CN109957919B

CN109957919B - Damper and laundry treating apparatus including the same

Info

Publication number: CN109957919B
Application number: CN201711432824.6A
Authority: CN
Inventors: 赵志强; 吕佩师
Original assignee: Qingdao Jiaonan Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Jiaonan Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2021-12-03
Anticipated expiration: 2037-12-26
Also published as: CN109957919A

Abstract

The invention relates to the technical field of washing machines, in particular to a shock absorber and a washing machine comprising the same. The invention aims to solve the problems of invariable damping force, poor vibration damping effect and the like of the shock absorber in the prior art. To this end, the shock absorber of the present invention comprises: a sleeve having a first chamber; a plunger having a second chamber, the plunger slidably inserted into the first chamber; the shock absorber is characterized by further comprising a throttling element arranged in the first chamber, the throttling element comprises a tube structure partially inserted into the second chamber, a plurality of first damping holes are formed in the tube wall of the tube structure, a movable sealing structure is arranged between the outer wall of the tube structure and the inner wall of the plunger, and one part of the first damping holes is in an opening/closing state along with the sliding of the plunger, so that the first chamber and the second chamber are communicated with each other through the first damping holes in the opening state. The damping force generated by the shock absorber is variable at any time and has high stability.

Description

Damper and laundry treating apparatus including the same

Technical Field

The invention relates to the technical field of clothes treatment, in particular to a shock absorber and a clothes treatment device comprising the same.

Background

The washing machine is a clean electrical appliance for washing clothes by using electric energy, and has become one of the essential household electrical appliances in daily life with the acceleration of life pace and the improvement of the requirement of people on living comfort. However, the washing machine generates significant vibration and noise during washing, dehydration, and other operations, which may affect the user experience to some extent.

In order to solve the problem that the washing machine generates obvious vibration and noise in the working processes of washing, dewatering and the like, the invention patent application with the publication number of CN105986407A discloses a shock absorber, a washing machine and a clothes dryer. The shock absorber comprises a sleeve with an opening at one end and a first plunger, one end of the first plunger is a fixed end, the other end of the first plunger is inserted into the sleeve from the opening of the sleeve and can slide along the sleeve, and a friction plate in friction fit with the first plunger is arranged between the first plunger and the sleeve; the sleeve is provided with an elastic part and a second friction sliding device which is connected with the elastic part and can slide in a friction mode relative to the sleeve, and when the first plunger moves relative to the sleeve to exceed a preset position, the first plunger is abutted against the second friction sliding device and compresses the elastic part.

The damper mainly achieves the purpose of reducing the vibration of the washing machine through the friction force generated by the friction between the first plunger and the friction plate in the reciprocating motion process of the first plunger in the sleeve, and the friction force and the elastic force generated by pushing the second friction sliding device to compress the elastic part after the first plunger exceeds a preset position. However, when the first plunger reciprocates in the sleeve, the frictional force generated by the second friction sliding means and the elastic force generated by the elastic member intervene only when the first plunger makes a compressing motion with respect to the sleeve and exceeds a predetermined position, and when the predetermined position is not exceeded and the first plunger makes a stretching motion with respect to the sleeve, the frictional force generated is a constant force regardless of the amplitude of the washing machine. Therefore, the damping force generated by the shock absorber to reduce vibration cannot be adjusted at any time according to the increase of the movement stroke of the first piston relative to the sleeve, and the vibration damping effect is to be further improved. In addition, after the shock absorber adopting the arrangement mode is used for a period of time, the friction force is reduced due to the abrasion of the friction plate and the second friction sliding device, and then the shock absorber gradually loses efficacy, so that the noise and the vibration of the washing machine are increased, and the use experience is influenced.

Accordingly, there is a need in the art for a new shock absorber that solves the above problems.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem that the conventional damper is easily out of service due to poor damping effect, wear of a friction ring, and the like during the working processes of washing, dehydration, and the like, the present invention provides a damper, comprising: the method comprises the following steps: a sleeve having a first chamber; a plunger having a second chamber, the plunger slidably inserted into the first chamber; the shock absorber further comprises a throttling element arranged in the first chamber, the throttling element comprises a pipe structure partially inserted into the second chamber, a plurality of first damping holes are formed in the pipe wall of the pipe structure, a movable sealing structure is arranged between the outer wall of the pipe structure and the inner wall of the plunger, and one part of the first damping holes is in an opening/closing state along with the sliding of the plunger, so that the first chamber and the second chamber are communicated with each other through the first damping holes in the opening state.

In a preferred technical solution of the above shock absorber, the shock absorber further includes a liquid bag, the liquid bag is disposed in the first chamber, an open end of the liquid bag is fixedly connected to the plunger, wherein an inner cavity of the liquid bag and/or the second chamber is filled with damping fluid, and the throttling element is disposed in the liquid bag.

In a preferred aspect of the above damper, the seal structure includes: a seal groove provided on an outer wall of the pipe structure or an inner wall of the plunger and having a set width in an axial direction of the second chamber; and the sealing ring is movably clamped in the sealing groove.

In a preferred embodiment of the above shock absorber, the sealing groove is disposed on an outer wall of the tube structure, and the sealing groove is disposed in the second chamber throughout a stroke in which the plunger slides back and forth relative to the sleeve.

In the preferable technical scheme of the shock absorber, the sealing ring is radially and fittingly clamped in the sealing groove along the second cavity, and the width of the sealing ring along the axial direction of the second cavity is smaller than that of the sealing groove.

In a preferable technical solution of the above shock absorber, a width of the sealing groove in the axial direction of the second chamber is 1/20-1/3 of the total axial length of the second chamber, and a difference between the width of the sealing groove and the width of the sealing ring in the axial direction of the second chamber is not greater than 50 mm.

In a preferable technical scheme of the shock absorber, a width difference between the sealing groove and the sealing ring along the axial direction of the second cavity is not greater than 8 mm.

In a preferred technical solution of the above shock absorber, the throttle further includes a base, and the base is disposed at an end of the sac away from the plunger so as to clamp the sac between the sleeve and the base.

In a preferred embodiment of the shock absorber, the tube structure is provided with a cover in a radial direction, the cover is provided with at least one second orifice, and the first chamber and the second chamber are communicated with each other via the second orifice and the first orifice in an open state.

The invention also provides a clothes treatment device which comprises the shock absorber in any one of the aspects. If the laundry treating apparatus is a drum washing machine, the drum washing machine includes a housing and a drum disposed in the housing, the drum is supported in the housing by a plurality of dampers, at least one of the dampers being the damper described in any of the above aspects.

As will be appreciated by those skilled in the art, in a preferred embodiment of the invention, the shock absorber comprises a sleeve having a first chamber and a plunger provided with a second chamber, the plunger being slidably inserted in the first chamber; the liquid bag is arranged in the first cavity, the open end of the liquid bag is fixedly connected with the plunger through the pressing ring, damping fluid is filled in the inner cavity of the liquid bag and/or the second cavity, the liquid bag is further provided with a throttling piece, the throttling piece comprises a bottom plate and a pipe structure, and one part of the pipe structure is inserted into the second cavity. The tube structure is provided with a plurality of first damping holes, and the liquid bag and the second chamber are communicated with each other by means of the first damping holes in an open state. Through the arrangement of the liquid bag and the throttling element, the variable damping effect of the shock absorber is realized in a hydraulic mode. That is, when the damper of the present invention is used in a laundry treating apparatus such as a washing machine, the damping force applied to the plunger is variable at any time, and the damper can automatically adjust the damping force according to the vibration frequency of the washing machine toward the trend of optimizing the vibration damping performance, that is, to form a damping force more matched with the offset vibration, thereby reducing the vibration of the washing machine and reducing the noise of the washing machine due to the vibration. And a sealing structure is arranged between the outer wall of the tube structure and the inner wall of the plunger, the sealing structure has a certain width along the axial direction of the second cavity, and a certain width difference is formed between the sealing ring and the sealing groove in the sealing structure.

Drawings

The damper and the laundry treating apparatus including the same of the present invention will be described with reference to the accompanying drawings in conjunction with a drum washing machine. In the drawings:

FIG. 1 is a schematic view illustrating an installation position of a damper for a drum washing machine according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a damper for a drum washing machine according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view illustrating a damper for a drum washing machine according to an embodiment of the present invention;

fig. 4 is a structural schematic view of a sealing structure of a damper for a drum washing machine according to an embodiment of the present invention; and

fig. 5 is an enlarged schematic view of fig. 3 at a portion a.

List of reference numerals:

1. a shock absorber; 11. a sleeve; 111. a first fixed part; 112. a first chamber; 113. A silencing hole; 114. reinforcing ribs; 12. a plunger; 121. a second fixed part; 122. a second chamber; 13. a throttle member; 131. a base; 132. a tube structure; 1321. a first orifice; 13231. a sealing groove; 13232. a seal ring; 134. sealing the cover; 1341. a second orifice; 14. a liquid sac; 161. A first annular boss; 163. pressing a ring; 164. a first annular groove; 165. a second annular groove; 171. clamping a hoop; 172. a claw; 173. a first fixing hole; 174. a second fixing hole; 2. a housing; 3. a drum; 4. and (5) hydraulic oil.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the description has been made in connection with the damping fluid being hydraulic oil, it is obvious that the invention may be applied to other forms of damping fluid having a certain viscosity as long as the damping fluid is capable of achieving a variable damping effect through the flow between the plunger and the sac through the (first and second) damping holes and the damping fluid itself does not corrode the plunger and the sac. The damping fluid may be a liquid such as a damping liquid, or may be a damping grease that moves when squeezed and exists in a viscous solid shape.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring first to fig. 1, fig. 1 is a schematic view illustrating an installation position of a damper for a drum washing machine according to an embodiment of the present invention. As shown in fig. 1, the drum washing machine mainly includes a casing 2 and a drum 3 disposed in the casing 2, and the drum 3 includes an outer tub and an inner tub rotatable with respect to the outer tub. Two dampers 1 are provided between the lower side of the outer cylinder and the inside of the bottom of the housing 2 so as to reduce vibration and noise generated during rotation of the inner cylinder. Referring specifically to fig. 1, one end of a damper 1 is fixed to the inside of the bottom of a casing 2, and the other end of the damper 1 is fixed to the bottom of an outer tub, and when a drum 3 vibrates during operation, the damper 1 can support the drum 3 and dissipate vibration energy generated from the drum 3. Particularly, the damper of the present invention can automatically adjust the damping force according to the amplitude of the vibration generated by the washing machine, so that the damper generates the damping force matched with the vibration of different degrees, thereby effectively attenuating the vibration energy of the washing machine, and finally reducing the vibration of the drum washing machine and reducing the noise generated along with the vibration. It will be appreciated that the specific form and number of dampers need not be the same, and for example three, four or more dampers may be provided, some of which may be the dampers 1 of the present invention and others of which may be other types of dampers.

Referring next to fig. 2 and 3, fig. 2 is a schematic structural view of a damper for a drum washing machine according to an embodiment of the present invention, and fig. 3 is a schematic sectional view of the damper for a drum washing machine according to an embodiment of the present invention. As shown in fig. 2 and 3 and according to the orientation in fig. 3, the damper 1 mainly includes a sleeve 11, a first fixing portion 111 provided at a left end of the sleeve 11, a plunger 12, and a second fixing portion 121 provided at a right end of the plunger 12, the first fixing portion 111 being for connection to the bottom of the drum 3 of the washing machine, and the second fixing portion 121 being for connection to the inside of the bottom of the casing 2 of the washing machine. Wherein the plunger 12 is inserted into the sleeve 11 from the right end of the sleeve and can reciprocate along the sleeve.

With particular reference to fig. 3 and in accordance with the orientation of fig. 3, the sleeve 11 has a first chamber 112 opening to the right, and the plunger 12 has a second chamber 122 opening to the left, with the left end of the plunger 12 being slidably insertable into the first chamber 112 from the right end of the sleeve 11. Preferably, the outer wall of the plunger 12 is slidably engaged tightly with the inner wall of the sleeve 11 to prevent wobbling of the plunger during sliding in the first chamber 112. It is understood that the connection positions of the (first and second) fixing parts and the washing machine may be reversed, that is, the first fixing part 111 is connected to the inner side of the bottom of the casing 2 of the washing machine, and the second fixing part 121 is connected to the bottom of the drum 3 of the washing machine. A sac 14 is provided in the first chamber 112 and fixed to the left end of the second chamber, and a throttle 13 is provided in the sac 14 and fixed to the left end of the first chamber. Preferably, the closed end of the sac 14, i.e. the left end of the sac 14, abuts against the left end of the first chamber 112 of the sleeve 11 and is preferably fixedly connected with the sleeve 11, and the open end of the sac 14, i.e. the right end of the sac 14, is fixedly connected with the left end of the plunger 12 in a sealing manner.

Still referring to fig. 3, the throttling element 13 mainly comprises a base 131 of a disk-like structure adapted to the inner wall of the first chamber and a tube structure 132 arranged at the right side of the base and integrally formed with the base 131 and having an outer diameter matched with the inner wall of the second chamber, the base 131 is fixed at the left end of the first chamber, i.e. the closed end of the sac 14 is clamped between the left side of the inner wall of the first chamber and the left side of the base 13, and a portion of the right side of the tube structure 132 is inserted into the second chamber 122 so as to allow the portion of the plunger corresponding to the first chamber to reciprocate relative to the sleeve in a sliding manner between the inner wall of the sleeve and the outer wall of the tube structure. The tube structure 132 is provided with a plurality of first damping holes 1321 as variable damping holes, the right end of the tube structure 132 is provided with a cover 134, the cover 134 is fixed at the right end of the tube structure 132 in a threaded connection manner, and the cover 134 is provided with a second damping hole 1342 as a main damping hole. Hydraulic oil 4 is filled in the inner cavity of the liquid bag 14 and/or the second chamber 122 as a damping fluid, when the plunger 12 slides in the first chamber 112 of the sleeve 11, a part of the plurality of first damping holes 1321 is in an open state, so that the hydraulic oil 4 can flow back and forth in the liquid bag 14 and the second chamber 122 through the first damping holes 1321 in the open state, and vibration energy is converted into heat energy through resistance generated when the hydraulic oil 4 passes through the (first and second) damping holes, thereby achieving the effects of absorbing vibration and reducing noise.

The mode that the second damping hole is formed in the sealing cover is substantially equivalent to that the density of the first damping hole on the right side of the pipe structure is greatly increased, so that when the plunger compresses and extends for the same distance, the damping force in the compression process is larger than that in the extension process, and different damping characteristics of the plunger in the compression stroke and the extension stroke are realized. Taking the case that the second damping hole is arranged in the middle of the sealing cover, if the size of the second damping hole is too large and is close to the upper limit, the diameter of the second damping hole is approximately equal to the diameter of the sealing cover, namely the sealing cover is basically not arranged, and the hydraulic oil flows between the liquid bag and the second chamber through the first damping hole in the open state and the inner cavity of the pipe structure. Because the radial dimension of the pipe structure is larger, the throttling damping is very weak, and the damping changing effect is not obvious in the oil inlet/outlet process. Based on this principle, the second damping orifice can be adjusted for a specific product in order to optimize the effect of the variable damping.

In addition, the number and size of the (first and second) damping holes are not limited in this embodiment, and the number and diameter of the first damping holes are different for different models of shock absorbers 1. For example, for a relatively small shock absorber 1, the diameter of the first orifice 1321 may be in the interval of a few tenths of a millimeter to a few millimeters; whereas for a relatively large shock absorber 1, the diameter of the first orifice 1321 may be in the interval of several millimeters to ten and several millimeters. If the axis of the first damping orifice 1321 should be angled with respect to the axis of the tube structure 132 to allow hydraulic oil to enter/exit the tube structure, the angle between the axis of each first damping orifice 1321 and the axis of the tube structure 132 may be the same or different. The distribution density of the first damping holes 1321 on the pipe structure may be uniform or non-uniform, and the hole diameters of the individual first damping holes 1321 may be the same or different. If two rows (front and rear of the tube structure in fig. 3) of first damping holes with approximately the same diameter are axially arranged on the tube structure 132, the density of the first damping holes in each row in the axial direction is increased (preferably gradually increased) from left to right, and the axis of each first damping hole is approximately perpendicular to the axis of the tube structure 132.

Preferably, the sac 14 may be made of an elastic material such as polyurethane, silicone, rubber, etc., and the body of the sac preferably has a bellows structure so as to be compressed/elongated and deformed during the reciprocation of the plunger.

Referring to fig. 2 and 3, in order to reduce noise generated by the air compression of the plunger 12 during the reciprocating movement, the sleeve 11 is provided with a noise-deadening hole 113, and specifically, the noise-deadening hole 113 is provided in a portion where the sleeve 11 and the plunger 12 are joined. It should be noted that the term "portion of the sleeve which engages the plunger" as used herein includes both a portion which is permanently engaged, i.e. remains engaged with the plunger in the event that the plunger is moved to the far right, and a portion which is reversibly engaged, i.e. engages the plunger only at some stage during the movement of the plunger in the first chamber. And in order to improve the strength of the sleeve, a transverse rib 114 may be arranged in the axial direction on the portion of the sleeve close to the plunger 12, or a ring-shaped rib 114 may be circumferentially surrounded. In addition, in order to further secure the fixed connection between the base 131, the closed end of the liquid bag 14, and the left end of the sleeve 11 and the positional relationship therebetween, a fixing member may be provided to the shock absorber 1. Referring to fig. 3, if the fixing member includes a clamp 171 of a cylindrical structure sleeved outside the sleeve 11 and a plurality of jaws 172 disposed inside the clamp, corresponding to the jaws 172, a clamping hole is disposed on the sleeve 11, the base can be clamped between the left end of the first chamber 112 and the jaws by extending the jaws 172 into the clamping hole, meanwhile, a first fixing hole 173 and a second fixing hole 174 are further disposed on the clamp and the sleeve, and the clamp is fixed at a position of the sleeve near the first fixing end by means of the cooperation of fasteners such as screws and the like and the (first and second) fixing holes. Preferably, a certain free stroke space may be reserved between the left end of the first chamber 112 and the left side of the jaw to further optimize the damping performance of the damper. It will be appreciated that to ensure the feasibility of the assembly process, the clip should be a non-closed ring with an opening in the axial direction. Through the arrangement, the base can be stably positioned at the left side of the first chamber or can only move in a free stroke space, so that the relative sliding between the plunger 12 and the throttling element 13 is smoother and more stable, and the condition that the shock absorber 1 fails due to the offset of the pipe structure 132 in the working process is avoided.

It should be noted that although the embodiment is described in the form that the base of the throttling element is integrally formed with the pipe structure, and the cover is fixed to the pipe structure by screwing, this is only for illustrating the principle of the present invention, and is not intended to limit the protection scope of the present invention. It is clear that any form of modification falls within the scope of protection of the present invention, without departing from the principle of the invention. For example, the base and the pipe structure can be formed respectively and then fixedly connected; if the sealing cover and the pipe structure can be fixedly connected through other modes such as ultrasonic welding, scarf joint and clamping, and sealing structures such as a sealing ring and a sealing ring can be arranged at the joint of the sealing cover and the pipe structure. The operation of the damper 1 for a drum washing machine according to the present invention will be briefly described with reference to fig. 3 by taking the case where the drum washing machine generates large vibration as an example.

As shown in fig. 3 and according to the orientation in fig. 3, when the plunger 12 is forced to slide leftward, the volume of the fluid bag 14 decreases, the first damping hole 1321 in the open state on the throttling element 13 decreases, the hydraulic oil 4 is squeezed, a positive pressure is generated in the inner cavity of the fluid bag 14, the hydraulic oil 4 sequentially passes through the first damping hole 1321 in the open state as a variable damping hole and the second damping hole 1341 as a main damping hole and flows from the inner cavity of the fluid bag 14 to the second chamber 122, the hydraulic oil 4 generates a rightward damping force on the plunger 12 in the process of flowing to the second chamber 122, and the leftward movement tendency of the plunger 12 is reduced, so that the effects of vibration reduction and noise reduction are achieved. Similarly, when the plunger 12 is forced to slide rightwards, the volume of the liquid bag 14 becomes large, the first damping hole 1321 in the opening state on the throttling element 13 is increased, the hydraulic oil 4 is extruded, the inner cavity of the liquid bag 14 generates negative pressure, the hydraulic oil 4 sequentially passes through the second damping hole 1341 and the first damping hole 1321 in the opening state and flows from the second chamber 122 to the inner cavity of the liquid bag 14, the hydraulic oil 4 generates a leftward damping force on the plunger 12 in the process of flowing to the inner cavity of the liquid bag 14, the rightward movement trend of the plunger 12 is slowed down, and therefore the effects of vibration reduction and noise reduction are achieved. In the process that the hydraulic oil flows in the inner cavity of the liquid bag and the second cavity of the plunger, the first damping holes which are arranged on the tube structure and participate in the flow path of the hydraulic oil in variable quantity are matched with the second damping holes which are arranged on the sealing cover and participate in the flow path of the hydraulic oil in constant quantity, the larger the impact force applied to the roller of the washing machine is, the larger the stroke of pressing the plunger of the shock absorber into the sleeve is, the larger the damping force of the hydraulic oil discharging can be gradually improved, namely, the damping force changes along with the stroke change of the plunger, thereby realizing the variable damping effect that the damping force changes along with the change of the impact force, improving the loss of viscous damping to vibration, effectively avoiding that when the washing machine is subjected to sudden large impact, the too small number of the first damping holes can cause the damping of the hydraulic oil passing through the first damping holes to be extremely large, so that certain rigid transmission is formed and the washing machine can vibrate greatly.

Preferably, referring to fig. 3 and 4, fig. 4 is a schematic structural view of a sealing structure of a damper for a drum washing machine according to an embodiment of the present invention. As shown in fig. 3 and 4, in order to ensure the sealing performance between the throttle 13 and the plunger, a sealing structure is provided between the tube structure 132 and the plunger 12. The inventor discovers that in the experimental process, due to the fact that reciprocating motion of the plunger in the first cavity is frequent, reciprocating motion of the tube structure in the second cavity is also frequent, and if the sealing structure adopts a mode that radial sizes of sealing rings such as an O-shaped sealing ring and the like embedded in the annular sealing groove are small, the O-shaped sealing ring is easily abraded due to the fact that the O-shaped sealing ring rotates in the annular sealing groove. In view of this, the inventors have repeatedly tested and experimentally determined that the form of the sealing structure is: a sealing groove 13231 is formed in the outer wall of the tube structure, the sealing groove has a certain width, such as 1/20-1/3, preferably the axial length of the second chamber, such as 1/7-1/5, the sealing groove 13231 and the inner wall of the plunger 12 form a sealing cavity, a sealing ring 13232 is clamped in the sealing cavity, and the sealing ring can be made of metal or inorganic non-metal materials, preferably high polymer materials such as polyurethane, rubber, thermoplastic elastomer and the like. Through the cooperation of the wider sealing groove 13231 and the sealing ring, the sealing performance between the throttling element 13 and the plunger 12 is improved, the leakage of hydraulic oil in the gap between the throttling element and the plunger is reduced, and the viscous damping effect is improved. Specifically, the hydraulic oil 4 can only flow between the inner cavity of the liquid bag 14 and the second chamber of the plunger 12 through the first damping hole in the open state and the second damping hole on the sealing cover, so that the precision of the damping force provided by the shock absorber is ensured, and the problem that the throttling resistance of the shock absorber is greatly reduced due to the fact that the fit clearance between the plunger and the throttling element is too large and further hydraulic oil easily flows in too large clearance due to the machining precision of the shock absorber, abrasion and the like is effectively solved. Also, because the sealing ring 13232 is continuously in the environment of the encapsulated hydraulic oil, the life cycle of the sealing ring is increased, indirectly increasing the life cycle of the shock absorber. It will be appreciated that the seal groove 13231 may also be provided on the plunger and cooperate with the outer wall of the tubular structure 13 to form a sealed cavity that receives the seal ring 13232.

Still referring to FIG. 4, preferably, the sealing groove 13231 and the sealing ring 13232 are maintained in radial mating engagement but the width along the axial direction of the second chamber of the sealing groove 13231 is greater than the width of the sealing ring 13232, and such difference in width may allow the sealing ring to slide within the sealing groove within a certain free travel (0 ≦ h ≦ 50mm) to further optimize the damping performance of the damper. Preferably 0 h 15mm, more preferably 0 h 8mm for better matching with the drum amplitude of the washing machine in a high speed motion state. In particular, the provision of a wider seal groove may enable the shock absorber 1 to provide different damping forces under different vibration conditions. For example, when the washing machine generates small vibration, the sealing ring 13232 may make a small portion of the hydraulic oil 4 enter the sealing groove by sliding in the sealing groove 13231, so as to reduce the resistance when the hydraulic oil 4 flows back and forth in the liquid bag 14 and the second chamber 122, so that the damping force provided by the damper 1 is also reduced when the small vibration occurs, the small vibration of the drum 3 transmitted to the casing of the washing machine through the damper 1 is reduced, and the stable operation and low noise of the washing machine are ensured. When the washing machine generates large vibration, the sealing ring 13232 does not move relative to the sealing groove 13231 substantially at the time due to the large vibration and the fast vibration speed, which is equivalent to the sealing ring being fixedly connected in the sealing groove, and the resistance of the hydraulic oil 4 flowing back and forth in the liquid bag 14 and the second chamber 122 is not changed substantially, so that the shock absorber 1 can provide a relatively large damping force at the time of the large vibration, thereby rapidly reducing the vibration generated by the washing machine. Preferably, the first and second electrodes are formed of a metal,

referring to fig. 5, fig. 5 is an enlarged schematic view of a portion a of fig. 3. In a particular embodiment, the sac is sealingly fixed in connection with the left end of the second chamber by means of a press ring 163, as shown in fig. 5. As shown in fig. 5, a first annular groove 164 is additionally provided at the right end of the pressing ring 163 so that a stepped surface is formed at the right side of the pressing ring 163. The clamping ring is stably fixed at the left end of the plunger in a tightly matched mode, and the opening end of the liquid sac is clamped between the clamping ring and the left end of the plunger. Specifically, the open end of the sac 14 having a cylindrical structure includes an axial clamping section and a radial clamping section, a second annular groove 165 is provided on the left end face of the plunger 45, a first annular boss 161 is provided radially outside the second annular groove 165, the axial clamping section of the sac is clamped in an axial annular space formed by the pressing ring and the tube structure, the radial clamping section of the sac is clamped in a radial annular space formed by the first annular groove 164 and the second annular groove 165, and the pressing ring is fixed to the left end of the plunger 12 by the close fit of the step face and the first annular boss 161. In this way, after the throttle and the sac are mounted at the left end of the plunger, the pressing ring is pushed to the right, the axial clamping section of the opening end of the sac is pressed into the central hole of the pressing ring, and the radial clamping section of the opening end of the sac forms a thickened part and is extruded into the radial annular gap, so that the open end of the sac and the plunger can be fastened and sealed more effectively and reliably. Obviously, the pressing ring 163 and the left end face of the plunger 12 may be fastened by bolts, ultrasonic welding, adhesion, and snapping. And the free end of the liquid bag can be fixedly connected with the plunger piston in a sealing way through other structures such as an embedded block and the like.

It can be seen that in the shock absorber of the present invention, when the shock absorber is in a stable state without being subjected to an external pressure, the first damping hole distributed in the axial direction of the tube structure is divided into two parts, i.e., a first part in the inner cavity of the sac and a second part in the second chamber, by using the pressing ring 163 as a boundary. Wherein, the number and/or density and/or aperture and/or angle of the first damping holes of the first part and the second part can be the same or different. If the number of the throttling holes close to the liquid bag is large or the density is high, namely the plunger can be compressed and extended for the same distance, the damping force in the compression process is smaller than that in the extension process, and vice versa. It should be noted that the cover may be disposed at any axial position of the tube structure other than the end of the tube structure, for example, radially clamped in the inner cavity portion of the tube structure, and in this case, the first damping hole of the second portion should be a portion between the pressing ring and the cover.

In summary, in the shock absorber of the invention, 1) through the arrangement of the liquid bag and the throttling element, the vibration attenuation and noise reduction of variable damping are realized hydraulically through the flow of hydraulic oil between the inner cavity of the liquid bag and the second cavity of the plunger; 2) through the matching of the first damping hole on the pipe structure and the second damping hole on the sealing cover, the vibration reduction effect is optimized and the rigid vibration under large impact is avoided; 3) through the setting of (seal groove, sealing ring), on the one hand, make hydraulic oil only can flow between the inner chamber of liquid bag and second cavity through the second damping hole on the closing cap and the first damping hole that is in the open mode, guaranteed the precision of the damping force that the bumper shock absorber provided to avoided effectively because the plunger that causes such as bumper shock absorber machining precision, wearing and tearing and throttling element fit the clearance too big and further leaded to hydraulic oil light to flow the problem that makes the throttling resistance greatly reduced of bumper shock absorber in too big clearance. And, reserve certain free stroke for the sealing ring through in the seal groove, can reduce the vibration that washing machine produced fast when washing machine produces big vibration, further optimized the damping effect.

Furthermore, it should be noted that although the above preferred embodiment is described by taking a drum washing machine as an example, this is not intended to limit the scope of the present invention, and it will be appreciated by those skilled in the art that the present invention can also be applied to other clothes treatment devices besides a drum washing machine, such as a clothes dryer and a shoe washing machine, etc. having the same or similar vibration damping requirements.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. A shock absorber, comprising:

a sleeve having a first chamber;

a plunger having a second chamber, the plunger slidably inserted into the first chamber;

characterized in that, the bumper shock absorber still includes:

1) the throttling element is arranged in the first chamber and comprises a pipe structure which is partially inserted into the second chamber, a plurality of first damping holes are arranged on the pipe wall of the pipe structure,

wherein a movable sealing structure is arranged between the outer wall of the tube structure and the inner wall of the plunger,

wherein a part of the plurality of first orifice holes is in an open/closed state with the sliding of the plunger so as to communicate the first chamber and the second chamber with each other via the first orifice holes in the open state;

2) a sac arranged in the first chamber, an open end of the sac being fixedly connected to the plunger,

wherein the inner cavity of the liquid bag and/or the second chamber are filled with damping fluid, and the throttling element is arranged in the liquid bag.

2. The shock absorber according to claim 1, wherein said sealing structure comprises:

a seal groove provided on an outer wall of the pipe structure or an inner wall of the plunger and having a set width in an axial direction of the second chamber;

and the sealing ring is movably clamped in the sealing groove.

3. The shock absorber according to claim 2, wherein said seal groove is provided in an outer wall of said tube structure, and wherein said seal groove is provided in an outer wall of said tube structure

The seal groove is arranged to be located in the second chamber throughout a stroke of the plunger reciprocating relative to the sleeve.

4. The shock absorber according to claim 2, wherein said sealing ring is radially fitted into said sealing groove along said second chamber, and a width of said sealing ring in an axial direction of said second chamber is smaller than that of said sealing groove.

5. The shock absorber according to claim 4, wherein a width of the seal groove in the axial direction of the second chamber is 1/20-1/3 of an axial total length of the second chamber, and a difference in the width of the seal groove and the seal ring in the axial direction of the second chamber is not more than 50 mm.

6. The shock absorber according to claim 5, wherein a difference in width of the seal groove and the seal ring in an axial direction of the second chamber is not more than 8 mm.

7. The shock absorber according to any one of claims 1 to 6, wherein the throttle further comprises a seat provided at an end of the sac remote from the plunger so as to trap the sac between the sleeve and the seat.

8. Shock absorber according to claim 7, wherein said tube structure is provided with a cover in radial direction, said cover being provided with at least one second damping orifice,

the first chamber and the second chamber communicate with each other via the second orifice and the first orifice in an open state.

9. A laundry treating apparatus, characterized in that it comprises a damper according to any one of claims 1 to 8.