CN-121976935-A - Low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation

CN121976935ACN 121976935 ACN121976935 ACN 121976935ACN-121976935-A

Abstract

The application relates to the technical field of hydraulic power elements, in particular to a low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation, which comprises a shared driving shaft, a pump shell and two odd plunger groups which are coaxially connected in series and have the same plunger number. The two pump assemblies are preset with a specific phase angle on the circumferential phase, so that the second pump assembly lags the first pump assembly by one quarter of the working cycle of the plunger. A rigid confluence flow passage communicated with oil discharge ports of the two pumps is integrated in the pump shell so as to transmit pressure waves in a fidelity manner. The two valve plates are provided with phase cooperative damping grooves, wherein the second damping groove is asymmetrically corrected to realize accurate peak shifting and oil discharge. The application can utilize the synergistic effect of stator reference physical phase dislocation, rigid flow channel transmission and asymmetric damping groove compensation to radically counteract flow pulsation and inhibit confluence impact, obviously reduce fluid excitation noise and promote system operation stability.

Inventors

ZHOU KAIYAN
LI YISHUN
FU XINRONG
HE PENG
LIN TIANLIANG
HUANG TENGCHAO
Yao Zhaoyuan
MIAO CHENG
FU SHENGJIE
LIU JIEXIN
GUO TONG

Assignees

华侨大学

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (8)

1. A low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation comprises a shared driving shaft, a pump shell, a first pump component and a second pump component which are coaxially connected in series and synchronously driven by the shared driving shaft, wherein the first pump component comprises a first swash plate supporting seat, a first valve plate, a first cylinder body and a first plunger group which are positioned between the first swash plate supporting seat and the first valve plate, the second pump component comprises a second swash plate supporting seat, a second valve plate, a second cylinder body and a second plunger group which are positioned between the second swash plate supporting seat and the second valve plate, the first plunger group and the second plunger group are the same odd number, The second pump assembly is offset in phase relative to the first pump assembly by a phase angle alpha, the phase angle meets the formula alpha = pi/(2Z), Z is the number of the first plunger group or the second plunger group, so that when the common driving shaft synchronously drives the first pump assembly and the second pump assembly to rotate, the highest physical displacement point and the flow distribution switching phase of the second pump assembly synchronously deflect relative to the first pump assembly and lag behind the plunger working period of the first pump assembly; The rigid confluence flow passage is integrated in the pump housing, and is communicated with oil drain ports of the first pump assembly and the second pump assembly in the pump housing so as to transmit dynamic superposition pressure waves to a fluid confluence point in a fidelity manner by utilizing an internal oil passage; The high-pressure transition areas of the first valve plate and the second valve plate are respectively provided with a first phase cooperative damping groove and a second phase cooperative damping groove, the pre-compression angle of the second phase cooperative damping groove is asymmetrically corrected based on dynamic overlapped pressure waveforms in the rigid confluence flow channel, and the pre-compression angle is configured to enable a plunger cavity of the second pump assembly to avoid pulsation peaks output by oil discharge of the first pump assembly when oil discharge is started.
2. The stator bias and damping synergy-based low-pulsation integrated duplex axial plunger pump of claim 1, wherein the first swash plate support seat and the first valve plate of the first pump assembly are respectively arranged in the pump shell through a first swash plate support seat positioning pin group and a first valve plate positioning pin group, and the first swash plate support seat positioning pin group and the first valve plate positioning pin group are kept consistent in circumferential phase to serve as reference phases of the whole duplex pump; The second valve plate and the second swash plate support seat of the second pump assembly are respectively arranged in the pump shell through a second valve plate positioning pin group and a second swash plate support seat positioning pin group, wherein the projection phases of the second valve plate positioning pin group and the second swash plate support seat positioning pin group on the pump shell are offset by the phase included angle alpha in the circumferential direction relative to the reference phase.
3. The stator bias and damping synergy based low pulsation integrated duplex axial plunger pump of claim 1, wherein the pump housing comprises a common intermediate body between the first pump component and the second pump component, and the first valve plate and the second valve plate are respectively fitted and installed on two opposite side end surfaces of the common intermediate body.
4. The stator bias and damping synergy-based low pulsation integrated duplex axial plunger pump of claim 3, wherein the rigid converging flow passage is integrally arranged inside the common intermediate body, and high-pressure oil discharged by the first pump assembly and the second pump assembly meet and join at an acute angle inside the common intermediate body.
5. The stator bias and damping synergy based low pulsation integrated duplex axial plunger pump of claim 4, wherein the rigid converging flow passage is in a U-shaped or V-shaped structure.
6. The stator bias and damping synergy-based low-pulsation integrated duplex axial plunger pump is characterized in that second phase cooperative damping grooves of the second valve plate and first phase cooperative damping grooves of the first valve plate are arranged asymmetrically on the circumferential throttling length or the overflowing cross-sectional area, and pre-compression angles or pressure release angles of the second phase cooperative damping grooves are compensated through the asymmetric arrangement so as to offset microsecond sound velocity time difference when high-pressure oil liquid is transmitted in the rigid confluence flow channel, and accurate destructive interference of dynamic pressure waveforms is achieved.
7. The stator bias and damping synergy-based low pulsation integrated duplex axial plunger pump of claim 1, wherein a front valve plate anti-misloading locating pin is arranged on the back surface of the first valve plate, a rear valve plate anti-misloading locating pin is arranged on the back surface of the second valve plate, and the pin diameters and the lengths of the front valve plate anti-misloading locating pin and the rear valve plate anti-misloading locating pin are mutually incompatible so as to physically limit the interchangeability of the first valve plate and the second valve plate in the assembly process through mutually incompatible anti-misloading structures.
8. The stator bias and damping synergy based low pulsation integrated dual axial plunger pump of claim 1, wherein the number of first and second plunger sets is 9 to lag the second pump assembly by 1/4 plunger duty cycle.

Description

Low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation Technical Field The invention relates to the technical field of hydraulic power elements, in particular to a low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation. Background The axial plunger pump is widely applied to hydraulic transmission systems of high-end equipment such as engineering machinery, aerospace, heavy-duty metallurgical equipment and the like due to the advantages of high power density, high working pressure, flexible variable control and the like. In complex conditions such as excavators, loaders, etc. where large flows of multi-circuit independent or cross oil supply is required, coaxial duplex axial plunger pumps driven in series by the same drive shaft are generally adopted. However, since the plunger pump realizes oil suction and discharge by means of the reciprocating motion of the plunger in the cylinder, there is inevitably periodic pulsation in the output flow rate and pressure thereof. For the most widely used odd plunger pumps (e.g., 9 plunger pumps), the fundamental frequency of the single pump output flow pulsations is typically high and the pulsation amplitude is relatively small. However, in the coaxial duplex pump structure, when the oil discharge pipelines of the two pumps are converged outside or work in parallel, if the rotor phases of the two pumps are completely synchronous, and the plunger motion phases between the parallel pumps are not designed, the pulsation waveforms of the two pumps are overlapped in phase, so that the total flow pulsation amplitude after the convergence is amplified in multiple, and further strong fluid excitation noise, fatigue rupture of the pipelines and misoperation of the control valve group are caused. Disclosure of Invention The application aims to provide a low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation, which solves the problems of pulsation superposition, large fluid excitation noise, oil backflow and cavitation caused by confluence impact and the like in confluence of the conventional coaxial duplex odd plunger pump. The invention adopts the following scheme: The low-pulsation integrated duplex axial plunger pump based on stator bias and damping cooperation comprises a common driving shaft, a pump housing, a first pump assembly and a second pump assembly which are coaxially connected in series and synchronously driven by the common driving shaft, wherein the first pump assembly comprises a first swash plate supporting seat, a first valve plate, a first cylinder body and a first plunger group which are positioned between the first swash plate supporting seat and the first valve plate, and the second pump assembly comprises a second swash plate supporting seat, a second valve plate, a second cylinder body and a second plunger group which are positioned between the second swash plate supporting seat and the second valve plate; The second pump assembly is offset in phase relative to the first pump assembly by a phase angle alpha, the phase angle meets the formula alpha = pi/(2Z), Z is the number of the first plunger group or the second plunger group, so that when the common driving shaft synchronously drives the first pump assembly and the second pump assembly to rotate, the highest physical displacement point and the flow distribution switching phase of the second pump assembly synchronously deflect relative to the first pump assembly and lag behind the plunger working period of the first pump assembly; The rigid confluence flow passage is integrated in the pump housing, and is communicated with oil drain ports of the first pump assembly and the second pump assembly in the pump housing so as to transmit dynamic superposition pressure waves to a fluid confluence point in a fidelity manner by utilizing an internal oil passage; The high-pressure transition areas of the first valve plate and the second valve plate are respectively provided with a first phase cooperative damping groove and a second phase cooperative damping groove, the pre-compression angle of the second phase cooperative damping groove is asymmetrically corrected based on dynamic overlapped pressure waveforms in the rigid confluence flow channel, and the pre-compression angle is configured to enable a plunger cavity of the second pump assembly to avoid pulsation peaks output by oil discharge of the first pump assembly when oil discharge is started. Further, the first swash plate support seat and the first valve plate of the first pump assembly are respectively arranged in the pump shell through the first swash plate support seat positioning pin group and the first valve plate positioning pin group, the first swash plate support seat positioning pin group and the first valve plate positioning pin group are kept consistent in circumferential phase to serve as reference phases of the whole duple