JP2005211694A - Drum type washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum type washer which can contribute to reduction of vibration. <P>SOLUTION: A water tub 3 is retained by a suspension 61. A drum 10 is rotatably set inside the water tub 3 in a condition the rotation axis is rear-downward tilting against the horizon. A washer motor 17 is set on a drum shaft 14 in the back surface part of the water tub 3 to drive rotation of the drum 10. The center of gravity G of a load applied part 33 to be applied by a load against the suspension 61 is set so as to be positioned between the center of the drum 10 in front-rear direction and the rear end face of the drum 10. The suspension 61 is set on a point in the front-rear direction and simultaneously a position almost matching the center of gravity G of the load applied part 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drum-type washing machine configured to elastically hold a water tank by an elastic holding means.

  Conventionally, in a drum-type washing machine, as shown in FIG. 14, a water tub 102 is provided inside an outer box 101 and held by suspensions 103 as a plurality of elastic holding means. Inside the water tank 102, a drum 104 is disposed so as to be rotatable on the horizontal axis. A rotating shaft 105 of the drum 104 is supported by a housing 106 attached to the rear portion of the water tank 102 via a bearing 107, and a driven pulley 108 is attached to the rotating shaft 105.

  A motor 109 is provided at the outer lower portion of the water tank 102, and a drive pulley 110 is attached to the rotating shaft 109a. A belt 112 constituting a belt transmission mechanism 111 is stretched between the driving pulley 110 and the driven pulley 108. Counterweights 113 and 114 are attached to the upper and lower portions of the front part of the water tank 102 so as to balance the weight.

  In this configuration, the rotational driving force of the motor 109 is transmitted to the drum 104 via the belt transmission mechanism 111 and rotated, and washing and dehydration are performed based on the rotation. Yes. Note that the drum-type washing machine has a function of performing drying, and the drum 104 is rotated during drying.

However, this type of drum type washing machine has a problem that vibration is increased when the drum 104 is rotated.
Therefore, an object of the present invention is to provide a drum type washing machine that can contribute to reduction of vibration.

  When the present inventor conducted various investigations on the cause of vibration, the following was found. That is, there are various possible causes of vibration when the drum rotates, but the present inventor has paid attention to the position of the center of gravity of the heavy object held by the elastic holding means. As a result, when the position of the center of gravity was appropriately changed and the occurrence of vibration was observed, it was found that the vibration was reduced by changing the position of the center of gravity. When the center of gravity of the heavy object was positioned between the front-rear direction center of the drum and the rear end surface of the drum 4, the rotation balance was good and the vibration was low.

The present invention has been made paying attention to the above points.
The invention of claim 1 is a water tank held by a suspension in an outer box,
A drum in which the rotating shaft is rotatably provided in this water tank so as to be inclined downwardly with respect to the horizontal, and the laundry is accommodated therein;
A motor that is provided on the rotating shaft at the rear surface of the water tank and rotationally drives the drum;
Set the center of gravity of the load portion that is a load to the suspension so as to be located between the front-rear direction center of the drum and the rear end surface of the drum,
The suspension is characterized in that it is provided at one position in the front-rear direction and at a position that substantially coincides with the center of gravity of the load portion.

  In this configuration, the center of gravity of the load-loading portion exists between the front-rear direction center of the drum and the rear end surface of the drum, so that the rotation balance of the drum is good and generation of vibration can be effectively suppressed. become. In addition, since the suspension is provided at one position in the front-rear direction and substantially coincident with the center of gravity of the load-loading portion, the number of suspensions can be reduced, and the position of the suspension is the same as the center of gravity of the load-loading portion. Since they almost coincide, the rotation balance is also good. Further, since the drum is provided such that the rotation axis thereof is inclined downward with respect to the horizontal, the laundry in the drum is located on the rear side and is not displaced so much. The variation of the center of gravity of the load-loading portion included is reduced, and the rotation balance of the drum can be stabilized.

  The present invention can contribute to the reduction of vibration, the number of suspensions can be reduced, and the rotation balance of the drum can be improved.

  First, a first reference example for helping understanding of the present invention will be described with reference to FIGS. First, in FIG. 1, an outer box 1 of a drum-type washing machine has a rectangular box shape as a whole, and a circular laundry entrance 2a is formed on a front plate portion 2 thereof. Inside the outer box 1, a cylindrical water tank 3 having an axial direction directed in the front-rear direction is elastically supported from below by suspensions 4A and 4B (details will be described later) serving as elastic holding means. Is provided.

  The water tank 3 is configured to have, for example, a body portion 5, a rear plate portion 6, and a front plate portion 7 each formed of a metal plate, and the front plate portion 7 has a circular opening 7 a. Is formed. The opening 7a and the laundry entrance / exit 2a are connected to each other by a generally cylindrical connecting member 8 made of an elastic material having a cylindrical shape as a whole, for example, rubber. The laundry doorway 2a is opened and closed by a door 9.

  A drum 10 is rotatably provided in the water tank 3. The drum 10 is configured to be joined to, for example, a body portion 11, a rear surface member 12, and a front plate portion 13 each formed of a metal plate. A large number of holes 11 a are formed in the peripheral wall portion of the body portion 11, and a circular opening 13 a is formed in the front plate portion 13. The rear member 12 is configured by attaching a porous plate member 12b to a frame member 12a having a plurality of vent holes.

  Also, a drum shaft 14 is attached to the center portion of the rear member 12 of the drum 10 so as to protrude rearward, and this is a cast processing attached through the rear plate portion 6 of the water tank 3. A bearing housing 15 made of a product is rotatably supported via a bearing 16, and thus the drum 10 is rotatably provided.

  Further, the drum 10 is directly driven by a washing machine motor (corresponding to the motor of claim 1) 17 which is an outer rotor type brushless motor. That is, a rotor 18 provided with a permanent magnet is attached to the rear end portion of the drum shaft 14 so as to be able to rotate integrally, and the stator core and the coil are positioned on the bearing housing 15 so as to be located inside the rotor 18. A stator 19 is provided. Therefore, as can be seen from FIG. 1, the washing machine motor 17 is provided on the drum shaft 14 at the back of the water tub 3. When the rotor 18 is rotated, the drum 10 is directly rotated through the drum shaft 14.

  Further, a drain valve 20 that is opened and closed by a drain valve motor (not shown) and a flexible drain hose 21 are provided at the bottom of the water tank 3, and the water in the tank 3 passes through the drain hose 21 by opening the drain valve 20. It is designed to drain to the outside. In addition, a water supply valve for supplying water into the water tank 3 (not shown) is provided in the upper part of the outer box 1, and this is connected to the water tank 3 by a flexible hose (not shown). Furthermore, a heater portion 22 provided with a heater (not shown) for heating the water in the water tank 3 to generate hot water is provided at the inner bottom of the water tank 3.

  A hot air supply device 23 with a heat exchanger is provided from the rear part of the water tank 3 upward and forward, and this will be described. That is, a warm air return port 24 is formed in the rear plate portion 6 of the water tank 3. One end of a heat exchanger 25 that exchanges heat between the outside air and the hot air is connected to the warm air return port 24, and the other end of the heat exchanger 25 is connected to a fan via an accordion-shaped connecting duct 26. The blower casing 27a of the device 27 is connected to the suction side. On the discharge side of the fan device 27, the duct 28, the heating device 29, and one end of the duct 30 are connected in order. The other end of the duct 30 is connected to the hot air outlet 8 a formed in the connecting member 8 and communicates with the water tank 3.

  A blower blade (not shown) is provided inside the blower casing 27a, and the blower blade is driven by a drying fan motor (not shown). Is provided with a drying heater (not shown). Furthermore, moisture condensation water is supplied into the heat exchanger 25 and drained, and the water is supplied by a drying electromagnetic water supply valve (not shown). ing. The fan device 27, the duct 28, the heating device 29, and the duct 30 are attached to the inner upper surface of the outer box 1.

  In such a warm air supply device 23, during the drying operation, the drum 10 is rotated, and the drying fan motor is driven to rotate, and the drying heater generates heat. The fan is rotated by the drying fan motor, and the air in the drum 10 is sucked from the hot air return port 24 as indicated by an arrow A, and the heat exchanger 25, the connecting duct 26, the blower casing 27, the duct 28, and the heating device. 29, passes through the duct 30, and is returned to the water tank 3 from the hot air discharge port 8a. By this circulation, the air is warmed and heat exchanged (dehumidified).

Now, the counterweight 31 is attached to the upper part of the front part of the water tank 3, and the counterweight 32 is also attached to the lower part.
Here, the load applied to the suspensions 4A and 4B includes the water tank 3, the drum 10, the bearing portion (the drum shaft 14, which is a rotating shaft, the bearing housing 15 and the bearing 16 portion), the motor 17, the drain valve 20, and the heater. There are a portion 22, a heat exchanger 25 and the counterweights 31, 32. Thus, a load loading portion 33 is constituted by these. The center of gravity G of the load loading portion 33 is determined by the weight P and the mounting position of the counterweights 31 and 32, the center P in the front-rear direction of the drum 10, and the end surface 12T of the rear member 12 serving as the rear end surface of the drum 10. It is set to be located between. The front-rear direction center P of the drum 10 refers to a position that is approximately a half of the separation distance D from the inner surface of the front plate portion 13 of the drum 10 and the end surface 12T of the rear member 12.

  By the way, as the components having a large weight, there are the water tank 3, the drum 10, the bearing portion (the drum shaft 14, the bearing housing 15 and the bearing 16 portion) and the washing machine motor 17. Therefore, since at least the weight and the positional relationship are known at the time of design, it is possible to easily determine the center of gravity of the load load portion 33 before mounting the counterweight (this is referred to as the center of gravity before mounting the counterweight). The center of gravity before mounting the counterweight is in the vicinity of the rear surface of the water tub 3 because the washing machine motor 17 is in the direct drive type and thus is located in the rear surface of the water tub 3.

  Thus, the center of gravity G can be easily determined by determining the weight and mounting position of the counterweights 31 and 32 with respect to the center of gravity before mounting the counterweight.

  The suspensions 4A and 4B are all provided with the same components, and are configured as shown in FIG. That is, the lower end portion of the rod 35 is inserted into the cylinder 34 and the rod head 36 is connected to the lower end portion of the rod 35. A sliding contact ring 37 made of, for example, rubber is attached to the outer peripheral portion of the rod head 36 and is in sliding contact with the inner peripheral surface of the cylinder 34. Further, a compression coil spring 38 is provided between the bottom surface of the rod head 36 and the inner bottom portion of the cylinder 34.

  A holding collar 35a is fixed near the upper end of the rod 35, and the upper part thereof is the same as the fixture 39 constructed by attaching a metal plate 39b to the lower surface of a rubber cushion 39a. And an attachment 40 configured by attaching a metal plate 40b to the upper surface of the rubber cushion portion 40a. Furthermore, a screw portion 35 b is formed at the tip of the rod 35.

  A total of four suspensions 4A and 4B having such a configuration are provided. A pair of the suspension 4A and 4B on the front side with respect to the center of gravity G (a pair on the left and right, which is indicated by reference numeral 4A) and a pair on the rear side ( This is also provided as a pair on the left and right, and this is indicated by reference numeral 4B). The distance La between the front suspension 4A and the center of gravity G and the distance Lb between the rear suspension 4B and the center of gravity G are provided to be substantially equal. For mounting the suspensions 4A and 4B, the cylinder 34 is mounted and fixed in an upright state on the mounting base 1a on the inner bottom surface of the outer box 1 at the above-described position, and the upper mounting tool inserted through the upper end of the rod 35 is mounted. 39 and the fixture 40 are arranged so as to clamp the held base 3a fixed to the outside of the water tank 3, and are fastened and fixed by the nut 41. At this time, the load of the load load portion 33 is received by the spring 38 and is also received by the frictional force between the sliding contact ring 37 and the inner peripheral surface of the cylinder 34.

  In the reference example having the above configuration, during the washing operation, the drum 10 is intermittently rotated in the forward / reverse direction by the washing machine motor 17 being intermittently driven in the forward / reverse direction of the relatively low rotational speed. Further, during the dehydrating operation, the washing machine motor 17 is rotated at a high speed so that the drum 10 is rotated at a high speed.

  When the drum 10 is driven to rotate, according to the present reference example, the position of the center of gravity G of the load load portion 33 exists between the front-rear direction center P of the drum 10 and the rear end surface 12T of the drum 10. The drum 10 has a good rotation balance and can effectively suppress the occurrence of vibration.

  Further, according to the above reference example, since the suspensions 4A and 4B are provided on the front side and the rear side with respect to the center of gravity G of the load load portion 33, the load load portion 33 can be held stably and vibration can be reduced. It can contribute further. In addition, since the distance La from the center of gravity G to the front suspension 4A and the distance Lb from the center of gravity G to the rear suspension 4B are set to be substantially equal, both the suspensions 4A and 4B are equal. Thus, as described above, both suspensions 4A and 4B can be constituted by the same component (same component), which can contribute to simplification of the configuration.

  Next, FIG. 3 and FIG. 4 show a second reference example, which differs from the first reference example in the following points. That is, the suspensions 4A and 4B are provided such that the distance La from the center of gravity G to the front suspension 4A is longer than the distance Lb from the center of gravity G to the rear suspension 4B. Further, the portion of the held base 3a corresponding to the front suspension 4A is formed upward by a dimension H, so that the attachment length ha of the front suspension 4A is larger than the attachment length hb of the rear suspension 4B. It is set long.

  In the second reference example, the holding span (La + Lb) with respect to the load load portion 33 is increased, and the load load portion 33 can be held more stably. In this case, the load of the load load portion 33 is applied to the front suspension 4A and the rear suspension 4B, but the application is not uniform (the load applied to the front suspension 4A is defined as Wa, The load applied to the suspension 4B is Wb). In this case, Wa <Wb. If the mounting lengths ha and hb of the suspensions 4A and 4B are the same, the load applied to the spring 38 of the suspension 4A is less than the load applied to the spring 38 of the suspension 4B. The amount of deflection is small (the length of the spring in the state of receiving a load is long by the difference H), and as a result, the entire load-loading portion 33 is inclined to the front rising state.

  However, according to the second reference example, since the attachment length ha of the front suspension 4A is different from the attachment length hb of the rear suspension 4B, the inclination of the load load portion 33 can be adjusted. Since the attachment length ha of the front suspension 4A is set to be longer than the attachment length hb of the rear suspension 4B, the load load portion 33 can be held horizontally.

  5 to 7 show a third reference example. This reference example is different from the first reference example in the following points. The suspensions 4A and 4B are provided such that the distance La from the center of gravity G to the front suspension 4a is longer than the distance Lb from the center of gravity G to the rear suspension 4B. Further, as shown in FIG. 6, the free length Sa of the spring 51a in the front suspension 4A and the free length Sb of the spring 51b in the rear suspension 4B are made different, and in particular, the side where the shared load Wb is large. The free length of the spring 51b is increased. In this case, both springs 51a and 51b have the same spring constant. With this configuration, when the suspensions 4A and 4B receive the loads Wa and Wb, the spring length is the same as shown in FIG.

  Accordingly, in the third reference example, as in the second reference example, the inclination of the load load portion 33 can be adjusted. In particular, when the free length is Sa <Sb, the load load portion 33 is substantially horizontal. Can hold.

  The free lengths of both springs 51a and 51b may be the same, and the spring constants may be different. In this case, the spring constant of the spring 51b of the suspension 4B having a large shared load may be increased, and in this way, the load load portion 33 can be held substantially horizontally. Moreover, if the spring constant of the spring 51a is ka and the spring constant of the spring 51b is kb (ka <kb), the ratio Da between the shared load Wa and the spring constant ka in the front suspension 4A and the rear suspension 4B The ratio Db between the shared load Wb and the spring constant kb becomes substantially the same, and as a result, the resonance speed when the drum 10 rotates can be reduced (the resonance speed appears in one place), and the rotation balance It will be possible to further contribute to the improvement. Incidentally, when the ratios Da and Db are different from each other, different resonance rotational speeds appear on the front side and the rear side, but this is not the case.

  FIG. 8 shows a fourth reference example, which is different from the first reference example in the following points. That is, although there is a pair of left and right suspensions 61, the suspension 61 is provided at one position in the front-rear direction and at a position that substantially coincides with the center of gravity G of the load application portion 33. In addition, a tension coil-shaped regulating spring 62 is provided between the front portion of the upper part of the water tank 3 and the front side part of the inner upper part of the outer case 1 as a regulating means for exerting a tensile force in the front-rear direction. Between the rear portion of the upper portion 3 and the rear portion of the inner upper portion of the outer box 1, a tension coil-shaped regulating spring 63 is provided as a regulating means that exerts a tensile force in the front-rear direction.

  In this reference example, the number of suspensions 61 can be reduced, and the position of the suspension 61 substantially coincides with the center of gravity of the load load portion 33, so that the rotational balance is also good. Further, by providing the tension springs 62 and 63 which are restricting means for elastically restricting the movement of the load load portion 33 in the front-rear direction, the load load portion 33 can be less swayed in the front-rear direction.

  FIG. 9 shows a fifth reference example, which differs from the first reference example in the following points. That is, the suspension 61 is provided at a position in front of the center of gravity G of the load application portion 33. In particular, it is a position between the center of gravity G and the center of gravity Gf of the load-loading portion 33 when the laundry having the rated weight is accommodated, and in this case, half of the rated weight and a dehydration rate of 50%. It is provided at a position substantially coinciding with the center of gravity Gh of the load applying portion 33 when the laundry is accommodated.

  According to this reference example, when the laundry is accommodated in the drum 10, the load load portion 33 can be held more stably and the rotation balance of the drum 10 is good. That is, although the center of gravity G of the load load portion 33 is located behind the drum 10, when the laundry is accommodated in the drum 10, the load load portion 33 including the laundry is usually positioned at the center of the drum 10. The center of gravity (for example, the center of gravity Gh, Gf shown in the figure) is slightly moved toward the front side of the drum 10. Accordingly, the suspension 61 relatively matches the center of gravity of the entire load carrying portion 33 including the laundry, and the rotation balance of the drum 10 is improved.

  In particular, since the suspension 61 is positioned between the center of gravity Gf of the load load portion 33 when the laundry having the rated weight is accommodated, the load load portion 33 can be accommodated with a large or small amount of laundry. Can be held stably. Moreover, in this case, since the suspension 61 is provided at a position substantially coincident with the center of gravity Gh of the load load portion 33 when the laundry having a half weight of the rated weight and a dehydration rate of 50% is accommodated, a standard washing load amount is provided. When the laundry is washed and dehydrated, the load-loading portion 33 can be stably held in the substantially vertical position, and the displacement of the center of gravity with respect to the suspension 61 is small regardless of whether the laundry weight is large or small. The rotation balance of the drum during dehydration is improved.

  FIG. 10 shows a sixth reference example, which is different from the fifth reference example in that a movable body-enclosed balancer 64 is provided at the front portion of the drum 10. The balancer 64 is configured by enclosing, for example, a liquid, in this case, water 64b as a moving body inside the balancer body 64a. The inside of the balancer body 64a is partitioned into many small chambers and communicates with each other. The weights of the counterweights 31 and 32 are set in consideration of the weight of the balancer 64, and the center of gravity G of the load load portion 33 is set in the same manner as the fifth reference example.

  According to the sixth reference example, for example, by providing the liquid-filled balancer 64, it is possible to suppress the large swing of the drum 10 and contribute to prevention of vibration generation. Moreover, since the balancer 64 is also a heavy object, by providing it at the front part of the drum, it is possible to contribute to the position adjustment of the center of gravity of the load-loading part while reducing the increase in weight due to the counterweights 31 and 32. It can also contribute to improving the rotation balance. That is, it is possible to contribute to prevention of vibration generation and improvement of the rotation balance of the drum 10 without increasing the overall weight. The balancer may have a structure in which a large number of small spheres as a moving body are enclosed.

  11 and 12 show a seventh reference example. In this reference example, the configuration of the elastic holding device 65 serving as an elastic holding means is different from that of the second reference example. That is, the elastic holding device 65 is provided between the tension coil-shaped springs 66 and 67 that support the water tank 3 on the front side and the rear side of the upper part in the outer box 1 and between the outer lower part of the water tank 3 and the inner bottom part of the outer box 1. And attenuating portion 68 formed. In this case, the spring constant of the spring 67 closer to the center of gravity G is made larger than the spring constant of the spring 66 farther away. As shown in FIG. 12, the damping portion 68 includes a rod 69 whose upper end is connected to the outer bottom portion of the water tank 3, a cylinder 70 that is fixed upright on the inner bottom portion of the outer case 1, and an inner portion of the cylinder 70. The rod head 71 is attached to the lower end portion of the rod 69 inserted into the rod head 71, and a sliding contact ring 72 made of rubber is attached to the outer periphery of the rod head 71. The damping unit 68 does not have a function of holding the load load unit 33 such as the water tank 3 or the like, but has a vibration damping function and a function of preventing the movement of the water tank 3 at the front and rear.

In the seventh reference example, the same effect as in the second reference example can be obtained.
FIG. 13 shows an embodiment of the present invention. In this embodiment, the water tank 3 is inclined downward with respect to the horizontal, and the drum 10 is inclined downward with respect to the horizontal. This is different from the sixth reference example (see FIG. 10). That is, in this embodiment, as can be seen from each of the reference examples described above and FIG. 13, the water tank 3 held by the suspension 61 in the outer box 1, and the rotation axis in the water tank 3 is rearward with respect to the horizontal. A drum 10 that is rotatably provided in a downwardly inclined manner and that stores laundry, and a washing machine motor 17 that is provided on the drum shaft 14 at the back of the water tub 3 and drives the drum 10 to rotate. The center of gravity G of the load loading portion 33 that is a load load with respect to the suspension 61 is set so as to be positioned between the front-rear direction center of the drum 10 and the rear end surface of the drum 10, It is provided at one position in the front-rear direction and at a position that substantially coincides with the center of gravity G of the load load portion 33.

  In this embodiment, since the position of the center of gravity G of the load load portion 33 exists between the center of the drum 10 in the front-rear direction and the rear end surface of the drum 10, the rotation balance of the drum 10 is good and vibration is generated. Generation can be effectively suppressed. In addition, since the suspension 61 is provided at one position in the front-rear direction and substantially coincident with the center of gravity G of the load loading portion 33, the number of suspensions 61 can be reduced, and the position of the suspension 61 is the load. Since it almost coincides with the center of gravity of the load portion 33, the rotation balance is also good. In addition, since the drum 10 is provided so that the rotation axis of the drum 10 is inclined downward with respect to the horizontal, the laundry in the drum 10 is located on the rear side, and does not change much at that position. Therefore, the fluctuation of the center of gravity of the load load portion 33 in the state where the laundry is accommodated is reduced with respect to the center of gravity G of the original load load portion 33, and the rotation balance of the drum 10 can be stabilized. The regulating spring 63 is provided on the front side.

Longitudinal side view of drum-type washing machine showing first reference example Longitudinal side view of suspension Longitudinal side view of drum-type washing machine showing second reference example Longitudinal side view of suspension Longitudinal side view of a drum type washing machine showing a third reference example Diagram showing the free state of the spring The figure which shows the load receiving state of a spring Vertical side view of a drum type washing machine showing a fourth reference example Longitudinal side view of drum-type washing machine showing fifth reference example Vertical side view of a drum type washing machine showing a sixth reference example Vertical side view of a drum type washing machine showing a seventh reference example Longitudinal side view of damping part 1 is a longitudinal side view of a drum type washing machine showing an embodiment of the present invention. Longitudinal side view of a drum-type washing machine showing a conventional example

Explanation of symbols

3 is a water tank, 4A and 4B are suspensions, 10 is a drum, 17 is a washing machine motor (motor), 23 is a hot air supply device, 31 and 32 are counterweights, 38 are springs, 51a and 51b are springs, and 61 is a suspension. 62 and 63 are regulating springs, 64 is a balancer, 65 is an elastic holding device, 66 and 67 are springs, and 68 is a damping part.

Claims (1)

A water tank held by a suspension in the outer box;
A drum in which the rotating shaft is rotatably provided in this water tank so as to be inclined downwardly with respect to the horizontal, and the laundry is accommodated therein;
A motor that is provided on the rotating shaft at the rear surface of the water tank and rotationally drives the drum;
Set the center of gravity of the load portion that is a load to the suspension so as to be located between the front-rear direction center of the drum and the rear end surface of the drum,
The drum type washing machine according to claim 1, wherein the suspension is provided at one position in the front-rear direction and substantially coincident with the center of gravity of the load portion.

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