Lubricating oil pump for high-speed pumps

Abstract

The application discloses a lubricating oil pump for high-speed pump, which comprises a pump body, an internal cavity of the pump body is divided into an upper cavity and a lower cavity, and the pump body is provided with an intake cavity and a discharge cavity on opposite sides and communicated with the upper cavity; a driving wheel comprising an internal gear and a connecting shaft connected to the bottom of the internal gear, the internal gear is treated by nitriding, the internal gear is installed in the upper cavity of the pump body in an inverted mode, the connecting shaft passes through the lower cavity of the pump body and is partially exposed; a driven wheel comprising an external gear engaged with the internal gear, the external gear is made of iron-based powder metallurgy, the external gear is arranged eccentrically with the internal gear, and the number of teeth of the internal gear is more than that of the external gear; a pump cover, a partition block is formed at the bottom of the pump cover, the partition block is located between the external gear and the internal gear, and the bottom of the pump cover is further provided with a first groove and a second groove communicated with the intake cavity and the discharge cavity respectively. The hardness of the surface of the internal gear of the driving wheel after nitriding treatment is much higher than that of the external gear of the driven wheel, which can effectively resist external friction and scratching and reduce surface wear.

Description

Technical Field

[0001] This utility model relates to the field of lubricating oil pumps and machining technology, specifically to a lubricating oil pump for high-speed pumps. Background Technology

[0002] High-speed lubricating oil pumps are key components in high-speed centrifugal pump systems, primarily used to provide forced lubrication for high-speed rotating parts such as gearboxes and bearings, ensuring long-term stable operation of the equipment. Currently, most high-speed lubricating oil pumps on the market are either gear pumps or screw pumps. For pumping non-corrosive liquids such as lubricating oil, forged steel or copper alloys are preferred.

[0003] Forged steel is high in strength, wear-resistant, and heat-resistant, but it is heavy and has poor thermal conductivity. Copper alloys are wear-resistant, corrosion-resistant, have good thermal conductivity, and good self-lubricating properties, but they are expensive and have low strength. To address these shortcomings, further technological improvements are needed to enhance the performance, convenience, and reliability of high-speed lubricating oil pumps. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a lubricating oil pump for high-speed pumps.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A high-speed pump for use with lubricating oil, comprising: The pump body has an internal chamber, which is divided into an upper chamber and a lower chamber that runs through the pump body. The pump body also has a suction chamber and a discharge chamber on opposite sides that communicate with the upper chamber. The suction chamber is connected to the oil inlet and the discharge chamber is connected to the oil outlet. The drive wheel includes an internal gear and a connecting shaft connected to its bottom. The inner surface of the internal gear is nitrided. The internal gear is installed upside down in the upper cavity of the pump body. The connecting shaft passes through the lower cavity of the pump body and is partially exposed. Driven gear, including an external gear meshing with an internal gear, the external gear being made of iron-based powder metallurgy, the external gear being eccentrically arranged with respect to the internal gear, and the internal gear having more teeth than the external gear; A pump cover is disposed on the pump body and seals the chamber. Its bottom part extends downward to form a partition. The partition is located between the external gear and the internal gear and is used to separate the suction chamber and the discharge chamber. The bottom of the pump cover is also provided with a first groove and a second groove, which respectively connect the suction chamber and the discharge chamber, so that the upper cavity of the pump body is connected to the suction chamber and the discharge chamber through the first groove and the second groove.

[0006] The pump body has a bushing in its lower cavity, and the connecting shaft passes through the bushing.

[0007] The inner wall of the bushing is provided with a spiral oil groove.

[0008] The bottom of the connecting shaft is integrally formed with a transmission key for connecting the oil pump coupling.

[0009] The upper surface of the pump body is a sealing surface, and a sealing gasket is provided between the pump cover and the sealing surface.

[0010] The driven wheel is mounted on the pump cover via a spindle.

[0011] The external gear is provided with an inner bushing, and the spindle passes through the inner bushing.

[0012] The inner liner is made of tin bronze.

[0013] The beneficial effects of this utility model are: After nitriding, the hardness of the inner gear of the driving gear is much higher than that of the outer gear of the driven gear. This can effectively resist external friction and scratches and reduce surface wear. At the same time, the outer gear forms a lubricating film during friction, which reduces the coefficient of friction and reduces the adhesive wear of hard materials. The combination of hard and soft materials significantly improves wear resistance.

[0014] The driven gear external gear is made of iron-based powder metallurgy, which makes it less prone to breakage and tooth chipping during use. When the driven gear external gear wears, the powder particles produced by the wear are very small due to the material properties of iron-based powder metallurgy, preventing problems such as oil pump gear jamming or high-speed pump injector blockage. This greatly reduces the failure rate of the oil pump and high-speed pump and extends their service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall assembly of the lubricating oil pump in this embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional view of the pump body in an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the pump cover in an embodiment of the present invention. The left side is the main view and the right side is the sectional view.

[0018] Figure 4 This is a schematic diagram of the drive wheel structure in an embodiment of this utility model.

[0019] Figure 5 This is a structural schematic diagram of the driven wheel in an embodiment of the present invention. The left side is a front view of the driven wheel, and the right side is a cross-sectional schematic diagram of the driven wheel.

[0020] Figure 6 This is a schematic diagram of the bushing structure in an embodiment of the present invention. The left side is a cross-sectional view of the bushing, and the right side is a front view of the bushing.

[0021] Figure 7 This is a schematic diagram of the installation of the driving wheel and the driven wheel in an embodiment of this utility model. The left side is the main view and the right side is the top view. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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.

[0024] like Figure 1 As shown, this utility model discloses a high-speed pump for lubricating oil, which is mainly composed of pump body 1, pump cover 2, drive wheel 6, driven wheel 7, spindle 8 and bushing 10.

[0025] like Figure 2 As shown, the pump body 1 is the main structural component of this embodiment. It has a cavity machined inside. The cavity is divided into an upper pump body cavity 102 and a lower pump body cavity 103 that penetrates the pump body 1. The lower pump body cavity 103 is provided with a through hole that penetrates the pump body 1. The upper end of the upper pump body cavity is open and the lower end is connected to the lower pump body cavity. The pump body 1 has a suction cavity and a discharge cavity on opposite sides that are connected to the upper pump body cavity 102. The suction cavity is connected to the oil inlet and the discharge cavity is connected to the oil outlet. The upper end surface of the pump body 1 is precision machined to form a flat sealing surface 101.

[0026] like Figure 4 As shown, the drive wheel 6 is the power input and main transmission component of the pump body. Its upper part is an internal gear 603. The inner surface of the internal gear 603 is nitrided to form an extremely hard alloy nitride, providing a comprehensive advantage over ordinary gears in terms of high wear resistance, long fatigue life, and dimensional stability. The bottom center of the internal gear and the connecting shaft 602 are integrally formed by forging, ensuring transmission strength and concentricity. A transmission key 601 is machined at the bottom of the connecting shaft for connecting the oil pump coupling. The entire drive wheel is installed upside down in the upper cavity 102 of the pump body with the internal gear 603 facing upwards, while the connecting shaft 602 passes downwards through the lower cavity 103 of the pump body.

[0027] like Figure 5As shown, the driven wheel 7 includes an external gear 701 that meshes with the internal gear 603. The external gear 701 is manufactured as a whole using iron-based powder metallurgy, achieving a tensile strength more than three times that of die-cast alloys. Furthermore, its friction-reducing performance can be further enhanced through an impregnation process with lubricating oil. When the external gear 701 wears during operation, the wear-generated powder particles are extremely small due to the inherent properties of iron-based powder metallurgy, preventing problems such as oil pump gear jamming or clogging of the high-speed pump nozzle. Simultaneously, the use of iron-based powder metallurgy in manufacturing parts achieves a material utilization rate of over 95%, significantly reducing raw material waste. The driven wheel 7 is mounted to the pump cover 2 via a spindle 8. A bushing 10 is provided in the lower cavity of the pump body, and the bushing 10 is installed and fixed in the lower cavity 103 of the pump body using a hot-and-cold fitting method. The connecting shaft 602 passes through the bushing 10. An inner bushing 702, preferably made of tin bronze, is also provided in the central through-hole of the external gear. During friction, a lubricating film is formed, significantly reducing the wear rate. Its coefficient of friction can be as low as 0.01-0.02, which is more than 30% higher than that of ordinary brass. Ordinary alloy steel bushings require external lubrication and are prone to rapid wear under dry friction.

[0028] The mandrel is installed and fixed on the pump cover by a hot and cold insert method. The driven wheel 7 is installed and positioned by passing the mandrel 8 through the inner bushing 702 and then fixing it in the corresponding mounting hole 202 of the pump cover 2.

[0029] like Figure 7 As shown, the external gear 701 of the driven wheel 7 meshes with the internal gear 603 of the driving wheel 6, but there is a certain eccentricity between their centers, and the number of teeth of the internal gear 603 is greater than that of the external gear 701, thus forming a highly efficient internal meshing pair with a small tooth difference.

[0030] The pump cover 2 is fixed to the sealing surface 101 of the pump body 1 by bolts. A sealing gasket 5 is provided between the pump cover 2 and the sealing surface 101 to ensure the sealing of the joint surface. The pump cover 2 and the pump body 1 are connected and fixed by bolts 3 and spring washers 4. Finally, the cylindrical pin 9 is installed into the pin hole 201 of the upper cover.

[0031] like Figure 3 As shown, the bottom part of the pump cover 2 extends downward to form a partition 203. The partition 203 is positioned exactly in the non-meshing area between the driving wheel and the driven wheel, and is used to separate the suction chamber and the discharge chamber. The bottom of the pump cover is also provided with a first groove 204 and a second groove 205, which respectively connect the suction chamber and the discharge chamber, so that the upper cavity of the pump body is connected to the suction chamber and the discharge chamber through the first groove and the second groove, forming a key flow channel for lubricating oil to enter the pump chamber from the suction chamber and flow from the pump chamber to the discharge chamber.

[0032] When the lubricating oil pump is running, the eccentric design of the internal gear 603 separates the suction and discharge chambers through a partition, making the pump body structure more compact, smaller in size, and lighter in weight. The eccentric design of the internal gear 603 significantly reduces flow pulsation and noise compared to external gear pumps, effectively reducing vibration and noise. Simultaneously, because the internal gear 603 and external gear 701 rotate in the same direction, their relative sliding speed is lower, resulting in less wear and extending the service life of the lubricating oil pump. The eccentric design also reduces mechanical friction loss by optimizing the gear meshing process.

[0033] like Figure 6 As shown, the inner wall of the bushing is provided with a spiral oil groove 1001. The bushing 10 is also made of tin bronze, which is more wear-resistant than ordinary alloy steel. The spiral oil groove 1001 is also machined into the inner cavity to guide the lubricating oil in the lubricating oil pump cavity into the spiral oil groove 1001, making its lubrication performance superior and less prone to dry friction due to oil loss. That is, when the connecting shaft 602 rotates, the lubricating oil is continuously carried into the mating surface of the shaft and the bushing by means of the spiral pumping principle, forming a lubricating film, which plays a role in lubrication and cooling.

[0034] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A lubricating oil pump for high-speed pumps, characterized in that: It includes: The pump body (1) has a chamber inside, which is divided into an upper chamber (102) and a lower chamber (103) that penetrates the pump body (1). The pump body (1) has a suction chamber and a discharge chamber that communicate with the upper chamber (102) on opposite sides. The suction chamber is connected to the oil inlet and the discharge chamber is connected to the oil outlet. The drive wheel (6) includes an internal gear (603) and a connecting shaft (602) connected to its bottom. The inner surface of the internal gear (603) is nitrided. The internal gear (603) is installed upside down in the upper cavity (102) of the pump body. The connecting shaft (602) passes through the lower cavity (103) of the pump body and is partially exposed. Driven wheel (7) includes an external gear (701) that meshes with an internal gear (603). The external gear is made of iron-based powder metallurgy. The external gear (701) is eccentrically arranged with the internal gear (603), and the internal gear (603) has more teeth than the external gear (701). The pump cover (2) is disposed on the pump body (1) and closes the chamber. Its bottom part extends downward to form a partition. The partition is located between the external gear (701) and the internal gear (603) and is used to separate the suction chamber and the discharge chamber. The bottom of the pump cover is also provided with a first groove and a second groove, which respectively connect the suction chamber and the discharge chamber, so that the upper chamber of the pump body is connected to the suction chamber and the discharge chamber through the first groove and the second groove.

2. The high-speed pump lubricating oil pump according to claim 1, characterized in that: The pump body lower cavity (103) is provided with a bushing (10), and the connecting shaft (602) passes through the bushing (10).

3. The high-speed pump lubricating oil pump according to claim 2, characterized in that: The inner wall of the bushing is provided with a spiral oil groove (1001).

4. The high-speed pump lubricating oil pump according to claim 1, characterized in that: The bottom of the connecting shaft (602) is integrally formed with a transmission key (601) for connecting the oil pump coupling.

5. The high-speed pump for lubricating oil as described in claim 1, characterized in that: The upper end face of the pump body is a sealing surface (101), and a sealing gasket (5) is provided between the pump cover (2) and the sealing surface (101).

6. The high-speed pump lubricating oil pump according to claim 1, characterized in that: The driven wheel (7) is mounted on the pump cover (2) via a spindle (8).

7. The high-speed pump lubricating oil pump according to claim 6, characterized in that: The external gear (701) is provided with an inner bushing (702), and the spindle (8) passes through the inner bushing (702).

8. The high-speed pump lubricating oil pump according to claim 7, characterized in that: The inner liner (702) is made of tin bronze.

Images