Low Pressure Drop Compact Passive Shut-off Valve for Pump Redundancy in Single Coolant Path Liquid Cooling Structures
Original Publication Date: 2005-Jul-18
Included in the Prior Art Database: 2005-Jul-18
The device consists of a passive shut-off valve mechanism intended to allow the use of multiple redundant pumps in parallel to supply coolant to a single coolant path (e.g. a cold plate or direct liquid cooling module). If one pump becomes inoperative, the device will shut off flow in the affected part of the system, isolating the electronics package and working pump(s) from the failed component.
Low Pressure Drop Compact Passive Shut -off Valve for Pump Redundancy in Single Coolant Path Liquid Cooling Structures
Figure 1 illustrates the application of the invention in a liquid cooling system. A primary cooling fluid is directed into the electronics package, which may be cooled by a cold plate, direct immersion, direct impingement, or any other structure utilizing a single coolant path. The coolant is pumped in two parallel circuits, each consisting of a pump, heat exchanger circuit, and the invention. The purpose of the multiple paths is to provide redundancy in the pumps, the most likely failure point of a liquid cooled electronics module. In Figure 1, heat rejection from the primary cooling circuit(s) occurs at the isolated loop heat exchanger, which consists of one circuit for the secondary coolant and one circuit for each parallel primary coolant circuit (e.g. one extra heat exchanger circuit for each pump in parallel). Clearly, the isolated loop heat exchanger could be replaced with a water-to-air heat exchanger or refrigeration system evaporator.
Figure 1. Electronics cooling system incorporating the passive redundant pump failure isolation valve
Figure 2 shows one embodiment of the invention, in which a rotatable member with two protrusions rests in a cavity between two valve housings. Fluid momentum in a properly functioning circuit will force the rotatable member into the open configuration while the rotatable member applies a torque on the torsional spring
located in the upper valve body (see Figure 2). Upon pump failure, the rotatable member is forced to the closed position by the torsion spring, aided by the fluid pressure in the opposite direction to the flow direction b...