Vibration reduction device and washing machine

Abstract

The present invention provides a vibration damping device and a washing machine, belonging to the technical field of vibration damping devices. The vibration damping device includes: an outer shell, an accommodating space formed therein; a guide rod, connected to the outer shell and slidable relative to the outer shell, one end of the guide rod being disposed in the accommodating space and the other end passing through the outer shell and disposed outside the accommodating space; a partition, the partition being connected to the guide rod and disposed in the accommodating space, the accommodating space being divided into a plurality of accommodating chambers by the partition; a metal rubber, a group of metal rubbers correspondingly disposed in each accommodating chamber, the metal rubbers being disposed in the accommodating chambers and elastically pressed against the surface of the partition; the metal rubbers being designed such that when the guide rods slide relative to the outer shell, the metal rubbers are always elastically pressed against the end faces of the partitions. The present invention adopts multiple metal rubbers in parallel for vibration damping, thereby achieving both variable damping and variable stiffness vibration damping under tension / compression loads, thereby improving the vibration damping effect of the vibration damping device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration damping devices, and in particular to a vibration damping device and a washing machine. Background Art

[0002] Most existing vibration damping devices use traditional rubber and oil friction to achieve damping energy dissipation. While the vibration damping performance is affected by temperature, the damping oil will also produce a certain amount of volatility, which will contaminate components and change the life and performance of some rubber parts. Summary of the Invention

[0003] In order to overcome the problems existing in the related art, the present invention provides a vibration reduction device and a washing machine.

[0004] A first aspect of the present invention provides a vibration reduction device, comprising:

[0005] An outer shell having an accommodating space formed therein;

[0006] A guide rod is connected to the outer shell and can slide relative to the outer shell, one end of the guide rod is arranged in the accommodating space, and the other end passes through the outer shell and is arranged outside the accommodating space;

[0007] a separator connected to the guide rod and disposed in the accommodating space, wherein the accommodating space is divided into a plurality of accommodating chambers by the separator;

[0008] Metal rubber: each accommodating chamber is provided with a corresponding set of metal rubbers, which are arranged in the accommodating chamber and elastically press against the surface of the partition;

[0009] The metal rubber is designed such that when the guide rod slides relative to the outer shell, the metal rubber always elastically presses against the end surface of the partition.

[0010] In the above technical solution, the partition member includes a partition plate arranged on the outer peripheral wall of the guide rod, the partition plate divides the accommodating space into the first chamber and the second chamber, and the partition plate has a first end surface and a second end surface arranged opposite to each other in the longitudinal direction of the guide rod;

[0011] The metal rubber includes a first metal rubber and a second metal rubber

[0012] The first metal rubber is arranged in the first cavity and elastically presses against the first end surface of the partition plate. The second metal rubber is arranged in the second cavity and elastically presses against the second end surface of the partition plate.

[0013] In the above technical solution, the guide rod includes, in its length direction, a first rod segment located on the first end face side of the partition plate and a second rod segment located on the second end face side of the partition plate;

[0014] The first metal rubber and the second metal rubber are constructed in a ring shape, the first metal rubber is at least partially sleeved around the outer periphery of the first rod segment, and the second metal rubber is sleeved around the outer periphery of the second rod segment;

[0015] The first metal rubber is designed such that when the guide rod slides relative to the outer shell, at least a portion of the first metal rubber is always wrapped around the outer periphery of the first rod segment.

[0016] In the above technical solution, the inner annular surface of the first metal rubber is clearance-matched with the outer wall surface of the first rod segment, and the outer annular surface is clearance-matched with the inner wall surface of the outer shell;

[0017] The inner annular surface of the second metal rubber is clearance-matched with the outer wall surface of the second rod segment, and the inner annular surface is matched with the inner wall surface of the outer shell.

[0018] In the above technical solution, a first limiting structure is provided on the first end surface of the partition plate, and the first limiting structure cooperates with the first metal rubber to limit the radial movement of the first metal rubber;

[0019] A second limiting structure is provided on the second end surface of the partition plate. The second limiting structure cooperates with the second metal rubber to limit the radial movement of the second metal rubber.

[0020] In the above technical solution, the first limiting structure includes a first limiting groove provided on the first end surface of the partition plate, and the second limiting structure includes a second limiting groove provided on the second end surface of the partition plate.

[0021] In the above technical solution, the vibration reduction device further includes:

[0022] A pressing component is provided in each accommodating chamber and presses against the metal rubber surface;

[0023] The pressing force of the pressing component on the metal rubber can be controlled and changed to change the pre-tightening force of the metal rubber.

[0024] In the above technical solution, the pressing assembly is an electromagnetic pressing assembly, which includes an electromagnetic coil and a magnetic block adjacent to each other, and the magnetic block is in contact with the metal rubber.

[0025] The magnetic block can move relative to the electromagnetic coil when the magnetic force of the electromagnetic coil changes, so as to change the pressing force on the metal rubber.

[0026] In the above technical solution, the pressing assembly includes a first pressing assembly and a second pressing assembly;

[0027] The first pressing assembly is disposed in the first chamber and presses against an end of the first metal rubber away from the partition plate;

[0028] The second pressing assembly is disposed in the second chamber and presses against an end of the second metal rubber away from the partition plate;

[0029] The pressing force of the first pressing component on the first metal rubber can be controlled and changed to change the preload force of the first metal rubber, and the pressing force of the second pressing component on the second metal rubber can be controlled and changed to change the preload force of the second metal rubber.

[0030] In the above technical solution, the first pressing assembly and the second pressing assembly are both annular pressing assemblies, and one end of the guide rod disposed in the accommodating chamber passes through the annular opening of the second pressing assembly and is opposite to the annular opening of the first pressing assembly;

[0031] The first pressing component and the second pressing component are clearance-fitted with the outer shell.

[0032] In the above technical solution, the accommodating chamber has an inner bottom wall and an inner top wall opposite to each other in the length direction of the guide rod, wherein;

[0033] The first pressing assembly includes a first electromagnetic coil and a first magnetic block adjacent to each other, the first electromagnetic coil is in contact with the inner bottom wall of the accommodating chamber, and the first magnetic block is in contact with the first metal rubber;

[0034] The second pressing assembly includes a second electromagnetic coil and a second magnetic block which are adjacent to each other. The second electromagnetic coil is in contact with the inner top wall of the accommodating chamber, and the second magnetic block is in contact with the second metal rubber.

[0035] In the above technical solution, the outer shell is provided with a first connecting portion, an end of the outer shell away from the first connecting portion is provided with an opening, and an end of the guide rod away from the first connecting portion passes through the opening and is connected to the second connecting portion;

[0036] A bushing is provided between the guide rod and the opening, and the bushing is interference fit with the outer shell;

[0037] The bushing is a graphene bushing.

[0038] In the above technical solution, the outer shell includes an upper shell and a lower shell, and the upper shell and the lower shell are threadedly connected.

[0039] In the above technical solution, the metal rubber is a meshed filament porous metal rubber.

[0040] A second aspect of the present invention provides a washing machine, which includes the above-mentioned vibration reduction device.

[0041] In the above technical solution, the washing machine includes:

[0042] A box body, wherein an accommodating space is provided inside the box body;

[0043] a washing tub disposed in the accommodating space;

[0044] The vibration damping device is arranged between the box body and the washing tub, and one end of the vibration damping device in the length direction is connected to the box body, and the other end is connected to the washing tub.

[0045] In the above technical solution, the washing machine also includes:

[0046] A controller electrically connected to the first pressing component and the second pressing component;

[0047] The controller can control the pressing force of the first pressing assembly on the first metal rubber according to the vibration amplitude of the washing tub to change the preload of the first metal rubber and / or control the pressing force of the second pressing assembly on the second metal rubber according to the vibration amplitude of the washing tub to change the preload of the second metal rubber.

[0048] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0049] 1. In the embodiment of the present invention, multiple metal rubbers are used in parallel for vibration reduction (because the metal rubbers are always in a compressed state during operation), so variable damping and variable stiffness vibration reduction under tension / compression loads can be achieved, thereby improving the vibration reduction effect of the vibration reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0051] Figure 1 This is a schematic diagram of the main structure of an embodiment of the vibration reduction device of the present invention;

[0052] Figure 2 A side structural diagram of an embodiment of a vibration damping device of the present invention;

[0053] Figure 3 for Figure 2 A schematic cross-sectional view of the AA surface in the embodiment;

[0054] Figure 4 Schematic diagram of the structure of a washing machine embodiment of the present invention;

[0055] Wherein: 1 - second connecting part; 2 - guide rod; 21 - partition plate; 3 - bushing; 4 - upper housing; 5 - second metal rubber; 6 - first metal rubber; 7 - lower housing; 8 - second electromagnetic coil; 9 - second magnetic block; 10 - first magnetic block; 11 - first electromagnetic coil; 12 - housing; 13 - washing drum; 14 - vibration damping device. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention as detailed in the appended claims.

[0057] Most existing vibration damping devices use traditional rubber and oil friction to achieve damping energy dissipation. Furthermore, vibration damping performance is affected by temperature, and the damping oil also evaporates, contaminating components and affecting the lifespan and performance of some rubber parts. The embodiments of the present invention utilize multiple metal rubbers in parallel for vibration reduction (since the metal rubbers are always in a compressed state during operation). This allows for variable damping and stiffness under both tensile and compressive loads, thereby enhancing the device's damping effectiveness.

[0058] The following is combined with Figure 1-4 The technical solution of this embodiment is described in detail. The following implementation methods and embodiments can be combined with each other unless there is any conflict.

[0059] Example

[0060] like Figure 1-Figure 3 As shown, the first aspect of this embodiment provides a vibration reduction device 14, comprising:

[0061] An outer shell having an accommodating space formed therein;

[0062] A guide rod 2 is connected to the outer shell and can slide relative to the outer shell, with one end of the guide rod 2 being disposed in the accommodating space and the other end passing through the outer shell and disposed outside the accommodating space;

[0063] A partition, which is connected to the guide rod 2 and is disposed in the accommodating space. The accommodating space is divided into a plurality of accommodating chambers by the partition 21;

[0064] Metal rubber, each accommodating chamber is provided with a group of metal rubber, which is arranged in the accommodating chamber and elastically presses on the surface of the separator

[0065] The metal rubber is designed such that when the guide rod 2 slides relative to the outer shell, the metal rubber 6 always elastically presses against the end surface of the partition.

[0066] It should be noted that the metal rubber mentioned above is elastically pressed against the end face of the partition, that is, when the metal rubber is placed in the accommodating chamber, the metal rubber is placed in the accommodating chamber in a compressed state, that is, the metal rubber is always in a compressed state when the vibration damping device is working.

[0067] In the embodiments of the present invention, by providing multiple metal rubbers arranged in parallel, they are always in a compressed state during operation. Therefore, they can achieve variable damping and stiffness vibration reduction under both tensile and compressive loads. The stiffness and damping of the vibration reduction device are many times greater than those of a single set of metal rubbers. (If two sets of metal rubbers are provided, and both sets are identical, the overall stiffness and damping of the vibration reduction device are twice that of a single set of metal rubbers.) This enhances the vibration reduction effect of the vibration reduction device. Furthermore, the metal rubbers in the embodiments of the present invention are not only pollution-free, but also more reliable and less susceptible to temperature. Compared to variable damping and stiffness vibration reduction based on magnetorheological fluid principles, they have advantages such as fewer parts, higher reliability, and less sensitivity to ambient temperature. Furthermore, because the metal rubbers are always in a compressed state during operation, the vibration reduction device does not produce any clashing noise between the metal rubbers and other components during operation.

[0068] It should also be noted that each of the aforementioned accommodating chambers is provided with a group of metal rubbers, and the group of metal rubbers here can be either a group of integral metal rubbers or a group of metal rubbers formed by multiple metal rubbers adjacently arranged in the same accommodating chamber.

[0069] The following is an example of setting two groups of metal rubber for specific explanation:

[0070] In any of the above embodiments, Figure 3 As shown, the separator includes a separator plate 21 arranged on the outer peripheral wall of the guide rod 2, the separator plate 21 divides the accommodating space into a first chamber and a second chamber, and the separator plate 21 has a first end surface and a second end surface arranged opposite to each other in the length direction of the guide rod 2;

[0071] The metal rubber includes a first metal rubber 6 and a second metal rubber 5

[0072] The first metal rubber 6 is disposed in the first cavity and elastically presses against the first end surface of the partition plate 21 . The second metal rubber 5 is disposed in the second cavity and elastically presses against the second end surface of the partition plate 21 .

[0073] When the vibration damping device is working, the vibration damping effect of the vibration damping device can be improved due to the vibration damping characteristics of the metal rubber and the parallel arrangement of the two sets of metal rubbers.

[0074] In any of the above embodiments, the guide rod 2 includes, in its length direction, a first rod segment located on the first end surface side of the partition plate 21 and a second rod segment located on the second end surface side of the partition plate 21;

[0075] The first metal rubber 6 and the second metal rubber 5 are constructed in a ring shape. The first metal rubber 6 is at least partially wrapped around the outer periphery of the first rod segment, and the second metal rubber 5 is wrapped around the outer periphery of the second rod segment.

[0076] The first metal rubber 6 is designed such that when the guide rod 2 slides relative to the outer shell, at least a portion of the first metal rubber 6 always surrounds the outer periphery of the first rod segment.

[0077] When the guide rod 2 in the embodiment of the present invention slides relative to the outer shell, that is, during the vibration reduction process of the vibration reduction device, the guide rod 2 is always inserted into the first metal rubber 6, thereby ensuring that the first metal rubber 6 and the second metal rubber 5 are always coaxial, thereby further improving the vibration reduction effect of the vibration reduction device.

[0078] It should be noted that the “ring-shaped” mentioned in the embodiment of the present invention that “the first metal rubber 6 and the second metal rubber 5 are constructed in a ring-shaped manner” does not require them to be completely circular rings. In some alternative embodiments, the first metal rubber 6 and the second metal rubber 5 can also be square rings or polygonal rings.

[0079] It should also be noted that, in some embodiments not shown in the figures, the first metal rubber 6 may also be a non-annular structure, as long as a movement space for the guide rod 2 to move is provided in the first metal rubber 6 .

[0080] However, relatively speaking, it is preferred that both the first metal rubber 6 and the second metal rubber 5 are configured as complete circular rings, which are more convenient to install, and the guide rod 2 has a larger moving distance in the axial direction, and has the best vibration reduction effect.

[0081] In any of the above embodiments, the inner annular surface of the first metal rubber 6 is in clearance fit with the outer wall surface of the first rod segment, and the outer annular surface is in clearance fit with the inner wall surface of the outer shell;

[0082] The inner annular surface of the second metal rubber 5 is clearance-fitted with the outer wall surface of the second rod segment, and the inner annular surface is fitted with the inner wall surface of the outer shell.

[0083] In the embodiment of the present invention, by providing clearance fit between the guide rod 2 and the first metal rubber 6 and the second metal rubber 5, friction between the metal rubber and the guide rod 2 can be avoided, thereby further improving the vibration reduction effect of the metal rubber.

[0084] In any of the aforementioned embodiments, to enhance the stability of the first and second metal rubber members 6 and 5 during use, a first position-limiting structure (not shown) is provided on the first end surface of the partition plate 21. This first position-limiting structure cooperates with the first metal rubber member 6 to limit radial movement of the first metal rubber member 6. A second position-limiting structure (not shown) is provided on the second end surface of the partition plate 21. This second position-limiting structure cooperates with the second metal rubber member 5 to limit radial movement of the second metal rubber member 5. This improves the stability of the first and second metal rubber members 6 and 5 during use.

[0085] Specifically, the first retaining structure includes a first retaining groove provided on the first end surface of the partition plate 21, and the second retaining structure includes a second retaining groove provided on the second end surface of the partition plate 21. When installing the first metal rubber 6, the end of the first metal rubber 6 facing the partition plate 21 is inserted into the first retaining groove, and the end of the second metal rubber 5 facing the partition plate 21 is inserted into the second retaining groove, thereby achieving radial positioning of the first metal rubber 6 and the second metal rubber 5.

[0086] In any of the above embodiments, the vibration reduction device further comprises:

[0087] A pressing component is provided in each accommodating chamber and presses against the metal rubber surface;

[0088] The pressing force of the pressing component on the metal rubber can be controlled and changed to change the pre-tightening force of the metal rubber.

[0089] The vibration damping device in the embodiment of the present invention can vary the top pressure applied to the metal rubber through a top pressure assembly based on the vibration characteristics of the vibrating body, such as a washing machine or an automobile. This changes the preload of the metal rubber, thereby changing the unit volume density of the metal rubber and, consequently, the damping energy dissipation and stiffness of the vibration damping device per unit stroke, thereby achieving variable damping stiffness vibration reduction. For example, when the washing machine's drum vibrates significantly, the preload of the metal rubber can be increased, thereby increasing the unit volume density of the metal rubber and, consequently, increasing the damping and stiffness of the vibration damping device, thereby reducing the drum vibration. When the washing machine's vibration stabilizes at high speed, the top pressure assembly can be used to reduce the preload of the metal rubber, thereby reducing the unit volume density of the metal rubber and, consequently, reducing the stiffness and damping of the isolator, which helps to reduce the transmission of vibration.

[0090] In any of the above embodiments, the pressing assembly is an electromagnetic pressing assembly, which includes an electromagnetic coil and a magnetic block adjacent to each other, and the magnetic block is in contact with the metal rubber;

[0091] The magnetic block can move relative to the electromagnetic coil when the magnetic force of the electromagnetic coil changes, so as to change the pressing force on the metal rubber.

[0092] In the embodiment of the present invention, the preload force of the metal rubber is changed by adjusting the magnetic force of the electromagnetic coil, and the unit volume density of the metal rubber is further changed, thereby changing the damping energy consumption and stiffness within the unit stroke of the vibration reduction device, thereby achieving variable damping stiffness vibration reduction.

[0093] Specifically, as the spin cycle of a drum washing machine begins, the suspension system experiences significant vibration at low rotational speeds, and this vibration becomes more pronounced as the eccentricity increases. In an embodiment of the present invention, electromagnetically controlled metal rubber preload is used to control the unit volume density of the metal rubber, achieving variable damping and stiffness. Testing of metal rubber reveals that increasing unit volume density increases both the equivalent stiffness and damping energy consumption for a given compression. Therefore, when the washing machine in an embodiment of the present invention detects that suspension system vibration exceeds a certain threshold, it rapidly increases the magnetic force generated by the electromagnetic coil, increasing the preload of the metal rubber and, in turn, the unit volume density of the metal rubber. This increases the support stiffness and damping of the suspension system, effectively reducing the vibration. However, as the spin speed continues to increase, the vibration amplitude of the suspension system decreases. At this point, the damping force of a conventional damper increases due to the increasing vibration frequency. The vibration of the suspension system is transmitted to the washing machine housing through the damper, causing acoustic radiation from the washing machine housing, impacting the user experience. In the embodiment of the present invention, the preload of the metal rubber can be reduced as the dehydration speed increases, thereby effectively weakening the stiffness and damping of the vibration reduction device, reducing the vibration transmitted to the box by the suspension system, and effectively reducing the sound radiation generated by the vibration of the box.

[0094] The experiment shows that the vibration reduction effect of a 120N damper is worse than that of a 60N damper when the washing machine is running at high speed. This shows that at high speed, the vibration speed of the suspension system can be reduced by reducing the damping force of the damper (under the same working conditions, the reduction in vibration speed will lead to a reduction in sound radiation).

[0095] In any of the above embodiments, the pressing assembly includes a first pressing assembly and a second pressing assembly;

[0096] The first pressing assembly is disposed in the first chamber and presses against an end of the first metal rubber 6 away from the partition plate 21;

[0097] The second pressing assembly is disposed in the second chamber and presses against the end of the second metal rubber 6 away from the partition plate 21;

[0098] The pressing force of the first pressing component on the first metal rubber 6 can be controlled and changed to change the preload force of the first metal rubber 6 , and the pressing force of the second pressing component on the second metal rubber 5 can be controlled and changed to change the preload force of the second metal rubber 5 .

[0099] The first pressing assembly and the second pressing assembly in the embodiment of the present invention can control the preload force of the first metal rubber 6 and the second metal rubber 5 independently or in conjunction with each other, thereby changing the damping energy consumption and stiffness within the unit stroke of the vibration reduction device, thereby achieving variable damping stiffness vibration reduction.

[0100] In any of the above embodiments, the first pressing assembly and the second pressing assembly are both annular pressing assemblies, and one end of the guide rod 2 disposed in the accommodating chamber passes through the annular opening of the second pressing assembly and is opposite to the annular opening of the first pressing assembly;

[0101] The first pressing component and the second pressing component are clearance-fitted with the outer shell.

[0102] The first pressing assembly and the second pressing assembly in the embodiment of the present invention are configured to be loosely fitted with the outer shell and lubricant is applied to the fitting locations, thereby reducing noise generated by friction between the pressing assembly and the outer shell.

[0103] In any of the above embodiments, the accommodating chamber has an inner bottom wall and an inner top wall opposite to each other in the length direction of the guide rod 2, wherein;

[0104] The first pressing assembly includes a first electromagnetic coil 11 and a first magnetic block 10, the first electromagnetic coil 11 is in contact with the inner bottom wall of the accommodating chamber, and the first magnetic block 10 is in contact with the first metal rubber 6.

[0105] The second pressing assembly includes a second electromagnetic coil 8 and a second magnetic block 9 that are adjacent to each other. The second electromagnetic coil 8 is in contact with the inner top wall of the accommodating chamber, and the second magnetic block 9 is in contact with the second metal rubber 5 .

[0106] When the vibration damping device is in use, it can adjust the current of the electromagnetic coil according to the vibration characteristics of the vibrating body, thereby changing the mutual repulsive force between the electromagnetic coil and the magnetic block, thereby changing the preload force of the metal rubber and further changing the unit volume density of the metal rubber, thereby achieving variable damping stiffness.

[0107] In any of the above embodiments, the outer shell is provided with a first connecting portion, an end of the outer shell away from the first connecting portion is provided with an opening, and an end of the guide rod away from the first connecting portion passes through the opening and is connected to the second connecting portion 1;

[0108] A bushing 3 is provided between the guide rod 2 and the opening, and the bushing is interference fit with the outer shell;

[0109] The bushing 3 is a graphene bushing.

[0110] The graphene bushing in the embodiment of the present invention plays a role of dry friction lubrication and guidance, ensuring the reciprocating motion of the guide rod 2 while avoiding friction with the outer shell to generate large noise.

[0111] In any of the above embodiments, the outer shell includes an upper shell 4 and a lower shell 7, and the upper shell 4 and the lower shell 7 are threadedly connected.

[0112] In the embodiment of the present invention, the outer shell is provided in a split type, which facilitates the disassembly of the vibration device and allows the replacement of damaged components inside the vibration damping device, thereby reducing the user's subsequent maintenance costs for the vibration damping device.

[0113] In any of the above embodiments, the metal rubber mentioned above is a meshed filament porous metal rubber.

[0114] like Figure 4 As shown, the second aspect of this embodiment further proposes a washing machine, which includes the vibration reduction device mentioned above.

[0115] The washing machine in the embodiment of the present invention can improve the vibration reduction effect of the washing machine by using the above-mentioned vibration reduction device. At the same time, the metal rubber preload force can be accurately controlled according to the vibration characteristics of the washing machine, so that the damping and stiffness of the vibration reduction device can be more accurately controlled, thereby further improving the vibration reduction effect of the washing machine.

[0116] Specifically, the mechanical properties of metal rubber indicate that they are less susceptible to temperature than traditional oil dampers. For example, with multiple spin cycles and increasing spin speeds, the damper's temperature rises, further impacting damping performance. The embodiments of the present invention utilize pure metal rubber damping, whose damping and stiffness properties are relatively less affected by temperature and offer more stable vibration damping performance. Due to its nonlinear stiffness and excellent damping performance, metal rubber is an excellent vibration damping material. To reduce vibration and noise in drum washing machines, embodiments of the present invention provide an electromagnetically controlled metal rubber variable stiffness and damping vibration damping device, designed primarily to address the shortcomings of traditional dampers in vibration damping. A drum washing machine suspension system equipped with a traditional damper experiences low-speed resonance during spin operation, with the vibration amplitude increasing as the machine becomes more eccentric. As the spin speed increases, the damper's damping force increases, increasing the vibration velocity transmitted to the cabinet and the acoustic radiation from the cabinet. After installing the vibration damping device according to the embodiment of the present invention, when the amplitude of the low-speed resonance range of the drum washing machine suspension system exceeds a certain threshold during the dehydration operation, the electronic control system controls the magnetic force of the electromagnetic coil, thereby controlling the compression of the metal rubber and, in turn, the unit volume density of the metal rubber, thereby controlling the damping and stiffness of the vibration damping device. At this time, as the amplitude of the low-speed resonance range exceeds a certain threshold, the magnetic force of the electromagnetic coil is increased, thereby increasing the unit volume density of the metal rubber, increasing the stiffness and damping of the vibration damping device, and thereby reducing the amplitude of the suspension system to prevent drum collision. As the speed increases, the vibration damping device according to the embodiment of the present invention can reduce the unit volume density of the metal rubber, thereby reducing the damping and stiffness, which helps to reduce the amplitude of the vibration velocity transmitted to the cabinet and, in turn, the acoustic radiation of the cabinet.

[0117] In any of the above embodiments, Figure 4 As shown, the washing machine includes:

[0118] The box body 12 has an accommodating space therein;

[0119] A washing tub 13 is disposed in the accommodating space;

[0120] The vibration damping device 14 is provided between the housing 12 and the washing tub 13 , with one end of the vibration damping device 14 connected to the housing 12 and the other end connected to the washing tub 13 in the length direction.

[0121] Specifically, when installing the vibration damping device 14 , the first connecting portion of the vibration damping device 14 is connected to the housing 12 , and the second connecting portion of the vibration damping device 14 is connected to the washing tub 13 .

[0122] In any of the above embodiments, the washing machine further comprises:

[0123] A controller electrically connected to the first pressing component and the second pressing component;

[0124] The controller can control the pressing force of the first pressing assembly on the first metal rubber 6 according to the vibration amplitude of the washing tub 13 to change the preload force of the first metal rubber 6 and / or control the pressing force of the second pressing assembly on the second metal rubber 5 according to the vibration amplitude of the washing tub 13 to change the preload force of the second metal rubber 5.

[0125] In any of the above embodiments, the washing machine is a drum-type washing machine, and multiple groups of vibration damping devices 14 are provided. The multiple groups of vibration damping devices 14 are evenly distributed at the bottom of the washing tub 13 .

[0126] The following is a complete description of the vibration damping device 14 in the embodiment of the present invention, taking a washing machine as an example:

[0127] Before describing the vibration reduction device in the embodiment of the present invention, a brief introduction to the vibration reduction device in the prior art is given:

[0128] Existing washing machine vibration damping devices often use traditional rubber and oil friction to achieve energy damping. However, the damping performance of traditional rubber materials is relatively poorly stable due to factors such as oil smoke and temperature. The damping performance of oil friction is also significantly affected by environmental factors, and leakage can easily pollute the surrounding environment. Existing variable damping and variable stiffness vibration damping devices for washing machines often rely on magnetorheological fluids, which can precipitate or oxidize over time and are prone to failure or damage in high-temperature and high-pressure environments.

[0129] In contrast, the vibration damping device in the embodiment of the present invention uses a meshed metal rubber as its core vibration damping component. This not only offers advantages such as high damping, high temperature resistance, and long life, but also reduces the number of components used. Using electromagnetic coils to control the metal rubber preload allows for more precise control of the damping and stiffness of the vibration damping device.

[0130] Specifically, the vibration damping device in this embodiment of the present invention has its second connection portion connected to the washing machine's drum, while its first connection portion is connected to the guide rod 2 using a fine-pitch thread. Due to the presence of the graphene bushing 3, the guide rod 2 undergoes linear reciprocating motion. The second metal rubber 5 and the first metal rubber 6 remain in a compressed state throughout the vibration damping process. Furthermore, during this process, the guide rod 2 remains inserted into the first metal rubber 6. To ensure the coaxiality of the first and second metal rubbers 5 and 6, the upper and lower housings 4 and 7 are connected using fine-pitch threads. The lower housing 7 is connected to the washing machine housing. A gap exists between the guide rod 2 and the second and first metal rubbers 5 and 6. The second electromagnetic coil 8, second magnetic block 9, first magnetic block 11, and first electromagnetic coil 11 all have a clearance fit with the upper and lower housings 4 and 7. Because the metal rubbers remain compressed throughout the vibration damping process, no component clashing noise is produced.

[0131] The assembly process of the vibration damping device in the embodiment of the present invention is as follows: First, the first electromagnetic coil 11, the first magnetic block 10, and the first metal rubber 6 are sequentially placed into the lower housing 7. The wires of the first electromagnetic coil 11 are passed through the hole in the lower housing 7. Next, the unthreaded end of the guide rod 2 is inserted into the first metal rubber 6, ensuring that the guide rod 2 continuously slides within the first metal rubber 6. Finally, the second metal rubber 5, the second magnetic block 9, and the second electromagnetic coil 8 are sequentially inserted through one end of the threaded hole in the guide rod 2. The graphene bushing 3 and the upper housing 4 are fitted with an interference fit. Once the graphene bushing 3 and the upper housing 4 are fully fitted, they are inserted through one end of the threaded hole in the guide rod 2. Using a wrench, the upper and lower housings 4 and 7 are connected using fine-threaded connections. The wires of the second electromagnetic coil 8 are passed through the hole in the upper housing 4. Finally, the second connecting portion is connected to the guide rod 2 using fine-threaded connections. Because the metal rubber of the vibration damping device is constantly under pressure during the vibration damping process, the upper and lower housings 4 and 7 of the vibration damping device are constantly subject to preload.

[0132] The vibration reduction principle of the vibration reduction device is: according to the vibration characteristics of the washing machine washing drum, the current of the electromagnetic coil is adjusted, thereby changing the mutual repulsive force between the electromagnetic coil and the magnetic block, thereby changing the preload force of the metal rubber and further changing the unit volume density of the metal rubber to achieve variable damping stiffness.

[0133] Specifically, when the washing drum vibrates significantly, the preload can be increased to increase the unit volume density of the metal rubber, thereby increasing the damping and stiffness of the vibration reduction device and reducing drum vibration. When the drum washing machine's vibration stabilizes at high speed, the preload can be reduced, reducing the unit volume density of the metal rubber and, in turn, the stiffness and damping of the vibration isolator, thereby reducing vibration transmission.

[0134] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0135] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A vibration damping device, characterized in that: The vibration damping device (14) comprises: An outer shell having an accommodating space formed therein; A guide rod (2) is slidable relative to the outer shell, one end of the guide rod (2) is arranged in the accommodating space, and the other end passes through the outer shell and is arranged outside the accommodating space; a partition, the partition being connected to the guide rod (2) and arranged in the accommodating space, the accommodating space being divided into a plurality of accommodating chambers by the partition; Metal rubbers, each of the accommodating chambers correspondingly being provided with a group of the metal rubbers, the metal rubbers being arranged in the accommodating chambers and elastically pressing against the surface of the partition; The metal rubber is designed such that when the guide rod (2) slides relative to the outer shell, the metal rubber (6) always elastically presses against the surface of the partition; The partition member comprises a partition plate (21) arranged on the outer peripheral wall of the guide rod (2), the partition plate (21) divides the accommodating space into a first chamber and a second chamber, and the partition plate (21) has a first end surface and a second end surface arranged opposite to each other in the longitudinal direction of the guide rod (2); The metal rubber comprises a first metal rubber (6) and a second metal rubber (5); The first metal rubber (6) is arranged in the first chamber and elastically presses against the first end surface of the partition plate (21); the second metal rubber (5) is arranged in the second chamber and elastically presses against the second end surface of the partition plate (21); The vibration reduction device further comprises: A pressing assembly, the pressing assembly comprising a first pressing assembly and a second pressing assembly; The first pressing component is arranged in the first chamber and presses against an end of the first metal rubber (6) away from the partition plate (21); The second pressing component is arranged in the second chamber and presses against an end of the second metal rubber (5) away from the partition plate (21); The pressing force of the first pressing component on the first metal rubber (6) can be controlled and changed to change the preload force of the first metal rubber (6), and the pressing force of the second pressing component on the second metal rubber (5) can be controlled and changed to change the preload force of the second metal rubber (5).

2. The vibration damping device according to claim 1, characterized in that: The guide rod (2) comprises, in its length direction, a first rod section located on the first end face side of the partition plate (21) and a second rod section located on the second end face side of the partition plate (21); The first metal rubber (6) and the second metal rubber (5) are constructed in an annular shape, the first metal rubber (6) is at least partially encircled around the outer periphery of the first rod segment, and the second metal rubber (5) is encircled around the outer periphery of the second rod segment; The first metal rubber (6) is designed such that when the guide rod (2) slides relative to the outer shell, at least a portion of the first metal rubber (6) is always encircled around the outer periphery of the first rod segment.

3. The vibration damping device according to claim 2, characterized in that: The inner annular surface of the first metal rubber (6) is in clearance fit with the outer wall surface of the first rod segment, and the outer annular surface is in clearance fit with the inner wall surface of the outer shell; The inner annular surface of the second metal rubber (5) is clearance-matched with the outer wall surface of the second rod segment, and the outer annular surface is matched with the inner wall surface of the outer shell.

4. The vibration damping device according to claim 1, characterized in that: A first limiting structure is provided on the first end surface of the partition plate (21), and the first limiting structure cooperates with the first metal rubber (6) to limit radial movement of the first metal rubber (6); A second limiting structure is provided on the second end surface of the partition plate (21), and the second limiting structure cooperates with the second metal rubber (5) to limit radial movement of the second metal rubber (5).

5. The vibration damping device according to claim 4, characterized in that: The first limiting structure comprises a first limiting groove provided on a first end surface of the partition plate (21), and the second limiting structure comprises a second limiting groove provided on a second end surface of the partition plate (21).

6. The vibration damping device according to claim 1, characterized in that: The pressing assembly is an electromagnetic pressing assembly, which includes an electromagnetic coil and a magnetic block adjacently arranged along the axial direction of the guide rod, and the magnetic block is in contact with the metal rubber; The magnetic block can move relative to the electromagnetic coil when the magnetic force of the electromagnetic coil changes, so as to change the pressing force on the metal rubber.

7. The vibration damping device according to claim 1, characterized in that: The first pressing assembly and the second pressing assembly are both annular pressing assemblies, and one end of the guide rod (2) disposed in the accommodating chamber passes through the annular opening of the second pressing assembly and is opposite to the annular opening of the first pressing assembly; The first pressing component and the second pressing component are clearance-fitted with the outer shell.

8. The vibration damping device according to claim 6, characterized in that: The accommodating chamber has an inner bottom wall and an inner top wall opposite to each other in the length direction of the guide rod (2), wherein; The first pressing component includes a first electromagnetic coil (11) and a first magnetic block (10) arranged adjacent to each other, the first electromagnetic coil (11) is in contact with the inner bottom wall of the accommodating chamber, and the first magnetic block (10) is in contact with the first metal rubber (6); The second pressing component includes a second electromagnetic coil (8) and a second magnetic block (9) arranged adjacent to each other. The second electromagnetic coil (8) is in contact with the inner top wall of the accommodating chamber, and the second magnetic block (9) is in contact with the second metal rubber (5).

9. The vibration damping device according to claim 1, characterized in that: The outer shell is provided with a first connecting portion, an end of the outer shell away from the first connecting portion is provided with an opening, and an end of the guide rod away from the first connecting portion passes through the opening and is connected to the second connecting portion (1); A bushing (3) is provided between the guide rod (2) and the opening, and the bushing is interference-fitted with the outer shell; The bushing (3) is a graphene bushing.

10. The vibration damping device according to claim 1, wherein: The outer shell comprises an upper shell (4) and a lower shell (7), and the upper shell (4) and the lower shell (7) are threadedly connected.

11. The vibration damping device according to claim 1, characterized in that: The metal rubber is a porous metal rubber made of braided filaments.

12. A washing machine, characterized in that: The vibration damping device comprises the vibration damping device according to any one of claims 1 to 11.

13. The washing machine according to claim 12, wherein: The washing machine comprises: A box body (12) having an accommodating space therein; A washing drum (13) is arranged in the accommodating space; The vibration damping device (14) is provided between the box body (12) and the washing tub (13), and one end of the vibration damping device (14) in the length direction is connected to the box body (12), and the other end is connected to the washing tub (13).

14. The washing machine according to claim 13, wherein The washing machine also includes: Controller; A pressing component, wherein at least one of the accommodating chambers is provided with a corresponding set of pressing components and the pressing components press against the surface of the metal rubber; The pressing force of the pressing component on the metal rubber can be controlled to change so as to change the pre-tightening force of the metal rubber; The pressing assembly includes a first pressing assembly and a second pressing assembly, and the controller is electrically connected to the first pressing assembly and the second pressing assembly; The controller can control the pressing force of the first pressing component on the first metal rubber (6) according to the vibration amplitude of the washing tub (13) to change the preload force of the first metal rubber (6) and / or control the pressing force of the second pressing component on the second metal rubber (5) according to the vibration amplitude of the washing tub (13) to change the preload force of the second metal rubber (5).

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