CN109469594B - Continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for aircraft hydraulic system - Google Patents
Continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for aircraft hydraulic system Download PDFInfo
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- CN109469594B CN109469594B CN201811322899.3A CN201811322899A CN109469594B CN 109469594 B CN109469594 B CN 109469594B CN 201811322899 A CN201811322899 A CN 201811322899A CN 109469594 B CN109469594 B CN 109469594B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
- F04B1/24—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined to the main shaft axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for an aircraft hydraulic system, which comprises: proportion electromagnet: the electromagnetic suction is provided and acts with the hydraulic pressure of the pressure regulating mechanism together to realize the continuous change of the opening degree of the valve port of the regulating mechanism; two-position three-way electromagnetic directional valve: the switching between two states of two-stage voltage regulation and continuous voltage regulation is realized; the pressure regulating mechanism: the hydraulic oil pump moves under the combined action of spring force, hydraulic pressure and electromagnet suction, and communicates a follow-up piston pressure cavity to be connected with return oil or a high-pressure oil cavity; all the variable head are arranged in the variable head, the mounting position of the variable head is fixed through a bottom plug, the variable head is fixed with the plunger pump through a bolt, and an oil way of the variable head is connected with an oil way related to the pump. The continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump realizes continuous regulation from the lowest working pressure to the highest working pressure, and keeps a double-stage pressure regulating function, thereby ensuring the safe operation of the system.
Description
Technical Field
The invention relates to the field of hydraulic control equipment, in particular to a continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for an aircraft hydraulic system.
Background
The hydraulic actuating system of the airplane develops towards high pressure and high power, and the existing hydraulic system of the airplane generally requires an axial plunger pump to work in a constant pressure variable mode to realize constant pressure source oil supply. Because in the whole flight section, load pressure changes greatly, the traditional constant pressure variable pump with fixed pressure has the problems of large throttling loss, difficult heat dissipation and the like, and the main expression form of the throttling loss is that a large amount of heat is generated, so that the temperature of an airborne hydraulic system is increased sharply, and the normal work of the airborne hydraulic system is influenced.
For the existing onboard hydraulic system, the working efficiency of an actuating mechanism is relatively higher than that of a system pump source, most of power loss is generated by the pump source or is closely related to the working form of the pump source, so that some countries develop pressure-variable onboard hydraulic systems and provide two onboard hydraulic systems of a bivariate variable pump and an intelligent pump.
The double-stage pressure variable pump adopts a double-stage variable pump, and when high pressure is required, a pump source works in a high-pressure variable state; and the other is operated in a low-pressure variable state. This will partially reduce the reactive power loss associated with increased system pressure. In the case where the required pressure value falls between high and low pressures, the required pressure is still adjusted close to the high pressure, which, like the aforementioned onboard hydraulic pump, results in a large power loss and thus in a large amount of heat generation. The core of the intelligent pump source system is a variable pump controlled by a microprocessor, the intelligent pump source system can realize multiple functions, and forms an intelligent system in the form of an upper computer and a lower computer with an airplane master control computer system, so that four working modes of flow, pressure, power and integration are realized, and the intelligent pump source system is the most ideal pump source system at present. However, such a pump source system has a high cost requirement and has not been put into practical use.
Disclosure of Invention
The invention aims to solve the problem that a constant pressure variable mode of an existing airborne hydraulic system generates large power loss, and provides an electro-hydraulic proportional variable pump with the pump outlet pressure continuously adjustable between the lowest working pressure and the highest working pressure on the basis of a two-stage pressure variable pump.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system, comprising: the variable head and the plunger pump are fixed together through a bolt, and an oil circuit on the variable head is connected with an oil circuit of the plunger pump; the axial plunger pump comprises a pump shell, a maximum displacement limiting mechanism, a driving shaft, a plunger, a cylinder body, a valve plate and a swash plate, wherein the maximum displacement limiting mechanism, the driving shaft, the plunger, the cylinder body, the valve plate and the swash plate are assembled in the pump shell;
the proportional electromagnet is placed in a variable head hole, an internal thread is processed in the variable head hole, and the position of the proportional electromagnet is fixed by a plug; the electric signal is converted into a force signal as an electric-mechanical conversion element, the output force of the force signal is compared with the hydraulic pressure of an adjusting mechanism, the size of a throttling port of a valve core is controlled, the flow entering a variable cylinder is adjusted, the inclination angle of a swash plate is adjusted, and therefore the output pressure of the variable pump is adjusted;
the two-position three-way electromagnetic reversing valve is arranged in a hole processed by the variable head, an internal thread is processed at the bottom of the hole, the position of the two-position three-way electromagnetic reversing valve is fixed by a plug, and an oil port of the two-position three-way electromagnetic reversing valve is respectively connected with an oil outlet of the variable pump, a spring base oil cavity of the pressure regulating mechanism and a variable pump regulating cavity through an oil pipeline in the variable head; when the two-position three-way electromagnetic directional valve electromagnet is powered off, the variable pump works in a low-pressure state, and both the two-stage pressure and the continuous pressure regulation are invalid;
the pressure regulating mechanism comprises a pressure regulating spring, a spring base, a limiting mechanism and a regulating valve core, the regulating valve core is connected with a proportional electromagnet push rod, and the proportional electromagnet converts a current signal obtained by the proportional amplifying plate into output force; the pressure regulating mechanism is arranged in the variable head, an internal thread is processed at the bottom of the pressure regulating mechanism, the pretightening force of the pressure regulating spring is regulated through a plug, the pressure regulating spring moves under the combined action of spring force, output force of the proportional electromagnet and hydraulic force, and a pressure cavity of the follow-up piston is communicated and connected with return oil or communicated and connected with a high-pressure oil cavity, so that the inclination angle of the swash plate of the oil pump is increased or reduced, and the output flow of the electro-hydraulic proportional axial plunger variable pump is increased; the pressure regulating mechanism determines the outlet pressure of the electro-hydraulic proportional axial plunger variable pump, the low-pressure value of the pressure regulating mechanism is set by regulating the pretightening force of the pressure regulating spring, and the high-pressure value is set by the pressure regulating spring and the hydraulic pressure of the system together; in the pressure regulating mechanism mounting hole, a boss is processed for limiting the stroke of a spring seat of the pressure regulating mechanism and preventing the spring from being excessively compressed and losing efficacy, so that the two-stage compression of the spring is realized.
Furthermore, nine plungers in the plunger pump are uniformly arranged in a cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump and are connected with the driving shaft through splines, the valve plate is fixed on the cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump, the cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump is driven to rotate along with external input torque, and the plungers linearly reciprocate under the limiting action of the return mechanism, so that the pressure output of the oil pump is realized; when the plunger moves in the direction away from the cylinder body, oil is sucked from the oil suction port through the valve plate, and when the plunger moves in the direction towards the cylinder body, high-pressure oil is conveyed to the hydraulic pipeline from the oil outlet through the valve plate.
Furthermore, the electromagnet of the two-position three-way electromagnetic directional valve is electrified, so that the two-position three-way electromagnetic directional valve works in a two-stage pressure regulating state, and then the proportional electromagnet is electrified to generate thrust corresponding to the magnitude of current, so that the sum of the thrust of the electromagnet and the force of the outlet pressure of the oil pump acting on the valve core is equal to the acting force of the spring, and therefore the outlet pressure of the oil pump changes along with the change of the voltage applied to the proportional electromagnet.
Further, because the outlet pressure of the oil pump is equal to the spring force minus the thrust of the electromagnet, the pressure of the oil pump is gradually reduced along with the increase of the thrust of the proportional valve, namely the input voltage; the oil pump outlet pressure is continuously varied between a maximum output pressure and a minimum output pressure.
Furthermore, under the condition that the proportional electromagnet fails to output continuously-changed suction, the outlet pressure of the continuously-adjusted electro-hydraulic proportional axial plunger variable pump acts on the pressure adjusting mechanism, and the pressure adjusting mechanism is compared with the spring force, so that two-stage compression of the spring can be realized through switching of the two-position three-way electromagnetic valve, two-stage change of the pressure is realized, and two-stage adjustment can be realized along with the outlet pressure of the continuously-adjusted electro-hydraulic proportional axial plunger variable pump.
Furthermore, when the electromagnet of the two-position three-way electromagnetic directional valve is powered off, the system works in the lowest pressure working state, and the two-stage pressure regulating function can be realized by powering on.
The invention provides a continuous pressure regulating proportional variable pump aiming at the problem of a large amount of power loss generated by a constant pressure variable mode of an airborne hydraulic system, which is suitable for the load pressure requirement and can effectively reduce the problems of power loss and heating, and the implementation mode is as follows:
the continuous pressure regulating electro-hydraulic proportional variable pump is essentially characterized in that an electro-hydraulic proportional technology is introduced on the basis of a two-stage pressure regulating variable pump, a variable head proportional electromagnet mounting hole is processed, and a proportional electromagnet push rod is connected with a regulating mechanism valve core; under the condition that the two-position three-way electromagnetic directional valve is electrified and the proportional electromagnet is not electrified, output oil of the pump is introduced into an oil cavity of a spring base of the adjusting mechanism, the spring base is pushed to be compressed until the spring base touches the limiting mechanism, and therefore two-stage compression of the spring is achieved, the pressure of an oil outlet of the variable pump is increased, and two-stage adjustment of the pressure is achieved;
under the condition that the two-position three-way electromagnetic directional valve is electrified, the output force, the spring force and the hydraulic pressure of the proportional electromagnet simultaneously act on the valve core of the adjusting mechanism, and the acting force direction of the proportional electromagnet and the hydraulic pressure on the valve core of the adjusting mechanism is the same, so that the output force is increased along with the increase of the input current of the proportional electromagnet, and the output pressure of the variable displacement pump is reduced.
When the proportion electromagnet electrified current is not zero, the valve core stress of the adjusting mechanism is expressed as
Neglecting the description of the damping term and the inertia term, the valve core displacement x can be obtained0In proportion to the output force F of the electromagnet0Under the condition of increasing, the flow entering the adjusting cylinder is increased, the inclined angle of the push swash plate is reduced, and the pressure is reduced.
Under the condition that the proportional electromagnet suddenly fails, the two-stage pressure regulating mode can be recovered, namely the two-stage pressure regulating function of the original pump is not damaged.
Has the advantages that: the continuous pressure regulation electro-hydraulic proportional axial plunger variable pump outlet pressure can realize continuous regulation between the highest working pressure and the lowest working pressure of the two-stage pressure regulating pump, and the two-stage pressure regulating function is kept under the condition that the proportional electromagnet fails, so that the normal operation of the system is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a continuous pressure-regulating proportional variable pump according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the operation of a continuously variable pressure proportional variable pump in accordance with an embodiment of the present invention.
Fig. 3 is a schematic diagram of the operation of a comparative embodiment of the present invention.
In the figure, 1-two-position three-way electromagnetic directional valve, 2-regulating mechanism, 3-pressure regulating spring, 4-axial plunger pump 5-regulating cavity 6-proportion electromagnet, 7-oil suction port, 8-oil outlet, 9-axial plunger variable pump outlet, 10-variable head, 11-maximum displacement limiting mechanism, 12-driving shaft, 13-plunger, 14-cylinder, 15-valve plate, 16-swash plate, 17-proportion pressure reducing valve, 18-two-position two-way electromagnetic directional valve, 19-regulating valve core, 20-additional regulating valve core, 21-push rod and 22-return spring.
Detailed Description
The invention provides a continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system, which is shown in a schematic diagram of fig. 1 and a structural diagram of fig. 2.
A continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for an aircraft hydraulic system comprises an axial plunger pump 4 and a variable head 10, wherein the variable head 10 and the axial plunger pump 4 are fixed together through bolts, and an oil path on the variable head 10 is connected with an oil path of the axial plunger pump 4; the axial plunger pump 4 comprises a pump shell, a maximum displacement limiting mechanism 11, a driving shaft 12, a plunger 13, a cylinder block 14, a valve plate 15 and a swash plate 16, wherein the maximum displacement limiting mechanism is assembled in the pump shell, and the axial plunger pump comprises:
the variable head 10 comprises a two-position three-way electromagnetic directional valve 1, a proportional electromagnet 6 arranged below the same side of the two-position three-way electromagnetic directional valve 1 and an adjusting mechanism 2 which is positioned at the same horizontal position of the proportional electromagnet 6 and is communicated with the proportional electromagnet, and is provided with an internal processing oil path; the pressure regulating mechanism 2 comprises a pressure regulating spring 3, a spring base, a limiting mechanism and a regulating valve core, wherein a boss is processed in a mounting hole of the pressure regulating mechanism and used for mechanical limiting of the spring base and preventing the spring from being excessively compressed and failed, so that two-stage compression of the spring is realized, the regulating valve core is connected with a proportional electromagnet push rod, and a proportional electromagnet 6 converts a current signal obtained by a proportional amplifying plate into an output force; plugs are arranged at the bottoms of the two-position three-way electromagnetic directional valve 1 and the proportional electromagnet 6 to limit the positions of the two-position three-way electromagnetic directional valve and the proportional electromagnet; the oil port of the two-position three-way electromagnetic directional valve 1 is respectively connected with the oil cavity of the spring base of the pressure regulating mechanism 2, the oil outlet 8 of the axial plunger pump 4 and the adjusting cavity 5 of the axial plunger pump 4 through an oil pipeline in the variable head 10; the proportional electromagnet 6 converts the obtained electric signal into a force signal, the output force of the force signal is compared with the hydraulic pressure of the adjusting mechanism 2, the size of a valve core throttling opening is controlled, the flow entering the axial plunger pump 4 is adjusted, the inclination angle of the swash plate 16 is adjusted, and therefore the output pressure of the outlet 9 of the axial plunger variable pump is adjusted; the pressure regulating mechanism 2 regulates the pretightening force of the pressure regulating spring 3 through a plug, moves under the combined action of spring force, output force of the proportional electromagnet 6 and hydraulic pressure, and communicates a pressure cavity of a follow-up piston with return oil or communicates the follow-up piston with a high-pressure oil cavity, so that the inclination angle of an oil pump swash plate 16 is increased or decreased, and the output flow of the electro-hydraulic proportional axial plunger variable displacement pump is increased or decreased; the pressure regulating mechanism 2 determines the pressure of an outlet 9 of the electro-hydraulic proportional axial plunger variable pump, the low-pressure value of the pressure regulating mechanism 2 is set by adjusting the pretightening force of the pressure regulating spring 3, and the high-pressure value is set by the pressure regulating spring 3 and the hydraulic pressure of the system together. The invention uses the axial plunger pump 4, the proportional electromagnet 6, the two-position three-way electromagnetic directional valve 1 and the adjusting mechanism 2 to form a control system to accurately control the output flow of the oil pump in proportion. The working principle is as follows: when the two-position three-way electromagnetic directional valve 1 is powered on, the valve core of the two-position three-way electromagnetic directional valve is pushed to move, the oil outlet 8 is connected with the oil cavity of the spring base of the pressure regulating mechanism 2, the spring is continuously compressed until the spring reaches the limiting device, the two-stage pressure regulation of the variable pump is realized, on the basis, the proportional electromagnet 6 is powered on, the pressure continuous regulation is realized, when the two-position three-way electromagnetic directional valve 1 is powered off, the variable pump works in a low-pressure state, and both the two-stage pressure.
In the embodiment, under the working condition of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump, an aircraft engine is connected with a driving shaft 12 of the variable pump through a gear box to drive a cylinder body 14 in splined connection with the driving shaft 12 to rotate together; nine plungers 13 are uniformly installed in the cylinder 14 at the same angle, and are driven by the return mechanism to make reciprocating linear motion in the cylinder 14, when the plungers 13 move in the direction away from the cylinder 14, oil is sucked from the oil suction port 7 through the valve plate 15, and the plungers 13 move in the direction of the cylinder 14, and high-pressure oil is conveyed to the hydraulic pipeline from the oil outlet 8 through the valve plate 15.
When the two-position three-way electromagnetic directional valve 1 is electrified and the proportional electromagnet 6 is not electrified, the output oil of the variable pump is introduced into the oil cavity of the spring base of the adjusting mechanism 2, and the spring base is pushed to be compressed until the spring base touches the limiting mechanism, so that two-stage compression of the spring is realized, the pressure of the oil outlet 8 of the variable pump is increased, and two-stage pressure adjustment is realized; under the condition that the two-position three-way electromagnetic directional valve 1 is electrified and the proportional electromagnet 6 is also electrified, the output force, the spring force and the hydraulic pressure of the proportional electromagnet 6 simultaneously act on the valve core of the adjusting mechanism 2, and the acting force directions of the proportional electromagnet 6 and the hydraulic pressure on the valve core of the adjusting mechanism 2 are the same, so that the output force is increased along with the increase of the input current of the proportional electromagnet 6, and the output pressure of the variable displacement pump is reduced.
The regulating mechanism spool force is expressed as:
neglecting the description of the damping term and the inertia term, the valve core displacement x can be obtained0In proportion to the output force F of the electromagnet0Under the condition of increasing, the flow entering the adjusting cylinder is increased, the inclined angle of the push swash plate is reduced, and the displacement of the pressure variable pump is reduced.
The equation for the change in control chamber pressure is:
the change of the displacement of the valve core causes the flow Q entering the adjusting cylinderCThus causing the regulated chamber pressure PCAnd (4) changing.
The moment balance equation of the swash plate of the variable displacement pump is as follows:
wherein, I swash plate rotational inertia, C swash plate rotational viscous damping coefficient, FCControlling the force of the cylinder on the swash plate, FnForce-regulated pressure variation P of the plunger acting on the swash plateCCause a change FCThereby, the inclination angle of the swash plate can be changed.
Variable pump output pressure equation:
wherein: qp＝Gpα (5)
Therefore, the change of the output flow caused by the change of the inclination angle of the swash plate can be obtained, and the output pressure is further influenced.
From the above derivation process, when the output force of the proportional electromagnet 6 changes with the input current, the displacement of the valve core of the adjusting mechanism 2 can be changed, the flow entering the pressure regulating cavity is changed, the pressure change is caused, the inclination angle of the variable pump swash plate 16 is further changed, and the output flow and the output pressure change accordingly. Therefore, the input current and the output pressure of the flow pump have a conversion relation, and continuous pressure change is feasible by changing the magnitude of the continuously changing current.
Comparative embodiment: the variable mechanism of the variable pump also comprises a proportional pressure reducing valve 17, a two-position two-way electromagnetic directional valve 18, a regulating valve core 19, an additional regulating valve core 20, a push rod 21 and a return spring 22. As shown in fig. 3, T-shaped grooves are formed in the push rod 21 and the additional adjustment valve element 20, so that the push rod 21 and the additional adjustment valve element 20 are connected, and the problem of unstable force transmission is solved. When the two-position two-way electromagnetic directional valve 18 is not electrified, the double-stage pressure regulating function can be realized; when the two-position two-way electromagnetic directional valve 18 is electrified, the proportional pressure reducing valve 17 is electrified to generate a valve port opening corresponding to the current, so that the outlet pressure of the proportional pressure reducing valve 17 is determined, and the force acting on the end surface of the valve core 20 is also determined. The valve core of the pressure regulating mechanism 2 is acted by the pressure of the pump outlet 9 to externally regulate the force of the valve core 20, the acting force of the push rod 21 and the force of the pressure regulating spring 3 to realize force balance. The valve core spring force is set, the acting force of the push rod 21 changes along with the change of the input current of the proportional reducing valve 17, so that the pressure of the pump outlet 9 can change along with the change of the acting force, and the pressure of the pump outlet 9 can be continuously adjusted between the highest working pressure and the lowest working pressure of the double-variable pump.
The implementation mode has a complex mechanical structure, two oil paths need to be formed to realize continuous pressure regulation and double-stage pressure regulation functions, the design and the processing of the variable head oil path are complex, and meanwhile, the T-shaped groove is difficult to process on the variable head oil path because the valve core of the regulating valve is small.
Compared with the prior art, the implementation mode of the invention has simpler mechanical structure, less required elements and lower cost; the variable head oil path is simple in design, the processing is easy to realize, and the proportional electromagnet push rod does not need to be further processed.
Claims (6)
1. A continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system, comprising: the variable head and the plunger pump are fixed together through a bolt, and an oil circuit on the variable head is connected with an oil circuit of the plunger pump; the method is characterized in that: the axial plunger pump comprises a pump shell, a maximum displacement limiting mechanism, a driving shaft, a plunger, a cylinder body, a valve plate and a swash plate, wherein the maximum displacement limiting mechanism, the driving shaft, the plunger, the cylinder body, the valve plate and the swash plate are assembled in the pump shell;
the proportional electromagnet is placed in a variable head hole, an internal thread is processed in the variable head hole, and the position of the proportional electromagnet is fixed by a plug; the electric signal is converted into a force signal as an electric-mechanical conversion element, the output force of the force signal is compared with the hydraulic pressure of an adjusting mechanism, the size of a throttling port of a valve core is controlled, the flow entering a variable cylinder is adjusted, the inclination angle of a swash plate is adjusted, and therefore the output pressure of the variable pump is adjusted;
the two-position three-way electromagnetic reversing valve is arranged in a hole processed by the variable head, an internal thread is processed at the bottom of the hole, the position of the two-position three-way electromagnetic reversing valve is fixed by a plug, and an oil port of the two-position three-way electromagnetic reversing valve is respectively connected with an oil outlet of the variable pump, a spring base oil cavity of the pressure regulating mechanism and a variable pump regulating cavity through an oil pipeline in the variable head; when the two-position three-way electromagnetic directional valve electromagnet is powered off, the variable pump works in a low-pressure state, and both the two-stage pressure and the continuous pressure regulation are invalid;
the pressure regulating mechanism comprises a pressure regulating spring, a spring base, a limiting mechanism and a regulating valve core, the regulating valve core is connected with a proportional electromagnet push rod, and the proportional electromagnet converts a current signal obtained by the proportional amplifying plate into output force; the pressure regulating mechanism is arranged in the variable head, an internal thread is processed at the bottom of the pressure regulating mechanism, the pretightening force of the pressure regulating spring is regulated through a plug, the pressure regulating spring moves under the combined action of spring force, output force of the proportional electromagnet and hydraulic force, and a pressure cavity of the follow-up piston is communicated and connected with return oil or communicated and connected with a high-pressure oil cavity, so that the inclination angle of the swash plate of the oil pump is increased or reduced, and the output flow of the electro-hydraulic proportional axial plunger variable pump is increased; the pressure regulating mechanism determines the outlet pressure of the electro-hydraulic proportional axial plunger variable pump, the low-pressure value of the pressure regulating mechanism is set by regulating the pretightening force of the pressure regulating spring, and the high-pressure value is set by the pressure regulating spring and the hydraulic pressure of the system together; in the pressure regulating mechanism mounting hole, a boss is processed for limiting the stroke of a spring seat of the pressure regulating mechanism and preventing the spring from being excessively compressed and losing efficacy, so that the two-stage compression of the spring is realized.
2. The continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system of claim 1, wherein: in the plunger pump, nine plungers are uniformly arranged in a cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump and are connected with a driving shaft through splines, a valve plate is fixed on the cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump and drives the cylinder body of the continuous pressure regulating electro-hydraulic proportional axial plunger variable pump to rotate along with external input torque, and the plungers linearly reciprocate under the limiting action of a return mechanism, so that the pressure output of the oil pump is realized; when the plunger moves in the direction away from the cylinder body, oil is sucked from the oil suction port through the valve plate, and when the plunger moves in the direction towards the cylinder body, high-pressure oil is conveyed to the hydraulic pipeline from the oil outlet through the valve plate.
3. The continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system of claim 1, wherein: the electromagnet of the two-position three-way electromagnetic directional valve is electrified, so that the two-position three-way electromagnetic directional valve works in a two-stage pressure regulating state, the proportional electromagnet is electrified to generate thrust corresponding to the magnitude of current, the sum of the thrust of the electromagnet and the force of the outlet pressure of the oil pump acting on the valve core is equal to the acting force of the spring, and therefore the outlet pressure of the oil pump changes along with the change of the voltage of the proportional electromagnet.
4. A continuously pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system as claimed in claim 3, wherein: because the outlet pressure of the oil pump is equal to the spring force minus the thrust of the electromagnet, the pressure of the oil pump is gradually reduced along with the increase of the thrust of the proportional valve, namely the input voltage; the oil pump outlet pressure is continuously varied between a maximum output pressure and a minimum output pressure.
5. The continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system of claim 1, wherein: under the condition that the proportional electromagnet fails to output continuously-changed suction, the outlet pressure of the continuously-regulated electro-hydraulic proportional axial plunger variable pump acts on the pressure regulating mechanism, and the pressure regulating mechanism is compared with the spring force, so that two-stage compression of the spring can be realized through switching of the two-position three-way electromagnetic valve, two-stage change of the pressure is realized, and two-stage regulation can be realized along with the outlet pressure of the continuously-regulated electro-hydraulic proportional axial plunger variable pump.
6. The continuous pressure regulating electro-hydraulic proportional axial plunger variable displacement pump for an aircraft hydraulic system of claim 1, wherein: when the electromagnet of the two-position three-way electromagnetic directional valve is powered off, the system works in the lowest pressure working state, and the two-stage pressure regulating function can be realized by powering on.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019215885A1 (en) * | 2019-10-16 | 2021-04-22 | Robert Bosch Gmbh | Adjustment device and hydraulic machine |
| CN110848111B (en) * | 2019-11-27 | 2021-09-10 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
| CN113503235B (en) * | 2021-06-07 | 2023-07-25 | 中航力源液压股份有限公司 | Variable adjusting mechanism for hydraulic pump |
| CN113446280B (en) * | 2021-06-30 | 2024-06-25 | 北京航空航天大学宁波创新研究院 | Bidirectional differential pressure controller and hydraulic equipment |
| CN113530783B (en) * | 2021-07-19 | 2023-06-02 | 中航力源液压股份有限公司 | Two-stage pressure control device with unloading function |
| CN115095572B (en) * | 2022-07-21 | 2024-05-28 | 湖南十开科技有限公司 | Double-acting electro-hydraulic proportional push rod and electro-hydraulic proportional multi-way valve |
| CN116044732B (en) * | 2022-12-26 | 2024-06-11 | 厦门大学 | Three-stage pressure control system and method |
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| CN109469594A (en) | 2019-03-15 |
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