# US 10,767,646 B2 · Pump housing for an eccentric screw pump and an eccentric screw pump equipped therewith > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,646 B2 - Document ID: US10767646B2 - Status: Granted - Kind: B2 - Application number: 15/735,878 - Filed: 2016-06-09 - Published: 2018-09-06 - Granted: 2020-09-08 - Earliest claimed: 2015-06-12 - Assignees: NETZSCH Pumpen & Systeme GmbH - Applicants: NETZSCH Pumpen & Systeme GmbH - Inventors: Mikael Tekneyan; Philipp Nübl; Magdalena Brüning - Web page: https://patentgrep.com/patent/US10767646B2 ## CPC - F04C 2/1075: {Construction of the stationary member} - F01C 21/106: {with a radial surface, e.g. cam rings} - F04C 2/1071: {the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type} - F04C 2230/70: Disassembly methods - 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 A pump housing for an eccentric screw pump, with a longitudinal axis and a hollow space constituted running axially between a drive-side opening and a pump-side opening, wherein the pump-side opening is enclosed by a main housing body and a lid fastened removably thereto, wherein the main housing body includes a ring segment-shaped axial guiding surface lying opposite the lid. ## Claims ### Claim 1 A pump housing for an eccentric screw pump, with a longitudinal axis and a hollow space constituted running axially between a drive-side opening and a pump-side opening, wherein the pump-side opening is enclosed by a main housing body and a lid fastened removably thereto wherein the main housing body comprises a ring segment-shaped axial guiding surface lying opposite the lid; wherein the lid includes a ring segment-shaped inner circumferential surface lying opposite the ring segment-shaped axial guiding surface, which the ring segment-shaped inner circumferential surface has the same distance radially from the longitudinal axis as the ring segment-shaped axial guiding surface and is bounded axially on the inside by a projection of the lid extending radially inwards. ### Claim 2 (depends on 1) The pump housing according to claim 1, wherein the ring segment-shaped axial guiding surface extends only in a region of the main housing body covered by the lid. ### Claim 3 An eccentric screw pump including: a fixed pump housing with a longitudinal axis and a hollow space constituted running axially between a drive-side opening and a pump-side opening, wherein the pump-side opening is enclosed by a main housing body and a lid fastened removably thereto, wherein the main housing body comprises a ring segment-shaped axial guiding surface lying opposite the lid, a rotor extending out of the pump-side opening of the pump housing, a stator surrounding the rotor and having a stator flange element, and a connecting piece for the stator, which connecting piece is arranged fixedly at the end of the stator facing away from the pump housing, wherein the stator flange element is arranged between the stator and the pump housing such that, in the fastened state of the lid, it fixes a stator end in a complementary stator holder of the connecting piece, wherein, when the lid is removed, the stator can be axially displaced so far out of the connecting piece in the direction of the pump housing that it disengages from the stator holder of the connecting piece. ### Claim 4 (depends on 2) The pump housing according to claim 2, wherein the ring segment-shaped axial guiding surface is bounded axially on the outside by a projection of the main housing body. ### Claim 5 (depends on 2) The pump housing according to claim 2, wherein a contact plane runs between the lid and the main housing body obliquely with respect to the longitudinal axis of the pump housing. ### Claim 6 (depends on 2) The pump housing according to claim 2, wherein a stator flange element coupled with the pump housing is axially displaceable on the ring segment-shaped axial guiding surface and the lid fastened to the main housing body prevents a displacement of the stator flange element in the direction of the drive-side opening. ### Claim 7 (depends on 6) The pump housing according to claim 6, wherein the main housing body limits the axial displaceability of the stator flange element in a direction away from the drive-side opening. ### Claim 8 (depends on 1) The pump housing according to claim 1, wherein the ring segment-shaped axial guiding surface is bounded axially on the outside by a projection of the main housing body. ### Claim 9 The pump housing according to claim I, wherein a contact plane runs between the lid and the main housing body obliquely with respect to the longitudinal axis of the pump housing. ### Claim 10 The pump housing according to claim I, wherein a stator flange element coupled with the pump housing is axially displaceable on the ring segment-shaped axial guiding surface and the lid fastened to the main housing body prevents a displacement of the stator flange element in the direction of the drive-side opening. ### Claim 11 (depends on 10) The pump housing according to claim 10, wherein the main housing body limits the axial displaceability of the stator flange element in a direction away from the drive-side opening. ### Claim 12 (depends on 3) The pump housing according to claim 3, wherein the lid includes a ring segment-shaped inner circumferential surface lying opposite the ring segment-shaped axial guiding surface, which the ring segment-shaped inner circumferential surface has the same distance radially from the longitudinal axis as the ring segment-shaped axial guiding surface and is bounded axially on the inside by a projection of the lid extending radially inwards. ### Claim 13 (depends on 12) The eccentric screw pump according to claim 12 wherein the stator, the rotor and the stator flange element form a subassembly. ### Claim 14 (depends on 12) The pump housing according to claim 12, wherein the ring segment-shaped axial guiding surface is bounded axially on the outside by a projection of the main housing body. ### Claim 15 (depends on 12) The pump housing according to claim 12, wherein a contact plane runs between the lid and the main housing body obliquely with respect to the longitudinal axis of the pump housing. ### Claim 16 The pump housing according to claim wherein a stator flange element coupled with the pump housing is axially displaceable on the ring segment-shaped axial guiding surface and the lid fastened to the main housing body prevents a displacement of the stator flange element in the direction of the drive-side opening. ### Claim 17 (depends on 16) The pump housing according to claim 16, wherein the main housing body limits the axial displaceability of the stator flange element in a direction away from the drive-side opening. ### Claim 18 (depends on 8) The pump housing according to claim 8, wherein the ring segment-shaped axial guiding surface extends only in a region of the main housing body covered by the lid.