Pump device, cooling unit, and cooling system

Abstract

A pump device includes a flow path through which liquid flows, a first pump in the flow path, a second pump in the flow path, a first pump downstream flow path located downstream of the first pump in the flow path, a second pump downstream flow path located downstream of the second pump in the flow path, a connection flow path connected to the first pump downstream flow path and the second pump downstream flow path in the flow path, a first check valve provided in the first pump downstream flow path, and a second check valve provided in the second pump downstream flow path or the connection flow path.

What is claimed is: 
     
         1 . A pump device, comprising:
 a flow path through which liquid flows;   a first pump in the flow path;   a second pump in the flow path;   a first pump downstream flow path located downstream of the first pump in the flow path;   a second pump downstream flow path located downstream of the second pump in the flow path;   a connection flow path connected to the first pump downstream flow path and the second pump downstream flow path in the flow path;   a first check valve provided in the first pump downstream flow path; and   a second check valve provided in the second pump downstream flow path or the connection flow path.   
     
     
         2 . The pump device according to  claim 1 , further comprising:
 a housing that includes a first pump chamber in which the first pump is provided and a second pump chamber in which the second pump is provided; wherein   the connection flow path, the first check valve, and the second check valve are provided in the housing.   
     
     
         3 . The pump device according to  claim 2 , wherein
 the first check valve and the second check valve include:
 a main body; and 
 a conical protrusion protruding from the main body; and 
   the protrusion protrudes toward an upstream side of the flow path.   
     
     
         4 . The pump device according to  claim 2 , wherein
 the housing includes:
 a first opening partially opened in the first pump downstream flow path; 
 a second opening partially opened in the second pump downstream flow path; 
 a first check valve cover that covers the first opening; and 
 a second check valve cover that covers the second opening; 
   the first check valve is located in a space defined by the first opening and the first check valve cover; and   the second check valve is located in a space defined by the second opening and the first check valve cover.   
     
     
         5 . The pump device according to  claim 4 , wherein
 the first opening includes:
 a first portion connected to the first pump chamber; and 
 a second portion in which the first check valve is located; and 
   a width of the first portion is smaller than a width of the second portion.   
     
     
         6 . A cooling assembly, comprising:
 the pump device according to  claim 4 ; and
 a metal cold plate located in a first direction with respect to the housing of the pump device; wherein 
 the flow path includes a cooling flow path defined by the housing and the cold plate. 
   
     
     
         7 . The cooling assembly according to  claim 6 , wherein
 the cold plate includes a plurality of fins located in the cooling flow path and extending to one side in the first direction;   the housing includes a flow path opening that opens to the other side in the first direction; and   a portion of the plurality of fins overlaps the flow path opening in the first direction.   
     
     
         8 . The cooling assembly according to  claim 7 , further comprising:
 a partition located between the housing and the cold plate in the first direction and in contact with at least one of the plurality of fins; wherein   the partition includes a through hole extending in the same direction as the flow path opening; and   the through hole and the flow path opening are connected at a position overlapping in the first direction.   
     
     
         9 . The cooling assembly according to  claim 7 , wherein
 the flow path opening is at least a portion of the connection flow path.   
     
     
         10 . The cooling assembly according to  claim 7 , wherein
 the first pump and the second pump are centrifugal pumps;   the first pump and the second pump are in a second direction orthogonal to the first direction with the connection flow path interposed therebetween;   the connection flow path extends in a third direction orthogonal to the first direction and the second direction;   the first pump downstream flow path is connected to one side of the connection flow path in the third direction; and   the second pump downstream flow path is connected to the other side of the connection flow path in the third direction.   
     
     
         11 . The cooling assembly according to  claim 7 , wherein
 the housing further includes:
 an inflow port into which liquid flows; and 
 an outflow port through which liquid flows out; and 
   the flow path further includes:
 an inflow path connected to the inflow port; 
 a first pump upstream flow path connecting the inflow path and the first pump; 
 a second pump upstream flow path connecting the inflow path and the second pump; and 
 an outflow-port-side flow path connecting the cooling flow path and the outflow port. 
   
     
     
         12 . The cooling assembly according to  claim 7 , wherein
 the housing further includes:
 an inflow port into which liquid flows; and 
 an outflow port through which liquid flows out; and 
   the flow path further includes:
 an inflow path connecting the inflow port and the cooling flow path; 
 a first pump upstream flow path connecting the cooling flow path and the first pump; 
 a second pump upstream flow path connecting the cooling flow path and the second pump; and 
 an outflow path connecting the connection flow path and the outflow port. 
   
     
     
         13 . The cooling assembly according to  claim 12 , wherein
 the housing further includes:
 a tank that stores the liquid; and 
 a housing body connected to the tank; 
   the tank includes:
 a tank inflow port through which the liquid flows from the tank into the housing body; 
 a tank outflow port through which the liquid flows out from the housing body into the tank; and 
 an in-tank piping portion in the tank and connected to the tank outflow port; and 
   the inflow port is connected to an inside of the tank.   
     
     
         14 . A cooling system, comprising:
 the cooling assembly according to  claim 11 ; and   a radiator; wherein   the radiator is connected to the inflow port and the outflow port.   
     
     
         15 . The cooling system according to  claim 14 , wherein
 the cold plate includes a groove; and   the groove and the housing define a portion of the flow path.   
     
     
         16 . The cooling system according to  claim 15 , wherein
 the groove is separate from the cooling flow path in which the plurality of fins is provided, and includes an inflow-port-side flow path connecting the inflow port, a first pump chamber, and a second pump chamber.   
     
     
         17 . The cooling system according to  claim 15 , wherein
 the groove includes an outflow-port-side flow path connected to the cooling flow path in which the plurality of fins is provided and connected to the outflow port.