Vibration damping device
Embodiments of the invention provide a vibration damping system including a fixed element, a moveable element arranged to move linearly along an axis relative to the fixed element in response to a non-mechanical force, and an inerter element coupling the moveable element to the fixed element, and configured to convert the linear motion of the moveable element into rotational motion about the axis. The vibration damping system may be applied to many types of valves. In some embodiments, the vibration damping system may be applied to pressure relief valves. In some embodiments, the moveable element rotates to provide inertial damping. In other embodiments, the inerter element rotates to provide inertial damping.
1. A pressure relief valve comprising:
a housing defining an inlet, an outlet, and a valve seat between the inlet and the outlet;
a bonnet coupled to the housing and including a controller;
an inerter system coupled between the housing and the bonnet and including
an inerter hub fixed to the housing to inhibit substantial rotation and linear movement,
the inerter hub defining a cam profile, and
a valve member received by the inerter hub and moveable between an open position where flow is provided from the inlet through the valve seat to the outlet, and a closed position where flow is inhibited through the valve seat, a portion of the valve member engaging the cam profile,
the controller biasing the valve member toward the closed position,
the valve member moving toward the open position when a predetermined pressure is achieved within the inlet, and
linear movement of the valve member from when the valve member first leaves the open position toward the closed position, and from when the valve member first leaves the closed position toward the open position causing rotation of the valve member along the cam profile to provide inertial damping.
2. The pressure relief valve of claim 1 , wherein the cam profile is a slot formed in the inerter hub, and the valve member includes a pin that engages the slot.
3. The pressure relief valve of claim 1 , wherein the cam profile is helical.
4. The pressure relief valve of claim 1 , wherein the valve member moves linearly and rotates about an axis.
5. The pressure relief valve of claim 1 , wherein the controller is an adjustable spring.
6. The pressure relief valve of claim 1 , wherein the valve member includes a disk holder arranged to receive a disk for sealing against the valve seat, and a central shaft that is received by the inerter hub, the central shaft extending through the inerter hub.
7. The pressure relief valve of claim 1 , wherein the valve member is coupled to the inerter hub by a bearing element.