DECOUPLED SHAFT SEAL FOR A PROGRESSIVE CAVITY PUMP STUFFING BOX
First Claim
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1. A stuffing box comprising:
- a housing with an internal passage for receiving a shaft; and
a mechanical seal disposed in an annular space between the shaft and the housing to block the passage of fluids, the mechanical seal comprising;
a rotating seal body with a first sealing surface, the rotating seal body for sealingly engaging and rotating with the shaft,a static seal body having a second sealing surface aligned with the first sealing surface, anda flexible member coupled to the housing at a first end of the flexible member and the static seal body at a second end of the flexible member so as to flex with shaft movement transverse to a longitudinal axis of the shaft and so as to not rotate with the shaft.
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Abstract
Stuffing box employing a mechanical seal where the static seal body is laterally decoupled from the stuffing box housing. The static seal body is connected to the housing through a ringed-shaped flexible member. The flexible member flexes with shaft movement transverse to the longitudinal axis of the shaft, so as to absorb the lateral movement of the shaft. Thus, the mechanical seal is maintained while reducing the stresses on the shaft and the internal seals resulting from runout.
26 Citations
10 Claims
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1. A stuffing box comprising:
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a housing with an internal passage for receiving a shaft; and a mechanical seal disposed in an annular space between the shaft and the housing to block the passage of fluids, the mechanical seal comprising; a rotating seal body with a first sealing surface, the rotating seal body for sealingly engaging and rotating with the shaft, a static seal body having a second sealing surface aligned with the first sealing surface, and a flexible member coupled to the housing at a first end of the flexible member and the static seal body at a second end of the flexible member so as to flex with shaft movement transverse to a longitudinal axis of the shaft and so as to not rotate with the shaft. - View Dependent Claims (2, 3, 4, 5)
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6. A stuffing box comprising:
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a housing; an internal sleeve positioned within the housing; and static seals positioned within the internal sleeve, the static seals being adapted to engage a shaft; and a mechanical seal disposed in the annular space between the internal sleeve and the housing to block the passage of fluids, the mechanical seal comprising; a rotating seal body with a first sealing surface, the rotating seal body for sealingly engaging and rotating with the sleeve, a static seal body having a second sealing surface aligned with the first sealing surface, and a flexible member coupled to the housing at a first end of the flexible member and the static seal body at a second end of the flexible member so as to flex with shaft movement transverse to a longitudinal axis of the shaft and so as to not rotate with the shaft. - View Dependent Claims (7, 8, 9, 10)
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Specification