A magnetically driven low pulse plunger pump

Abstract

The utility model relates to a kind of low pulse plunger pump of magnetic drive.It solves the technical problems such as the inevitable wear of existing plunger pump in long-term operation,unable to directly drive linear reciprocating plunger etc..Including the pump body with working chamber, the magnetic plunger that can be axially separated into first chamber and second chamber by working chamber is movably arranged in pump body, electromagnetic drive assembly that can make magnetic plunger reciprocate along pump body axial direction is arranged in the circumferential outside of pump body, the first one-way valve assembly that is connected with first chamber is arranged in one end of pump body, the second one-way valve assembly that is connected with second chamber is arranged in the other end of pump body.Advantages are that: through the design of double-chamber and electromagnetic drive assembly, the superposition and smooth of flow are realized, output pulsation is significantly reduced, and the drainage phase of two chambers is staggered half cycle, their output flow waveform is superimposed and fills the trough, so that total output flow is very smooth and continuous.

Description

Technical Field

[0001] This utility model belongs to the technical field of plunger pump equipment, specifically relating to a magnetically driven low-pulse plunger pump. Background Technology

[0002] As a core device for high-pressure fluid transportation, plunger pumps are widely used in industrial hydraulics, precision chemicals, medical instruments, and other fields. Traditional mechanically driven plunger pumps have inherent defects. The mechanical seal between the plunger rod and the pump body will inevitably wear down during long-term operation, leading to fluid leakage and contamination of high-purity fluids. If hazardous media are used, it will also pose a serious safety hazard. Current technology also uses magnetically coupled pumps, which use an external rotating magnetic drive to replace the mechanical seal. However, this is only suitable for continuous rotational motion and cannot directly drive linear reciprocating plungers. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a magnetically driven low-pulse plunger pump.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a magnetically driven low-pulse plunger pump, comprising a pump body with a working chamber, wherein a magnetic plunger is axially movable within the pump body, capable of axially dividing the working chamber into a first chamber and a second chamber; an electromagnetic drive assembly is provided on the circumferential outer side of the pump body, enabling the magnetic plunger to reciprocate along the pump body's axial direction; a first one-way valve assembly connected to the first chamber is provided at one end of the pump body, and a second one-way valve assembly connected to the second chamber is provided at the other end of the pump body. Utilizing non-contact drive, the electromagnetic drive assembly is completely isolated from the magnetic plunger, with no mechanical connection, resulting in extremely high reliability, long lifespan, low noise, and no need for lubrication. Simultaneously, the one-way valves ensure unidirectional fluid flow, allowing the dual-chamber structure to work collaboratively, achieving continuous suction and discharge processes. The symmetrical arrangement of the one-way valve assemblies at both ends ensures that the pressure effects of the fluid inlet and outlet on the pump body cancel each other out, improving the pump's stress state.

[0005] In the aforementioned magnetically driven low-pulse plunger pump, the first check valve assembly includes a first check valve disposed at one end of the pump body, the first check valve having a first check valve inlet located on one side of the pump body and a first check valve outlet located on the other side of the pump body.

[0006] In the aforementioned magnetically driven low-pulse plunger pump, the second check valve assembly includes a second check valve disposed at the end of the pump body away from the first check valve. The second check valve has a second check valve inlet located on one side of the pump body and a second check valve outlet located on the other side of the pump body.

[0007] In the aforementioned magnetically driven low-pulse plunger pump, the magnetic plunger incorporates a permanent magnet assembly composed of an axially magnetized annular neodymium iron boron magnet array, with the magnetization direction of the permanent magnet assembly parallel to the plunger's axis of motion. This design provides extremely strong magnetic force, enabling sufficient driving force even with a small plunger volume, thereby achieving pump miniaturization and high power density—a key feature for linear drive.

[0008] In the aforementioned magnetically driven low-pulse plunger pump, the electromagnetic drive assembly is circumferentially arranged around the outside of the pump body and extends from one end of the pump body to the other. The coil covers the entire plunger stroke, meaning that the plunger can be effectively driven by electromagnetic force at any position along its movement path, avoiding dead point problems and ensuring the continuity and controllability of the movement. At the same time, the circumferential arrangement can generate a relatively uniform axial magnetic field, which is beneficial to the smooth movement of the plunger.

[0009] In the aforementioned magnetically driven low-pulse plunger pump, the electromagnetic drive assembly includes at least two independently controlled solenoid coils, with the two solenoid coils receiving drive currents with a 180° phase difference. By coordinating the control of the currents in the two coils, greater thrust can be provided when the magnetic plunger needs acceleration, and braking force or reverse pull can be provided when deceleration or reversal is required, achieving precise motion control and high dynamic response.

[0010] In the aforementioned magnetically driven low-pulse plunger pump, the length of the electromagnetic drive assembly is less than the length of the pump body. This is a clever safety design; the movement range of the magnetic plunger is physically limited to the area covered by the coil. Even if the control system malfunctions, the magnetic plunger will not impact the end cap of the pump body, preventing damage to the mechanical structure.

[0011] In the aforementioned magnetically driven low-pulse plunger pump, the solenoid coil, located on the outside of the pump body, has 2000 turns.

[0012] In the aforementioned magnetically driven low-pulse plunger pump, the diameter of the magnetic plunger is 3 mm.

[0013] In the aforementioned magnetically driven low-pulse plunger pump, the stroke length of the magnetic plunger is 15 mm.

[0014] Compared with existing technologies, the advantages of this utility model are as follows.

[0015] 1. The device achieves superposition and smoothing of flow through the design of dual chambers and electromagnetic drive components, which significantly reduces output pulsation. At the same time, the discharge phases of the two chambers are staggered by half a cycle, and their output flow waveforms are superimposed and fill the troughs, making the total output flow very smooth and continuous.

[0016] 2. This device utilizes a non-mechanical transmission and magnetic drive, which is non-contact, eliminating the wear, vibration, and noise caused by traditional motors and crank-connecting rod mechanisms. Moreover, only fluid sealing needs to be addressed between the plunger and the pump body, without needing to consider rotational dynamic sealing, thus reducing the risk of leakage.

[0017] 3. The device has a compact structure, with the electromagnetic coil directly wrapped around the outside of the pump body. The overall structure is simple and the axial dimension is small. At the same time, by adjusting the frequency and magnitude of the drive current, the movement speed, stroke and output flow of the plunger can be precisely controlled. Attached Figure Description

[0018] Figure 1 This is a structural cross-sectional view of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model.

[0020] In the figure: pump body 1, working chamber 11, first chamber 12, second chamber 13, magnetic plunger 2, electromagnetic drive assembly 3, first check valve assembly 4, first check valve 41, first check valve inlet 42, first check valve outlet 43, second check valve assembly 5, second check valve 51, second check valve inlet 52, second check valve outlet 53. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-2 As shown, a magnetically driven low-pulse plunger pump includes a pump body 1 with a working chamber 11. A magnetic plunger 2 is axially movable within the pump body 1, capable of axially dividing the working chamber 11 into a first chamber 12 and a second chamber 13. An electromagnetic drive assembly 3 is arranged circumferentially outside the pump body 1, enabling the magnetic plunger 2 to reciprocate axially along the pump body 1. A first check valve assembly 4, connected to the first chamber 12, is located at one end of the pump body 1, and a second check valve assembly 5, connected to the second chamber 13, is located at the other end of the pump body 1. Utilizing non-contact drive, the electromagnetic drive assembly 3 is completely isolated from the magnetic plunger 2, with no mechanical connection. This results in extremely high reliability, long lifespan, low noise, and no need for lubrication. Simultaneously, the check valves ensure unidirectional fluid flow, allowing the dual-chamber structure to work collaboratively, achieving continuous suction and discharge processes. The symmetrical arrangement of the check valve assemblies at both ends ensures that the pressure at the fluid inlet and outlet cancels out the effects on the pump body 1, improving the pump's stress state.

[0023] The first check valve assembly 4 includes a first check valve 41 disposed at one end of the pump body 1. The first check valve 41 has a first check valve inlet 42 located on one side of the pump body 1 and a first check valve outlet 43 located on the other side of the pump body 1.

[0024] Specifically, the second check valve assembly 5 includes a second check valve 51 disposed at one end of the pump body 1 away from the first check valve 41. The second check valve 51 has a second check valve inlet 52 located on one side of the pump body 1 and a second check valve outlet 53 located on the other side of the pump body 1.

[0025] Meanwhile, the magnetic plunger 2 incorporates a permanent magnet assembly, which consists of an axially magnetized array of ring-shaped neodymium iron boron magnets. The magnetization direction of the permanent magnet assembly is parallel to the axis of motion of the magnetic plunger 2. This design provides extremely strong magnetic force, enabling sufficient driving force even with a small plunger volume. This allows for pump miniaturization and high power density, which is crucial for achieving linear drive.

[0026] Furthermore, the electromagnetic drive assembly 3 is circumferentially arranged around the outside of the pump body 1 and extends from one end of the pump body 1 to the other. The coil covers the entire plunger stroke, which means that the plunger can be effectively driven by electromagnetic force at any position in its movement path, avoiding dead point problems and ensuring the continuity and controllability of the movement. At the same time, the circumferential arrangement can generate a relatively uniform axial magnetic field, which is beneficial to the smooth movement of the plunger.

[0027] Furthermore, the electromagnetic drive assembly 3 includes at least two independently controlled solenoid coils, with the two solenoid coils receiving drive currents with a 180° phase difference. By coordinating the control of the currents in the two coils, greater thrust can be provided when the magnetic plunger 2 needs acceleration, and braking force or reverse pull can be provided when deceleration or reversal is required, achieving precise motion control and high dynamic response.

[0028] Specifically, the length of the electromagnetic drive assembly 3 is less than the length of the pump body 1. This is a clever safety design; the movement range of the magnetic plunger 2 is physically limited to the area covered by the coil. Even if the control system fails, the magnetic plunger 2 will not collide with the end cap of the pump body 1, preventing damage to the mechanical structure.

[0029] Specifically, the solenoid coil, located on the outside of the pump body 1, has 2000 turns. The driving voltage is less than 12V, the flow rate range is 0-10mL / min, the electromagnetic drive component 3 is passively cooled, and the heating power of the solenoid coil is approximately 0.5W, using forced air cooling.

[0030] Preferably, the diameter of the magnetic plunger 2 is 3 mm.

[0031] In addition, the stroke length of the magnetic plunger 2 is 15mm.

[0032] The principle of this embodiment is as follows: The electromagnetic drive assembly 3 receives a drive current with a 180° phase difference between its two sets of solenoid coils, generating an alternating axial magnetic field. The annular neodymium iron boron magnet array built into the magnetic plunger 2 reciprocates along the pump body 1 under the influence of the magnetic field. The electromagnetic drive assembly 3 surrounds the outside of the pump body 1 and is shorter than the length of the pump body 1, ensuring that the magnetic field covers the stroke range of the magnetic plunger 2 and provides continuous driving force. When the magnetic plunger 2 moves towards the first one-way valve assembly 4, the inlet 42 of the first one-way valve closes and the outlet 43 of the first one-way valve opens, allowing the liquid in the first chamber 12 to be... The liquid is squeezed out, and at the same time, the inlet 52 of the second one-way valve opens and the outlet 53 of the second one-way valve closes, drawing the liquid into the second chamber 13. Similarly, when the magnetic plunger 2 moves toward the second one-way valve assembly 5, the inlet 52 of the second one-way valve closes and the outlet 53 of the second one-way valve opens, squeezing the liquid out of the second chamber 13. At the same time, the inlet 42 of the first one-way valve opens and the outlet 43 of the first one-way valve closes, drawing the liquid into the first chamber 12. The suction and discharge actions of the two chambers alternate, and the output liquids complement each other, greatly reducing flow pulses and achieving stable delivery.

[0033] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses terms such as pump body 1, working chamber 11, first chamber 12, second chamber 13, magnetic plunger 2, electromagnetic drive assembly 3, first check valve assembly 4, first check valve 41, first check valve inlet 42, first check valve outlet 43, second check valve assembly 5, second check valve 51, second check valve inlet 52, and second check valve outlet 53, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A magnetically driven low-pulse plunger pump, comprising a pump body (1) having a working chamber (11), characterized in that, The pump body (1) is axially movable and equipped with a magnetic plunger (2) that can axially divide the working chamber (11) into a first chamber (12) and a second chamber (13). The pump body (1) is circumferentially equipped with an electromagnetic drive assembly (3) that can make the magnetic plunger (2) reciprocate along the pump body (1) axis. One end of the pump body (1) is equipped with a first check valve assembly (4) that communicates with the first chamber (12), and the other end of the pump body (1) is equipped with a second check valve assembly (5) that communicates with the second chamber (13).

2. The magnetically driven low-pulse plunger pump according to claim 1, characterized in that, The first check valve assembly (4) includes a first check valve (41) disposed at one end of the pump body (1), the first check valve (41) having a first check valve inlet (42) located on one side of the pump body (1) and a first check valve outlet (43) located on the other side of the pump body (1).

3. A magnetically driven low-pulse plunger pump according to claim 2, characterized in that, The second check valve assembly (5) includes a second check valve (51) disposed at one end of the pump body (1) away from the first check valve (41). The second check valve (51) has a second check valve inlet (52) located on one side of the pump body (1) and a second check valve outlet (53) located on the other side of the pump body (1).

4. A magnetically driven low-pulse plunger pump according to claim 1, 2, or 3, characterized in that, The magnetic plunger (2) has a built-in permanent magnet assembly, which is composed of an axially magnetized annular neodymium iron boron magnet array, and the magnetization direction of the permanent magnet assembly is parallel to the movement axis of the magnetic plunger (2).

5. A magnetically driven low-pulse plunger pump according to claim 4, characterized in that, The electromagnetic drive assembly (3) is circumferentially arranged around the outside of the pump body (1) and extends from one end of the pump body (1) to the other end.

6. A magnetically driven low-pulse plunger pump according to claim 5, characterized in that, The electromagnetic drive assembly (3) includes at least two independently controlled solenoid coils, with the two solenoid coils receiving drive currents with a phase difference of 180°.

7. A magnetically driven low-pulse plunger pump according to claim 4, characterized in that, The length of the electromagnetic drive component (3) is less than the length of the pump body (1).

8. A magnetically driven low-pulse plunger pump according to claim 6, characterized in that, The solenoid coil is set on the outside of the pump body (1) with 2000 turns.

9. A magnetically driven low-pulse plunger pump according to claim 1, characterized in that, The diameter of the magnetic plunger (2) is 3 mm.

10. A magnetically driven low-pulse plunger pump according to claim 1, characterized in that, The stroke length of the magnetic plunger (2) is 15 mm.

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