KR19990052647A - Centrifugal Balance Control Device of Washing Machine - Google Patents

Abstract

The present invention relates to a device for reducing the dehydration vibration of the washing machine, in particular in order to efficiently attenuate the vibration and noise caused by the unbalance due to the uneven distribution of the laundry 11 during centrifugal dehydration, washing tank in the case (1) (4) and the dehydration tank (5) is installed in two layers, the snubber bar (8) for absorbing vibration is fixedly supported on the outer periphery of the washing tank (4) and the balancer is provided at the top and bottom of the dehydration tank (5) Each of the fixed installation of the washing machine, the upper end of the dehydration tank (5), the balance liquid 97 and the metal ball (94) is a complex balancer 90 is built in a structure, the upper portion of the dehydration tank (5) By installing the composite balancer 90 having the ball 94 and the balancing liquid 97 fixed therein, the initial transient vibration and noise can be suppressed by suppressing the tendency of the metal ball 94 due to the flow action of the balancing liquid 97 in the unstable region. Improves balancing performance In the centrifugal balance control device of the washing machine to be able to maintain the stable system by minimizing the balancing deviation according to the dimensions and roundness of the inner, outer race 91, 92 to guide the metal ball 94 It is about.

Description

Centrifugal Balance Control Device of Washing Machine

The present invention relates to a device for reducing the dehydration vibration of the washing machine, and in particular, by attaching a balancer using a balancing liquid and a metal ball to the upper end of the dehydration tank vibration caused by the unbalance of the laundry during centrifugal dehydration And it relates to a centrifugal balance control device of the washing machine to absorb noise and maintain a stable system, and to suppress the initial excessive vibration of the balancer to improve the balancing performance.

FIG. 1 schematically illustrates a structure of a pulsator washing machine which is generally used, and a motor 2 is fixedly installed at a lower side of the washing machine case 1, and a lower portion of the case 1 is disposed below the central axis. A clutch 3 connected to the motor 2 is mounted, and a washing tank (outer tank) 4 and a dewatering tank (inner tank) 5 are provided in multiple layers on the central axis of the clutch 1, and the dewatering tank ( A pulsator 6 is coupled to the central axis of the inner bottom of 4), and a damper 7 supporting the washing tub 4 in all directions and an oscillation coupled thereto on the outer periphery of the lower end of the tub 4. Snubber bar (Snubber Bar: 8) for absorbing the symmetry is fixed, respectively, the upper and lower inner circumference of the dehydrating tank (5) ring-shaped upper and lower ball balancers (9, 10) structure It is.

In the conventional washing machine, when the laundry 11 is balanced at the time of dehydration, the washing tank 4 and the dewatering tank 5 rotate without eccentricity to allow smooth dehydration, but when the laundry 11 is placed in an unbalanced state. Centrifugal force acts toward the center of gravity in the centrifugal dehydration process so that the washing tank 4 and the dehydration tank 5 are shaken severely.

In order to alleviate the vibration caused by such eccentricity, as described above, the washing tank 4 is supported by the damper 7 and the snubber bar 8 so that the impact generated in the washing tank 4 and the dewatering tank 5 is reduced. By not being transmitted to the case (1) to reduce the noise and vibration.

On the other hand, the upper and lower ball balancers (9), (10) is attached to compensate for the unbalanced mass generated when the laundry 11 is unevenly distributed to one side when the laundry (11).

As shown in FIG. 2, the upper ball balancer 9 includes an inner race 9a and an outer race 9b for guiding, and a plurality of metal balls 9c serving as a balancing mass therein. It is built, the remaining space is filled with a hydraulic oil (Viscous Oil) (9d) for suppressing excessive movement of the metal ball (9c).

Here, CR is the rotation center, CG is the center of gravity as the laundry 11 is ubiquitous when the laundry 11 is inserted, e is the eccentric distance between the rotation center and the center of gravity, C is the laundry 11 is ubiquitous Centrifugal force acting on the metal ball 9c when rotating in the closed state, T is tangential friction force generated when the metal ball 9c moves along the inner circumferential surface of the outer race 9b, and R is the metal ball 9c. The viscosity resistance due to the viscosity of the hydraulic oil (9d) during the movement of is shown.

In addition, since the lower ball balancer 10 also has the same structure, detailed description thereof will be omitted, and the same reference numerals are given to 10, 10a, 10b, 10c, and 10d, respectively.

Referring to the operation process of the centrifugal balance by the conventional upper and lower ball balancers (9), (10) having the structure as described above are as follows.

Figure 3a and Figure 3b is a planar view showing the centrifugal balance control process by the action of the upper and lower ball balancers (9), 10 when the laundry (11) is put into the omnipresent state in the washing machine according to the prior art, 3A illustrates an operating state before the first resonance occurs in which the laundry 11, the metal balls 9c, and 10c are ubiquitous, and transient vibration occurs, and FIG. 3B illustrates the metal ball after the first resonance occurs. 9c) and (10c) shows the state of operation at the moment to move to the opposite position to the laundry 11 to maintain the centrifugal balance.

That is, as shown in FIG. 3A, when an unbalanced mass is loaded in the dewatering tank 5 due to the deflection of the laundry 11 during dehydration, the unbalanced mass is set between the rotation center CR and the center of gravity CG by the unbalanced mass. The eccentric distance (e) is present, and until the first resonance occurs, the unbalanced mass and the metal balls 9c and 10c are ubiquitous in the same direction, causing a large amplitude and causing vibration noise. Subsequently, when the first resonance occurs, as shown in FIG. 3B, the displacement of the metal balls 9c and 10c is moved to compensate for the unbalanced mass to compensate for the unbalanced mass, thereby maintaining a 180 ° phase difference. Will be done.

At this time, various forces as shown in Figure 2 act on the metal ball (9c), the size of the centrifugal force (C) corresponding to the surface roughness of the outer race (9b) and the eccentric mass of the laundry (11). The tangential frictional force T related to and the viscous resistance R of the hydraulic oil 9d itself act in combination.

The ball balancer 9 controls the initial transient state of the metal ball 9c by increasing or decreasing the viscosity resistance R of the metal ball 9c by adjusting the viscosity of the hydraulic oil 9d. It can prevent the movement.

However, at the beginning of the centrifugal dehydration, as described above, the metal ball 9c and the laundry 11 are unevenly distributed in the same direction to maintain an unstable state, in particular, when the upper and lower ball balancers 9 and 10 are attached. In the first and second resonances as shown in the graph of FIG. 4, the vibration of the washing tank 4 grows due to abnormal vibration caused by excessive metal ball 9c in the region where the centrifugal balance becomes unstable. 1) It may cause noise to collide with the inner wall.

A detailed example of an instability state caused by excessive movement of the metal balls 9c and 10c will be described below with reference to FIGS. 5A and 5B.

5a and 5b is an exemplary view for explaining the operating state of the upper and lower ball balancers 9, 10 according to the prior art, Figure 5a is a laundry 11 and the upper and lower ball balancer (9), (10) balanced and stable state, Figure 5b shows the unstable state of the laundry 11 and the upper and lower ball balancers (9), (10) are unbalanced.

As shown in the figure, when 500 g of eccentric mass is generated inside the dehydration tank 5, after the primary resonance of the system occurs, the metal balls 9c and 10c move the axis of rotation of the pulsator 6. Maintain a balance of power around you. That is, when the state as shown in FIG. 5A is maintained, a stable force balance is achieved, and in the state as shown in FIG. 5B in which the primary resonance and the secondary resonance occur, the angles in the upper and lower ball balancers 9 and 10 are different. The metal balls 9c and 10c are interlaced with each other, resulting in unstable force imbalance, which acts as a moment component in the "A" direction, causing severe vibration in the up and down direction, and only after the secondary resonance occurs. The equilibrium between force and moment is maintained to maintain centrifugal balance. If excessive tilting of the upper and lower ball balancers 9 and 10 occurs in the unstable regions of the primary and secondary resonances, the amplitude of the vibrations increases and causes vibration divergence.

As described above, the conventional washing machine may have a small compensating capacity of about 200 to 300 g by moment balancing, but in the case where the upper and lower ball balancers 9 and 10 are adopted to reduce the amplitude, Since both the moment and the moment must be balanced, the optimum mass compensation for each of the upper and lower ball balancers (9) and (10) is necessary. In particular, the upper and lower ball balancers (9) and (10) before resonance occurs. Since it is placed in the same position as the laundry 11, there is a problem that the stability is significantly worsened to emit vibration.

In addition, there is a problem in that the product cost is increased by excessively charging the metal ball (9c), (10c) in the upper and lower ball balancers (9), 10, more than necessary.

Accordingly, the present invention has been made to solve the above problems, by attaching a balancer using a balancing liquid and a metal ball to the upper end of the dehydration tank vibration caused by the unbalance of the laundry during centrifugal dehydration And it is to provide a centrifugal balance control device of the washing machine that can absorb the noise to maintain a stable system, and to suppress the initial excessive vibration of the balancer to improve the balancing performance.

1 is a schematic view showing the structure of a typical pulsator washing machine,

Figure 2 is a plan view and a cross-sectional view showing the structure of the ball balancer according to the prior art and the centrifugal balance operation principle when the laundry is put;

Figure 3a and Figure 3b is a planar view showing the centrifugal balance control process by the action of the ball balancer when the laundry is put in the omnipresent state in the washing machine according to the prior art,

3a is an operating state diagram before the first resonance occurs in which the laundry and the metal ball are unevenly distributed to one side, causing excessive vibration;

Figure 3b is an operating state at the moment when the metal ball is moved to the corresponding position of the laundry to maintain the centrifugal balance after the first resonance occurs;

4 is a frequency-amplitude diagram showing a stable and unstable region when a resonance occurs in a ball balancer according to the prior art;

5a and 5b is an exemplary view for explaining the operating state of the upper and lower ball balancer according to the prior art,

Figure 5a is a stable state of the laundry and the upper and lower ball balancer,

Figure 5b is unstable laundry and the upper and lower ball balancer unbalanced,

Figure 6 is a schematic diagram showing a centrifugal balance control device of the washing machine according to the present invention,

7 is a cross-sectional view showing the structure of a composite balancer according to the present invention;

8 is a load-amplitude relationship diagram comparing the centrifugal balance performance of the composite balancer and the conventional ball balancer of the present invention.

* Explanation of symbols for main parts of the drawings

1: case 2: motor

3: clutch 4: washing tank (outer tank)

5: dehydration tank (inner tank) 6: pulsator

7: damper 8: snubber bar

11: laundry 12: rotating shaft support

90: compound balancer 91, 101: inner race

92, 102: outer race 93: diaphragm

94, 104: Metal ball 95: Ball race

96, 106: working oil 97: balancing liquid

100: ball balancer

Centrifugal balance control device of the washing machine according to the present invention for achieving the above object is a washing tank and a dehydration tank is installed in the casing in multiple layers, the snubber bar for fixing the vibration to the outer periphery of the washing tank fixed support and the top and In the washing machine is installed fixed to the balancer at the lower end, the dehydrator is characterized in that the upper end of the dehydration tank is arranged a complex balancer with a balancing liquid and a metal ball.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1 and 6, the centrifugal balance control device of the washing machine according to the present invention, the motor 2 is fixedly installed on the lower side of the washing machine case 1, the lower end of the central axis of the case (1) The clutch 3 connected to the motor 2 is mounted, and a washing tank 4 and a dehydration tank 5 are provided in two layers on the central axis of the clutch 1, and the inner bottom of the dehydration tank 4 is provided. A pulsator 6 is coupled to the central shaft, and a damper 7 supporting the washing tub 4 from all sides and a snubber coupled thereon to the outer periphery of the lower end of the washing tub 4. The bars 8 are symmetrically fixed to each other, and ring balancers 90 and 100 are fixed to the upper and lower inner circumferences of the dehydration tank 5, respectively.

At the lower end of the dehydration tank 5, the ball balancer 100 is disposed as in the prior art. The ball balancer 100 is provided with a guide inner race 101 and the outer race 102, a plurality of metal balls 104 to serve as a balancing mass therein is built, the remaining space portion Hydraulic oil 106 is filled to suppress excessive movement of the metal ball 104.

In addition, the composite balancer 90 is disposed at the upper end of the dehydration tank 5 as shown in FIG. The composite balancer 90 is provided with an inner race 91 and an outer race 92 for guiding, a plurality of diaphragms 93 are formed therein, and the inner and outer races 91 and 92. A ball race 95 filled with a plurality of metal balls 94 and hydraulic oil 96 is provided therein, and is filled with a balancing liquid 97 whose flow rate is controlled by the diaphragm 93.

The composite balancer 90 is configured to maintain the balancing performance ratio of the balancing liquid 97 / metal ball 94 to 0.5 to 1.5, and to maintain the filling ratio of the balancing liquid 97 to 50 to 80% It is desirable to.

Further, in manufacturing the composite balancer 90, it is possible to form a single set of upper and lower injection moldings and weld adjacent portions of these injection moldings, and form a plurality of bosses (not shown) at predetermined intervals along the inner side of the bottom surface. A screw is inserted into the hole of the boss so that it can be fastened on the inner circumferential surface of the dehydration tank 5.

Referring to the operation process of the centrifugal balance by the upper and lower balancers 90, 100 according to the present invention having the structure as described above are as follows.

If the unbalanced mass is loaded in the dehydration tank 5 by the deflection of the laundry 11 during dehydration, the unbalanced mass causes a predetermined eccentric distance between the center of rotation and the center of gravity, and until the first resonance occurs. The unbalanced mass and the metal balls 94 and 104 are ubiquitous in the same direction to generate vibration noise while generating a large amplitude, and when the first resonance occurs, the phase difference of 180 ° is maintained and the metal is maintained. The balls 94 and 104 are moved to compensate for the above unbalanced mass, and the vibration noise before the first resonance occurs by the flow of the liquid balancer 97 can be significantly reduced.

8 is a load-amplitude relationship diagram comparing the centrifugal balancing performance of the composite balancer 90 and the conventional ball balancer 9 of the present invention. According to the graph, the vibration width is higher than that of the conventional ball balancer 9. It can be seen that the overall decrease, this difference in vibration width is shown to appear larger as the unbalance load increases.

Therefore, the centrifugal balance control device according to the present invention can prevent excessive vibration by inhibiting the tendency of the metal ball 94 due to the flow action of the balancing liquid 97 in the unstable region, and prevents the metal ball 94 It is possible to minimize the balancing deviation according to the dimensions and roundness of the inner and outer races 91 and 92 to guide.

When the composite balancer 90 of the present invention is fixedly installed at the upper and lower ends of the dehydration tank 5, the excellent balance as described above is exerted, and the centrifugal balance control device employing the composite balancer 90 is applied. Is widely applicable to over-hung type dewatering tanks and many other top and bottom balancing mechanisms.

The effects of the present invention that can be expected by the configuration and action as described above are as follows.

The centrifugal balance control device of the washing machine according to the present invention is fixed to the balancing liquid 97 in the unstable region by fixing the complex balancer 90 with the metal 94 and the balancing liquid 97 built in the upper portion of the dehydration tank (5) By suppressing the tilting of the metal ball 94 according to the flow action to prevent the initial excessive vibration and noise, and to improve the balancing performance, the inner and outer race 91 to guide the metal ball 94, It is possible to maintain a stable system by minimizing the balancing deviation according to the dimensions and roundness of (92).

Claims (7)

A washing tank and a dehydration tank are installed in a plurality of cases, and a snubber bar for absorbing vibrations is fixedly supported on the outer circumference of the washing tank, and a balancer is fixed to each of the upper and lower ends of the dewatering tank, wherein the dehydrating tank is provided with a balancing liquid. Centrifugal balance control device for a washing machine, characterized in that the metal ball has a built-in composite balancer. According to claim 1, The composite balance is provided with a guide inner race and an outer race, a plurality of diaphragm is formed therein, a ball race filled with a plurality of metal balls and operating oil in the inner and outer race. In addition, the centrifugal balance control device of the washing machine, characterized in that the layered with a balancing liquid in which the flow rate is controlled by the diaphragm. The centrifugal balance control apparatus of claim 1, wherein the complex balancer is configured to maintain a balancing performance ratio of the balancing liquid / metal ball in a range of 0.5 to 1.5. The centrifugal balance control apparatus of claim 1, wherein the composite ball balancer is configured to maintain a filling ratio of the balancing liquid in a range of 50 to 80%. The centrifugal balance control device according to claim 1 or 2, wherein the composite balancer is formed of a pair of upper and lower injection moldings, and is formed by welding adjacent parts of the injection molding products. 3. The composite balancer according to claim 1 or 2, wherein a plurality of bosses are formed at predetermined intervals along the inner circumference of the bottom surface, and a screw is inserted into a hole of the boss to be fastened on the inner circumferential surface of the dehydration tank. Centrifugal balance control device of the washing machine. The centrifugal balance control apparatus of a washing machine according to claim 1, wherein the dehydration tank is fixed to each of the complex balancers at upper and lower ends thereof.