Vibration damper for vacuum pumps
In a vibration damper of a turbomolecular vacuum pump, a vacuum tightness function and a vibration damping function are both performed by one or more toroidal rings made of an elastic material. The elastic rings assume a resting configuration while the vacuum pump is not operating and the damper is at atmospheric pressure, and they assume a compressed configuration while the vacuum pump is operating and the damper is under vacuum conditions. In the compressed configuration, the elastic rings are deformed due to a compression force. This deformation of the elastic rings prevents metal-to-metal contact between the vacuum pump and a vacuum chamber to which the pump is connected through the damper.
1. A vibration damper comprising:
a first cylindrical hollow component arranged about an axis of symmetry and comprising a first end configured to be coupled to a vacuum pump, a second end located opposite the first end, a toroidal semi-seat located at the second end, and a connecting component located at the second end;
a second cylindrical hollow component, arranged about the axis of symmetry and having a first end configured to be coupled to a vacuum chamber, a second end located opposite the first end, a toroidal semi-seat located at the second end, and a connecting component located at the second end;
at least one intermediate component arranged about the axis of symmetry between the first cylindrical hollow component and the second cylindrical hollow component and having a first end configured to be coupled to the first cylindrical hollow component, a second end configured to be coupled to the second cylindrical hollow component, a first toroidal semi-seat located at the first end, a first connecting component located at the first end, a second toroidal semi-seat located at the first end, and a second connecting component located at the second end;
a first toroidal ring comprising an elastic material and disposed between the toroidal semi-seat of the first cylindrical hollow component and the first toroidal semi-seat of the at least one intermediate component, wherein the first toroidal ring assumes a resting configuration in response to a compression force directed along the axis of symmetry with a magnitude lower than a predetermined threshold, and assumes a compressed configuration in response to a compression force directed along the axis of symmetry with a magnitude greater than the predetermined threshold, the resting configuration forming an axial connection between the first cylindrical hollow component and the at least one intermediate component such that the connecting component of the first cylindrical hollow component is in direct contact with the first connecting component of the at least one intermediate component, and the compressed configuration forming a vacuum-tight axial connection between the first cylindrical hollow component and the at least one intermediate component such that the connecting component of the first cylindrical hollow component is not in direct contact with the first connecting component of the at least one intermediate component;
a second toroidal ring comprising an elastic material and disposed between the toroidal semi-seat of the second cylindrical hollow component and the second toroidal semi-seat of the at least one intermediate component, wherein the second toroidal ring assumes a resting configuration in response to the compression force directed along the axis of symmetry with a magnitude lower than a predetermined threshold, and assumes a compressed configuration in response to the compression force directed along the axis of symmetry with a magnitude greater than the predetermined threshold, the resting configuration forming an axial connection between the second cylindrical hollow component and the at least one intermediate component such that the connecting component of the second cylindrical hollow component is in direct contact with the second connecting component of the at least one intermediate component, and the compressed configuration forming a vacuum-tight axial connection between the second cylindrical hollow component and the at least one intermediate component such that the connecting component of the second cylindrical hollow component is not in direct contact with the second connecting component of the at least one intermediate component.
2. The vibration damper of claim 1 , wherein the first toroidal ring is arranged between the first cylindrical hollow component and the at least one intermediate component such that the toroidal semi-seat of the first cylindrical hollow component and the first toroidal semi-seat of the at least one intermediate component define a first toroidal seat in which the first toroidal ring is confined; and
wherein the second toroidal ring is arranged between the second cylindrical hollow component and the at least one intermediate component such that the toroidal semi-seat of the second cylindrical hollow component and the second toroidal semi-seat of the at least one intermediate component define a second toroidal seat in which the second toroidal ring is confined.
3. The vibration damper of claim 2 , wherein the connecting component of the first cylindrical hollow component comprises radial teeth substantially equally spaced along a surface of the first cylindrical hollow component, and the first connecting component of the at least one intermediate component comprises radial teeth substantially equally spaced along a surface of the intermediate component and suitable for engaging the radial teeth of the connecting component of the first cylindrical hollow component.
4. The vibration damper of claim 3 , further comprising a component for preventing accidental rotation of the first cylindrical hollow component with respect to the at least one intermediate component.
5. The vibration damper of claim 1 , wherein the connecting component of the first cylindrical hollow component comprises radial teeth substantially equally spaced along a surface of the first cylindrical hollow component;
wherein the connecting component of the second cylindrical hollow component comprises radial teeth substantially equally spaced along a surface of the second cylindrical hollow component; and
wherein the first connecting component of the at least one intermediate component comprises radial teeth substantially equally spaced along a surface of the at least one intermediate component and suitable for engaging radial teeth of the first cylindrical hollow component, and the second connecting component of the at least one intermediate component comprises radial teeth substantially equally spaced along a surface of the at least one intermediate component and suitable for engaging radial teeth of the second cylindrical hollow component.
6. The vibration damper of claim 1 , further comprising a plurality of components for preventing accidental relative rotation between the first cylindrical hollow component, the second cylindrical hollow component, and the at least one intermediate component.
7. The vibration damper of claim 1 , wherein the first cylindrical hollow component comprises a flange for connection to the vacuum pump.
8. The vibration damper of claim 1 , wherein the first cylindrical hollow component is integral with the vacuum pump.
9. The vibration damper of claim 1 , wherein the second cylindrical hollow component comprises a flange for connection to the vacuum chamber.
10. The vibration damper of claim 1 , wherein the second component is integral with the vacuum chamber.
11. The vibration damper of claim 1 , wherein the toroidal semi-seats of the first and second cylindrical hollow components each have a substantially semi-circular profile.
12. The vibration damper of claim 1 , wherein the toroidal semi-seats of the first and second cylindrical hollow components each have a substantially “L”-shaped profile.
13. The vibration damper of claim 1 , wherein the compression force directed along the axis of symmetry has a magnitude greater than the predetermined threshold while the damper is under vacuum conditions.