A low-noise damper and a drum washing machine having the same

Abstract

The utility model discloses a low noise damper and drum washing machine with it. The low noise damper includes piston rod, the noise reduction support pipe of setting in the piston rod outside and the damping sheet in the noise reduction support pipe, one end of piston rod is inserted into the noise reduction support pipe and can move along its axial movement, the damping sheet provides damping force in the piston rod movement process, the inner wall of noise reduction support pipe is equipped with a plurality of guide convex parts and a plurality of stop convex parts at intervals, the first gap is formed between the outer surface of piston rod and guide convex part, the second gap is formed between the outer surface of piston rod and stop convex part, wherein, the first gap is less than the second gap and the rigidity of guide convex part is less than the rigidity of stop convex part. The utility model provides a kind of damper and drum washing machine with it, which can keep stable under complex working conditions, low noise operation and longer service life.

Description

Technical Field

[0001] This utility model relates to the field of vibration reduction technology, and in particular to a low-noise vibration damper and a drum washing machine having the same. Background Technology

[0002] During the high-speed rotation of a drum washing machine, including spin-drying and rinsing, significant unbalanced forces are generated within the inner drum and its contents, causing overall machine vibration. To suppress vibration and improve user experience, a vibration damping system is typically installed between the washing machine's cabinet and outer tub. Currently, the mainstream vibration damping solution is to install a friction damper under the outer tub. This type of damper usually includes a support tube and a piston rod, both connected to the cabinet and outer tub respectively. The piston rod extends into the support tube, and sliding friction damping force is generated between the two through damping plates assembled within the support tube, thereby dissipating vibration energy.

[0003] However, existing friction-type vibration dampers face a common and difficult-to-resolve technical contradiction in practical applications. To ensure smooth sliding of the piston rod within the support tube, an assembly gap must be maintained between the two. If the gap is too large, when the washing machine experiences severe load swaying and instantaneous large off-center loads, abnormal radial wobble and angular displacement may occur between the piston rod and the support tube, leading to unexpected hard collisions between components, producing a harsh impact noise, and potentially accelerating component wear. Conversely, if the gap is too small, although it can improve the swaying problem, under the normal vibration of the washing machine during normal operation, the slight deflection of the outer tub will force the piston rod to frequently contact the inner wall of the support tube, generating additional sliding friction. This not only interferes with the axial damping force preset by the damping plate, leading to unstable damping performance, but also significantly shortens the service life of the vibration damper due to continuous abnormal friction.

[0004] Therefore, conventional designs are difficult to accommodate the vibration damper performance requirements of washing machines under different operating conditions. Based on this, it is necessary to propose a technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0005] This invention provides a vibration damper that can maintain stable, low-noise operation and longer lifespan under complex working conditions, and a drum washing machine having the same.

[0006] This utility model is achieved through the following technical solution: a low-noise vibration damper, comprising a piston rod, a noise-reducing support tube sleeved outside the piston rod, and a damping plate located inside the noise-reducing support tube. One end of the piston rod extends into the noise-reducing support tube and can move along its axial direction. The damping plate provides damping force during the movement of the piston rod. A plurality of guide protrusions and a plurality of stop protrusions are spaced apart on the inner wall of the noise-reducing support tube. A first gap is formed between the guide protrusions and the outer surface of the piston rod, and a second gap is formed between the stop protrusions and the outer surface of the piston rod. The first gap is smaller than the second gap, and the stiffness of the guide protrusions is smaller than the stiffness of the stop protrusions.

[0007] As a further improved technical solution, the number of guide protrusions is greater than the number of stop protrusions.

[0008] As a further improved technical solution, the guide protrusion is a guide rib, the stop protrusion is a stop rib, and the width of the guide rib is smaller than the width of the stop rib.

[0009] As a further improved technical solution, the end face of the guide protrusion is an arc-shaped concave surface that corresponds to and matches the outer surface contour of the piston rod.

[0010] As a further improved technical solution, the end face of the stop protrusion includes an arc-shaped protrusion that protrudes toward the surface of the piston rod.

[0011] As a further improved technical solution, the inner wall of the noise reduction support tube is also provided with a plurality of limiting protrusions, and a third gap is formed between the limiting protrusions and the outer surface of the piston rod, the third gap being larger than the second gap.

[0012] As a further improved technical solution, the plurality of stop protrusions and the plurality of limiting protrusions all extend radially along the noise reduction support tube.

[0013] As a further improved technical solution, the low-noise vibration damper includes a damping cap fixed to the opening of the noise reduction support tube to abut against the damping plate; and / or, the inner surface of the damping plate is provided with lubricating grease; and / or, both the noise reduction support tube and the piston rod are provided with connecting holes, and flexible washers are provided in the connecting holes.

[0014] This utility model is also achieved through the following technical solution: a drum washing machine, including an outer tub and a cabinet, the drum washing machine including the low noise vibration damper as described above, the low noise vibration damper being connected between the lower part of the outer tub and the cabinet to support the outer tub, the drum washing machine also including a suspension rod assembly connected between the upper part of the outer tub and the cabinet to suspend the outer tub.

[0015] The low-noise vibration damper provided by this utility model has multiple guide protrusions and multiple stop protrusions spaced apart on the inner wall of its noise-reducing support tube. A first gap is formed between the guide protrusions and the outer surface of the piston rod, and a second gap is formed between the stop protrusions and the outer surface of the piston rod. The first gap is smaller than the second gap, and the stiffness of the guide protrusions is smaller than that of the stop protrusions. When the piston rod experiences a slight off-center load, the guide protrusions can contact the piston rod to provide auxiliary guidance. Due to the low stiffness of the guide protrusions, they can eliminate the offset between the piston rod and the noise-reducing support tube through their own deformation, thus playing a role in correcting the direction of the load. When a larger off-center load occurs, the piston rod will further contact the stop protrusions. Due to the high stiffness of the stop protrusions, they provide auxiliary support and prevent further off-center load on the piston rod. Through the cooperation of the guide protrusions and the stop protrusions, the off-center load on the piston rod can be reduced, avoiding additional friction and damping forces, enabling the vibration damper to maintain stable and low-noise operation under complex working conditions and have a longer service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only schematic representations of some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view along the axial direction of an embodiment of the low-noise vibration damper of this utility model.

[0018] Figure 2 This is a radial cross-sectional view of an embodiment of the low-noise vibration damper of this utility model.

[0019] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 yes Figure 2 A magnified view of a section at point B.

[0021] Figure 5 yes Figure 2 A magnified view of a section at point C.

[0022] Figure 6 This is a schematic diagram of the low-noise vibration damper of this utility model applied to a drum washing machine.

[0023] The attached figures are labeled as follows: 100, vibration damper; 1, noise reduction support tube; 11, connecting hole one; 12, flexible washer one; 13, guide protrusion; 14, stop protrusion; 15, limiting protrusion; 2, piston rod; 21, connecting hole two; 22, flexible washer two; 3, damping plate; 4, damping cap; 101, outer barrel; 102, housing; 103, hanger assembly; D1, first gap; D2, second gap; D3, third gap. Detailed Implementation

[0024] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1 to 5 As shown, this utility model provides a low-noise vibration damper 100, including a piston rod 2, a noise-reducing support tube 1 sleeved outside the piston rod 2, and a damping plate 3 located inside the noise-reducing support tube 1. One end of the piston rod 2 extends into the noise-reducing support tube 1 and can move along its axial direction. The damping plate 3 provides damping force during the movement of the piston rod 2. A plurality of guide protrusions 13 and a plurality of stop protrusions 14 are spaced apart on the inner wall of the noise-reducing support tube 1. A first gap D1 is formed between the guide protrusions 13 and the outer surface of the piston rod 2, and a second gap D2 is formed between the stop protrusions 14 and the outer surface of the piston rod 2. The first gap D1 is smaller than the second gap D2, and the stiffness of the guide protrusions 13 is smaller than the stiffness of the stop protrusions 14.

[0027] The low-noise vibration damper 100 provided by this utility model allows the guide protrusion 13 to contact the piston rod 2 for auxiliary guiding when the piston rod 2 experiences slight off-center loading. Due to the low stiffness of the guide protrusion 13, it can eliminate the offset between the piston rod 2 and the noise reduction support tube 1 through its own deformation, thus playing a role in correcting the guidance. When a larger off-center loading occurs, the piston rod 2 will further contact the stop protrusion 14. Due to the high stiffness of the stop protrusion 14, it plays an auxiliary supporting role, preventing the piston rod 2 from further off-center loading. Through the cooperation of the guide protrusion 13 and the stop protrusion 14, the off-center loading of the piston rod 2 can be reduced, avoiding the generation of additional friction and damping force, enabling the vibration damper 100 to maintain stable and low-noise operation under complex working conditions and have a longer service life.

[0028] Please see Figure 1 This utility model provides a low-noise vibration damper 100, comprising a piston rod 2, a noise-reducing support tube 1, a damping plate 3, and a damping cap 4. The noise-reducing support tube 1 is sleeved outside the piston rod 2, with one end of the piston rod 2 extending into the inner cavity of the noise-reducing support tube 1 and capable of axial movement along the noise-reducing support tube 1. The damping plate 3 is disposed within the inner cavity of the noise-reducing support tube 1 and sleeved outside the piston rod 2. The damping cap 4 is fixed to the opening of the noise-reducing support tube 1 to abut against the damping plate 3. When the piston rod 2 moves axially relative to the noise-reducing support tube 1, sliding friction occurs between the damping plate 3 and the outer surface of the piston rod 2, thereby providing a stable damping force for the movement of the piston rod 2 and consuming vibration energy. To facilitate the installation of the vibration damper 100 on the washing machine, the end of the noise-reducing support tube 1 away from the piston rod 2 has a connection hole 11, and the end of the piston rod 2 extending out of the noise-reducing support tube 1 has a connection hole 21, which are used to connect to the outer tub 101 and the casing 102 of the washing machine, respectively. To further isolate vibration and noise, a flexible washer 12 can be installed in the connection hole 11, and a flexible washer 22 can be installed in the connection hole 21. These flexible washers can be made of elastic materials such as rubber, which can effectively absorb and isolate high-frequency micro-vibrations and structural noise transmitted from the connectors.

[0029] Please see Figures 2 to 5 As shown, multiple guide protrusions 13 and multiple stop protrusions 14 are spaced circumferentially on the inner wall of the noise reduction support tube 1. These protrusions extend from the inner wall of the noise reduction support tube 1 into the internal space of the noise reduction support tube 1, and are used to constrain and guide the piston rod 2 radially to prevent it from undergoing excessive radial displacement. Specifically, as... Figure 3 As shown, a first gap D1 is formed between the inner surface of the guide protrusion 13 and the outer surface of the piston rod 2, while a second gap D2 is formed between the inner surface of the stop protrusion 14 and the outer surface of the piston rod 2. Figure 4 As shown. The first gap D1 is smaller than the second gap D2, which means that under normal conditions, the radial offset of the piston rod 2 is constrained by the guide protrusion 13 more initially. More importantly, the stiffness of the guide protrusion 13 is designed to be less than that of the stop protrusion 14. Stiffness refers to the ability of a material or structure to resist elastic deformation, and the low stiffness of the guide protrusion 13 makes it more prone to elastic deformation under stress. This smaller gap and lower stiffness of the guide protrusion 13, in synergy with the larger gap and higher stiffness of the stop protrusion 14, cleverly resolves the gap design contradictions described in the background art.

[0030] During use, under relatively stable vibration conditions, the radial off-center load on the piston rod 2 of the damper 100 is small. At this time, any slight radial displacement that the piston rod 2 may experience is first limited by the first gap D1, meaning the outer surface of the piston rod 2 will approach or slightly contact the guide protrusion 13. Because the guide protrusion 13 has low stiffness and good elastic deformation capability, when subjected to the contact pressure of the piston rod 2, it will not produce a hard impact or strong sliding friction like a rigid structure, but can absorb and buffer the contact force through its own elastic deformation. This flexible contact mechanism, on the one hand, avoids the generation of additional, uncontrollable frictional damping force due to slight contact, ensuring that the main axial damping force of the damper 100 is provided only by the designed damping plate 3, thereby guaranteeing the stability and consistency of the damping performance and reducing additional damping force and frictional noise; on the other hand, the deformation of the guide protrusion 13 itself also provides a moderate restoring force, assisting the piston rod 2 in maintaining its centered position, thus playing a good dynamic guiding role.

[0031] When operating under conditions of significant off-center loading, the first clearance D1 may be completely overcome, and the piston rod 2 will move further outward. At this point, the larger second clearance D2 provides additional displacement space, and the piston rod 2 may eventually contact the stop protrusion 14. Since the stiffness of the stop protrusion 14 is much greater than that of the guide protrusion 13, its deformation capacity is very weak, primarily serving as a rigid support. The presence of the stop protrusion 14 prevents the piston rod 2 from undergoing uncontrolled displacement under significant off-center loading.

[0032] In this embodiment, the guide protrusion 13 is a guide rib, and the stop protrusion 14 is a stop rib. The rib structure extends parallel to the axial direction, and the width of the guide rib is smaller than the width of the stop rib. The width of the guide rib is designed to be smaller than the width of the stop rib. The narrower width makes the guide rib more prone to bending deformation under radial force, thereby achieving its low stiffness characteristics and enhancing its flexible buffering effect. The wider stop rib, on the other hand, can provide a stronger bending section modulus, which matches its required high stiffness and auxiliary support functions, ensuring structural reliability when subjected to large eccentric impact loads.

[0033] Please continue reading. Figure 2As shown, in this embodiment, the number of guide protrusions 13 is greater than the number of stop protrusions 14. Increasing the number of guide protrusions 13 provides more and more uniform flexible support points for the piston rod 2 in the circumferential direction, enabling it to obtain timely and gentle guidance and buffering when subjected to eccentric forces from different directions. This further improves the stability and smoothness of the vibration damper 100 under complex vibration conditions, while dispersing potential frictional noise to more contact points, reducing the load and abnormal noise risk of single-point contact. An appropriate number of stop protrusions 14 ensures sufficient rigid limiting support in critical positions. In this embodiment, eight guide protrusions 13 and two stop protrusions 14 are provided on the inner wall of the noise reduction support tube 1; of course, in other embodiments, the specific number is not limited to this.

[0034] like Figure 3 As shown, in this embodiment, the end face of the guide protrusion 13 is an arc-shaped concave surface that corresponds to and matches the outer surface contour of the piston rod 2. The end face of the guide protrusion 13, that is, the surface opposite to the piston rod 2, is set as an arc-shaped concave surface that corresponds to and matches the outer surface contour of the piston rod 2. For example, when the piston rod 2 is cylindrical, this end face is an inwardly concave arc surface. This design of matching surfaces makes the contact between the piston rod 2 and the guide protrusion 13 more stable, and also makes the elastic return force provided to the piston rod 2 when the guide protrusion 13 deforms tend to be centered. Furthermore, the protrusion lengths of the multiple guide protrusions 13 are designed to be different from each other, and the protrusion directions of the multiple guide protrusions 13 remain parallel to each other. This arrangement makes it so that the guide protrusions 13 do not all protrude radially, so that the force applied to the guide protrusion 13 by the piston rod 2 is a force that causes the guide protrusion 13 to bend and deform, rather than a radial force along its protrusion direction, thus ensuring the elastic deformation capability of the guide protrusion 13. The protruding direction of the stop protrusion 14 is set to be along the radial direction of the noise reduction support tube 1. In other embodiments, the protruding directions of the plurality of guide protrusions 13 may not be arranged parallel to each other, and the protruding directions of some of the guide protrusions 13 may be offset to a certain extent relative to the radial direction.

[0035] like Figure 4As shown, the end face of the stop protrusion 14 includes an arc-shaped protrusion protruding towards the surface of the piston rod 2. The arc-shaped protrusion reduces the contact area with the piston rod 2, decreasing the additional damping force generated during abnormal contact. The end face of the stop protrusion 14 may include one or more arc-shaped protrusions protruding towards the surface of the piston rod 2. When the piston rod 2 contacts this stop protrusion 14 under a large off-center load, this arc-shaped protrusion forms an approximately line contact or a very small area contact with the cylindrical surface of the piston rod 2. This design achieves a rigid limiting function while intentionally reducing the contact area, thereby minimizing the increase in additional damping force and frictional noise that may be caused by this contact, ensuring that the vibration damper's mechanical performance is not unexpectedly disturbed.

[0036] like Figure 5 As shown, to provide final limiting protection, multiple limiting protrusions 15 can be provided on the inner wall of the noise reduction support tube 1. A third gap D3 is formed between the limiting protrusions 15 and the outer surface of the piston rod 2, and the third gap D3 is larger than the second gap D2. These three gaps constitute a three-level radial constraint system from smallest to largest: first gap D1 (guide gap) < second gap D2 (stop gap) < third gap D3 (safety limiting gap). The function of the limiting protrusions 15 is to provide a final rigid limit for the piston rod 2 in extremely rare cases, such as when the stop protrusion 14 fails or when subjected to a huge impact far exceeding the design range, preventing its displacement from completely spiraling out of control and causing overall structural damage to the damper 100. This design greatly improves the reliability and durability of the product, avoiding the piston rod 2 from impacting the wall of the noise reduction support tube 1 or abnormally interfering with other components such as the damping cap 4 due to excessive instantaneous off-center load. Such abnormal interference is the main cause of severe impact noise and mechanical damage. The rigid limiting protrusion 15 acts like a safety barrier, restricting the maximum displacement of the piston rod 2 within a safe range. This effectively prevents hard impacts inside the damper 100, protects the components from damage, and eliminates the resulting impact noise. Both the plurality of stop protrusions 14 and the plurality of limiting protrusions 15 are configured to extend radially along the noise-reducing support tube 1. This radially extending structure allows it to most effectively guide the radial impact force transmitted from the piston rod 2 directly to the wall of the noise-reducing support tube 1, resulting in a clear mechanical transmission path, high structural strength, and reliable limiting effect.

[0037] Please refer to it again. Figure 1As shown, in this embodiment, the low-noise vibration damper 100 includes a damping cap 4 fixed to the opening of the noise-reducing support tube 1. The damping cap 4 can be fixed by means of clips, threads, or riveting. Its main function is to axially press against the damping plate 3, stably constraining it in the working position and preventing it from moving due to vibration and generating noise. The fixed connection between the damping cap 4 and the noise-reducing support tube 1 should be tight and secure to avoid generating additional vibration noise. Furthermore, lubricating grease can be coated or impregnated on the inner surface of the damping plate 3, i.e., the working surface in contact with the piston rod 2. The lubricating grease can form an oil film between the damping plate 3 and the piston rod 2. This oil film can ensure the stability of sliding friction damping, eliminate the "hissing" sound or vibration that may be generated by dry friction, make the movement of the piston rod 2 smoother and quieter, and also reduce the wear of the damping plate 3, extending its service life. Both the noise-reducing support tube 1 and the piston rod 2 have connecting holes at their ends, and flexible washers are installed in the connecting holes. Specifically, the end of the noise-reducing support tube 1 has a first connecting hole 11 with a first flexible washer 12 installed therein, and the end of the piston rod 2 has a second connecting hole 21 with a second flexible washer 22 installed therein. The flexible washers can buffer the components connected in the connecting holes to reduce noise generated by friction or impact.

[0038] Please see Figure 6 As shown, this utility model also provides a drum washing machine, including an outer tub 101 and a housing 102. The drum washing machine includes a low-noise vibration damper 100 as described above. The low-noise vibration damper 100 is connected between the lower part of the outer tub 101 and the housing 102 to support the outer tub 101. The drum washing machine also includes a suspension rod assembly 103 connected between the upper part of the outer tub 101 and the housing 102 to suspend the outer tub 101. Specifically, the drum washing machine includes an outer tub 101, a housing 102, and a vibration damping system connected between the two. The vibration damping system includes a suspension rod assembly 103 located above the outer tub 101 for suspending, and a vibration damper 100 located below the outer tub 101 for support. The drum washing machine uses the vibration damper 100 as described in any of the above embodiments as its lower support vibration damper. The low-noise vibration damper 100 is connected to the bottom of the outer tub 101 and the bottom of the cabinet 102 of the washing machine through its connection hole 11 and connection hole 21, and with the help of flexible washers and other connecting parts.

[0039] During washing machine operation, especially high-speed spin-drying, the complex vibrations generated by the outer tub 101 are transmitted to the vibration damper 100. The piston rod 2 of the vibration damper 100 and the noise reduction support tube 1 undergo relative axial movement, and the damping plate 3 provides stable axial damping force to dissipate vibration energy and suppress amplitude. At the same time, the radial oscillation of the outer tub 101 is converted into a radial off-center load acting on the piston rod 2. At this time, the unique collaborative working mechanism of the guide protrusion 13 and the stop protrusion 14 inside the vibration damper 100 begins to play its role: for oscillation within the normal range, the guide protrusion 13 with small gap and low stiffness provides smooth guidance and absorbs micro-vibrations in a flexible contact manner, avoiding the generation of additional friction noise; for occasional severe unbalanced oscillation, the stop protrusion 14 with large gap and high stiffness provides reliable limiting, preventing internal hard collisions from generating impact noise, ensuring that the vibration damper 100 can maintain a low-noise, high-performance working state under various working conditions from smooth operation to extreme off-center load. Therefore, drum washing machines that utilize this low-noise vibration damper 100 can significantly reduce the noise generated during operation under all conditions, especially during the spin-drying process, thereby improving product quality and user experience.

[0040] In summary, this invention innovatively constructs a smart, graded-response radial constraint system by setting guide protrusions 13 and stop protrusions 14 with specific gap relationships and stiffness characteristics on the inner wall of its noise-reducing support tube 1. This system can achieve guiding and supporting functions according to the magnitude of the radial off-center load on the piston rod 2, thereby simultaneously solving the problems of abnormal friction noise and performance interference caused by excessively small gaps in traditional vibration dampers, as well as the problems of abnormal shaking, impact noise, and wear caused by excessively large gaps. This invention features a clever structural design that achieves significant low noise and high reliability without requiring complex electronic controls or expensive materials, making it particularly suitable for household appliances such as drum washing machines where operating noise requirements are increasingly stringent.

[0041] This utility model has been described through several specific embodiments. Those skilled in the art should understand that various modifications and equivalent substitutions can be made to this utility model without departing from its scope. Furthermore, various modifications can be made to this utility model for specific situations or circumstances without departing from its scope. Therefore, this utility model is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of this utility model.

Claims

1. A low-noise vibration damper, characterized in that, The device includes a piston rod (2), a noise reduction support tube (1) sleeved outside the piston rod (2), and a damping plate (3) located inside the noise reduction support tube (1). One end of the piston rod (2) extends into the noise reduction support tube (1) and can move along its axial direction. The damping plate (3) provides damping force during the movement of the piston rod (2). Multiple guide protrusions (13) and multiple stop protrusions (14) are spaced apart on the inner wall of the noise reduction support tube (1). A first gap (D1) is formed between the guide protrusion (13) and the outer surface of the piston rod (2), and a second gap (D2) is formed between the stop protrusion (14) and the outer surface of the piston rod (2). The first gap (D1) is smaller than the second gap (D2), and the stiffness of the guide protrusion (13) is smaller than the stiffness of the stop protrusion (14).

2. The low-noise vibration damper as described in claim 1, characterized in that, The number of guide protrusions (13) is greater than the number of stop protrusions (14).

3. The low-noise vibration damper as described in claim 1, characterized in that, The guide protrusion (13) is a guide rib, the stop protrusion (14) is a stop rib, and the width of the guide rib is smaller than the width of the stop rib.

4. The low-noise vibration damper as described in claim 1, characterized in that, The end face of the guide protrusion (13) is an arc-shaped concave surface that corresponds to and matches the outer surface contour of the piston rod (2).

5. The low-noise vibration damper as described in claim 1, characterized in that, The end face of the stop protrusion (14) includes an arcuate protrusion that protrudes toward the surface of the piston rod (2).

6. The low-noise vibration damper as described in any one of claims 1 to 5, characterized in that, The inner wall of the noise reduction support tube (1) is also provided with a plurality of limiting protrusions (15), and a third gap (D3) is formed between the limiting protrusions (15) and the outer surface of the piston rod (2), and the third gap (D3) is larger than the second gap (D2).

7. The low-noise vibration damper as described in claim 6, characterized in that, The plurality of stop protrusions (14) and the plurality of limiting protrusions (15) all extend radially along the noise reduction support tube (1).

8. The low-noise vibration damper as described in any one of claims 1 to 5, characterized in that, The low-noise damper (100) includes a damping cap (4) fixed to the opening of the noise reduction support tube (1) to abut against the damping plate (3); and / or, the inner surface of the damping plate (3) is provided with lubricating grease.

9. The low-noise vibration damper as described in claim 8, characterized in that, Both the noise reduction support tube (1) and the piston rod (2) have connection holes at their ends, and flexible washers are provided in the connection holes.

10. A drum washing machine, comprising an outer tub (101) and a casing (102), characterized in that, The drum washing machine includes a low-noise vibration damper (100) as described in any one of claims 1 to 9, the low-noise vibration damper (100) being connected between the lower part of the outer tub (101) and the housing (102) to support the outer tub (101), and the drum washing machine further includes a suspension rod assembly (103) being connected between the upper part of the outer tub (101) and the housing (102) to suspend the outer tub (101).

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