CN102212952B - A kind of damping device of roller washing machine - Google Patents

Abstract

The invention discloses a shock absorbing device for a drum washing machine, which relates to the field of washing machines, and comprises a housing, an outer cylinder, a tension spring connected above the outer cylinder, a damping support rod installed under the outer cylinder, and an open end and a bottom end of the outer cylinder respectively. It has a front counterweight and a rear counterweight, and is characterized in that two compression springs are installed under the outer cylinder, and the two compression springs are respectively installed on both sides of the axis of the bottom of the outer cylinder. In this scheme, compression springs are installed on both sides of the bottom axis of the outer cylinder to share the weight of the outer cylinder and the weight of the counterweight, which can reduce the gravity on the damping support rod and extension spring, reduce the required strength of the extension spring and damping support rod, and extend the damping The service life of the support rod and the tension spring is improved, and the vibration and noise of the entire drum washing machine are controlled within a certain range, so as to achieve the purpose of reducing vibration and eliminating noise.

Description

Shock absorbing device for drum washing machine

technical field

The invention relates to the field of washing machines, in particular to a shock-absorbing device for reducing the load of a tension spring and reducing the noise of a drum washing machine by supporting an outer cylinder with a compression spring.

Background technique

In the field of washing machines, the working method of the drum washing machine is different from that of the pulsator washing machine. The inner cylinder of the pulsator washing machine rotates left and right around the vertical axis to wash clothes, while the inner cylinder of the drum washing machine rotates left and right around the horizontal axis. Clothes and different rotation directions make the installation methods and shock absorption methods of the two outer cylinders also different. In terms of shock absorption, the outer cylinder of the drum washing machine is mostly hung in the air and placed in the box. The adopted scheme is: use two to four tension springs to hang the outer cylinder in the middle of the box. When the inner cylinder rotates to drive the outer cylinder to shake, The extension spring will reduce the shaking range of the outer cylinder and reduce the noise. In some drum washing machines, in order to reduce the gravity of the tension spring and enhance the shock absorption effect, a corresponding number of damping support rods are arranged under the outer cylinder. The damping support rods not only share part of the gravity, but also shake to a certain extent with the outer cylinder. , Greatly offset and reduce the vibration amplitude and voice of the outer tube. However, in the above-mentioned shock absorption method, since the tension spring and the damping support rod are continuously stressed, and the magnitude of the gravity changes from time to time with the amount of clothes and different washing procedures, the amplitude of the shaking of the outer cylinder is also different each time. Working in this state will lead to a certain degree of deformation of the tension spring and the damping support rod, which reduces the service life and affects the shock absorption effect of the washing machine. In addition, the extension spring and the damping support rod are point-connected to the outer cylinder. The shock absorption principle is to expand and contract the movement stroke of the outer cylinder with the change of the centrifugal force of the outer cylinder. When the centrifugal force of the outer cylinder is greater than the limit of the extension spring or the damping support rod, There will be a collision between the outer cylinder and the box. During work, the shock absorption of the drum washing machine mainly occurs during the dehydration process. The amount of clothes and washing water in the inner cylinder will affect the size of the centrifugal force. When the inner cylinder is dehydrated, the clothes will The water in the bucket is a process of gradually decreasing. If the clothes in the inner bucket are not balanced at the beginning of dehydration, the centrifugal force generated during rotation is often greater than the shock absorption limit of the tension spring and the damping support rod, resulting in a larger vibration of the inner bucket. The noise, the damage to the tension spring and damping support rod is also greater. Therefore, in the prior art, the dehydration speed is often reduced to reduce noise, which not only affects the dehydration effect, but also reduces work efficiency.

A drum-type washing machine is disclosed in Patent No. 00800325.4, which uses a damping support rod installed below the outer cylinder and a tension spring above it to support the outer cylinder and reduce noise. The structure of the damping support rod adopts various methods. Including the piston method and the spring method, this solution uses the restriction of the displacement of the outer cylinder to relieve the centrifugal force on the outer cylinder, but like other drum washing machines, the weight of the outer cylinder is mainly borne by the upper tension spring, resulting in the diameter of the tension spring Increase, the extension spring of the washing machine is in a stressed state whether it is working or not, which increases the failure coefficient of the extension spring, and a larger counterweight cannot be installed, so that the centrifugal force that the whole washing machine is subjected to is difficult to balance.

Contents of the invention

In order to improve the damping effect of the damping device of the drum washing machine in the prior art, reduce the vibration and noise when the inner cylinder is dehydrated, and reduce the load-bearing capacity of the extension spring, the present invention provides a device that increases the self-weight of the outer cylinder and simultaneously increases the support compression spring of the outer cylinder. , and changing the installation position of the tension spring and the damping support rod to realize the technical solution of reducing the vibration amplitude of the inner cylinder, reducing the noise of the drum washing machine, and reducing the load of the tension spring. The specific content is as follows: a shock absorbing device for a drum washing machine, including a shell, The outer cylinder, the tension spring connected above the outer cylinder, the damping support rod installed under the outer cylinder, the open end and the bottom end of the outer cylinder are respectively provided with a front counterweight and a rear counterweight, which is characterized in that the lower part of the outer cylinder is installed There are two stage clips, and the two stage clips are respectively installed on both sides of the axis of the outer cylinder bottom.

Another preferred solution of the present invention: the outer cylinder, the front counterweight and the rear counterweight are connected and fixed together by a metal connecting rod.

Another preferred solution of the present invention: a tension spring hook is fixed on the metal connecting rod, one end of the tension spring is connected to the metal connecting rod through the tension spring hook and the outer cylinder is pulled, and the other end is hung on the upper end of the housing.

Another preferred solution of the present invention: the support and the support platform are respectively provided with opposite elastic protruding limiters whose outer diameter is smaller than the inner diameter of the compression spring, and the two ends of the compression spring are respectively sleeved on the support and the support platform. protruding limit platform.

Another preferred solution of the present invention: the front counterweight has a ring structure and is installed on the open end of the outer cylinder or sleeved outside the open end of the outer cylinder, and the rear counterweight is annular or U-shaped.

Another preferred solution of the present invention: the four sides of the rear counterweight are provided with a limit platform stuck around the bottom of the outer cylinder, and the rear counterweight is provided with two supports perpendicular to the ground and located on both sides of the axis of the outer cylinder. The support platform of the U-shaped counterweight is the two ends of the U-shaped opening. Two supports are arranged on the box opposite to the support platform. One end of the compression spring is installed on the support platform, and the other end is installed on the support platform. seat.

Another preferred solution of the present invention: the side of the front counterweight in contact with the open end of the outer cylinder and/or the side of the rear counterweight in contact with the bottom of the outer cylinder are respectively provided with engaging structures that cooperate with each other, and the engaging structures are The protruding post arranged on the front counterweight and/or the rear counterweight is arranged on the opening end of the washing machine and/or the groove at the corresponding position on the bottom of the washing machine.

Another preferred solution of the present invention: the front counterweight and the rear counterweight are provided with protruding fixing platforms, threaded holes or through holes are opened on the fixing platforms, threads are provided at both ends of the metal connecting rod, metal The connecting rod is fixed on the fixed platform of the front counterweight and the rear counterweight by threads or nuts at both ends.

Another preferred solution of the present invention: a through hole through which the metal connecting rod passes is provided on the middle radial joint portion of the outer cylinder.

Another preferred solution of the present invention: a bent portion is provided in the middle of the metal connecting rod, and the bent portion is clamped on the middle radial joint portion of the outer cylinder.

In the prior art, the drum washing machine is equipped with balance weights on the outer cylinder to balance the center of gravity of the front and rear ends of the outer cylinder to offset the centrifugal force on the outer cylinder, and at the same time adjust the positional relationship between the damping support rod and the center of gravity of the outer cylinder to achieve the best shock absorption effect. . One of the purposes of adding the front counterweight and the rear counterweight to the outer cylinder in this program is to increase the weight of the outer cylinder itself to increase the upper limit of offsetting the centrifugal force of the inner cylinder. The second is to use the metal connecting rod between the front and rear counterweights To strengthen the overall structure of the outer cylinder and improve the service life of the outer cylinder. In this scheme, compression springs are installed on both sides of the axis of the bottom of the outer cylinder to share the weight of the outer cylinder and the weight of the counterweight, which can reduce the gravity on the damping support rod and the extension spring, reduce the required strength of the extension spring and the damping support rod, and extend the damping The service life of the support rod and the extension spring is improved, and the vibration and noise of the entire drum washing machine are controlled within a certain range, so as to achieve the purpose of reducing vibration and eliminating noise. After adopting the compression spring, when the washing machine is not in use, most of the gravity of the outer cylinder is borne by the compression spring, which reduces the load of the extension spring, prevents the extension spring and the damping support rod from being under stress all the time, and reduces the tension between the extension spring and the damping support rod. Fatigue strength of damper struts. In this scheme, the tension spring is not connected to the middle radial joint of the outer cylinder but is hung on the metal connecting rod, which reduces the influence on the structure of the outer cylinder. The connection position of the tension spring and the outer cylinder is close to the opening end of the outer cylinder, so that the outer cylinder The gravity is concentrated at the bottom of the outer cylinder and shared by the compression spring, which further reduces the burden on the tension spring. In addition, when the compression spring bears the gravity in the vertical direction, it can also offset part of the centrifugal force, so as to further reduce the vibration amplitude and noise of the front-loading washing machine. Effect.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of the present invention.

Figure 2 is a side view of the installation of the present invention.

Figure 3 is a schematic diagram of the structure of the front counterweight.

Figure 4 is a schematic diagram of the structure of the rear counterweight.

Fig. 5 is a schematic diagram of the structure of the extension spring hook.

Fig. 6 Schematic diagram of metal connecting rod structure.

Fig. 7 is a schematic diagram of the structure of the compression spring.

Fig. 8 is a schematic diagram of the structure of the support and the protruding limit platform on the support seat.

Explanation of symbols in the accompanying drawings: 1-outward, 2-tension spring, 3-damping support rod, 4-front counterweight, 41-fixed platform, 42-protruding column, 5-pressure spring, 6-support, 61- Elastic protruding limit platform, 7-rear counterweight, 71-limit platform, 72-fixing hole, 73-support platform, 731-elastic protruding limit platform, 8-metal connecting rod, 81-thread, 9 -extension spring hook, 10-middle radial joint, 101-through hole.

detailed description

According to the principle that the larger the weight of the object is, the smaller the effect will be when the force of the same magnitude acts on it. A counterweight is added to the outer cylinder to increase the weight of the entire outer cylinder to reduce the influence of the centrifugal force of the inner cylinder. After the counterweight is installed, the centrifugal force acting on the outer cylinder is partially offset by its own weight, and the rest is completely within the control range of the tension spring and the damping support rod, which avoids the problems of excessive vibration and noise during dehydration of the drum washing machine. The specific size and number of counterweights need to be determined according to the washing volume of the drum washing machine. Since the outer cylinder of the drum washing machine does not rotate with the inner tub, the installation position of the counterweight needs to be set according to the change of the center of gravity of the outer cylinder. This solution changes the existing In the technology, the installation method of counterweights is prepared locally on the outer cylinder, and the counterweights are set into an overall structure that matches the shape of the outer cylinder, including ring and U shapes, so that the entire weight of the counterweights is shared on the installation surface of the outer cylinder In addition, it avoids the problem that the outer cylinder is partially compressed and easily deformed, and it is easy to install.

After increasing the weight of the outer cylinder, this plan adopts a new support structure at the bottom of the outer cylinder, that is, the compression spring installed on both sides of the axis of the bottom of the outer cylinder is used to bear the main weight of the outer cylinder, so as to reduce the burden of the extension spring, and the compression spring The performance parameters can be determined according to the specific washing parameters of the washing machine. The setting points of the compression spring and the damping support rod are staggered. The general damping support rod is supported on both sides of the bottom of the outer cylinder in a figure-eight shape, and the compression spring needs to bear the center of gravity of the outer cylinder, so it needs to be installed vertically on the bottom of the outer cylinder, so that the compression spring It can not only support the counterweight to bear the weight of the outer cylinder, but also reduce the load bearing of the damping support rod. The damping support rod only needs to be responsible for reducing or eliminating the centrifugal force on the outer cylinder when the washing machine is working, so as to reduce the wear of the damping support rod And the purpose of extending the life of the damping support rod. In addition, the structure of the compression spring is relatively simple relative to the damping support rod, and the replacement is also more convenient. The compression spring on the outer cylinder can also greatly reduce the tension on the extension spring, so that the weight of the drum washing machine is completely borne by the compression spring when it is not working, so as to avoid elastic fatigue of the extension spring due to constant force, resulting in a reduction in service life , In this way, some extension springs with low elastic strength can also be used to reduce costs.

In addition, the connection between the extension spring and the outer cylinder in the prior art is mostly connected to the radial junction of the outer cylinder. Since the outer cylinder is made of plastic, the extension spring will cause certain damage to the structure of the outer cylinder after being pulled for a long time. In this plan, the connection point between the tension spring and the outer cylinder is set on the metal connecting rod connecting the front counterweight and the rear counterweight, and a fixed ring hook is set on the cross bar to make the tension spring and the metal connecting rod The connection point of the extension spring is fixed, so that the pulling force of the extension spring is completely shared by the front counterweight and the rear counterweight, which avoids the impact of the extension spring on the outer cylinder in the prior art.

Example 1:

As shown in Figures 1, 2, and 3, in this plan, a front counterweight 4 is provided at the opening end of the outer cylinder 1. The front counterweight adopts a ring-shaped integrated structure, and its inner diameter is consistent with the inner diameter of the opening end of the outer cylinder. The counterweight 4 is provided with an engaging structure that is in contact with the open end of the outer cylinder to facilitate the installation and alignment of the front counterweight, and can also prevent the front counterweight from moving radially relative to the outer cylinder after the front counterweight is fixed. The combined structure includes a protruding cylinder 42 on the front counterweight, and a corresponding groove on the installation surface of the outer cylinder. When installing, insert the cylinder on the front counterweight into the groove on the open end surface of the outer cylinder, and then insert the front The counterweight is fixed on the open end of the outer cylinder by means of bonding, bolts, snap-fit, etc. Of course, the front counterweight can also be directly sleeved on the open end with an inner diameter larger than the outer diameter of the outer cylinder open end, thus increasing the The counterweight of the outer cylinder does not increase the length of the outer cylinder and reduces the volume of the entire drum washing machine. After increasing the counterweight on the outer cylinder, it is necessary to increase the strength of the damping support rod 3 at the bottom of the outer cylinder to bear the weight of the front counterweight, and at the same time strengthen the elastic strength of the extension spring 2 at the upper end of the outer cylinder. After increasing the counterweight of the outer cylinder, the centrifugal force transmitted on the inner cylinder first needs to overcome the self-weight of the outer cylinder, which offsets a part of the centrifugal force, reduces the total centrifugal force that the tension spring and the damping support rod need to overcome, and finally reduces the overall washing machine. vibration and noise.

Example 2:

As shown in Figures 1 and 3, a rear counterweight 7 is added to the bottom of the outer cylinder of the drum washing machine. The specific size and shape of the rear counterweight need to consider the washing volume of the drum washing machine, the self-weight of the outer cylinder and the front counterweight. weight and other factors, the rear counterweight includes ring-shaped counterweight and U-shaped counterweight. The edge of the weight is provided with a fixed platform 71 for engaging or clamping the bottom of the outer cylinder. Similarly, the rear counterweight can also adopt the same engaging structure as the front counterweight, that is, the rear counterweight is fixed after being inserted into the bottom of the outer cylinder in a manner corresponding to the convex groove. After installation, the counterweight is more conducive to the elimination of centrifugal force, because most of the outer drums of drum washing machines are installed with the rear part inclined downward, so that the clothes and water are relatively concentrated in the second half of the outer drum during dehydration or washing. , so that the centrifugal force of the raw material here is also relatively large. After installing the counterweight, the stability of the rear of the outer cylinder is increased, and the main source of centrifugal force is greatly reduced, thereby reducing the vibration and vibration of the entire drum washing machine for the damping support rod and tension spring. Noise provides the basis. After adding the rear counterweight, it is also necessary to adjust the adaptive strength of the damping support rod and the extension spring.

Example 3:

As shown in Figures 1 and 2, on the basis of the foregoing embodiments, a front counterweight 4 and a rear counterweight 7 are respectively installed at the front and rear ends of the outer cylinder of the drum washing machine at the same time, and such an installation method can adjust the outer cylinder. The distribution of the center of gravity is beneficial to the damping performance of the damping support rods 3 and the extension springs 2, and prevents the damping support rods and extension springs at one end or somewhere from being subject to a large centrifugal force for a long time, thereby causing premature damage. As shown in Figure 6, the front counterweight 4 and the rear counterweight 7 are fixed together by a metal connecting rod 8, and as shown in Figures 3 and 4, a protrusion is set on the front counterweight 4 and the rear counterweight 7. The fixed table 41 and the limit table 71 of the diameter of the outer cylinder have an internal thread hole or a fixed hole 72 through the fixed table, and the two ends of the metal connecting rod 8 are inserted into the fixed holes on the front counterweight and the rear counterweight. Inside, the front counterweight and the rear counterweight are connected and fixed on the outer cylinder. This installation method can form the front counterweight and the rear counterweight as a whole, and protect and strengthen the outer cylinder, and also avoid the possibility of excessive local load on the outer cylinder caused by the direct installation of the counterweight on the outer cylinder. Deformation problem. The two ends of the metal connecting rod are provided with threads 81, and after the metal connecting rod passes through the fixing holes on the front counterweight and the rear counterweight, the two ends of the metal connecting rod are fixed on the front counterweight and the rear counterweight by nuts. On the rear counterweight, it is also possible to directly screw the metal connecting rod into the fixing hole and directly fix it with threads. The metal connecting rod can also use one end larger than the diameter of the fixing hole, and the other end adopts a threaded method. After the metal connecting rod passes through the fixing holes of the front counterweight and the rear counterweight in turn, the metal connecting rod is passed through with a nut. end fixed.

Example 4:

As shown in Figures 1, 2, and 5, on the basis of Embodiment 3, this solution changes the connection mode between the extension spring and the outer cylinder, and uses the ring-shaped extension spring hook 9 to connect the extension spring 2 and the metal connecting rod 8 together. The extension spring hook is fixed on the metal connecting rod 8, one end of the extension spring is directly hung on the extension spring hook, and the other end is hung on the box body, and the extension spring hook is fixed on the metal connecting rod by screws. The center of gravity adjusts the hooking position of the extension spring at any time, avoiding damage to the outer barrel when the extension spring is directly attached to the outer barrel.

Example 5:

As shown in Figures 1 and 2, on the basis of the foregoing embodiments, this solution is to reduce the gravity on the damping support rod 3 and the extension spring 2. As shown in Figure 7, a compression spring 5 is arranged at the bottom of the outer cylinder, and the The purpose of installation is to bear the weight of the entire outer cylinder, including the weight of the inner cylinder, clothes, and washing water. Therefore, it should be installed at the center of gravity of the outer cylinder as much as possible, or a figure-eight installation method can be used to bear the weight and reduce vibration. In order to avoid deformation of the outer cylinder due to direct force, this solution sets the support point of the pressure spring on the rear counterweight 7. When the structure of the annular counterweight is adopted, two support platforms 73 are extended to the left and right in a symmetrical manner. , the supporting platforms are respectively located on both sides of the axis and perpendicular to the ground. The two ends of the block are used as the support platform 73 of the fixed stage clip, and two supports 6 are set on the position corresponding to the box body and the support platform, as shown in Figure 8, the outer diameter is set on the opposite surface of the support and the support platform. The protruding limiters 61, 731 which are smaller than the inner diameter of the stage clip 5, the two ends of the stage clip are respectively placed on the two protruding limiters and supported between the support and the support platform, and the two stage clips after installation are vertical It is supported under the outer cylinder. In addition, because the compression spring needs to directly bear the weight of the outer cylinder, the compression spring needs to use a stronger tension spring. Because the compression spring is not only subjected to vertical action when the drum washing machine is working, but also to the left and right. Centrifugal force, in order to increase the adaptability of the compression spring and improve the shock absorption effect, the protruding limiter is made of elastic material, which can ease the various effects of the compression spring and avoid the wear caused by the rigid connection.

On the drum washing machine with a small washing volume, the compression spring can be directly set on the center of gravity line of the outer cylinder. The installation method of the compression spring can be directly distributed on the center of gravity line to share the weight of the outer cylinder. shock. Also according to the inclination angle of the urceolus, a stage clip is installed on the center of gravity line of the front end of the urceolus, and two stage clips are installed in a left-right symmetrical manner at the bottom of the urceolus. It is also possible to install four in a symmetrical manner at the front and rear ends respectively. The strength and installation method of the compression spring need to be considered uniformly according to the inclination angle of the outer cylinder, the weight of the total counterweight installed, the washing volume and other factors, but the fundamental point is to bear the total weight while reducing the damping support rod and pull The burden of the spring can achieve better shock absorption and noise reduction effects.

After installing the compression spring at the bottom of the outer cylinder, install two tension springs on the upper part of the outer cylinder and close to the open end of the outer cylinder. Since the center of gravity of the outer cylinder is mainly concentrated on the bottom of the outer cylinder, the tension springs near the open end of the outer cylinder can reduce the tension of the outer cylinder. The shaking range of the opening end reduces the elastic strength and quantity of the extension spring while reducing the noise of the washing machine.

Claims (8)

1. A damping device for a drum washing machine, comprising a housing, an outer cylinder (1), a tension spring (2) connected to the top of the outer cylinder (1), a damping support rod (3) installed below the outer cylinder, and the outer cylinder ( 1) The open end and the bottom end are respectively provided with a front counterweight (4) and a rear counterweight (7), which is characterized in that two compression springs (5) are installed under the outer cylinder (1), Compression springs (5) are respectively installed on both sides of the axis of the bottom of the outer cylinder, and the outer cylinder (1), front counterweight (4) and rear counterweight (7) are connected and fixed together by metal connecting rods (8), The front counterweight (4) and the rear counterweight (7) are provided with a fixed platform (41) and a limit platform (71) protruding from the diameter of the outer cylinder, and the fixed platform is provided with internally threaded holes or through-hole fixed holes ( 72), the two ends of the metal connecting rod (8) are inserted in the fixing holes on the front counterweight and the rear counterweight, and the front counterweight and the rear counterweight are connected and fixed on the outer cylinder. 2. The damping device according to claim 1, characterized in that, a tension spring hook (9) is fixed on the metal connecting rod (8), and one end of the tension spring (2) is connected to the metal through the tension spring hook (9). The connecting rod (8) is connected and pulls the outer cylinder (1), and the other end is suspended on the upper end of the housing. 3. The damping device as claimed in claim 2, characterized in that, the support (6) and the support platform (73) are respectively provided with relative elastic protruding spacers (61, 61, 731), the two ends of stage clip are respectively enclosed within on the protruding limit platform on bearing and support platform. 4. The shock absorbing device according to claim 3, characterized in that, the front counterweight (4) is an annular structure and is installed on the open end face of the outer cylinder or is sleeved outside the open end of the outer cylinder, and the rear counterweight (7) is annular or U-shaped. 5. The shock absorbing device according to claim 4, characterized in that, the rear counterweight (7) is provided with a limiting platform (71) that is stuck around the bottom of the outer cylinder around the rear counterweight (7), and the rear counterweight is provided with Two support platforms (73) perpendicular to the ground and located on both sides of the outer cylinder axis, wherein the support platforms of the U-shaped counterweight are the two ends of the U-shaped opening, and the box body opposite to the support platform is provided with two Bearing (6), an end of stage clip (5) is installed on the support platform (73), and the other end is installed on the bearing (6). 6. The shock absorbing device according to claim 5, characterized in that, one side of the front counterweight (4) in contact with the open end of the outer tube and/or one side of the rear counterweight (7) in contact with the bottom of the outer tube are respectively There are interfitting snap-in structures, the snap-in structures are bosses (42) arranged on the front counterweight (4) and/or the rear counterweight (7), arranged at the opening end of the washing machine and/or The corresponding groove on the bottom of the washing machine. 7. The shock absorbing device according to claim 1, characterized in that, a through hole (101) through which a metal connecting rod passes is provided on the middle radial joint portion (10) of the outer cylinder. 8. The shock absorbing device according to claim 1, characterized in that a bent part is provided in the middle of the metal connecting rod (8), and the bent part is clamped on the middle radial joint part (10) of the outer cylinder.