CN113606107B - High power density's electromagnetism directly drives linkage pump of joining in marriage - Google Patents

High power density's electromagnetism directly drives linkage pump of joining in marriage Download PDF

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Publication number
CN113606107B
CN113606107B CN202110769592.3A CN202110769592A CN113606107B CN 113606107 B CN113606107 B CN 113606107B CN 202110769592 A CN202110769592 A CN 202110769592A CN 113606107 B CN113606107 B CN 113606107B
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valve
pump
pump unit
port
oil
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CN113606107A (en
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高仁璟
王赓
黄现国
刘书田
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Dalian University of Technology
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Dalian University of Technology
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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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • 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
    • F04B49/22—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 by means of valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type

Abstract

The invention relates to the technical field of hydraulic pumps, and provides an electromagnetic direct-drive linkage flow distribution pump with high power density, which comprises two linkage flow distribution pump modules with the same structure, wherein each linkage pump module comprises a moving-coil electromagnetic linear actuator, and two valve-pump units with the same structure are symmetrically arranged at two ends of the moving-coil electromagnetic linear actuator; the two linkage flow distribution pump modules are in oil path connection through four valve-pump units which are distributed in a 2 x 2 matrix manner; the oil circuit for connecting the four valve-pump units comprises full linkage connection and half linkage connection. According to the high-power-density electromagnetic direct-drive linkage flow distribution pump, the four valve-pump units are jointly driven by the two pump modules with the same structure to simultaneously distribute flow, so that continuous oil suction and discharge can be realized, and output flow pulsation is reduced; meanwhile, the size, the direction and the frequency of output flow can be conveniently adjusted, and the working efficiency and the flexibility of the direct drive pump are improved.

Description

High power density's electromagnetism directly drives linkage pump of joining in marriage
Technical Field
The invention relates to the technical field of hydraulic pumps, in particular to an electromagnetic direct-drive linkage flow distribution pump with high power density.
Background
The electromagnetic direct drive pump cancels a motion conversion mechanism of rotation-straight line in the middle of the traditional swash plate type plunger pump, shortens a power transmission route, has the advantages of small volume, simple structure, high power density and the like, is convenient for highly integrated design, and can be widely applied to the fields of aerospace hydrostatic actuators, engineering hydraulic machines, walking hydraulic pressure and the like.
At present, most common electromagnetic direct-drive pumps work together with an active valve to ensure the continuity of oil pumping and oil discharging, although the flow of pump oil can be changed by adjusting the reciprocating motion amplitude and the actuation frequency of an oil pumping and discharging plunger, the additional active valve increases the complexity of the structure, and meanwhile, the problems of serious pump flow pulsation, limited regulating capacity for system flow and pressure and the like still exist.
A multi-piezoelectric driven circulation type active flow distribution pump with patent number CN 103133322B proposes an active flow distribution pump driven by a plurality of piezoelectric ceramic drivers, which can effectively degrade flow pulsation and realize continuous oil suction and discharge, but is limited by the micro-stroke of the piezoelectric ceramic drivers, the rated load of the pump is small, and when a high load is running, the piezoelectric ceramic drivers need an ultra-high frequency running condition, which can generate high-temperature irreversible loss and reduce the working efficiency.
Disclosure of Invention
In order to effectively improve the power density of an electromagnetic direct drive pump, improve the robustness of a system and reduce the nonlinear output of unnecessary flow in work, on the basis of fully considering the high-frequency bidirectional driving characteristic of a moving coil type electromagnetic linear actuator and improving the integration level of the electromagnetic direct drive pump, the invention provides a complete machine structure of an electromagnetic direct drive linkage flow distribution pump with high power density. The invention can effectively improve the power transmission efficiency of the whole electromechanical-hydraulic integration, improve the output power of the system, realize the continuous oil suction and discharge of low-flow pulsation, and ensure the working coordination and application of the electromagnetic direct drive pump, and the invention adopts the following technical scheme:
an electromagnetic direct-drive linkage flow distribution pump with high power density comprises two linkage flow distribution pump modules with the same structure; the linkage pump module comprises a moving-coil electromagnetic linear actuator, and two valve-pump units with the same structure are symmetrically arranged at two ends of the moving-coil electromagnetic linear actuator; the two linkage flow distribution pump modules are in oil circuit connection through four valve-pump units, the four valve-pump units are distributed in a 2 x 2 matrix mode, and are sequentially a valve-pump unit A, a valve-pump unit C, a valve-pump unit B and a valve-pump unit D along the anticlockwise direction, wherein the valve-pump unit A and the valve-pump unit C are installed at two ends of the same moving-coil electromagnetic linear actuator, and the valve-pump unit B and the valve-pump unit D are installed at two ends of the other moving-coil electromagnetic linear actuator;
wherein, the moving coil type electromagnetic linear actuator includes: the valve pump comprises an outer yoke 2, a permanent magnet array 4 bonded on the inner surface of the outer yoke 2, two end covers 1 coaxially and fixedly connected with two ends of the permanent magnet array 4 through an inner yoke 3, two valve pump fixing flanges 8 respectively and coaxially and fixedly connected with the outer end parts of the two end covers 1, an electromagnetic coil group 6 is wound in a groove of a coil framework 5, the coil framework 5 is sleeved between the outer surface of the inner yoke 3 and the inner surface of the permanent magnet array 4, two ends of the coil framework 5 are provided with extending teeth 7, the extending teeth 7 at the two ends are respectively arranged in inner cavities of the two valve pump fixing flanges 8 through the grooves of the two end covers 1, and two coil framework connecting plates 9 are respectively and fixedly connected with the coil framework 5 through threaded holes of the extending teeth 7 at the two ends of the coil framework 5; the valve-pump unit comprises a first valve cover 10, a valve body 11, a valve core 12, a second valve cover 13, a cylinder body 14 and a piston 15, wherein the first valve cover 10, the valve body 11, the second valve cover 13 and the cylinder body 14 are sequentially and coaxially fixedly connected to the outer end part of a valve pump fixing flange 8, the valve core 12 penetrates through the valve body 11, two ends of the valve core 12 are respectively and coaxially connected with a coil framework connecting plate 9 and the piston 15 in a threaded manner, the piston 15 is positioned in the cylinder body 14, a valve cavity is formed between the valve core 12 and the valve body 11, and a first valve port A is arranged on the wall of the valve cavityVA second valve port P and a third valve port BVAn oil suction and discharge working cavity is formed between the outer end part of the piston 15 and the cylinder body 14, and an oil suction and discharge port A is arranged on the wall of the oil suction and discharge working cavityP；
The oil circuit for connecting the four valve-pump units comprises full linkage connection and semi-linkage connection; the full linkage connection is an oil suction and discharge port A of the valve-pump unit APA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit BPA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit CPA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPConnected with the second valve port P of the valve-pump unit A, the first valve port A of the valve-pump unit AVFirst valve port A of valve-pump unit BVFirst valve port A of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with the oil port X, and the third valve port B of the valve-pump unit AVThird valve port B of valve-pump unit BVThird port B of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with the oil port Y; the semi-linkage connection is an oil suction and discharge port A of a valve-pump unit APA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit APA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit CPConnected with the second valve port P of the valve-pump unit B and the third valve port B of the valve-pump unit AVFirst valve port A of valve-pump unit BVThird port B of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with an oil port X, and a first valve port A of a valve-pump unit AVThird valve port B of valve-pump unit BVFirst valve port A of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with the oil port Y.
Further, the permanent magnet array 4 is formed by m axially magnetized permanent magnets 4.1 and n radially magnetized permanent magnets 4.2 which are tightly attached to each other, wherein m and n are positive integers, and m is equal to n + 1.
Further, the electromagnetic coil group 6 is composed of a forward coil windings 6.1 and b reverse coil windings 6.2, the winding directions of the coils of the adjacent windings are opposite, wherein a and b are positive integers, and a-b or a-b is ± 1.
Furthermore, the number of windings of the electromagnetic coil group 6 and the number of radial magnetizing permanent magnets 4.2 satisfy n ═ a + b.
Further, a hollow hole is formed in the end part, close to the valve body 11, of the first valve cover 10, and a first linear bearing 17 is installed in the hollow hole; the end part of the second valve cover 13 close to the valve body 11 is provided with a hollow hole, and a second linear bearing 19 is arranged in the hollow hole.
Further, a seal ring a16 and a seal ring b18 are provided between the first linear bearing 17 and the first valve cover 10, and a seal ring c20 and a seal ring e22 are provided between the second linear bearing 19 and the second valve cover 13.
Further, a sealing ring d21 is disposed on the outer surface of the valve core 12, and a sealing ring f23 is disposed on the outer surface of the piston 15.
Compared with the existing active flow distribution servo pump, the invention has the following advantages:
1. the high-power-density electromagnetic direct-drive linkage flow distribution pump adopts the integrated design of the valve-pump units at the two ends, the two valve-pump units with the same structure are symmetrically arranged at the two ends of the moving-coil electromagnetic linear actuator, and the moving-coil electromagnetic linear actuator drives the valve-pump unit at one end to work and simultaneously drives the valve-pump unit at the other end to work, so that the number of driving elements is reduced, and the structural compactness of the pump is improved.
2. The high-power-density electromagnetic direct-drive linkage flow distribution pump adopts two pump modules with the same structure to jointly drive four valve-pump units to simultaneously distribute flow, can realize continuous flow output of the pump, reduce flow pulsation, eliminate flow dead zones and improve the flexibility and output power of the pump.
3. The high-power-density electromagnetic direct-drive linkage flow distribution pump is directly driven by a moving-coil electromagnetic linear actuator based on a permanent magnet array (Halbach permanent magnet array), a rotation-linear motion conversion device is omitted, power transmission efficiency is high, and dynamic response is rapid.
4. The electromagnetic direct-drive linkage flow distribution pump with high power density can provide different parameter indexes aiming at different performance requirements and application targets, ensures the design flexibility of the electromagnetic direct-drive pump, and has wider application range.
Drawings
FIG. 1 is a schematic diagram of the structure and semi-linkage connecting oil circuit of the present invention;
FIG. 2 is a schematic diagram of a single ganged pump module configuration of the present invention;
FIG. 3 is a schematic diagram of the drive principle of a single ganged pump module of the present invention;
FIG. 4 is a schematic diagram of the structure and full linkage connection oil path of the present invention;
FIG. 5 is a schematic view of the displacement of each of the plurality of linkage pump modules for a first flow output condition of the present invention;
FIG. 6 is a schematic view of the flow curves of port X and port Y for the first flow output condition of the present invention;
FIG. 7 is a schematic view of the displacement of each of the plurality of linkage pump modules for a second flow output condition of the present invention;
fig. 8 is a schematic view of the flow curves of port X and port Y for the second flow output condition of the present invention.
In the figure: A-D are four valve-pump units;
1, end cover; 2 an outer yoke; 3 an inner yoke; 4, permanent magnet array; 5, a coil framework; 6, a solenoid coil group; 7 extending out of the teeth; 8, a valve pump fixing flange; 9, connecting a coil framework; 10 a first valve cover; 11 a valve body; 12 a valve core; 13 a second valve cover; 14 cylinder bodies; 15 a piston; 16, a sealing ring a; 17 a first linear bearing; 18 sealing ring b; 19 a second linear bearing; 20 a sealing ring c; 21, a sealing ring d; 22 a sealing ring e; 23, a sealing ring f;
4.1 axially magnetizing the permanent magnet; 4.2 radial magnetizing permanent magnet;
6.1 forward coil winding; 6.2 reversing the coil winding.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an electromagnetic direct-drive linkage flow distribution pump with high power density comprises two linkage flow distribution pump modules with the same structure; the linkage pump module comprises a moving-coil electromagnetic linear actuator, and two valve-pump units with the same structure are symmetrically arranged at two ends of the moving-coil electromagnetic linear actuator; the two linkage flow distribution pump modules are in oil circuit connection through four valve-pump units, the four valve-pump units are distributed in a 2 x 2 matrix mode, and the valve-pump unit A, the valve-pump unit C, the valve-pump unit B and the valve-pump unit D are sequentially arranged along the anticlockwise direction;
wherein, taking the first linkage flow distribution pump module as an example, as shown in fig. 2, the moving coil type electromagnetic linear actuator comprises an outer yoke 2, a permanent magnet array 4 adhered to the inner surface of the outer yoke 2, two end covers 1 coaxially and fixedly connected to the two ends of the permanent magnet array 4 through an inner yoke 3, two valve pump fixing flanges 8 coaxially and fixedly connected to the outer ends of the two end covers 1 respectively, an electromagnetic coil group 6 wound in a groove of a coil frame 5, the coil frame 5 sleeved between the outer surface of the inner yoke 3 and the inner surface of the permanent magnet array 4, two ends of the coil frame 5 provided with extending teeth 7, the extending teeth 7 at the two ends pass through the concave parts of the two end covers 1The grooves are respectively arranged in the inner cavities of the two valve pump fixing flanges 8, and the two coil framework connecting plates 9 are respectively fixedly connected with the coil framework 5 through threaded holes of the extending teeth 7 at the two ends of the coil framework 5; the valve-pump unit comprises a first valve cover 10, a valve body 11, a valve core 12 and a second valve cover 13, the valve comprises a cylinder body 14 and a piston 15, wherein a first valve cover 10, a valve body 11, a second valve cover 13 and the cylinder body 14 are sequentially and coaxially fixedly connected to the outer end part of a valve pump fixing flange 8, a hollow hole is formed in the end part of the first valve cover 10 close to the valve body 11, a first linear bearing 17 is installed in the hollow hole, a sealing ring a16 and a sealing ring b18 are arranged between the first linear bearing 17 and the first valve cover 10, a hollow hole is formed in the end part of the second valve cover 13 close to the valve body 11, a second linear bearing 19 is installed in the hollow hole, a sealing ring c20 and a sealing ring 22e are arranged between the second linear bearing 19 and the second valve cover 13, a valve core 12 penetrates through the valve body 11, a sealing ring d21 is arranged on the outer surface of the valve core 12, two ends of the valve core 12 are coaxially and in threaded connection with a coil framework connecting plate 9 and the piston 15 respectively, a valve cavity is formed between the valve core 12 and the valve body 11, and a first valve port A is arranged on the wall of the valve cavity.VA second valve port P and a third valve port BVThe outer surface of the piston 15 is provided with a sealing ring f23, an oil suction and discharge working cavity is formed between the outer end part of the piston 15 and the cylinder body 14, and an oil suction and discharge port A is arranged on the wall of the oil suction and discharge working cavityP(ii) a The permanent magnet array 4 is formed by mutually clinging m axial magnetized permanent magnets 4.1 and n radial magnetized permanent magnets 4.2, wherein m and n are positive integers, and m is n + 1; the electromagnetic coil group 6 is composed of a forward coil windings 6.1 and b reverse coil windings 6.2, the winding directions of the coils of the adjacent windings are opposite, wherein a and b are positive integers, and a-b or a-b is +/-1; the number of the windings of the electromagnetic coil group 6 and the number of the radial magnetizing permanent magnets 4.2 satisfy n which is a + b.
The working principle of the first linkage flow distribution pump module is as shown in fig. 3, a coil framework 5, an electromagnetic coil group 6, coil framework connecting plates 9 at two ends, valve cores 12 at two ends, pistons 15 at two ends, a sealing ring d21 and a sealing ring f23 form a pump rotor of the first linkage flow distribution pump module together, the current-carrying electromagnetic coil group 6 bears lorentz force in a stable magnetic field provided by the permanent magnet array 4 and acts on the pump rotor to generate axial displacement in a stroke, and driving forces in different directions can be realized by adjusting different current directions through a controllerAnd output, the driving force output with different sizes can be realized by adjusting different current amplitudes through a controller. Fig. 3 (a) shows the pump mover at the negative end of its stroke, where the valve chamber at the left end is simultaneously connected to the first valve port aVIs communicated with the second valve port P, and oil can be discharged from the first valve port AVFlows into the valve chamber at the left end and is discharged from the second valve port P, or the second valve port P flows into the valve chamber at the left end and is discharged from the first valve port AVDischarging; the valve cavity at the right end and the third valve opening B simultaneouslyVIs communicated with the second valve port P, and oil can be discharged from the third valve port BVFlows into the right-hand valve chamber and is discharged from the second port P, or the second port P may flow into the right-hand valve chamber and is discharged from the third port BVDischarging; under the current shown in fig. 3 (a), the pump rotor moves to the right, and the valve chamber at the left end passes through the second valve port P and the first valve port AVThe communication area is gradually reduced, the volume of the oil suction and discharge working cavity is increased, and external oil passes through the oil suction and discharge port APSucking oil into the oil sucking and discharging working cavity; meanwhile, the valve cavity at the right end passes through a second valve port P and a third valve port BVThe communication area is gradually reduced, the volume of the oil suction and discharge working cavity is reduced, and oil in the oil suction and discharge working cavity passes through the oil suction and discharge port APIs pressed out. When the pump mover moves to the stroke middle position, as shown in fig. 3 (b), the valve cavities at the left and right ends are only communicated with the second valve port P; the pump rotor continues to move rightwards under the current shown in (b) of fig. 3, the volume of the oil suction and discharge working chamber at the left end is continuously increased, and external oil passes through the oil suction and discharge port APThe left valve cavity is connected with a second valve port P and a third valve port B through a continuous suction oil discharge working cavityVThe communication area of (a) is gradually increased; meanwhile, the volume of the oil suction and discharge working chamber at the right end is continuously reduced, and oil in the oil suction and discharge working chamber passes through the oil suction and discharge port APIs pressed out, and the valve cavity at the right end passes through the second valve port P and the first valve port AVGradually increases the communication area. When the pump rotor continues to move rightwards to the positive end of the stroke under the current shown in (c) of fig. 3, the volume of the oil suction and discharge working chamber at the left end reaches the maximum, the oil suction work is stopped, and the valve chamber at the left end and the third valve port B simultaneouslyVIs communicated with the second valve port P, and oil can be discharged from the third valve port BVInto the left endThe fluid is discharged from the second port P, or the fluid flows into the left-hand valve chamber from the second port P and flows into the third port BVDischarging; meanwhile, the volume of the oil suction and discharge working cavity at the right end reaches the minimum, the oil discharge is stopped, and the valve cavity at the right end and the first valve port A simultaneouslyVIs communicated with the second valve port P, and oil can be discharged from the first valve port AVFlows into the valve chamber at the right end and is discharged from the second valve port P, or flows into the valve chamber at the right end from the second valve port P and flows from the first valve port AVDischarging; then, the current direction in the electromagnetic coil group 6 is changed through the control signal, the pump rotor generates reverse displacement and moves leftwards, and the valve cavity at the left end passes through the second valve port P and the third valve port BVThe communicating area of the valve cavity and the third valve opening B are gradually reduced, when the pump rotor moves to the stroke middle positionVSeparated from the first valve port A gradually through the second valve port PVThe oil is communicated until the pump rotor reaches the negative end of the stroke, the volume of the oil suction and discharge working cavity is gradually reduced in the process, and oil in the oil suction and discharge working cavity passes through the oil suction and discharge port APIs pressed out; meanwhile, the valve cavity at the right end passes through the second valve port P and the first valve port AVWhen the pump rotor moves to the stroke middle position, the valve cavity and the first valve port A are connectedVSeparated and then gradually separated from the third valve port B through the second valve port PVThe oil is communicated until the pump rotor reaches the negative end of the stroke, the volume of the oil suction and discharge working cavity is gradually increased in the process, and external oil passes through the oil suction and discharge port APIs sucked into the oil suction and discharge working cavity.
The oil paths for connecting the four valve-pump units comprise full linkage connection and half linkage connection, and the full linkage connection and the half linkage connection of the oil paths have the same principle but different pipeline connection modes. The full linkage connection is an oil suction and discharge port A of the valve-pump unit APA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit BPA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit CPA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPConnected with the second valve port P of the valve-pump unit A, the first valve port A of the valve-pump unit AVFirst valve port of valve-pump unit BAVFirst valve port A of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with the oil port X, and the third valve port B of the valve-pump unit AVThird valve port B of valve-pump unit BVThird port B of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with an oil port Y as shown in figure 1; the semi-linkage connection is an oil suction and discharge port A of a valve-pump unit APA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit APA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit BPConnected with the second valve port P of the valve-pump unit C and the third valve port B of the valve-pump unit AVFirst valve port A of valve-pump unit BVThird port B of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with an oil port X, and a first valve port A of a valve-pump unit AVThird valve port B of valve-pump unit BVFirst valve port A of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with the oil port Y as shown in fig. 4.
The working principles of the two linkage flow distribution pump modules are completely the same, the four valve-pump units are jointly driven to simultaneously distribute flow under the control of two paths of sinusoidal displacement signals with the same amplitude and 90-degree phase difference, oil is absorbed from one of the oil port X and the oil port Y, and oil is discharged from the other oil port; the output flow of the high-power-density electromagnetic direct-drive linkage flow distribution pump can be controlled by controlling the amplitudes of the two displacement signals, and the flow output direction of the high-power-density electromagnetic direct-drive linkage flow distribution pump can be controlled by controlling the phase relation of the two displacement signals.
The invention relates to a high-power-density electromagnetic direct-drive linkage flow distribution pump which is a bidirectional pump and comprises two flow output working conditions, wherein the working method of the high-power-density electromagnetic direct-drive linkage flow distribution pump is described in detail by taking full linkage connection of oil ways as an example, and the specific process comprises the following steps:
(1) first flow output condition: oil port X discharges oil and oil port Y sucks oil
According to the principle, the two linkage flow distribution pump modules in the pump jointly drive the four valve-pump units to simultaneously distribute flow, and the displacement of the two linkage flow distribution pump modules is shown in figure 5. For convenience of description, the initial positions of the pump rotors in the two linkage flow distribution pump modules are set to be sequentially 90-degree-different phases, that is, the pump rotor of the first linkage flow distribution pump module is in a stroke middle position, and the pump rotor of the second linkage flow distribution pump module is at a stroke negative end; at the time of 0 to T/4, the pump rotor of the first linkage flow distribution pump module moves from the stroke middle position to the stroke positive end part, the piston 15 of the valve-pump unit A compresses the oil suction and discharge working cavity, and oil passes through the second valve port P of the valve-pump unit B in the second linkage flow distribution pump module and is discharged from the first valve port AVConverging an oil port X, discharging the pump from the oil port X, simultaneously moving a pump rotor of the second linkage flow distribution pump module from a stroke negative end part to a stroke middle position, compressing a suction and discharge oil working cavity by a piston 15 of a valve-pump unit D, and passing oil through a second valve port P of a valve-pump unit A in the first linkage flow distribution pump module from a first valve port AVAn oil inlet X is converged, and the pump is discharged from the oil inlet X; similarly, the oil port Y absorbs oil, and the oil is simultaneously sucked into the oil suction and discharge working cavities of the valve-pump unit C and the valve-pump unit D through the combined driving of the first linkage flow distribution pump module and the second linkage flow distribution pump module; the flow curves of the oil ports X and the oil ports Y of the electromagnetic direct-drive linkage flow distribution pump with high power density in the whole period T are shown in FIG. 6, wherein the positive flow represents oil discharge, and the negative flow represents oil absorption.
(2) Second flow output condition: oil is absorbed by the oil port X and discharged by the oil port Y
According to the principle, the two linkage flow distribution pump modules in the pump jointly drive the four valve-pump units to simultaneously distribute flow, and the displacement of the two linkage flow distribution pump modules is shown in fig. 7. At the time of 0 to T/4, oil is simultaneously discharged from the oil suction and discharge working chambers of the valve-pump unit C and the valve-pump unit D through the combined driving of the first linkage flow distribution pump module and the second linkage flow distribution pump module, the discharged oil is converged into an oil inlet Y, and is discharged out of the pump from the oil inlet Y; similarly, the oil port X absorbs oil, and the oil is simultaneously sucked into the oil suction and discharge working cavities of the valve-pump unit A and the valve-pump unit B through the combined driving of the first linkage flow distribution pump module and the second linkage flow distribution pump module; the flow curves of the oil ports X and the oil ports Y of the electromagnetic direct-drive linkage flow distribution pump with high power density in the whole period T are shown in FIG. 8, wherein the positive flow represents oil discharge, and the negative flow represents oil absorption.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (10)

1. An electromagnetic direct-drive linkage flow distribution pump with high power density comprises two linkage flow distribution pump modules with the same structure; the linkage flow distribution pump module is characterized by comprising a moving-coil electromagnetic linear actuator, wherein two valve-pump units with the same structure are symmetrically arranged at two ends of the moving-coil electromagnetic linear actuator; the two linkage flow distribution pump modules are in oil circuit connection through four valve-pump units, the four valve-pump units are distributed in a 2 x 2 matrix mode, and are sequentially a valve-pump unit A, a valve-pump unit C, a valve-pump unit B and a valve-pump unit D along the anticlockwise direction, wherein the valve-pump unit A and the valve-pump unit C are installed at two ends of the same moving-coil electromagnetic linear actuator, and the valve-pump unit B and the valve-pump unit D are installed at two ends of the other moving-coil electromagnetic linear actuator;
wherein, the moving coil type electromagnetic linear actuator includes: the magnetic valve pump comprises an outer yoke (2), a permanent magnet array (4) bonded on the inner surface of the outer yoke (2), two end covers (1) coaxially connected with the two ends of the permanent magnet array (4) through an inner yoke (3), two valve pump fixing flanges (8) are coaxially connected with the outer end parts of the two end covers (1) respectively, an electromagnetic coil group (6) is wound in a groove of a coil framework (5), the coil framework (5) is sleeved between the outer surface of the inner yoke (3) and the inner surface of the permanent magnet array (4), two ends of the coil framework (5) are provided with extending teeth (7), the extending teeth (7) at the two ends are arranged in inner cavities of the two valve pump fixing flanges (8) respectively through grooves of the two end covers (1), and the two valve pump fixing flanges are arranged in the inner cavities of the two valve pump fixing flanges (8) respectivelyThe coil framework connecting plate (9) is fixedly connected with the coil framework (5) through threaded holes of the teeth (7) extending out of the two ends of the coil framework (5) respectively; the valve-pump unit comprises a first valve cover (10), a valve body (11), a valve core (12), a second valve cover (13), a cylinder body (14) and a piston (15), wherein the first valve cover (10), the valve body (11), the second valve cover (13) and the cylinder body (14) are sequentially and coaxially fixedly connected to the outer end of a valve pump fixing flange (8), the valve core (12) penetrates through the valve body (11), two ends of the valve core (12) are respectively coaxially connected with a wire ring framework connecting plate (9) and the piston (15) in a threaded manner, the piston (15) is positioned in the cylinder body (14), a valve cavity is formed between the valve core (12) and the valve body (11), and a first valve port A is arranged on the wall of the valve cavityVA second valve port P and a third valve port BVAn oil suction and discharge working cavity is formed between the outer end part of the piston (15) and the cylinder body (14), and an oil suction and discharge port A is arranged on the wall of the oil suction and discharge working cavityP；
The oil circuit for connecting the four valve-pump units comprises full linkage connection and semi-linkage connection; the full linkage connection is an oil suction and discharge port A of the valve-pump unit APA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit BPA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit CPA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPConnected with the second valve port P of the valve-pump unit A, the first valve port A of the valve-pump unit AVFirst valve port A of valve-pump unit BVFirst valve port A of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with the oil port X, and the third valve port B of the valve-pump unit AVThird valve port B of valve-pump unit BVThird port B of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with the oil port Y; the semi-linkage connection is an oil suction and discharge port A of a valve-pump unit APA suction/discharge port A of the valve-pump unit D connected with the second valve port P of the valve-pump unit DPA suction and discharge port A of the valve-pump unit C connected with the second valve port P of the valve-pump unit APA suction and discharge port A of the valve-pump unit B connected with the second valve port P of the valve-pump unit BPConnected with the second valve port P of the valve-pump unit C and the third valve port B of the valve-pump unit AVFirst valve port A of valve-pump unit BVThird port B of valve-pump unit CVAnd a first port A of the valve-pump unit DVAre all communicated with an oil port X, and a first valve port A of a valve-pump unit AVThird valve port B of valve-pump unit BVFirst valve port A of valve-pump unit CVAnd a third valve port B of the valve-pump unit DVAre all communicated with the oil port Y.
2. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 1, wherein the permanent magnet array (4) is formed by m axial magnetizing permanent magnets (4.1) and n radial magnetizing permanent magnets (4.2) which are tightly attached to each other, wherein m and n are positive integers, and m is n + 1.
3. The high-power-density electromagnetic direct-drive linkage pump according to claim 1 or 2, wherein the electromagnetic coil group (6) is composed of a forward coil windings (6.1) and b reverse coil windings (6.2), the winding directions of adjacent windings are opposite, wherein a and b are positive integers, and a-b or a-b is ± 1.
4. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 2, wherein the number of windings of the electromagnetic coil group (6) and the number of radial magnetizing permanent magnets (4.2) satisfy n ═ a + b.
5. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 1, 2 or 4, characterized in that a hollow hole is formed in the end part, close to the valve body (11), of the first valve cover (10), and a first linear bearing (17) is installed in the hollow hole; and a hollow hole is formed in the end part, close to the valve body (11), of the second valve cover (13), and a second linear bearing (19) is installed in the hollow hole.
6. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 3, characterized in that a hollow hole is formed in the end part, close to the valve body (11), of the first valve cover (10), and a first linear bearing (17) is installed in the hollow hole; and a hollow hole is formed in the end part, close to the valve body (11), of the second valve cover (13), and a second linear bearing (19) is installed in the hollow hole.
7. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 5, characterized in that a seal ring a (16) and a seal ring b (18) are arranged between the first linear bearing (17) and the first valve cover (10), and a seal ring c (20) and a seal ring e (22) are arranged between the second linear bearing (19) and the second valve cover (13).
8. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 6, characterized in that a seal ring a (16) and a seal ring b (18) are arranged between the first linear bearing (17) and the first valve cover (10), and a seal ring c (20) and a seal ring e (22) are arranged between the second linear bearing (19) and the second valve cover (13).
9. The high-power-density electromagnetic direct-drive linkage pump according to claim 1, 2, 4, 6, 7 or 8, wherein a sealing ring d (21) is arranged on the outer surface of the valve core (12), and a sealing ring f (23) is arranged on the outer surface of the piston (15).
10. The high-power-density electromagnetic direct-drive linkage flow distribution pump according to claim 3, characterized in that a sealing ring d (21) is arranged on the outer surface of the valve core (12), and a sealing ring f (23) is arranged on the outer surface of the piston (15).
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DE3933125A1 (en) * 1989-10-04 1991-04-11 Schienle Manfred Dipl Ing Grad Electromagnetically operated positive displacement pump - has alternately energised coils controlling oscillating armature driving twin pistons with one-way valves for fluid transfer
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CN104533745B (en) * 2014-12-17 2016-10-05 北京航空航天大学 Double butterflies that straight line resonant motor drives work in coordination with flow pump
CN111441928A (en) * 2020-04-26 2020-07-24 山东理工大学 High-power-density moving-coil type electromagnetic direct-drive hydraulic pump

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CN112128095A (en) * 2020-10-13 2020-12-25 中国农业大学 Novel digital flow distribution mechanism based on power coupling acting valve

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