Drum-type washing machine

Abstract

The invention provides a drum-type washing machine capable of suppressing vibration in the front-back direction of an outer groove and suppressing increase of vibration transmitted to a box body and an installation floor, in a plan view of observing a clothes input opening part (11op) of the outer groove (11) from the front side, when a (Y-Y) dividing line passing through the center of the clothes input opening part in the gravity direction is virtually set, the clothes input opening part (11op) is separated from the center of the clothes input opening part (11op), and the clothes input opening part (11op) is separated from the center of the clothes input opening part (11op). At least one anti-vibration damper (24d) of the plurality of anti-vibration dampers (24) is provided in a region on the left side of the dividing line when the rotation direction of the rotary drum (21) during the dewatering operation is left-handed, and is provided in a region on the right side of the dividing line when the rotation direction of the rotary drum (21) during the dewatering operation is right-handed, and is provided in a region on the left side of the dividing line when the rotation direction of the rotary drum (21) during the dewatering operation is right-handed. One anti-vibration damper (24d) and an outer groove side mounting part (11d) of the outer groove (11) are arranged on the side close to the clothes input opening part when viewed in the axial direction of the outer groove, and the other anti-vibration damper (24d) and a box side mounting part (1d) of the box are arranged farther away from the clothes input opening part (11op) than the outer groove side mounting part (11d) when viewed in the axial direction of the outer groove (11).

Description

Technical Field

[0001] The present invention relates to a washing machine for washing clothes, and in particular to a drum-type washing machine with a washing tank arranged in a horizontal direction. Background Art

[0002] Generally speaking, a drum washing machine is composed of an outer tank for storing water, a rotating drum as a washing tank which is built into the outer tank and can rotate, and a housing in which the outer tank and the rotating drum are built. The outer tank is supported by the housing by vibration-proof structures such as vibration-proof dampers and suspension springs. When the clothes are dehydrated, the rotating drum is rotated at a high speed to dehydrate by centrifugal force. Therefore, when the distribution of the clothes in the rotating drum is biased, the outer tank vibrates.

[0003] Therefore, the vibration of the outer tank is suppressed by the vibration damper and the suspension spring. As examples of the vibration damper for suppressing the vibration of the outer tank, for example, the vibration dampers described in Japanese Patent Application Laid-Open No. 2015-53947 (Patent Document 1) and Japanese Patent Application Laid-Open No. 5-84389 (Patent Document 2) are known.

[0004] In the drum-type washing machine of Patent Document 1, a first vibration-isolating damper is provided on the drum rotation direction side and arranged at a front side relative to the center of gravity of the tank unit, and a second vibration-isolating damper is arranged at a rear side relative to the center of gravity of the tank unit, and a case connecting portion connecting the first vibration-isolating damper and the second vibration-isolating damper is attached to the washing machine case via a third buffer material A and a third buffer material B. Furthermore, the first vibration-isolating damper and the second vibration-isolating damper, as well as the third buffer material A and the third buffer material B, can also attenuate the vibration of the tank unit in the front-back and left-right directions.

[0005] The drum-type washing machine of Patent Document 2 includes a water tank supported by suspension and a drum rotating in the water tank, and a pair of vibration dampers are provided between the lower part of the water tank and the washing machine body, and the pair of vibration dampers are installed obliquely in the front-back direction and arranged with an angle θ therebetween. Moreover, the pair of vibration dampers can generate a damping force in the front-back direction and suppress the vibration of the water tank.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2015-53947

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 5-84389 Summary of the invention

[0010] Problems to be solved by the invention

[0011] As is well known, during the dehydration operation of a drum washing machine, the rotational speed of the rotating drum is increased step by step and high-speed rotation is performed for centrifugal dehydration. Therefore, vibration often occurs in the outer tub due to the offset of the laundry during dehydration or the like. Moreover, in the case where the outer tub vibrates excessively, there is a concern about abnormal vibration caused by the contact between the outer tub and the cabinet, and in the worst case, damage to the drum washing machine. Particularly in a drum washing machine with a relatively long depth of the drum, even if the offset amount of the laundry is small, since the moment arm becomes large, the vibration in the front-rear direction caused by the rocking motion of the outer tub also becomes a problem.

[0012] By improving the damping performance of the vibration isolation mechanism (so-called anti-vibration damper) that connects the outer tub and the cabinet, it is possible to suppress the vibration of the outer tub within the rotational speed range where the outer tub resonates. On the other hand, in a vibration isolation mechanism with high damping performance, during high-speed rotation, the vibration of the outer tub is transmitted to the cabinet, and the cabinet and the installation floor of the drum washing machine vibrate. The vibration of the cabinet and the vibration of the installation floor cause discomfort to the user. Therefore, there is a need to balance the suppression of the vibration of the outer tub and the suppression of the vibration of the cabinet and the installation floor.

[0013] In Patent Document 1, by providing a plurality of anti-vibration dampers at the lower part of the outer tub and providing a cushioning material at the connecting part between the anti-vibration damper and the cabinet, the vibration of the outer tub in the left-right direction, up-down direction, and front-rear direction when viewed from the front of the washing machine is suppressed.

[0014] The anti-vibration damper is installed in a posture that imparts damping to the vibration of the outer tub in the left-right direction and up-down direction, and mainly suppresses the vibration in the front-rear direction through the damping of the cushioning material. Therefore, a cushioning material with high damping performance is required, and there is a concern that the vibration transmitted to the cabinet and the installation floor during high-speed rotation will increase.

[0015] Moreover, in Patent Document 2, a plurality of anti-vibration dampers are installed at the lower part of the outer tub so as to be inclined in the front-rear direction, and the vibration of the outer tub is suppressed by the damping of the vibration in the front-rear direction. However, since the vibration mode in the front-rear direction during the resonance of the outer tub is not considered, even if the vibration in the front-rear direction caused by the rocking motion of the outer tub is generated significantly, the anti-vibration damper cannot perform a large stroke. On the contrary, there is a concern that the vibration cannot be sufficiently attenuated in an anti-vibration damper with a small damping performance. Therefore, in order to suppress the vibration in the front-rear direction, it is necessary to use an anti-vibration damper with high damping performance, and thus, as in Patent Document 1, there is a concern that the vibration transmitted to the cabinet and the installation floor during high-speed rotation will increase.

[0016] An object of the present invention is to provide a drum washing machine that can suppress the vibration of the outer tub in the front-rear direction and suppress the increase in the vibration transmitted to the cabinet and the installation floor.

[0017] Solution for Solving the Problem

[0018] The present invention relates to a drum washing machine, comprising a cabinet, an outer tub supported within the cabinet and capable of storing washing water therein, a rotary drum disposed within the outer tub and rotated by an electric motor, and a plurality of anti-vibration dampers connecting the lower portion of the outer tub to the bottom of the cabinet. The present invention is characterized in that

[0019] when observing the laundry loading opening of the outer tub from the front in a plan view, when a dividing line in the direction of gravity passing through the center of the laundry loading opening is hypothetically set,

[0020] at least one of the plurality of anti-vibration dampers is configured to be disposed in a region on the left side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is counterclockwise, and to be disposed in a region on the right side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is clockwise.

[0021] Furthermore, the outer tub side mounting portion between one anti-vibration damper and the outer tub is disposed on the side closer to the laundry loading opening when observing in the axial direction of the outer tub, and the cabinet side mounting portion between one anti-vibration damper and the cabinet is disposed farther from the laundry loading opening than the outer tub side mounting portion when observing in the axial direction of the outer tub.

[0022] The effects of the invention are as follows.

[0023] Vibration in the front-rear direction of the outer tub can be suppressed, and an increase in vibration transmitted to the cabinet and the installation floor can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a drum washing machine to which the present invention is applied.

[0025] Figure 2 is a cross-sectional view showing a longitudinal section explaining the internal structure of the drum washing machine.

[0026] Figure 3 is a flowchart showing a control mode of the rotational speed of the rotary drum during the dehydration process.

[0027] Figure 4 is an explanatory diagram explaining changes in vibration phases in respective vibration directions of the outer tub.

[0028] Figure 5 is an explanatory diagram explaining a vibration locus observed from one side of the laundry loading opening of the outer tub.

[0029] Figure 6 is an explanatory diagram explaining the nodding motion of the outer tub.

[0030] Figure 7AIt is a structural diagram observed from the front of the outer tank, showing the configuration relationship between the outer tank and the box body that are embodiments of the present invention, as well as the anti-vibration and shock-absorbing device.

[0031] Figure 7B It is a structural diagram observed from the side of the outer tank, showing the configuration relationship between the outer tank and the box body that are embodiments of the present invention, as well as the anti-vibration and shock-absorbing device.

[0032] Figure 8A It is an explanatory diagram for explaining the first movement of the anti-vibration and shock-absorbing device in this embodiment.

[0033] Figure 8B It is an explanatory diagram for explaining the second movement of the anti-vibration and shock-absorbing device in this embodiment. Detailed Embodiment

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and various modification examples and application examples are also included within the scope of the technical concept of the present invention.

[0035] Figure 1 It is a perspective view of a drum washing machine 100 to which the present invention is applied. Figure 2 It is a side view showing the internal structure of the drum washing machine 100. Hereinafter, Figure 1 and Figure 2 will be used to describe the general structure and operation of the drum washing machine 100.

[0036] Constitute Figure 1 The box body 1 forming the outer contour of the drum washing machine 100 shown is installed on the box body base 1a and is composed of left and right side plates 1b ( Figure 1 only the right side plate is shown in Figure 2 ), a front cover 1c, a rear cover 1d (refer to Figure 2 ), an upper cover 1e, and a lower front cover 1f.

[0037] A water supply hose connection port 30 for supplying water from a faucet to the drum washing machine 100 is provided on the upper cover 1e. The box body 1 forms a box-shaped outer frame including the base 1a and has sufficient strength as the outer frame.

[0038] The door 2 is used to block a laundry inlet (not shown) for taking in and out laundry provided substantially at the center of the front cover 1c and is supported by a hinge (not shown) provided on the front cover 1c so as to be openable and closable. For the door 2, it is opened by pulling the door handle 2a forward to release the locking mechanism (not shown), and on the other hand, it is locked and closed by pushing the door 2 against the front cover 1c. The front cover 1c has a circular laundry inlet that is substantially concentric with the laundry inlet opening of the outer tank 11 described below and is used for taking in and out laundry.

[0039] The operation / display panel 3 provided at the upper part of the cabinet 1 has a power switch 4, an operation switch 5, and a display 6. The operation / display panel 3 is electrically connected to the control unit 7 (refer to Figure 2 ) provided in the upper reinforcement member 13 (refer to Figure 2 ) provided at the upper part of the cabinet 1. A cooling fan (not shown) is installed in the control unit 7. Also, the control unit 7 has a memory capable of recording the operation of the drum washing machine. A drain hose 14 for draining water is installed near the cabinet base 1a.

[0040] In Figure 2 the interior of the cabinet 1 of the drum washing machine 100 shown, there is an outer tub 11 for accumulating water. To maintain the posture of the outer tub 11, the upper part of the outer tub 11 is connected by two sets of suspension mechanisms 8 composed of spiral springs. The lower part of the outer tub 11 is connected by a plurality of anti-vibration dampers 24a to 24d installed on the cabinet 1. The connecting parts of both ends of the anti-vibration dampers 24a to 24d with the outer tub 11 and the cabinet 1 are installed in a state capable of swinging with respect to the vibration direction of the outer tub 11.

[0041] The number of the anti-vibration dampers 24 may be two or more, and its structure is not limited. In the present embodiment, it is set to four as described above. In addition, in the present embodiment, especially when one side of the door 2 is set as the front, the arrangement mode of the anti-vibration damper 24d provided at a position closer to the door 2 side of the outer tub 11 has a feature. This will be described using Figure 7A , Figure 7B .

[0042] Inside the outer tub 11, a rotary drum 21 for washing clothes is installed. Behind the outer tub 11, there is an electric motor 22 for rotating the rotary drum 21. The shaft 22a of the electric motor 22 that becomes the rotating shaft penetrates the outer tub 11 and is mechanically coupled to the rotary drum 21. When the electric motor 22 rotates and drives, the rotary drum 21 is rotationally driven in two directions, forward rotation (left rotation when observing the door 2 of the drum washing machine 100 from the front) and reverse rotation (right rotation when observing the door of the drum washing machine 100 from the front).

[0043] Figure 2 The rotation axis Az of the rotary drum 21 shown is horizontal from the front of the door 2 side of the drum washing machine 100 toward the rear, or is inclined so that the inner side becomes the lower side ( Figure 2 in, inclined so that the inner side becomes the lower side). A rotation speed detection device 10 for detecting the rotation speed is provided on the electric motor 21.

[0044] A plurality of dehydration holes 21b for discharging the washing water in the rotary drum 21 to the outer tub 11 are provided on the inner circumferential surface of the rotary drum 21, and a plurality of baffles 23 (only one is shown in Figure 2 the figure) are provided at intervals in the circumferential direction of the rotary drum 21 and are used to lift the clothes put into the rotary drum 21. The baffle 23 extends in the front-rear direction of the rotary drum 21.

[0045] A cylindrical fluid balancer 21c is provided at the front end (the side of the door 2) of the rotary drum 21. The outer tub 11 is formed into a bottomed substantially cylindrical shape with the front as an opening and the rear blocked. The clothing input opening of the outer tub 11 and the clothing input opening of the cabinet 1 are connected by a bellows 16 that can easily expand and contract in the front-rear direction. The bellows 16 is an annular seal, and the rotary drum 21 is water-sealed by closing the door 2.

[0046] Moreover, the clothing input openings of the cabinet 1, the outer tub 11, and the rotary drum 21 communicate with each other, and by opening the door 2, clothes can be taken out and put into the rotary drum 21. In addition, the outer tub 11 can also be divided into a side including the clothing input opening and a side where the electric motor 22 is installed.

[0047] A drain port 19 provided at the lower part of the outer tub 11 is connected to an internal drain hose 14. A circulation pump 20 for circulating the washing water is provided in the lint trap box 17, and the washing water is dispersed into the rotary drum 21 via a circulation path 20a. A drain valve 15a is provided on the external drain hose 15. By closing the drain valve 15a, water is supplied and accumulated in the outer tub 11, and by opening the drain valve 15a, the water in the outer tub 11 is discharged to the outside of the machine.

[0048] Furthermore, an outer tub vibration detection unit 18 for detecting the vibration of the outer tub 11 is provided at the lower part of the outer tub 11. When the vibration of the outer tub 11 exceeds a preset threshold value, the rotation of the rotary drum 21 is temporarily stopped, the bias of the clothes is corrected, and the dehydration process is restarted. Only when the vibration is below the threshold value, the rotation speed of the rotary drum 21 is increased to suppress the generation of excessive vibration.

[0049] Next, the operation of the drum washing machine 100 with the above structure will be described. In the drum washing machine 100 configured like this, first, the user presses the power switch 4, and thus the drum washing machine 100 starts.

[0050] Then, the user pulls the door handle 2a to open the door 2 and puts clothes into the rotary drum 21. Moreover, after the user closes the door 2, the operation is started by operating the operation switch 5.

[0051] When the operation starts, the rotary drum 21 rotates to calculate the clothing capacity before water injection. The clothing capacity is calculated based on the rotational speed and current value of the electric motor 22. At this time, the larger the clothing capacity, the greater the load applied to the electric motor 22, so the current value becomes larger, and the clothing capacity is determined by the current value. Then, based on the clothing capacity, the amount of detergent to be put in is displayed on the display 6. At this time, the more the calculated clothing capacity, the more the amount of detergent to be put in. The user confirms the display on the display 6, puts a predetermined amount of detergent into the detergent container 12, and starts the washing process.

[0052] In the washing process, the water supply valve 32 is opened, and the water and detergent supplied from the water supply hose connection port 30 are supplied together to the outer tub 11 via the internal water supply hose 31 and the detergent container 12. At this time, the more the calculated clothing capacity, the more the water supply amount in the washing process. Further, the undissolved detergent and water are stirred in the circulation pump 20. Thereby, the detergent is efficiently dissolved to generate a high-concentration detergent solution. After performing this operation for a predetermined time, a washing operation of repeatedly rotating the rotary drum 21 forward, stopping, reversing, and stopping is performed at a predetermined time. At this time, the clothes are washed by repeatedly performing the actions of the clothes being lifted and dropped by the baffle 23.

[0053] After the washing process is performed, a dehydration process is carried out. Refer to Figure 3 The dehydration process is carried out. Figure 3 The control mode of the rotational speed of the rotary drum 21 in the dehydration process is shown. First, by opening the drain valve 15a after the washing process ends, the water in the outer tub 11 is discharged to the outside (outside the machine) of the drum washing machine 100 via the drain hose 14. In the dehydration process, the rotational speed of the rotary drum 21 is passed through the low-speed rotational speed region (t1~t2) where the clothes are unfolded and attached to the inner peripheral surface of the rotary drum 21, the resonance section (t2~t3) of the outer tub 11, the resonance section (t3~t4) of the cabinet 1, the post-resonance section (t4~t5) of the cabinet 1, and is raised to the target rotational speed region (t5~t6) to perform centrifugal dehydration on the moisture contained in the clothes.

[0054] In the low-speed rotation region, the rotational speed of the rotary drum 21 is raised to ω 0 (for example, 50 r / min). At this time, the clothes containing moisture in the washing process are lifted by the baffle 23 when the rotary drum 21 rotates, and the clothes are unfolded on the inner peripheral surface of the rotary drum 21 when they fall. If after the rotational speed of the rotary drum 21 reaches ω 0 After that, in order to detect the offset of the clothes at ω 0 , the rotary drum 21 is rotated at ω 0 for a time T1 (for example, 10 seconds).

[0055] The offset detection of the laundry in the low-speed rotation area is determined by the magnitude of the rotational variation. In addition, for example, when the rotary drum 21 rotates one full turn, the rotational variation is obtained based on the difference between the speed (the lowest speed) at which the laundry is lifted from below to above the rotary drum 21 and the speed (the highest speed) at which the laundry descends from above to below the rotary drum 21. It can be confirmed that the smaller the rotational variation, the less the offset of the laundry. In ω 0 In the offset detection of the laundry, when it is determined that the rotational variation is below a preset threshold value, the rotational speed of the rotary drum 21 is increased from ω 0 to ω 1 (for example, 80 r / min).

[0056] After the rotational speed of the rotary drum 21 reaches ω 1 , for the offset detection of the laundry, it operates at ω 1 for a time T2 (for example, 5 seconds). In addition, ω 0 and ω 1 become the rotational speeds for detecting the degree of attachment of the laundry, ω 0 is the rotational speed at which the laundry starts to attach to the inner peripheral surface of the rotary drum 21, and ω 1 is the rotational speed at which the laundry completely attaches to the inner peripheral surface of the rotary drum 21.

[0057] After operating at ω 1 for a predetermined time, in the offset detection of the laundry at ω 1 , when it is determined that the rotational variation is below a preset threshold value, the rotational speed of the rotary drum 21 is increased to ω 2 (for example, 400 r / min) to pass through the resonance range of the outer tub 11. When passing through the resonance range of the outer tub 11, when the vibration amplitude of the outer tub 11 is smaller than a predetermined value, the rotational speed of the rotary drum 21 is increased to ω 3 (for example, 600 r / min) to pass through the resonance range of the cabinet 1.

[0058] When passing through the resonance range of the cabinet 1, when the vibration amplitude of the outer tub 11 is smaller than a predetermined value, the rotational speed of the rotary drum 21 is increased to the target (for example, 900 r / min). In the target rotational speed range, after operating the rotary drum 21 at a predetermined time T3 (for example, 180 seconds), the rotational speed of the rotary drum 21 is decreased (t6 - t7) to 0 r / min to end the dehydration process.

[0059] In the dehydration process, when the offset of the laundry attached to the inner peripheral surface of the rotary drum 21 is large, the rotational variation of the rotary drum 21 and the vibration amplitude of the outer tub 11 are larger than the threshold value. Therefore, the rotational speed of the rotary drum 21 is decreased or the rotation of the rotary drum 21 is stopped, and the loosening actions of repeatedly rotating the rotary drum 21 forward and backward and water injection are performed to execute the action of correcting the offset of the laundry.

[0060] Next, after the dehydration process, a rinsing process is performed. In this rinsing process, the water supply valve 32 is opened, and tap water supplied from the water supply hose connection port 30 is supplied into the outer tub 11 via the water supply hose 31 and the detergent container 12. And, similar to the washing process, the more the calculated laundry capacity, the more the water supply amount. In this rinsing process, similar to the washing process, the forward rotation, stop, reverse rotation, and stop actions of the drum 21 are repeated. At this time, the stirring action of the laundry dropped by the baffle 23 is performed for a predetermined time.

[0061] After that, the above dehydration process and rinsing process are repeated a predetermined number of times, and it is moved to the final dehydration process. The operating time of the target rotation speed range in this final dehydration process is set to be longer than that of the dehydration process (for example, 300 seconds).

[0062] In this way, in the dehydration process, according to the rotation speed and the offset of the laundry, there are multiple resonance regions, and the vibration of the drum washing machine 100 changes. Figure 4 Shows the rotation speed of the rotary drum 21 in the resonance range of the outer tub (for example, 100 r / min to 400 r / min) and the transition of the vibration phase in each direction (vertical direction, horizontal direction, front-back direction).

[0063] Here, (1) the vibration in the vertical direction means the vibration in the gravitational direction when looking down with the door 2 as the front in the state where the drum washing machine is installed on the installation floor of the house, (2) the vibration in the horizontal direction means the vibration in the direction orthogonal to the gravitational direction when looking down with the door 2 as the front, and (3) the front-back direction means the direction in which the rotation axis Az of the rotary drum 21 (refer to Figure 2 ) extends, and also means the vibration in the direction around the center of gravity. And, the reference of the vibration phase is set to "0°" when the offset of the laundry exists at the rightmost side of the outer tub 11 ( Figure 5 the right part intersecting the X-X division line of ).

[0064] Figure 4 In, according to the increase in the rotation speed of the rotary drum 21, the vibration phase in each direction shifts, and the vibration mode of the outer tub 11 changes. The vibration phase shift in the front-back direction is that it moves from the initial phase of 0° to about 90° at the resonance of the outer tub 11 (displayed at the resonance rotation speed Nrm), and then moves from the initial phase of 0° to 180° as the rotation speed of the rotary drum 21 increases. In addition, due to spring components such as the suspension mechanism 8 for supporting the posture of the outer tub 11, the resonance rotation speed of the vibration phase in the vertical direction is higher than that in the horizontal direction. Furthermore, when the rotation speed of the rotary drum 21 rises, resonance in the front-back direction caused by the shaking motion of the outer tub 11 occurs.

[0065] Figure 5 FIG. 2 shows the vibration trajectory when the outer tank 11 is viewed from the front (clothing input opening side) when a resonance mode of vibration in the front-back direction is generated. Similarly, Figure 6 The vibration trajectory when the outer groove 11 is obliquely viewed is shown. Here, Figure 5 In the figure, for convenience of explanation, the clothing input opening 11op is virtualy divided into four regions, namely, "upper right region", "lower right region", "upper left region" and "lower left region", by a YY dividing line in the up-down direction (gravity direction) passing through the center C of the clothing input opening 11op and a XX dividing line in the left-right direction orthogonal to the YY dividing line and passing through the center C. In addition, the clothing input opening 11op is shown without displaying related components such as the bellows 16.

[0066] The rotation speed Nrm (refer to Figure 4 ), the phase difference between the vibration phase in the left-right direction and the vibration phase in the up-down direction of the outer groove 11 is much smaller than 90°, for example, Figure 4 Therefore, when the rotary drum 21 is rotating in the forward direction (counterclockwise) for dehydration, when viewed from the front of the clothing input opening 11op of the outer tank 11, the outer tank 11 vibrates in an elliptical vibration trajectory that is inclined to the upper right, from the lower left area to the upper right area.

[0067] Thus, it is found that the upper right region and the lower left region of the outer groove 11 are oscillating greatly.

[0068] In the resonance mode of the vibration in the front-rear direction of the outer tank 11, as Figure 6 As shown, the upper right portion of the upper right area and the lower left portion of the lower left area of ​​the front end side (the side where the clothing insertion opening 11op is formed) of the outer tub 11 vibrate greatly back and forth. On the other hand, when the rotary drum 21 performs a dehydration operation in the reverse direction (right rotation), the upper left portion of the upper left area and the lower right portion of the lower right area of ​​the front end side of the outer tub 11 vibrate greatly.

[0069] That is, in the resonance mode of the vibration in the front-rear direction of the outer tub 11, when the rotation direction of the rotary drum 21 is forward, the upper right part and the lower left part vibrate greatly back and forth, and when the rotation direction of the rotary drum 21 is reverse, the upper left part and the lower right part vibrate greatly back and forth. Due to this shaking motion, the vibration transmitted to the cabinet and the installation floor of the drum-type washing machine increases.

[0070] Therefore, in the present embodiment, a configuration structure of a vibration isolator for suppressing the shaking vibration is proposed. In addition, a friction vibration isolator is used as the vibration isolator, but an oil vibration isolator filled with oil may also be used, and various vibration isolators can be used as needed.

[0071] Figure 7A , Figure 7B The configuration structure of vibration isolators 24 (four are used) for suppressing vibrations in the vertical and horizontal directions including the shaking vibration of the outer tub 11 is shown. Here, Figure 7A The structure of the outer tub 11 as observed from one side of the laundry loading opening 11op on the front side is shown. Figure 7B The structure of the outer tub 11 as observed from the side is shown. And, Figure 7A In, Figure 5 The same as, represents the Y - Y division line in the vertical direction and the X - X division line in the horizontal direction orthogonal to the Y - Y division line. In addition, hereinafter, the case where the rotary drum 21 rotates in the forward rotation direction will be described.

[0072] Figure 7A , Figure 7B In, in the lower right part of the lower right region of the outer tub 11, two vibration isolators 24a and 24b are provided in the front - rear direction of the outer tub 11 along the axis of the outer tub 11 (corresponding to the rotation axis Az). The outer tub 11 can be divided into a front - side region and a rear - side region with the center line Cc of the outer tub 11 shown in Figure 7B as a boundary. Moreover, the right front - side vibration isolator 24a is installed in the front - side region of the outer tub 11, and similarly, the right rear - side vibration isolator 24b is installed in the rear - side region of the outer tub 11.

[0073] The vibration isolators 24a and 24b are installed in the same installation manner at the mounting portions (outer - tub - side mounting portions) 11a and 11b of the vibration isolators 24a and 24b with the outer tub 11 and the mounting portions (cabinet - side mounting portions) 1a and 1b of the vibration isolators 24a and 24b with the cabinet 1. That is, the vibration isolators 24a and 24b are mainly installed in a state where they can swing in response to vibrations in the horizontal and vertical directions.

[0074] Specifically, the mounting portions 11a and 11b of the outer tub 11 and the mounting portions 1a and 1b of the cabinet 1 have a pair of flanges that sandwich the two ends of the vibration isolators 24a and 24b and extend in a direction orthogonal to the axis of the outer tub 11. The two ends of the vibration isolators 24a and 24b are sandwiched between the pair of flanges, and bolts are inserted and fixed.

[0075] Thus, the vibration dampers 24a and 24b can swing around the bolt with respect to vibrations in a plane orthogonal to the axis of the outer groove 11. In addition, the installation angle of the right front vibration damper 24a with respect to the horizontal is "θa", and the installation angle of the right rear vibration damper 24b is "θb", and the relationship of "θa < θb" is set. The above installation angles are appropriately selected mainly according to the acting directions and magnitudes of vibrations in the left-right direction and the up-down direction.

[0076] Similarly, Figure 7A , Figure 7B in the lower left part of the lower left region of the outer groove 11, two vibration dampers 24c and 24d are provided in the front-rear direction along the axis of the outer groove 11 (corresponding to the rotation axis Az). Moreover, as Figure 7B shown, in the axial direction, with the center line Cc of the outer groove 11 as the boundary, the left rear vibration damper 24c is installed in the rear region of the outer groove 11, and the left front vibration damper 24d is installed in the front region of the outer groove 11.

[0077] The left rear vibration damper 24c is installed in the same installation manner as the installation parts (outer groove side installation parts) 11c of the outer groove 11 and the installation parts (box body side installation parts) 1c of the left rear vibration damper 24c and the box body 1 described above. That is to say, the left rear vibration damper 24c is mainly installed in a state capable of swinging with respect to vibrations in the left-right direction and the up-down direction.

[0078] Specifically, the installation part 11c of the outer groove 11 and the installation part 1c of the box body 1 are provided with a pair of flanges that sandwich both ends of the vibration damper 24c and extend in a direction orthogonal to the axis of the outer groove 11. Both ends of the left rear vibration damper 24c are sandwiched between the pair of flanges, and bolts are inserted and fixed.

[0079] Thus, the vibration damper 24c can swing around the bolt with respect to vibrations in a plane orthogonal to the axis of the outer groove 11. In addition, the installation angle of the left rear vibration damper 24c is "θc", and the relationship of "θa < θb < θc" is set. The above angles are appropriately selected mainly according to the acting directions and magnitudes of vibrations in the left-right direction and the up-down direction.

[0080] Next, the left front anti-vibration shock absorber 24d is installed in a state where it is rotated 90° in the installation direction relative to the left rear anti-vibration shock absorber 24c. That is, the left front anti-vibration shock absorber 24d and the mounting portion (outer groove side mounting portion) 11d of the outer groove 11 and the mounting portion (casing side mounting portion) 1d of the left front anti-vibration shock absorber 24d and the casing 1 are installed in a state rotated 90° relative to the mounting portions 11a - 11c on the side of the outer groove 11 and the mounting portions 1a - 1c on the side of the casing 1 of the anti-vibration shock absorbers 24a - 24c described above. In other words, the left front anti-vibration shock absorber 24d is mainly installed in a state where it can swing in response to nodding vibrations in the front-rear direction.

[0081] Specifically, the mounting portion 11d of the outer groove 11 and the mounting portion 1d of the casing 1 are provided with a pair of flanges that sandwich both ends of the anti-vibration shock absorber 24d and extend in the direction of the axis of the outer groove 11. Both ends of the anti-vibration shock absorber 24d are sandwiched between the pair of flanges, and bolts are inserted and fixed. Thus, the left front anti-vibration shock absorber 24d can swing around the bolts in a plane along the axis of the outer groove 11 in response to nodding vibrations.

[0082] Here, the arrangement positions of the mounting portion 11d on one side of the outer groove 11 and the mounting portion 1d on one side of the casing 1 are as follows. As Figure 7B shown, the mounting portion 11d of the outer groove 11 is arranged on the side closer to the laundry input opening 11op in the front side region of the outer groove 11, and the mounting portion 1d of the casing 1 is arranged farther from the laundry input opening 11op of the outer groove 11 than the mounting portion 11d. At this time, the installation angle of the left front anti-vibration shock absorber 24d is "θd", and this angle is appropriately selected according to the acting direction and magnitude of the vibration in the front-rear direction.

[0083] As Figure 5 、 Figure 6 described, in the resonance mode of the vibration in the front-rear direction of the outer groove 11, the upper right part and the lower left part of the outer groove 11 perform large-amplitude nodding vibrations. Therefore, for the left front anti-vibration shock absorber 24d inclined in the front-rear direction along the axis of the outer groove 11, arranging it in the lower left can impart sufficient damping force to the nodding motion of the outer groove 11 and suppress the vibration in the front-rear direction more effectively than arranging it in the lower right of the outer groove 11.

[0084] Next, the influence of the configuration structure of the anti-vibration shock absorbers 24a - 24d shown in Figure 7A 、 Figure 7B on the vibration transmission to the installation floor will be described. In addition, the damping attenuation performance of the anti-vibration shock absorbers 24a - 24d has the same attenuation performance at any installation position.

[0085] As Figure 3As shown, since there is a resonance range of the casing 1 at a rotational speed higher than the resonance range of the outer tub 11 (for example, 450 r / min), the transmission force toward the installation floor increases. Thereafter, as the rotational speed increases, the transmission force toward the installation floor decreases and the vibration converges. In the high-speed rotational speed region, regardless of the configuration structure of the vibration isolators 24a to 24d, the vibration of the outer tub 11 tends to converge to a certain value. Therefore, the vibration transmitted from the outer tub 11 to the installation floor depends on the damping performance of the vibration isolators 24a to 24d and converges to the same value regardless of the configuration structure of the vibration isolators 24a to 24d.

[0086] Therefore, by using the configuration structure of the vibration isolators 24a to 24d described in the present embodiment, it is possible to effectively suppress the vibration of the outer tub 11 in the vertical direction, the left-right direction, and the front-back direction, and it is also possible to effectively suppress the vibration transmitted to the installation floor.

[0087] Next, the configuration of the left front vibration isolator 24d that is inclined in the front-back direction along the axis of the outer tub 11 will be described. In the present embodiment, since the electric motor 22 is mounted behind the outer tub 11, the case where the center of gravity position 11g is behind the center line Cc of the outer tub 11 will be described. In addition, generally, the electric motor 22 is arranged as Figure 2 shown on the opposite side of the laundry loading opening 11op of the outer tub 11.

[0088] Since the swaying vibration of the outer tub 11 vibrates greatly at a position far from the center of gravity position 11g (the laundry loading opening side), the swaying vibration is generated more greatly in the front than in the rear of the outer tub 11. Further, when the bias of the laundry is located in front of the rotary drum 21 (the laundry loading opening side), compared with the case where it is located in the rear (the electric motor side), under the same conditions, the moment arm with respect to the rotation center of the swaying vibration becomes larger and the swaying vibration also becomes larger. Therefore, the mounting portion 11d between the outer tub 11 is preferably mounted on the front side (the laundry loading opening side).

[0089] Figure 8A 、 Figure 8B shows the relationship between the configuration positions of the outer tub 11 and the left front vibration isolator 24d. The case where the mounting portion 11d is close to the laundry loading opening 11op with respect to the center of gravity position 11g of the outer tub 11 and the case where the mounting portion 11d is close to the center of gravity position 11g of the outer tub 11 will be described.

[0090] As Figure 8A shown, when the mounting portion 11d is provided close to the laundry loading opening 11op, according to the magnitude of the swaying vibration of the outer tub 11, the stroke dx of the left front vibration isolator 24d becomes larger and the damping performance is exerted, so that the swaying vibration of the outer tub 11 can be effectively suppressed.

[0091] On the other hand, as Figure 8B shown, when the mounting portion 11d is provided at a position close to the center of gravity 11g, compared with Figure 8A , the stroke dx becomes smaller. In addition, the left front side vibration damper 24d rotates around the mounting portion 1d of the cabinet 1, and it is difficult to impart a damping force to the swaying motion of the outer tub 11. Therefore, compared with the configuration position of Figure 8A , the damping performance cannot be sufficiently imparted. Of course, Figure 8B can also suppress the swaying motion, which is just a relative comparison.

[0092] In this way, if the mounting portion 11d of the left front side vibration damper 24d is provided as close as possible to the laundry loading opening 11op, the swaying vibration of the outer tub 11 can be more effectively suppressed. In the present embodiment, the mounting portion 11d of the left front side vibration damper 24d is arranged between the vicinity of the center of the front side region of the outer tub 11 and the laundry loading opening 11op of the outer tub 11, but most preferably, it is arranged at the laundry loading opening 11op.

[0093] Here, when the left front side vibration damper 24d is mounted in such a way that the mounting portion 11d of the outer tub 11 is at the rear side of the outer tub 11 and the mounting portion 1d of the cabinet 1 is at the front side of the outer tub 11, the left front side vibration damper 24d mainly generates rotation around the mounting connection portion 11d, and it is difficult to impart a damping force to the swaying motion. Therefore, as Figure 8A , Figure 8B shown, it is preferable to mount the left front side vibration damper 24d in such a way that the mounting portion 11d of the outer tub 11 is at the front side and the mounting portion 1d of the cabinet 1 is at the rear side.

[0094] Moreover, when a structure in which a heavy object is mounted on the outer tub 11 is adopted, the center of gravity position 11g of the outer tub 11 sometimes exists on the front side of the center line Cc of the outer tub 11. In this case, Figure 7B the left front side vibration damper 24d shown is replaced with the left rear side vibration damper 24c, and the left rear side vibration damper 24c is replaced with the left front side vibration damper 24d. And, in this case, the inclination direction of the left front side vibration damper 24d becomes the opposite direction.

[0095] Next, the vibration dampers 24a to 24c mounted obliquely in the left-right direction as Figure 7A shown will be described.

[0096] In a plan view of the laundry input opening 11op of the outer tub 11 as viewed from the front, the anti-vibration dampers 24a to 24c are respectively installed in a posture inclined at angles θa to θc in the left-right direction (with the horizontal plane being 0°), so that vibrations caused by resonance in the left-right direction and the up-down direction can be mainly suppressed.

[0097] The anti-vibration damper 24c is equipped on the left side of the outer tub 11, and the anti-vibration dampers 24a and 24b are equipped on the right side, forming a structure that supports the outer tub 11. As described above, the lower left region vibrates more significantly than the lower right region of the outer tub 11. Therefore, it is preferable that the damping force of the anti-vibration damper 24 is stronger on the lower left side than on the lower right side.

[0098] As Figure 5 explained in, near the rotational speed of the resonance mode in the front-rear direction of the outer tub 11, nodding vibration occurs with an elliptical vibration locus inclined upward to the right. Therefore, the vibration in the up-down direction on the right side of the Y-Y dividing line of the outer tub 11 is larger than the vibration in the left-right direction. Therefore, when either of the posture angles θa and θb of the anti-vibration dampers 24a and 24b arranged on the right side of the Y-Y dividing line of the outer tub 11 is inclined to 45° or more, the vibration in the up-down direction can be further suppressed.

[0099] The arrangement of the anti-vibration damper 24 described above is an example and should not be limited thereto. For example, instead of having only one left front anti-vibration damper 24d inclined in the front-rear direction, multiple anti-vibration dampers 24d can be provided. Also, the left rear anti-vibration damper 24c is configured to be able to be installed so as to be inclined back and forth to increase the damping force of the vibration in the front-rear direction and further suppress the nodding vibration.

[0100] Here, in the above-described embodiment, an example of the forward rotation (left rotation) of the rotary drum 21 has been described. However, in the case where the drum 21 rotates in the reverse direction (right rotation), it is only necessary to reverse the left-right relationship of the arrangement of the anti-vibration dampers in this embodiment, and the left front anti-vibration damper 24d that suppresses the vibration in the front-rear direction can be arranged in the lower right region.

[0101] Furthermore, the present invention is not limited to the above several embodiments and includes various modification examples. The above-described embodiments are embodiments described in detail for easy understanding of the present invention and are not limited to having all the structures described. Also, a part of the structure of a certain embodiment can be replaced with the structure of another embodiment, and the structure of another embodiment can also be added to the structure of a certain embodiment. It is also possible to add, delete, or replace other structures to the structure of each embodiment.

[0102] Symbol Explanation

[0103] 1—Cabinet, 1a~1d—Mounting parts of the cabinet and the anti-vibration and shock-absorbing devices, 11—Outer groove, 11a~11d—Mounting parts of the outer groove and the anti-vibration and shock-absorbing devices, 11op—Clothing input opening of the outer groove, 21—Rotating drum, 24a~24d—Anti-vibration and shock-absorbing devices, 100—Front-loading washing machine.

Claims

1. A drum washing machine, comprising a cabinet, an outer tub supported within the cabinet and capable of accumulating washing water therein, a rotary drum disposed within the outer tub and rotated by an electric motor, and a plurality of anti-vibration dampers connecting the lower portion of the outer tub to the bottom of the cabinet. Characterized in that, When observing the top view of the laundry loading opening of the outer tub from the front in a state where the drum washing machine is installed on an installation floor, when a dividing line in the direction of gravity passing through the center of the laundry loading opening is hypothetically set, At least one of the plurality of anti-vibration dampers is configured to be disposed in a region on the left side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is counterclockwise, and to be disposed in a region on the right side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is clockwise. Furthermore, the one anti-vibration damper is arranged on the side closer to the laundry loading opening when observed in the axial direction of the outer tub with respect to the outer tub side mounting portion of the outer tub, and the one anti-vibration damper is arranged farther from the laundry loading opening than the outer tub side mounting portion when observed in the axial direction of the outer tub with respect to the cabinet side mounting portion of the cabinet.

2. The drum washing machine according to claim 1, Characterized in that, When observed in the axial direction of the outer tub, the cabinet side mounting portion is arranged closer to the center of gravity of the outer tub than the outer tub side mounting portion.

3. The drum washing machine according to claim 1 or 2, Characterized in that, Another anti-vibration damper different from the one anti-vibration damper is configured to be disposed in a region on the right side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is counterclockwise, and to be disposed in a region on the left side of the dividing line when the rotation direction during the dehydration operation of the rotary drum is clockwise. Furthermore, the another anti-vibration damper is disposed between the outer tub side mounting portion of the outer tub and the cabinet side mounting portion of the cabinet in a direction orthogonal to the axial direction of the outer tub, and its mounting angle is set to be 45° or more.

4. A drum washing machine, comprising a cabinet, an outer tub supported within the cabinet and capable of accumulating washing water therein, a rotary drum disposed within the outer tub and rotated by an electric motor, and four anti-vibration dampers connecting the lower portion of the outer tub to the bottom of the cabinet. Characterized in that, When observing the top view of the laundry loading opening of the outer tub from the front in a state where the drum washing machine is installed on an installation floor, when a dividing line in the direction of gravity passing through the center of the laundry loading opening is hypothetically set, The four anti-vibration dampers are configured such that a first anti-vibration damper and a second anti-vibration damper are arranged in the axial direction of the outer tub in a region on the right side of the dividing line, and a third anti-vibration damper and a fourth anti-vibration damper are arranged in the axial direction of the outer tub in a region on the left side of the dividing line, and the first anti-vibration damper and the fourth anti-vibration damper are arranged on the side closer to the laundry loading opening. When the rotation direction during the dehydration operation of the above-mentioned rotary drum is left-handed, the above-mentioned fourth anti-vibration damper and the outer tub side mounting portion of the above-mentioned outer tub are arranged on the side closer to the laundry input opening when viewed in the axial direction of the above-mentioned outer tub, and the above-mentioned fourth anti-vibration damper and the cabinet side mounting portion of the above-mentioned cabinet are arranged farther from the laundry input opening than the above-mentioned outer tub side mounting portion when viewed in the axial direction of the above-mentioned outer tub. The above-mentioned first anti-vibration damper, the above-mentioned second anti-vibration damper, and the above-mentioned third anti-vibration damper are arranged between the above-mentioned outer tub side mounting portion of the above-mentioned outer tub and the above-mentioned cabinet side mounting portion of the above-mentioned cabinet in a direction orthogonal to the axial direction of the above-mentioned outer tub. When the rotation direction during the dehydration operation of the above-mentioned rotary drum is right-handed, the above-mentioned first anti-vibration damper and the outer tub side mounting portion of the above-mentioned outer tub are arranged on the side closer to the laundry input opening when viewed in the axial direction of the above-mentioned outer tub, and the above-mentioned first anti-vibration damper and the cabinet side mounting portion of the above-mentioned cabinet are arranged farther from the laundry input opening than the above-mentioned outer tub side mounting portion when viewed in the axial direction of the above-mentioned outer tub. The above-mentioned second anti-vibration damper, the above-mentioned third anti-vibration damper, and the above-mentioned fourth anti-vibration damper are arranged between the above-mentioned outer tub side mounting portion of the above-mentioned outer tub and the above-mentioned cabinet side mounting portion of the above-mentioned cabinet in a direction orthogonal to the axial direction of the above-mentioned outer tub.

5. The drum washing machine according to claim 4, wherein, When the above-mentioned rotary drum rotates left, the mounting angles of the above-mentioned first anti-vibration damper, the above-mentioned second anti-vibration damper, and the above-mentioned third anti-vibration damper with respect to the direction orthogonal to the above-mentioned dividing line are different from each other.

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