JP2010166941A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve low vibration and low noise by suppressing the vibration of a washing machine body from transmitting to an installation floor. <P>SOLUTION: The washing machine is constituted by arranging the second elastic bodies 41b for reducing the vibration of the washing machine body and an attenuating means 42 for attenuating the vibration energy of the washing machine body in the legs 41 supporting the washing machine body 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a washing machine that performs washing, rinsing, and dehydration (may be further performed until drying) of laundry.

  Conventionally, this type of washing machine has a large number of support legs mounted on a base fixed to the lower side of the washing machine main body so as to be movable in the vertical direction, and is attached to the lower end of the support leg to contact the bottom surface. And a spring attached between the base and the foot to give elasticity to the foot, and attached to the upper surface of the spring and the upper surface of the base to suppress resonance of the spring generated when the washing machine is driven. Then, what was comprised with the attenuation | damping unit which reduces a vibration was considered (for example, refer patent document 1). Moreover, what supported the washing machine main body by the elastic support leg which consists of a spring and the stopper which controls expansion / contraction of a spring to a fixed range was considered (for example, refer patent document 2).

  FIG. 11 shows a configuration of a conventional washing machine support device described in Patent Document 1. In FIG. As shown in FIG. 11, a support leg 12 that is inserted into the through hole 11 of the base 10 so as to be linearly movable in the vertical direction, and a foot that is attached to the lower end of the support leg 12 and contacts the bottom surface on which the washing machine is installed. 13, a spring 14 that elastically supports the foot 13, and a damping unit 15 that is attached to the upper surface of the base 10 and suppresses resonance of the spring 14 that occurs when the washing machine is driven to reduce vibration. Have.

  The damping unit 15 obtains a damping action by the friction member 17 rubbing against the inner peripheral surface of the housing 16. The support device configured in this manner maintains the balance of the washing machine by the elasticity of the spring 14, further absorbs vibration generated from the washing machine, reduces transmission of the washing machine vibration to the bottom surface, and It suppresses the resonance of the spring 14 and exhibits a damping function to reduce the vibration of the washing machine.

  FIG. 12 shows a configuration of a conventional leg device of a washing machine described in Patent Document 2. As shown in FIG. 12, the elastic support leg 1 is a combination of a coil spring 2 and a stopper 3, and the coil spring 2 is disposed inside a bottomed cylindrical cover 4 with the bottom 4A facing upward. The other end is supported by the stopper 3 via the disc-shaped support member 5 at one end on the bottom 4A.

The stopper 3 is provided with flanges 3A and 3B at both ends, and a shaft portion 3C between the flanges 3A and 3B passes through the cap 6 mounted in the opening of the cover 4 so as to slide freely in the vertical direction. Then, the flange 3A located above the cap 6 is brought into contact with the support member 5, and the flange 3B located below the cap 6 is grounded to the floor surface 8 via a grounding portion 7 formed in a disk shape. The stopper 3 is made of rubber or resin. By supporting the washing machine main body 9 with this elastic support leg 1, the vibration of the washing machine main body 9 is absorbed.
JP 2005-152659 A JP-A-4-244195

  However, in the conventional configuration described in Patent Document 1, since friction is used to obtain damping, damping force works in addition to resonance, and conversely, vibration of the washing machine body is transmitted to the floor surface. There was a problem of vibrating the floor greatly.

  Further, in the conventional configuration described in Patent Document 2, since the vibration at the time of resonance is regulated by the stopper without using the damping, the impact of the stopper is transmitted to the floor surface, and the vibration of the floor surface at the time of resonance. In addition, there was a problem that the noise increased.

  The present invention solves the above-described conventional problems, and effectively reduces the resonance vibration and stationary vibration of the washing machine body, and realizes low vibration and low noise of the washing machine body and reduced vibration of the installation floor. Objective.

  In order to solve the conventional problems, a washing machine of the present invention includes a washing machine body, an outer tub supported by a first elastic body provided at a bottom of the washing machine body, and the outer tub. A washing and dewatering tub provided rotatably; drive means for rotating the washing and dewatering tub; a damper for suppressing vibration of the outer tub; and a leg for supporting the washing machine main body; A second elastic body for reducing vibration of the washing machine main body and a damping means for attenuating vibration energy of the washing machine main body are provided.

  Accordingly, since there is no stopper that generates an impact, the resonance vibration of the washing machine body can be reliably reduced without any impact by the damping means. Moreover, since the vibration transmission energy with respect to the installation floor of the washing machine main body at the normal time can be reduced by the second elastic body, the vibration of the installation floor can be reduced.

  The washing machine of the present invention can reduce the resonance of the washing machine body, reduce the vibration transmission energy to the installation floor and reduce the vibration of the installation floor, and realize low vibration and low noise. be able to.

  The first invention includes a washing machine body, an outer tub supported by a first elastic body provided at the bottom of the washing machine body, and a washing and dewatering tub provided rotatably in the outer tub. And a driving means for rotating the washing and dewatering tub, a damper for suppressing vibration of the outer tub, and a leg for supporting the washing machine body, wherein the leg reduces vibration of the washing machine body. By providing an elastic body and a damping means for attenuating the vibration energy of the washing machine main body, there is no stopper that generates an impact, so that the resonance vibration of the washing machine main body can be reliably reduced without any impact by the damping means. be able to. Moreover, since the vibration transmission energy with respect to the installation floor of the washing machine main body at the normal time can be reduced by the second elastic body, the vibration of the installation floor can be reduced.

  In the second invention, in particular, the damping means of the first invention is composed of a cylinder and a piston, and a clearance for generating an air flow resistance is provided in the sliding part of the cylinder and the piston, so that at the time of resonance. When the washing machine body vibrates greatly and the displacement of the piston increases, the amount of air flowing through the gap between the cylinder and the piston increases, the flow resistance increases and the damping force is generated, so that the washing machine body vibration is suppressed. To work. In addition, the vibration of the washing machine body is small during steady state, the displacement of the piston is small, the amount of air flowing through the gap is reduced, the flow resistance is reduced, the damping force is reduced, and the vibration of the washing machine body is applied to the installation floor. The vibration energy of the washing machine main body is absorbed by the second elastic body and the vibration of the washing machine main body is not transmitted to the installation floor, so that vibration of the installation floor and noise generated thereby can be reduced. it can.

According to a third aspect of the present invention, in particular, the damping means of the first aspect comprises a cylinder and a piston, and maintains airtightness between the two chambers of the cylinder partitioned by the piston at the sliding portion of the cylinder and the piston. By providing a sealing body that provides a flow path for generating air flow resistance in the piston, air flow resistance is reliably generated, and stable damping performance can be obtained.

  In the fourth invention, in particular, the damping means of the first invention is provided with a flexible bag body in parallel with the second elastic body, and provided with a flow path for generating air flow resistance of the bag body. As a result, the seal body provided on the piston can be eliminated, and the sliding friction between the cylinder and the seal body is eliminated, so that the vibration of the washing machine main body in a steady state is less likely to vibrate the installation floor.

  According to a fifth aspect of the present invention, in particular, any one of the first to fourth aspect of the present invention includes a cylinder and a piston, and a connecting rod that connects the piston and a leg contacting the installation floor is connected to the connecting rod in the cylinder. A communication passage for allowing air to pass therethrough, a buffer body is provided so as to cover an outlet of the communication passage provided in the leg body, a through hole through which air enters and exits is provided, and the communication path is formed by deformation of the buffer body. By opening and closing the outlet, a damping force can be generated only during resonance, and the vibration of the washing machine body and the vibration of the installation floor can be minimized from the start of dehydration to the steady state.

  In the sixth aspect of the invention, in particular, the damping means of the fifth aspect of the invention provides reliable connection by deformation of the buffer body by providing a protrusion on the buffer body at a position facing the outlet of the communication path provided in the leg. The exit of the passage can be closed, and stable damping performance can be obtained.

  According to a seventh aspect of the invention, in particular, the damping means of the fifth or sixth aspect of the invention provides a shock absorber by vibration of the washing machine body by providing a protrusion on the grounding portion of the shock absorber in a range smaller than the area of the leg. Is easily deformed, the buffer performance is improved, the outlet of the communication path can be closed reliably, and a more stable damping performance can be obtained.

  In the eighth aspect of the invention, in particular, the damping means according to any one of the fifth to seventh aspects of the present invention is configured such that the thickness of the contact portion between the leg and the shock absorber is larger than that of the other portions, so that the shock absorber is moved up and down. Thus, the outlet of the communication path can be reliably opened and closed by the vertical vibration of the washing machine body at the time of resonance, and a more stable damping performance can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a washing machine according to the first embodiment of the present invention, and FIG. 2 is a sectional view of legs of the washing machine. 1 and 2, the outer tub 33 is elastically supported in the washing machine body 30 by two first elastic bodies 31 and two dampers 32. The washing / dehydrating tub 34 is rotatably disposed in the outer tub 33. The motor (driving means) 35 is composed of a brushless DC motor, and is controlled by an inverter so that the rotational speed can be freely changed. Then, the washing / dehydrating tub 34 is directly driven. The water supply means 36 supplies water into the washing / dehydrating tub 34. The water level detection means 37 detects the washing water level in the outer basket 33. The drainage means 38 drains the washing water in the outer tub 33.

  The control device 39 is provided at the lower front portion of the washing machine body 30. The control device 39 sequentially controls each step of washing, rinsing and dehydration based on the setting contents input by the operation display means 40 provided on the upper front of the washing machine body 30. The power switching means (FIG. The motor 35, the water supply means 36, the drainage means 38, etc. are sequentially controlled via a not-shown).

  The damper 32 is a viscous damper that uses oil as a working fluid, and reduces the resonance vibration amplitude of the outer tub 33 at the time of dehydration activation, and is buffered between the bottom plate 30 b of the washing machine body 30 and the bottom 33 a of the outer tub 33. It is rotatably fixed via the body 32a. The legs 41 are arranged at the four corners of the bottom plate 30 b of the washing machine body 30.

  The leg 41 includes a cylindrical case 41a, a second elastic body 41b provided in the case 41a and configured by a compression spring, a piston 41c that slides in an airtight manner in the case 41a, a piston 41c, and a leg 41d. Rod 41e for connecting the two. A bolt 41f for attaching the leg 41 to the bottom plate 30b of the washing machine body 30 is integrally provided on the upper portion of the case 41a. The surface of the leg 41d is covered with a rubber buffer 41g. A side hole of the case 41a is provided with a through hole 41h through which the air in the case 41a flows out or flows in by sliding of the piston 41c, and the resistance when the gas flows out or flows in acts as a damping force. 42 is constituted. The tension spring 43 maintains the posture of the outer tub 33 and is provided between the top plate 30 a and the outer tub 33.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, after putting clothes and detergent into the washing and dewatering tub 34, the operation display means 40 is operated to start operation. As a result, the water supply means 36 operates, the washing water is supplied into the washing / dehydrating tub 34, and the washing / dehydrating tub 34 also starts rotating. When the specified amount of washing water is supplied, the water supply means 36 stops water supply. By the rotation of the washing and dewatering tub 34, the detergent is dissolved in the washing water and becomes a washing liquid and penetrates into the clothes. The washing and dewatering tub 34 rotates at a low speed of about 30 r / min, and performs washing for a specified time in which clothes are lifted and dropped.

  After the washing is finished, the drainage means 38 is operated, and the washing water in which the dirt is dissolved is drained out of the outer tub 33. After the drainage is completed, the rotation of the washing and dewatering tub 34 is gradually accelerated and the dehydration process is started. At the time of dehydration activation, the outer tub 33 may move up and down greatly while swinging back and forth and left and right due to the unbalanced state of the laundry when the rotational speed of the washing and dewatering tub 34 is between 250 and 300 r / min. At this time, the vertical movement of the outer tub 33 is buffered by the elastic body 31 and attenuated by the damper 32. Further, vibration transmission of the outer tub 33 is also reduced. However, it is transmitted to the top plate 30a and the bottom plate 30b of the washing machine main body 30 via the elastic body 31, the damper 32, and the tension spring 43, and the washing machine main body 30 is vibrated.

  This vibration is transmitted to the installation floor (not shown) via the legs 41, and in the case of a soft floor, the floor vibrates greatly. However, since the vibration of the washing machine main body 30 is absorbed by the second elastic body 41b and is not transmitted to the installation floor, the floor does not vibrate greatly. When the rotation speed of the washing / dehydrating tub 34 increases and reaches around 10 Hz before the steady rotation, resonance occurs due to the mass of the second elastic body 41b and the washing machine body 30, and the washing machine body 30 starts resonance vibration. . This vibration also greatly vibrates the installation floor. However, since the damping means 42 functions and converts vibration energy into heat and consumes it, vibration amplitude and transmission to the floor are reduced.

  As described above, in the present embodiment, since there is no stopper that generates an impact, the resonance vibration of the washing machine body 30 can be reliably reduced by the damping means 42 without an impact. Moreover, since the vibration transmission energy with respect to the installation floor of the washing machine main body 30 in the steady state can be reduced by the second elastic body 41b, it is possible to reduce the vibration of the installation floor.

(Embodiment 2)
FIG. 3 shows a cross-sectional view of the legs of the washing machine according to the second embodiment of the present invention. In FIG. 3, the attenuating means 42 is constituted by a cylinder 41a and a piston 41c, and a clearance 44 for generating air flow resistance is provided at the sliding portion of the cylinder 41a and the piston 41c. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the first embodiment.

Thereby, when the washing machine main body 30 vibrates greatly at the time of resonance and the displacement amount of the piston 41c increases, the amount of air flowing through the gap between the cylinder 41a and the piston 41c also increases, the flow resistance increases, and the damping force is generated. It works to suppress the vibration of the washing machine body 30. Further, the vibration of the washing machine main body 30 is small at the normal time, the displacement amount of the piston 41c is small, the amount of air flowing through the gap 44 is also reduced, the flow resistance is reduced, the damping force is reduced, and the vibration of the washing machine main body 30 is reduced. Is not easily transmitted to the installation floor, and vibration energy of the washing machine main body 30 is absorbed by the second elastic body 41b, and vibration of the washing machine main body 30 is less likely to be transmitted to the installation floor. Noise can be reduced.

(Embodiment 3)
FIG. 4 shows a cross-sectional view of the legs of the washing machine according to the third embodiment of the present invention. In FIG. 4, the damping means 42 is composed of a cylinder 41a and a piston 41c, and a sealing body 46 that maintains airtightness between the two chambers of the cylinder 41a partitioned by the piston 41c on the sliding portion 45 of the cylinder 41a and the piston 41c. And a flow path 47 for generating air flow resistance in the piston 41c. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the first embodiment.

  As a result, air flow resistance is reliably generated and stable attenuation performance can be obtained.

(Embodiment 4)
FIG. 5 shows a cross-sectional view of the legs of the washing machine in the fourth embodiment of the present invention. In FIG. 5, a flexible rubber bag body 48 is provided inside the second elastic body 41 b in parallel with the second elastic body 41 b, and a flow that generates air flow resistance in the bag body 48 is generated. A passage 47 is provided in the piston 41c. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the first embodiment.

  As a result, the seal body 46 provided on the piston 41c can be eliminated, and the sliding friction between the cylinder 41a and the seal body 46 is eliminated, so that the vibration of the washing machine main body 30 in a steady state is less likely to vibrate the installation floor.

(Embodiment 5)
6 and 7 show sectional views of the legs of the washing machine in the fifth embodiment of the present invention. 6 and 7, the damping means 42 includes a cylinder 41a and a piston 41c, and a connecting passage 41e that connects the piston 41c and a leg 41d that is in contact with the installation floor is provided with a communication passage 49 through which air in the cylinder 41a passes. The buffer body 41g is provided so as to cover the outlet 49a of the communication passage 49 provided in the leg body 41d, the through hole 41i through which air enters and exits is provided in the leg body 41d, and the outlet 49a of the communication path 49 is formed by deformation of the buffer body 41g. It is designed to open and close. The communication path 49 has a larger cross-sectional area so that the flow resistance is smaller than that of the flow path 47. Other configurations are the same as those of the first to fourth embodiments, the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the first to fourth embodiments.

  When the rotation speed of the washing / dehydrating tub 34 increases and reaches around 10 Hz before the steady rotation, resonance occurs due to the mass of the second elastic body 41b and the washing machine body 30, and the washing machine body 30 starts resonance vibration. . This vibration also greatly vibrates the installation floor. At this time, the vibration of the washing machine main body 30 is transmitted through the second elastic body 41b, the piston 41c, the connecting rod 41e, and the leg body 41d to greatly deform the buffer body 41g. Due to the deformation of the buffer body 41g, the outlet 49a of the communication passage 49 is blocked, and the air in the bag body 48 flows through the flow path 47, thereby generating a flow resistance.

As a result, the damping means 42 functions to convert vibration energy into heat and consume it, so that vibration amplitude and transmission to the floor are reduced. Further, when the rotation speed of the washing and dewatering tub 34 further increases and reaches a steady rotation, the vibration of the washing machine body 30 is also reduced, and the buffer body 41g.
, The outlet 49a of the communication passage 49 opens, and the air in the bag body 48 flows through the communication passage 49, so that no flow resistance is generated and the damping force is reduced. Thus, the damping force can be generated only at the time of resonance, and the vibration of the washing machine main body 30 and the vibration of the installation floor can be minimized from the start of dehydration to the steady state.

(Embodiment 6)
FIG. 8 shows a cross-sectional view of the legs of the washing machine in the sixth embodiment of the present invention. In FIG. 8, a protrusion 50a that protrudes toward the outlet 49a is provided on the buffer body 50 at a position facing the outlet 49a of the communication passage 49 provided in the leg 41d. Other configurations are the same as those of the fifth embodiment, the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the fifth embodiment.

  As a result, the outlet 49a of the communication passage 49 can be reliably closed by deformation of the buffer body 41g, and stable damping performance can be obtained.

(Embodiment 7)
FIG. 9 shows a cross-sectional view of the legs of the washing machine in the seventh embodiment of the present invention. In FIG. 9, the grounding part 51 of the buffer body 41g is provided with a projecting part 51a that protrudes toward the installation surface in a range smaller than the area of the leg body 41d. Other configurations are the same as those in the fifth or sixth embodiment. The same components are denoted by the same reference numerals, and the detailed description thereof is the same as in the fifth or sixth embodiment.

  Thereby, the shock absorber 41g is easily deformed by the vibration of the washing machine main body 30, the shock absorbing performance is improved, the outlet 49a of the communication passage 49 can be closed reliably, and a more stable damping performance can be obtained. .

(Embodiment 8)
FIG. 10 shows a cross-sectional view of the legs of the washing machine in the eighth embodiment of the present invention. In FIG. 10, the thickness of the contact part 52 of the leg 41d and the buffer 41g is made thicker than other parts. Other configurations are the same as those of the fifth embodiment, and the same components are denoted by the same reference numerals, and the detailed descriptions thereof are the same as those of the fifth to seventh embodiments.

  As a result, the buffer body 41g is easily deformed up and down, and the outlet 49a of the communication passage 49 can be reliably opened and closed by the vertical vibration of the washing machine body 30 at the time of resonance, and further stable damping performance can be obtained. . Further, the durability is improved by increasing the thickness of the contact portion 52 where a large force is applied to the buffer body 41g.

  In each of the above embodiments, the rotation axis of the washing / dehydrating tub 34 is horizontal, but the same effect can be obtained even when the washing / dehydrating tub 34 is inclined forward and high.

  As described above, the washing machine according to the present invention can reduce the resonance of the washing machine main body, reduce the vibration transmission energy to the installation floor, reduce the vibration of the installation floor, and reduce the vibration. Therefore, it can be applied to vibration isolation of rotating machines other than washing machines.

Sectional drawing of the washing machine in Embodiment 1 of this invention Cross section of legs of the washing machine Sectional drawing of the leg of the washing machine in Embodiment 2 of this invention Sectional drawing of the leg of the washing machine in Embodiment 3 of this invention Sectional drawing of the leg of the washing machine in Embodiment 4 of this invention Sectional drawing of the leg of the washing machine in Embodiment 5 of this invention Cross section of legs of the washing machine Sectional drawing of the leg of the washing machine in Embodiment 6 of this invention Sectional drawing of the leg of the washing machine in Embodiment 7 of this invention Sectional drawing of the leg of the washing machine in Embodiment 8 of this invention Sectional view of a leg of a conventional washing machine Sectional view of a leg of a conventional washing machine

DESCRIPTION OF SYMBOLS 30 Washing machine main body 31 1st elastic body 32 Damper 33 Outer tank 34 Washing and dewatering tank 35 Drive means 41 Leg 41b 2nd elastic body 42 Damping means

Claims (8)

A washing machine body, an outer tub supported by a first elastic body provided at the bottom of the washing machine body, a washing / dehydration tub provided rotatably in the outer tub, and the washing / dehydration tub A second elastic body for reducing vibration of the washing machine main body on the leg, a driving means for rotating the damper, a damper for suppressing vibration of the outer tub, a leg for supporting the washing machine main body, and the washing A washing machine provided with damping means for damping the vibration energy of the machine body. The washing machine according to claim 1, wherein the damping means includes a cylinder and a piston, and a clearance for generating an air flow resistance is provided in a sliding portion between the cylinder and the piston. The damping means is composed of a cylinder and a piston, and a sealing body is provided on the sliding portion of the cylinder and the piston to maintain airtightness between the two chambers of the cylinder partitioned by the piston, and air flow resistance is provided to the piston. The washing machine according to claim 1, further comprising a flow path for generating water. The washing machine according to claim 1, wherein the damping means is provided with a flexible bag body in parallel with the second elastic body and provided with a flow path for generating air flow resistance of the bag body. The damping means is composed of a cylinder and a piston, and a connecting passage that connects the piston and a leg contacting the installation floor is provided with a communication path through which air in the cylinder passes, and an outlet of the communication path provided in the leg is provided. The buffer body is provided so as to cover, a through-hole through which air enters and exits the leg body, and the outlet of the communication path is opened and closed by deformation of the buffer body. Washing machine. The washing machine according to claim 5, wherein the damping means is provided with a protrusion on the buffer body at a position facing the outlet of the communication path provided on the leg. The washing machine according to claim 5 or 6, wherein the attenuating means is provided with a protrusion on the ground contact portion of the shock absorber in a range smaller than the area of the leg. The washing machine according to any one of claims 5 to 7, wherein the damping means is configured such that the thickness of the contact portion between the leg body and the buffer body is greater than that of other portions.

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