# US 11,905,950 B2 · Screw pump with improved sealing and bearing assembly

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- Number: US 11,905,950 B2
- Document ID: US11905950B2
- Status: Granted
- Kind: B2
- Application number: 17/791,990
- Filed: 2020-01-24
- Published: 2023-02-16
- Granted: 2024-02-20
- Earliest claimed: 2020-01-24
- Assignees: Circor Pumps North America, LLC
- Applicants: Circor Pumps North America, LLC.
- Inventors: Victor Hall; Dennis Fowler; Vasanth Krishnasamy; Simon Bradshaw; Axel Jaeschke
- Web page: https://patentgrep.com/patent/US11905950B2

## CPC

- F04C 15/0038: {Shaft sealings specially adapted for rotary-piston machines or pumps}
- F01C 19/005: {Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements (vane construction F01C21/0809; piston rings and ring sealings of similar construction in general F16J9/00)}
- F01C 21/02: Arrangements of bearings (bearing constructions F16C)
- F04C 2/16: with helical teeth, e.g. chevron-shaped, screw type {(for non-parallel axes of movement F04C3/00)}
- F04C 2230/602: Gap; Clearance
- F04C 2240/30: Casings or housings
- F04C 2240/50: Bearings
- F04C 2240/56: Bearing bushings or details thereof
- F04C 2240/805: Fastening means, e.g. bolts
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)

## Abstract

An improved screw pump such as, for example, a twin screw pump, includes a casing including an internal chamber, and first and second rotors rotatably positioned within the chamber of the casing. The first and second rotors have an intermeshing threaded-shape profiling. A plurality of bearing seal assemblies are provided at each end of the first and second rotors. Each bearing seal assembly includes a bearing positioned about an end portion of a rotor to facilitate rotation of the rotor, and a seal positioned about an end portion of a rotor to seal passage of the rotor through the casing. The bearing is coupled to the seal so that the seal may be secured to the casing via the coupling of the bearing to the casing.

## Claims

### Claim 1

A screw pump comprising:
a casing including an internal chamber;
first and second rotors rotatably positioned within the chamber of the casing, the first and second rotors including intermeshing threaded-shape profiling; and
a plurality of bearing seal assemblies, a bearing seal assembly positioned at each end of the first and second rotors, each bearing seal assembly including:
a bearing positioned about an end portion of a respective one of the first rotor or the second rotor to facilitate rotation of the respective one of the first rotor or the second rotor; and
a seal positioned about an end portion of the respective one of the first rotor or the second rotor to seal passage of the respective one of the first rotor or the second rotor through the casing;
wherein the seal includes an axially extending projection and the bearing is arranged and configured to receive the axially extending projection; and
wherein the bearing is coupled to the seal so that the seal is secured to the casing via compressive forces induced by a coupling of the bearing to the casing.

### Claim 2 (depends on 1)

The screw pump of claim 1, wherein the seal is positioned on the end portion of the respective one of the first rotor or the second rotor inboard of the bearing.

### Claim 3 (depends on 1)

The screw pump of claim 1, wherein the seal is not separately and independently fastened to the casing.

### Claim 4 (depends on 1)

The screw pump of claim 1, wherein the seal includes an outer diameter and the bearing includes an outer diameter, the outer diameter of the seal is less than the outer diameter of the bearing.

### Claim 5 (depends on 1)

The screw pump of claim 1, wherein the seal is accessible via an access space created by removal of the bearing.

### Claim 6 (depends on 1)

The screw pump of claim 1, wherein the seal and the bearing are arranged and configured to be removed from the casing in unison.

### Claim 7 (depends on 1)

The screw pump of claim 1, further comprising a shim positioned between the bearing and the casing, the shim being arranged and configured to adjust an axial position of the respective one of the first rotor or the second rotor.

### Claim 8 (depends on 1)

The screw pump of claim 1, further comprising one or more additional shims positioned between the seal and the bearing, the one or more additional shims arranged and configured to control a position of the seal.

### Claim 9 (depends on 1)

The screw pump of claim 1, wherein the bearing includes a bearing pod having a flange arranged and configured to receive a plurality of fasteners for coupling the bearing seal assembly to the casing.

### Claim 10 (depends on 9)

The screw pump of claim 9, wherein the bearing pod includes a cavity sized and configured to receive the bearing therein.

### Claim 11 (depends on 10)

The screw pump of claim 10, wherein the seal includes an axially extending projection, the axially extending projection is received within a bore formed in the bearing pod.

### Claim 12 (depends on 11)

The screw pump of claim 11, wherein the flange is positioned at one end of the bearing pod, the bore for receiving the axially extending projection is positioned at an opposite end of the bearing pod from the flange.