Pump shell of internal gear pump with fully-processed internal flow channel

Abstract

An inlet and outlet flow channel of a traditional chemical internal gear pump shell adopts a cast horn-shaped design, has the advantages that the area is gradually and uniformly changed, and the flow channel resistance is small, but the flow channel curved surface is complex, the machining feed is difficult, the machining is difficult, but the inner gear pump shell has the defects in some food and electronic industries. In order to solve the problems that flow passage components are required to be machined completely and the surface smoothness is required to reach 3.2, for a traditional large-flow internal gear pump, machining of a pump shell flow passage is very difficult, and according to the chemical internal gear pump, inlet and outlet flow passages and a pump cavity of a pump shell of the chemical internal gear pump all adopt simple cylindrical curved surface design capable of being machined and fed; therefore, the requirement for full machining of the pump shell runner is met.

Description

Technical Field

[0001] This utility model relates to the field of internal gear pump technology, and in particular to a pump housing for an internal gear pump with fully machined internal flow channels. Background Technology

[0002] Internal gear pumps have advantages such as small size, light weight, simple structure, easy manufacturing, low price, reliable operation, good self-priming performance, insensitivity to oil contamination, and convenient maintenance.

[0003] In most chemical media applications, the complex, non-machined curved surface design of the pump casing of a traditional internal gear pump can meet market requirements.

[0004] like Figure 1-3 As shown, the pump casing structure of a traditional chemical internal gear pump is as follows:

[0005] The pump casing 1 has a front and rear positioning cavity 2 at its center. The front and rear positioning cavities 2 inside the pump casing 1 are connected by left and right internal flow channels 3. The internal flow channel 3 is a complex trumpet-shaped 3D curved surface that gradually changes from a small circular opening to a large rectangular cross-section that intersects with the front and rear positioning cavities 2. It is difficult to cut into this curved surface whether from the small circular opening or from the front and rear positioning cavities 2 of the pump casing, and its machining difficulty is very high.

[0006] For certain food and electronics industries that require high surface finish of the flow channel, this design of cast flow channel pump housing will not be suitable, and customers will have to choose other pumps, such as external gear pumps, rotary pumps, and fluoropolymer-lined pumps. Utility Model Content

[0007] To address the problems in related technologies, this application discloses a fully machined internal gear pump housing, which solves the problem that the internal flow channel of a traditional internal gear pump housing cannot be machined by cutting tools. It can also meet the high surface finish requirements of certain industries for the flow channel, and broaden the application range of large-flow chemical internal gear pumps.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] By adopting the above technical solution

[0010] A fully machined internal gear pump housing includes a pump housing, characterized in that: a front and rear positioning cavity is provided at the center of the pump housing, a middle flow channel and an inlet and outlet flow channel are connected to both sides of the front and rear positioning cavity, the middle flow channel is connected to both sides of the front and rear positioning cavity and the inlet and outlet flow channel respectively, and the inlet and outlet flow channel, the middle flow channel and the front and rear positioning cavity are rotatably machined cylindrical surfaces.

[0011] As a further aspect of this application: the intermediate flow channel intersects and communicates with the middle parts of both sides of the front and rear positioning cavities.

[0012] As a further aspect of this application: the machining radius of the intermediate flow channel is RC, and the machining radius of the front and rear positioning cavities is RB, where RC≤RB.

[0013] As a further aspect of this application: the distance from the center of the intermediate flow channel to the positioning center of the pump casing is L5, where L5 ≥ RB / 6.

[0014] In summary, the beneficial effects of this application are as follows:

[0015] The inlet and outlet flow channels, intermediate flow channels, and inner surfaces of the front and rear positioning cavities inside the pump casing of the internal gear pump are rotatable cylindrical surfaces. The pump casing of the high-flow chemical internal gear pump enables the internal flow channels to be machined, and the surface finish of the flow channels can meet the surface finish requirements of industry machining, thus expanding its application range. Attached Figure Description

[0016] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0017] In the attached diagram:

[0018] Figure 1 This is a main cross-sectional view of the casing of a traditional chemical internal gear pump.

[0019] Figure 2 This is a top-view cross-sectional view of the casing of a traditional chemical internal gear pump.

[0020] Figure 3 A 3D view of the casing of a traditional chemical internal gear pump.

[0021] Figure 4 This is a main cross-sectional view of the pump casing of the chemical internal gear pump in this application.

[0022] Figure 5 This is a top sectional view of the pump casing of the chemical internal gear pump of this application.

[0023] Figure 6 This is a 3D view of the pump casing of the chemical internal gear pump of this application.

[0024] Figure label annotations:

[0025] 1. Pump casing; 2. Front and rear positioning chambers; 3. Inner flow channel; 4. Inlet and outlet flow channels; 5. Intermediate flow channel.

[0026] O, pump casing positioning center; O5, intermediate flow channel center; A, inlet and outlet flow channel diameter; L5, distance from the intermediate flow channel center to the pump casing positioning center; ΦA, inlet and outlet flow channel diameter; RB, machining radius of the front and rear positioning cavities of the pump casing; RC, machining radius of the intermediate flow channel of the pump casing. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects disclosed in this embodiment as detailed in the appended claims.

[0028] It should be noted that all directional indicators in the embodiments (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in the embodiments is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. It is merely to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0030] To further understand the content, features, and effects of this application, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0031] like Figure 4-6 As shown, the pump housing structure of the chemical internal gear pump of this application is as follows:

[0032] The pump casing 1 has a front and rear positioning cavity 2 in the center. The front and rear positioning cavities 2 are connected to the middle flow channel 5 and the inlet and outlet flow channel 4 on both sides. The middle flow channel 5 is connected to the front and rear positioning cavities 2 and the inlet and outlet flow channel 4 on both sides respectively. The middle flow channel 5 intersects and connects with the middle part of the front and rear positioning cavities 2 on both sides.

[0033] The inner surfaces of the inlet and outlet flow channels 4, the intermediate flow channel 5, and the front and rear positioning cavities 2 are cylindrical surfaces that can be rotated and machined.

[0034] The machining radius of the middle flow channel is RC, the machining radius of the front and rear positioning cavities is RB, and the distance from the center O5 of the middle flow channel to the positioning center O of the pump casing is L5.

[0035] The pump casing 1 is connected to the front and rear positioning cavities 2 of the pump casing through the left and right inlet and outlet flow channels 4 and the middle flow channel 5. That is, the inlet and outlet flow channels 4 are made of a cylindrical surface with an inlet diameter of ΦA and the middle flow channel 5 is made of a semi-cylindrical surface with a machining radius of RC to replace the inner flow channel 3 of the traditional chemical internal gear pump. The complex 3D curved surface of the inner flow channel 3 of the traditional chemical internal gear pump is replaced by two cylindrical curved surfaces.

[0036] The cylindrical surface of ΦA can be machined from the inlet and outlet end faces. In order to allow the intermediate flow channel 5 to be machined when machining the front and rear positioning cavities 2 of the shell, RC≤RB is required. At the same time, in order to make the intermediate flow channel 5 change slowly, L5≥RB / 6.

[0037] This allows the inlet and outlet flow channels 4 and the intermediate flow channel 5 of the pump casing of the internal gear pump to be fully machined through simple rotary machining, thus meeting the requirements for applications with high flow channel smoothness.

[0038] Finally, it should be noted that the above disclosure is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. The scope of this application is limited only by the appended claims.

Claims

1. A pump housing for a fully machined internal gear pump with an internal flow channel, comprising a pump housing (1), characterized in that: The pump casing (1) has a front and rear positioning cavity (2) at its center. The front and rear positioning cavities (2) are connected to a middle flow channel (5) and an inlet and outlet flow channel (4) on both sides. The middle flow channel (5) is connected to the front and rear positioning cavities (2) and the inlet and outlet flow channel (4) on both sides respectively. The inlet and outlet flow channel (4), the middle flow channel (5) and the inner surfaces of the front and rear positioning cavities (2) are cylindrical surfaces that can be rotated.

2. The pump housing of a fully machined internal gear pump with an internal flow channel according to claim 1, characterized in that: The intermediate flow channel (5) intersects and connects with the middle parts of both sides of the front and rear positioning cavities (2).

3. The pump housing of a fully machined internal gear pump with an internal flow channel according to claim 1, characterized in that: The machining radius of the intermediate flow channel (5) is RC, and the machining radius of the front and rear positioning cavities (2) is RB, where RC≤RB.

4. The pump housing of a fully machined internal gear pump with an internal flow channel according to claim 3, characterized in that: The distance from the center of the intermediate flow channel (5) to the positioning center of the pump casing (1) is L5, where L5 ≥ RB / 6.

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