High-speed internal gear pump integrated with centrifugal hole type booster pump

Abstract

A high-speed internal gear pump integrated with a centrifugal hole type booster pump aims to solve the problems of insufficient oil absorption, low efficiency and incompact structure of a hydraulic power unit under high rotating speed in the prior art, an end cover (1) is located at the front end of the pump, an oil outlet (1c) is formed in the top of the pump, and four threaded holes with the same size are formed in the periphery of the pump and used for flange connection; the sealing ring (2) is connected to the left end of the cavity (4) through a screw and is sealed through the first sealing ring (2); the pump core (3) of the internal gear pump is arranged on the left side of the centrifugal hole type booster pump (5) and is connected with the centrifugal hole type booster pump (5) through a spline (5a); an oil inlet (4e) is formed in the top of the cavity (4), and threaded holes are formed in the left side and the right side of the cavity (4) and connected with the end cover (1) and the base (11) respectively. The centrifugal hole type booster pump (5) is integrated on an oil suction path of the high-speed internal gear pump, and a right end shaft is provided with a flat key groove (5d) used for being connected with a motor through a coupler; the double-row angular contact ball bearing (9) is embedded in the base, is matched with a main shaft of the centrifugal hole type booster pump (5) and is positioned through a check ring; the base (11) is located on the rightmost side of the device, a double-row angular contact ball bearing (9) and a rotating shaft lip-shaped oil seal (10) are embedded in the base (11), the base (11) is connected with the cavity (4) through four evenly-distributed screw holes, and sealing is achieved through a second sealing ring (8).

Description

Technical Field

[0001] The utility model relates to an electro-hydraulic integrated hydraulic power unit, in particular to a high-speed internal meshing gear pump technology integrated with a centrifugal hole type booster pump. Background Art

[0002] Internal gear pumps are widely used in machine tools, agricultural machinery, aviation and other fields due to their compact structure, small flow pulsation, long service life and low noise. However, with the development of high speed, the gas in the medium of the internal gear pump is obviously precipitated at high speed, and it is easy to have cavitation phenomenon, which leads to insufficient oil suction of the internal gear pump and reduced volumetric efficiency. Therefore, it is of great significance to improve the oil suction capacity of the internal gear pump under high speed conditions and improve the volumetric efficiency.

[0003] Chinese patent (CN203321817U) discloses a multi-stage parallel internal meshing gear pump, which is provided with a parallel and symmetrical I-stage driving shaft and a II-stage driving shaft in structure, and the I and II-stage inner and outer rotors are connected at the corresponding positions respectively; when working, the transmission shaft drives the other two driving shafts to rotate synchronously through the synchronous gear, and then the driving shaft drives the internal and external gears to mesh, and the medium is pressurized by the multi-stage gears in turn, thereby achieving an inlet and outlet pressure difference higher than that of a single-stage pump, overcoming the disadvantage of low pressure of a single-stage pump and realizing high-pressure delivery. Chinese patent (CN117345613A) discloses an internal meshing high-pressure gear pump group, which includes two gear pumps and a main pump body. The gear pumps are connected in series to form a pump group through the pump shaft in sequence to form a continuous oil supply path. The gear pumps in series form greatly increase the pump oil pressure and improve the pump oil efficiency.

[0004] The prior art has the following shortcomings: Although the multi-stage parallel design of the patent (CN203321817U) can increase the pressure, the efficiency improvement is limited. Each gear pump will produce a certain amount of energy loss. After the multi-stage parallel connection, the energy loss is accumulated, resulting in a decrease in overall efficiency; the series gear pump of the patent (CN117345613A) will cause increased vibration and noise, affecting the smooth operation of the pump group and making the processing difficult. The two solutions have the common shortcomings of occupying a large space, complex and non-compact structure, difficult assembly, and high noise and vibration. Summary of the invention

[0005] The utility model aims to solve the problems of insufficient oil absorption, low efficiency and non-compact structure of the hydraulic power unit at high speed in the prior art.

[0006] The utility model is a high-speed internal gear pump integrated with a centrifugal hole type booster pump, comprising an end cover 1, a first sealing ring 2, an internal gear pump core 3, a cavity 4, a centrifugal hole type booster pump 5, an elastic retaining ring 6 for the hole, an elastic retaining ring 7 for the shaft, a second sealing ring 8, a double-row angular contact ball bearing 9, a rotating shaft lip seal 10, and a base 11. The end cover 1 is located at the front end of the pump, and is provided with an oil outlet 1c on the top. Four threaded holes of the same size are provided around it for flange connection. It is connected to the left end of the cavity 4 by screws and sealed by the first sealing ring 2; the internal gear pump core 3 is installed on the left side of the centrifugal hole type booster pump 5, and is connected to the centrifugal hole type booster pump 5 by a spline 5a; an oil inlet 4e is provided on the top of the cavity 4, and threaded holes are provided on the left and right sides to connect to the end cover 1 and the base 11 respectively; the centrifugal hole type booster pump 5 is integrated in the high-speed The oil suction circuit of the internal gear pump, the main shaft 5c of the centrifugal hole type booster pump 5 and the centrifugal hole 5f are an integrated structure, and the right end shaft is provided with a flat keyway 5d for connecting the motor through a coupling; the double-row angular contact ball bearing 9 is embedded in the base, cooperates with the booster pump main shaft, and is positioned by a retaining ring; the base 11 is located on the far right side of the device, and is embedded with a double-row angular contact ball bearing 9 and a rotating shaft lip seal 10, which is connected to the cavity 4 through four evenly distributed screw holes, and is sealed by a second seal 8.

[0007] The utility model has the following beneficial effects: in the utility model, the high-speed internal meshing gear pump structure integrated with the centrifugal hole type booster pump is more compact than the traditional structure, simple to assemble, and low in manufacturing cost, and can achieve efficient boosting in a smaller space; the advantage of this solution is that no significant changes to the main structure of the gear pump are required, and the internal meshing gear pump and the booster pump are connected by splines, so the speed matching is more flexible, and the booster pump and the internal meshing gear pump can rotate at the same axis and speed, and the booster pump can be frequency-controlled according to the flow demand of the internal meshing gear pump, which can maximize the improvement of the oil suction capacity while reducing energy consumption; the main shaft of the booster pump The integrated structural design with centrifugal holes has a compact structure. The booster centrifugal holes with a certain inclination are evenly distributed on the disc. The rotating centrifugal force is used to increase the pressure at the oil inlet of the main pump, thereby improving the oil suction performance of the main pump. An oil suction window is opened on the isolation plate of the cavity to ensure the concentration of oil suction and improve the oil pumping efficiency. The crescent plate is integrated on the low-pressure side plate, which reduces the processing difficulty of the pump body and "transfers" the vulnerable mating surfaces to the high- and low-pressure side plates and the stator ring, which can reduce maintenance costs. In addition, the heat treatment / painting area of ​​the mating surfaces is reduced, saving manufacturing costs. The pump core is plug-in connected to the spline shaft, which is more convenient for installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of the utility model. Figure 2 This is a schematic diagram of the exploded three-dimensional structure of the internal gear pump core. Figure 3 is a schematic diagram of the end cover structure. Figure 4 is a schematic diagram of the cavity structure;

[0009] Figure 5 is a schematic cross-sectional view of the cavity. Figure 6 This is a schematic diagram of the structure of a centrifugal hole booster pump. Figure 7 This is a schematic diagram of a centrifugal hole type booster pump. Figure 8 Schematic diagram of the base structure, with reference numerals and corresponding names: end cover 1, end cover screw hole 1a, first threaded hole 1b, oil outlet 1c, first sealing ring 2, internal gear pump core 3, rectangular sealing ring 3a, high-pressure side plate 3b, positioning pin 3c, copper sleeve 3d, pinion 3e, gear ring 3f, stator ring 3g, low-pressure side plate 3h, crescent plate 3i, screw 3j, cavity 4, second threaded hole 4a, oil suction window 4b, positioning hole 4c, first sealing groove 4d, oil inlet 4e, base Seat mounting groove 4f, pump core mounting groove 4g, centrifugal hole type booster pump mounting groove 4h, second sealing groove 4i, centrifugal hole type booster pump 5, spline 5a, disc 5b, main shaft 5c, flat key groove 5d, bearing limit groove 5e, booster centrifugal hole 5f, hole elastic retaining ring 6, shaft elastic retaining ring 7, second sealing ring 8, double row angular contact ball bearing 9, rotating shaft lip sealing ring 10, base 11, retaining ring groove 11a, bearing mounting groove 11b, lip oil seal mounting groove 11c, rib plate 11d. DETAILED DESCRIPTION

[0010] The following describes the principles and features of the utility model in conjunction with the accompanying drawings, and clearly and completely describes the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] like Figures 1 to 8As shown, the utility model is a high-speed internal gear pump integrated with a centrifugal hole type booster pump, comprising an end cover 1, a first sealing ring 2, an internal gear pump core 3, a cavity 4, a centrifugal hole type booster pump 5, an elastic retaining ring for the hole 6, an elastic retaining ring for the shaft 7, a second sealing ring 8, a double-row angular contact ball bearing 9, a rotating shaft lip seal 10, and a base 11. The end cover 1 is located at the front end of the pump, and is provided with an oil outlet 1c on the top. Four threaded holes of the same size are provided around it for flange connection. It is connected to the left end of the cavity 4 by screws and sealed by the first sealing ring 2; the internal gear pump core 3 is installed on the left side of the centrifugal hole type booster pump 5, and is connected to the centrifugal hole type booster pump 5 by a spline 5a; an oil inlet 4e is provided on the top of the cavity 4, and threaded holes are provided on the left and right sides to connect to the end cover 1 and the base 11 respectively; the centrifugal hole type booster pump 5 is integrated in the high-speed The oil suction circuit of the internal gear pump, the main shaft 5c of the centrifugal hole type booster pump 5 and the centrifugal hole 5f are an integrated structure, and the right end shaft is provided with a flat keyway 5d for connecting the motor through a coupling; the double-row angular contact ball bearing 9 is embedded in the base, cooperates with the booster pump main shaft, and is positioned by a retaining ring; the base 11 is located on the far right side of the device, and is embedded with a double-row angular contact ball bearing 9 and a rotating shaft lip seal 10, which is connected to the cavity 4 through four evenly distributed screw holes, and is sealed by a second seal 8.

[0012] The rectangular sealing ring 3a of the pump core 3 of the internal gear pump is located at the front end of the high-pressure side plate 3b, and contacts with the end cover 1 to form a seal during assembly; the pinion 3e and the gear ring 3f constitute an internal gear pair, and the two together with the stator ring 3g constitute the pump core body; the high-pressure side plate 3b and the low-pressure side plate 3h respectively cover the two sides of the pump core, and a crescent plate 3i is placed in the middle; the entire device is connected by screws 3j, and the positioning pin 3c ensures the accurate position of the device connection.

[0013] The axial dimension of the stator ring 3g determines the size of the end face friction pair clearance, and a reasonable dimension ensures the degree of friction and wear of the end face; the crescent plate 3i is integrated on the low-pressure side plate 3h, which reduces the processing difficulty of the pump body and "transfers" the vulnerable mating surfaces to the high- and low-pressure side plates and the stator ring, which can reduce maintenance costs; in addition, the mating surface heat treatment / painting area is reduced, saving manufacturing costs; the pump core is plug-in connected to the spline shaft, which is convenient for quick disassembly and replacement.

[0014] The main shaft 5c and the centrifugal hole 5f of the centrifugal hole type booster pump 5 are designed as an integrated structure with a compact structure. The booster pump is provided with booster centrifugal holes 5a with equal spacing and a certain inclination angle. The rotating centrifugal force is used to increase the pressure at the oil inlet of the main pump, thereby improving the oil suction performance of the main pump; an oil suction window 4b is provided on the isolation plate of the cavity 4 to ensure the concentration of oil suction and improve the oil pumping efficiency.

[0015] The working principle is as follows: the inlet and outlet pipelines are connected to ensure that the system forms a closed-loop hydraulic system. When the motor drives the main shaft to start rotating, the small gear drives the ring gear to rotate in the same direction, the oil inlet starts to absorb oil, and the oil is forced to be thrown to the oil suction chamber of the internal gear pump through the centrifugal booster pump. The negative pressure generated by the meshing of the gear pump is then "sucked" into the inter-tooth cavity in two ways, and then discharged through the oil discharge port; when the actual working condition is at high speed, the internal gear pump will have insufficient oil suction, and the booster pump will replenish the oil to the oil suction chamber of the internal gear pump through the centrifugal hole, increase the inlet pressure, realize sufficient oil supply to the main shaft, and improve its volumetric efficiency.

[0016] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-speed internal gear pump integrated with a centrifugal hole type booster pump, comprising an end cover (1), a first sealing ring (2), an internal gear pump core (3), a cavity (4), a centrifugal hole type booster pump (5), a hole elastic retaining ring (6), a shaft elastic retaining ring (7), a second sealing ring (8), a double-row angular contact ball bearing (9), a rotating shaft lip seal ring (10), and a base (11), characterized in that: The end cover (1) is located at the front end of the pump, and is provided with an oil outlet (1c) at the top. Four threaded holes of the same size are provided around it for flange connection. It is connected to the left end of the cavity (4) by screws and sealed by a first sealing ring (2); the pump core (3) of the internal gear pump is installed on the left side of the centrifugal hole type booster pump (5) and is connected to the centrifugal hole type booster pump (5) by a spline (5a); the top of the cavity (4) is provided with an oil inlet (4e), and threaded holes are provided on the left and right sides to be connected to the end cover (1) and the base (11) respectively; the centrifugal hole type booster pump (5) is integrated in the high-speed internal The gear pump has an oil suction circuit, a main shaft (5c) of a centrifugal hole type booster pump (5) and a centrifugal hole (5f) as an integrated structure, and a flat keyway (5d) is provided on the right end of the shaft for connecting to a motor through a coupling; the double-row angular contact ball bearing (9) is embedded in the base, matched with the main shaft of the centrifugal hole type booster pump (5), and positioned by a retaining ring; the base (11) is located at the rightmost side of the device, and is embedded with a double-row angular contact ball bearing (9) and a rotating shaft lip seal ring (10), connected to the cavity (4) through four evenly distributed screw holes, and sealed by a second seal ring (8).

2. The high-speed internal gear pump integrated with a centrifugal hole type booster pump according to claim 1, characterized in that: In an internal meshing gear pump core (3), a rectangular sealing ring (3a) is located at the front end of a high-pressure side plate (3b) and contacts an end cover (1) during assembly; a pinion (3e) and a gear ring (3f) form an internal meshing gear pair, and the two together with a stator ring (3g) form a pump core body; a high-pressure side plate (3b) and a low-pressure side plate (3h) respectively cover two sides of the pump core, with a crescent plate (3i) placed in the middle, and the entire device is connected by screws (3j).

3. The high-speed internal gear pump integrated with a centrifugal hole type booster pump according to claim 1, characterized in that: In the pump core (3) of the internal meshing gear pump, a crescent plate (3i) is integrated on a low-pressure side plate (3h); the pump core is plug-in connected to a spline shaft.

4. The high-speed internal gear pump integrated with a centrifugal hole type booster pump according to claim 1, characterized in that: The main shaft (5c) and the centrifugal hole (5f) of the centrifugal hole type booster pump (5) are designed as an integrated structure, and booster centrifugal holes with equal spacing and a certain inclination angle are evenly distributed on the disc.

5. The high-speed internal gear pump integrated with a centrifugal bore type booster pump according to claim 1, characterized in that: The cavity (4) is provided with an isolation plate to separate the pump core of the internal gear pump from the centrifugal hole type booster pump (5), and an oil suction window (4b) is provided on the isolation plate.

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