Pump device and cooling device

Abstract

To provide a pump device and a cooling device that can restrain an increase in the number of components.SOLUTION: A first pump and a second pump are centrifugal pumps. A casing comprises a first pump chamber 310 in which the first pump is arranged, and a second pump chamber 320 in which the second pump is arranged. A first bottom surface 311 of the first pump chamber is located on one side in a first direction with respect to a first motor of the first pump. A first side surface 313 connects with the first bottom surface, and extends in the first direction. A first outflow port 317 opens to the first side surface. A second bottom surface 321 of the second pump chamber 320 is located on the one side in the first direction with respect to a second motor of the second pump. A second inflow port 325 opens to the second bottom surface. The casing has a first flow passage connecting the first outflow port and the second inflow port. The second bottom surface is located closer to the other side in the first direction than the first bottom surface.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pump device and a cooling device.

Background Art

[0002] Conventionally, a pump device having a first pump, a second pump, and a casing in which the first pump and the second pump are arranged is known (see, for example, Patent Document 1). Patent Document 1 describes a liquid cooling heat dissipation structure having two pumps and an external cover in which the two pumps are arranged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the liquid cooling heat dissipation structure of Patent Document 1, the two pumps are connected in parallel. Also, a movable member is arranged between the two pumps. The movable member suppresses the coolant extruded from one pump from flowing into the other pump when only one of the pumps is driven. That is, the movable member functions as a check valve.

[0005] However, in the liquid cooling heat dissipation structure of Patent Document 1, since a movable member functioning as a check valve is required, there is a problem that the number of parts increases.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a pump device and a cooling device capable of suppressing an increase in the number of parts.

Means for Solving the Problems

[0007] An exemplary pump device of the present invention flows a liquid. The pump device includes a first pump, a second pump, and a casing. The first pump and the second pump are disposed in the casing. The first pump and the second pump are centrifugal pumps. The first pump has a first motor. The second pump has a second motor. The casing has a first pump chamber in which the first pump is disposed and a second pump chamber in which the second pump is disposed. The first pump chamber has a first bottom surface, a first side surface, a first inlet, and a first outlet. The first bottom surface is located on one side in a first direction with respect to the first motor. The first side surface is connected to the first bottom surface and extends in the first direction. The first inlet opens with respect to the first bottom surface. The first outlet opens with respect to the first side surface. The second pump chamber has a second bottom surface, a second side surface, a second inlet, and a second outlet. The second bottom surface is located on one side in the first direction with respect to the second motor. The second side surface is connected to the second bottom surface and extends in the first direction. The second inlet opens with respect to the second bottom surface. The second outlet opens with respect to the second side surface. The casing has a first flow path connecting the first outlet and the second inlet. The second bottom surface is located on the other side in the first direction than the first bottom surface.

[0008] An exemplary cooling device of the present invention is a cooling device having the above pump device, a cold plate, and a heat exchange chamber. The casing further has a second flow path. The partition member has a first partition member and a second partition member. The first flow path is formed by the first partition member and the casing body. The second flow path is formed by the second partition member and the casing body. The heat exchange chamber is formed by the second partition member and the cold plate. The second partition member has a heat exchange chamber connection port connecting the second flow path and the heat exchange chamber. The first flow path and the heat exchange chamber connection port are arranged to overlap when viewed from the first direction.

[0009] Another exemplary cooling device of the present invention is a cooling device having the above pump device, a cold plate, and a heat exchange chamber. The casing further has a second flow path. The partition member and the casing body constitute the first flow path and the second flow path. The partition member has a heat exchange chamber connection port that connects the second flow path and the heat exchange chamber. The first flow path and the heat exchange chamber connection port are separated when viewed from the first direction. The partition member partitions the first flow path and the heat exchange chamber.

Advantages of the Invention

[0010] According to an exemplary aspect of the present invention, it is possible to provide a pump device and a cooling device that can suppress an increase in the number of parts.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[0013] In this specification, for ease of understanding, the first direction X, the second direction Y, and the third direction Z that are orthogonal to each other are described as appropriate. Also, one side of the first direction X is described as one side X1 of the first direction X, and the other side of the first direction X is described as the other side X2 of the first direction X. Also, one side of the second direction Y is described as one side Y1 of the second direction Y, and the other side of the second direction Y is described as the other side Y2 of the second direction Y. Also, one side of the third direction Z is described as one side Z1 of the third direction Z, and the other side of the third direction Z is described as the other side Z2 of the third direction Z. Also, for convenience, the first direction X may be described as the vertical direction. One side X1 of the first direction X indicates the downward direction, and the other side X2 of the first direction X indicates the upward direction. However, the vertical direction, the upward direction, and the downward direction are defined for convenience of explanation and do not necessarily coincide with the vertical direction. Also, it is merely defined as the vertical direction for convenience of explanation and does not limit the orientation during use of the heat dissipation unit according to the present invention.

[0014] (First Embodiment) With reference to FIGS. 1 to 8, a cooling device 1 having a pump device 2 according to an exemplary first embodiment of the present invention will be described. FIG. 1 is a perspective view showing a cooling device 1 having a pump device 2 according to an exemplary first embodiment of the present invention and a flow path 6 connected to the cooling device 1. FIG. 2 is a perspective view showing the structure of the pump device 2 of the exemplary first embodiment excluding the first motor 110, the second motor 210, and the like. FIG. 3 is a cross-sectional perspective view showing the structure of the pump device 2 of the exemplary first embodiment excluding the first motor 110, the second motor 210, and the like. In the present embodiment, an example in which the pump device 2 is mounted on the cooling device 1 will be described.

[0015] As shown in FIG. 1, in the present embodiment, the cooling device 1 includes a pump device 2, a cold plate 3, and a heat exchange chamber 4 (see FIG. 3). The pump device 2 allows a liquid to flow. In the present embodiment, the liquid functions as a coolant. The cold plate 3 is made of a metal with high thermal conductivity such as copper or aluminum, for example. The cold plate 3 contacts a heat generating component (not shown). In the present embodiment, the lower surface of the cold plate 3 contacts the heat generating component. The heat generating component is not particularly limited, and may be, for example, a semiconductor device. The cold plate 3 absorbs heat from the heat generating component, thereby suppressing the heat generating component from becoming high temperature. Further, the cold plate 3 transfers the heat absorbed from the heat generating component to the liquid (coolant) passing through the inside of the heat exchange chamber 4.

[0016] The cooling device 1 is connected to a flow path 6 through which the liquid flows. The flow path 6 includes, for example, a hose or a pipe. A heat exchange device 7 is provided in the flow path 6. The heat exchange device 7 exchanges the heat of the liquid flowing through the flow path 6 with another medium. The heat exchange device 7 includes, for example, a heat dissipation device such as a radiator. Alternatively, the heat exchange device 7 may be a device that exchanges heat with, for example, a flow path through which another coolant flows. When the pump device 2 is driven, the liquid that has become high temperature in the heat exchange chamber 4 flows from the pump device 2 into the flow path 6 and is cooled by the heat exchange device 7. The liquid whose temperature has decreased in the heat exchange device 7 passes through the flow path 6 and flows into the heat exchange chamber 4 again, and absorbs heat in the heat exchange chamber 4.

[0017] The pump device 2 includes a first pump 100, a second pump 200, and a casing 300. The first pump 100 and the second pump 200 are arranged in the casing 300.

[0018] The first pump 100 and the second pump 200 are centrifugal pumps. The first pump 100 has a first motor 110. The second pump 200 has a second motor 210.

[0019] As shown in FIG. 2, the casing 300 has a first pump chamber 310 and a second pump chamber 320. A first motor 110 is disposed in the first pump chamber 310. The first pump chamber 310 has a first bottom surface 311, a first side surface 313, a first inlet 315, and a first outlet 317.

[0020] The first bottom surface 311 is located on one side X1 in the first direction X with respect to the first motor 110 (see FIG. 1). The first side surface 313 is connected to the first bottom surface 311 and extends in the first direction X. In the present embodiment, the first side surface 313 is connected to the periphery of the first bottom surface 311 and extends from the first bottom surface 311 toward the other side X2 in the first direction X. However, the first side surface 313 does not have to be exactly in the same direction as the first direction X, and may extend substantially in the first direction X.

[0021] The first inlet 315 opens to the first bottom surface 311. The first inlet 315 is an opening through which liquid flows into the first pump chamber 310 from the outside. The first outlet 317 opens to the first side surface 313. The first outlet 317 is an opening through which liquid flows out of the first pump chamber 310 to the outside.

[0022] A second motor 210 (see FIG. 1) is disposed in the second pump chamber 320. The second pump chamber 320 has a second bottom surface 321, a second side surface 323, a second inlet 325, and a second outlet 327.

[0023] The second bottom surface 321 is located on one side X1 in the first direction X with respect to the second motor 210. The second side surface 323 is connected to the second bottom surface 321 and extends in the first direction X. In the present embodiment, the second side surface 323 is connected to the periphery of the second bottom surface 321 and extends from the second bottom surface 321 toward the other side X2 in the first direction X. However, the second side surface 323 does not have to be exactly in the same direction as the first direction X, and may extend substantially in the first direction X.

[0024] The second inlet 325 opens to the second bottom surface 321. The second inlet 325 is an opening through which liquid flows into the second pump chamber 320 from the outside. The second outlet 327 opens to the second side surface 323. The second outlet 327 is an opening through which liquid flows out of the second pump chamber 320 to the outside.

[0025] As shown in FIG. 3, the casing 300 has a first flow path 330. The first flow path 330 connects the first outlet 317 and the second inlet 325. That is, the first pump 100 and the second pump 200 are connected in series. The liquid flowing out of the first pump chamber 310 flows into the second pump chamber 320 through the first flow path 330.

[0026] Thus, in the present embodiment, by connecting the first pump 100 and the second pump 200 in series, even when one of the first pump 100 and the second pump 200 stops, the liquid does not flow backward. Therefore, since there is no need to provide a check valve, an increase in the number of parts can be suppressed.

[0027] Further, in the present embodiment, the second bottom surface 321 of the second pump chamber 320 is located on the other side X2 in the first direction X than the first bottom surface 311 of the first pump chamber 310. Therefore, it is possible to suppress the structure of the first flow path 330 connecting the first pump chamber 310 and the second pump chamber 320 from becoming complicated. The bottom surface of the first flow path 330 is a flat surface extending in the second direction Y and the third direction Z.

[0028] Note that, for example, unlike the present embodiment, when the first bottom surface 311 and the second bottom surface 321 are arranged at the same position in the second direction B, it is necessary to bypass the downstream portion of the first flow path 330 to the one side X1 (lower side) in the first direction X than the second bottom surface 321. Therefore, the structure of the first flow path 330 becomes complicated. Further, when the downstream portion of the first flow path 330 is bypassed to the one side X1 in the first direction X than the second bottom surface 321, the volume of the heat exchange chamber 4 becomes small, so the heat exchange efficiency decreases.

[0029] Next, the structure around the pump device 2 will be described in detail. First, with reference to FIGS. 1 and 4, the path through which the liquid flows in the pump device 2 will be briefly described. FIG. 4 is a cross-sectional perspective view showing the structure of the pump device 2 of the exemplary first embodiment excluding the first motor 110, the second motor 210, and the like.

[0030] As shown in FIG. 1, the casing 300 has a third inlet 341 and a third outlet 342. The third inlet 341 is an opening through which liquid flows into the casing 300 from the outside. The third inlet 341 is connected to the downstream end of the flow path 6. The third outlet 342 is an opening through which liquid flows out of the casing 300 to the outside.

[0031] As shown in FIG. 4, the casing 300 has a second flow path 350. The second flow path 350 is connected to the third inlet 341 (see FIG. 1). The second flow path 350 is disposed above the heat exchange chamber 4. The second flow path 350 is connected to the heat exchange chamber 4 via a heat exchange chamber connection port 303a described later.

[0032] The heat exchange chamber 4 is connected to the first pump chamber 310. The first pump chamber 310 is connected to the second pump chamber 320 via the first flow path 330 as described above. The second pump chamber 320 is connected to the third outlet 342.

[0033] In the present embodiment, the liquid flowing into the pump device 2 from the flow path 6 passes through the second flow path 350, the heat exchange chamber 4, the first pump chamber 310, the first flow path 330, and the second pump chamber 320 and returns to the flow path 6. More specifically, the liquid passes through the third inlet 341, the second flow path 350, a heat exchange chamber connection port 303a described later, the heat exchange chamber 4, the first inlet 315, the first pump chamber 310, the first outlet 317, the first flow path 330, the second inlet 325, the second pump chamber 320, the second outlet 327, and the third outlet 342 in this order.

[0034] Next, with reference to FIGS. 3 to 6, the structures of the second flow path 350, the heat exchange chamber 4, the first pump chamber 310, the first flow path 330, the second pump chamber 320, and the third outlet 342 will be described in detail. FIG. 5 is an exploded perspective view showing the structure of the pump device 2 of the exemplary first embodiment excluding the first motor 110, the second motor 210, and the like. FIG. 6 is an exploded perspective view showing the structures of the cold plate 3 and the partition member 303 of the pump device 2 of the exemplary first embodiment.

[0035] As shown in FIG. 4, the second flow path 350 accommodates the liquid that has flowed into the interior of the pump device 2 from the flow path 6. In the present embodiment, the second flow path 350 also functions as a tank. The second flow path 350 is disposed on the side of the first pump chamber 310 and is not disposed below the first pump chamber 310. The second flow path 350 is disposed on the side of the second pump chamber 320. Also, in the present embodiment, at least a part of the second flow path 350 is disposed on one side X1 in the first direction X with respect to the second pump chamber 320. Specifically, at least a part of the second flow path 350 is disposed on one side X1 in the first direction X with respect to the second bottom surface 321 of the second pump chamber 320. Therefore, by using the space between the second pump chamber 320 and the heat exchange chamber 4 as a flow path, a large amount of liquid can be stored.

[0036] Here, in the present embodiment, the casing 300 includes a casing body 301 and a partition member 303. The first pump 100 and the second pump 200 are disposed in the casing body 301. The casing body 301 constitutes, for example, the first pump chamber 310, the second pump chamber 320, the third inlet 341, and the third outlet 342. The partition member 303 partitions the second flow path 350 and the heat exchange chamber 4. The second flow path 350 is constituted by the casing body 301 and the partition member 303. In the present embodiment, the second flow path 350 is constituted by the casing body 301 and a second partition member 3035 of the partition member 303, which will be described later.

[0037] As shown in FIGS. 4 to 6, the partition member 303 is a substantially flat plate-shaped member. The partition member 303 has a heat exchange chamber connection port 303a that connects the second flow path 350 and the heat exchange chamber 4. In the present embodiment, the heat exchange chamber connection port 303a is formed in a slit shape. Further, the heat exchange chamber connection port 303a extends in the second direction Y. The liquid in the second flow path 350 moves to the heat exchange chamber 4 through the heat exchange chamber connection port 303a.

[0038] In the present embodiment, the partition member 303 includes a first partition member 3030 and a second partition member 3035. In the present embodiment, the second partition member 3035 has the heat exchange chamber connection port 303a. As shown in FIGS. 3 and 5, the heat exchange chamber connection port 303a and the first flow path 330 are arranged to overlap when viewed from the first direction X. In the present embodiment, as described above, since the partition member 303 includes the first partition member 3030 and the second partition member 3035, the heat exchange chamber connection port 303a and the first flow path 330 can be made to overlap when viewed from the first direction X. In other words, even when the heat exchange chamber connection port 303a and the first flow path 330 are arranged to overlap, since the heat exchange chamber connection port 303a and the first flow path 330 are partitioned by the first partition member 3030, leakage of liquid between the heat exchange chamber connection port 303a and the first flow path 330 can be suppressed. The structure of the first partition member 3030 will be described later.

[0039] The heat exchange chamber 4 is constituted by the cold plate 3 and the partition member 303. In the present embodiment, the heat exchange chamber 4 is constituted by the cold plate 3 and the second partition member 3035. The cold plate 3 is a plate-shaped member having a predetermined thickness. The cold plate 3 has a plate body 3a, a housing recess 3b, and a fin portion 3c. The surface of one side X1 of the plate body 3a in the first direction X contacts the heat generating component. The housing recess 3b is provided on the surface of the other side X2 of the plate body 3a in the first direction X. The housing recess 3b houses the liquid. The housing recess 3b extends in the second direction Y and the third direction Z of the plate body 3a. The fin portion 3c is provided in the housing recess 3b. The fin portion 3c has a plurality of fins and is integrally formed with the plate body 3a.

[0040] The heat transferred from the heat-generating component to the plate body 3a is transferred to the liquid passing through the inside of the accommodation recess 3b. At this time, in the fin portion 3c, since the contact area with the liquid is large, the heat is efficiently transferred to the liquid.

[0041] Also, in the present embodiment, an elastic sheet 305 is disposed between the fin portion 3c and the second partition member 3035. The elastic sheet 305 is, for example, a rubber sheet. The elastic sheet 305 is in contact with the fin portion 3c. Thereby, it is possible to suppress the liquid from staying in the gap between the fin portion 3c and the second partition member 3035, and the liquid flowing from the heat exchange chamber connection port 303a can be efficiently flowed between the plurality of fins. As a result, the heat exchange efficiency is improved. Note that the elastic sheet 305 may not be provided.

[0042] The first pump chamber 310 is formed by the casing body 301. In the present embodiment, the first pump chamber 310 is formed by the casing body 301 and the partition member 303.

[0043] Here, with reference to FIG. 7, the detailed structure of the first pump 100 will be described. FIG. 7 is a cross-sectional perspective view of the pump device 2 of the exemplary first embodiment cut along a cross-section passing through the center of the first motor 110 and the center of the second motor 210. As shown in FIG. 7, the first pump 100 disposed in the first pump chamber 310 includes, in addition to the first motor 110, a first holding member 120 and a first impeller 140. The first holding member 120 holds the first motor 110.

[0044] Specifically, the first holding member 120 covers the other side X2 in the first direction X of the first pump chamber 310. The first motor 110 includes a first stator 111, a first rotor 112, and a first magnet 113. The first stator 111 is disposed on the other side X2 in the first direction X with respect to the first holding member 120. Thus, the first stator 111 is isolated from the liquid flowing in the first pump chamber 310 by the first holding member 120. Further, the other side X2 in the first direction X of the first holding member 120 is filled with a resin (not shown) to insert the first stator 111. Thereby, the waterproof property with respect to the first stator 111 is improved.

[0045] The first rotor 112 is disposed on one side X1 in the first direction X with respect to the first holding member 120. The first magnet 113 is, for example, a permanent magnet. The first magnet 113 is fixed to the first rotor 112. Further, the first magnet 113 is disposed outside the first stator 111 in the radial direction of the first rotation axis L1. The first rotation axis L1 is the rotation center of the first rotor 112. The first rotation axis L1 extends in the first direction X. The first impeller 140 is fixed to one side X1 in the first direction X of the first rotor 112. When the first rotor 112 rotates about the first rotation axis L1, the first impeller 140 also rotates about the first rotation axis L1. Then, the liquid in the first pump chamber 310 flows out from the first outlet 317.

[0046] Further, the casing 300 has a first support shaft portion 360 that supports the first rotor 112. The first support shaft portion 360 is disposed at the center of the first bottom surface 311 of the first pump chamber 310. The first support shaft portion 360 is disposed on the first rotation axis L1. In the present embodiment, the first support shaft portion 360 includes a first rotation center shaft 361 and a first support portion 362 that supports the first rotation center shaft 361. In the present embodiment, the first rotation center shaft 361 is supported by the first support portion 362 and the first holding member 120. The first rotor 112 rotates about the first rotation center shaft 361. Note that, in the present embodiment, the first rotation center shaft 361 does not rotate, but the first rotation center shaft 361 may rotate together with the first rotor 112.

[0047] Also, in the present embodiment, the first support portion 362 and the casing main body 301 are, for example, integrally molded products. Note that the first support portion 362 and the casing main body 301 do not have to be integrally molded products.

[0048] Further, the casing 300 has a first connection flow path 380. The first connection flow path 380 extends in the first direction X. In the present embodiment, the first connection flow path 380 is disposed inside the first support shaft portion 360 and on one side X1 in the first direction X. The first connection flow path 380 is connected to the heat exchange chamber 4 and is also connected to the first inlet 315 of the first pump chamber 310.

[0049] As shown in FIG. 3, the first flow path 330 is constituted by the casing main body 301 and the first partition member 3030. In other words, the first flow path 330 is constituted by the casing main body 301 and the partition member 303. That is, since the casing main body 301 and the partition member 303 are constituted by separate members, the casing main body 301 and the partition member 303 can be manufactured by resin molding to form the first flow path 330. Note that even if an attempt is made to manufacture the casing main body 301 and the partition member 303 which constitute the first flow path 330 as an integrally molded product by resin molding, since the mold parts for forming the first flow path 330 cannot be removed, it cannot be manufactured by resin molding.

[0050] As shown in FIGS. 5 and 6, the first partition member 3030 is formed of a flat plate-like member. The first partition member 3030 has a first recess 3030a and a second recess 3030b. The first recess 3030a and the second recess 3030b are provided on the other side X2 in the first direction X of the first partition member 3030. The first recess 3030a constitutes a part of the first pump chamber 310. The second recess 3030b constitutes a part of the first flow path 330.

[0051] Here, with reference to FIG. 8, the structure of the first flow path 330 will be further described. FIG. 8 is a plan view showing the structure of the pump device 2 of the exemplary first embodiment excluding the first motor 110, the second motor 210, and the like. As shown in FIG. 8, the first flow path 330 extends tangentially from the first side surface 313 of the first pump chamber 310 and is connected to the second inlet 325. Therefore, the liquid flowing along the first side surface 313 can be smoothly flowed to the second inlet 325. In the present embodiment, the first flow path 330 extends linearly as viewed from the first direction X.

[0052] As shown in FIG. 7, the second pump chamber 320 is formed by the casing main body 301. The second pump 200 disposed in the second pump chamber 320 includes, in addition to the second motor 210, a second holding member 220 and a second impeller 240. The second holding member 220 holds the second motor 210.

[0053] Specifically, the second holding member 220 covers the other side X2 in the first direction X of the second pump chamber 320. The second motor 210 includes a second stator 211, a second rotor 212, and a second magnet 213. Note that the second stator 211 is an example of the "stator" of the present invention. The second rotor 212 is an example of the "rotor" of the present invention.

[0054] The second stator 211 is disposed on the other side X2 in the first direction X with respect to the second holding member 220. Therefore, the second stator 211 is isolated from the liquid flowing in the second pump chamber 320 by the second holding member 220. Further, the other side X2 in the first direction X of the second holding member 220 is filled with a resin (not shown) to insert the second stator 211. Thereby, the waterproof property with respect to the second stator 211 is improved.

[0055] The second rotor 212 is disposed on one side X1 in the first direction X with respect to the second holding member 220. The second magnet 213 is, for example, a permanent magnet. The second magnet 213 is fixed to the second rotor 212. Also, the second magnet 213 is disposed outside the second stator 211 in the radial direction of the second rotation axis L2. The second rotation axis L2 is the rotation center of the second rotor 212. The second rotation axis L2 extends in the second direction B. The second impeller 240 is fixed to one side X1 in the first direction X of the second rotor 212. When the second rotor 212 rotates about the second rotation axis L2, the second impeller 240 also rotates about the second rotation axis L2. Then, the liquid in the second pump chamber 320 flows out from the second outlet 327.

[0056] Also, the casing 300 has a second support shaft portion 370 that supports the second rotor 212. Note that the second support shaft portion 370 is an example of the "support shaft portion" of the present invention. The second support shaft portion 370 is disposed at the center of the second bottom surface 321 of the second pump chamber 320. The second support shaft portion 370 is disposed on the second rotation axis L2. In the present embodiment, the second support shaft portion 370 has a second rotation center shaft 371 and a second support portion 372 that supports the second rotation center shaft 371. In the present embodiment, the second rotation center shaft 371 is supported by the second support portion 372 and the second holding member 220. The second rotor 212 rotates about the second rotation center shaft 371. Note that although the second rotation center shaft 371 does not rotate in the present embodiment, the second rotation center shaft 371 may rotate together with the second rotor 212.

[0057] Also, in the present embodiment, the second support portion 372 and the casing main body 301 are, for example, integrally molded products. Note that the second support portion 372 and the casing main body 301 do not have to be integrally molded products.

[0058] Further, the casing 300 has a second connection flow path 390. Note that the second connection flow path 390 is an example of the "connection flow path" of the present invention. The second connection flow path 390 extends in the first direction X along the second support shaft portion 370. The second connection flow path 390 is connected to the first flow path 330 and also connected to the second inlet 325 of the second pump chamber 320. Therefore, the liquid flowing from the first pump 100 in a direction substantially orthogonal to the second rotation axis L2 can be smoothly flowed in a direction along the second rotation axis L2.

[0059] As shown in FIG. 8, the third outlet 342 extends tangentially from the second side surface 323 of the second pump chamber 320 and is connected to the flow path 6.

[0060] (Second Embodiment) With reference to FIGS. 9 to 15, a cooling device 1 having a pump device 2 according to an exemplary second embodiment of the present invention will be described. FIG. 9 is a perspective view showing a cooling device 1 having a pump device 2 according to an exemplary second embodiment of the present invention and a flow path 6 connected to the cooling device 1. FIG. 10 is a perspective view showing the structure of the pump device 2 of the exemplary second embodiment excluding the first motor 110, the second motor 210, and the like. FIG. 11 is a cross-sectional perspective view showing the structure of the pump device 2 of the exemplary second embodiment excluding the first motor 110, the second motor 210, and the like. FIG. 12 is a cross-sectional perspective view of the pump device 2 of the exemplary second embodiment cut along a cross section passing through the center of the first motor 110 and the center of the second motor 210. In the second embodiment, unlike the first embodiment, an example in which the partition member 303 is constituted by one member will be described. Also, in the present embodiment, unlike the first embodiment, the drawing in which the first pump 100 is arranged on the left side and the second pump 200 is arranged on the right side will be used for the description.

[0061] As shown in FIG. 9, the cooling device 1 has, as in the first embodiment, a pump device 2, a cold plate 3, and a heat exchange chamber 4 (see FIG. 11).

[0062] As shown in FIG. 10, similar to the first embodiment, the casing 300 has a first pump chamber 310 and a second pump chamber 320. The first pump chamber 310 and the second pump chamber 320 are connected by a first flow path 330.

[0063] Here, in the present embodiment, unlike the first embodiment, the first flow path 330 is not formed linearly in a plan view. Specifically, the first flow path 330 is bent in a plan view. The first flow path 330 has a linear portion 330a extending in a tangential direction from the first side surface 313 and a portion 330b extending parallel to the second direction Y.

[0064] Also, in the present embodiment, the third inlet 341 and the third outlet 342 are arranged at the upper part of the casing 300. The third inlet 341 extends in the first direction X. The third outlet 342 extends in the third direction Z.

[0065] As shown in FIG. 11, in the present embodiment, similar to the first embodiment, the liquid passes through the third inlet 341, the second flow path 350, the heat exchange chamber connection port 303a, the heat exchange chamber 4, the first inlet 315, the first pump chamber 310, the first outlet 317, the first flow path 330 (see FIG. 10), the second inlet 325, the second pump chamber 320, the second outlet 327, and the third outlet 342 in this order.

[0066] In the present embodiment, the third inlet 341 extends to the lower part in the second flow path 350. As shown in FIG. 12, at least a part of the second flow path 350 is arranged on one side X1 of the first direction X with respect to the second bottom surface 321 of the second pump chamber 320, similar to the first embodiment.

[0067] Also, in the present embodiment, as shown in FIG. 11, at least a part of the second flow path 350 is arranged on the other side X2 of the first direction X with respect to the second pump chamber 320. Therefore, even when air flows into the second flow path 350 from the third inlet 341, the air can be retained in the second flow path 350. As a result, the flow of air into the first pump 100 and the second pump 200 can be suppressed.

[0068] Next, with reference to FIGS. 13 to 15, the structure around the partition member 303 will be described. FIG. 13 is an exploded perspective view showing the structure of the pump device 2 of the exemplary second embodiment excluding the first motor 110, the second motor 210, and the like. FIG. 14 is an exploded perspective view showing the structure of the cold plate 3 and the partition member 303 of the pump device 2 of the exemplary second embodiment. FIG. 15 is a plan view showing the structure of the pump device 2 of the exemplary second embodiment excluding the first motor 110, the second motor 210, and the like.

[0069] As shown in FIGS. 13 and 14, in the present embodiment, the partition member 303 is formed of one member. That is, the partition member 303 does not have the first partition member 3030 and the second partition member 3035. The partition member 303 has a heat exchange chamber connection port 303a, a flat plate portion 303b, and a convex portion 303c. The heat exchange chamber connection port 303a is disposed on the flat plate portion 303b. The heat exchange chamber connection port 303a extends in the third direction Z. The convex portion 303c constitutes the bottom surface of a portion 330b (see FIG. 10) of the first flow path 330. Note that the width of the convex portion 303c in the third direction Z is larger than the width of the portion 330b of the first flow path 330 in the third direction Z.

[0070] In the present embodiment, the first flow path 330 and the second flow path 350 (see FIG. 12) are formed by the casing main body 301 and the partition member 303. Further, the partition member 303 partitions the first flow path 330 and the heat exchange chamber 4.

[0071] Also, as shown in FIG. 15, in the present embodiment, the first flow path 330 and the heat exchange chamber connection port 303a are separated when viewed from the first direction X. Therefore, as shown in FIG. 12, the first flow path 330 and the second flow path 350 can be formed by the casing main body 301 and one member (partition member 303). Further, the first flow path 330 and the heat exchange chamber 4 can be partitioned by one member (partition member 303).

[0072] Other structures and effects of the present embodiment are the same as those of the first embodiment.

[0073] The embodiments (including modifications) of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist thereof. Also, by appropriately combining a plurality of components disclosed in the above embodiments, various inventions can be formed. For example, some components may be deleted from all the components shown in the embodiments. For example, components from different embodiments may be appropriately combined. The drawings schematically show each component mainly for easy understanding, and the thickness, length, number, interval, etc. of each illustrated component may differ from the actual ones for convenience in drawing preparation. Also, the materials, shapes, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various changes can be made without substantially departing from the effects of the present invention.

[0074] For example, in the above first and second embodiments, an example of using the pump device 2 for the cooling device 1 is shown. However, the present invention is not limited to this, and the pump device 2 may be used for devices other than the cooling device 1.

Industrial Applicability

[0075] The present invention can be used, for example, for pump devices and cooling devices.

Explanation of Reference Numerals

[0076] 1: Cooling device 2: Pump device 3: Cold plate 4: Heat exchange chamber 100: First pump 110: First motor 200: Second pump 210: Second motor 211: Second stator 212: Second rotor 300: Casing 301: Casing body 303: Partition member 303a: Heat exchange chamber connection port 310: First pump chamber 311: First bottom surface 313: First side surface 315: First inlet 317: First outlet 320: Second pump chamber 321: Second bottom surface 323: Second side surface 325: Second inlet 327: Second outlet 330: First flow path 341: Third inlet 342: Third outlet 350: Second flow path 370: Second support shaft part (support shaft part) 390: Second connecting flow path (connecting flow path) 3030: First partition member 3035: Second partition member A: First direction A1: One side A2: The other side B: Second direction B1: One side B2: The other side

Claims

1. A pump device for flowing a liquid, comprising: a first pump; a second pump; a casing in which the first pump and the second pump are disposed; and having the first pump and the second pump are centrifugal pumps; the first pump has a first motor; the second pump has a second motor; the casing has a first pump chamber in which the first pump is disposed and a second pump chamber in which the second pump is disposed; the first pump chamber has a first bottom surface located on one side in a first direction with respect to the first motor, a first side surface connected to the first bottom surface and extending in the first direction, a first inlet opening to the first bottom surface, and a first outlet opening to the first side surface; the second pump chamber has a second bottom surface located on one side in the first direction with respect to the second motor, a second side surface connected to the second bottom surface and extending in the first direction, a second inlet opening to the second bottom surface, and a second outlet opening to the second side surface; the casing has a first flow path connecting the first outlet and the second inlet; the second bottom surface is located on the other side in the first direction than the first bottom surface; the casing has a casing body and a partition member; the first pump and the second pump are disposed in the casing body; the first flow path is formed by the casing body and the partition member; a cold plate; a heat exchange chamber and having a cooling device, the casing further has a second flow path; the partition member has a first partition member and a second partition member; the first flow path is formed by the first partition member and the casing body; the second flow path is formed by the second partition member and the casing body; the heat exchange chamber is formed by the second partition member and the cold plate; the second partition member has a heat exchange chamber connection port connecting the second flow path and the heat exchange chamber; the first flow path and the heat exchange chamber connection port are arranged overlapping when viewed from the first direction. A cooling device.

2. The pump device according to claim 1, wherein the first flow path extends from the first side surface in a tangential direction of the first side surface and is connected to the second inlet.

3. The second motor has a stator and a rotor; the casing has a support shaft portion for supporting the rotor and a connection flow path extending in the first direction along the support shaft portion. The pump device according to claim 1 or claim 2, wherein the connection flow path is connected to the first flow path and is also connected to the second outlet of the second pump chamber.

4. A cooling device having the pump device according to claim 1, a cold plate, and a heat exchange chamber wherein the casing further has a second flow path, the first flow path and the second flow path are formed by the partition member and the casing body, the partition member has a heat exchange chamber connection port connecting the second flow path and the heat exchange chamber, the first flow path and the heat exchange chamber connection port are separated when viewed from the first direction, and the partition member partitions the first flow path and the heat exchange chamber.

5. At least a part of the second flow path is disposed on one side in the first direction with respect to the second bottom surface of the second pump chamber, the cooling device according to claim 1.

6. The casing has a third inlet and a third outlet, at least a part of the second flow path is disposed on the other side in the first direction with respect to the second pump chamber, and the liquid passes through the third inlet, the second flow path, the heat exchange chamber connection port, the heat exchange chamber, the first inlet, the first pump chamber, the first inlet, the first flow path, the second inlet, the second pump chamber, the second outlet, and the third outlet in this order, the cooling device according to claim 1. ​

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