CN109385825B

CN109385825B - Damper and laundry treating apparatus including the same

Info

Publication number: CN109385825B
Application number: CN201710693459.8A
Authority: CN
Inventors: 赵志强; 吕佩师; 许升; 宋华诚; 杨旭光; 赵新宇
Original assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2017-08-14
Filing date: 2017-08-14
Publication date: 2021-12-03
Anticipated expiration: 2037-08-14
Also published as: CN109385825A

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 liquid sac is arranged in the first chamber, and the open end of the liquid sac is fixed at the first end of the plunger; wherein the inner cavity of the sac and/or the second chamber are filled with fluid, and a silencing hole is arranged at the part of the sleeve, which is jointed with the plunger. The damping performance of the shock absorber is optimized by the high precision flow of the fluid in the sac between the first chamber and the second chamber. Through the setting of bloop, reduced the noise that the bumper shock absorber produced because the removal of plunger.

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 electric appliance for washing clothes by using electric energy, and becomes an essential household appliance in daily life with the acceleration of life rhythm and the improvement of the requirement of people on the living comfort level. However, the washing machine generates significant vibration and noise during washing, rinsing and dehydrating processes, causing some inconvenience to the normal life of people.

In order to solve the problem of excessive vibration and noise during the operation of the washing machine, 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 of a user 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 problems of the prior art that the vibration damping effect is poor in the working process of the shock absorber, and the shock absorber is easy to fail due to the abrasion of the friction ring, the invention provides a shock absorber, which comprises: a sleeve having a first chamber; a plunger having a second chamber, the plunger slidably inserted into the first chamber; the liquid sac is arranged in the first chamber, and the open end of the liquid sac is fixed at the first end of the plunger; wherein the inner cavity of the sac and/or the second chamber are filled with fluid, and a silencing hole is arranged at the part of the sleeve, which is jointed with the plunger.

The damping performance of the shock absorber is optimized by the high precision flow of the fluid in the sac between the first chamber and the second chamber. Through the setting of bloop, reduced the noise that the bumper shock absorber produced because the removal of plunger.

In a preferred embodiment of the above shock absorber, a throttle member is provided in the liquid bag, a part of the throttle member is inserted into the second chamber, the throttle member is provided with a plurality of damping holes, a part of the plurality of damping holes is in an open/closed state with the sliding of the plunger, and the first chamber and the second chamber are communicated with each other through the damping holes in the open state.

Through the setting of fluid bag and dispose the throttling element in the fluid bag, when the plunger moved left and made first cavity produce the malleation, the quantity that is used for communicating the damping hole of fluid bag and second cavity reduces gradually to make the fluid pass through the damping hole and enter into the degree of difficulty in the second cavity more and more, the damping force of producing oil is more and more high, and the degree of difficulty of eliminating the fluid bag malleation is more and more big, thereby the damping force that the plunger received is also big more. When the plunger moves rightwards to enable the first chamber to generate negative pressure, the number of the damping holes for communicating the liquid bag and the second chamber is gradually increased, so that the difficulty of fluid entering the liquid bag through the damping holes is increased, the damping force of oil outlet is increased, the difficulty of eliminating the negative pressure of the liquid bag is increased, and the damping force applied to the plunger is increased. Therefore, in the shock absorber of the invention, as the stroke of the plunger in the sleeve is increased, the damping force of the oil outlet is gradually increased, and the damping force of the shock absorber is increased, thereby effectively reducing the vibration and the noise of the washing machine. That is to say, the bigger the vibration of the washing machine is, the bigger the stroke of the plunger in the sleeve is, the damping force of the oil can be improved, and the damping force provided by the shock absorber is bigger at the moment, so that the vibration and the noise of the washing machine are effectively reduced, and the performance of the shock absorber is optimized.

In a preferred embodiment of the shock absorber, the throttle member includes a base and a tube structure integrally formed or fixedly connected with the base, the base is disposed at an end of the liquid bag away from the plunger, and a portion of the tube structure is inserted into the second chamber.

In a preferred technical solution of the above shock absorber, the plurality of damping holes are uniformly or non-uniformly arranged on the outer wall of the tube structure along the axial direction of the tube structure, and the axes of the damping holes and the axis of the tube structure form an included angle.

In a preferred technical solution of the above shock absorber, the base is disposed at an end of the first chamber away from the plunger, and a circumferential outer edge of the base is matched with an inner wall of the first chamber.

In the preferred technical scheme of above-mentioned bumper shock absorber, the bumper shock absorber still includes tubular structure's clamp and sets up in a plurality of jack catch of clamp inboard, be provided with on the sleeve with the card hole that the jack catch corresponds, the clamp will through jack catch and card hole matched with mode the base card is arranged in first cavity.

In a preferred embodiment of the above shock absorber, a free stroke space is provided between the first end of the first chamber and the jaw, and the base is configured to be movable in the free stroke space.

Through the setting of base, make the throttling element can be reliably, stably in first cavity, the base is in first cavity steadily promptly and keeps away from in the within range that free stroke space allows the one end of plunger, and the outer fringe through the base and first cavity butt closely, make the relative slip between plunger and the throttling element more smooth and stable, avoid because the tubular structure of throttling element takes place the biasing and lead to the condition appearance of bumper shock absorber inefficacy.

In a preferred technical scheme of the shock absorber, a sealing cover is arranged at one end, close to the plunger, of the tube structure, a sliding block is arranged in an inner cavity of the tube structure, and the sliding block can freely slide in the inner cavity of the tube structure.

In a preferred embodiment of the above shock absorber, a reinforcing rib is provided at a portion of the sleeve adjacent to the plunger.

The invention also provides a clothes treatment device, which comprises a shell and a washing drum arranged in the shell, wherein the washing drum is supported in the shell through a plurality of shock absorbers, and at least one of the shock absorbers is the shock absorber in any scheme.

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; be provided with the sac in the first cavity, the open end of sac passes through clamping ring and plunger fixed connection, and it has fluid to fill in the inner chamber of sac and/or the second cavity, and telescopic left end is provided with clamp/jack catch, and the sleeve leans on the position on right side to have bloop and strengthening rib. The liquid bag is also internally provided with a throttling piece, the throttling piece comprises a bottom plate and a pipe structure, and the pipe structure is inserted into the second chamber. The tube structure is provided with a plurality of damping holes, a part of the plurality of damping holes is in an open/close state along with the sliding of the plunger, and the liquid sac and the second chamber are communicated with each other by means of the damping holes in the open state. The hydraulic control of the damping is realized through the arrangement of the liquid bag; by the arrangement of the throttling element, the variable damping control of the plunger in the process of travel movement in the sleeve is realized; the fixing of the throttling element is realized through the arrangement of the clamping hoop/clamping jaw and the free stroke space. In addition, the shock absorber also has the advantages of long service life and high shock absorption reliability. When the damper is used for clothes treatment equipment (such as a washing machine), the damping force applied to the plunger can be changed at any time, and the damper can automatically adjust the damping force to the trend of optimizing the vibration reduction performance according to the vibration frequency of the washing machine, namely, the damping force more matched with the counteracting vibration is formed, so that the vibration of the washing machine is reduced, and the noise of the washing machine caused by the vibration is reduced.

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 the present invention;

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

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

FIG. 4 is an enlarged view of a portion of FIG. 3 at A showing one embodiment of a pressure ring seal; and

fig. 5 is a schematic structural view of a yoke of a damper for a drum washing machine according to the present invention.

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; 133. a damping hole; 134. sealing the cover; 135. a slider; 1351. a communicating hole; 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 fixing hole; 174. an opening; 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 fluid being hydraulic oil, it will be apparent that the invention may be used with other forms of fluid having a certain viscosity, provided that the fluid itself does not corrode the plunger and the sac.

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, 2 and 3, wherein fig. 1 is a schematic view of an installation position of a damper for a drum washing machine according to the present invention; FIG. 2 is a schematic structural view of a damper for a drum washing machine according to the present invention; fig. 3 is a cross-sectional view illustrating a damper for a drum washing machine according to the present invention. As shown in fig. 1, the damper 1 of the present invention has one end connected to a cabinet 2 of a drum washing machine and the other end connected to the bottom of a drum 3, and when the 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, i.e., the damping force varies with the stroke variation of the plunger, so that the damper generates the damping force matched with the different vibrations of the washing machine, thereby effectively attenuating the vibration energy of the washing machine, reducing the vibration of the washing machine and reducing the noise generated with the vibration.

As shown in fig. 2 and 3, the shock absorber 1 mainly includes a sleeve 11, a first fixing portion 111 fixedly connected to a first end of the sleeve 11 (a left end of the sleeve 11 shown in fig. 3), a plunger 12, and a second fixing portion 121 fixedly connected to a second end of the plunger 12 (a right end of the plunger 12 shown in fig. 3). Wherein the sleeve 11 has a first chamber 112 and the plunger 12 has a second chamber 122 disposed therein. In the assembled state, a first end of the plunger 12 (the left end of the plunger 12 shown in fig. 3) is slidably insertable into the first chamber 112 from a second end of the sleeve 11 (the right end of the sleeve 11 shown in fig. 3). Preferably, the outer wall of the plunger 12 is slidably in close engagement with the inner wall of the sleeve 11. The first fixing portion 111 is for connection to the drum 3 of the washing machine, and the second fixing portion 121 is for connection to the housing 2 of the washing machine. It is understood that the connection positions of the first fixing portion 111 and the second fixing portion 121 may be reversed, that is, the first fixing portion is connected to the housing 2 of the washing machine, and the second fixing portion is connected to the drum 3 of the washing machine.

With continued reference to fig. 3, a sac 14 is disposed in the first chamber 112, and a restriction 13 is disposed in the sac 14. The closed end of the sac 14 (the left end of the sac 14 shown in fig. 3) abuts against the first chamber 112 of the sleeve 11, preferably fixedly connected to the sleeve 11, and the open end of the sac 14 (the right end of the sac 14 shown in fig. 3) is tightly and sealingly connected to the first end of the plunger 12, in particular, the open end of the sac 14 is fixedly connected to the first end of the plunger by means of a press ring 163. The throttling element 13 includes a base 131 and a tube structure 132 fixedly connected to or integrally formed with the base 131, the base 131 is disposed at the closed end of the sac 14, and a portion of the tube structure 132 is inserted into the second chamber 122. The tube structure 132 is provided with a plurality of damping holes 133 (refer to fig. 4), the inner cavity of the sac 14 and/or the second chamber 122 is filled with hydraulic oil 4 as a fluid, when the plunger 12 slides in the first chamber 112 of the sleeve 11, a part of the plurality of damping holes 133 is in an open/closed state, and the hydraulic oil 4 can flow back and forth in the sac 14 and the second chamber 122 through the damping holes 133 in the open state.

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. The plurality of damping holes 133 are disposed on the outer wall of the tube structure 132 along the axial direction of the tube structure 132, and the axes of the damping holes 133 and the axes of the tube structure 132 form an included angle, it should be noted that the distribution density of the damping holes 133 on the tube structure may be uniform or non-uniform, the apertures of the individual damping holes 133 may be the same or different, and the included angles between the axes of the damping holes 133 and the axes of the tube structure 132 may be the same or different. Preferably, the tube structure 132 is provided with two rows of damping holes 133 with substantially the same aperture, and the angle between the axis of each damping hole 133 and the axis of the tube structure 132 is 90 °. The outer edge of the base 131 in the circumferential direction matches the inner wall of the first chamber 112, for example, the first chamber 112 is a cylindrical cavity, the base 131 is a cylindrical structure, and the diameter of the cross section of the cylindrical structure is approximately equal to the diameter of the cross section of the cylindrical cavity.

Still referring to fig. 3, the right end of the tube structure 132 is provided with a sealing cap 134, the sealing cap 134 is fixed to the right end of the tube structure 132 by means of screw connection, the inner cavity of the tube structure 132 is provided with a sliding block 135 capable of freely sliding along the axial direction, and the middle part of the sliding block is provided with a communication hole 1351 along the axial direction. Obviously, the fixation between the cover and the tube structure can be realized by ultrasonic welding, scarf joint, clamping and the like in addition to the threaded connection. Preferably, a sealing structure such as a sealing ring or a sealing ring is provided at the joint of the cap and the pipe structure.

And the damping holes of the tube structure are divided into two parts by taking the pressing ring as a boundary, namely a first part in the inner cavity of the sac and a second part in the second chamber, wherein the number and/or the density and/or the aperture and/or the angle of the 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, the damping force during the compression process is smaller than that during the extension process when the plunger compresses and extends for the same distance, and vice versa, so that different damping characteristics of the plunger during the compression stroke and the extension stroke are realized.

If not set up the closing cap, hydraulic oil flows between fluid bag and second chamber through the inner chamber of the damping orifice of first portion and tubular structure, because the size of middle part body is great, therefore throttle damping is very weak, at the in-process of oil feed/oil extraction, becomes the effect of damping unobvious. By the arrangement of the cover, during the leftward movement of the plunger, the hydraulic oil flows into the pipe structure through the damping hole of the first portion, flows to the radial gap between the plunger and the throttling element through the damping hole of the second portion, and further flows into the second chamber through the radial gap. As the tube structure is inserted into the plunger to a greater depth in the second chamber, the number of damping holes in the first part is smaller and greater, and the number of damping holes in the second part is greater and greater, the hydraulic oil is more difficult to flow from the inner cavity of the sac into the second chamber, i.e. the damping force generated by the shock absorber is greater and greater, and vice versa. In a word, the damping force generated by the shock absorber of the invention is increased along with the increase of the vibration amplitude, thereby optimizing the vibration reduction performance of the shock absorber, and obviously achieving the effect of noise reduction on the basis of vibration reduction.

When the viscosity of the fluid is higher, the difficulty that the fluid in the liquid bag is extruded into the second chamber through the radial gap and the fluid in the second chamber is extruded into the inner cavity of the tube structure through the radial gap is increased, at the moment, a porous structure can be arranged on the sealing cover, which is equivalent to greatly increasing the density of the damping holes of the second part, so that when the plunger compresses and extends for the same distance, the damping force in the compression process is greater than that in the extension process, and the plunger has different damping characteristics in the compression stroke and the extension stroke. It is understood that the pore structure may be single or porous, the distribution of porosity may be uniform or non-uniform, and the pore sizes may be the same or different.

Note that the communication holes 1351 on the slider may be in a single hole or a porous form, and the communication holes 1351 may be omitted. In the case of the omission of the communication hole, the slider functions to: when the shock absorber receives sudden impact or the vibration amplitude of the impact force is large, the throttling element is bound to receive the large impact force, and the impact force enables the sliding block to freely slide in the inner cavity of the tube structure, so that the shock absorber is prevented from suddenly and completely completing compression or extension stroke in a short time, time for achieving vibration reduction and noise reduction of the shock absorber is obtained, and the stability of the washing machine in the vibration elimination process is improved. And the movement of the sliding block can also adjust the number of (liquid inlet and outlet) damping holes, so that the purpose of variable damping of the shock absorber is realized. Obviously, in order to prevent the sliding block from sliding out of the tube structure, a limit structure is required to be additionally arranged on the tube structure to limit the moving range and the displacement of the sliding block. If the left side and the right side of the sliding block are both provided with the limiting structures, the left wall of the inner cavity of the tube structure can be used as the limiting structure on the left side, and the sealing cover is used as the limiting structure on the right side. In the case where the slider is provided with the communication hole, hydraulic oil can be communicated in the pipe structure through the communication hole.

It will be appreciated that the cover may be provided at any axial position of the tubular structure other than at the end of the tubular structure, i.e. in the inner cavity of the tubular structure, the damping hole of the second part being the part between the pressure ring and the cover. Obviously, in this case, in order to achieve a flow of hydraulic oil between the inner chamber of the sac and the second chamber, the cover should be located to the right of the tube structure, i.e. always in the second chamber from the beginning to the end. In the case where the closure is provided at the end of the tube structure, the hole structure is a single hole and the hole diameter of the hole structure is large, the closure is substantially shaped as a stopper ring extending inwardly from the end of the right end of the tube structure. It can be seen that the aforementioned sealing cover without the hole structure, the sealing cover with the hole structure, and the retaining ring with the inward extending end portion can be used as a limiting structure for limiting the sliding block from sliding out of the throttling element.

In order to reduce noise generated by the air compression of the plunger during the reciprocating movement, a noise-deadening hole 113 is provided in the sleeve, specifically, a noise-deadening hole is provided in a portion where the sleeve and the plunger 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. In addition, in order to increase the strength of the sleeve, a transverse rib 114 may be provided in the axial direction at a portion of the sleeve adjacent to the plunger 12, or a ring-shaped rib 114 may be circumferentially wound.

In order to ensure the sealing performance between the throttle 13 and the plunger 12 and between the throttle 13 and the sliding block 135, a first sealing structure may be disposed between the tube structure 132 and the first end of the plunger 12, and a second sealing structure capable of separating an inner cavity of the tube structure may be disposed between the tube structure 132 and the sliding block 135, and the structures of the first sealing structure and the second sealing structure may be the same or different. Referring to fig. 3, taking the second sealing structure as an example, an annular sealing groove may be provided on an inner wall of the pipe structure 132 or an outer wall of the slider 135, and an O-ring may be embedded in the annular sealing groove. Further preferably, the axial length of the annular sealing groove can be set to be larger than the diameter of the O-shaped sealing ring so that the O-shaped sealing ring can slide in the annular sealing groove, and the vibration damping performance of the shock absorber can be further optimized.

Specifically, on the one hand, the sealing between the tube structure 132 and the slider 135 can be realized by the arrangement of the O-ring, it is ensured that the hydraulic oil 4 does not flow through the gap between the outer wall of the slider and the tube structure 132, but flows between the liquid bag 14 and the second chamber 122 only through the damping hole 133 and the communication hole 135 in the middle of the slider, the problem that the fit gap between the tube structure 132 and the slider 135 is too large due to machining precision, abrasion and the like, and then the damping force of the shock absorber 1 is greatly reduced due to the flow of the hydraulic oil 4 through the gap is avoided, and the damping effect of the shock absorber 1 is improved. On the other hand, the arrangement of the annular sealing groove with the larger axial length can realize that the shock absorber 1 provides different damping forces under different vibration conditions. Specifically, when the washing machine generates small vibration, the O-ring can make a small part of hydraulic oil 4 enter the annular sealing groove in a sliding manner in the annular sealing groove, so that the resistance of the hydraulic oil 4 in the liquid bag 14 and the second chamber 122 during reciprocating flow is reduced, the damping force provided by the shock absorber 1 is also reduced during small vibration, the small vibration of the drum 3 transmitted to the shell of the washing machine through the shock absorber 1 is reduced, the stable operation of the washing machine is ensured, and the noise is low. When the washing machine generates large vibration, because the vibration is large and the vibration speed is high, the O-shaped sealing ring does not move relative to the annular sealing groove basically at the moment, which is equivalent to that the O-shaped sealing ring is fixedly connected in the annular sealing groove, and the resistance of the reciprocating flow of the hydraulic oil 4 in the liquid bag 14 and the second chamber 122 is basically unchanged, so that the shock absorber 1 can provide relatively large damping force during the large vibration, and the vibration generated by the washing machine is reduced quickly.

On this basis, in order to further optimize the damping performance of the shock absorber, a spring may also be arranged in the second chamber 12, the two ends of the spring abutting against the right end of the tube structure of the orifice and the right end of the second chamber, respectively. The action of the spring comprises: the base at the left end of the throttling element is ensured to be reset, so that the problem that the throttling element stays randomly due to throttling resistance is avoided; the stored vibration energy of the spring may be further damped to dissipate vibrations. It can be understood that the spring can be a cylindrical spring with the same diameter, or can be a (middle diameter is large, two ends diameter is small) or a special-shaped spring with the diameter gradually increasing or decreasing from one end to the other end, under the condition that the right end of the pipe structure is provided with the sealing cover and the sliding block is arranged in the inner cavity of the pipe structure, the left side of the spring can abut against the sealing cover to restrict the damping force of the whole throttling element, or abut against the sliding block to restrict the damping force of the sliding block in the pipe structure, and in addition, the left side of the inner cavity of the pipe structure and the sliding left side can also be provided with the spring. It will be appreciated that the spring may be replaced by other elastic members such as a plate spring, an elastic block, etc.

To further secure the positional relationship between the base 131, the closed end of the sac 14, and the first end of the sleeve, a fixing member may be provided to the shock absorber 1, for example. Referring to fig. 5, 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, a fixing hole 173 is disposed on the clamp 171, the clamp is fixed on the sleeve of the shock absorber by matching with the fixing hole 173 through screws and the like, and 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. It is further preferred that a certain free stroke space may be provided between the left end of the first chamber 112 and the left side of the base 131 defined by the jaws to further optimize the damping performance of the shock absorber. It will be appreciated that to ensure the assembly process is practicable, the band should be a non-closed ring with an axial gap, i.e. the band is provided with an opening 174.

Referring to FIG. 4, FIG. 4 is an enlarged view of a portion of FIG. 3 at A showing one embodiment of a pressure ring seal. As shown in fig. 4, 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 first end (namely the left end) of the plunger in a tight fit mode, and the opening end of the sac is clamped between the clamping ring and the first end of the plunger. Obviously, the compression ring and the plunger can be fastened through bolts, ultrasonic welding, bonding, buckles and the like.

With further reference to fig. 4, the open end of the sac 14, which is a cylindrical structure, includes an axial clamping section and a radial clamping section, in the first embodiment of the compression ring seal, 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 the axial annular space formed by the compression ring and the tube structure, the radial clamping section of the sac is clamped in the radial annular space formed by the first annular groove 164 and the second annular groove 165, and the compression ring is fixed to the left end of the plunger 12 by the close fit of the stepped surface 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.

Meanwhile, in the process that the plunger reciprocates relative to the throttling element, the axial clamping section of the opening end of the liquid bag enables the gap between the plunger and the throttling element to be sealed, namely the axial clamping section simultaneously plays a role in dynamic sealing, and therefore the throttling damping effect is effectively enhanced. In this way, the axial clamping section of the open end of the sac corresponds to the first sealing structure described above. In order to ensure the sealing between the plunger and the throttle member, a redundant sealing structure may be added near the right side of the pressure ring, in which case the damping holes of the first and second portions are bound by the redundant sealing structure in a strict sense.

In another embodiment of the pressure ring seal, a hollow second annular boss may extend radially inwardly of the first annular boss 161, in particular at the left end of the plunger, the first annular boss dividing the portion radially outwardly of the second annular boss into an inner first portion for sealing and an outer second portion for positioning, the axial clamping section of the sac being clamped in an axial annular space formed by the pressure ring and the tube structure, the radial clamping section of the sac being clamped in a radial annular space formed by the step surface and the first portion, the pressure ring being fixed to the left end of the plunger by the close fit of the step surface and the second portion. 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, and the radial clamping section of the opening end of the sac forms a thickened part and is pressed 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.

It can be seen that in the shock absorber of the present invention, the essence of the pressure ring seal is that the first annular boss 161 divides the end face of the first end of the plunger into a radially outer portion and a radially inner portion, the radially outer portion is mainly positioned by the tight engagement of the step and the step, and the radially inner portion is mainly used for fixing and sealing the sac.

In summary, in the shock absorber of the present invention, 1) since the closed end of the sac 14 is fixedly connected to the sleeve 11 through the base and the (clip, claw) and the closed end of the sac 14 is fixedly connected to the plunger 12 through the pressing ring, the plunger 12 will stretch/compress the sac 14 and the sac 14 will provide an elastic damping force due to the stretching/compression during the reciprocating movement of the plunger 12 in the first chamber 112 of the sleeve 11. Specifically, as the stroke of the plunger 12 away from the equilibrium position in the sleeve 11 increases, the elastic damping force applied thereto also increases, thereby enhancing the vibration damping effect of the shock absorber 1; 2) since the orifice 13 is provided in the liquid bladder 14 and a portion of the tube structure 132 of the orifice 13 is inserted into the second chamber 122, the number of the damping holes 133 in the opened state is changed at any time during the reciprocating movement of the plunger 12 in the first chamber 112 of the sleeve 11, and the damping force generated through the damping holes 133 is changed accordingly, thereby further enhancing the vibration damping effect of the shock absorber 1; and 3) the throttling element 13 realizes sealing with the plunger 12 through (an annular sealing groove and an O-shaped sealing ring), so that the hydraulic oil 4 only flows among the liquid bag 14, the pipe structure and the second chamber 122 through the damping hole on the throttling element in the process that the plunger 12 slides relative to the sleeve 11, and the problem of failure of the shock absorber 1 caused by leakage of the hydraulic oil 4 is avoided. In addition, the circumferential outer edge of the base 131 is matched with the inner wall of the first chamber 112 and the arrangement of the (clamping hoop and clamping jaw) also enables the base 131 to limit the horizontal position of the pipe structure 132, even if the base can be stably positioned on the left side of the first chamber (only can 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 situation that the shock absorber 1 fails due to the offset of the pipe structure 132 in the working process of the throttling element 13 is avoided.

Compared with the conventional shock absorber which performs vibration reduction by using friction force, the damping force generated by the shock absorber 1 of the invention is not constant damping force at any moment but changes along with the amplitude of vibration by arranging the liquid bag and the throttling element, and the larger the amplitude of vibration is, the larger the damping force generated by the shock absorber 1 for resisting the vibration is. Moreover, the shock absorber 1 of the present invention does not have the problem that the shock absorber 1 fails after a period of operation. That is, the damper of the present invention realizes continuous variation of damping force, enhances the vibration reduction effect of the damper, increases the service life cycle of the damper, improves the reliability of the damper, and significantly improves the use experience of users when the damper is used in a drum washing machine.

Here, it should be noted that the number and diameter of the damping holes 133 are not limited in this embodiment, and the number and diameter of the damping holes 133 are different for different models of shock absorbers 1. For example, for a relatively small shock absorber 1, the diameter of the damping hole 133 may be in the thickness range of a few tenths of a millimeter to a few millimeters; for a relatively large damper 1, the diameter of the valve plate may be in the range of several millimeters to ten and several millimeters.

It will be appreciated by those skilled in the art that the preferred arrangement of the damping holes 133 is merely illustrative of the principles of the present invention and is not intended to limit the scope of the invention, which can be modified in any manner by those skilled in the art to suit a more specific application without departing from the principles of the present invention. For example, the cross-section of the orifice 133 may also be elliptical or rectangular; the base 131 and the tube structure 132 can be fixedly connected in a threaded manner; the angle between the axis of the damping orifice 133 and the axis of the tube structure 132 may be any non-parallel angle, such as 45 ° or 60 ° between the axis of the damping orifice 133 and the axis of the tube structure 132 in the horizontal leftward direction.

The operation of the damper 1 of the present invention in a drum washing machine will be briefly described with reference to fig. 3 by taking the case where the washing machine generates large vibration as an example.

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 damping holes 133 in the opening state on the throttling element 13 decrease, the hydraulic oil 4 is squeezed, the inner cavity of the fluid bag 14 generates positive pressure, the hydraulic oil 4 flows from the inner cavity of the fluid bag 14 to the second chamber 122 through the fewer damping holes 133 in the opening state, 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 slowed down, 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 is increased, the damping holes 133 in the opening state on the throttling element 13 are increased, the hydraulic oil 4 is extruded, the inner cavity of the liquid bag 14 generates negative pressure, the hydraulic oil 4 flows from the second cavity 122 to the inner cavity of the liquid bag 14 through the plurality of damping holes 133 in the opening state, the hydraulic oil 4 generates 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 vibration reduction and noise reduction effects are achieved.

And, the setting of clamping ring and (annular seal groove, O type sealing washer) has avoided appearing following problem effectively: due to the fact that the fit clearance between the plunger and the throttling piece is too large due to the machining precision of the shock absorber, abrasion and the like, hydraulic oil easily flows in the too large clearance, and therefore the throttling resistance of the shock absorber is greatly reduced. That is, due to the arrangement of the pressing ring and the (annular sealing groove, O-ring), the hydraulic oil 4 in the second chamber flows into the inner cavity of the liquid bag 14 only through the plurality of damping holes 133 in the open state, and the precision of the damping force provided by the shock absorber is ensured.

Referring again to fig. 1, the present invention also provides, in another aspect, a washing machine including a casing 2 and a drum 3 disposed in the casing 2, the drum 3 being supported on the casing 2 by two dampers 1 of the present invention. Of course, the number of the dampers 1 in the drum washing machine is not constant, and three, four or more dampers may be provided in the drum washing machine, and at least one of the dampers is the damper 1 of the present invention.

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 protection 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 the drum washing machine, such as a pulsator washing machine, a clothes dryer, a shoe washing machine, and the like, which have the same or similar vibration damping structure.

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; and

a sac disposed in the first chamber, an open end of the sac being secured to a first end of the plunger;

wherein a throttle member is provided in the sac, the throttle member being partially inserted into the second chamber, the throttle member being provided with a plurality of orifice holes, a part of which are in an open/closed state with sliding of the plunger, the first chamber and the second chamber being communicated with each other via the orifice holes in the open state;

wherein the inner cavity of the sac and/or the second chamber are filled with fluid, and a silencing hole is arranged at the part of the sleeve, which is jointed with the plunger.

2. The shock absorber according to claim 1, wherein the orifice member comprises a base and a tube structure integrally formed or fixedly connected to the base, the base being disposed at an end of the sac remote from the plunger, a portion of the tube structure being inserted into the second chamber.

3. The shock absorber according to claim 2, wherein the plurality of damping holes are uniformly or non-uniformly arranged on the outer wall of the tube structure along the axial direction of the tube structure, and the axes of the damping holes form an included angle with the axis of the tube structure.

4. The shock absorber according to claim 2, wherein said seat is disposed at an end of said first chamber remote from said plunger, and a circumferential outer edge of said seat mates with an inner wall of said first chamber.

5. The shock absorber as claimed in claim 4, further comprising a clamp of a cylindrical structure and a plurality of clamping jaws disposed inside the clamp, wherein the sleeve is provided with clamping holes corresponding to the clamping jaws, and the clamp clamps the base in the first chamber in a manner that the clamping jaws are matched with the clamping holes.

6. A shock absorber according to claim 5 wherein a free stroke space is provided between the first end of the first chamber and the pawl, the base being arranged to be movable within the free stroke space.

7. The damper according to claim 2, wherein a cap is provided at an end of the tube structure adjacent to the plunger, and a slider is provided in the inner cavity of the tube structure, the slider being configured to freely slide in the inner cavity of the tube structure.

8. The shock absorber according to any one of claims 1 to 7, wherein a portion of the sleeve adjacent to the plunger is provided with a reinforcing rib.

9. A laundry treatment apparatus comprising a casing and a washing drum disposed in the casing, the washing drum being supported in the casing by a plurality of shock absorbers, characterized in that at least one of the shock absorbers is a shock absorber according to any one of claims 1 to 8.