Mechanical seal having a double-tier mating ring

• US 6,942,219 B2
• Filed: 10/20/2003
• Issued: 09/13/2005
• Est. Priority Date: 10/20/2003
• Status: Active Grant

• Current Assignee: Board of Supervisors of Louisiana State University Agricultural & Mechanical College (Louisiana State University System)
• Original Assignee: Board of Supervisors of Louisiana State University Agricultural & Mechanical College (Louisiana State University System)
• Inventors: Somanchi, Anoop K., Khonsari, Michael M.
• Primary Examiner(s): Pickard, Alison
• Assistant Examiner(s): PATEL, VISHAL A
• Application Number:
  US10/689,406
• Publication Number:
  US 20050082765A1
• Time in Patent Office: 694 Days
• Field of Search: 277/358, 277359-360, 277/401, 277/408, 165/86, 165/185, 165/907
• US Class Current: 277/360
• CPC Class Codes: F16J 15/3404 and characterised by parts or details relating to lubrication, cooling or venting of the seal

Abstract

An apparatus and method to enhance the overall performance of mechanical seals in one of the following ways: by reducing seal face wear, by reducing the contact surface temperature, or by increasing the life span of mechanical seals. The apparatus is a mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) comprising a rotating ring and a double-tier mating ring. In a preferred embodiment, the double-tier mating ring comprises a first and a second stationary ring that together form an agitation-inducing, guided flow channel to allow for the removal of heat generated at the seal face of the mating ring by channeling a coolant entering the mating ring to a position adjacent to and in close proximity with the interior surface area of the seal face of the mating ring.

Claims

1. A mechanical seal comprising a rotating ring and a mating ring adapted to seal to one another, wherein:

(a) said mating ring comprises a first stationary ring comprising a circumferential groove-channel, a seal face, and an outer and inner surface each having a plurality of symmetrically-spaced radial holes adapted respectively to form inlet and outlet ports, and a second stationary ring comprising a circumferential diverter;

(b) said circumferential groove-channel is adapted to receive said circumferential diverter so that, when combined, said first and said second stationary rings form said mating ring having a circumferential, divergent flow-channel communicating with said inlet and said outlet ports; and

(c) if a coolant is supplied to said divergent flow-channel through said inlet ports, said divergent flow-channel causes the coolant to flow to substantially all portions of the interior surface area of said seal face before exiting through said outlet ports;

whereby heat transfer at the interface of said rotating ring and said mating ring is substantially greater than what would be the heat transfer between otherwise identical sealing members lacking said divergent flow-channel.

2. A mechanical seal as recited in claim 1, wherein said first and said second stationary rings are adapted to be shrink-fitted together.

3. A mechanical seal as recited in claim 1, wherein said first stationary ring and said second stationary rings are adapted to be threaded together.

4. A mechanical seal as recited in claim 1, additionally comprising a coolant selected from the group consisting of air, nitrogen, water, ethylene glycol, propane, and lubricating oil.

5. A mechanical seal as recited in claim 1, wherein said mating ring is adapted to use air as a coolant.

6. A mechanical seal as recited in claim 1, wherein said mating ring is coated with a Ti-containing amorphous hydrocarbon.

7. A mechanical seal as recited in claim 1, wherein said first stationary ring has at least sixteen inlet and sixteen outlet ports.

8. A mechanical seal as recited in claim 1, wherein said circumferential, divergent flow-channel is adapted to induce an agitated coolant flow pattern.

9. A mechanical seal as recited in claim 1, wherein said circumferential, divergent flow-channel is adapted to induce a turbulent coolant flow pattern.