Wash press having improved rotor structure and housing for removing the same

Patent metadata

Field	Value
Publication number	US-11524253-B2
Application number	US-201816640409-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Sep 28, 2017
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

Provided is a wash press that separates liquids and solids from a waste stream. The wash press includes a tank having a semi-cylindrical shape. The tank has an inlet at a top of the tank for receiving a waste stream, a screen disposed in a portion of a bottom of the tank to permit liquid to pass therethrough, and an outlet for permitting solid materials separated from the liquid to pass therethrough. A rotor extends through the tank for transporting and dewatering the waste material entering the tank. The rotor includes a plurality of helical flights interconnected by paddle members to permit agitating the waste material. The wash press also includes a removable cover that enables the rotor to be lifted vertically, and a removably attached screen to facilitate replacement/repair of the same.

First claim

What is claimed is:

1. A wash press configured to separate liquids and solids from a waste stream comprising:
a tank having a semi-cylindrical shape, the tank having an inlet at a top of the tank, a screen disposed in a portion of a bottom of the tank to permit liquid to pass therethrough, and an outlet for permitting solid materials to pass therethrough;
a rotor having a plurality of helical flights interconnected by paddle members, the paddle members having surfaces extending at an angle more closely aligned to a rotation axis of the rotor than surfaces of the helical flights; and
a drive configured to rotate the rotor;
wherein the rotor is configured to transport solid and liquid materials along the tank from the inlet to the outlet in a forward transport direction, and to compress and disturb the solids in the tank to separate the liquid from the solid materials, and
wherein the helical flights on opposite sides of the paddle members are configured to transport the solid and the liquid materials in a same direction.

2. The wash press according to claim 1 , wherein adjacent ones of the helical flights are connected by a paddle member, the paddle member extending between the adjacent helical flights radially outward of a shaft of the rotor.

3. The wash press according to claim 2 , wherein the paddle member extends between the adjacent helical flights in an axial direction of the shaft.

4. The wash press according to claim 2 , wherein the paddle member extends at an angle to an axial direction of the shaft.

5. The wash press according to claim 3 , wherein the paddle member extends at an angle such that when the rotor rotates to transport in the forward transport direction, a face of the paddle member facing the rotation direction faces the forward transport direction.

6. The wash press according to claim 4 , wherein the angle is within the range of 0-45 degrees.

7. The wash press according to claim 5 , wherein the paddle member has a wedge or triangular shaped profile as viewed from a radial direction such that a forward facing face and a rearward facing face are both angled to face the transport direction.

8. The wash press according to claim 2 , wherein a helical flight rearward of the paddle member in the forward transport direction has an end extending circumferentially past the paddle member to form a pocket bounded by the a helical flight forward of the paddle member, the paddle member and the extending portion of the paddle member rearward of the paddle member.

9. The wash press according to claim 1 , wherein the each of the plurality of helical flights interconnected by the paddle members are configured to meet the following expression:
( a )<50% of ( b );
where (a) is the length of a paddle member along the axial direction, and (b) is the length of the pitch of the helical flights in the axial direction.

Assignees

• Sulzer Management Ag

Inventors

• Moir Kevin
• Nydam Todd
• Sabol Rob

Classifications

• C02F11/126

  using drum filters · CPC title

• B01D29/6476 Primary

  with a rotary movement with respect to the filtering element · CPC title

• B01D29/356

  open-ended, the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element · CPC title

• B30B9/121

  Screw constructions · CPC title