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CN-122014601-A - Gear pump with partial pressure section topology reconstruction

CN122014601ACN 122014601 ACN122014601 ACN 122014601ACN-122014601-A

Abstract

A gear pump with partial pressure topological reconstruction relates to the technical field of positive displacement gear pumps. The novel cycloidal pump is characterized in that a cycloidal pump cavity, a gear pump cavity and a main shaft hole are formed in the pump body, the cycloidal pump cavity is provided with an inlet communicated with the outside, the gear pump cavity is provided with an outlet communicated with the outside, the pump body is further provided with a U-shaped inner runner communicated with the cycloidal pump cavity and the gear pump cavity, a cycloidal pump assembly is arranged in the cycloidal pump cavity, the gear pump assembly is arranged in the gear pump cavity, an overflow runner is further arranged in the pump body, the overflow runner is communicated with the U-shaped inner runner and the inlet, and an overflow valve is arranged on the overflow runner. The gear pump has the advantages of compact structure, stable operation, low noise level, small vibration amplitude, strong self-priming capability, small flow pulsation, high volumetric efficiency, high transmission efficiency and the like, and can ensure the safety and reliability of operation in various fields.

Inventors

  • LI YIBIN
  • LI WENHUI
  • SHI WENJUN
  • ZHANG SHENGFU

Assignees

  • 兰州理工大学

Dates

Publication Date
20260512
Application Date
20260323

Claims (8)

  1. 1. The gear pump with the partial pressure topological reconstruction comprises a pump body (2), a front pump cover (1), a rear pump cover (3) and a main shaft (4), and is characterized in that the pump body (2) is provided with a cycloid pump cavity (21), a gear pump cavity (22) and a main shaft hole (23) which are positioned in front, The cycloid pump cavity (21) is provided with an inlet (201) communicated with the outside, the gear pump cavity (22) is provided with an outlet (202) communicated with the outside, and the pump body (2) is also provided with a U-shaped inner runner (203) communicated with the cycloid pump cavity (21) and the gear pump cavity (22); A cycloidal pump assembly (5) is arranged in the cycloidal pump cavity (21), and a gear pump assembly (6) is arranged in the gear pump cavity (22); an overflow flow passage (71) is further formed in the pump body (2), the overflow flow passage (71) is communicated with the U-shaped inner flow passage (203) and the inlet (21), and an overflow valve (7) is arranged on the overflow flow passage (71).
  2. 2. The gear pump of claim 1, wherein the gerotor pump assembly (5) includes an inlet port plate (51), an outer rotor (52), an inner rotor (53), and an outlet port plate (54), the outer rotor (52) being meshed with the inner rotor (53), the inner rotor (53) being coupled to the main shaft (4).
  3. 3. The gear pump with partial pressure section topology reconstruction according to claim 2, wherein the inlet port plate (51) is provided with an arc-shaped through groove (511), the width of the arc-shaped through groove (511) is gradually reduced, and the inlet port plate (51) is also provided with a side oil port (512) for communicating the widest part of the arc-shaped through groove (511) with the inlet (201).
  4. 4. A gear pump with partial pressure segment topology reconstruction according to claim 3, characterized in that a valve plate positioning pin hole (14) is formed in the inner end surface (11) of the front pump cover (1), a positioning pin (513) is arranged on the inlet valve plate (51), and the inlet valve plate (51) is connected with the valve plate positioning pin hole (14) on the inner end surface (11) of the front pump cover (1) through the positioning pin (513).
  5. 5. The gear pump with partial pressure topological reconstruction according to claim 2, wherein the outlet port plate (54) is provided with an arc-shaped through groove II (541), the width of the arc-shaped through groove II (541) is gradually widened, and the outlet port plate (54) is also provided with a side oil port II (542) for communicating the widest part of the arc-shaped through groove II (541) with the inlet of the U-shaped internal flow channel (203).
  6. 6. The gear pump with partial pressure segment topology reconstruction according to claim 5, characterized in that an outlet port plate positioning pin hole is arranged on the bottom surface of the cycloidal pump cavity (21), another positioning pin is arranged on the outlet port plate (54), and the outlet port plate (52) is connected with the outlet port plate positioning pin hole on the bottom surface of the cycloidal pump cavity (21) through the other positioning pin.
  7. 7. The gear pump with partial pressure topological reconstruction according to claim 1, wherein the rear pump cover (3) is provided with a rear pump cover 8-shaped accommodating cavity (31), an 8-shaped sleeve (63) is arranged in the rear pump cover 8-shaped accommodating cavity (31), the 8-shaped sleeve (63) is provided with an upper shaft hole (631) and a lower shaft hole (632), a bearing I (64) is arranged in the upper shaft hole (631), a bearing II (65) is arranged in the lower shaft hole (632), The gear pump assembly (6) comprises a driving gear (61) and a driven gear (62), the driving gear (61) is connected to the main shaft (4), the middle part of the main shaft (4) is movably connected with the main shaft hole (23), the tail end of the main shaft (4) is movably connected with the first bearing (64), the driven gear (62) is meshed with the driving gear (61), the driven gear (62) is provided with a short shaft, one end of the short shaft is movably connected to the pump body (2), and the other end of the short shaft is connected with the second bearing (65).
  8. 8. A gear pump with partial pressure stage topology reconstruction according to claim 1, characterized in that the cycloidal pump assembly (5) has a working displacement Vc, the gear pump assembly (6) has a working displacement Vg, the spindle (4) has a rotational speed n, the cycloidal pump assembly (5) has a flow Qc = Vc x n, the gear pump assembly (6) has a flow Qg = Vg x n, Qc≥Qg×(1+δ), Where delta is the integrated margin coefficient for manufacturing error, leakage and medium viscosity variation.

Description

Gear pump with partial pressure section topology reconstruction Technical Field The invention relates to the technical field of positive displacement gear pumps, in particular to a gear pump with partial pressure section topology reconstruction. Background Among the conventional gear pumps, external gear pumps and internal gear cycloidal pumps are widely used. The external gear pump generally adopts involute straight gears, involute spiral gears, cycloidal gears, linear conjugate gears, circular arc involute circular arc gears and the like, and designs gear pumps of different types by utilizing the meshing characteristics of corresponding gears to finish the transportation of media, but the external gear pump has the phenomena of low efficiency, strong pulsation, insufficient self-absorption, large vibration, large noise and the like in the operation process. The latter internal meshing cycloidal pump has the comprehensive properties of small volume, high efficiency, small pulsation, strong self-suction and low vibration noise, but has the problems of lower pressure, small flow and misalignment of the shaft. Because the existing equipment is developed in the directions of high power, high efficiency and multiple working conditions, the simple adoption of the cycloidal internal gear pump is insufficient for meeting the requirements of high-end mechanical equipment, new energy automobiles, high-power wind power equipment and the like in aviation industry on pressure, efficiency and the like. It is also difficult to meet the pressure, vibration and noise requirements of high-end equipment operation by simply adopting an external gear pump. In order to achieve pressure elevation and avoid flow pulsation, the applicant has proposed a converging type booster cycloidal pump with a certain effect in the publication No. 202510317207. X. But the working pressure and the flow rate of the device still have a certain gap between the working efficiency of the device in the application occasions of the aviation industry, high-end mechanical equipment, new energy automobiles, high-power wind power and the like. Disclosure of Invention Aiming at the technical problems, the invention provides the gear pump which has a compact structure and can furthest regulate two elements of volume and performance so as to meet the matching of interstage pressure and further realize the topological reconstruction of the pressure division section of serial supercharging. The technical scheme of the invention is that the gear pump with the partial pressure section topology reconstruction comprises a pump body, a front pump cover, a rear pump cover and a main shaft, and is characterized in that a cycloid pump cavity, a gear pump cavity and a main shaft hole are arranged in the front of the pump body, The cycloid pump cavity is provided with an inlet communicated with the outside, the gear pump cavity is provided with an outlet communicated with the outside, and the pump body is also provided with a U-shaped inner runner communicated with the cycloid pump cavity and the gear pump cavity; a cycloidal pump assembly is arranged in the cycloidal pump cavity, and a gear pump assembly is arranged in the gear pump cavity; and an overflow flow passage is further formed in the pump body, the overflow flow passage is communicated with the U-shaped inner flow passage and the inlet, and an overflow valve is arranged on the overflow flow passage. Further, the gerotor assembly includes an inlet port plate, an outer rotor, an inner rotor, and an outlet port plate, the outer rotor meshed with the inner rotor, the inner rotor coupled to the main shaft. Further, the inlet valve plate is provided with an arc-shaped through groove I, the width of the arc-shaped through groove I is gradually reduced, and the inlet valve plate is also provided with a side oil port I which is used for communicating the widest part of the arc-shaped through groove I with the inlet. Further, a positioning pin hole of the valve plate is formed in the inner end face of the front pump cover, a positioning pin is arranged on the inlet valve plate, and the inlet valve plate is connected with the positioning pin hole of the valve plate on the inner end face of the front pump cover through the positioning pin. Further, the outlet port plate is provided with an arc-shaped through groove II, the width of the arc-shaped through groove II is gradually widened, and the outlet port plate is also provided with a side oil port II which is used for communicating the widest part of the arc-shaped through groove II with the inlet of the U-shaped inner flow channel. Further, an outlet valve plate positioning pin hole is formed in the bottom surface of the cycloid pump cavity, another positioning pin is arranged on the outlet valve plate, and the outlet valve plate is connected with the outlet valve plate positioning pin hole in the bottom surface of the cycloid pump cavity through the other positioning