An internal gear pump

Abstract

The utility model discloses an inner meshing gear pump, including the pump shell, the inside of pump shell is hollow, be provided with the outer rotor in the pump shell, be provided with the connecting assembly between pump shell and outer rotor, and the rotation is connected through connecting assembly between pump shell and outer rotor. Connecting assembly includes needle bearing, and the rotation is connected with pump shell through needle bearing to outer rotor. The rotation is connected through connecting assembly between pump shell and outer rotor, changes sliding friction into rolling friction, and its friction coefficient is far lower than sliding friction, reduces abrasion, and the torque required for driving pump is smaller, and more input power is used to produce flow and pressure, instead of overcoming mechanical friction, thereby improving the volumetric efficiency and mechanical efficiency of whole pump, simultaneously, the friction between pump shell and outer rotor is changed into rolling friction, and it is more favorable to improve starting performance under low temperature working condition, simultaneously, the friction between pump shell and outer rotor is changed into rolling friction, prolongs the service life of inner meshing gear pump, and improves the stability of inner meshing gear pump.

Description

Technical Field

[0001] This utility model relates to an internal gear pump, belonging to the technical field of electro-hydraulic motor pump units. Background Technology

[0002] Internal gear pumps utilize the principle of internal gear meshing, with the pitch circles of the inner and outer gears close together on one side, separated by a crescent-shaped plate on the pump cover on the other side. The driving inner gear on the main shaft drives the inner and outer gears to rotate in the same direction. At the inlet, the gears separate to create negative pressure, drawing in liquid. At the outlet, the gears continuously engage and mesh, squeezing the liquid out. Due to this unique structure, it is particularly suitable for conveying high-viscosity media, with a viscosity range of 0.2-1,000,000 cp.

[0003] In electro-hydraulic motor units, it is necessary to ensure the stability of the displacement and high volumetric efficiency of the internal gear pump. However, in existing internal gear pumps, the pump casing and the outer rotor are connected by sliding bearings. Sliding bearings rely on fluid lubrication, resulting in high frictional resistance during startup and continuous frictional losses during operation. Under continuous high-speed operation and high pressure conditions, the pumps suffer from high torque, low efficiency, significant wear, short lifespan, and low operational stability. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an internal gear pump that can reduce friction, improve the efficiency of stable flow output, have good operational stability, improve starting performance, alleviate the problem of large torque under high pressure, and extend service life under continuous high-speed operation and high pressure conditions.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0006] An internal gear pump includes a pump casing, the interior of which is hollow, an outer rotor is disposed inside the pump casing, and a connecting assembly is disposed between the pump casing and the outer rotor, the pump casing and the outer rotor being rotatably connected by the connecting assembly.

[0007] Furthermore, the connecting assembly includes a needle roller bearing, and the outer rotor is rotatably connected to the pump housing via the needle roller bearing.

[0008] Furthermore, an inner rotor is provided inside the outer rotor, and the inner rotor is meshed with the outer rotor. The inner rotor is rotatably connected to the pump casing through a connecting shaft.

[0009] Compared with the prior art, the advantages of this utility model include:

[0010] This utility model provides an internal gear pump in which the pump casing and outer rotor are rotatably connected by a connecting assembly, changing sliding friction into rolling friction. The coefficient of friction is much lower than that of sliding friction, reducing wear and resulting in less torque required to drive the pump. More input power is used to generate flow and pressure instead of overcoming mechanical friction, thereby improving the overall volumetric efficiency and mechanical efficiency of the pump. Simultaneously, changing the friction between the pump casing and outer rotor to rolling friction is more beneficial for improving starting performance under low-temperature conditions. Furthermore, changing the friction between the pump casing and outer rotor to rolling friction extends the service life of the internal gear pump and improves its stability. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a cross-sectional view of an internal gear pump provided in a typical embodiment of this utility model;

[0013] Explanation of reference numerals in the attached drawings: 1. Pump casing; 2. Outer rotor; 3. Connecting assembly; 4. Inner rotor. Detailed Implementation

[0014] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0015] like Figure 1 As shown, this utility model discloses an internal gear pump, including a pump housing 1, the interior of which is hollow. An outer rotor 2 is disposed inside the pump housing 1, and a connecting assembly 3 is provided between the pump housing 1 and the outer rotor 2. The pump housing 1 and the outer rotor 2 are rotatably connected by the connecting assembly 3. Specifically, the connecting assembly 3 may include a needle roller bearing or a roller bearing. Preferably, in this embodiment, the connecting assembly 3 includes a needle roller bearing, and the outer rotor 2 is rotatably connected to the pump housing 1 through the needle roller bearing.

[0016] In this application, the pump casing 1 and the outer rotor 2 are rotatably connected by the connecting assembly 3, changing sliding friction into rolling friction. The coefficient of friction is much lower than that of sliding friction, reducing wear and making the torque required to drive the pump smaller. More input power is used to generate flow and pressure instead of overcoming mechanical friction, thereby improving the volumetric efficiency and mechanical efficiency of the entire pump. At the same time, changing the friction between the pump casing 1 and the outer rotor 2 into rolling friction is more conducive to improving starting performance under low temperature conditions. Furthermore, changing the friction between the pump casing 1 and the outer rotor 2 into rolling friction extends the service life of the internal gear pump and improves its stability.

[0017] In some implementations, an inner rotor 4 is disposed inside the outer rotor 2. The inner rotor 4 is meshed with the outer rotor 2 and is rotatably connected to the pump casing 1 via a connecting shaft. Driven by the connecting shaft, the inner rotor 4 rotates, which in turn drives the outer rotor 2, which is meshed with it, to rotate, thereby causing the outer rotor 2 to rotate relative to the pump casing 1.

[0018] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An internal gear pump, comprising a pump casing (1), characterized in that: The pump casing (1) is hollow inside, and an outer rotor (2) is provided inside the pump casing (1). A connecting component (3) is provided between the pump casing (1) and the outer rotor (2). The pump casing (1) and the outer rotor (2) are rotatably connected by the connecting component (3).

2. The internal gear pump according to claim 1, characterized in that: The connecting assembly (3) includes a needle roller bearing, and the outer rotor (2) is rotatably connected to the pump housing (1) via the needle roller bearing.

3. The internal gear pump according to claim 1, characterized in that: The outer rotor (2) is provided with an inner rotor (4) inside. The inner rotor (4) is meshed with the outer rotor (2). The inner rotor (4) is rotatably connected to the pump casing (1) through a connecting shaft.

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