CN111197239B

CN111197239B - Drum washing machine

Info

Publication number: CN111197239B
Application number: CN201811377498.8A
Authority: CN
Inventors: 马双双; 伊藤; 金学峰; 国强
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2022-06-14
Anticipated expiration: 2038-11-19
Also published as: CN111197239A

Abstract

The invention provides a drum washing machine, which is provided with a box body and an outer barrel arranged in the box body, wherein the outer barrel is hoisted in the box body through four vibration reduction hoisting rods; two vibration absorbers are arranged between the outer cylinder and the box body, and the vibration absorbers are positioned on two sides of the outer cylinder and are arranged in a staggered mode. The suspension position of the suspension rod is adjusted, so that a stable state of static balance can be achieved under the condition that all balance weights are removed from the drum washing machine, and the vibration damping system can provide higher rigidity due to the existence of the suspension rod; the arrangement of the vibration absorber not only provides certain damping for the drum washing machine, but also can be well matched with the balance of the position systems of the four suspenders. The drum washing machine of the invention omits all counter weights, and ensures the vibration damping effect of the system by optimizing the vibration damping system. The drum washing machine has the advantages of light weight, low cost and good vibration reduction effect.

Description

Drum washing machine

Technical Field

The invention belongs to the technical field of washing machines, and particularly relates to a drum washing machine with good vibration reduction effect and light weight.

Background

An inner barrel and an outer barrel are arranged in a box body of the drum washing machine, and the outer barrel is assembled with the box body through a shock absorber and a spring. In order to achieve a good vibration damping effect, the washing machine needs to be provided with a heavy-weight balancing weight which accounts for about more than 40% of the weight of the suspension system, so that the weight of the whole suspension system is very heavy, the weight of the washing machine is very heavy, and the resonance and steady-state vibration effects of the vibration damper are poor due to the adoption of the conventional vibration damping system with the combination of the spring and the vibration damper.

How to provide a drum washing machine which can not only reduce the balance weight, but also ensure the vibration reduction effect is a technical problem to be solved urgently by technical personnel in the field at present.

At present, a hanger rod device of a washing machine comprises a rod piece, a hanger rod seat, a ball seat, a spring and a spring seat, wherein the hanger rod seat is arranged at the top end of the rod piece, the spring seat, the spring and the ball seat sequentially penetrate through the rod piece from the bottom end of the rod piece, and a friction plate is sleeved in the ball seat; a hinge plate is arranged on a box corner of the washing machine, and a convex spherical surface of the lifting rod seat is matched with a spherical surface groove of the hinge plate on the box corner; the bottom end of the outer cylinder is also provided with a spherical groove, and the convex spherical surface of the ball seat is matched with the spherical groove at the bottom end of the outer cylinder, so that the dewatering inner cylinder and the outer cylinder are hung on four box corners at the upper part of the outer box body.

When the washing machine works, the vibration generated by the outer barrel can cause the ball seat to move up and down, and the ball seat further generates damping force through the reciprocating friction of the friction plate and the rod piece, so that the vibration is inhibited, and the aim of improving the vibration noise level of the whole machine is fulfilled.

However, in the washing machine in the dehydration transient stage, the internal system has large vibration, and the suspender device is required to provide relatively large damping force to inhibit the internal system vibration; in the dehydration steady-state stage, the internal system has less vibration, and the suspender device is required to provide relatively small damping force to isolate vibration; the suspender device can only provide single damping force through friction between the friction plate and the rod piece, and the friction contact area is small; when the suspender device is assembled, the surface of the ball seat can be greased to improve the lubricating condition; therefore, in the dehydration transient stage with large vibration of the internal system, the damping force of the suspender device can often difficultly inhibit the vibration of the system in operation; in the dehydration steady state stage with small vibration of the internal system, the suspension rod device can move up and down under the action of the viscosity of the grease and the damping force of the suspension rod, and the problem of abnormal vibration noise occurs. The vibration reduction hanger rod of the washing machine generally achieves the vibration reduction effect by installing a spring on the rod piece, so that the vibration amplitude of the washing machine is large in the operation process, and the service life of the washing machine is easy to consume.

How to provide a jib device of washing machine to realize transient state dehydration and restrain the dual function of vibration and steady state dehydration isolation vibration, and then improve the vibration noise level of dehydration stage, avoid jib device drunkenness from top to bottom simultaneously, be present the technical problem that technical staff in the field had a urgent need to solve.

For the vibration absorber of the washing machine, because the washing machine has larger vibration at low speed and a resonance point, and the washing machine can stably run at high speed, the vibration absorbing requirements of the washing machine on the vibration absorber at low speed and high speed are different, and the vibration absorber is required to provide larger damping force when the vibration at low speed is large and provide smaller damping force when the vibration at high speed is small.

The known shock absorbers generally comprise a friction shock absorber and a free-stroke shock absorber, which have the following drawbacks:

a conventional friction damper is provided with a friction plate between a damper shaft and a damper cylinder, so that a damping force provided by the damper is not changed at a low speed or a high speed during dehydration of a washing machine, and the damping force provided by the damper may be slightly weakened at a high-speed friction condition for a long time. The vibration absorber can not change the damping force and can not meet the requirements of the washing machine on the damping force at low speed and high speed.

And the free stroke shock absorber changes the existence or nonexistence of damping force according to the relative vibration displacement between the shock absorber shaft and the shock absorber cylinder, when the friction plate reaches an end point position, the shock absorber is instantly increased from undamped to a state with damping force, the impact force is larger, and the washing machine has sudden change vibration and noise. Although the magnitude of the damping force of the shock absorber can be changed, the shock absorber generates large instantaneous vibration and generates large noise at the moment when the damping force is from the existence to the nonexistence and at the moment when the damping force is from the existence to the nonexistence.

Therefore, the existing vibration absorber has the problem that the existing vibration absorber cannot provide damping force matched with the rotating speed when the washing machine is at different rotating speeds.

Disclosure of Invention

The invention provides a drum washing machine aiming at the problems in the prior art, and aims to solve the technical problems of large weight and poor vibration damping effect of the drum washing machine.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a drum washing machine is provided with a box body and an outer drum arranged in the box body, wherein the outer drum is hoisted in the box body through a vibration reduction hoisting rod, and the vibration reduction hoisting rod is hoisted on a side panel of the box body at a position close to a rear panel; and a vibration damper is arranged between the outer cylinder and the box body, and the vibration dampers are positioned on two sides of the outer cylinder and are arranged in a staggered manner.

The vibration reduction hanging rod comprises a rod piece, a friction sheet plate fixed at the lower part of the rod piece and a hanging rod cylinder sleeved outside the rod piece and the friction sheet plate, wherein the inner side of the hanging rod cylinder is provided with a variable damping friction section matched with the periphery of the friction sheet plate; and the upper part and the lower part of the friction plate are both provided with damping springs.

According to the drum washing machine, the upper end of the inner side of the hanging rod cylinder is provided with the upper supporting seat, and the friction plate and the damping spring vibrate between the upper supporting seat and the bottom surface of the hanging rod cylinder.

The drum washing machine as described above, the damper spring includes a first spring disposed at an upper end of the friction plate to extend upward and a second spring disposed at a lower end of the friction plate to extend downward; the upper end of the first spring is in a free state, and the lower end of the second spring is in a free state.

The roller washing machine is characterized in that the upper end of the friction sheet plate is provided with a plurality of first springs which are symmetrically arranged or axially and uniformly distributed.

According to the drum washing machine, the first spring and the second spring are coaxially arranged in pairs up and down, and the rigidity of the coaxially arranged first spring and the rigidity of the coaxially arranged second spring are the same.

The drum washing machine as described above, the damping spring includes a third spring disposed between the upper support seat and the friction plate and sleeved on the rod, the upper end of the third spring is disposed on the upper support seat, and the lower end is disposed on the friction plate.

According to the drum washing machine, the variable damping friction section comprises a cylindrical first friction section and second friction sections which are symmetrically arranged at the upper side and the lower side of the first friction section, and the damping force between the friction plate and the second friction sections is larger than the damping force between the friction plate and the first friction sections.

The drum washing machine as described above, the inner diameter of the second friction segment is smaller than the inner diameter of the first friction segment, and the inner diameter of the second friction segment is smaller than the outer diameter of the friction sheet plate.

According to the drum washing machine, the variable damping friction section further comprises two third friction sections formed by extending along the tail end of the second friction section in the direction far away from the first friction section, the two third friction sections are arranged in an up-down symmetrical mode, and the damping force between the friction plate and the third friction sections is larger than the damping force between the friction plate and the second friction sections.

The roller washing machine comprises a shock absorber cylinder and a shock absorber shaft arranged in the shock absorber cylinder, wherein a friction plate is arranged on the shock absorber shaft, a damping piece is arranged on the shock absorber cylinder, the friction plate generates damping force when contacting with the damping piece, and the damping piece comprises a variable damping friction section and a fixed damping friction section; when the friction plate is contacted with the variable damping friction section, the contact area of the variable damping friction section and the friction plate is gradually increased from the variable damping friction section to the fixed damping friction section; when the friction plate is contacted with the fixed damping friction section, the contact area between the fixed damping friction section and the friction plate is unchanged.

In the drum washing machine, the constant damping friction section is cylindrical, and the variable damping friction section is saw teeth arranged at one end of the cylindrical constant damping friction section.

In the drum washing machine, the saw teeth are triangular or trapezoidal.

The drum washing machine as described above, the damping member includes a first damping member and a second damping member, the first damping member and the second damping member each include a variable damping friction section and a fixed damping friction section, the variable damping friction section of the first damping member is disposed opposite to the variable damping friction section of the second damping member, and the friction plate is disposed between the first damping member and the second damping member.

In the drum washing machine, the damper cylinder is provided with the second friction plate for contacting with the damper shaft.

In the drum washing machine, the bottom of the damper cylinder is provided with the damper spring for contacting the damper shaft.

In the drum washing machine, the connection part of the vibration damping suspender and the box body is provided with the vibration damping pad.

Compared with the prior art, the invention has the advantages and positive effects that: the vibration damping system of the drum washing machine comprises four suspension rods and two vibration dampers, wherein an outer cylinder is hoisted in a box body through the four vibration damping suspension rods, and the suspension rods are hoisted on a side panel of the box body at a position close to a rear panel; two vibration absorbers are arranged between the outer cylinder and the box body, and the vibration absorbers are positioned on two sides of the outer cylinder and are arranged in a staggered mode. The suspension position of the suspension rod is adjusted, so that a stable state of static balance can be achieved under the condition that all balance weights are removed from the drum washing machine, and the vibration damping system can provide higher rigidity due to the existence of the suspension rod; the arrangement of the vibration absorber not only provides certain damping for the drum washing machine, but also can be well matched with the balance of the position systems of the four suspenders. The drum washing machine of the invention omits all counter weights, and ensures the vibration damping effect of the system by optimizing the vibration damping system. The drum washing machine has the advantages of light weight, low cost and good vibration reduction effect.

According to the vibration reduction suspender provided by the invention, the variable damping friction section arranged on the inner side of the suspender cylinder and the friction sheet plate are used for providing damping, so that on one hand, the contact area between the friction sheet plate and the suspender cylinder is larger, and larger damping force is provided; on the other hand, the damping force is generated on the inner periphery of the hanging rod cylinder, so that the stress balance is facilitated, and the shaking is avoided; on the other hand, the variable damping friction section on the inner side of the suspender cylinder can be arranged to provide smaller damping or provide no damping force when the vibration amplitude is smaller; when the vibration amplitude is large, a large damping force is provided; the larger the vibration amplitude is, the larger the damping force is provided, so that the vibration can be quickly inhibited, and the stable operation in the steady-state dehydration can be ensured; through the damping springs arranged above and below the friction plate, the friction plate is prevented from colliding with the suspender cylinder, and the damping effect is ensured.

The vibration absorber provided by the invention can provide large resistance when the vibration amplitude is large when the washing machine runs at a low speed, can provide large resistance when the vibration amplitude is large when the washing machine runs at a medium speed, can provide large resistance when the vibration amplitude is large, can provide small resistance when the vibration amplitude is minimum when the washing machine runs at a high speed, can obstruct the normal running of the washing machine when the washing machine vibrates very little, and can even reduce the resistance provided by the vibration absorber to zero. The vibration damper can change the resistance according to the vibration amplitude of the washing machine, so that the resistance is matched with the vibration, the vibration is restrained, and the noise is reduced.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a vibration damping hanger of a washing machine according to the present invention;

FIG. 2 is an enlarged cross-sectional view of the boom barrel of FIG. 1;

FIG. 3 is a schematic structural view of the boom cylinder of FIG. 2;

FIG. 4 is an enlarged schematic view of the boom cylinder of FIG. 2 with the boom cylinder removed;

FIG. 5 is a schematic view of the boom cylinder housing of FIG. 1 with the boom cylinder housing removed;

fig. 6 is an enlarged view of the lower part of fig. 5.

Fig. 7 is an external structural view of a shock absorber according to an embodiment of the present invention.

Fig. 8 is a sectional view taken along the line of fig. 7B-B.

FIG. 9 is a cross-sectional view of a shock absorber according to an embodiment of the present invention in a first condition.

Figure 10 is a cross-sectional view of a shock absorber in a second condition in accordance with an embodiment of the present invention.

FIG. 11 is a cross-sectional view of a shock absorber in a third condition in accordance with an embodiment of the present invention.

FIG. 12 is a schematic view of a damping member and friction member according to an embodiment of the present invention.

Fig. 13 is a schematic view of a washing machine according to an embodiment of the present invention.

FIG. 14 is a schematic view of the assembly of the outer tube with the hanger bar and the shock absorber in accordance with the preferred embodiment of the present invention.

Fig. 15 is a side view of fig. 14.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the positional relationships shown in the drawings, and the side close to the user in the normal use state of the product is "front", and the side away from the user is "rear". The terminology is for the purpose of describing the invention only and is for the purpose of simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and is not to be considered limiting of the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 13 to 15, an embodiment of the drum washing machine according to the present invention is a drum washing machine having a cabinet 18 and an outer tub 19 disposed in the cabinet 18, wherein the outer tub 19 is suspended in the cabinet 18 by a vibration damping hanger 111, and the vibration damping hanger 111 is suspended on a side panel of the cabinet 18 at a position close to a rear panel. A damper 110 is provided between the outer cylinder 19 and the box 18, and the dampers 110 are positioned on both sides of the outer cylinder 19 and are arranged in a staggered manner. The outer cylinder 19 is suspended in the box 18 by 2, 4, 6 vibration-damping hanger rods 111, and the vibration-damping hanger rods 111 are distributed on both sides of the outer cylinder 19, preferably, the outer cylinder 19 is suspended in the box 18 by 4 vibration-damping hanger rods 111, and the 4 vibration-damping hanger rods 111 are symmetrically distributed on both sides of the outer cylinder 19 in the embodiment. In this embodiment, two dampers 110 are preferably disposed between the outer cylinder 19 and the box 18, the dampers 110 are disposed on two sides of the outer cylinder 19 and are offset, and the positions of the two dampers 110 are preferably diagonal positions of the outer cylinder 19.

Since the washing machine removes all the counterweights, the center of gravity is shifted to the rear side, the suspension position of the vibration-damping hanger 111 is adjusted, and the suspension position of the vibration-damping hanger 111 is shifted to the rear position in the middle of the side panel, so that a stable state of static balance can be achieved. The springs in the shock boom are compression springs and thus the shock boom 111 may provide greater stiffness.

The joint of the damping hanger 111 and the box 18 is provided with a damping pad, which can play a role of vibration damping.

The number of the shock absorbers 110 is reduced to two from the original four shock absorbers 110, the two shock absorbers 110 are arranged in a staggered mode, preferably, the two shock absorbers 110 are arranged at the diagonal positions of the outer cylinder, certain damping is provided for the washing machine, and the four shock absorber suspenders can be well matched to maintain the balance of the system.

Through the structural position collocation of using damping jib, damping pad and shock absorber, make whole washing machine under the circumstances that does not have the counter weight, still have better damping effect.

Referring to fig. 1-6, which are one embodiment of the damping hanger rod for the washing machine, the damping hanger rod for the washing machine comprises a rod member 1, a friction sheet plate 2 fixed at the lower part of the rod member 1, and a hanger rod cylinder 3 sleeved outside the rod member 1 and the friction sheet plate 2, wherein an outer cylinder of the washing machine is hung on the hanger rod cylinder 3, and the upper end of the rod member 1 is hung on an angle plate of a box body; the inner side of the suspender cylinder 3 is provided with a variable damping friction section 31 matched with the periphery of the friction sheet plate 2; the upper and lower parts of the friction plate 2 are provided with damping springs. In the working process of the washing machine, the vibration of the outer cylinder drives the hanging rod cylinder 3 to vibrate on the rod piece 1, so that the friction sheet plate 2 moves up and down relative to the hanging rod cylinder 3; the damping force is provided by the variable damping friction section arranged on the inner side of the friction sheet plate 2 and the suspension rod barrel 3, so that on one hand, the contact area between the friction sheet plate 2 and the suspension rod barrel 3 is larger, and larger damping force is provided; on the other hand, the damping force is generated on the inner periphery of the suspender cylinder 3, which is beneficial to the balance of stress and avoids the shake; on the other hand, the variable damping friction section on the inner side of the suspender cylinder 3 can be arranged to provide less damping or no damping force when the vibration amplitude is smaller; when the vibration amplitude is large, a large damping force is provided; the larger the vibration amplitude is, the larger the damping force is provided, so that the vibration can be quickly inhibited, and the stable operation in the steady-state dehydration can be ensured; through the damping springs arranged above and below the friction plate 2, the friction plate 2 is prevented from colliding with the suspender cylinder 3, and the damping effect is ensured.

In this embodiment, the upper support seat 33 is disposed at the upper end of the inner side of the boom cylinder 3, the upper support seat 33 is provided with an extending hole 331 for the rod 1 to extend into, the lower end surface of the upper support seat 33 is a stop plane 332 perpendicular to the extending hole 331, and the friction plate 2 and the damping spring vibrate between the upper support seat 33 and the bottom surface 32 of the boom cylinder 3, specifically between the lower end surface of the upper support seat 33 and the bottom surface 32. By arranging the upper supporting seat 33 and arranging the lower end surface of the upper supporting seat 33 as the stopping plane 332 perpendicular to the extending hole 331, the lower end surface of the upper supporting seat 33 can contact with the damping spring, and a damping function is provided.

Referring to fig. 2, the damping spring includes a first spring 4 provided at an upper end of the friction plate 2 to extend upward and a second spring 5 provided at a lower end of the friction plate 2 to extend downward; the upper end of the first spring 4 is in a free state, and the lower end of the second spring 5 is in a free state. Namely, the lower end of the first spring 4 is fixedly arranged with the friction plate 2, and the upper end of the second spring 5 is fixedly arranged with the friction plate 2; when the rod member 1 moves upward relative to the rod hanging cylinder 3, if the vibration amplitude is large, the upper end of the first spring 4 contacts with the upper support seat 33, and the first spring 4 is compressed between the friction plate 2 and the upper support seat 33; then the first spring 4 releases the elastic force, so that the friction plate 2 moves downwards relative to the hanger rod cylinder 3, the lower end of the second spring 5 is contacted with the bottom surface 32 of the hanger rod cylinder 3, and the second spring 5 is tightly pressed between the friction plate 2 and the bottom surface 32 of the hanger rod cylinder 3; meanwhile, when the friction plate 2 moves up and down relative to the hanging rod cylinder 3, the friction plate 2 is in contact with the variable damping friction section, so that the amplitude is reduced. In the steady state operation state of the washing machine, the amplitude is reduced, the relative movement amplitude of the friction plate 2 in the hanger rod cylinder 3 is small, the upward movement displacement of the friction plate 2 relative to the hanger rod cylinder 3 is small, and under the condition that the upper end of the first spring 4 is not in contact with the upper supporting seat 33, the friction plate 2 starts to move downward relative to the hanger rod cylinder 3, namely the first spring 4 is not compressed and is in a free state; thus, it is required that the distance between the upper end of the first spring 4 and the upper support base 33 is set to be greater than the amplitude of the washing machine in the steady operation state, that is, smaller than the distance of the upward movement of the friction plate 2 from the initial state to the boom housing 3. Similarly, the second spring 5 is also in a free state and does not contact the bottom surface 32 of the boom cylinder 3 in a steady-state operation state of the washing machine. Through setting up first spring 4 and second spring 5, when the relative jib barrel 3 of friction wafer board 2 vibrates from top to bottom, can avoid the collision of friction wafer board 2 and jib barrel 3 to and slow down the vibration.

The damping spring further comprises a third spring 6 arranged between the upper supporting seat 33 and the friction plate 2, the third spring 6 is sleeved on the rod piece 1, and the upper end of the third spring 6 is fixedly arranged on the upper supporting seat 33 and the lower end of the third spring is fixedly arranged on the friction plate 2. The third spring 6 gives the force which is applied to the friction plate 2 and moves towards the initial position relative to the lifting rod cylinder 3, and when the friction plate 2 is in the initial state, the third spring 6 is in an unstressed state; when the friction plate 2 moves upwards relative to the hanging rod cylinder 3, the third spring 6 is compressed, and provides elastic force to enable the friction plate 2 to have a downward movement tendency; when the friction plate 2 moves downward relative to the boom cylinder 3, the third spring 6 is stretched, providing a pulling force such that the friction plate 2 has a tendency to move upward.

When the washing machine starts to dewater, the vibration amplitude is generally large, the first spring 4, the second spring 5 and the third spring 6 play a role in vibration reduction, and the rigidity of the vibration reduction spring is the superposition of the rigidities of the first spring 4, the second spring 5 and the third spring 6; when the washing machine operates in a steady state, the first spring 4 and the second spring 5 are in a free state and do not play a role in damping vibration, only the third spring 6 plays a role in damping vibration, and the rigidity of the damping spring is the rigidity of the third spring 6. Therefore, when the vibration amplitude of the washing machine is large, the rigidity of the vibration reduction spring is large; can bear larger vibration impact and has better vibration reduction effect under the condition of large amplitude. When the vibration amplitude of the washing machine is small, the rigidity of the vibration reduction spring is small, a soft vibration reduction effect can be provided, and vibration is avoided.

In order to provide balanced force for the friction plate 2 by the first springs 4, a plurality of first springs 4 are symmetrically arranged or axially and uniformly distributed at the upper end of the friction plate 2, so that the friction plate 2 is prevented from being stressed and inclined on a plane. The friction plate 2 vibrates to have the same vertical amplitude, so the friction plate 2 is preferably arranged to receive the same elastic force of the damping springs in the vertical direction, specifically, the first spring 4 and the second spring 5 are arranged in pairs coaxially up and down, and the first spring 4 and the second spring 5 are arranged coaxially to have the same rigidity. The 1 installation back of jib has upwards the trend that leans out, and the first spring 4 compression volume in the outside is slightly little, sets up rigidity slightly bigger, can set up the direction upward rigidity increase that a plurality of first springs 4 are close to the box for whole damping jib is in stable condition. In this embodiment, six springs are provided, including a left first spring 4, a right first spring 4, two second springs 5 coaxially disposed up and down, and a third spring 6.

Referring to fig. 6, for stability and firmness of the first spring 4 after installation, a first spring seat 7 is arranged at the lower end of the first spring 4, the first spring seat 7 is fixed on the upper end surface of the friction plate 2, and the lower end of the first spring 4 is fixed on the first spring seat 7. A second spring seat 9 is arranged at the upper end of the second spring 5, the second spring seat 9 is fixed on the friction sheet plate 2, and the upper end of the second spring 5 is fixed on the second spring seat 9. A spring post 8 is arranged on the inner side of the first spring 4, the spring post 8 is fixed at the center of the first spring seat 7, the spring post 8 protrudes out of the second spring seat 9 and extends upwards, and the height of the spring post 8 protruding out of the second spring seat 9 is half of the height of the second spring 5; and the lower end of the spring post 8 is fixed to the second spring seat 9 through the friction plate 2. The spring column 8 is arranged, so that the first spring seat 7 and the second spring seat 9 are fixed conveniently; and facilitates the coaxial arrangement of the first and second spring seats 9, i.e. of the first and

second springs

4, 5; and the spring column 8 is arranged, so that the first spring 4 is supported, and the position of the first spring 4 is prevented from moving.

Referring to fig. 3, the variable damping friction section 31 includes a cylindrical first friction section 311 and second friction sections 312 symmetrically disposed at upper and lower sides of the first friction section 311, wherein a damping force between the friction plate 2 and the second friction sections 312 is greater than a damping force between the friction plate 2 and the first friction section 311. Preferably, the first friction segments 311 are arranged at the upper and lower sides of the initial position of the friction plate 2; when the washing machine is in steady operation, the friction plate 2 is in the first friction section 311 and vibrates up and down, only the third spring 6 plays a role in vibration reduction, and preferably, no damping force is generated between the friction plate 2 and the first friction section 311. When the amplitude of the washing machine is increased and the friction plate 2 vibrates up and down to reach the second friction section 312, the damping force is generated by the friction between the friction plate 2 and the second friction section 312, and the vibration amplitude is weakened. The second friction sections 312 which are symmetrically arranged up and down are arranged, so that the same damping force up and down can be provided, and the balance of the vibration reduction process is facilitated. The inner side wall below the upper supporting seat 33 in the boom cylinder 3 is a variable damping friction section 31, that is, the inner side wall between the upper supporting seat 33 and the bottom surface 32 is the variable damping friction section 31.

The variable damping friction section 31 further comprises two third friction sections 313 formed by extending along the upper end or the lower end of the second friction section 312 in the direction far away from the first friction section 311, the two third friction sections 313 are arranged in an up-down symmetrical manner, and the damping force between the friction plate plates 2 and the third friction sections 313 is greater than the damping force between the friction plate plates 2 and the second friction section 312. When the relative amplitude of the friction plate 2 is larger, the vertical vibration amplitude of the friction plate 2 reaches the third friction segment 313, and a larger damping force is provided between the friction plate 2 and the third friction segment 313.

In this embodiment, the variable damping friction section 31 provides different damping forces, and the pressure difference between the friction plate 2 and each section of the variable damping friction section 31 is realized by the different inner diameters of the variable damping friction section 31, so that the damping forces are different. Specifically, the inner diameter of the second friction section 312 is smaller than the inner diameter of the first friction section 311, and the inner diameter of the second friction section 312 is smaller than the outer diameter of the friction plate 2; the third friction segment 313 has an inner diameter smaller than that of the second friction segment 312, and the first friction segment 311 has an inner diameter larger than the outer diameter of the friction plate 2.

As shown in fig. 7 to 8, the damper of the washing machine of the present embodiment includes a damper cylinder 11 and a damper shaft 12 disposed in the damper cylinder 11, the damper shaft 12 being connected to the cabinet, and the damper cylinder being connected to the outer cylinder. The damper shaft 12 and the damper cylinder 11 are coaxial, the damper shaft 12 is linearly reciprocable in the damper cylinder 11 in the axial direction, and a certain gap is provided between the damper shaft 12 and the damper cylinder 11. A damping unit is provided between the absorber shaft 12 and the absorber tube 11. The vibration absorber can provide large resistance when the vibration amplitude is large when the washing machine runs at a low speed, the washing machine runs at a medium speed, the vibration amplitude is large when the washing machine runs at a high speed, the vibration amplitude is minimum when the washing machine runs at a low speed, the vibration absorber provides small resistance, when the washing machine vibrates very little, the resistance can hinder the washing machine to normally run, and the resistance provided by the vibration absorber can be even reduced to zero. The vibration absorber can change the provided resistance according to the vibration amplitude of the washing machine, so that the resistance is matched with the vibration, vibration is restrained, and noise is reduced.

The damping unit includes a friction plate 13 provided on the absorber shaft 12 and a damping member provided on the absorber tube 11, the damping member including a first damping member 14.

The friction plate 13 is installed on the outer wall of the shock absorber shaft 12, the friction plate 13 is in interference fit with the shock absorber shaft 12 and is in clearance fit with the shock absorber cylinder 11, and the shock absorber shaft 12 and the friction plate 13 move relatively to provide damping force. The friction plate 13 is preferably cylindrical and coaxial with the damper shaft 12.

The first damping member 14 is a member capable of generating a certain damping force, and is preferably made of a rubber material. The first damping member 14 is interference-fitted or integrally formed with the shock absorber tube 11, and is clearance-fitted to the shock absorber shaft 12. When the friction plate 13 moves to the position of the first damping member 14 along with the absorber shaft 12, the first damping member 14 contacts the friction plate 13 to generate a damping force, and when the force generated by the vibration is larger than the maximum damping force generated by the contact of the first damping member 14 with the friction plate 13, the friction plate 13 moves relative to the absorber shaft 12.

The friction plate 13 generates a damping force when contacting the first damping member 14. As shown in fig. 12, the first damping member 14 of the present embodiment includes a variable damping friction section 141 and a constant damping friction section 142. When the friction plate 13 contacts the variable damping friction section 141, the contact area between the variable damping friction section 141 and the friction plate 13 is gradually increased from the variable damping friction section 141 to the fixed damping friction section 142; when the friction plate 13 contacts the constant damping friction section 142, the contact area between the constant damping friction section 142 and the friction plate 13 is unchanged. The contact area of the constant damping friction section 142 and the friction plate 13 is larger than that of the variable damping friction section 141 and the friction plate 13.

The constant damping friction section 142 has a cylindrical shape, and the variable damping friction section 141 is a saw tooth provided on one end of the cylindrical constant damping friction section 142. The serrations are preferably triangular or trapezoidal.

In order to realize the two-way vibration damping effect, the damping member of the embodiment further comprises a second damping member 15, the structure of the second damping member 15 is the same as that of the first damping member 14, the second damping member 15 comprises a variable damping friction section and a fixed damping friction section, the variable damping friction section 141 of the first damping member is arranged opposite to the variable damping friction section of the second damping member 15, and the friction plate 13 is located between the first damping member 14 and the second damping member 15.

The damping piece can provide rigidity for the rubber material, and the variable damping friction section is zigzag, so that the damping piece can provide variable rigidity, when the extrusion displacement is small, the damping piece provides smaller rigidity, the rigidity is gradually increased along with the increase of the extrusion displacement, the provided resistance is also gradually increased, great resistance cannot be provided instantly, the resistance can be slowly increased, and sudden change vibration of the resistance from nothing to nothing can be avoided.

To further enhance the damping effect, a second friction plate 16 for contacting the damper shaft 12 is mounted on the damper cylinder 11, as shown in fig. 8. The second friction plate 16 is cylindrical and is fixedly attached to the inner wall of the damper cylinder 11. The second friction plate 16 provides a damping force upon relative movement between the damper shaft 12 and the second friction plate.

Wherein the second friction plate 16 is close to the bottom of the damper cylinder 11.

In order to further enhance the damping effect, the bottom of the damper cylinder 11 is provided with a damping spring 17 for contacting the damper shaft 12. The damping spring 17 and the spring sleeve are processed into a whole and are fastened at the bottom of the damper cylinder 11 through spring pins.

Preferably, the damper is mounted in a generally vertical or near vertical orientation, with the bottom of the damper having the damper springs 17 being the top end of the damper cylinder 11.

When the washing machine runs at a low speed in a dehydration stage, the vibration amplitude of the washing machine is large, the vibration displacement of the damper is large, as shown in fig. 11, the damper shaft contacts with the position of the damper spring, in this state, the damping force providing components comprise the damper spring providing elastic force fbarex, the friction plate 13 and the second friction plate 16 providing friction forces F2 and F1, and the resultant force of the three forces provides resistance force at the moment, wherein F = fbarex + F1+ F2.

The rotation speed of the washing machine is increased continuously, the vibration amplitude is reduced gradually, as shown in fig. 10, when the damper shaft does not contact the position of the damper spring, the friction plate 13 and the second friction plate 16 provide the friction forces F2 and F1, and the resultant force of the two forces provides the resistance force at this time, F = F1+ F2.

When the washing machine is operated at a high speed stage in a dehydrating mode, the washing machine gradually tends to a stable state, the relative displacement between the damper shaft and the damper cylinder is reduced, namely the damper shaft does not vibrate to reach the position of the second friction plate 16, as shown in fig. 9, only the friction plate 13 provides the friction force F2 as a damping force, and F = F2 is resistance force.

If the vibration amplitude of the washing machine is small, the vibration is between the two damping members, the friction plate is not in contact with the damping members, the friction plate moves along with the vibration absorber shaft, and the resistance is F =0 at the moment, as shown in FIG. 8.

Rotational speed	Low speed	Medium speed	Gao Su	Gao Su
					Amplitude of vibration	Large vibration amplitude	The vibration amplitude is larger	Small vibration amplitude	Very small amplitude of vibration
Resistance provided	F bullet + F1+ F2, large	F1+ F2, larger	F2, small	0

From the above table, the damper of the embodiment provides a large resistance when the low-speed vibration is large, the damper operates at a medium speed, the damper provides a large resistance when the vibration amplitude is large, the vibration amplitude is minimum when the washing machine operates at a high speed, the damper provides a small resistance, when the washing machine vibrates very little, the resistance hinders the normal operation of the washing machine, and the resistance provided by the damper is 0. The structure of the vibration damper of the embodiment can change the provided resistance according to the vibration amplitude of the washing machine, thereby inhibiting vibration and reducing noise.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. A drum washing machine is provided with a box body and an outer drum arranged in the box body, and is characterized in that the outer drum is hung in the box body through a vibration reduction hanging rod, and the vibration reduction hanging rod is hung on a side panel of the box body, close to a rear panel; a vibration absorber is arranged between the outer cylinder and the box body, and the vibration absorbers are positioned on two sides of the outer cylinder and are arranged in a staggered manner; the vibration reduction suspender comprises a rod piece, a friction sheet plate fixed at the lower part of the rod piece and a suspender cylinder sleeved outside the rod piece and the friction sheet plate, wherein the inner side of the suspender cylinder is provided with a variable damping friction section matched with the periphery of the friction sheet plate; the upper part and the lower part of the friction sheet plate are provided with damping springs; the damping spring comprises a first spring arranged at the upper end of the friction plate and extending upwards and a second spring arranged at the lower end of the friction plate and extending downwards; the upper end of the first spring is in a free state, and the lower end of the second spring is in a free state; the variable damping friction section comprises a cylindrical first friction section and second friction sections which are symmetrically arranged at the upper side and the lower side of the first friction section, and the damping force between the friction plate and the second friction sections is greater than the damping force between the friction plate and the first friction sections; the inner diameter of the second friction section is smaller than that of the first friction section, and the inner diameter of the second friction section is smaller than the outer diameter of the friction sheet plate.

2. A drum washing machine according to claim 1, characterized in that the upper end of the inner side of the hanging rod cylinder is provided with an upper supporting seat, and the friction plate and the damping spring vibrate between the upper supporting seat and the bottom surface of the hanging rod cylinder.

3. A drum washing machine according to claim 1, characterized in that a plurality of first springs are symmetrically or axially uniformly arranged on the upper end of the friction plate.

4. A drum washing machine according to claim 1, characterized in that the first spring and the second spring are coaxially arranged in pairs up and down, and the first spring and the second spring which are coaxially arranged have the same stiffness.

5. A drum washing machine according to claim 2, characterized in that the damping spring comprises a third spring disposed between the upper supporting seat and the friction plate and sleeved on the rod, and the upper end of the third spring is disposed on the upper supporting seat and the lower end is disposed on the friction plate.

6. A drum washing machine according to claim 1, characterized in that the variable damping friction section further comprises two third friction sections formed by extending along the tail end of the second friction section in a direction away from the first friction section, the two third friction sections are arranged symmetrically up and down, and the damping force between the friction plate and the third friction sections is greater than the damping force between the friction plate and the second friction sections.

7. A drum washing machine according to claim 1, characterized in that the vibration absorber comprises a vibration absorber cylinder and a vibration absorber shaft arranged in the vibration absorber cylinder, a friction plate is arranged on the vibration absorber shaft, a damping member is arranged on the vibration absorber cylinder, the friction plate generates damping force when contacting with the damping member, and the damping member comprises a variable damping friction section and a constant damping friction section; when the friction plate is contacted with the variable damping friction section, the contact area of the variable damping friction section and the friction plate is gradually increased from the variable damping friction section to the fixed damping friction section; when the friction plate is contacted with the fixed damping friction section, the contact area between the fixed damping friction section and the friction plate is unchanged.

8. A drum washing machine according to claim 7, characterized in that the constant damping friction section is cylindrical and the variable damping friction section is saw teeth provided on one end of the cylindrical constant damping friction section.

9. A drum washing machine according to claim 8, characterized in that the saw-teeth are triangular or trapezoidal.

10. A drum washing machine according to any one of claims 7-9 characterized in that the damping member comprises a first damping member and a second damping member, the first and second damping members each comprising a variable damping friction section and a fixed damping friction section, the variable damping friction section of the first damping member being disposed opposite to the variable damping friction section of the second damping member, the friction plate being located between the first and second damping members.

11. A drum washing machine according to any one of claims 7-9, characterized in that a second friction plate is mounted on the damper cylinder for contact with the damper shaft.

12. A drum washing machine according to claim 10, characterized in that the damper cylinder is mounted with a second friction plate for contact with the damper shaft.

13. A drum washing machine according to any one of claims 7-9, characterized in that the bottom of the damper cylinder is provided with a damper spring for contacting the damper shaft.

14. A drum washing machine according to claim 10, characterized in that the bottom of the damper cylinder is provided with a damper spring for contacting the damper shaft.

15. A drum washing machine according to claim 1, characterized in that the damping hanger bar is provided with a damping pad at the junction with the cabinet.