CN111197239B - Drum washing machine - Google Patents

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

A drum washing machine

technical field

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

Background technique

An inner cylinder and an outer cylinder are arranged in the box of the drum washing machine, and the outer cylinder is assembled with the box through a shock absorber and a spring. In order to achieve a better vibration reduction effect, the washing machine needs to be equipped with a heavy weight, which accounts for more than 40% of the suspension system. Therefore, the entire suspension system is very heavy, resulting in a particularly heavy weight of the washing machine. The vibration damping system with spring and shock absorber is not good for the resonance and steady vibration of the shock absorber.

How to provide a drum washing machine that can not only reduce the counterweight, but also ensure the vibration reduction effect is a technical problem to be solved urgently by those skilled in the art.

At present, the hanger device of the washing machine includes a rod, a hanger seat, a ball seat, a spring and a spring seat. The hanger seat is arranged at the top of the rod, and the spring seat, the spring and the ball seat run through the rod in sequence from the bottom end of the rod. There is a friction plate inside the ball seat; a hinge plate is set on the box corner of the washing machine, and the convex spherical surface of the boom seat is matched with the spherical surface groove of the hinge plate on the box corner; the bottom end of the outer cylinder also has a spherical surface groove, the ball The convex spherical surface of the seat is matched with the spherical groove at the bottom end of the outer cylinder, so that the dehydration inner cylinder and the outer cylinder are suspended on the four box corners on the upper part of the outer box body.

When the washing machine is working, the vibration generated by the outer cylinder will cause the ball seat to move up and down, and the ball seat will generate damping force through the reciprocating friction between the friction plate and the rod, thereby suppressing the vibration and improving the vibration and noise level of the whole machine.

However, in the transient stage of dehydration, the internal system of the washing machine vibrates greatly, and the boom device needs to provide a relatively large damping force to suppress the vibration of the internal system; in the steady state stage of dehydration, the vibration of the internal system is small, and the boom device needs to provide a relatively large damping force. Relatively small damping force to isolate vibration; while the above-mentioned hanger device can only provide a single damping force through the friction between the friction plate and the rod, and the frictional contact area is small; and when the hanger device is assembled, the ball seat surface will Apply grease to improve lubrication conditions; therefore, in the transient stage of dehydration with large internal system vibration, the damping force of the boom device is often difficult to suppress the vibration of the system during operation; in the steady state stage of dehydration with small internal system vibration, the grease Under the action of the viscous effect and the damping force of the boom, the boom device will move up and down, causing abnormal vibration and noise. In addition, the vibration reduction boom of the washing machine generally achieves the effect of vibration reduction by installing a spring on the rod, which causes the washing machine to vibrate greatly during the operation process, which is easy to consume the service life of the washing machine.

How to provide a hanger device of a washing machine to realize the dual functions of suppressing vibration in transient dehydration and isolating vibration in steady state dehydration, thereby improving the level of vibration and noise in the dehydration stage, while avoiding the up and down movement of the hanger device, is the current state of the art. Technical problems that people need to solve urgently.

For the shock absorber of the washing machine, because the washing machine vibrates greatly at low speed and has resonance points, it runs stably at high speed, so the vibration reduction requirements of the washing machine at low speed and high speed are different, and the shock absorber needs to be able to vibrate at low speed. When it is large, it provides a large damping force, and when the high-speed vibration is small, it provides a small damping force.

Existing shock absorbers generally include friction shock absorbers and free travel shock absorbers, which have the following disadvantages:

1. In the existing friction shock absorber, a friction plate is arranged between the shock absorber shaft and the shock absorber cylinder. When the washing machine is dewatering at low speed or high speed, the damping force provided by the shock absorber is unchanged, and the damping force of the shock absorber remains unchanged. The damping force provided by the vibrator under high-speed friction for a long time may be slightly weakened. Such a shock absorber cannot change the magnitude of the damping force, and cannot meet the damping force requirements of the washing machine at low speed and high speed.

2. Free-stroke shock absorber, according to the relative vibration displacement between the shock absorber shaft and the shock absorber cylinder, the presence or absence of the damping force is changed. When it is increased to a state with damping force, the impact force is large, and the washing machine will have sudden vibration and noise. Although this type of shock absorber can change the size of the damping force, it will generate a large instantaneous vibration and cause a large noise at the moment when the damping force goes from nothing to nothing and when it goes from there to nothing.

Therefore, the existing shock absorber has the problem that the washing machine cannot provide a damping force adapted to the rotation speed when the washing machine is at different rotation speeds.

SUMMARY OF THE INVENTION

Aiming at the above problems in the prior art, the present invention provides a drum washing machine to solve the technical problems of heavy drum washing machine and poor vibration damping effect.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical solutions to realize:

A drum washing machine has a box body and an outer cylinder arranged in the box body, the outer cylinder is hoisted in the box body by a vibration-damping boom, and the vibration-damping boom is hoisted on a side panel of the box body close to the The position of the rear panel; shock absorbers are arranged between the outer cylinder and the box body, and the shock absorbers are located on both sides of the outer cylinder and are arranged in dislocation.

In the drum washing machine as described above, the vibration damping boom includes a rod, a friction plate fixed at the lower part of the rod, and a boom tube sleeved on the outside of the rod and the friction plate, and the boom cylinder has a The inner side is provided with a variable damping friction section matched with the outer periphery of the friction plate; the upper and lower parts of the friction plate are provided with vibration damping springs.

In the above-mentioned drum washing machine, an upper support seat is provided at the inner upper end of the boom barrel, and the friction plate and the damping spring vibrate between the upper support seat and the bottom surface of the boom barrel.

In the drum washing machine as described above, the damping spring includes a first spring arranged on the upper end of the friction lining plate and extending upward and a second spring arranged on the lower end of the friction lining plate and extending downward; The upper end is in a free state, and the lower end of the second spring is in a free state.

In the above-mentioned drum washing machine, a plurality of first springs symmetrically arranged or evenly distributed in the axial direction are arranged on the upper end of the friction plate.

In the above-mentioned front-loading washing machine, the first spring and the second spring are arranged in pairs coaxially up and down, and the first spring and the second spring arranged coaxially have the same stiffness.

In the above-mentioned drum washing machine, the damping spring includes a third spring arranged between the upper support seat and the friction plate and sleeved on the rod, and the upper end of the third spring is arranged on the The upper support seat and the lower end are arranged on the friction plate.

In the above-mentioned drum washing machine, the variable damping friction section includes a cylindrical first friction section and a second friction section symmetrically arranged on the upper and lower sides of the first friction section, and the friction plate and the second friction section are The damping force between the friction plates is greater than the damping force between the friction plate and the first friction segment.

In the above drum washing machine, 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 plate.

In the drum washing machine as described above, the variable damping friction segment further comprises two third friction segments formed along the end of the second friction segment and extending away from the first friction segment, and the two third friction segments are arranged symmetrically up and down , the damping force between the friction plate and the third friction segment is greater than the damping force between the friction plate and the second friction segment.

In the drum washing machine as described above, the shock absorber includes a shock absorber cylinder and a shock absorber shaft arranged in the shock absorber cylinder, a friction plate is installed on the shock absorber shaft, and the shock absorber A damping member is installed on the cylinder, and a damping force is generated when the friction sheet is in contact with the damping member, and the damping member includes a variable damping friction section and a constant damping friction section; when the friction sheet is in contact with the variable damping friction section , the contact area between the variable damping friction segment and the friction plate gradually increases from the variable damping friction segment to the constant damping friction segment; when the friction plate is in contact with the constant damping friction segment, the constant damping friction The contact area of the segment with the friction plate remains unchanged.

In the drum washing machine as described above, the constant damping friction segment is cylindrical, and the variable damping friction segment is a saw tooth disposed on one end of the cylindrical constant damping friction segment.

In the front-loading washing machine as described above, the saw teeth are triangular or trapezoidal.

In 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 both include a variable damping friction section and a constant damping friction section, the first damping member The variable damping friction section of the second damping member is arranged opposite to the variable damping friction section of the second damping member, and the friction plate is located between the first damping member and the second damping member.

In the above-mentioned front-loading washing machine, the damper drum is provided with a second friction plate for contacting with the damper shaft.

In the above-mentioned front-loading washing machine, the bottom of the damper drum is provided with a damping spring for contacting with the damper shaft.

In the above-mentioned front-loading washing machine, a vibration-damping pad is provided at the connection between the vibration-damping boom and the box.

Compared with the prior art, the advantages and positive effects of the present invention are: the vibration damping system of the drum washing machine of the present invention is composed of four suspension rods and two vibration dampers, and the outer cylinder is hoisted in the box through the four vibration damping suspension rods. , the boom is hoisted on the side panel of the box near the rear panel; two shock absorbers are arranged between the outer tube and the box, and the shock absorbers are located on both sides of the outer tube and are arranged in dislocation. In the present invention, by adjusting the hanging position of the boom, a stable state of static balance can be achieved when all the counterweights are removed from the drum washing machine, and due to the existence of the boom, the vibration damping system can provide greater rigidity; and the shock absorber The setting not only provides certain damping for the front-loading washing machine, but also can well match the balance of the four boom position system. The drum washing machine of the present invention reduces all the counterweights, and ensures the vibration reduction effect of the system by optimizing the vibration reduction system. The drum washing machine of the invention has the advantages of light weight, reduced cost and good vibration damping effect.

The damping boom provided by the present invention provides damping by arranging the friction plate and the variable damping friction section inside the boom barrel. On the one hand, the contact area between the friction plate and the boom barrel is large, which is beneficial to provide a larger damping force. On the other hand, the damping force is generated on the inner circumference of the boom cylinder, which is beneficial to the balance of the force and avoids jitter; on the other hand, the variable damping friction section on the inner side of the boom cylinder can be set when the vibration amplitude is small, Provide less damping or no damping force; when the vibration amplitude is large, provide a large damping force; the greater the vibration amplitude, provide a greater damping force, which can quickly suppress the vibration and ensure stable dehydration. Smooth operation; the vibration damping springs arranged on the upper and lower sides of the friction plate avoid the collision between the friction plate and the boom cylinder, and ensure the vibration reduction effect.

The shock absorber provided by the invention can provide a large resistance when the washing machine runs at a low speed and the vibration amplitude is large, the washing machine runs at a medium speed and provides a large resistance when the vibration amplitude is large, and the washing machine runs at a high speed and provides a minimum vibration amplitude. A small resistance, when the washing machine vibrates very little, the resistance will hinder its normal operation, and the resistance provided by the shock absorber can even be reduced to zero. The shock absorber of the invention can change the resistance provided according to the vibration amplitude of the washing machine, so that the resistance can be matched with the vibration, thereby suppressing the vibration and reducing the noise.

Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

1 is a schematic structural diagram of an embodiment of a washing machine vibration damping boom proposed by the present invention;

Fig. 2 is the cross-sectional enlarged structural schematic diagram of the boom barrel in Fig. 1;

Fig. 3 is the structural representation of the boom barrel in Fig. 2;

Fig. 4 is the enlarged structural schematic diagram after removing the boom cylinder in Fig. 2;

Fig. 5 is the structural schematic diagram after removing the boom cylinder shell in Fig. 1;

FIG. 6 is an enlarged schematic view of the lower part of FIG. 5 .

FIG. 7 is a schematic view of the appearance structure of a shock absorber according to a specific embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along the line B-B of FIG. 7 .

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

FIG. 10 is a cross-sectional view of a shock absorber in a second state according to an embodiment of the present invention.

FIG. 11 is a cross-sectional view of a shock absorber in a third state according to an embodiment of the present invention.

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

13 is a schematic diagram of a washing machine according to a specific embodiment of the present invention.

Fig. 14 is a schematic view of the assembly of the outer cylinder, the boom and the shock absorber according to the specific embodiment of the present invention.

FIG. 15 is a side view of FIG. 14 .

Detailed ways

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

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "upper", "lower", "left", "right", etc. is based on the positional relationship shown in the accompanying drawings, with When the product is in normal use, the side close to the user is "front", and the side away from the user is "rear". The terms are only used to facilitate the description of the present invention and to simplify the description, rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance; features defined with "first" and "second" may expressly or One or more of these features are implicitly included. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

As shown in FIGS. 13-15 , an embodiment of the drum washing machine proposed by the present invention, a drum washing machine, has a box body 18 and an outer cylinder 19 arranged in the box body 18 , and the outer cylinder 19 passes through the vibration-damping boom 111 . It is hoisted in the box body 18 , and the vibration damping boom 111 is hoisted on the side panel of the box body 18 near the rear panel. A shock absorber 110 is disposed between the outer cylinder 19 and the box body 18 , and the shock absorbers 110 are located on both sides of the outer cylinder 19 and are dislocated. The outer cylinder 19 is hoisted in the box body 18 through 2, 4 and 6 vibration-damping hangers 111 , and the vibration-damping hangers 111 are distributed on both sides of the outer cylinder 19 . In this embodiment, it is preferred that the outer cylinder 19 pass through four vibration-damping hangers 111 . It is hoisted in the box body 18 , and the four shock-absorbing suspension rods 111 are symmetrically distributed on both sides of the outer tub 19 . In this embodiment, preferably, two shock absorbers 110 are arranged between the outer cylinder 19 and the box body 18 , and the shock absorbers 110 are located on both sides of the outer cylinder 19 and are arranged in a staggered position. Preferably, the positions of the two shock absorbers 110 are the outer cylinder 19 diagonal position.

Since all the counterweights are removed from the washing machine, the center of gravity will be shifted to the rear side. Adjust the suspension position of the damping boom 111. The suspension position of the damping boom 111 is the middle rear position of the side panel, so that it can achieve static balance. stable state. The spring in the damping boom is a compression spring, thus, the damping boom 111 can provide greater stiffness.

A vibration-damping pad is provided at the connection between the vibration-damping suspension rod 111 and the box body 18 , which can play a role of vibration buffering.

The shock absorbers 110 are reduced from the original four to two, and the two shock absorbers 110 are staggered. It also works well with the four shock-absorbing booms to maintain the balance of the system.

By using the structure and position matching of the shock-absorbing boom, the shock-absorbing pad and the shock absorber, the entire washing machine can still have a better shock-absorbing effect without counterweight.

Referring to FIGS. 1 to 6 , it is an embodiment of a washing machine vibration damping hanger proposed by the present invention. A washing machine vibration damping hanger includes a rod member 1 , a friction plate 2 fixed at the lower part of the rod member 1 , and a set On the hanger cylinder 3 outside the rod member 1 and the friction plate 2, the outer cylinder of the washing machine is hung on the hanger cylinder 3, and the upper end of the rod member 1 is hung on the corner plate of the box; the inner side of the hanger cylinder 3 is provided with The variable damping friction section 31 matched with the outer circumference of the friction lining plate 2; the upper and lower parts of the friction lining plate 2 are provided with vibration damping springs. During the operation of the washing machine, the vibration of the outer cylinder drives the boom cylinder 3 to vibrate on the rod member 1, so that the friction plate 2 moves up and down relative to the boom cylinder 3; The damping friction section provides damping force. On the one hand, the contact area between the friction plate 2 and the boom cylinder 3 is large, which is beneficial to provide a larger damping force; It is beneficial to the balance of the force and avoid jitter; on the other hand, the variable damping friction section on the inner side of the boom barrel 3 can be set to provide small damping or no damping force when the vibration amplitude is small; when the vibration amplitude is large When the vibration amplitude is larger, a larger damping force is provided; the larger the vibration amplitude is, the larger the damping force is, which can quickly suppress the vibration and ensure the smooth operation during steady-state dehydration; The collision between the friction plate 2 and the boom cylinder 3 is avoided, and the vibration reduction effect is ensured.

In this embodiment, an upper support seat 33 is provided on the inner upper end of the boom barrel 3 , and an insertion hole 331 for the rod 1 to be inserted into is formed on the upper support seat 33 . 331 is a vertical stop plane 332, the friction plate 2 and the damping spring vibrate between the upper support seat 33 and the bottom surface 32 of the boom barrel 3, specifically between the lower end surface and the bottom surface 32 of the upper support seat 33. By setting the upper support base 33 and setting the lower end surface of the upper support base 33 as a stop plane 332 perpendicular to the extending hole 331 , the lower end surface of the upper support base 33 can be in contact with the damping spring to provide a damping function.

Referring to FIG. 2 , the damping spring includes a first spring 4 arranged on the upper end of the friction plate 2 and extending upward and a second spring 5 arranged at the lower end of the friction plate 2 and extending downward; the upper end of the first spring 4 is in a free state , the lower end of the second spring 5 is in a free state. That is, the lower end of the first spring 4 and the friction plate 2 are fixedly arranged, and the upper end of the second spring 5 is fixedly arranged between the friction plate 2; large, the upper end of the first spring 4 is in contact with the upper support seat 33, and the first spring 4 is pressed between the friction plate 2 and the upper support seat 33; then the first spring 4 releases its elastic force, so that the friction plate 2 The lower end of the second spring 5 is in contact with the bottom surface 32 of the boom cylinder 3, and the second spring 5 is pressed between the friction plate 2 and the bottom surface 32 of the boom cylinder 3; When the friction plate 2 moves up and down relative to the boom cylinder 3, the friction plate 2 contacts with the variable damping friction section, so that the amplitude is reduced. When the washing machine is running in a steady state, the amplitude is reduced, the relative movement of the friction plate 2 in the boom cylinder 3 is small, and the upward displacement of the friction plate 2 relative to the boom cylinder 3 is small. When the upper end of the spring 4 is not in contact with the upper support seat 33, the friction plate 2 begins to move downward relative to the hanger cylinder 3, that is, the first spring 4 is not compressed and is in a free state at this time; It needs to be set in the non-working state of the washing machine, and the distance between the upper end of the first spring 4 and the upper support seat 33 is greater than the amplitude in the steady state of the washing machine, that is, smaller than the friction plate 2 from the initial state to the opposite to the hanger cylinder 3. The distance to move up. Similarly, when the washing machine is running in a steady state, the second spring 5 is also in a free state and is not in contact with the bottom surface 32 of the boom barrel 3 . By arranging the first spring 4 and the second spring 5, when the friction plate 2 vibrates up and down relative to the boom cylinder 3, the collision between the friction plate 2 and the boom cylinder 3 can be avoided, and the vibration can be slowed down.

The damping spring also includes a third spring 6 arranged between the upper support seat 33 and the friction plate 2, the third spring 6 is sleeved on the rod 1, and the upper end of the third spring 6 is fixedly arranged on the upper support seat 33 and the lower end. It is fixedly arranged on the friction plate 2 . The third spring 6 gives the friction plate 2 a force relative to the boom cylinder 3 to move towards the initial position. When the friction plate 2 is in the initial state, the third spring 6 is in an unstressed state; when the friction plate 2 is relative to the boom cylinder 3 When moving upward, the third spring 6 is compressed, providing elastic force so that the wiper plate 2 has a downward tendency to move; when the friction plate 2 moves downward relative to the boom cylinder 3, the third spring 6 is stretched, providing The pulling force causes the wiper plate 2 to have a tendency to move upwards.

When the washing machine starts dehydration, the vibration amplitude is generally large. At this time, the first spring 4, the second spring 5, and the third spring 6 all play a role in damping vibration. At this time, the stiffness of the damping spring is the first spring 4, the second spring The superposition of the stiffness of the spring 5 and the third spring 6; when the washing machine is running 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. The stiffness of the vibrating spring is the stiffness of the third spring 6 . Therefore, when the vibration amplitude of the washing machine is large, the stiffness of the vibration damping spring is large; it can withstand a large vibration impact, and has a better vibration damping effect in the case of a large vibration amplitude. When the vibration amplitude of the washing machine is small, the stiffness of the vibration damping spring is small, which can provide a soft vibration damping effect and avoid vibration.

In order that the first spring 4 can give the friction plate 2 a balanced force, a plurality of first springs 4 symmetrically arranged or evenly distributed in the axial direction are arranged on the upper end of the friction plate 2 to avoid the force of the friction plate 2 on the plane. tilt. The friction plate 2 vibrates so that the upper and lower amplitudes are the same, so it is preferable to set the friction plate 2 to receive the same elastic force of the damping spring in the up and down direction. The rigidity of the first spring 4 and the second spring 5 are the same. After the boom 1 is installed, it has a tendency to incline upwards and outwards. The compression amount of the first spring 4 on the outside is slightly smaller, and the setting rigidity is slightly larger. Multiple first springs 4 can be installed to increase the rigidity in the direction close to the box body, so that the entire reduction The vibrating boom is in a stable state. In this embodiment, two left and right first springs 4 are provided, two second springs 5 and one third spring 6 are arranged coaxially up and down, and a total of six springs are provided.

Referring to FIG. 6, for the stability and firmness of the first spring 4 after installation, a first spring seat 7 is provided at the lower end of the first spring 4, and the first spring seat 7 is fixed on the upper end surface of the friction plate 2, The lower end of the first spring 4 is fixed on the first spring seat 7 . A second spring seat 9 is provided on the upper end of the second spring 5 , the second spring seat 9 is fixed on the friction plate 2 , and the upper end of the second spring 5 is fixed on the second spring seat 9 . A spring column 8 is arranged inside the first spring 4 , the spring column 8 is fixed at the center of the first spring seat 7 , the spring column 8 protrudes from the second spring seat 9 and extends upward, and the spring column 8 protrudes from the second spring seat 9 The height is half of the height of the second spring 5; and the lower end of the spring column 8 is fixed on the second spring seat 9 through the friction plate 2. By arranging the spring column 8, the fixing of the first spring seat 7 and the second spring seat 9 is facilitated; and the coaxiality of the first spring seat and the second spring seat 9 is facilitated, that is, the first spring 4 and the second spring seat 9 are facilitated. The coaxial arrangement of the spring 5 ; and the arrangement of the spring column 8 are also beneficial to form a support for the first spring 4 and avoid the movement of the position of the first spring 4 .

Referring to FIG. 3 , the variable damping friction segment 31 includes a cylindrical first friction segment 311 and a second friction segment 312 symmetrically arranged on the upper and lower sides of the first friction segment 311 , wherein the friction plate 2 and the second friction segment 312 The damping force between the segments 312 is greater than the damping force between the friction plate 2 and the first friction segment 311 . Preferably, the first friction section 311 is arranged on the upper and lower sides of the initial position of the friction plate 2; when the washing machine is in steady state operation, the friction plate 2 vibrates up and down in the first friction section 311, and only the third spring 6 For the vibration damping effect, it is preferable to set that no damping force is generated between the friction plate 2 and the first friction segment 311 at this time. When the amplitude of the washing machine increases, the friction plate 2 vibrates up and down to reach the second friction section 312, the friction between the friction plate 2 and the second friction section 312 generates a damping force, reducing the vibration amplitude. By arranging the second friction sections 312 symmetrically arranged up and down, it is beneficial to provide the same damping force up and down, which is beneficial to the balance of the vibration reduction process. The inner wall below the upper support seat 33 in the boom barrel 3 is the variable damping friction section 31 , that is, the inner wall between the upper support seat 33 and the bottom surface 32 is the variable damping friction section 31 .

The variable damping friction segment 31 also includes two third friction segments 313 extending along the upper or lower end of the second friction segment 312 in a direction away from the first friction segment 311. The two third friction segments 313 are arranged symmetrically up and down, and the friction plates The damping force between the friction plate 2 and the third friction segment 313 is greater than the damping force between the friction plate 2 and the second friction segment 312 . When the relative amplitude of the friction plate 2 is larger, the up and down vibration amplitude of the friction plate 2 reaches the third friction segment 313 , and a greater 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 inner diameter of the variable damping friction section 31 is different, so that the pressure between the friction plate 2 and each section of the variable damping friction section 31 is different, so the damping force is different. realized. Specifically, the inner diameter of the second friction segment 312 is smaller than the inner diameter of the first friction segment 311 , the inner diameter of the second friction segment 312 is smaller than the outer diameter of the friction plate 2 ; the inner diameter of the third friction segment 313 is smaller than the inner diameter of the second friction segment 312 , the inner diameter of the first friction segment 311 is larger than the outer diameter of the friction plate 2 .

As shown in Figures 7-8, the shock absorber of the washing machine in this embodiment includes a shock absorber drum 11 and a shock absorber shaft 12 arranged in the shock absorber drum 11. The shock absorber shaft 12 is connected to the box body, and the shock absorber The barrel is connected to the outer barrel. The shock absorber shaft 12 and the shock absorber barrel 11 are coaxial, the shock absorber shaft 12 can linearly reciprocate in the shock absorber barrel 11 along the axis direction, and there is a certain distance between the shock absorber shaft 12 and the shock absorber barrel 11 . gap. A damping unit is provided between the damper shaft 12 and the damper barrel 11 . The shock absorber can provide a large resistance when the washing machine runs at low speed and the vibration amplitude is large, the washing machine runs at a medium speed and provides a large resistance when the vibration amplitude is large, and the washing machine runs at a high speed and provides a small vibration amplitude when the vibration amplitude is the smallest. Resistance, when the washing machine vibrates very little, the resistance will hinder its normal operation, and the resistance provided by the shock absorber can even be reduced to zero. The shock absorber in this embodiment can change the resistance provided according to the vibration amplitude of the washing machine, so that the resistance is matched with the vibration, thereby suppressing vibration and reducing noise.

The damping unit includes a friction plate 13 disposed on the shock absorber shaft 12 and a damping member disposed on the shock absorber barrel 11 , and the damping member includes 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 has an interference fit with the shock absorber shaft 12 and a clearance fit with the shock absorber cylinder 11. After the relative movement between the shock absorber shaft 12 and the friction plate 13 Provides damping force. The friction plate 13 is preferably cylindrical and coaxial with the damper shaft 12 .

The first damping member 14 is a component capable of generating a certain damping force, preferably a rubber material. The first damping member 14 is in an interference fit or integral process with the shock absorber cylinder 11 , and is in clearance fit with the shock absorber shaft 12 . When the friction plate 13 moves together with the shock absorber shaft 12 to the position of the first damping member 14, the first damping member 14 contacts the friction plate 13 to generate a damping force. When the force generated by the vibration is greater than the first damping member 14 and the friction plate The friction plate 13 moves relative to the shock absorber shaft 12 only when the maximum damping force generated by the contact 13 is reached.

A damping force is generated when the friction plate 13 is in contact with the first damping member 14 . As shown in FIG. 12 , the first damping member 14 in this embodiment includes a variable damping friction segment 141 and a constant damping friction segment 142 . When the friction plate 13 is in contact with the variable damping friction segment 141, the contact area between the variable damping friction segment 141 and the friction plate 13 gradually increases from the variable damping friction segment 141 to the constant damping friction segment 142; the friction plate 13 and the constant damping friction segment When 142 is in contact, the contact area between the constant damping friction segment 142 and the friction plate 13 remains unchanged. The contact area between the constant damping friction segment 142 and the friction plate 13 is greater than the contact area between the variable damping friction segment 141 and the friction plate 13 .

The constant damping friction segment 142 is cylindrical, and the variable damping friction segment 141 is a sawtooth disposed on one end of the cylindrical constant damping friction segment 142 . The serrations are preferably triangular or trapezoidal.

In order to achieve the two-way vibration damping effect, the damping member in this embodiment further includes 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 includes a variable damping friction section and a fixed damping section. The variable damping friction segment 141 of the first damping member is disposed opposite to the variable damping friction segment 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 member is a rubber material, which can provide a rigidity. Since the variable damping friction segment is zigzag, the damping member can provide a variable stiffness. When the extrusion displacement is small, the damping member provides a small stiffness. As the displacement increases, the stiffness gradually increases, and the resistance provided also increases gradually. It will not provide a large resistance instantaneously, and the resistance will gradually increase, and there will be no sudden vibration of resistance from scratch.

In order to further improve the damping effect, as shown in FIG. 8 , a second friction plate 16 for contacting the damper shaft 12 is mounted on the damper cylinder 11 . The second friction plate 16 is cylindrical, and is fixedly mounted on the inner wall of the shock absorber cylinder 11 . The damping force is provided after the relative movement between the second friction plate 16 and the shock absorber shaft 12 .

Wherein, the second friction plate 16 is close to the bottom of the shock absorber cylinder 11 .

In order to further improve 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 one piece, and are fastened to the bottom of the damper cylinder 11 by means of spring nails.

Preferably, the shock absorber is generally installed in a vertical direction or close to the vertical direction, and the bottom of the shock absorber with the shock absorbing spring 17 is the top end of the shock absorber barrel 11 .

When the washing machine is in the dehydration stage and running at low speed, the vibration amplitude of the washing machine is large, and the vibration displacement of the shock absorber is large. As shown in Figure 11, the shock absorber shaft will contact the position of the vibration damping spring. The components of the damping force include a damping spring to provide elastic force F, the friction plate 13 and the second friction plate 16 to provide friction forces F2 and F1, and the resultant force of the three forces provides the resistance at this time, F=F bomb + F1 + F2.

The rotation speed of the washing machine continues to increase, and the vibration amplitude gradually decreases. As shown in Figure 10, when the shock absorber shaft does not contact the position of the shock absorber spring, the components that provide damping force at this time include the friction plate 13 and the second friction plate 16. Provide friction forces F2 and F1, and the resultant force of the two forces provides the resistance at this time, F= F1+ F2.

When the washing machine dehydrates to a high speed stage, the washing machine gradually tends to a stable state, and the relative displacement between the shock absorber shaft and the shock absorber cylinder decreases, that is, when the shock absorber shaft does not vibrate to the position of the second friction plate 16 , as shown in Figure 9, at this time, only the friction plate 13 provides the friction force F2, and the resistance at this time, F= F2.

If the vibration amplitude of the washing machine is small and the vibration is between the two damping parts, the friction plate does not contact the damping part, and the friction plate moves together with the shock absorber shaft, as shown in Figure 8, the resistance at this time, F= 0.

Rotating speed low speed medium speed high speed high speed Vibration amplitude Large vibration amplitude The vibration amplitude is large Small vibration amplitude The vibration amplitude is small resistance provided F bomb + F1 + F2, large F1+ F2, larger F2, small 0

As can be seen from the above table, the shock absorber of this embodiment can provide greater resistance when the vibration is large at low speed. When the vibration amplitude is the smallest, the shock absorber provides a small resistance. When the washing machine vibrates very little, the resistance will hinder its normal operation, and the shock absorber provides 0 resistance. The structure of the shock absorber in this embodiment can change the resistance provided according to the magnitude of the vibration amplitude of the washing machine, thereby suppressing the vibration and reducing the noise.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications to equivalent changes. Example. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still belong to the protection scope of the technical solutions of the present invention.

Claims (15)

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.

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