to at least one of the inflow pipe and the outflow pipe.

14. The cooling unit according to claim 13, wherein the heat sink is connected to the inflow pipe and the outflow pipe.

15. The cooling unit according to claim 13 or 14, wherein the heat sink is connected to the inflow pipe and the outflow pipe.

16. The cooling unit according to any one of claims 13 to 15, wherein the heat sink is connected to the inflow pipe and the outflow pipe.

17. The cooling unit according to any one of claims 13 to 16, wherein the heat sink is connected to the inflow pipe and the outflow pipe.

18. The cooling unit according to any one of claims 13 to 17, wherein the heat sink is connected to the inflow pipe and the outflow pipe.

19. The cooling unit according to any one of claims 13 to 18, wherein the heat sink

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