Linear oscillation motor pump based on magnetic structure and linear reciprocating motion method thereof

Abstract

The invention discloses a linear oscillation motor pump based on a magnetic structure and a linear reciprocating motion method thereof, wherein the linear oscillation motor pump comprises a housing, a stator, a mover and a one-way valve; the mover comprises a shaft core, a piston rod, a permanent magnet 1 and a permanent magnet 2; the stator comprises an enameled coil winding, a fixing ring, a coil fixing frame and a magnetic yoke. The invention realizes the guiding effect on the magnetic field by cooperating with a permanent magnet 1 and a permanent magnet 2 which are arc-shaped sheets and have the same structure but different magnetization directions, so that the magnetic field in the linear motor can be transmitted between the permanent magnet 1 and the permanent magnet 2, and each permanent magnet 1 and the two permanent magnets 2 adjacent to each other in the axial direction form a closed magnetic circuit, replacing the Halbach magnetic ring structure, but can also realize the function of reducing magnetic field loss and improving magnetic induction intensity, and the processing difficulty of the permanent magnet 1 and the permanent magnet 2 is greatly reduced, thereby greatly saving the processing cost.

Description

Technical Field

[0001] The present invention belongs to the field of electromagnetic technology, and in particular relates to a linear oscillation motor pump based on a magnetic structure and a linear reciprocating motion method thereof. Background Art

[0002] Traditional linear reciprocating motion is achieved primarily through a motor-driven crank-connecting rod mechanism, converting rotational motion into linear reciprocating motion. However, this method generates significant friction losses, low transmission efficiency, poor mechanical reliability, and produces significant noise. Therefore, with technological advancements, linear motors have become the preferred method for achieving linear motion. Existing linear motors, which abandon the traditional crank-connecting rod mechanism, are motors that directly convert electrical energy into magnetic energy, and then magnetic energy into mechanical energy, enabling linear motion. Their basic principles are similar to those of traditional rotary motors, consisting of a stator and a mover. Their structure is simple, and linear reciprocating motion is achieved between the stator and mover through magnetic energy, without involving excessive mechanical transmission. Therefore, their internal force environment is simpler, and lateral forces and friction are significantly reduced compared to traditional structures.

[0003] With the development of the petroleum industry, the requirements for linear motor pumps are becoming increasingly stringent. Linear motor pumps are also developing towards high output pressure, high flow, easy manufacturing and maintenance, small size, and light weight. As the core of the entire hydraulic system, the linear motor pump's stator and mover layout design, as well as the winding design, directly affect the thrust and efficiency of the linear motor pump. The arrangement of the magnets on the mover and the magnetic field generated by the magnets both affect the mover's linear reciprocating motion. The material of the mover's shaft core also affects the magnetic field. Therefore, reducing the influence of the shaft core material on the magnetic field is an effective way to improve the efficiency of linear motor pumps. Currently, the arrangement of magnets on the mover often uses a Halbach magnetic ring structure. This structure effectively guides the magnetic field, preventing the magnetic field from passing through the shaft core and maintaining a high magnetic strength. However, magnets based on the Halbach magnetic ring structure are expensive, costly to produce, and difficult to obtain, significantly increasing the production cost of linear motor pumps. Therefore, to address the shortcomings of current linear motor pumps, there is an urgent need to develop a linear motor pump that can improve magnetic utilization efficiency, has a reliable structure, and is highly efficient. Summary of the Invention

[0004] To solve the above problems, the present invention proposes a linear oscillation motor pump based on a magnetic structure and a linear reciprocating motion method thereof. By combining permanent magnet one and permanent magnet two, the Halbach magnetic ring structure is replaced, but the functions of reducing magnetic field loss and increasing magnetic induction intensity are still achieved, thereby improving the working efficiency of the linear motor.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The present invention is based on a linear oscillation motor pump with a magnetic structure, comprising a DC motor and a one-way valve; the DC motor comprises a housing, a stator and a mover; the two ends of the housing are respectively fixed to the two piston cavities; the stator and the mover are both placed in the housing; the mover comprises an axis core, a piston rod, a permanent magnet 1 and a permanent magnet 2; the two ends of the axis core are respectively fixedly connected to the two piston rods; the two piston rods are coaxially arranged, and each piston rod forms a sliding pair with the housing; each piston rod extends into a corresponding piston cavity; the permanent magnet 1 and the permanent magnet 2 are both arc-shaped. The permanent magnets are in the form of sheets and are all fixed to the shaft core; one end of the permanent magnet one facing the center of the circle is an S pole and the other end is an N pole; one end of the permanent magnet two facing the center of the circle is an N pole and the other end is an S pole; n permanent magnets one are equidistantly arranged along the circumference of the shaft core to form a permanent magnet ring group one, where n ≥ 3; n permanent magnets two are equidistantly arranged along the circumference of the shaft core to form a permanent magnet ring group two; m+1 permanent magnet ring groups one and m permanent magnet ring groups two are equidistantly arranged along the axial direction of the shaft core, where m ≥ 2; a permanent magnet ring group two is arranged between every two adjacent permanent magnet ring groups one.

[0007] The stator includes an enameled coil winding, a fixing ring, a coil fixing frame and a yoke; a yoke is provided between each permanent magnet ring group 1 and the shell, and a yoke is provided between each permanent magnet ring group 2 and the shell; the yoke is generally annular and fixedly connected to the inner wall surface of the shell; every two adjacent yokes enclose a coil mounting groove; a fixing ring is fixed in each coil mounting groove; an integrally formed coil fixing frame is provided on the fixing ring; an enameled coil winding is fixed to each coil fixing frame; each enameled coil winding is connected to a power supply, and the current directions of adjacent enameled coil windings are opposite.

[0008] The one-way valve comprises a valve body, a valve core, a spring 1, and a retaining ring; the retaining ring is fixedly connected to the inner wall of the valve body; the valve core forms a sliding pair with the valve body and is connected to the retaining ring via spring 1. The two piston chambers at either end of the housing are connected to one of the ports of two tee joints; the other two ports of each tee joint are connected to one end of two straight-through joints; of the two straight-through joints located at the same end of the housing, the other end of one straight-through joint is connected to the valve body input port of one one-way valve, and the other end of the other straight-through joint is connected to the valve body output port of the other one-way valve.

[0009] Preferably, the housing is formed by fixing two opposite parts.

[0010] Preferably, a guide copper sleeve is fixed to both ends of the housing, and the two guide copper sleeves and the two piston rods respectively form a sliding pair.

[0011] More preferably, each guide copper sleeve is connected to one end of a spring 2; each spring 2 is sleeved on a piston rod, and the other end of each spring 2 is fixed to a corresponding piston rod.

[0012] Preferably, a spacer ring is provided between each adjacent permanent magnet ring group 1 and permanent magnet ring group 2, and both the permanent magnet ring group 1 and the permanent magnet ring group 2 are fixed to the shaft core through the spacer ring.

[0013] More preferably, a spacer block is provided between each adjacent two permanent magnets 1 in the same permanent magnet ring group 1 and between each adjacent two permanent magnets 2 in the same permanent magnet ring group 2.

[0014] More preferably, the spacer block is made of non-magnetic material.

[0015] The linear reciprocating motion method of the linear oscillating motor pump based on the magnetic structure of the present invention is as follows:

[0016] Start each power supply to supply power to each enameled coil winding, and the currents flowing into adjacent enameled coil windings are in opposite directions, causing each enameled coil winding to generate electromagnetic induction, so that each permanent magnet 1 and the two axially adjacent permanent magnets 2 form a closed magnetic circuit, and under the action of like poles repelling each other and opposite poles attracting each other, the magnetic force generated by each enameled coil winding drives the mover composed of each permanent magnet 1, each permanent magnet 2, the shaft core and the piston rod to slide toward one end of the shell; when the current direction of the power supply to each enameled coil winding is changed, the magnetic poles generated by each enameled coil winding change, causing the mover to slide toward the other end of the shell; when the current direction in each enameled coil winding changes periodically, the mover can periodically perform linear reciprocating motion in the shell; during the periodic linear reciprocating motion of the mover, a one-way valve at the end indicated by the mover's motion direction discharges gas or liquid under the action of pressure difference, and a one-way valve at the other end inhales gas or liquid under the action of pressure difference, and the other two one-way valves are in an inactivated state.

[0017] Preferably, multiple linear oscillation motor pumps based on magnetic structures operate in parallel, and the one-way valves facing outward at the output ports of each linear oscillation motor pump based on magnetic structures are connected to the driven hydraulic components, and the one-way valves facing inward at the output ports of each linear oscillation motor pump based on magnetic structures are connected to the medium storage box.

[0018] The present invention has the following beneficial effects:

[0019] 1. The present invention achieves a guiding effect on the magnetic field by combining permanent magnets 1 and 2, which are identical in structure but differ only in magnetization direction, so that the magnetic field within the linear motor can be transferred between permanent magnets 1 and 2. Each permanent magnet 1 forms a closed magnetic circuit with two axially adjacent permanent magnets 2, replacing the Halbach ring structure while still achieving the same function of reducing magnetic field loss and increasing magnetic induction intensity, thereby improving the operating efficiency of the linear motor. Furthermore, the arcuate shape of permanent magnets 1 and 2, as well as the different magnetization polarities of the inner and outer arc portions, significantly reduces the processing difficulty compared to the Halbach ring structure, thereby significantly saving processing costs.

[0020] 2. The yoke of the present invention is in annular shape as a whole, and only one enameled coil winding is required to be installed in the coil installation groove enclosed by two adjacent yokes, so that the stator structure of the present invention is simple and easy to process.

[0021] 3. The present invention can adopt multi-stage parallel operation, which can improve work efficiency and fault resistance, meet the industrial demand for large flow and high pressure hydraulic systems, and has better applicability in industrial production.

[0022] 4. The shaft core of the present invention can be made of lightweight, high-strength, non-magnetic conductive material, which not only greatly reduces the mass of the mover, but also avoids magnetic loss caused by the magnetic field passing through the shaft core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of the AA section;

[0025] Figure 3 Schematic diagram of the permanent magnet 1 and the spacer blocks arranged circumferentially in the present invention;

[0026] Figure 4 It is a schematic diagram of the multi-stage joint operation of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] The present invention is based on a linear oscillating motor pump with a magnetic structure, such as Figure 1 、 Figure 2 and Figure 3As shown, it includes a DC motor and a one-way valve; the DC motor includes a housing 10, a stator and a mover; the two ends of the housing 10 are respectively fixed to the two piston chambers 7; the stator and the mover are both placed in the housing 10; the mover includes a shaft core 13, a piston rod 8, a permanent magnet 1 22 and a permanent magnet 2 23; the two ends of the shaft core 13 are respectively fixedly connected to the two piston rods 8; the two piston rods 8 are coaxially arranged, and each piston rod 8 forms a sliding pair with the housing 10; each piston rod 8 extends into a corresponding piston chamber 7; the permanent magnet 1 22 and the permanent magnet 2 23 are both arc-shaped sheets and are fixed to the shaft core 13; the end of the permanent magnet 1 22 facing the center of the circle is the S pole ( Figure 1 The other end is N pole ( Figure 1 The black part is filled in the middle), one end of the permanent magnet 23 facing the center of the circle is the N pole, and the other end is the S pole; n permanent magnets 1 22 are equidistantly arranged along the circumference of the shaft core 13 to form a permanent magnet ring group 1, n ≥ 3; n permanent magnets 23 are equidistantly arranged along the circumference of the shaft core 13 to form a permanent magnet ring group 2; m+1 permanent magnet ring groups 1 and m permanent magnet ring groups 2 are equidistantly arranged along the axial direction of the shaft core 13, m ≥ 2; a permanent magnet ring group 2 is arranged between every two adjacent permanent magnet ring groups 1; the magnetic lines of force of adjacent permanent magnets 1 22 and permanent magnets 2 23 that are aligned in the circumferential direction form a closed magnetic circuit.

[0029] The stator includes an enameled coil winding 15, a retaining ring 17, a coil holder 16, and a yoke 14. A yoke 14 is positioned between each permanent magnet ring group 1 and the housing 10, and a yoke 14 is positioned between each permanent magnet ring group 2 and the housing 10. The yoke 14 is generally annular and fixedly connected to the inner wall of the housing 10. Two adjacent yokes 14 define a coil mounting slot. A retaining ring 17 is fixed within each coil mounting slot. An integrally formed coil holder 16 is mounted on the retaining ring 17. Each coil holder 16 is secured to an enameled coil winding 15. Each enameled coil winding 15 is connected to a power source, with the current flowing in opposite directions between adjacent enameled coil windings 15. The power source can be connected to a controller via a relay and controlled by the controller.

[0030] like Figure 1 As shown, the one-way valve includes a valve body 3, a valve core 4, a spring 5, and a retaining ring 2; the retaining ring 2 is fixedly connected to the inner wall of the valve body 3; the valve core 4 forms a sliding pair with the valve body 3 and is connected to the retaining ring 2 via the spring 5. The two piston chambers 7 at both ends of the housing 10 are respectively connected to one of the ports of the two tee joints 1; the other two ports of each tee joint 1 are respectively connected to one end of two straight-through joints 6; of the two straight-through joints 6 located at the same end of the housing 10, the other end of one straight-through joint 6 is connected to the valve body input port of one one-way valve, and the other end of the other straight-through joint 6 is connected to the valve body output port of the other one-way valve.

[0031] As a preferred embodiment, the housing 10 is composed of two opposite parts connected by a bolt 11 and a nut 12; the detachable structure of the housing 10 facilitates the installation and replacement of the mover and the stator.

[0032] As a preferred embodiment, the housing 10 and the piston chamber 7 are fixedly connected by bolts 9.

[0033] As a preferred embodiment, a guide copper sleeve 21 is fixed to both ends of the housing 10 , and the two guide copper sleeves 21 and the two piston rods 8 respectively form sliding pairs.

[0034] As a more preferred embodiment, each guide copper sleeve 21 is connected to one end of a spring 20; each spring 20 is sleeved on a piston rod 8, and the other end of each spring 20 is fixed to a corresponding piston rod 8; when the shaft core 13 makes a linear reciprocating motion in the housing 10, the spring 20 can reduce the collision between the shaft core 13 and the housing 10, and store elastic potential energy, thereby improving the linear reciprocating motion efficiency of the shaft core 13.

[0035] As a preferred embodiment, the shaft core 13 is connected to each piston rod 8 via a plurality of bolts 19 .

[0036] As a preferred embodiment, a spacer ring 18 (made of non-magnetic material) is provided between each adjacent permanent magnet ring group one and permanent magnet ring group two, and both permanent magnet ring group one and permanent magnet ring group two are fixed to the shaft core 13 through the spacer ring 18; the spacer ring 18 serves to separate and fix the permanent magnet ring group one and permanent magnet ring group two.

[0037] As a more preferred embodiment, Figure 3 As shown, a spacer block 24 is provided between each adjacent two permanent magnets 1 22 in the same permanent magnet ring group 1 and between each adjacent two permanent magnets 2 23 in the same permanent magnet ring group 2; the spacer block 24 serves to equally separate the two adjacent permanent magnets 1 22 or the two adjacent permanent magnets 2 23 on the shaft core 13.

[0038] As a more preferred embodiment, the spacer block 24 is made of a non-magnetic material, which can align the circumferential positions of the adjacent pairs of permanent magnets 1 22 and 23 to form local closed-loop magnetic flux lines without interfering with each other.

[0039] In the case where all of the above embodiments are present, the linear reciprocating motion method of the linear oscillating motor pump based on the magnetic structure of the present invention is specifically as follows:

[0040] Start each power supply to supply power to each enameled coil winding 15. The currents flowing through adjacent enameled coil windings 15 are in opposite directions, so that each enameled coil winding 15 generates electromagnetic induction, so that each permanent magnet 1 22 and the two axially adjacent permanent magnets 2 23 form a closed magnetic circuit. Figure 2As shown, and under the action of like poles repelling each other and unlike poles attracting each other, the magnetic force generated by each enameled coil winding 15 drives the mover composed of each permanent magnet 1 22, each permanent magnet 23, the shaft core 13 and the piston rod 8 to slide toward one end of the housing 10; when the direction of the current supplied by the power supply to each enameled coil winding 15 is changed, the magnetic poles generated by each enameled coil winding 15 change, causing the mover to slide toward the other end of the housing 10; when the direction of the current in each enameled coil winding 15 changes periodically, the mover can periodically perform a linear reciprocating motion in the housing 10; during the periodic linear reciprocating motion of the mover, a one-way valve at the end indicated by the direction of movement of the mover discharges gas or liquid under the action of the pressure difference, and a one-way valve at the other end inhales gas or liquid under the action of the pressure difference, and the other two one-way valves are in an inactive state; as shown Figure 1 As shown, when the mover moves to the right, the external gas or liquid pushes open the valve core 4 in the one-way valve located on the upper left, enters the straight-through joint 6 connected to the one-way valve, and then enters the three-way joint 1 on the left, while the valve core 4 in the one-way valve located on the lower right is pushed open to discharge the gas or liquid; when the mover moves to the left, the external gas or liquid pushes open the valve core 4 in the one-way valve located on the upper right, enters the straight-through joint 6 connected to the one-way valve, and then enters the three-way joint 1 on the right, while the valve core 4 in the one-way valve located on the lower left is pushed open to discharge the gas or liquid; when the two one-way valves with output ports facing outward at both ends of the shell 10 are connected to the driven hydraulic parts, and the other two one-way valves are connected to the medium storage tank (when the medium is air, the two one-way valves are not connected), the linear oscillation motor pump based on a magnetic structure of the present invention can realize the movement of the driven hydraulic parts.

[0041] As a preferred embodiment, Figure 4 As shown, multiple linear oscillation motor pumps based on magnetic structures operate in parallel, and the one-way valves with the output ports facing outwards of each linear oscillation motor pump based on magnetic structures are connected to the driven hydraulic parts, and the one-way valves with the output ports facing inwards of each linear oscillation motor pump based on magnetic structures are connected to the medium storage box; parallel operation can improve the working efficiency of the linear oscillation motor pumps, improve their anti-fault capabilities, and meet the industrial demand for large-flow, high-pressure hydraulic systems.

Claims

1. A linear oscillation motor pump based on a magnetic structure, comprising a DC motor and a one-way valve; the DC motor comprises a housing, a stator and a mover; the two ends of the housing are respectively fixed to the two piston chambers; the stator and the mover are both placed in the housing; the characteristics are: The mover comprises an axis core, a piston rod, a permanent magnet 1 and a permanent magnet 2; the two ends of the axis core are fixedly connected to the two piston rods respectively; the two piston rods are coaxially arranged, and each piston rod forms a sliding pair with the shell; each piston rod extends into a corresponding piston cavity; the permanent magnet 1 and the permanent magnet 2 are both arc-shaped sheets and are fixed to the axis core; the end of the permanent magnet 1 facing the center of the circle is the S pole, and the other end is the N pole, and the end of the permanent magnet 2 facing the center of the circle is the N pole, and the other end is the S pole; n permanent magnets 1 are equidistantly arranged along the circumference of the axis core to form a permanent magnet ring group 1, n≥3; n permanent magnets 2 are equidistantly arranged along the circumference of the axis core to form a permanent magnet ring group 2; m+1 permanent magnet ring groups 1 and m permanent magnet ring groups 2 are equidistantly arranged along the axial direction of the axis core, m≥2; a permanent magnet ring group 2 is arranged between every two adjacent permanent magnet ring groups 1; The stator comprises an enameled coil winding, a fixing ring, a coil fixing frame and a yoke; a yoke is provided between each permanent magnet ring group 1 and the shell, and a yoke is provided between each permanent magnet ring group 2 and the shell; the yoke is in a circular ring shape as a whole and is fixedly connected to the inner wall surface of the shell; each adjacent two yokes enclose a coil mounting groove; a fixing ring is fixed in each coil mounting groove; an integrally formed coil fixing frame is provided on the fixing ring; an enameled coil winding is fixed on each coil fixing frame; each enameled coil winding is connected to a power supply, and the current directions of the adjacent two enameled coil windings are opposite; The one-way valve comprises a valve body, a valve core, a spring and a retaining ring; the retaining ring is fixedly connected to the inner wall surface of the valve body; the valve core and the valve body form a sliding pair and are connected to the retaining ring through a spring; the two piston chambers at both ends of the shell are respectively connected to one of the interfaces of the two three-way joints; the other two interfaces of each three-way joint are respectively connected to one end of the two straight-through joints; of the two straight-through joints located at the same end of the shell, the other end of one of the straight-through joints is connected to the valve body input port of one one-way valve, and the other end of the other straight-through joint is connected to the valve body output port of the other one-way valve.

2. The linear oscillation motor pump based on a magnetic structure according to claim 1, characterized in that: The shell is formed by fixing two opposite parts.

3. The linear oscillation motor pump based on a magnetic structure according to claim 1, characterized in that: A guide copper sleeve is fixed on both ends of the shell, and the two guide copper sleeves and the two piston rods respectively form a sliding pair.

4. The linear oscillation motor pump based on a magnetic structure according to claim 3, characterized in that: Each guide copper sleeve is connected to one end of a spring 2; each spring 2 is sleeved on a piston rod, and the other end of each spring 2 is fixed to a corresponding piston rod.

5. The linear oscillation motor pump based on a magnetic structure according to any one of claims 1 to 4, characterized in that: A spacer ring is provided between each adjacent permanent magnet ring group 1 and permanent magnet ring group 2, and the permanent magnet ring group 1 and the permanent magnet ring group 2 are fixed to the shaft core through the spacer ring.

6. The linear oscillation motor pump based on a magnetic structure according to claim 5, characterized in that: A spacer block is arranged between each adjacent two permanent magnets 1 in the same permanent magnet ring group 1 and between each adjacent two permanent magnets 2 in the same permanent magnet ring group 2.

7. The linear oscillation motor pump based on a magnetic structure according to claim 6, characterized in that: The spacer block is made of non-magnetic material.

8. The linear reciprocating motion method of a linear oscillating motor pump based on a magnetic structure according to claim 7, characterized in that: The method is as follows: Start each power supply to supply power to each enameled coil winding, and the currents passed through adjacent enameled coil windings are in opposite directions, so that each enameled coil winding generates electromagnetic induction, so that each permanent magnet 1 and the two permanent magnets 2 adjacent to each other in the axial direction form a closed magnetic circuit, and under the action of like poles repelling each other and opposite poles attracting each other, the magnetic force generated by each enameled coil winding drives the mover composed of each permanent magnet 1, each permanent magnet 2, the shaft core and the piston rod to slide toward one end of the shell; when the current direction supplied by the power supply to each enameled coil winding is changed, the magnetic poles generated by each enameled coil winding are changed, so that the mover slides to the other end of the shell; when the current direction in each enameled coil winding changes periodically, the mover can periodically perform linear reciprocating motion in the shell; during the periodic linear reciprocating motion of the mover, a one-way valve at the end indicated by the moving direction of the mover discharges gas or liquid under the action of pressure difference, and a one-way valve at the other end inhales gas or liquid under the action of pressure difference, and the other two one-way valves are in an unactivated state.

9. The linear reciprocating motion method of a linear oscillating motor pump based on a magnetic structure according to claim 8, characterized in that: Multiple linear oscillation motor pumps based on magnetic structures operate in parallel, and the one-way valves facing outward at the output ports of each linear oscillation motor pump based on magnetic structures are connected to the driven hydraulic components, and the one-way valves facing inward at the output ports of each linear oscillation motor pump based on magnetic structures are connected to the medium storage box.

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