Electromagnetic vibration absorber, electromagnetic vibration reduction device and drum washing machine

Abstract

The present application relates to an electromagnetic vibration damper, an electromagnetic vibration damping device, and a drum washing machine, and belongs to the field of mechanical equipment technology. The electromagnetic vibration damper includes a stator, a first coil, and a mover; the stator has a cylindrical structure with one end closed and the other end open, and the side wall of the cylindrical structure has a cavity; the first coil is located in the cavity, the first coil is coaxial with the cylindrical structure, and is connected to the stator; the mover includes a shaft structure and a magnetic body, one end of the shaft structure is located in the cylindrical structure and is slidably connected to the stator, the magnetic body is located in the cylindrical structure, the first end of the magnetic body is opposite to the first coil, and the magnetic body is connected to the shaft structure. The use of this application can improve the vibration reduction effect of the electromagnetic vibration damper.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to an electromagnetic vibration damper, an electromagnetic vibration damping device and a drum washing machine. Background Art

[0002] Today, front-loading washing machines have become a mainstream choice for household washing machines due to their advantages, such as minimal wear and tear on clothes. During operation, the drum rotates, driving the clothes and water. Due to the heavy weight of the clothes and water, this generates a large centrifugal force, causing the drum to vibrate violently. This vibration not only produces noise but also accelerates the wear of many components within the washing machine.

[0003] Currently, a damping vibration absorber is usually provided between the outer drum and the washing machine housing to reduce the vibration of the drum during operation.

[0004] However, the damping shock absorber mainly relies on friction to reduce vibration, so the damping shock absorber will wear out during operation, resulting in a short service life. Summary of the Invention

[0005] The embodiments of the present application provide an electromagnetic vibration damper, an electromagnetic vibration damping device, and a drum washing machine, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present application provides an electromagnetic vibration absorber including a stator, a first coil, and a mover;

[0007] The stator has a cylindrical structure with one end closed and the other end open, and the side wall of the cylindrical structure has a cavity;

[0008] The first coil is located in the cavity, is coaxial with the cylindrical structure, and is connected to the stator; the mover includes a shaft structure and a magnetic body, one end of the shaft structure is located in the cylindrical structure and is slidingly connected to the stator, the magnetic body is located in the cylindrical structure, the first end of the magnetic body is opposite to the first coil, and the magnetic body is connected to the shaft structure.

[0009] In one possible implementation, the electromagnetic vibration absorber also includes a second coil, which is located in the cavity. The second coil is located on the side of the first coil close to the open end of the stator. The second coil is coaxial with the cylindrical structure and fixedly connected to the stator. The second end of the magnetic body is opposite to the second coil.

[0010] In a possible implementation, the first coil and the second coil are wound in opposite directions and are connected in series.

[0011] In a possible implementation, the first coil and the second coil have the same winding direction and are connected in parallel.

[0012] In a possible implementation, the stator includes a base, a casing, and a winding frame;

[0013] The base has a cylindrical structure with one end closed and the other end open;

[0014] The housing has a cylindrical structure with two ends open, and one end of the housing is connected to the open end of the base;

[0015] The winding frame has a cylindrical structure with two ends open. The winding frame is located in the machine cover and is connected to the machine cover. The cavity is formed between the winding frame and the machine cover.

[0016] The base, the machine cover and the winding frame are coaxial.

[0017] In one possible implementation, the two ends of the shaft structure respectively have a first shoulder structure and a second shoulder structure, the diameter of the first shoulder structure is smaller than the inner diameter of the base and larger than the inner diameter of the winding frame, and the diameter of the second shoulder structure is larger than the inner diameter of the opening end of the machine cover.

[0018] In a possible implementation, the stator further includes a plurality of bearings, which are respectively located in the housing and at both ends of the winding frame, the outer ring of the bearing is connected to the housing, and the inner ring of the bearing is slidably connected to the shaft structure.

[0019] In a possible implementation, the shaft structure includes a first shaft and a second shaft;

[0020] The first shaft body includes a first shaft segment and a second shaft segment. The diameter of the first shaft segment is larger than that of the second shaft segment. One end of the first shaft segment is located in the cylindrical structure and is slidably connected to the stator. The second shaft segment is located in the cylindrical structure and is coaxially connected to the first shaft segment.

[0021] The second shaft body has an axial through hole, the through hole of the second shaft body surrounds the second shaft segment, and the second shaft body is connected to the second shaft segment;

[0022] The magnetic body is located between the first shaft segment and the second shaft body, and is connected to the second shaft segment.

[0023] In a second aspect, an embodiment of the present application provides an electromagnetic vibration reduction device, characterized in that the electromagnetic vibration reduction device includes the electromagnetic vibration absorber as described in the first aspect and its possible implementation methods.

[0024] In a third aspect, an embodiment of the present application provides a drum washing machine, which includes the electromagnetic vibration reduction device as described in the second aspect.

[0025] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0026] An embodiment of the present application provides an electromagnetic vibration damper, which includes a stator, a first coil, and a mover. The side wall of the stator has a cavity, and the first coil is located in the cavity. The mover includes a shaft structure and a magnetic body. One end of the shaft structure is located within the stator and is slidably connected to the stator. The magnetic body is connected to the shaft structure and is located within the stator and opposite the first coil. In this way, when the first coil is energized, a magnetic field is generated at both ends of the first coil. This magnetic field exerts a force on the magnetic body, achieving vibration reduction through magnetic force. As a result, vibration reduction can be achieved without requiring a large friction between the mover and the stator, which can effectively increase the service life of the vibration damper.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 Schematic diagram of the structure of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0030] Figure 2 1 is a schematic structural diagram of a stator of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the structure of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the structure of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the structure of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0034] Figure 6 Schematic diagram of the structure of an electromagnetic vibration absorber shown in an embodiment of the present application;

[0035] Figure 7This is an exploded diagram of an electromagnetic vibration absorber shown in an embodiment of the present application.

[0036] Legend

[0037] 1. Stator;

[0038] 1a, cavity on the stator side wall; 1b, connecting through hole;

[0039] 11. Base; 12. Machine cover; 13. Winding frame; 14. Bearing;

[0040] 2. First coil;

[0041] 3. Second coil;

[0042] 4. Movers;

[0043] 41. Shaft structure; 42. Magnetic body; 43. Buffer pad;

[0044] 41a, first shoulder structure; 41b, second shoulder structure; 42a, first end of the magnetic body; 42b, second end of the magnetic body;

[0045] 411, first axis; 412, second axis;

[0046] 412a, an axial through hole of the second shaft;

[0047] 4111. A first shaft section of the first shaft; 4112. A second shaft section of the first shaft. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0049] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words “first”, “second”, “third” and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “a” or “an” do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as “include” or “comprise” mean that the elements or objects appearing before “include” or “comprises” include the elements or objects listed after “include” or “comprises” and their equivalents, and do not exclude other elements or objects. Words such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The embodiment of the present application provides an electromagnetic vibration absorber, such as Figure 1 As shown, the electromagnetic vibration absorber includes a stator 1 , a first coil 2 and a mover 4 . The mover 4 includes a shaft structure 41 and a magnetic body 42 .

[0051] The sidewall of the stator 1 has a cavity 1a, and the first coil 2 is located in the cavity 1a and connected to the stator 1. One end of the shaft structure 41 is located within the stator 1 and is slidably connected to the stator 1. The magnetic body 42 is located within the stator 1 and is connected to the shaft structure 41.

[0052] Below, each part of the electromagnetic vibration absorber is introduced separately:

[0053] 1. Stator 1

[0054] The stator 1 is a component of the electromagnetic vibration absorber for fixing and mounting the coil, and for slidingly connecting the mover 4 .

[0055] like Figure 1 As shown, the stator 1 has a cylindrical structure with one end open and the other end closed. The side wall of the cylindrical structure has a cavity 1 a, and the cavity 1 a is used to install the first coil 2.

[0056] The cavity 1 a on the side wall of the stator 1 may have a plurality of annular grooves therein, and the annular grooves may be used to limit the first coil 2 to prevent the first coil 2 from moving in the axial direction.

[0057] Optionally, the stator 1 may have a cylindrical structure or a rectangular cylindrical structure.

[0058] like Figure 2As shown, when the stator 1 has a cylindrical structure, the first inner diameter of the stator 1 may be d1, the second inner diameter of the stator 1 may be d2, and the third inner diameter of the stator 1 may be d3.

[0059] Optionally, the end of the stator 1 away from the opening may have a connecting through-hole 1 b, through which the stator 1 may be connected to an external device, which may be a base of a drum washing machine.

[0060] The stator 1 may be processed by Computer Numerical Control (CNC) cutting, milling on a lathe, or casting in a corresponding mold. The embodiment of the present application does not limit the processing method of the stator 1.

[0061] 2. First Coil 2

[0062] The first coil 2 is a component of the electromagnetic vibration absorber that is electrically connected to an external circuit to generate a magnetic field.

[0063] The first coil 2 is wound around the axis of the stator 1 in the cavity 1a of the stator 1. Figure 1 As shown, the first coil 2 is located in the cavity 1 a on the side wall of the stator 1 , and the first coil 2 is coaxial with the stator 1 .

[0064] The first coil 2 can be electrically connected to an external circuit via a wire.

[0065] like Figure 3 As shown, the two ends of the first coil 2 are connected to a first conductor 2a and a second conductor 2b, respectively. When current flows through the first coil 2, according to the right-hand screw rule (i.e., Ampere's law), magnetic fields with different magnetic poles are generated at the two ends of the first coil 2. When current flows into the first conductor 2a and out of the second conductor 2b, an S-pole magnetic field is generated on the side of the first coil 2 away from the open end, and an N-pole magnetic field is generated on the side of the first coil 2 closer to the open end. Correspondingly, when current flows into the second conductor 2b and out of the first conductor 2a, an N-pole magnetic field is generated on the side of the first coil 2 away from the open end, and an S-pole magnetic field is generated on the side of the first coil 2 closer to the open end.

[0066] The material of the first coil 2 may be any metal material with good electrical conductivity, such as copper, aluminum or silver.

[0067] 3. Movers 4

[0068] The mover 4 is a component of the electromagnetic vibration absorber that is connected to the stator 1 in a sliding manner and is connected to the device to be damped. Figure 1 As shown, the mover 4 includes a shaft structure 41 and a magnetic body 42 , and the magnetic body 42 is connected to the shaft structure 41 .

[0069] Axis structure 41

[0070] The shaft structure 41 is a component of the mover 4 used to connect to the magnetic body 42 and is slidably connected to the stator 1 .

[0071] like Figure 1 As shown, one end of the shaft structure 41 extending outside the stator 1 has a radial connecting hole 1b, through which the component to be damped can be fixedly connected to the shaft structure 41. The component to be damped can be the drum in a drum washing machine.

[0072] The diameter of the middle section of the shaft structure 41 is smaller, while the diameters of the front and rear sections are larger. The diameters of the front and rear sections of the shaft structure 41 can be D1, which is smaller than d2. The diameter of the middle section of the shaft structure 41 can be D2, and D1 and D2 satisfy the relationship D1=3D2.

[0073] In this way, when the mover 4 slides in the stator 1 , the shaft structure 41 and the stator 1 do not come into contact, which can reduce the wear between the mover 4 and the stator 1 and thus increase the service life of the electromagnetic vibration absorber.

[0074] Magnetic body 42

[0075] The magnetic body 42 is a component of the mover 4 that interacts with the first coil 2. The magnetic body 42 is located within the cylindrical structure of the stator 1, with the first end 42a of the magnetic body 42 facing the first coil 42. To facilitate installation, the magnetic body 42 can be configured in various shapes.

[0076] Optionally, the magnetic body 42 may have a strip-shaped structure.

[0077] When the magnetic body 42 has a strip-shaped structure, the magnetic body 42 is parallel to the axis of the shaft structure 41 and is connected to the shaft structure 41 .

[0078] In one example, there may be multiple magnetic bodies 42 , each of which has a strip-shaped structure and is evenly distributed around the shaft structure 41 . The first end 42 a of each magnetic body 42 is opposite to the first coil 42 .

[0079] In this way, the difficulty of processing the magnetic body 42 can be reduced.

[0080] Alternatively, the magnetic body 42 may have a cylindrical structure.

[0081] like Figure 1 As shown, the magnetic body 42 with a cylindrical structure is ring-shaped on the middle section of the shaft structure 41, the inner wall of the magnetic body 42 is connected to the outer wall of the middle section of the shaft structure 41, and the two end faces of the magnetic body 42 are respectively connected to the two opposite wall surfaces of the front and rear sections of the shaft structure 41.

[0082] like Figure 3 As shown, the direction of magnetic pole change of the magnetic body 42 is the same as the axial direction of the stator 1. In the magnetic body 42, the first end 42a is the S pole and the second end 42b is the N pole.

[0083] Thus, during the vibration of the device to be damped, when the device moves toward stator 1, mover 4 moves toward extending into stator 1. At this time, current flows into first coil 2 through first conductor 2a and out through second conductor 2b. The end of first coil 2 facing away from the stator 1 opening has the same magnetic properties as first end 42a of magnetic body 42, while the end of first coil 2 facing toward the stator 1 opening has different magnetic properties from first end 42a of magnetic body 42. Based on the principle that like charges repel and opposite charges attract, first coil 2 exerts a force on magnetic body 42 opposite to the direction of mover 4's movement. This force reduces the amplitude of mover 4's movement, thereby reducing the amplitude of the device to be damped. Similarly, when the device to be damped moves away from stator 1, mover 4 moves toward extending out of stator 1. At this time, by changing the direction of the current flowing through the first coil 2, the first coil 2 still exerts a force on the magnetic body 42 that is opposite to the movement direction of the mover 4. Under the action of this force, the movement amplitude of the mover 4 can be reduced, and then the electromagnetic vibration absorber can reduce the movement amplitude of the component to be damped.

[0084] When the magnetic body 42 has a cylindrical structure, the inner diameter of the magnetic body 42 may be d4, d4=D2, the outer diameter of the magnetic body 42 may be D1, and the inner wall of the magnetic body 42 and the outer wall of the middle section of the shaft structure 41 may be interference fit.

[0085] In this way, the connection between the magnetic body 42 and the shaft structure 41 can be made firm.

[0086] Below, some optional structural features of electromagnetic vibration absorbers are introduced respectively:

[0087] Structural feature 1: the stator 1 can be composed of multiple components. Figure 4 As shown, the stator 1 includes a base 11, a housing 12, and a winding frame 13. The base 11 has a cylindrical structure with one end closed and the other open. The housing 12 has a cylindrical structure with both ends open, one end of which is connected to the open end of the base 11. The winding frame 13 has a cylindrical structure with both ends open. The winding frame 13 is located within the housing 12 and is connected to the housing 12, forming a cavity 1a between the winding frame 13 and the housing 12. The base 11, housing 12, and winding frame 13 are coaxial.

[0088] Alternatively, as Figure 4 As shown, the outer wall of the base 11 may have a groove structure, and the inner wall of the cover 12 may have a protrusion structure.

[0089] In this way, the base 11 , the housing 12 and the winding frame 13 can be processed separately, and then the processed base 11 , the housing 12 and the winding frame 13 can be assembled together, which can reduce the processing difficulty of the stator 1 .

[0090] Optionally, the stator 1 may further include an insulating plate having an arc-shaped structure. The insulating plate may be installed between the housing 12 and the first coil 2 to prevent the housing 12 from contacting the energized coil and causing a short circuit.

[0091] As for the material of the stator 1, the base 11 and the machine cover 12 are both magnetic conductive materials, which can be metal materials with good mechanical properties, such as nickel-iron alloy, aluminum-magnesium alloy, etc. The winding frame 13 is a non-magnetic conductive material, such as ceramic material, etc., which is not limited in this embodiment of the present application.

[0092] Structural feature 2: In the mover 4 , the shaft structure 41 may have a first shaft shoulder structure 41 a and a second shaft shoulder structure 41 b .

[0093] like Figure 4 As shown, the first shoulder structure 41a and the second shoulder structure 41b are both located on the shaft structure 41 and outside the winding frame 13. The diameter of the first shoulder structure 41a is smaller than the inner diameter of the base 11 and larger than the inner diameter of the winding frame 13. The diameter of the second shoulder structure 41b is smaller than the outer diameter of the machine cover 12 and larger than the inner diameter of the open end of the machine cover 12.

[0094] In this way, the mover 4 can be prevented from falling off from the stator 1 due to excessive movement.

[0095] Structural feature three: the stator 1 may further include a plurality of bearings 14 .

[0096] like Figure 4 As shown, multiple bearings 14 are located within the housing 12 and at both ends of the winding frame 13. The outer rings of the bearings 14 are connected to the housing 12, and the inner rings of the bearings 14 are slidably connected to the shaft structure 41. The inner diameter of the bearings 14 can be d5, where d5 = D1, and the bearings 14 and the shaft structure 41 can be a transition fit.

[0097] Optionally, the electromagnetic vibration absorber may further include a plurality of buffer pads 43 .

[0098] like Figure 4 As shown, the buffer pad 43 has an annular structure and is encircled on the shaft structure 41. The buffer pad 43 is located on the side of the first shoulder structure 41a close to the second shoulder structure 41b and is connected to the first shoulder structure 41a. The buffer pad 43 is also located on the side of the second shoulder structure 41b close to the first shoulder structure 41a and is connected to the second shoulder structure 41b.

[0099] An interference fit may be adopted between the buffer pad 43 and the shaft structure 41 .

[0100] The material of the buffer pad 43 may be expanded polystyrene or rubber. The embodiment of the present application does not limit the material of the buffer pad 43 .

[0101] In this way, the shoulder structure will not directly collide with the bearing, which can increase the service life of the bearing.

[0102] Structural feature four: In the mover 4 , the shaft structure 41 may include a first shaft 411 and a second shaft 412 .

[0103] like Figure 4 and Figure 7 As shown, the first shaft body 411 includes a first shaft segment 4111 and a second shaft segment 4112. The diameter of the first shaft segment 4111 is larger than the diameter of the second shaft segment 4112. One end of the first shaft segment 4111 is located within the cylindrical structure of the stator 1 and is slidably connected to the stator 1. The second shaft segment 4112 is located within the cylindrical structure of the stator 1 and is coaxially connected to the first shaft segment 4111. The second shaft body 412 has an axial through hole 412a. The through hole 412a of the second shaft body 412 is encircled by the second shaft segment 4112, and the second shaft body 412 is connected to the second shaft segment 4112. The magnetic body 42 is located between the first shaft segment 4111 and the second shaft body 412 and is connected to the second shaft segment 4112.

[0104] The diameter of the first shaft section 4111 and the outer diameter of the second shaft body 412 may be D1, the diameter of the second shaft section 4112 may be D2, D1 and D2 satisfy the relationship D1 = 3D2, and the inner diameter of the second shaft body 412 may be d4, and d4 = D2.

[0105] In this way, the difficulty of installing the mover 4 can be reduced.

[0106] Structural feature five: the electromagnetic vibration absorber may have a second coil 3. Figure 4 As shown, the second coil 3 is located in the cavity 1a of the stator 1, and the second coil 3 is located on the side of the first coil 2 close to the open end of the stator 1. The second coil 3 is coaxial with the cylindrical structure and is fixedly connected to the stator 1. The second end 42b of the magnetic body 42 is opposite to the second coil 3.

[0107] The first end 42a and the second end 42b of the magnetic body 42 move near the pitch between the first coil 2 and the second coil 3. The pitch between the first coil 2 and the second coil 3 is the distance between the first plane and the second plane, where the first plane is a plane equidistant from the ends of the first coil 2, and the second plane is a plane equidistant from the ends of the second coil 3.

[0108] According to the data simulation results, at the first plane, the force exerted by the first coil 2 on the first end 42a of the magnetic body 42 is the largest, and at the second plane, the force exerted by the second coil 3 on the second end 42b of the magnetic body 42 is the largest. When the first end 42a and the second end 42b of the magnetic body 42 move near the pitch of the first coil 2 and the second coil 3, the acceleration of the mover 4 is the largest and the vibration reduction effect is the best.

[0109] Optionally, the first coil 2 and the second coil 3 can be wound in opposite directions and connected in series. Figure 5 As shown, the first coil 2 and the second coil 3 are connected in series, the end of the first coil 2 away from the second coil 3 is connected to the third wire 2c, and the end of the second coil 3 away from the first coil 2 is connected to the fourth wire 3a.

[0110] According to the right-hand screw rule, when current flows into third wire 2c and out of fourth wire 3a, an S-pole magnetic field is generated on the side of first coil 2 near the open end of base 11, and an N-pole magnetic field is generated on the side of first coil 2 far from the open end of base 11. An N-pole magnetic field is generated on the side of second coil 3 near the open end of base 11, and an S-pole magnetic field is generated on the side of second coil 3 far from the open end of base 11.

[0111] Accordingly, when current flows into fourth wire 3a and out of third wire 2c, an N-pole magnetic field is generated on the side of first coil 2 near the open end of base 11, and an S-pole magnetic field is generated on the side of first coil 2 far from the open end of base 11. An S-pole magnetic field is generated on the side of second coil 3 near the open end of base 11, and an N-pole magnetic field is generated on the side of second coil 3 far from the open end of base 11.

[0112] In this way, when the mover 4 moves in the direction of extending into the stator 1 or in the direction of extending out of the stator 1, the direction of the current flowing through the first coil, the frequency of change of the current direction and the magnitude of the current can be changed according to the vibration frequency and vibration amplitude. Then, the electromagnetic vibration absorber can be adaptively adjusted according to the vibration direction, vibration frequency and vibration amplitude of the mover, thereby improving the vibration reduction effect of the electromagnetic vibration absorber.

[0113] Optionally, the first coil 2 and the second coil 3 can be wound in the same direction and connected in parallel. Figure 6 As shown, the first coil 2 and the second coil 3 are connected in parallel, the two ends of the first coil 2 are connected to the fifth wire 2d and the sixth wire 2e respectively, and the two ends of the second coil 3 are connected to the seventh wire 3b and the eighth wire 3c.

[0114] Similarly, when the current passing through the first coil 2 and the current passing through the second coil 3 are in opposite directions, the magnetic fields generated by the first coil 2 and the second coil 3 can refer to the magnetic fields generated when the first coil 2 and the second coil 3 are wound in opposite directions and connected in series, and will not be repeated here.

[0115] In this way, when the mover 4 moves in the direction of extending into the stator 1 or in the direction of extending out of the stator 1, the direction of the current flowing through the first coil, the frequency of change of the current direction and the magnitude of the current can be changed according to the vibration frequency and vibration amplitude. Then, the electromagnetic vibration absorber can be adaptively adjusted according to the vibration direction, vibration frequency and vibration amplitude of the mover, thereby improving the vibration reduction effect of the electromagnetic vibration absorber.

[0116] In addition, when any one of the first coil 2 or the second coil 3 is disconnected, there is still one coil that can exert a force on the magnetic body 42 in the opposite direction of the movement of the mover 4, which can improve the stability of the electromagnetic vibration absorber.

[0117] Optionally, the pitch length between the first coil 2 and the second coil 3 is a first length H, the axial length of the magnetic body 42 is a second length G, and the first length H and the second length G satisfy the relationship H≤G≤1.3H.

[0118] In this way, the movement of the mover 4 can be made more stable during vibration reduction.

[0119] The electromagnetic vibration damper provided in the embodiment of the present application is used. Since the electromagnetic vibration damping device includes a stator 1, a first coil 2, and a mover 4, the side wall of the stator 1 has a cavity 1a, the first coil 2 is located in the cavity 1a, and the mover 4 includes a shaft structure 41 and a magnetic body 42. One end of the shaft structure 41 is located in the stator 1 and is slidably connected to the stator 1. The magnetic body 42 is connected to the shaft structure 41. The first end 42a of the magnetic body 42 is located in the stator 1 and is opposite to the first coil 2. In this way, after the first coil is energized, a magnetic field is generated at both ends of the first coil. This magnetic field exerts a force on the magnetic body, and vibration reduction is achieved through magnetic force. Therefore, vibration reduction can be achieved without a large friction between the mover and the stator, which can effectively improve the service life of the vibration damper.

[0120] An embodiment of the present application further provides an electromagnetic vibration reduction device, which includes the above-mentioned electromagnetic vibration reducer, a controller, a sensor and at least one external circuit.

[0121] Below, according to several different structures of electromagnetic vibration absorbers, the electromagnetic vibration reduction equipment is introduced respectively:

[0122] 1. When the electromagnetic vibration absorber includes the stator 1, the first coil 2 and the mover 4, the electromagnetic vibration absorption device includes the electromagnetic vibration absorber, a controller, a sensor and an external circuit.

[0123] The mover 4 of the electromagnetic vibration absorber is fixedly connected to the component to be damped.

[0124] The sensor is fixedly connected to the component to be damped and electrically connected to the controller. The sensor is used to detect the vibration direction, amplitude and frequency of the component to be damped and transmit this information to the controller in the form of data.

[0125] The controller is electrically connected to the first coil 2 and the external circuit. The controller is used to receive the vibration direction information, vibration amplitude information, and vibration frequency information of the component to be damped measured by the sensor, and is used to adjust the direction of the current flowing through the first coil 2, the frequency of change of the current direction, and the magnitude of the current based on the above-mentioned vibration direction information, vibration amplitude information, and vibration frequency information, so that:

[0126] (1) When the component to be damped moves in a first direction, current flows from the first end to the second end of the first coil 2. When the component to be damped moves in a second direction, current flows from the second end to the first end of the first coil 2, wherein the first direction is opposite to the second direction.

[0127] (2) The frequency of the change in direction of the current flowing through the first coil 2 is the same as the vibration frequency of the component to be damped.

[0128] (3) When the vibration amplitude of the vibration-damping device exceeds the first preset amplitude, the current flowing through the first coil 2 has a first current intensity. When the vibration amplitude of the vibration-damping device does not exceed the first preset amplitude, the current flowing through the first coil 2 has a second current intensity, wherein the first current intensity is greater than the second current intensity.

[0129] 2. The electromagnetic vibration absorber includes a stator 1, a first coil 2, a third coil 3 and a mover 4, and when the first coil 2 and the second coil 3 are wound in opposite directions and connected in series, the electromagnetic vibration absorption device includes an electromagnetic vibration absorber, a controller, a sensor and an external circuit.

[0130] In the electromagnetic vibration absorber, the first end of the first coil 2 and the second end of the second coil 3 are connected to the external circuit, the second end of the first coil 2 is connected to the first end of the second coil 3, and the mover 4 of the electromagnetic vibration absorber is fixedly connected to the device to be damped.

[0131] The sensor is fixedly connected to the component to be damped and electrically connected to the controller. The sensor is used to detect the vibration direction, amplitude and frequency of the component to be damped and transmit this information to the controller in the form of data.

[0132] The controller is electrically connected to the first coil 2, the second coil 3, and the external circuit. The controller is used to receive vibration direction information, vibration amplitude information, and vibration frequency information of the component to be damped measured by the sensor, and is used to adjust the direction of the current flowing through the first coil 2 and the second coil 3, the frequency of change of the current direction, and the magnitude of the current based on the above vibration direction information, vibration amplitude information, and vibration frequency information, so that:

[0133] (1) When the component to be damped moves in a first direction, current flows from the first end of the first coil 2 to the second end of the second coil 3. When the component to be damped moves in a second direction, current flows from the second end of the second coil 3 to the first end of the first coil 2, wherein the first direction is opposite to the second direction.

[0134] (2) The frequency of the change in direction of the current flowing through the first coil 2 and the second coil 3 is the same as the vibration frequency of the component to be damped.

[0135] (3) When the vibration amplitude of the vibration-damping device exceeds a first preset amplitude, the current flowing through the first coil 2 and the second coil 3 has a first current intensity. When the vibration amplitude of the vibration-damping device does not exceed the first preset amplitude, the current flowing through the first coil 2 and the second coil 3 has a second current intensity, wherein the first current intensity is greater than the second current intensity.

[0136] 3. The electromagnetic vibration absorber includes a stator 1, a first coil 2, a third coil 3 and a mover 4, and when the first coil 2 and the second coil 3 have the same winding direction and are connected in parallel, the electromagnetic vibration absorption device includes an electromagnetic vibration absorber, a controller, a sensor and two external circuits.

[0137] In the electromagnetic vibration absorber, the first coil 2 is connected to the first external circuit, the first coil 2 is connected to the second external circuit, the second end of the first coil 2 is adjacent to the first end of the second coil 3, and the mover 4 of the electromagnetic vibration absorber is fixedly connected to the device to be damped.

[0138] The sensor is fixedly connected to the component to be damped and electrically connected to the controller. The sensor is used to detect the vibration direction, amplitude and frequency of the component to be damped and transmit this information to the controller in the form of data.

[0139] The controller is electrically connected to the first coil 2 and the first external circuit, and the second coil 3 and the second external circuit, respectively. The controller is used to receive vibration direction information, vibration amplitude information, and vibration frequency information of the component to be damped measured by the sensor, and is used to adjust the direction of the current flowing through the first coil 2, the frequency of change of the current direction, and the magnitude of the current based on the above-mentioned vibration direction information, vibration amplitude information, and vibration frequency information, so that:

[0140] (1) When the component to be damped moves in a first direction, current flows from the first end of the first coil 2 to the second end, and simultaneously current flows from the second end of the second coil 3 to the first end of the second coil 3. When the component to be damped moves in a second direction, current flows from the second end of the first coil 2 to the first end, and simultaneously current flows from the first end of the second coil 3 to the second end of the second coil 3, wherein the first direction is opposite to the second direction.

[0141] (2) The frequency of the change in direction of the current flowing through the first coil 2 and the second coil 3 is the same as the vibration frequency of the component to be damped.

[0142] (3) When the vibration amplitude of the vibration-damping device exceeds a first preset amplitude, the current flowing through the first coil 2 and the second coil 3 has a first current intensity. When the vibration amplitude of the vibration-damping device does not exceed the first preset amplitude, the current flowing through the first coil 2 and the second coil 3 has a second current intensity, wherein the first current intensity is greater than the second current intensity.

[0143] An embodiment of the present application also provides a drum washing machine, which includes the above-mentioned electromagnetic vibration reduction device.

[0144] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An electromagnetic vibration absorber, characterized in that: The electromagnetic vibration absorber comprises a stator (1), a first coil (2), a second coil (3) and a mover (4); The stator (1) has a cylindrical structure with one end closed and the other end open, and a side wall of the cylindrical structure has a cavity (1a); The first coil (2) is located in the cavity (1a), the first coil (2) is coaxial with the cylindrical structure, and is connected to the stator (1); The second coil (3) is located in the cavity (1a), the second coil (3) is located on a side of the first coil (2) close to the open end of the stator (1), the second coil (3) is coaxial with the cylindrical structure, and is fixedly connected to the stator (1), and the second coil (3) and the first coil (2) are wound in opposite directions and are connected in series; The mover (4) includes a shaft structure (41) and a magnetic body (42), one end of the shaft structure (41) is located in the cylindrical structure and is slidably connected to the stator (1), the magnetic body (42) is located in the cylindrical structure, the first end (42a) of the magnetic body (42) is opposite to the first coil (2), the second end (42b) of the magnetic body (42) is opposite to the second coil (3), the magnetic body (42) is connected to the shaft structure (41), and the magnetic body (42) moves near the pitch of the first coil (2) and the second coil (3), wherein the pitch is the distance between a first plane and a second plane, the first plane is a plane with equal distances to the two ends of the first coil (2), and the second plane is a plane with equal distances to the two ends of the second coil (3).

2. The electromagnetic vibration absorber according to claim 1, characterized in that: The stator (1) comprises a base (11), a casing (12) and a winding frame (13); The base (11) has a cylindrical structure with one end closed and the other end open; The machine cover (12) has a cylindrical structure with two ends open, and one end of the machine cover (12) is connected to the open end of the base (11); The winding frame (13) has a cylindrical structure with two ends open. The winding frame (13) is located in the machine cover (12) and is connected to the machine cover (12). The cavity (1a) is formed between the winding frame (13) and the machine cover (12). The base (11), the machine cover (12) and the winding frame (13) are coaxial.

3. The electromagnetic vibration absorber according to claim 2, characterized in that: The two ends of the shaft structure (41) respectively have a first shaft shoulder structure (41a) and a second shaft shoulder structure (41b); the diameter of the first shaft shoulder structure (41a) is smaller than the inner diameter of the base (11) and larger than the inner diameter of the winding frame (13); the diameter of the second shaft shoulder structure (41b) is larger than the inner diameter of the opening end of the machine cover (12).

4. The electromagnetic vibration absorber according to claim 2, characterized in that: The stator (1) further comprises a plurality of bearings (14), wherein the plurality of bearings (14) are respectively located in the housing (12) and at both ends of the winding frame (13), the outer rings of the bearings (14) are connected to the housing (12), and the inner rings of the bearings (14) are slidably connected to the shaft structure (41).

5. The electromagnetic vibration absorber according to claim 1, characterized in that: The shaft structure (41) includes a first shaft (411) and a second shaft (412); The first shaft body (411) comprises a first shaft segment (4111) and a second shaft segment (4112), the diameter of the first shaft segment (4111) being larger than the diameter of the second shaft segment (4112), one end of the first shaft segment (4111) being located in the cylindrical structure and being slidably connected to the stator (1), and the second shaft segment (4112) being located in the cylindrical structure and being coaxially connected to the first shaft segment (4111); The second shaft body (412) has an axial through hole (412a), the through hole (412a) of the second shaft body (412) surrounds the second shaft segment (4112), and the second shaft body (412) is connected to the second shaft segment (4112); The magnetic body (42) is located between the first shaft section (4111) and the second shaft body (412), and is connected to the second shaft section (4112).

6. An electromagnetic vibration reduction device, characterized in that: The electromagnetic vibration reduction device comprises the electromagnetic vibration reducer according to any one of claims 1 to 5.

7. A drum washing machine, characterized in that: The drum washing machine includes the electromagnetic vibration reduction device according to claim 6.

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