CN-224214359-U - Internal gear pump shell with fully-machined internal runner

CN224214359UCN 224214359 UCN224214359 UCN 224214359UCN-224214359-U

Abstract

The application discloses an internal gear pump shell with fully processed internal runner, wherein an inlet runner and an outlet runner of a traditional internal gear pump shell of chemical industry adopt a cast horn-shaped design, the internal gear pump shell has the advantages of gradually and uniformly changed area and small runner resistance, but the curved surface of the runner is complex, the processing and the feeding are difficult, the internal gear pump shell is difficult to process, in certain food and electronic industries, all the over-current parts are required to be processed, the surface finish is required to reach 3.2, and for the traditional internal gear pump with large flow, the processing of the pump shell runner is very troublesome.

Inventors

ZHU HAICHUAN
WANG CHAOYU
Deng Huaixing

Assignees

浦川流体设备(无锡)有限公司

Dates

Publication Date: 20260508
Application Date: 20250520

Claims (4)

1. The inner gear pump shell is characterized in that a front positioning cavity (2) and a rear positioning cavity (2) are arranged in the center of the inner side of the pump shell (1), two sides of the front positioning cavity and the rear positioning cavity (2) are communicated with each other to form a middle runner (5) and an inlet and outlet runner (4), two sides of the middle runner (5) are respectively communicated with the front positioning cavity and the rear positioning cavity (2) and the inlet and outlet runner (4), and the inner sides of the inlet and outlet runner (4), the middle runner (5) and the front positioning cavity and the rear positioning cavity (2) are cylindrical surfaces capable of being processed in a rotary mode.
2. The internal gear pump shell with fully processed internal runner according to claim 1, wherein the middle runner (5) is communicated with the middle parts of the two sides of the front positioning cavity (2) and the rear positioning cavity in a crossing way.
3. The internal gear pump shell with the fully processed internal runner according to claim 1, wherein the processing radius of the middle runner (5) is RC, and the processing radius of the front and rear positioning cavities (2) is RB, wherein RC is less than or equal to RB.
4. The internal gear pump shell with the fully processed internal runner according to claim 3, wherein the distance from the center of the middle runner (5) to the positioning center of the pump shell (1) is L5, and L5 is more than or equal to RB/6.

Description

Internal gear pump shell with fully-machined internal runner Technical Field The utility model relates to the technical field of internal gear pumps, in particular to an internal gear pump shell with an internal runner fully processed. Background The internal gear pump has the advantages of small volume, light weight, simple structure, convenient manufacture, low price, reliable work, better self-priming performance, insensitivity to oil pollution, convenient maintenance and the like. In most chemical medium occasions, the traditional internal gear pump shell runner adopts a cast complex non-processing curved surface design, so that the market requirement can be met. As shown in fig. 1-3, the conventional chemical internal gear pump housing structure: The center of the pump shell 1 is provided with a front positioning cavity 2 and a rear positioning cavity 2, the front positioning cavity 2 and the rear positioning cavity 2 in the pump shell are communicated through a left inner runner 3 and a right inner runner 3 in the pump shell, the inner runner 3 is a complex horn-shaped 3D curved surface with a rectangular cross section which gradually changes from a round small opening to a large cross section intersecting with the front positioning cavity 2 and the rear positioning cavity 2, and the curved surface is difficult to feed from the round small opening or the front positioning cavity 2 and the rear positioning cavity 2 of the pump shell, so that the processing difficulty is very high. For certain food and electronics industries where there is a high demand for a channel surface finish, the cast channel pump casing of this design will not be adequate and customers will have to choose other pumps, such as external gear pumps, rotor pumps, and fluorine lined pumps. Disclosure of utility model Aiming at the problems in the related art, the application discloses an inner gear pump shell with fully processed inner flow passages, solves the problem that the inner flow passages of the traditional inner gear pump shell cannot feed the processed flow passages, can meet the requirement of certain industries on the high surface finish of the flow passages, and widens the application range of the inner gear pump with large flow capacity and chemical industry. In order to achieve the above purpose, the present application provides the following technical solutions: by adopting the technical proposal, the utility model has the advantages that, The pump shell of the internal gear pump with the fully processed internal runner comprises a pump shell and is characterized in that a front positioning cavity and a rear positioning cavity are arranged in the center of the pump shell, two sides of the front positioning cavity and the rear positioning cavity are communicated with each other and are provided with a middle runner and an inlet runner and an outlet runner, two sides of the middle runner are respectively communicated with the front positioning cavity, the rear positioning cavity and the inlet runner, and the outlet runner, the middle runner and the front positioning cavity and the rear positioning cavity are cylindrical surfaces capable of being processed in a rotary mode. As a further scheme of the application, the middle runner is communicated with the middle parts of the two sides of the front positioning cavity and the rear positioning cavity in a crossing way. As a further scheme of the application, the machining radius of the middle runner is RC, and the machining radius of the front positioning cavity and the rear positioning cavity is RB, wherein RC is less than or equal to RB. As a further scheme of the application, the distance from the center of the middle flow channel to the positioning center of the pump shell is L5, and L5 is more than or equal to RB/6. In summary, the beneficial effects of the application are as follows: The inner side surfaces of the inlet and outlet flow passage, the middle flow passage and the front and rear positioning cavities in the inner gear pump shell are cylindrical surfaces which can be processed in a rotary way, the inner flow passage is processed in the large-flow chemical inner gear pump shell, the surface of the flow passage can meet the requirements of finish degree which can be achieved by industrial machining, and the application range of the inner gear pump shell is widened. Drawings The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings: fig. 1 is a main sectional view of a pump housing of a conventional chemical internal gear pump. Fig. 2 is a top cross-sectional view of a conventional chemical gerotor pump housing. Fig. 3 is a 3D view of a conventional chemical gerotor pump housing. Fig. 4 is a main sectional view of the pump housin