A magnetic levitation linear motor and a plunger pump

Abstract

The utility model provides a kind of magnetic suspension linear motor and plunger pump, the magnetic suspension linear motor includes motor shell, motor shaft, the motor shaft is installed in the motor shell and can be moved along the axial direction of motor shaft, the both ends of the motor shaft are equipped with second permanent magnet group, the first permanent magnet group is installed on the motor shell, the first permanent magnet group is located between the both ends second permanent magnet group of motor shaft position, the first permanent magnet group with the second permanent magnet group of the both ends of the motor shaft is mutually repulsive to reach motor shaft balance stationary state.The motor shell is installed with coil, the coil energization acts on the motor shaft to realize motor shaft relative to the motor shell back and forth linear movement.

Description

Technical Field

[0001] This utility model relates to a magnetic levitation linear motor and a plunger pump. Background Technology

[0002] Most water flosser pumps on the market use a rotary motor to drive a turntable with a cam, and the cam drives the piston of the plunger pump.

[0003] The prior art discloses a working mechanism for a dental flosser (CN216495767U), which uses a linear motor to drive a plunger pump. Specifically, the plunger pump is driven by a drive coil driving permanent magnets at both ends. The linear motor uses a spring to generate an elastic force that returns the motor shaft to its original position. However, the spring loses energy and generates additional resistance when it deforms in water, resulting in poor recovery ability. Utility Model Content

[0004] The main objective of this invention is to provide a magnetically levitated linear motor, specifically offering the following solution:

[0005] A magnetic levitation linear motor includes a motor housing, a motor shaft, and a coil. The motor shaft is a magnetic conductor and is installed inside the motor housing, allowing it to move along its axial direction. A first permanent magnet assembly is installed on the motor housing. The coil is energized to enable the motor shaft to move back and forth linearly relative to the motor housing. The first permanent magnet assembly acts on the motor shaft to enable it to return to its original position after movement.

[0006] Furthermore, a second permanent magnet assembly is installed at both ends of the motor shaft, and the first permanent magnet assembly is located between the two ends of the motor shaft. The opposite sides of the two ends of the second permanent magnet assembly have the same polarity, which is the first polarity; the opposite sides of the first permanent magnet assembly facing the motor shaft have the same polarity, which is the second polarity; the first polarity and the second polarity are the same.

[0007] Furthermore, the second permanent magnet assembly is bonded or riveted to the motor shaft.

[0008] Furthermore, a locking groove is provided on the outer side of the motor housing, and the first permanent magnet assembly is locked in the locking groove.

[0009] Furthermore, the first permanent magnet assembly includes a first semi-circular permanent magnet and a second semi-circular permanent magnet, which surround the motor shaft, and the first and second semi-circular permanent magnets have the same polarity on opposite sides.

[0010] This utility model also provides a plunger pump, including the magnetic levitation linear motor described above. The motor housing has movable cavities at both ends corresponding to the movement of the first permanent magnet. One movable cavity at one end has a water inlet, and the other movable cavity at the other end has a water outlet. A liquid flow channel is provided between the two movable cavities, and the liquid flow channel is provided with a water inlet check valve and a water outlet check valve.

[0011] Beneficial effect: The structure of this utility model generates axial magnetic levitation, eliminating the need for spring reset.

[0012] The structure of this invention generates radial magnetic levitation, reducing the irregular radial oscillation of the piston body and decreasing the friction with the plunger pump wall. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a structural diagram of a magnetic levitation linear motor;

[0015] Figure 2 This is an exploded structural diagram of a magnetic levitation linear motor.

[0016] Figure 3 This is a cross-sectional structural diagram of a magnetic levitation linear motor. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] See Figures 1 to 3 A magnetic levitation linear motor includes a motor housing 1, a motor shaft 2, and a coil 3. The motor shaft 2 is a magnetic conductor. The motor shaft 2 is installed inside the motor housing 1 and can move along the axial direction of the motor shaft 2. A first permanent magnet group 5 is installed on the motor housing 1. The coil 3 is energized to realize the linear back-and-forth movement of the motor shaft 2 relative to the motor housing 1. The first permanent magnet group 5 is used to act on the motor shaft 2 to realize the return of the motor shaft after movement.

[0022] In this invention, when the second permanent magnet assembly is not installed, when the coil drives the magnetic conductor to deviate from the center position, the first permanent magnet assembly generates a return attraction force on the magnetic conductor, achieving springless return. In this case, the first permanent magnet assembly can be a single permanent magnet or multiple permanent magnets.

[0023] Furthermore, a second permanent magnet group 4 is installed at both ends of the motor shaft 2. The first permanent magnet group is located between the two ends of the motor shaft 2 and the second permanent magnet group 4. The opposite sides of the two ends of the second permanent magnet group 4 (here, side A) have the same polarity, which is the first polarity. The side of the first permanent magnet group facing the motor shaft (here, side B) has the same polarity, which is the second polarity. The first polarity and the second polarity are the same.

[0024] In this invention, when a second permanent magnet assembly is installed, the driven assembly consisting of a magnetic conductor and a second permanent magnet assembly has a certain magnetic strength. When the length of the magnetic conductor is long enough, the polarity of the end of the driven assembly is the opposite polarity of the first polarity. Except for the end, the polarity is the first polarity, and the polarity is stronger near point A, thus generating axial and radial repulsive forces with the first permanent magnet assembly. Because the opposing sides of the second permanent magnet groups 4 at both ends of the motor shaft 2 have the same polarity, the interaction between the first permanent magnet group 5 and the second permanent magnet groups 4 at both ends of the motor shaft 2 keeps the motor shaft in a floating and stationary state in axial balance. When the coil 3 causes the motor shaft 2 to move away from its equilibrium position, the force exerted by the first permanent magnet group 5 on the second permanent magnet groups 4 at both ends of the motor shaft 2 is different, and the force difference can be used to return the motor shaft 2 to its original position, achieving springless return. Furthermore, the opposing sides of the first permanent magnet groups facing the motor shaft have the same polarity, both being the second polarity; the first polarity and the second polarity are the same, which can achieve radial magnetic levitation with the motor shaft 2, reducing the radial irregular oscillation of the piston body and reducing the friction with the piston cavity. Compared with the existing technology that uses springs, energy loss is small, and the current required by the coil to drive the motor shaft is small, which saves more energy. In this case, the first permanent magnet group can be two permanent magnets with the same polarity facing the axis, or multiple permanent magnets with the same polarity facing the axis.

[0025] Furthermore, the second permanent magnet assembly 4 is bonded or riveted to the motor shaft 2.

[0026] Furthermore, a locking groove 12 is provided on the outer side of the motor housing 1, and the first permanent magnet assembly 5 is locked in the locking groove 12.

[0027] Furthermore, the first permanent magnet group 5 includes a first semi-circular permanent magnet 51 and a second semi-circular permanent magnet 52, which surround the motor shaft 2, and the first semi-circular permanent magnet 51 and the second semi-circular permanent magnet 52 have the same polarity on opposite sides.

[0028] This utility model also provides a plunger pump, including the magnetic levitation linear motor described above. The motor housing 1 has movable cavities 11 at both ends corresponding to the movement of the first permanent magnet. One movable cavity 11 has an inlet 111, and the other movable cavity 11 has an outlet 112. A liquid flow channel 113 is provided between the two movable cavities 11, and the liquid flow channel 113 is equipped with an inlet one-way valve 114 and an outlet one-way valve 115. Of course, to enhance the pumping capacity, this linear motor can be connected in series.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A magnetic levitation linear motor, comprising a motor housing, a motor shaft, and a coil, wherein the motor shaft is a magnetic conductor, the motor shaft is installed inside the motor housing and can move along the axial direction of the motor shaft, a first permanent magnet assembly is installed on the motor housing, the coil is energized to realize the motor shaft moving back and forth linearly relative to the motor housing, and the first permanent magnet assembly is used to act on the motor shaft to realize the motor shaft returning to its original position after movement.

2. A magnetic levitation linear motor as described in claim 1, characterized in that, A second permanent magnet assembly is installed at both ends of the motor shaft. The first permanent magnet assembly is located between the two second permanent magnet assemblies at both ends of the motor shaft. The opposite sides of the second permanent magnet assemblies at both ends of the motor shaft have the same polarity, which is the first polarity. The opposite sides of the first permanent magnet assembly facing the motor shaft have the same polarity, which is the second polarity. The first polarity and the second polarity are the same.

3. A magnetic levitation linear motor as described in claim 2, characterized in that, The second permanent magnet assembly is attached to the motor shaft by bonding or riveting.

4. A magnetic levitation linear motor as described in claim 2, characterized in that, The outer side of the motor housing is provided with a locking groove, and the first permanent magnet assembly is locked in the locking groove.

5. A magnetic levitation linear motor as described in claim 2, characterized in that, The first permanent magnet assembly includes a first semi-circular permanent magnet and a second semi-circular permanent magnet, which surround the motor shaft. The first and second semi-circular permanent magnets have the same polarity on opposite sides.

6. A plunger pump, comprising a magnetic levitation linear motor as described in any one of claims 1-5, wherein each end of the motor housing is provided with a movable cavity corresponding to the movement of a first permanent magnet, wherein a water inlet is provided in the movable cavity at one end and a water outlet is provided in the movable cavity at the other end, and a liquid flow channel is provided between the two movable cavities, wherein the liquid flow channel is provided with an inlet one-way valve plate and an outlet one-way valve plate.

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