JP2015154879A - washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine in which a vibration control device for efficiently canceling resonance vibration that causes the whole washing machine body to vibrate greatly laterally is provided and which suppresses vibration of the washing machine body which occurs especially upon starting of a dewatering operation.

SOLUTION: A washing machine is configured as follows. The washing machine includes: an outer tub 33 elastically supported in a washing machine body 30; a washing and dewatering tub 34 rotatably provided in the outer tub 33; a drive device 35 for rotating the washing and dewatering tub 34; and a vibration control device 41 for suppressing the vibration of the washing machine body 30. The vibration control device 41 includes: a movement part 42 capable of moving in a lateral direction of the washing machine body 30; a base 43 for supporting the movement part 42 in a movable manner; a weight 44 provided at the movement part 42; and an elastic support part 45 including an elastic body which elastically supports the movement part 42 and restricts the movement. The base 43 is fixed at the washing machine body 30. Here, a resonance frequency of a vibration system composed of the movement part 42 having the weight 44 and the elastic support part 45 is set to a resonance frequency of the washing machine body 30 or a frequency near this resonance frequency.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a washing machine that performs a series of operations of washing, rinsing, and dehydrating laundry in a washing and dewatering tub that is rotatably disposed in an outer tub.

  Conventionally, in this type of washing machine, a plate-like vibration absorber having a specific natural frequency is attached to the side wall of the washing machine main body, and the vibration period and vibration of the vibration absorber due to resonance of the side wall of the washing machine main body during steady dehydration. The vibration of the side wall of the washing machine body is canceled by shifting the period by half wavelength (see, for example, Patent Document 1).

  6 (a) is a side sectional view of a conventional washing machine described in Patent Document 1, and FIG. 6 (b) shows a configuration of a dynamic vibration absorber attached to a main body side wall of the conventional washing machine. It is. As shown in FIGS. 6 (a) and 6 (b), the vibration absorber 3 has a plate-like vibrating portion 4 attached to the side wall 2 of the washing machine main body 1 via an attachment base 5. The plate-like vibration part 4 has a specific resonance frequency. When the vibration period of the side wall 2 of the washing machine main body 1 in the steady state of the dehydration operation matches the vibration period of the resonance vibration of the vibration part 4, the vibration part 4. Vibrates with a half-wave shift from the vibration period of the side wall 2 of the washing machine body 1. Therefore, the vibration of the side wall 2 of the washing machine body 1 is canceled out, and the vibration of the side wall 2 of the washing machine body 1 is reduced.

  In addition, there has been a case where a dynamic vibration absorber made of a weight and an elastic body is attached to the upper part of the washing machine body to reduce the resonance vibration of the washing machine body (for example, see Patent Document 2).

JP-A-4-352994 JP 2006-204564 A

  However, in the conventional configuration, since the vibration part 4 as the vibration absorber 3 is attached to the side wall 2 of the washing machine main body 1, it is effective when only the side wall 2 of the washing machine main body 1 is resonantly vibrated. There is little effect on the resonant vibration mode in which the entire washing machine main body 1 generated at the start of operation is greatly shaken sideways. In addition, since the elastic body of the mounting base 5 can be deformed in the horizontal, front-rear, and vertical directions, the vibration unit 4 vibrates simultaneously in each direction, and the vibration damping capability is dispersed. There has been a problem that the damping capacity is reduced with respect to lateral vibration.

  The present invention solves the above-described conventional problems, and provides a vibration damping device that effectively cancels resonance vibrations that the entire washing machine body largely shakes sideways, and in particular, vibrations of the washing machine body that are generated when the dehydration operation is started. It aims at providing the washing machine which suppresses.

In order to solve the conventional problems, a washing machine of the present invention includes an outer tub elastically supported in a washing machine body, a washing / dehydrating tub rotatably provided in the outer tub, and the washing / dehydrating tub. A drive device for rotating the dewatering tub and a vibration control device for suppressing vibration of the washing machine body, the vibration control device moving in the lateral direction of the washing machine body, and moving the movement unit A base that can be supported, a weight provided in the moving part, and an elastic support part that is made of an elastic body that elastically supports the moving part and restricts movement, and the base is the washing machine body. The resonance frequency of the vibration system composed of the moving part having the weight and the elastic support part is set to be the resonance frequency of the washing machine body or the vicinity thereof.

  As a result, the vibration damping device will exhibit the maximum vibration damping capability in the lateral direction, and the resonance vibration that is greatly shaken to the side of the washing machine body will be offset and reduced efficiently, especially in the washing that occurs at the start of the dewatering operation. The vibration of the machine body can be effectively suppressed.

  The washing machine of the present invention is provided with a vibration damping device in the washing machine body that can effectively suppress the vibration in the transverse direction, which is the resonance vibration mode of the washing machine body, so that the washing machine body can be efficiently damped. A large roll of the washing machine body can be effectively reduced.

Side surface sectional drawing of the washing machine in Embodiment 1 of this invention The top view of the state which removed the upper surface cover of the washing machine in this Embodiment The principal part enlarged view of the vibration damping device vicinity of the washing machine in this Embodiment Side surface sectional drawing of the washing machine in Embodiment 2 of this invention Side surface sectional drawing of the washing machine in Embodiment 3 of this invention (A) Side sectional view of a conventional washing machine (b) Configuration diagram of a vibration absorber of a conventional washing machine

  A washing machine according to a first aspect of the present invention includes an outer tub elastically supported in a washing machine body, a washing / dehydration tub rotatably provided in the outer tub, and a drive device for rotating the washing / dehydration tub. A damping device that suppresses vibration of the washing machine body, the damping device being movable in a lateral direction of the washing machine body, a base that movably supports the moving part, A weight provided on the moving portion; and an elastic support portion made of an elastic body that elastically supports the moving portion and restricts movement, and the base is fixed to the washing machine body and has the weight. The resonance frequency of the vibration system constituted by the moving part and the elastic support part is configured to be at or near the resonance frequency of the washing machine body.

  As a result, the vibration damping device will exhibit the maximum vibration damping capability in the lateral direction, and the resonance vibration that is greatly shaken laterally during operation of the washing machine main body will be offset and reduced efficiently, especially when dehydration operation is started. The vibration of the washing machine body can be suppressed.

  According to a second aspect of the present invention, in the washing machine of the first aspect, the vibration damping device has the base fixed to the bottom of the washing machine body. Thereby, a vibration damping device is provided at the bottom of the washing machine body to which the vibration of the outer tub is transmitted from the damper, and the resonance vibration of the washing machine body during operation can be efficiently reduced.

  According to a third aspect of the present invention, in the washing machine according to the first aspect, the vibration damping device has the base fixed to an upper portion of the washing machine main body. As a result, the vibration damping device is provided on the upper part of the washing machine main body where the resonance vibration amplitude of the washing machine main body is increased, and the resonance vibration of the washing machine main body during operation can be more effectively reduced.

  According to a fourth invention, in the washing machine according to any one of the first to third inventions, the vibration damping device is configured such that the moving part itself becomes the weight. As a result, the number of parts constituting the vibration damping device is reduced, and the resonance vibration of the washing machine body can be reduced at a low cost.

According to a fifth invention, in the washing machine according to any one of the first to third inventions, the washing machine further includes a drying device that circulates warm air to perform a drying operation, and the vibration control device attaches the weight to the drying device. It consists of components. As a result, it is possible to use the existing weight for the weight of the vibration damping device, and it is possible to configure the vibration damping device at a lower cost, and to increase the vibration damping capability because a drying device having a large mass is used for the weight. Thus, the resonance vibration of the washing machine main body during operation can be further reduced and effectively reduced.

  According to a sixth invention, in the washing machine according to any one of the first to fifth inventions, the elastic support portion is a viscoelastic body having a damping characteristic instead of the elastic body. Thereby, the range of the frequency which a damping device exhibits damping capability can be expanded, and it can respond even if the resonance frequency of a washing machine main body shifts.

  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)
1 is a cross-sectional view of a washing machine according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the washing machine according to the present embodiment with the top cover removed. FIG. 3 is an enlarged view of a main part in the vicinity of the vibration damping device of the washing machine in the present embodiment.

  1 to 3, a washing machine main body 30 includes an outer tub 33, a washing / dehydrating tub 34 provided in the outer tub 33 for storing objects to be cleaned such as clothes, and a washing / dehydrating tub 34. A drive device 35 that rotates and a vibration control device 41 that suppresses vibration of the washing machine body 30 are provided. The washing machine body 30 elastically supports the lower part of the outer tub 33 by two compression springs 31 and two dampers 32. A tension spring 31 a provided between the washing machine body 30 and the upper part of the outer tub 33 ensures the posture of the outer tub 33. The washing / dehydrating tub 34 is rotatably provided in the outer tub 33. The direction of the rotation axis of the washing and dewatering tub 34 is slightly inclined in the horizontal direction or the front side (left side in FIG. 1) of the washing machine body 30 upward as shown in FIG. The drive device 35 is composed of a brushless DC motor, and is controlled by an inverter so that the rotation speed can be freely changed. The driving device 35 is disposed below the outer tub 33 and rotates the washing / dehydrating tub 34 via a motor pulley 35a, a driving belt 35b, and a washing / dehydrating tub pulley 34a.

  The water supply device 36 is provided in the upper part of the washing machine main body 30 and supplies water into the outer tub 33 and the washing / dehydrating tub 34. The water level detection device 37 detects the water level of the washing liquid in the outer tub 33. The drainage device 38 is provided below the outer tub 33 and drains the washing liquid in the outer tub 33. The operation display device 40 for displaying the setting and setting contents of the driving course is provided at the upper part of the front surface of the washing machine body 30 (the left surface in FIG. 1), and the control device 39 is provided at the upper part in the washing machine body 30. It has been. The control device 39 controls the drive device 35, the water supply device 36, the drainage device 38, and the like based on the setting content input by the operation display device 40, and performs a series of operations of washing, rinsing, and dehydration.

  The vibration damping device 41 is fixed to a support portion 30 d provided at the rear upper part in the washing machine body 30. The vibration damping device 41 is movable in a lateral direction (depth and near side in FIGS. 1 and 3 and up and down in FIG. 2) to the left and right of the washing machine body 30 and the movable unit 42 is movable. It comprises a base 43 to be supported, a weight 44 provided on the moving part 42, and an elastic support part 45 provided so as to connect the moving part 42 and the washing machine body 30. Specifically, the moving part 42 has a protruding part 42a on the bottom surface, and the protruding part 42a fits into a recessed part 43a formed in the base 43 and slides smoothly and stably in the lateral direction along the recessed part 43a. To do. Although not shown, the base 43 is firmly fixed to the support portion 30d by a general method. The elastic support part 45 elastically supports the moving part 42 and limits the moving amount and moving speed of the moving part 42. For this purpose, one end 45a is fixed to the moving part 42 and the other end 45b is fixed to the back plate 30c of the washing machine body 30 so that it is deformed in the shearing direction by the sliding of the moving part 42 in the shear direction. Has been.

  And the resonance frequency of the vibration system constituted by the moving part 42 having the weight 44 as the vibration damping device 41 and the elastic support part 45 in this way is 8 Hz to 10 Hz or the vicinity of the resonance frequency of the washing machine body 30. It is set to resonate with the vibration of the washing machine body 30. The range near the resonance frequency is a range in which the vibration damping device 41 can resonate even a little near the resonance frequency to reduce the vibration of the washing machine body 30. In the present embodiment, the elastic support portion 45 is made of rubber as an elastic body with less vibration noise.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  After putting clothes and detergent into the washing and dewatering tub 34, the user operates the operation display device 40 to start operation of the washing machine. Accordingly, the control device 39 controls the water supply device 36 to supply water into the outer tub 33. At the same time, the drive device 35 is controlled to start the rotation of the washing and dewatering tub 34. The control device 39 stops water supply when a specified amount of water is supplied. The detergent is dissolved in water by the rotation of the washing and dewatering tank 34 and becomes a washing liquid and penetrates into the clothes. The control device 39 rotates the washing / dehydrating tub 34 at a low speed of about 30 r / min, and performs washing for lifting and dropping clothes for a predetermined time based on the setting. After the washing is finished, the drainage device 38 is operated, and the washing liquid containing dirt is drained out of the outer tub 33.

  After the drainage is completed, the rotation of the washing and dewatering tank 34 is gradually increased. At this time, the clothes that are biased in the washing and dewatering tub 34 are vibrated to vibrate the outer tub 33. This vibration energy is transmitted through the compression spring 31, the damper 32, and the tension spring 31a, and the washing machine body 30 is vibrated. This vibration is generated in the circumferential direction of the rotating shaft of the washing / dehydrating tub 34. And since a rotating shaft is substantially horizontal, it generate | occur | produces mainly in a horizontal direction and an up-down direction, but since the vibration of an up-down direction is suppressed by the weight of the washing machine main body 30, especially a horizontal direction vibration becomes large.

  For example, in the present embodiment, when the rotation speed of the washing and dewatering tub 34 becomes 480 r / min to 600 r / min which is the resonance rotation speed of the washing machine body 30 at the start of the dehydration operation, the washing machine body 30 is moved in the horizontal direction. Vibrates greatly. In this vibration mode, the vibration amplitude at the top of the washing machine body 30 is maximized. Therefore, the resonance frequency of the vibration damping device 41 fixed to the support portion 30d is set at or near this vibration frequency. Therefore, the moving part 42 of the vibration damping device 41 resonates by sliding in the lateral direction in the opposite phase due to the vibration of the washing machine body 30, and the vibration energy of the washing machine body 30 is consumed for sliding the moving part 42. Thus, the vibration of the washing machine body 30 is offset and reduced.

  Thus, the vibration energy of the washing machine body 30 is converted into the kinetic energy of the moving part 42 having the weight 44, so that the vibration energy of the washing machine body 30 is reduced and the vibration of the washing machine body 30 is reduced. . Further, since the moving part 42 is configured to slide only in the lateral direction, the vibration damping capability of the vibration damping device 41 is prevented from being dispersed, and the vibration energy of the lateral vibration that is the resonance vibration mode of the washing machine body 30 is reduced. It can be absorbed efficiently. Furthermore, by providing the vibration damping device 41 on the upper part of the washing machine body 30, the vibration energy of the washing machine body 30 can be efficiently transmitted to the moving part 42, and the vibration energy can be absorbed more effectively. .

  As described above, in the present embodiment, the vibration damping device 41 is fixed to the washing machine body 30, the moving unit 42 slides only in the lateral direction, and the resonance frequency is at or near the resonance frequency of the washing machine body 30. Therefore, it is possible to efficiently absorb the vibration energy of the transverse vibration which is the resonance vibration mode of the washing machine body 30, and to cancel the resonance vibration of the washing machine body 30 at the start of the dehydration operation. The dehydration operation can be started quietly with less vibration and less vibration.

  In the present embodiment, the moving part 42 slides on the base 43 with the protruding part 42a fitted into the concave part 43a. However, the structure for sliding the moving part 42 is not limited to this. Absent. For example, the arrangement positions of the protrusion and the recess may be reversed up and down, a rail and a roller may be combined, or a lubricating material may be used for the sliding surface. In short, it is only necessary that the moving unit 42 is configured to be able to smoothly and stably slide or move to resonate in response to the vibration of the washing machine body 30.

  Moreover, in this Embodiment, although the moving part 42 and the weight 44 of the damping device 41 were set as a different body, you may comprise these integrally. If configured separately, the weight 44 can be replaced and the resonance frequency of the vibration damping device 41 can be changed. However, if it is configured integrally, the number of parts constituting the vibration damping device 41 is reduced. The resonance vibration of the washing machine main body 30 can be reduced at a low cost.

  In the present embodiment, rubber is used as the elastic support portion 45 as an elastic body with less vibration sound. However, the elastic support portion 45 is not limited to this and may be an elastic body other than rubber. In addition to the elastic body, a viscoelastic body may be used. In the case of a viscoelastic body, for example, if the ratio of the mass of the washing machine main body 30 to the mass of the weight 44 is 0.1, the damping ratio of the viscoelastic body is set to about 0.2, so that washing is performed in a wide range. The resonance vibration of the machine body 30 can be reduced. And even if the resonance frequency of the washing machine main body 30 shifts, it can cope with a wider range than the elastic body.

  Further, the vibration in the lateral direction is not limited to when the dehydration operation is started, and the resonance frequency of the vibration damping device 41 may be set in accordance with an arbitrary operation state according to the operation characteristics of the washing machine.

(Embodiment 2)
FIG. 4 is a side cross-sectional view of the washing machine according to Embodiment 2 of the present invention. In FIG. 4, the vibration damping device 41 a is installed on the front side of the bottom 46 of the washing machine body 30. The configurations of the vibration damping device 41a and the washing machine main body 30 are the same as those in the first embodiment. The elastic support portion 45 has one end fixed to the moving portion 42 and the other end fixed to the front lower portion 47 of the washing machine body 30. The elastic support part 45 elastically supports the moving part 42 and deforms in the shearing direction when the moving part 42 slides in the lateral direction. The resonance frequency of the vibration control device 41 a is set to 8 Hz to 10 Hz, which is the resonance frequency of the washing machine body 30.

  By providing the vibration damping device 41a at the bottom 46 on the front side of the washing machine body 30, the vibration energy of the washing machine body 30 to which the vibration of the outer tub 33 is transmitted from the damper 32 can be efficiently transmitted to the moving unit. The vibration energy can be effectively absorbed. Accordingly, the resonance vibration can be canceled and efficiently reduced, and particularly, the resonance vibration of the washing machine body 30 at the start of the dehydration operation can be greatly reduced, and the dehydration can be started quietly with little vibration.

(Embodiment 3)
FIG. 5 is a side cross-sectional view of the washing machine according to Embodiment 3 of the present invention. In FIG. 5, the washing machine further includes a drying device 50 that performs a drying operation by circulating hot air in the direction of the arrow. The drying device 50 includes a blower device 51 and a heat pump device 52. The blower 51 includes a duct 51a that has an outlet 33a and an inlet 33b in the outer tub 33 and circulates drying air, and has a blower fan (not shown) and a filter 50b inside the duct 51a. A fan motor (not shown) for driving the blower fan is provided outside 51a. The heat pump device 52 includes a cooler (not shown) as a heat exchanger for dehumidification and a radiator (not shown) as a heat exchanger for heating inside the duct 51a. A compressor (not shown) that circulates refrigerant through the two heat exchangers is provided outside. The total mass is about 8 kg, for example. Other configurations as the washing machine are the same as those in the first embodiment.

  In the vibration damping device 41 b of the present embodiment, a weight 44 provided in the moving unit 42 is configured as a main component of the drying device 50. For example, a duct 51 a including a blower fan and a heat exchanger, a compressor, and a fan motor are provided in the moving unit 42. And in order to respond | correspond to the vibration of the moving part 42, the duct 51a is comprised by the flexible duct 50c before and behind provided in the moving part 42. As shown in FIG. Since the filter 50b is removable and needs to be cleaned, it is provided in the duct 51a on the outer tub 33 side from the flexible duct 50c and fixed to the washing machine body 30.

  In this way, by using a part having a large mass for the weight 44, the vibration damping capability of the vibration damping device 41 can be improved without increasing the amplitude of the resonance vibration. Further, since the drying device 50 is an existing part, it is not necessary to secure a new installation space. Further, since the amplitude of the resonance vibration of the weight 44 is small, the compressor, the heat exchanger, the blower fan, the fan motor, the blower duct, and the like, which are components of the drying device 50, are not damaged by the vibration.

  Accordingly, the vibration control device 41b can be configured at a lower cost, and the vibration control capability is increased by using the drying device 50 having a large mass for the weight 44. 30 resonance vibrations can be further reduced and effectively reduced.

  In the present embodiment, all the components of the drying device 50 are substituted for the weight 44. However, not all of the components are necessary, and some components of the drying device 50 can be appropriately adjusted. Further, it does not prevent the use of the adjustment weight 44 according to the required mass. Moreover, although the heat pump apparatus 52 was used for the drying apparatus 50, it is not restricted to this, For example, you may use an electric heater etc.

  As described above, the washing machine according to the present invention is provided with a vibration damping device in the washing machine body to cancel and reduce the resonance vibration during operation. It can be applied to reduce the resonance vibration of the main body.

DESCRIPTION OF SYMBOLS 30 Washing machine main body 31 Compression spring 31a Tension spring 32 Damper 33 Outer tub 34 Washing and dewatering tub 35 Drive device 41, 41a, 41b Vibration control device 42 Moving part 43 Base 44 Weight 45 Elastic support part 46 Bottom part 50 Drying device 51 Air blower 51a Duct 52 Heat pump device

Claims (6)

An outer tub elastically supported in the washing machine main body, a washing / dehydrating tub rotatably provided in the outer tub, a driving device for rotating the washing / dehydrating tub, and a vibration of the washing machine main body are suppressed. A vibration control device, wherein the vibration control device is movable in the lateral direction of the washing machine body, a base that supports the movement unit movably, a weight provided in the movement unit, An elastic support portion made of an elastic body that elastically supports the moving portion and restricts the movement, the base is fixed to the washing machine body, the moving portion having the weight, and the elastic support portion. The washing machine is configured such that the resonance frequency of the vibration system configured by is equal to or close to the resonance frequency of the washing machine body. The washing machine according to claim 1, wherein the vibration damping device has the base fixed to a bottom of the washing machine body. The washing machine according to claim 1, wherein the vibration damping device has the base fixed to an upper part of the washing machine body. The washing machine according to any one of claims 1 to 3, wherein the vibration damping device is configured such that the moving unit itself becomes the weight. The washing machine according to any one of claims 1 to 3, further comprising a drying device that circulates warm air to perform a drying operation, wherein the vibration control device includes the weight as a component of the drying device. . The washing machine according to any one of claims 1 to 5, wherein the elastic support portion is a viscoelastic body having a damping characteristic instead of the elastic body.

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