KR101138664B1 - Sensing device of vibration in drum washing machine - Google Patents

Abstract

The present invention relates to a drum washing machine, and more particularly, to a vibration washing apparatus for detecting a drum washing machine and determining the type of vibration.

To this end, the present invention, at least two or more installed between the main body cabinet, the tub is installed inside the main cabinet to accommodate the wash water, the damper to reduce the vibration of the tub, and the main cabinet and the tub Expansion and contraction according to the vibration of the tub, a displacement sensor for measuring the amount of expansion and contraction, the control unit for determining the type of vibration of the tub by comparing the amount of expansion and contraction measured by the displacement sensor provides a drum washing machine comprising a do.

Drum Washing Machine, Tub, Vibration, Vibration Detection, Rolling, LVDT

Description

Sensing device of vibration in drum washing machine

1 is a block diagram showing the configuration of a conventional drum washing machine,

2 is a configuration diagram showing a state in which the tub of the conventional drum washing machine up / down translation,

3 is a configuration diagram showing a state in which the tub of the conventional drum washing machine rolling motion;

Figure 4 is a front view showing an embodiment in which the displacement sensor is coupled to the tub of the drum washing machine of the present invention,

Figure 5 is a side view showing an embodiment in which the displacement sensor is coupled to the tub of the drum washing machine of the present invention,

Figure 6 is a front view showing the left / right translation of the tub of the drum washing machine of the present invention,

7 is a graph showing the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when in the state of FIG.

8 is a front view showing an up / down translation state of the tub of the drum washing machine of the present invention;

9 is a graph showing the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when in the state of FIG.                 

10 is a front view showing a rolling state of the tub of the drum washing machine of the present invention,

11 is a graph showing the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when in the state of FIG.

12 is a front view showing a pitching state of the tub of the drum washing machine of the present invention, and

13 is a graph showing the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when in the state of FIG.

* Description of Signs of Major Parts of Drawings *

101: main body 102: tub

111: left vibration detection sensor 112: right vibration detection sensor

113: rear vibration sensor

The present invention relates to a drum washing machine, and more particularly, to a vibration washing apparatus for detecting a drum washing machine and determining the type of vibration.

In general, as shown in FIG. 1, a drum washing machine includes a main body cabinet 1, a tub 2 supported by a damper 5 and a spring 4 in the main body cabinet 1, and a tub washing machine. It is largely divided into a cylindrical drum 3 into which laundry can be placed, and a driving force is transmitted by the drive unit 6 to wash the laundry in the drum.                         

The drum washing machine configured as described above performs the following operation.

Put the laundry to be washed into the drum (3), select the washing mode provided in the control unit (not shown) while the detergent is put in the detergent container, and the washing process is completed while the washing process ▶ rinsing stroke ▶ dehydration stroke is performed continuously. .

That is, if the washing mode is selected, the water supply device is operated to supply water to be used for washing into the drum (3) rotatably installed in the tub (2), the water supplied is filled by the appropriate water level and the drive unit (6) As a result, the drum 3 is rotated forward and reverse according to the home and reverse driving, and water flow is generated, thereby washing the laundry by its impact and decomposition of the detergent.

After the washing administration is completed, the rinsing is performed while going through the same process as when washing, and after the rinsing cycle is completed, the dehydrating stroke is performed.

First, during the dehydration stroke, a drain pump (not shown) is operated to completely drain the water filled in the drum 3, and then the driving unit 6 is driven.

The drum 3, which has received the driving force of the driving unit 6, rotates at a high speed to dehydrate the moisture inside the laundry by centrifugal force.

At each of the above-described strokes, an eccentricity occurs due to the deflection of the laundry in the drum 3, and the drum 3 vibrates, and the vibration is transmitted to the tub 2, causing the tub 2 to vibrate. .

If such vibrations occur outside the allowable value, it is necessary to detect whether the vibration occurs outside the allowable value because it causes great damage to each part such as the driving part 6.                         

Therefore, the tub 2 is provided with a vibration sensor 10 that can detect the vibration of the tub (2).

2 and 3 are views illustrating a state in which a vibration sensor is mounted on a conventional drum washing machine.

The vibration sensor 10 is generally mounted on one side of the lower part of the tub 2 and stretched according to the translational or rotational vibration of the tub 2 to detect whether the tub 2 is vibrated through the displacement value. .

However, the vibration sensor of the conventional drum washing machine has the following problems.

Tub (2) of the drum washing machine is of various types, such as the translation motion of the up and down / left and right, and the rolling movement to rotate around the central axis of the drum and the pitching movement of the front and rear ends of the drum in different directions of the up / down direction The vibration of the conventional drum washing machine has a disadvantage that it is not possible to distinguish the type of vibration because one vibration detection sensor 10 for detecting such a vibration is installed.

That is, as shown in FIG. 2, the displacement amount Δl ₁ of the vibration sensor 10 which is stretched and contracted when the drum 3 translates up / down or left / right, and as shown in FIG. 3, the drum 3 is to be rolled. Since the displacement amount Δl ₂ of the stretched and vibrating vibration sensor 10 is the same, only the vibration amount of the drum 3 may be known, and it may not be known what type of vibration is made.

 Accordingly, an object of the present invention is to provide a drum washing machine equipped with a vibration sensor capable of grasping the type of vibration and displacement of vibration of the drum.

In order to achieve the above object, the present invention, the body cabinet, a tub for receiving the wash water in the interior of the main cabinet, a damper for reducing the vibration of the tub, at least two between the main cabinet and the tub The drum is characterized in that it is installed and stretched in accordance with the vibration of the tub, the displacement sensor for measuring the amount of expansion and contraction, and comparing the amount of expansion and contraction measured by each displacement sensor to determine the type of vibration of the tub; Provide a washing machine.

In addition, the displacement sensor is characterized in that installed at least two or more coupled to the lower side of the left and right side of the tub, including at least one displacement sensor is further installed on the lower side of the rear end of the tub. It provides a drum washing machine characterized in that.

Hereinafter, with reference to the accompanying drawings an embodiment of the drum washing machine of the present invention will be described in detail.

In addition, in the following description, the same parts as those of the related art among the components related to the drum washing machine of the present invention will be referred to the related art, and a detailed description thereof will be omitted.

Figure 4 is a front view showing the embodiment of the displacement sensor is coupled to the tub of the drum washing machine of the present invention, Figure 5 is a side view showing the embodiment of the displacement sensor is coupled to the tub of the drum washing machine of the present invention. .

First, the tub 102 for accommodating the wash water is provided in the main body cabinet 101 constituting the appearance. In addition, inside the tub 102 is provided a drum (3: Fig. 1) is provided so as to be able to rotate with respect to the tub 102 to transfer the driving force to the laundry.

In addition, a damper 5 (see FIG. 1) and a spring (see FIG. 1) and a spring (see FIG. 1) are provided to reduce the vibration generated by the rotation of the drum (see FIG. 1). It is provided between.

In addition, the vibration sensor (111, 112, 113) for measuring the displacement of the vibration of the tub 102 is provided, the vibration sensor (111, 112, 113) is stretched in accordance with the vibration of the tub 102, and measures the expansion and displacement.

Such a vibration detection sensor (111, 112, 113) is preferably applied to the LVDT (Linear Variable Differential Transformer) sensor that generates an electrical output according to the change of magnetic flux in proportion to the amount of displacement of the stretch.

The LVDT displacement sensor can be detected in a non-contact manner, can expect a long life and high reliability, less influence by humidity, and has a relatively low price.

In addition, since the structure of the VLDT sensor is well known, it is difficult for a person skilled in the art to implement the detailed structure and description thereof in the present description.                     

At this time, the vibration detection sensor (111, 112) is preferably installed in at least two different places in order to determine the vibration type of the tub (102).

In addition, a controller (not shown) is provided to determine the vibration type of the drum based on the data of the amount of expansion and contraction measured by the vibration detection sensors 111 and 112.

On the other hand, the vibration sensor (111, 112) is preferably installed to be coupled to the end of the vibration detection sensor (111, 112) on the lower surface of the inner bottom 101 and tub 102 of the main cabinet.

At this time, the installation position of the vibration detection sensor (111, 112) is installed on the lower surface of the left and right sides of the tub 102, each one, the vibration detection sensor 111 is installed on the left and the vibration installed on the right The detection sensor 112 is preferably installed in positions symmetrical with each other.

In addition, it is more preferable that the vibration sensing sensor 113 is added to the lower side of the rear end of the tub 102 and installed.

At this time, the vibration sensor 113 is installed on the rear side is preferably installed coupled to the lowest point of the rear bottom surface of the tub (102).

The vibration sensors 111, 112, and 113 are installed at dampers 5 (see FIG. 1) provided between the tub 102 of the drum washing machine and the main cabinet 101 to measure the amount of expansion and contraction of the dampers 5 (see FIG. 1). The vibration displacement of the 102 may be measured, or the vibration displacement of the tub 102 may be measured by being installed between the tub 102 and the main cabinet 101 separately from the damper 5 (see FIG. 1). .                     

Hereinafter, the drum washing machine of the present invention having the configuration as described above will be described the operation of distinguishing the vibration type of the tub by the amount of expansion and contraction of each vibration detection sensor.

6 is a view illustrating a state in which the tub of the drum washing machine vibrates left and right, and FIG. 7 is a graph illustrating the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when the tub vibrates left and right. to be.

First, when the tub 102 translates left / right, the left vibration detection sensor 111 and the right vibration detection sensor 112 coupled to the tub 102 also expand and contract according to the translation of the tub 102. .

That is, one end of the vibration detection sensor (111, 112) is rotatably coupled to the inner side 101 of the bottom surface of the main body cabinet, and the other end of the opposite side is rotatably coupled to the lower surface of the tub 102, the tub 102 6) is moved to the left side of the X axis with respect to FIG. 6 and the displacement by -Δx occurs, the left vibration sensor 111 is shorter than the original length, the right vibration sensor 112 is the original It is longer than its length.

In addition, in contrast to the above, when the tub 102 is moved to the right to generate a displacement of Δx, the left vibration sensor 111 is extended from the original length in contrast to the above, and the right vibration sensor ( 112 is shorter than the original length.

That is, when the tub 102 translates left and right, the vibration sensors 111 and 112 provided on the lower left and right sides of the tub 102 have the same size and direction with respect to the displacement amount of the tub 102. The opposite slope value is linearly or inversely proportional.

In other words, when the tub vibrates, the displacement amount of the left vibration detection sensor 111 and the right vibration detection sensor 112 of the tub 102 are linearly proportional or inversely proportional to the inclination values having the same magnitude and opposite directions. If the tub 102 can be determined that the vibration of the translation type to the left / right.

8 is a view illustrating a state in which the tub of the drum washing machine vibrates up and down, and FIG. 9 is a graph illustrating the amount of expansion and contraction of the vibration sensor according to the vibration of the tub when the tub vibrates up and down. to be.

As described above, when the tub 102 vibrates up and down, the left vibration detection sensor 111 and the right vibration detection sensor 112 coupled to the tub 102 also expand and contract in accordance with the translation of the tub 102. Done.

That is, when the tub 102 is displaced by ΔZ along the Z axis of FIG. 8, the left vibration sensor 111 and the right vibration sensor 112 are extended from the original reference length. When the displacement by ΔZ occurs, it is shorter than the original reference length.

Therefore, when the tub 102 translates up and down, the vibration sensors 111 and 112 coupled to the tub 102 exhibit the same amount of expansion and contraction with respect to the displacement amount of the tub 102 and are linearly proportional to each other.

In other words, when the tub 102 vibrates, if the left vibration sensor 111 and the right vibration sensor 112 of the tub 102 show the same amount of stretching, the tub 102 translates up and down. It can be judged that the vibration is tangible.

10 is a view illustrating a state in which the tub of the drum washing machine of the present invention rotates and vibrates about the Y axis, and FIG. 11 illustrates the expansion and contraction of the vibration sensor according to the vibration of the tub when the tub rotates and vibrates about the Y axis. It is a graph showing the displacement amount.

Rotation of the tub 102 about the longitudinal axis of the tub 102 as described above is called a rolling motion.

When the tub 102 is in a rolling motion and vibrates to rotate left / right about the longitudinal center axis of the tub 102, the left vibration sensor 111 and the right vibration coupled to the tub 102 are rotated. Detection sensor 112 is stretched in accordance with the rolling of the tub (102).

That is, when the tub is rotated in the clockwise direction with reference to FIG. 10, the left vibration sensor 111 is extended than the original length, and the right vibration sensor 112 is shorter than the original length.

In more detail, as shown in the graph shown in FIG. 11, the elastic displacement of the left vibration sensor 111 increases as the tub 102 is rotated in a clockwise direction, and the right vibration sensor 112 of the right vibration sensor 112 is rotated. Stretch displacement is reduced as the tub 102 is rotated clockwise.

At this time, the expansion and contraction according to the rotation angle of the tub 102 of the left vibration sensor 111 and the right vibration sensor 112 has a sin waveform pattern passing through the origin.

In addition, the point that the length of the left vibration detection sensor 111 is minimized is the tub 102 is rotated by a predetermined angle (α °) counterclockwise from the original position from the bottom of the left vibration detection sensor 112 The line connecting the center point of the tub 102 through the point coupled to the tub 102 is a point that becomes a straight line.

Hereinafter, a state in which the lengths of the vibration detection sensors 111, 112, and 113 are maximized is referred to as maximum displacement, and a state in which the length of the vibration detection sensors 111, 112, and 113 is reduced to the minimum is referred to as minimum displacement.

In addition, the point of the maximum displacement in which the length of the left vibration detecting sensor 111 is maximized forms a phase difference of 180 ° with an angle (α °) leading to the point where the length becomes minimum.

In addition, the right vibration detection sensor 112 exhibits the opposite behavior to the left vibration detection sensor 111 described above.

That is, as the tub 102 is rotated in the clockwise direction, the length of the right vibration detecting sensor 112 is shortened and the tub 102 is coupled to the tub 102 from the lower end of the right vibration detecting sensor 112. A predetermined angle (α ′ °) is rotated until a line connecting the center point of the center is a straight line to achieve a minimum displacement. The maximum displacement of the right vibration sensor 112 is an angle at which the tub 102 forms a minimum displacement. It is formed at a point having a phase difference of 180 ° with (α '°).

Accordingly, when the displacement of the left vibration sensor 111 and the right vibration sensor 112 shows a sin waveform, and the value shows a phase difference corresponding to the sum of the predetermined angles (α ° + α ′ °), It can be determined that the tub 102 vibrates in the rolling motion type.

Here, the predetermined angle means the angle that the tub 102 rotates from the initial position to the position where the vibration detection sensors 111 and 112 become the minimum displacement.                     

12 is a view illustrating a state in which a tub of the drum washing machine of the present invention rotates and vibrates about an X axis, and FIG. 13 illustrates an expansion and contraction amount of a vibration sensor according to the vibration of the tub when the tub rotates and vibrates about an X axis. Is a graph.

As described above, the tub 102 is rotated about the axis in the direction orthogonal to the longitudinal axis of the tub 102, which is called a pitching motion.

When the tub 102 vibrates to rotate about the X axis by pitching, the left vibration sensor 111 and the right vibration sensor 112 and the rear vibration sensor coupled to the tub 102 ( 113 is stretched in accordance with the pitching of the tub (102).

That is, when the tub rotates in a clockwise direction with respect to the X axis of FIG. 12 and a displacement occurs by δ °, the left vibration sensor 111 and the right vibration sensor 112 are extended from their original lengths. , Rear vibration sensor 113 is shorter than the original length.

At this time, the expansion and contraction according to the rotation angle of the tub 102 of the left vibration sensor 111, the right vibration sensor 112 and the rear vibration sensor 113 has a sin waveform pattern passing through the origin. do.

In addition, the expansion and contraction of the left vibration detection sensor 111 and the right vibration detection sensor 112 represents the same sin waveform without phase difference, and the expansion and displacement of the rear vibration detection sensor 113 is the left vibration detection sensor 111. ) And a sin waveform having a predetermined angle phase difference with respect to the waveform of the amount of stretching of the right vibration detecting sensor 112.

Thus, as described above, the displacement of the left vibration detection sensor 111 and the right vibration detection sensor 112 shows the same sin waveform without phase difference, and the displacement of the rear vibration detection sensor 113 is the left vibration. When the sin waveform having a phase difference of a predetermined angle and a sin waveform of the detection sensor 111 and the right vibration detection sensor 112 is shown, it may be determined that the tub 102 vibrates a pitching motion type.

Here, the phase difference and the amplitude of the sin waveform of the left vibration detection sensor 111, the right vibration detection sensor 112, and the sin waveform of the rear vibration detection sensor 113 are the tubs of the respective vibration detection sensors 111, 112 and 113. Values vary depending on the angle of 102 and the like, and thus are not specific in this detailed description, but can be sufficiently derived by those skilled in the art.

On the other hand, although the graph of the amount of expansion and contraction of each vibration detection sensor (111, 112, 113) according to the displacement of the tub 102 shown in the graph generally showed a wide range, the vibration or displacement of the vibration in the actual tub 102 Since it is not so large, the value actually used is within a predetermined range around the origin.

In addition, the angle of the inclination and the maximum displacement of the straight line shown in the graph and the angle of the minimum displacement may vary depending on the installation position of each vibration sensor 111, 112, 113 and the angle of the tub 102 in the translation or rotation direction. Although the value is not specified in the detailed description of the present invention will be apparent to those skilled in the art.

As described above, according to the present invention, there is an effect that can accurately grasp the type of vibration when the tub vibrates.

In addition, by applying the LVDT as the vibration detection sensor, it is possible to detect non-contact, long life and high reliability can be expected, there is little effect of humidity and relatively low price.

Claims (12)

A main cabinet 101; A tub 102 installed inside the main cabinet 101 to accommodate washing water; A damper (5) for reducing vibration of the tub (102); Displacement sensors (111, 112, 113) installed between at least two of the main cabinet (101) and the tub (102) to stretch according to the vibration of the tub and measure the amount of stretching; Control unit for determining the vibration displacement of the tub 102 and the type of vibration by comparing the amount of expansion and contraction measured by each displacement sensor, At least two displacement sensors 111, 112, and 113 are coupled to the lower side of the left and right sides of the tub 102, and are installed to be coupled to the lower side of the rear end of the tub 102. One end of the displacement sensor (111, 112, 113) is rotatably coupled to the surface of the tub 102, the other end is rotatably coupled to the bottom of the main cabinet 101, Drum washing machine characterized in that it is determined whether the tub 102 is in translation or rolling up or down or rolling vibration or pitching vibration by the amount of expansion and contraction measured by the displacement sensors (111, 112, 113). The method of claim 1, The displacement sensor (111, 112, 113) is a drum washing machine, characterized in that the linear variable differential Trnsformer (LVDT) to measure the amount of stretching as a change in magnetic force. The method of claim 1, The displacement sensor (111, 112, 113) is integrally coupled to the damper drum washing machine, characterized in that for detecting the vibration of the tub by measuring the displacement of the damper. delete delete delete The method of claim 1, The displacement sensor (111, 112) drum washing machine, characterized in that installed on the left and right sides of the tub symmetrically. The method of claim 1, The displacement sensor 113 is a drum washing machine, characterized in that installed coupled to the lowest point of the drum. The method of claim 1, With respect to the vibration displacement of the tub, the amount of expansion and contraction measured by the displacement sensor 111 coupled to the left bottom surface of the tub 102 and the amount of expansion and contraction measured by the displacement sensor coupled to the right bottom 112 are linear in opposite directions. Drum proportional or inversely proportional to the tub 102, the drum washing machine, characterized in that it is determined that the translation state. The method of claim 1, With respect to the vibration displacement of the tub, the amount of expansion and contraction measured by the displacement sensor 111 coupled to the left bottom surface of the tub 102 and the amount of expansion and contraction measured by the displacement sensor coupled to the right bottom 112 are linear in the same inclination direction. If proportional to the tub 102, the drum washing machine, characterized in that it is determined to translate the state up / down. The method of claim 1, Regarding the vibration displacement of the tub, the amount of expansion and contraction measured by the displacement sensor 111 coupled to the left bottom surface of the tub 102 and the amount of expansion and contraction measured by the displacement sensor coupled to the right bottom 112 show a phase difference of a predetermined angle. The drum washing machine is characterized in that the tub 102 is determined to be in a rolling state when the sinusoidal waveform is shown. The method of claim 1, With respect to the vibration displacement of the tub, the amount of expansion and contraction measured by the displacement sensor 111 coupled to the left bottom surface of the tub 102 and the amount of expansion and contraction measured by the displacement sensor coupled to the right bottom surface 112 do not show a phase difference and are sin waveforms. Shows, the amount of stretch measured by the displacement sensor 113 coupled to the rear bottom of the tub 102 and the amount of stretch measured by the displacement sensor 111 coupled to the left bottom of the tub and the displacement sensor coupled to the right bottom ( And a sin waveform having a predetermined angle phase difference with respect to the amount of expansion and contraction measured in 112), and the tub washing machine is determined to be in a pitching vibration state.

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