# US 2019/0376505 A1 · Peristaltic pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376505 A1 - Document ID: US20190376505A1 - Status: Published application - Kind: A1 - Application number: 16/429,249 - Filed: 2019-06-03 - Published: 2019-12-12 - Earliest claimed: 2018-06-07 - Assignees: ProMinent GmbH - Applicants: ProMinent GmbH - Inventors: Phillipp Raupach; Jonas Kohler - Web page: https://patentgrep.com/patent/US20190376505A1 ## CPC - F04B 43/1253: {by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing} - F04B 43/1276: {Means for pushing the rollers against the tubular flexible member} - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) ## Abstract Described is a peristaltic pump comprising a casing which has a casing bottom, a casing cover and a casing wall extending from the casing bottom to the casing cover, which form a pump chamber, a tube which connects a casing inlet to a casing outlet and is arranged within the pump chamber, and a displacement element which has at least two displacement members and is fixed to a rotor which is rotatable about a rotor axis so that in the rotary movement of the rotor each displacement member performs a movement in an operative plane, wherein the tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members roll on the tube so the tube is squashed together so that a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet. The displacement element is of a two-part structure comprising a first part which is fixed to the rotor and a second part which has a displacement member, wherein the second part of the displacement element in a position of the rotor relative to the first part of the displacement element can be reciprocated between an operative position in which the operative planes of the two displacement members are identical and a change position in which the operative planes of the two displacement members are arranged parallel to each other. ## Claims ### Claim 1 A peristaltic pump comprising a casing which has a casing bottom, a casing cover and a casing wall extending from the casing bottom to the casing cover, which form a pump chamber, and a casing inlet and a casing outlet which respectively provide a communication with the pump chamber, a tube which connects the casing inlet to the casing outlet and is arranged within the pump chamber, and a displacement element which has at least two displacement members and is fixed to a rotor which is rotatable about a rotor axis so that in the rotary movement of the rotor each displacement member performs a movement in an operative plane, wherein the tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members slide or roll on the tube so that the tube is squashed together and a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet, characterised in that the displacement element is of a two-part structure comprising a first part which is fixed to the rotor and a second part which has a displacement member, wherein the second part of the displacement element in at least one position of the rotor relative to the first part of the displacement element can be reciprocated between an operative position in which the operative planes of the two displacement members are identical and a change position in which the operative planes of the two displacement members are arranged parallel to each other. ### Claim 2 (depends on 1) A peristaltic pump according to claim 1 characterised in that at least one part of the casing cover is removable and the second part of the displacement element in at least one position of the rotor is releasable from the first part of the displacement element. ### Claim 3 (depends on 1) A peristaltic pump according to claim 1 characterised in that each part of the displacement element has at least a displacement member, wherein preferably there are provided at least two support members, wherein at least one support member is provided at each part of the displacement element, wherein by virtue of rotation of the rotor the support members slide or roll on the tube, wherein the support members are so arranged that they do not displace any conveyed medium in the tube. ### Claim 4 (depends on 1) A peristaltic pump according to claim 1 characterised in that the second part of the displacement element is fixed to the rotor. ### Claim 5 (depends on 1) A peristaltic pump according to claim 1 characterised in that the rotor is of a non-circular cross-section, wherein the first part of the displacement element and the second part of the displacement element have a through opening, the internal contour of which is of a configuration corresponding to the external contour of the rotor, so that when the first and/or the second part of the displacement element is pushed with its through opening over the rotor a positively locking connection is produced between the rotor and the first or second part of the displacement element. ### Claim 6 (depends on 1) A peristaltic pump according to claim 1 characterised in that the first part and the second part of the displacement element are connected together by way of a groove-sliding block connection, wherein the groove extends parallel to the rotor axis, wherein the groove is of an undercut configuration and the sliding block is of a configuration corresponding to the groove. ### Claim 7 (depends on 1) A peristaltic pump according to claim 1 characterised in that the displacement element and the tube are so arranged in the casing that by rotation of the rotor each displacement member can be moved into a position in which the displacement member is not in contact with the tube. ### Claim 8 (depends on 2) A peristaltic pump according to claim 2 characterised in that each part of the displacement element has at least a displacement member, wherein there are provided at least two support members, wherein at least one support member is provided at each part of the displacement element, wherein by virtue of rotation of the rotor the support members slide or roll on the tube, wherein the support members are so arranged that they do not displace any conveyed medium in the tube. ### Claim 9 (depends on 2) A peristaltic pump according to claim 2 characterised in that the second part of the displacement element is fixed to the rotor. ### Claim 10 (depends on 3) A peristaltic pump according to claim 3 characterised in that the second part of the displacement element is fixed to the rotor. ### Claim 11 (depends on 2) A peristaltic pump according to claim 2 characterised in that the rotor is of a non-circular cross-section, wherein the first part of the displacement element and the second part of the displacement element have a through opening, the internal contour of which is of a configuration corresponding to the external contour of the rotor, so that when the first and/or the second part of the displacement element is pushed with its through opening over the rotor a positively locking connection is produced between the rotor and the first or second part of the displacement element. ### Claim 12 (depends on 3) A peristaltic pump according to claim 3 characterised in that the rotor is of a non-circular cross-section, wherein the first part of the displacement element and the second part of the displacement element have a through opening, the internal contour of which is of a configuration corresponding to the external contour of the rotor, so that when the first and/or the second part of the displacement element is pushed with its through opening over the rotor a positively locking connection is produced between the rotor and the first or second part of the displacement element. ### Claim 13 (depends on 4) A peristaltic pump according to claim 4 characterised in that the rotor is of a non-circular cross-section, wherein the first part of the displacement element and the second part of the displacement element have a through opening, the internal contour of which is of a configuration corresponding to the external contour of the rotor, so that when the first and/or the second part of the displacement element is pushed with its through opening over the rotor a positively locking connection is produced between the rotor and the first or second part of the displacement element. ### Claim 14 (depends on 2) A peristaltic pump according to claim 2 characterised in that the first part and the second part of the displacement element are connected together by way of a groove-sliding block connection, wherein the groove extends parallel to the rotor axis, wherein preferably the groove is of an undercut configuration and the sliding block is of a configuration corresponding to the groove. ### Claim 15 (depends on 3) A peristaltic pump according to claim 3 characterised in that the first part and the second part of the displacement element are connected together by way of a groove-sliding block connection, wherein the groove extends parallel to the rotor axis, wherein preferably the groove is of an undercut configuration and the sliding block is of a configuration corresponding to the groove. ### Claim 16 (depends on 4) A peristaltic pump according to claim 4 characterised in that the first part and the second part of the displacement element are connected together by way of a groove-sliding block connection, wherein the groove extends parallel to the rotor axis, wherein preferably the groove is of an undercut configuration and the sliding block is of a configuration corresponding to the groove. ### Claim 17 (depends on 5) A peristaltic pump according to claim 5 characterised in that the first part and the second part of the displacement element are connected together by way of a groove-sliding block connection, wherein the groove extends parallel to the rotor axis, wherein preferably the groove is of an undercut configuration and the sliding block is of a configuration corresponding to the groove. ### Claim 18 (depends on 2) A peristaltic pump according to claim 2 characterised in that the displacement element and the tube are so arranged in the casing that by rotation of the rotor each displacement member can be moved into a position in which the displacement member is not in contact with the tube. ### Claim 19 (depends on 3) A peristaltic pump according to claim 3 characterised in that the displacement element and the tube are so arranged in the casing that by rotation of the rotor each displacement member can be moved into a position in which the displacement member is not in contact with the tube. ### Claim 20 (depends on 4) A peristaltic pump according to claim 4 characterised in that the displacement element and the tube are so arranged in the casing that by rotation of the rotor each displacement member can be moved into a position in which the displacement member is not in contact with the tube.