A DC reciprocating linear motor and its application device

Abstract

The present invention belongs to the technical field of linear motors, and provides a direct current reciprocating linear motor, including a stator, a mover, an end cover and a mover guide rod, wherein the stator includes an inner shell made of non-magnetic material, a stator winding arranged on the periphery of the inner shell and an outer shell arranged on the periphery of the stator winding, the mover is slidably arranged in the inner shell, the mover includes a non-magnetic mover body and two permanent magnet mover bodies arranged on the left and right sides of the non-magnetic mover body, the non-magnetic mover body is made of magnetic conductive material, the two permanent magnet mover bodies are fixedly connected to the non-magnetic mover body, and the ends thereof connected to the non-magnetic mover body have the same magnetic properties, there are two end covers, which are respectively arranged at the left and right ends of the stator, the mover is provided with a mover guide rod through hole along its axial direction, the mover guide rod passes through the mover guide rod through hole, and its left and right ends are connected to the end covers. The direct current reciprocating linear motor provided by the present invention has a simple structure and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a direct current reciprocating linear motor and an integrated application device thereof. Background Art

[0002] A reluctance linear oscillation motor disclosed in Chinese patent CN101136576A, such as Figure 7 As shown, the reluctance linear oscillation motor includes a hollow mover made of non-magnetic material, two electromagnetic coils with outer iron core yokes arranged on the periphery of the hollow mover, and a cylindrical mover provided with an air gap support ring. When working, pulsed direct current with different phases is used and supplied to the two electromagnetic coils in turn through a unipolar drive circuit, so that the working magnetic field generated by them forms a back-and-forth displacement at both ends of the motor, and the mover relies on the magnetic resistance pulling force generated by the "minimum magnetic resistance principle" to achieve linear motion. The disadvantage of the above scheme is that the motor structure is complex, and the mover completely relies on the magnetic field generated by the electromagnetic coil to achieve linear motion using the "minimum magnetic resistance principle", which has low efficiency. Summary of the invention

[0003] In view of the defects in the prior art, an object of the present invention is to provide a DC reciprocating linear motor to make the linear motor simpler in structure and more efficient.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a DC reciprocating linear motor, comprising a stator, a mover, an end cover and a mover guide rod, the stator comprising an inner shell, a stator winding and an outer shell, the inner shell is made of non-magnetic material, the stator winding is arranged on the periphery of the inner shell, the outer shell is arranged on the periphery of the stator winding, the mover is slidably arranged in the inner shell, the mover comprises a non-magnetic mover body and two permanent magnet mover bodies arranged on the left and right sides of the non-magnetic mover body, the non-magnetic mover body is made of magnetic conductive material, the two permanent magnet mover bodies are fixedly connected to the non-magnetic mover body, and the ends thereof connected to the non-magnetic mover body have the same magnetic properties, there are two end covers, which are respectively arranged at the left and right ends of the stator, the mover is provided with a mover guide rod through hole along its axial direction, the mover guide rod passes through the mover guide rod through hole, and its left and right ends are connected to the end covers.

[0005] Furthermore, the mover guide rod is fixedly connected to the mover, and the mover guide rod is slidably connected to the end cover.

[0006] Furthermore, the mover guide rod is slidably connected to the mover, and the mover guide rod is fixedly connected to the end cover.

[0007] Furthermore, mover commutation sensors are symmetrically arranged at left and right ends of the inner circumferential surface of the stator close to the end cover or on the end surface of the end cover facing the mover.

[0008] Furthermore, a buffer spring is provided between the end cover and the mover, one end of the buffer spring is fixedly connected to the end cover or the end surface of the mover, and the other end of the buffer spring freely extends inside the stator.

[0009] On the other hand, an application device includes the above-mentioned DC reciprocating linear motor.

[0010] Furthermore, the application device is a linear reciprocating kinetic energy transfer device, a linear vacuum pump, a linear compressor and a linear heat exchange pump.

[0011] Beneficial effects of the present invention:

[0012] 1. A DC reciprocating linear motor provided by the present invention comprises a stator, a mover and an end cover, wherein the stator comprises an inner shell, a stator winding and an outer shell, wherein the inner shell is made of non-magnetic material, the stator winding is arranged on the periphery of the inner shell, the outer shell is arranged on the periphery of the stator winding, the mover is slidably arranged in the inner shell, the mover comprises a non-magnetic mover body and two permanent magnet mover bodies arranged on the left and right sides of the non-magnetic mover body, the non-magnetic mover body is made of magnetic conductive material, the two permanent magnet mover bodies are fixedly connected to the non-magnetic mover body, and the end connected to the non-magnetic mover body has the same magnetic properties, and the end cover is arranged on the left and right ends of the stator. The structure is simple.

[0013] 2. The DC reciprocating linear motor provided by the present invention utilizes the magnetic field generated by the energized stator winding and the magnetic field generated by the permanent magnet mover body to achieve the purpose of linear motion of the mover in the stator according to the principle that like magnetic poles repel each other and opposite magnetic poles attract each other. Compared with the linear motion achieved by utilizing the "principle of minimum magnetic resistance", it is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0015] Figure 1 A cross-sectional view of a DC reciprocating linear motor provided by one embodiment of the present invention;

[0016] Figure 2A cross-sectional view of a DC reciprocating linear motor provided by another embodiment of the present invention;

[0017] Figure 3 , Figure 4 for Figure 1 A schematic diagram of a DC reciprocating linear motor is shown;

[0018] Figure 5 A linear reciprocating kinetic energy transmission device using the above DC reciprocating linear motor;

[0019] Figure 6 A linear vacuum pump using the DC reciprocating linear motor;

[0020] Figure 7 This is a structural schematic diagram of a reciprocating linear motion brushless motor disclosed in patent CN101136576A.

[0021] Reference numerals:

[0022] 1- stator; 11- inner shell; 12- stator winding; 13- outer shell; 2- mover; 21- non-magnetic mover body; 22- permanent magnet mover body; 23- mover guide rod through hole; 301- end cover; 401- mover guide rod; 5- mover reversing sensor; 6- buffer spring; 7- mover sleeve; 8- sealing coil; 9- inlet valve; 10- outlet valve. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0024] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0025] In the description of the present application, it should be understood that the terms "center", "left", "right", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] like Figure 1 As shown, an embodiment of a DC reciprocating linear motor provided by the present invention includes a stator 1, a mover 2, an end cover 301 and a mover guide rod 401, the stator 1 includes an inner shell 11, a stator winding 12 and an outer shell 13, the inner shell 11 is made of non-magnetic material, the stator winding 12 is arranged on the periphery of the inner shell 11, the outer shell 13 is arranged on the periphery of the stator winding 12, the mover 2 is slidably arranged in the inner shell 11, preferably, a gasket for maintaining an air gap is arranged between the mover 2 and the stator 1, which is not shown in the drawings, to ensure that the air gap between the mover 2 and the stator 1 is uniform and the movement is reliable. The mover 2 includes a non-magnetic mover body 21 and two permanent magnet mover bodies 22 arranged on the left and right sides of the non-magnetic mover body 21. The non-magnetic mover body 21 is made of magnetic conductive material. The two permanent magnet mover bodies 22 are fixedly connected to the non-magnetic mover body 21, and the ends connected to the non-magnetic mover body 21 have the same magnetic properties. There are two end covers 301, which are respectively arranged at the left and right ends of the stator 1. The mover 2 is provided with a mover guide rod through hole 23 along its axial direction. The mover guide rod 401 passes through the mover guide rod through hole 23, and its left and right ends are connected to the end covers 301.

[0029] As an improvement of the above solution, the mover guide rod 401 is fixedly connected to the mover 2, and the mover guide rod 401 is slidably connected to the end cover 301. With such a design, the mover guide rod 401 can directly transfer kinetic energy to the outside. Preferably, a mover sleeve 7 is provided between the mover guide rod 401 and the mover 2, and such a design can reduce the damage caused to each other by the direct interference fit between the mover 2 and the mover guide rod 401.

[0030] like Figure 2 As shown, the present invention provides another embodiment of a DC reciprocating linear motor, including a stator 1, a mover 2, an end cover 301 and a mover guide rod 401, wherein the stator 1 includes an inner shell 11, a stator winding 12 and an outer shell 13, wherein the inner shell 11 is made of non-magnetic material, the stator winding 12 is arranged on the periphery of the inner shell 11, and the outer shell 13 is arranged on the periphery of the stator winding 12, and the mover 2 is slidably arranged in the inner shell 11, and preferably, a gasket for maintaining an air gap is arranged between the mover 2 and the stator 1, which is not shown in the accompanying drawings, to ensure that the air gap between the mover 2 and the stator 1 is uniform and the movement is reliable. The mover 2 includes a non-magnetic mover body 21 and two permanent magnet mover bodies 22 arranged on the left and right sides of the non-magnetic mover body 21. The non-magnetic mover body 21 is made of magnetic conductive material. The two permanent magnet mover bodies 22 are fixedly connected to the non-magnetic mover body 21, and the ends connected to the non-magnetic mover body 21 have the same magnetic properties. There are two end covers 301, which are respectively arranged at the left and right ends of the stator 1. The mover 2 is provided with a mover guide rod through hole 23 along its axial direction. The mover guide rod 401 passes through the mover guide rod through hole 23, and its left and right ends are connected to the end covers 301.

[0031] As an improvement of the above scheme, the mover guide rod 401 is slidably connected to the mover 2, and the mover guide rod 401 is fixedly connected to the end cover 301. Preferably, a mover sleeve 7 is provided between the mover guide rod 401 and the mover 2, and such a design can reduce the wear on the mover 2 caused by relative sliding between the mover 2 and the mover guide rod 401. Such a design is convenient for when the inner circumference of the stator, the end face of the mover, and the end face of the end cover facing the mover together form a closed space, the DC reciprocating linear motor provided in this embodiment is used for a compressor, etc.

[0032] As an improvement of the above scheme, mover commutation sensors 5 are symmetrically arranged at the left and right ends of the inner circumference of the stator 1 near the end cover 301 or the end cover 301 or on the end surface of the end cover 301 or the end cover 301 facing the mover 2. The mover commutation sensor 5 is connected to the input end of the operating circuit switch device drive of the DC reciprocating linear motor, the left and right ports of the stator winding 12 of the DC reciprocating linear motor are connected to the output and input ports of the bridge switch device, and the operating circuit switch device drive is connected to the bridge switch device (not shown in the drawings). Such a design can make the reciprocating linear motion of the DC reciprocating linear motor more natural and more accurate.

[0033] As an improvement of the above solution, a buffer spring 6 is provided between the end cover 301 or the end cover 301 and the mover 2, one end of the buffer spring 6 is fixedly connected to the end cover 301, the end cover 301 or the mover 2, and the other end thereof freely extends inside the stator 1. Such a design can not only reduce the impact of the mover 2 on the end cover 301 or the end cover 301, but also store some energy to make the direction change faster.

[0034] The working principle of the present invention is as follows: Figure 3 , Figure 4 As shown, when the stator winding 12 is powered on, the current is input from the left end, and the stator winding 12 will generate a magnetic field. According to the right-hand screw rule, the magnetic pole distribution inside the stator winding 12 is N pole on the left and S pole on the right. These magnetic poles will interact with the N poles on the left and right ends of the mover 2. According to the principle that like magnetic poles repel each other and opposite magnetic poles attract each other, the mover 2 moves to the right and compresses the buffer spring 6. When the mover 2 contacts the mover commutation sensor 5, the current direction is changed to input from the right end. According to the right-hand screw rule, the magnetic pole distribution inside the stator winding 12 is S pole on the left and N pole on the right. These magnetic poles will interact with the N poles on the left and right ends of the mover 2. According to the principle that like magnetic poles repel each other and opposite magnetic poles attract each other, the mover 2 moves to the left. Similarly, when the mover 2 contacts the mover commutation sensor 5 on the other side, the current direction changes, and the movement direction of the mover 2 changes, so as to realize the reciprocating linear motion of the mover 2.

[0035] The DC reciprocating linear motor provided by the present invention can be used for, but not limited to, a linear reciprocating kinetic energy transfer device, a linear vacuum pump, a linear compressor and a linear heat exchange pump.

[0036] When the above DC reciprocating linear motor is applied to a linear reciprocating kinetic energy transmission device, such as Figure 5 As shown, the mover 2 is fixedly connected to the mover guide rod 401, the mover guide rod 401 is slidably connected to the end cover 301, and the mover guide rod 401 outputs kinetic energy to the outside.

[0037] When the above DC reciprocating linear motor is applied to a linear vacuum pump, a linear compressor or a linear heat exchange pump, such as Figure 6 As shown, the mover guide rod 401 is slidably connected to the mover 2, the mover guide rod 401 is fixedly connected to the end cover 301, and the inner circumferential surface of the stator 1, the end surface of the mover 2 and the end surface of the end cover 301 facing the mover together form a closed space, and a control valve for the inlet and outlet of the fluid is arranged on the stator 1 or the end cover 301, and the control valve can be a two-way inlet / outlet air control valve or a one-way control valve.

[0038] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A DC reciprocating linear motor, characterized in that: The invention comprises a stator (1), a mover (2), an end cover (301) and a mover guide rod (401); the stator (1) comprises an inner shell (11), a stator winding (12) and an outer shell (13); the inner shell (11) is made of a non-magnetic material; the stator winding (12) is arranged on the periphery of the inner shell (11); the outer shell (13) is arranged on the periphery of the stator winding (12); the mover (2) is slidably arranged in the inner shell (11); the mover (2) comprises a non-magnetic mover body (21) and two left and right sides of the non-magnetic mover body (21) The permanent magnet mover body (22) is disposed on the side of the stator (1), the non-magnetic mover body (21) is made of a magnetic conductive material, the two permanent magnet mover bodies (22) are fixedly connected to the non-magnetic mover body (21), and the ends thereof connected to the non-magnetic mover body (21) have the same magnetic properties, there are two end covers (301), which are respectively arranged at the left and right ends of the stator (1), the mover (2) is provided with a mover guide rod through hole (23) along its axial direction, the mover guide rod (401) passes through the mover guide rod through hole (23), and its left and right ends are connected to the end covers (301); Wherein, mover commutation sensors (5) are symmetrically arranged at the left and right ends of the inner circumference of the stator (1) near the end cover (301) or on the end surface of the end cover (301) facing the mover (2), and the mover commutation sensors (5) are connected to the driving input end of the operating circuit switch device of the DC reciprocating linear motor, the left and right ports of the stator winding (12) of the DC reciprocating linear motor are connected to the output and input ports of the bridge switch device, and the operating circuit switch device drive is connected to the bridge switch device.

2. The DC reciprocating linear motor according to claim 1, characterized in that: The mover guide rod (401) is fixedly connected to the mover (2), and the mover guide rod (401) is slidably connected to the end cover (301).

3. The DC reciprocating linear motor according to claim 1, characterized in that: The mover guide rod (401) is slidably connected to the mover (2), and the mover guide rod (401) is fixedly connected to the end cover (301).

4. The DC reciprocating linear motor according to claim 1, characterized in that: A buffer spring (6) is provided between the end cover (301) and the mover (2); one end of the buffer spring (6) is fixedly connected to the end cover (301) or the end surface of the mover (2), and the other end of the buffer spring (6) freely extends inside the stator (1).

5. An application device, characterized in that: A DC reciprocating linear motor comprising any one of claims 1 to 4.

6. The application device according to claim 5, characterized in that: The application device is a linear reciprocating kinetic energy transmission device, a linear vacuum pump, a linear compressor or a linear heat exchange pump.

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