Double-oil-duct internal gear pump

Abstract

The utility model relates to the technical field of gear pumps, in particular to a double-oil-duct internal gear pump, and according to the scheme, the oil supply efficiency and reliability of the gear pump are remarkably improved through the double-way collaborative oil supply design of a main oil duct and an auxiliary oil duct; the main oil duct directly supplies oil to a gear meshing core area to ensure stable lubrication under the high-pressure working condition, and the auxiliary oil duct is communicated with the inner cavity through the side wall to supplement oil from the periphery, so that the cavitation phenomenon during high-speed operation is effectively avoided, and the technical problem that a traditional gear pump is insufficient in oil supply under the high-pressure and high-speed working condition is effectively solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gear pumps, in particular to a double-oil-channel internal meshing gear pump. BACKGROUND

[0002] As an important hydraulic power element, the internal meshing gear pump is widely used in various mechanical equipment. Its main working process can be divided into three stages: first, a low-pressure cavity is formed in the area where the gears are disengaged, and the oil is sucked in through the middle oil channel; second, as the gears rotate, the oil is enclosed in the intertooth volume and transported forward; finally, when the gears engage again, the oil is extruded and discharged from the oil outlet.

[0003] The traditional internal meshing gear pump usually adopts a single middle oil channel design, and the oil enters the pump cavity only through the oil inlet at the center position. Although this structure can meet the basic oil supply requirements, under high-speed or large-flow working conditions, a single oil inlet channel often leads to insufficient oil supply, especially in the gear meshing area, which may cause local oil supply to be not timely, thereby reducing the working efficiency of the pump and possibly causing cavitation, vibration and noise, affecting the stable operation of the entire hydraulic system. In view of the deficiencies of the prior art, there is an urgent need in the industry to develop a new internal meshing gear pump structure. CONTENT OF THE INVENTION

[0004] In order to improve the oil supply efficiency, the application provides a double-oil-channel internal meshing gear pump.

[0005] The double-oil-channel internal meshing gear pump provided by the application adopts the following technical scheme:

[0006] A double-oil-channel internal meshing gear pump, comprising a pump body, a rotating shaft assembly, an outer gear ring and a pump cover, the rotating shaft assembly comprising a rotating shaft and an internal gear sleeved on the rotating shaft;

[0007] An inner cavity is formed in the upper end of the pump body, a crescent partition plate is protruded in the inner cavity, the rotating shaft assembly and the outer gear ring are embedded in the inner cavity, the internal gear abuts against the inner wall of the crescent partition plate, the outer gear ring abuts against the outer wall of the crescent partition plate, and the internal gear and the outer gear ring are eccentrically engaged;

[0008] Main oil channels are formed in the bottom wall of the inner cavity at both ends of the crescent partition plate, an auxiliary oil channel is formed in the upper end of the pump body, and the side wall of the auxiliary oil channel is in communication with the inner cavity;

[0009] An oil inlet is formed in the side wall of the pump cover, a main oil outlet is formed in the middle of the lower end of the pump cover, an auxiliary oil outlet corresponding to the position of the auxiliary oil channel is formed in the side of the lower end of the pump cover, and the main oil outlet, the auxiliary oil outlet and the oil inlet are in communication.

[0010] By adopting the technical scheme, the oil supply efficiency and reliability of the gear pump are improved by the double-path collaborative oil supply design of the main oil channel and the auxiliary oil channel; the main oil channel directly supplies oil to the meshing core area of the gear, ensuring stable lubrication under high-pressure working conditions, and the auxiliary oil channel supplements oil from the periphery by communicating with the inner cavity through the side wall, effectively avoiding the cavitation phenomenon during high-speed operation.

[0011] Optionally, a plurality of through holes are arranged in the plate surface of the inner gear.

[0012] By adopting the technical scheme, the through holes promote the rapid diffusion of oil to the meshing area, enhance the edge lubrication effect, and further improve the oil supply uniformity.

[0013] Optionally, the rotating shaft is integrally arranged with the inner gear.

[0014] By adopting the technical scheme, the integrated design eliminates the assembly gap of the traditional split structure, improves the transmission accuracy and structural rigidity, reduces the axial installation space requirement, and makes the pump body more compact, facilitating integration into small-sized equipment.

[0015] Optionally, a vertical flow guide groove is arranged at the upper end of the pump body, and the vertical flow guide groove is in communication with the main oil channel.

[0016] By adopting the technical scheme, the vertical flow guide groove optimizes the oil flow path of the main oil channel, ensures accurate delivery of oil to the high-pressure sensitive point of the meshing area, and improves the oil supply efficiency of the core area.

[0017] Optionally, a lower damping hole is arranged at the upper end of the pump body, an upper damping hole matched with the lower damping hole is arranged at the lower end of the pump cover, and the lower damping hole is in communication with the inner cavity.

[0018] By adopting the technical scheme, when the gear pump is running, high-pressure oil enters the sealed chamber formed by the pump cover and the pump body, and forms a dynamic pressure field under the throttling action of the damping hole. During operation, the outer gear ring is offset to the outside under the action of centrifugal force, the volume of the side chamber is compressed, forcing the oil in the chamber to flow through the damping hole, thereby generating a hydraulic counterforce opposite to the flow direction. This counterforce is transmitted to the outer gear ring through the pressure chamber, forming a balanced thrust opposite to the direction of the centrifugal force. This design cleverly utilizes the hydraulic energy of the system to achieve dynamic balance, avoiding the space occupation of the traditional mechanical limiting structure, and ensuring that the outer gear ring is always in the best working position through the fluid self-regulating characteristics, improving the operation stability while maintaining the compactness of the overall structure.

[0019] In conclusion, the beneficial technical effects of the present application are as follows: the double-oil-channel meshing gear pump provided by the present application realizes three-dimensional efficient lubrication of the gear meshing area through innovative design of the main oil channel and the auxiliary oil channel for collaborative oil supply, the main oil channel directly ensures oil supply in the core working area, and the auxiliary oil channel supplements oil from the side, effectively eliminating the cavitation phenomenon during high-speed operation; at the same time, the vertical flow guide groove and the through hole are designed, which further improves the oil supply efficiency and solves the technical problem of insufficient oil supply of the traditional gear pump under high-pressure and high-speed working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a whole structure diagram of the double-oil-channel meshing gear pump.

[0021] Figure 2 is an exploded schematic view of the double-oil-channel meshing gear pump.

[0022] Figure 3 is a schematic view of the cooperation of the pump body, the rotating shaft assembly and the outer gear ring.

[0023] Figure 4 is a structure diagram of the pump cover.

[0024] Figure 5 is a structure diagram of the pump body.

[0025] BRIEF DESCRIPTION OF DRAWINGS: 1, pump body; 11, inner cavity; 12, crescent partition plate; 13, main oil channel; 14, vertical flow guide groove; 15, auxiliary oil channel; 16, lower damping hole; 2, rotating shaft assembly; 21, rotating shaft; 22, inner gear; 23, through hole; 3, outer gear ring; 4, pump cover; 41, oil inlet; 42, main oil outlet; 43, auxiliary oil outlet; 44, upper damping hole. DETAILED DESCRIPTION

[0026] The following will be described in detail with reference to the accompanying drawings. Figures 1-5 The present application will be further described in detail.

[0027] The embodiment of the present application discloses a double-oil-channel meshing gear pump. Referring to Figures 1 to 3 , the double-oil-channel meshing gear pump comprises a pump body 1, a rotating shaft assembly 2, an outer gear ring 3 and a pump cover 4, the rotating shaft assembly 2 comprises a rotating shaft 21 and an inner gear 22 sleeved in the middle part of the rotating shaft 21, and the inner gear 22 is integrally formed with the rotating shaft 21, so as to eliminate the assembly gap of the traditional split structure and improve the transmission precision and structural rigidity.

[0028] The upper end of the pump body 1 is provided with an inner cavity 11, the rotating shaft assembly 2 and the outer gear ring 3 are embedded in the inner cavity 11 and can rotate in the inner cavity 11. The inner cavity 11 is integrally formed with a crescent partition plate 12, the inner gear 22 abuts the inner wall of the crescent partition plate 12, the outer gear ring 3 abuts the outer wall of the crescent partition plate 12, and the inner gear 22 and the outer gear ring 3 are eccentrically engaged. After the rotating shaft assembly 2 and the outer gear ring 3 are installed, the pump cover 4 is fixed on the pump body 1 by bolts.

[0029] A plurality of through holes 23 are arranged at intervals on the plate surface of the inner gear 22. During oil supply, the design of the through holes 23 promotes the rapid diffusion of oil to the meshing area, enhances the edge lubrication effect, and further improves the oil supply efficiency and uniformity.

[0030] In combination with Figure 4 and Figure 5 , the side wall of the pump cover 4 is provided with an oil inlet 41, the lower end of the pump cover 4 is provided with a main oil outlet 42, the side of the lower end of the pump cover 4 is provided with an auxiliary oil outlet 43, and the main oil outlet 42, the auxiliary oil outlet 43 and the oil inlet 41 are connected.

[0031] The bottom wall of the inner cavity 11 is provided with a main oil channel 13 at both ends of the crescent partition plate 12, and the upper end of the pump body 1 is provided with a vertical flow guide groove 14, which is connected with the main oil channel 13. The main oil channel 13 directly supplies oil to the gear meshing core area, ensuring stable lubrication under high pressure working conditions, and the vertical flow guide groove 14 optimizes the oil flow path, ensuring accurate delivery of oil to the high pressure sensitive point of the meshing area, and improving the oil supply efficiency of the core area.

[0032] The upper end of the pump body 1 is provided with an auxiliary oil channel 15, and the side wall of the auxiliary oil channel 15 is connected with the inner cavity 11. The position of the auxiliary oil channel 15 corresponds to the position of the auxiliary oil outlet 43, and when the pump cover 4 covers the pump body 1, the auxiliary oil channel 15 is in close contact with the auxiliary oil outlet 43. The auxiliary oil channel 15 is connected with the inner cavity 11 through the side wall to supplement oil from the periphery, effectively avoiding the cavitation phenomenon during high-speed operation.

[0033] The upper end of the pump body 1 is provided with a lower damping hole 16, and the lower end of the pump cover 4 is provided with an upper damping hole 44 matched with the lower damping hole 16, and the lower damping hole 16 is connected with the inner cavity 11. When the gear pump is running, this design makes the pump body 1 generate a hydraulic counter force opposite to the direction of oil flow, which is transmitted to the outer gear ring 3 to form a balanced thrust opposite to the direction of centrifugal force, thereby reducing the deviation tendency of the outer gear ring 3.

[0034] The implementation principle of the double-oil-channel meshing gear pump according to the embodiment of the application is that oil enters from the oil inlet 41 of the side wall of the pump cover 4 and flows out from the main oil outlet 42 and the auxiliary oil outlet 43, and is divided into main oil path oil and auxiliary oil path oil.

[0035] The main oil passage directly delivers oil to the meshing core area to realize high-pressure directional oil supply. At the same time, the auxiliary oil passage delivers oil to the auxiliary oil channel 15 through the auxiliary oil outlet 43, and the oil is supplemented to the periphery of the meshing area through the side wall communication port. When the inner gear 22 drives the outer gear ring 3 to rotate, the oil in the main oil channel 13 fills the intermeshing volume from the bottom, and the oil in the auxiliary oil channel 15 penetrates from the side, forming a three-dimensional oil supply network.

[0036] The specially designed damping hole system automatically generates a balance force through hydraulic feedback when the gear ring rotates, offsets the deviation of the outer gear ring 3 caused by the centrifugal force, and realizes stable and efficient hydraulic delivery in a compact structure.

[0037] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A double-oil passage internal gear pump characterized by: Including pump body (1), rotating shaft assembly (2), outer gear ring (3) and pump cover (4), rotating shaft assembly (2) includes rotating shaft (21) and inner gear (22) sleeved with rotating shaft (21); The upper end of the pump body (1) is provided with an inner cavity (11), the inner cavity (11) is provided with a crescent partition (12), the rotating shaft assembly (2) and the outer gear ring (3) are embedded in the inner cavity (11), the inner gear (22) abuts the inner wall of the crescent partition (12), the outer gear ring (3) abuts the outer wall of the crescent partition (12), and the inner gear (22) and the outer gear ring (3) are eccentrically engaged; The bottom wall of the inner cavity (11) is provided with a main oil channel (13) at both ends of the crescent partition (12), the upper end of the pump body (1) is provided with an auxiliary oil channel (15), the side wall of the auxiliary oil channel (15) is communicated with the inner cavity (11); The side wall of the pump cover (4) is provided with an oil inlet (41), the lower end of the pump cover (4) is provided with a main oil outlet (42), the lower end of the pump cover (4) is provided with an auxiliary oil outlet (43) corresponding to the position of the auxiliary oil channel (15), the main oil outlet (42), the auxiliary oil outlet (43) and the oil inlet (41) are communicated.

2. A double-oil passage internal gear pump according to claim 1, characterized in that: The plate surface of the inner gear (22) is provided with a plurality of through holes (23).

3. A double-oil passage internal gear pump according to claim 1, characterized in that: The rotating shaft (21) and the inner gear (22) are integrally arranged.

4. A double-oil passage internal gear pump according to claim 1, characterized in that: The upper end of the pump body (1) is provided with a vertical flow guide groove (14), the vertical flow guide groove (14) is communicated with the main oil channel (13).

5. A double-oil passage internal gear pump according to claim 1, characterized in that: The upper end of the pump body (1) is provided with a lower damping hole (16), the lower end of the pump cover (4) is provided with an upper damping hole (44) matched with the lower damping hole (16), the lower damping hole (16) is communicated with the inner cavity (11).

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