WO2017179930A2 - Washing machine - Google Patents

Abstract

The present invention relates to a washing machine comprising: a tub provided inside a cabinet and storing washing water therein; and a plurality of super-hydrophobic micro-protrusions formed on the inner surface of the tub to remove residual water within the tub. Accordingly, since the plurality of super-hydrophobic micro-protrusions are formed on the inner surface of the tub, the residual water remaining inside the tub can be cleanly removed using the lotus effect, thereby maintaining a clean state of the washing machine.

Description

washer

The present invention relates to a washing machine with improved drainage performance.

In general, a washing machine is a device that cleans a laundry object by washing, rinsing, dehydrating, drying, and the like to remove contaminants on clothes, etc. (hereinafter referred to as a laundry object) contained in a drum by using water and a detergent. to be.

The washing machine may be classified into a pulsator type washing machine in which washing is performed by water flow according to the operation of a pulsator, and a drum type washing machine using drops of an object to be washed by rotation of the drum itself.

The drum type washing machine includes a tub provided inside the cabinet and the wash water is stored therein, a drum rotatably installed in the tub, a water supply unit for supplying the wash water to the tub, and washing the tub after the washing is finished. A drain for discharging the water out of the cabinet.

The drainage device may include a drain hose and a drain pump.

The drain hose guides the wash water of the tub to the outside of the cabinet, and the drain pump discharges the wash water flowing along the drain hose.

However, the following problems occur when the contaminated wash water inside the tub does not discharge to the outside of the cabinet and remains inside the tub.

First, when the clean wash water supplied to rinse the wash water is mixed with the contaminated wash water remaining inside the tub, the efficiency of the rinsing administration decreases and the amount of wash water required for proper rinsing and the washing time increase.

Second, the inside of the tub is very high humidity even after the operation of the drain pump, the contaminated wash water of the tub will remain in the form of water droplets on the inner surface of the tub without draining through the drain hose. At this time, the residual water remaining on the inner surface of the tub causes odor due to the generation of bacteria, such as mold, and contaminates the newly watered water in the subsequent use of the washing machine.

Therefore, the first object of the present invention is to provide a washing machine capable of discharging the washing water remaining on the inner surface of the tub to the outside without leaving.

In addition, a second object of the present invention is to provide a washing machine capable of directing the flow of residual water remaining on the inner surface (front and rear, circumferential surface, sump) of the tub.

Further, a third object of the present invention is to provide a washing machine capable of preventing undercut of the injection mold after injection molding the tub by the injection mold.

Such a first object of the present invention may be achieved by providing a super water-repellent fine protrusion where water can reach the inside of the washing machine, and removing residual water inside the washing machine by using the lotus leaf effect of the super water-repellent fine protrusion.

The second object of the present invention can be achieved by forming an asymmetrical gradient on both inclined surfaces of the super water-repellent micro-projections to allow water to flow toward the drain.

A third object of the present invention can be achieved by providing an orientation to the super water-repellent micro-projections in the direction in which the injection mold is separated to prevent the undercut of the injection mold.

According to an embodiment related to the present invention, a tub provided inside the cabinet and storing the washing water therein; And a plurality of super water-repellent fine protrusions formed on an inner surface of the tub to remove residual water in the tub.

According to an example related to the present invention, the plurality of super water-repellent fine protrusions may be injection molded by an injection mold together with the tub, and may be integrally formed on an inner surface of the tub.

According to an example related to the present invention, the tub, the tub for forming the front of the tub when the inlet for the input of the laundry object is formed on the front surface, the tub is divided into the front portion and the rear portion along the circumferential surface cover; And a tub body coupled to the rear end of the tub cover and forming a rear portion of the tub.

According to an example related to the present invention, the plurality of super water-repellent fine protrusions may be formed on the front surface of the tub cover and the rear surface of the tub body.

According to an example related to the present invention, each of the plurality of super water-repellent microprotrusions may have an upper width smaller than or equal to a lower width.

According to an example related to the present invention, each of the plurality of super water-repellent fine protrusions may be formed in any one of a round shape, a triangle, and a quadrangle.

According to an example related to the present invention, the plurality of super water-repellent micro-projections may be symmetrically formed on both sides with respect to one-way centerline spaced apart from each other in parallel with the inner surface of the tub.

According to an example related to the present invention, the plurality of super water-repellent micro-projections are spaced in parallel with each other in a direction crossing the first direction center line and the first direction center line which are spaced in parallel with each other along the inner surface of the tub. Both sides may be formed symmetrically based on the two-way centerline.

According to an example related to the present invention, the first direction center line and the second direction center line may be formed in a lattice shape.

According to another example related to the present invention, the plurality of super water-repellent fine protrusions may be formed on the circumferential surface of the tub.

According to another example related to the present invention, the plurality of super water-repellent fine protrusions may be formed to protrude along the longitudinal direction in the tub in a direction in which the injection mold is separated to prevent undercut of the injection mold after injection molding.

According to another example related to the present invention, the plurality of super water-repellent fine protrusions may be spaced apart from each other in the circumferential direction of the tub.

According to another example related to the present invention, the plurality of super water-repellent micro-projections may be symmetrically formed on both sides of the circumferential center line of the circumferential surface spaced apart from each other in parallel with the circumferential surface of the tub.

According to another example related to the present invention, the plurality of super water-repellent micro-projections, the longitudinal centerline of the circumferential surface spaced apart in parallel to each other along the circumferential surface of the tub so that the residual water in the tub flows in the circumferential direction Both sides may be asymmetrically formed as a reference.

According to another embodiment related to the present invention, the sump is formed on the bottom surface of the tub, the sump having a drain for discharging the washing water in the tub to the outside, wherein the plurality of super water-repellent fine projections are the sump It can be formed on the surface of the.

According to another embodiment related to the present invention, the sump is formed concave along the longitudinal direction of the tub toward the front surface of the tub at the lower end of the rear surface of the tub, the plurality of super water-repellent micro-protrusions are injected after injection molding In order to prevent the undercut of the mold may be formed to protrude along the longitudinal direction of the sump in the direction in which the injection mold is separated.

According to another example related to the present invention, the sump is formed at a position lower than the circumferential surface of the tub, and may be inclined downward toward the front surface of the tub.

According to another example related to the present invention, the drain is formed to be spaced apart in one direction from the longitudinal centerline of the sump, the sump, one side is in communication with the drain, so that the remaining water in the sump to guide the drain It may further include a residual guide flow path formed to be spaced apart from the longitudinal center line of the sump.

According to another embodiment related to the present invention, the plurality of super water-repellent micro-projections, longitudinal centerline of the sump spaced apart in parallel to each other along the bottom surface of the sump so that the residual water in the sump flows toward the residual water guide flow path portion Both sides are asymmetrically formed on the basis of the first slope surface portion having a small inclination toward the residual water guide passage portion and a second slope surface having a relatively large slope on the other side facing the direction opposite to the residual water guide passage portion. Can be.

According to this invention comprised as mentioned above, it has the following effects.

First, since a plurality of super water-repellent fine protrusions are formed on the inner surface of the tub, by using the lotus leaf effect to remove the residual water remaining inside the tub to clean the washing machine.

Second, as the super water-repellent micro-projections are formed to have a directionality, it is possible to prevent the occurrence of undercuts (that the micro-projections of the mold and the micro-projections of the tub interfere with each other) when the mold is separated after completion of the injection molding.

Third, a gradient (SLOPE) may be formed in the super water-repellent micro-projections so that water flowing along the micro-projections may flow in a predetermined direction, for example, toward a drain.

Fourth, as the washing water containing contaminants is rolled by the super water-repellent micro-projections so as not to remain in the tub and flows to the drain, fresh rinsing water that is newly supplied may be prevented from mixing with the contaminated washing water.

Fifth, it is possible to remove the odor caused by the residual water in the tub, and to maintain the hygiene inside the tub by the self-cleaning inside the tub by moving the foreign matter inside the tub to the drain along the fine projection with the spherical water droplets Can be.

1 is a front view of the tub according to the present invention seen from the front.

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3a is a picture showing a drop of water drops falling from the lotus leaf.

Figure 3b is a conceptual diagram for explaining the lotus leaf effect of the super water-repellent micro-projections applied to the inside of the washing machine according to the present invention.

3C is a conceptual diagram for explaining a correlation between a contact angle between water and a surface and a water repellent property.

Figure 4 is a view showing an example of the super water-repellent micro-projections applied to the tub cover according to the present invention.

5 is a view showing an example in which the super water-repellent micro-projections according to the present invention is applied to the tub body.

6a and 6b is a schematic view for explaining a manufacturing method of the tub by the plastic injection mold according to the present invention, Figure 6a shows a case in which the injection mold is closed and Figure 6b shows a case in which the injection mold is open.

Figure 7a is a schematic diagram showing a first embodiment of a super water-repellent micro-protrusion according to the present invention.

FIG. 7B is a plan view of the super water-repellent microprojection of FIG. 7A seen from above. FIG.

Figure 8a is a schematic diagram showing a second embodiment of the super water-repellent micro-protrusion according to the present invention.

8B is a plan view of the super water-repellent microprojection of FIG. 8A seen from above.

Figure 9a is a schematic diagram showing a third embodiment of the super water-repellent micro-projections according to the present invention.

9B is a plan view of the super water-repellent microprojection of FIG. 9A seen from above.

Figure 10a is a schematic diagram showing a fourth embodiment of the super water-repellent micro-projections according to the present invention.

FIG. 10B is a plan view of the super water-repellent microprojection of FIG. 10A seen from above.

Figure 11a is a schematic diagram showing a fifth embodiment of the super water-repellent micro-projections according to the present invention.

FIG. 11B is a plan view of the super water-repellent microprojection of FIG. 11A seen from above. FIG.

Figure 12a is a schematic view showing a sixth embodiment of the super water-repellent micro-projections according to the present invention Figure 12b is a plan view from above the super water-repellent micro-projections of Figure 12a.

Figure 13a is a schematic diagram showing a seventh embodiment of the super water-repellent micro-protrusions according to the present invention.

13B is a plan view of the super water-repellent microprojection of FIG. 13A seen from above.

14 is a perspective view showing an example in which the super water-repellent fine projection according to the present invention is applied to the circumferential surface of the tub cover.

15 is a perspective view showing an example in which the super water-repellent fine projection according to the present invention is applied to the circumferential surface of the tub body.

16 is a schematic view showing the structure of the super water-repellent micro-projections having an asymmetric inclined surface according to the present invention.

Figure 17a and 17b is a schematic diagram for explaining the manufacturing method of the tub by the plastic injection mold according to the present invention, Figure 17a is a case in which the injection mold is closed and Figure 17b is a case in which the injection mold is open, Figure 17c is a side view showing a state seen from the DD direction of FIG. 17b.

FIG. 18A is a partially enlarged view of “C” in FIG. 14 and is a plan view showing an example of super water-repellent microprojections having directivity.

FIG. 18B is a cross-sectional view illustrating a cross-sectional shape of the super water-repellent fine protrusion viewed in the E-E direction of FIG. 18A.

Figure 19a is a plan view showing another example of the super water-repellent micro-protrusion having a direction according to the present invention.

19B is a cross-sectional view illustrating a cross-sectional shape of the super water-repellent microprojection of FIG. 19A.

20 is a front view of the tub according to the present invention seen from the front.

FIG. 21 is a cross-sectional view taken along line II of FIG. 20.

FIG. 22A is a cross-sectional view taken along line G-G showing an example of a sump in FIG. 21.

FIG. 22B is a perspective view illustrating a super water-repellent fine protrusion applied to the sump of FIG. 22A.

FIG. 23A is a perspective view illustrating another example of the sump in FIG. 21.

FIG. 23B is a plan view of the sump of FIG. 23A seen from above. FIG.

FIG. 23C is a sectional view taken along the line H-H in FIG. 23A.

24A and 24B are schematic views illustrating a method of manufacturing a tub by a plastic injection mold according to the present invention, FIG. 24A is a case where the injection mold is in a closed state, and FIG. 24B is a case where the injection mold is in an open state. FIG. 24C is a side view as seen in direction II of FIG. 24B. FIG.

FIG. 25A is an enlarged view of a portion “X” of FIG. 22B and is a plan view illustrating an example of super water-repellent microprojections having directivity.

FIG. 25B is a cross-sectional view illustrating a cross-sectional shape of the super water-repellent fine protrusion viewed in the J-J direction of FIG. 25A.

Figure 26a is a plan view showing another example of the super water-repellent micro-protrusion having a direction according to the present invention.

FIG. 26B is a cross-sectional view illustrating a cross-sectional shape of the super water-repellent fine protrusion viewed in the K-K direction of FIG. 26A.

EMBODIMENT OF THE INVENTION Hereinafter, the washing machine which concerns on this invention is demonstrated in detail with reference to drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural forms unless the context clearly indicates otherwise.

1 is a front view of the tub 10 according to the present invention seen from the front, and FIG. 2 is a sectional view taken along the line A-A of FIG.

Tub 10 provides a storage space for storing the wash water therein. Tub 10 is provided inside the cabinet. The tub 10 is fixedly supported inside the cabinet by a support member such as a damper and a spring.

Tub 10 is made of a cylindrical shape, the inlet for the input of the laundry object may be formed on the front surface (10a ') of the tub (10).

A rubber gasket 11 may be formed in the circumferential direction along the circumference of the inlet of the tub 10 to prevent the washing water in the tub 10 from leaking out of the tub 10.

A driving unit for rotating the drum may be provided on the rear surface 10b 'of the tub 10. The drive motor may have a stator and a rotor for rotating the drum. The rotor generates rotational force by electromagnetic interaction with the stator. The rotor may be connected to the rear surface 10b 'of the drum through the rotating shaft to drive the drum. A rotating shaft support 10b1 may be formed on the rear surface 10b 'of the tub 10 so that the rotating shaft can pass therethrough.

The cabinet forms the outline and skeleton of the washing machine. Openings are formed on the front surface 10a 'of the cabinet for input of laundry objects. In addition, a door for opening and closing the opening may be rotatably installed.

A water supply hose is provided inside the cabinet. One side of the water supply hose is connected to the external water pipe through the external water supply hose and the other side is connected to the tub 10, the washing water may be supplied to the inside of the tub 10 along the water supply hose.

A drum may be rotatably provided inside the tub 10.

The drum is provided with a receiving space therein for injecting laundry objects. A plurality of through holes are formed in the drum, and the wash water of the tub 10 may flow into the drum through the through holes.

A plurality of lifters may be provided inside the drum. The lifter rotates together with the drum and lifts the laundry object inserted into the drum to the upper part of the drum, and taps the laundry object by using a drop of gravity.

Detergent input portion is provided in the cabinet, detergent may be stored in the detergent input portion. Detergent input unit is connected to the water supply hose, and after receiving the wash water from the outside to mix the wash water and the detergent may supply the detergent into the tub 10 together with the wash water.

A drain 10b2 is formed at the bottom of the tub 10 so that the contaminated washing water is discharged to the outside of the cabinet. The drain hose is formed so that one side is in communication with the drain port 10b2 and the other side is in communication with the outside of the cabinet to discharge the wash water to the outside of the cabinet.

A pump casing and a drain pump may be provided at the bottom of the tub 10. One side of the pump casing may be connected to the drain port 10b2 through a drain hose and the other side may be connected to the drain pump. The wash water discharged from the tub 10 may be pumped by the drainage pump and discharged to the outside of the cabinet through the drainage hose.

The tub 10 may be formed to be inclined upward toward the front of the cabinet so that the front surface 10a 'is positioned higher than the rear surface 10b'. The center line of rotation of the drum penetrating the longitudinal center of the tub 10 may be formed to be inclined at an angle with respect to the horizontal plane.

The tub 10 may be injection molded by the injection mold 20 using a polymer resin.

The tub 10 may be divided into two parts (TWO PARTS) along the circumferential surface for injection molding. For example, the tub 10 may be composed of a tub cover 10a disposed in front of the drum in the rotational axis direction and a tub body 10b disposed behind the tub cover 10a. Here, the front (forward direction) means the direction facing the front surface (10a ') of the cabinet in which the laundry opening is formed. The rear means a direction facing the rear surface 10b 'of the cabinet opposite to the inlet.

The tub cover 10a may form the front portion of the tub 10, and the tub body 10b may form the rear portion of the tub 10. The tub cover 10a forms a part of the front surface 10a 'and the circumferential surface of the tub 10, that is, the front circumferential surface in the longitudinal direction of the tub 10. The tub body 10b forms a part of the rear surface 10b 'of the tub 10 and a portion of the circumferential surface, that is, a circumferential surface of the rear side in the longitudinal direction of the tub 10.

The rear surface 10b 'of the tub cover 10a is opened toward the tub body 10b, and the front surface 10a' of the tub body 10b is opened toward the tub cover 10a, and the tub cover 10a is opened. ) And the tub body 10b may be in communication with each other. Flange-shaped coupling portions protrude from each other to face each other along the circumferential surface of the rear end of the tub cover 10a and the front end portion of the tub body 10b, and the coupling portion may be fastened by a fastening member such as a bolt. In addition, a sealing member is coupled between the rear face 10b 'of the tub cover 10a and the front face 10a' of the tub body 10b, thereby providing airtightness between the tub cover 10a and the tub body 10b. I can keep it.

Inlet is formed in the front surface (10a ') of the tub cover (10a). The laundry object is introduced into the drum through the inlet. The drum has an opening in the front face 10a 'so as to communicate with the inlet of the tub cover 10a. The inlet of the tub cover 10a may be formed smaller than the diameter of the tub cover 10a.

The sump 12 may be concave on the bottom surface of the tub body 10b. The sump 12 is located lower than the lowest end of the circumferential surface in the tub body 10b. As a result, the wash water in the tub 10 may flow into the sump 12 by gravity.

The sump 12 has a drain 10b2 on one side for draining the wash water to the outside. The drain port 10b2 may be connected to the drain hose described above to drain the wash water to the outside.

Figure 3a is a view showing a drop of water droplets (3) rolled from the lotus leaf (1), Figure 3b is a conceptual diagram for explaining the lotus leaf effect of the super water-repellent fine projections 13 applied to the washing machine according to the present invention, 3C is a conceptual diagram for explaining a correlation between a contact angle between water and a surface and a water repellent property.

As shown in FIG. 3A, the surface of the lotus leaf 1 has numerous hydrophobic nano-projections 2 (about one nanometer in diameter), so that water does not penetrate even if it rains. This condensation then flows down the surface. Thus, because of the hydrophobic protrusions lotus leaf (1) is not attached to the water droplets (3) will roll down. At this time, the dust and dirt attached to the fine protrusions also fall together, the lotus leaf (1) can always maintain a clean state. As described above, the lotus leaf effect includes the self-cleaning (maintaining cleanliness) effect of the lotus leaf 1 as well as the effect of the water droplet 3 rolling off and not getting wet.

The water droplet 3 shown in FIG. 3B has a small contact area when it comes in contact with the nano-projections 2 having a smaller size than the magnetic field, and the contact angle is greater than 100 °, so that the lotus leaf 1 has hydrophobicity. Due to this, the water droplets 3 do not penetrate between the microprojections but are floated on the microprojections and meet with other droplets 3 to form larger droplets 3, and the larger droplets 3 flow and become heavier, rolling down and falling down. .

The angle at which the water shown in FIG. 3C contacts the surface of the contact object is referred to as a contact angle, and exhibits hydrophilicity when the contact angle between the water and the surface is less than 90 °, and the water repellency when the contact angle is greater than 90 ° and less than 150 °. When the contact angle is more than 150 ° exhibits super water repellency.

In the present invention, by applying the super water-repellent micro-projections 13 where the water touches the inside of the washing machine, by using the lotus leaf (1) effect can improve the drainage inside the washing machine and remove the residual water in the washing machine.

4 is a view showing an example in which the super water-repellent micro-projections 13 according to the present invention are applied to the tub cover 10a, and FIG. 5 is the super water-repellent micro-projections 13 according to the present invention applied to the tub body 10b. The figure shows an example.

The super water-repellent fine protrusion 13 may be applied to the inner surface of the tub 10.

The super water-repellent fine protrusion 13 may be applied to the inner surface of the tub cover 10a or the tub body 10b.

4 shows a view of the front surface 10a 'in the tub cover 10a. The super water-repellent fine protrusions 13 may be integrally formed on the front surface 10a 'of the tub cover 10a of FIG. 4 so as to be covered by a predetermined pattern. Although not shown, the super water-repellent fine protrusions 13 may be formed on the inner circumferential surface of the tub cover 10a.

5 shows a view of the rear surface 10b 'in the tub body 10b. The super water-repellent fine protrusion 13 may be integrally formed on the rear surface 10b 'of the tub body 10b of FIG. 5 so as to be covered by a predetermined pattern. Although not shown, the super water-repellent micro-projections 13 may be formed on the inner circumferential surface of the tub body 10b.

The super water-repellent fine protrusion 13 has a size in the range of 0.2 mm to 0.4 mm in order to exert super water repellent performance with a contact angle between water and the surface of 150 ° or more. In addition, the super water-repellent fine protrusions 13 preferably have a size of 0.2 mm or less (or 0.25 mm or less). Because, when the size of the fine protrusions is larger than the upper limit of 0.25mm, foreign matter may be caught between the fine protrusions, it is preferable that the fine protrusions have a size of less than the upper limit in order to prevent the foreign matter caught.

When the super water-repellent micro-projections 13 cover the inner surface of the tub 10, when the water droplets 3 form on the surface of the tub 10, the water droplets 3 do not get wet on the surface of the tub 10 and are round balls. Roll along the microprojections while maintaining the shape of a sphere. The droplet 3 slides toward the sump 12 in the tub 10 by gravity. Here, the ball-shaped water droplets 3 do not touch the inner surface of the tub 10 by the super water-repellent micro-projections 13, and the super water-repellent micro-projections 13 support the water droplets 3. In addition, the water droplets 3 merge along with the other water droplets 3 while moving along the surface in the tub 10 to create a larger water droplet 3 and move to the sump 12 and the drain 10b2 by gravity to discharge to the outside. Will be.

As a result, since the residual water is drained without remaining in the tub 10, it is possible to keep the clean state inside the tub 10 clean.

In addition, since the droplet 3 is rolled and drained together with the foreign matter attached to the inside of the tub 10, a self-cleaning effect can also be obtained.

6a and 6b is a schematic view for explaining the manufacturing method of the tub 10 by the plastic injection mold according to the present invention, Figure 6a is a case in which the injection mold is closed and Figure 6b is an injection mold in the open state Shows.

Referring to Figure 6a, the injection mold is divided into a fixed part and a moving part. The first molding part 211 having the same shape as that of the outer surface of the tub cover 10a or the tub body 10b is provided inside the fixing part. The moving part is provided with a second molding part 221 having the same shape as the shape of the inner surface of the tub cover 10a or the tub body 10b on one outer side.

The first molding part 211 and the second molding part 221 may be formed to face each other, and the second molding part 221 may be inserted into the fixing part toward the first molding part 211. An injection molding machine is provided at one side of the fixing part, and the molten resin of the plastic is injected from the injection molding machine into the space between the first molding part 211 and the second molding part 221.

The micro-molding protrusion 23 is formed on the surface of the second molding part 221, and the super-water-repellent micro-projection 13 is injection molded integrally with the tub 10 by the micro-molding protrusion 23.

Referring to FIG. 6B, the micro molding protrusion 23 is formed on the right side of the moving part, but the second water repellent micro protrusion 13 is formed on the circumferential surface of the tub cover 10a or the tub body 10b. The fine molding protrusion 23 may be formed on the outer circumferential surface of the molding part 221.

After the injection molding is completed, the moving part is separated from the fixing part for taking out the injection product. The moving part may be separated in the longitudinal direction of the tub cover 10a or the tub body 10b. The longitudinal direction of the tub cover 10a or the tub body 10b means a direction parallel to the circumferential surface of the tub body 10b of the tub cover 10a.

Hereinafter, various embodiments of the super water-repellent fine protrusions 13 according to the present invention will be described.

Figure 7a is a schematic view showing a first embodiment of the super water-repellent micro-projections 13 according to the present invention, Figure 7b is a plan view of the super water-repellent micro-projections 13 of Figure 7a seen from above.

The super water-repellent fine protrusions 13 according to the first embodiment are formed in a brick (square) shape. The upper width and the lower width of the microprotrusions are the same, and the height of the microprotrusions may be half 2/10 of the size of the microprotrusions in comparison with the horizontal and vertical lengths 4/10.

In addition, the super water-repellent fine protrusions 13 may be spaced apart from each other by 1/10 size. The super water-repellent fine protrusions 13 may be spaced apart in two directions (two directions, a transverse direction and a longitudinal direction).

8A is a schematic view showing a second embodiment of the super water-repellent micro-projections 113 according to the present invention, and FIG. 8B is a plan view of the super water-repellent micro-projections 113 of FIG. 8A seen from above.

The super water-repellent fine protrusions 113 according to the second embodiment are formed in a brick (square) shape. The upper width and the lower width of the microprotrusions are the same, the width, length and height of the microprotrusions are all the same as 2/10, the microprotrusions may be formed spaced apart from each other by 5/100 size.

In addition, the super water-repellent fine protrusions 113 may be spaced apart in two directions.

9A is a schematic view showing a third embodiment of the super water-repellent micro-projection 213 according to the present invention, and FIG. 9B is a plan view of the super-water-repellent micro-projection 213 of FIG. 9A seen from above.

The super water-repellent fine protrusion 213 according to the third embodiment is formed in a convex upward shape. The round micro-projections may be formed without being spaced apart from each other in a continuous direction. At this time, the pitch between the fine protrusions may be made in the same ratio (5/100) in the horizontal and vertical directions, respectively. The gap between the depressions (valleys) between the fine protrusions may be formed in the same ratio in the horizontal and vertical directions.

10A is a schematic view showing a fourth embodiment of the super water-repellent micro-projection 313 according to the present invention, and FIG. 10B is a plan view of the super-water-repellent micro-projection 313 of FIG. 10A seen from above.

The super water-repellent fine protrusion 313 according to the fourth embodiment has a tip-shaped protrusion. A dent between the pointed bumps can be rounded down. Pointed protrusions and indentations can be formed alternately in succession.

At this time, the pitch between the sharp protrusions may be made in the same ratio (5/100) in the horizontal and vertical directions, respectively.

11A is a schematic view showing a fifth embodiment of the super water-repellent micro-projection 413 according to the present invention, and FIG. 11B is a plan view of the super-water-repellent micro-projection 413 of FIG. 11A seen from above.

The super water-repellent fine protrusion 413 according to the fifth embodiment may be formed in a trapezoidal shape. The trapezoidal microprojections have a narrow upper width compared to the lower width. For example, the upper width of the microprojections may be 1/10 and the lower width may be 3/10. And, the height of the microprojections can be longer than the upper width. For example, the height of the microprojections may be 2/10 and the upper width may be 1/10.

In addition, the trapezoidal fine protrusions 413 may be formed to be spaced apart in one direction.

12A is a schematic view showing a sixth embodiment of the super water-repellent micro-projections 513 according to the present invention, and FIG. 12B is a plan view of the super-water-repellent micro-projections 513 of FIG. 12A seen from above.

The super water-repellent fine protrusion 513 according to the sixth embodiment may be formed in a triangular or square pyramid shape. Square pyramidal micro-projections 513 have a pointed tip and forms four triangular surfaces along the circumferential surface. The height of the microprojections 513 may be 2/10, and the horizontal and vertical lengths of the bottom quadrangle may be 4/10.

13A is a schematic view showing a seventh embodiment of the super water-repellent micro-projections 613 according to the present invention, and FIG. 13B is a plan view of the super-water-repellent micro-projections 613 of FIG. 13A seen from above.

The super water-repellent fine protrusion 613 according to the seventh embodiment may be formed in the shape of a triangle or a square pyramid. However, the height of the fine protrusion 613 according to the seventh embodiment, the horizontal and vertical length of the bottom square may be the same at the ratio of 2/10.

As described above, the super water-repellent fine protrusion 613 may have one direction or two directions.

7A, 7B, 8A, 8B, 9A, 9B, 10A, 10B, 12A, 12B, 13A, and 13B except for FIGS. 11A and 11B, the fine protrusions 13, 113, 213, 313, 513, 613 are shown. It is bidirectional.

The fine protrusions 413 of FIGS. 11A and 11B have a unidirectional characteristic.

Here, the fine protrusions have a directionality means that the fine protrusions form a certain pattern in any direction.

For example, the fine protrusions 413 of FIGS. 11A and 11B protrude in a trapezoidal shape along one direction. The trapezoidal fine protrusions 413 may be formed to be spaced apart at regular intervals in a direction crossing the one direction.

In addition, the micro-projections 413 having one direction are spaced apart from each other in a direction intersecting with one direction, and the micro-projections 413 having one direction are symmetrically symmetrically with respect to the center line of the one direction spaced apart from each other in parallel. Can be formed. The center line in one direction refers to a line connecting the center of the upper width in the case of the trapezoidal protrusion 413. In addition, the first inclined surface 413a and the second inclined surface 413b may be symmetrically formed on both sides of the micro-projection 413 on the one-way center line. In addition, when the micro-projections 413 having one direction are triangular, the center line in one direction means a line connecting upper vertices.

Except for FIGS. 11A and 11B, the fine protrusions 13, 113, 213, 313, 513, and 613 of FIGS. 7A to 10B and 12A to 13B have bidirectionality. For example, the fine protrusions 13, 113, 213, 313, 513, and 613 of the remaining drawings may be formed in a predetermined pattern in two directions, that is, in the transverse direction and the longitudinal direction.

In addition, the micro-projections 13, 113, 213, 313, 513 and 613 are bidirectionally formed in a predetermined pattern in two directions, ie, the transverse direction and the longitudinal direction intersecting with each other, and the micro-projections 13, 113, 213, 313, 513 and 613 having bidirectionality are spaced apart in parallel to each other. It can be formed symmetrically with respect to the center line in the longitudinal direction. The transverse center line and the longitudinal center line may have a lattice shape.

The micro-projections 13, 113, 213, 313, 513, 613 having bidirectionality may further improve super water repellent performance compared to the micro-projections 413 having unidirectionality.

14 is a perspective view showing an example of the super water-repellent fine projections 130 according to the present invention applied to the circumferential surface (100a ') of the tub cover (100a), Figure 15 is a super water-repellent fine projections 130 according to the present invention It is a perspective view showing the example applied to the circumferential surface 100b 'of the tub body 100b.

The super water-repellent fine protrusion 130 may be applied to the inner surface of the tub 100 to improve the drainage of the wash water.

The super water-repellent fine protrusion 130 may be applied to the inner surface of the tub cover 100a or the tub body 100b.

14 shows the tub cover 100a viewed from the rear. The super water-repellent fine protrusions 130 are integrally formed on the circumferential surface 100a 'in the tub cover 100a illustrated in FIG. 14 so as to be covered by a predetermined pattern.

15 shows the tub body 100b viewed from the front. The super water-repellent fine protrusions 130 are integrally formed on the circumferential surface 100b 'in the tub body 100b shown in FIG. 15 so as to be covered by a predetermined pattern.

The super water-repellent micro-projections 130 have a size in the range of 0.2 mm to 0.4 mm in order to exhibit super water repellent performance with a contact angle θ between water and the surface of 150 ° or more. In addition, the super water-repellent fine protrusion 130 preferably has a size of 0.2mm or less (or 0.25mm or less). Because, when the size of the fine protrusions is larger than the upper limit of 0.25mm, foreign matter may be caught between the fine protrusions, it is preferable that the fine protrusions have a size of less than the upper limit in order to prevent the foreign matter caught.

When the super water-repellent micro-projections 130 cover the inner surface of the tub 100, when the water droplets 2 form on the surface of the tub 100, the water droplets 2 do not get wet on the surface of the tub 10 and are round balls or the like. Roll along the microprojections while maintaining the shape of a sphere. The droplet 2 slides toward the sump 120 in the tub 100 by gravity. Here, the ball-shaped water droplets 2 do not touch the inner surface of the tub 100 by the super water-repellent fine protrusions 13, and the super water-repellent fine protrusions 130 support the water droplets 2. Further, the water droplet 2 merges with other water droplets 2 while moving along the surface in the tub 100 to create a larger water droplet 2 and moves to the sump 120 and the drain hole 100b2 by gravity to drain the drain hose. Will be discharged to the outside.

As a result, since the residual water is drained without remaining in the tub 100, it is possible to keep the clean state inside the tub 100 clean.

In addition, since the water droplet 2 rolls down with the foreign matter on the inner surface of the tub 100, a self-cleaning effect can also be obtained.

Here, the super water-repellent fine protrusions 13 formed on the inner surface of the tub 100 may be integrally formed with the tub 100 by injection molding.

The super water-repellent fine protrusions 130 formed on the circumferential surfaces 100a 'and 100b' of the tub 100 may have directionality for smooth separation of the injection mold. That is, the super water-repellent fine protrusions 130 formed on the circumferential surfaces 100a 'and 100b' of the tub 100 have directivity in the direction in which the injection mold 200 is separated after molding. As the super water-repellent micro-projections 130 have a direction in a specific direction, it is possible to remove the undercut of the injection mold, that is, to prevent the smooth separation of the mold. In order to remove the undercut of the injection mold may be provided with a separate core, in this case there is a problem that the manufacturing cost increases.

In the present invention, the super water-repellent fine protrusion 130 can remove the undercut of the injection mold without a separate core because it has a direction in the direction in which the mold is separated, to prevent the physical performance degradation due to the undercut of the water repellent surface Can be.

In addition, the super water-repellent fine protrusions 130 formed on the circumferential surfaces 100a 'and 100b' of the tub 100 may be formed to have a slope having a predetermined slope to guide the residual flow in a constant direction.

16 is a schematic view showing the structure of the super water-repellent fine protrusions 130 according to the present invention has an asymmetric inclined surface.

The super water-repellent fine protrusions 130 may be formed of, for example, a right triangle in cross section. However, the cross-sectional shape is not limited to this.

Two super water-repellent micro-projections 130 shown in Figure 16 are formed adjacent to each other. The super water-repellent fine protrusion 130 may be composed of a first inclined surface 130a which is formed to be inclined downward in one direction from the upper vertex and a second inclined surface 130b which is inclined downward in the opposite direction from the upper vertex. The inclination (gradient) of the first inclined plane 130a (the right inclined plane based on the upper vertex in FIG. 6) is smaller than the inclination of the second inclined plane 130b (smooth). In the drawing, a vertical line passing through the upper vertex and a horizontal line positioned below the upper vertex meet and intersect, and the length of the horizontal extension line extending from the intersection of the vertical line and the horizontal line to the right vertex is called a, and the horizontal line extending from the intersection to the left vertex If the length of the extension line is b and the vertical extension line connecting the upper vertex and the intersection point is the height h, h / a is the slope of the first slope 130a, and h / b is the slope of the second slope 130b. .

The super water-repellent micro-projections 130 are asymmetrical with the first and second slopes 13b on both sides formed at different slopes (h / a < h / b) with respect to the upper vertex.

The super water-repellent fine protrusion 130 forms a contact angle θ of 150 degrees or more with the water droplet 2 and has super water repellency. In addition, the water droplets 2 may move in one direction with directionality in the super water-repellent micro-projections 130 due to the characteristics of the surface structure of the super water-repellent micro-projections 130 having an asymmetric inclined surface. That is, the flow of the water droplets 2 is made toward the first inclined surface 130a from the second inclined surface 130b of the super water-repellent fine protrusion 130.

Here, the first inclined surface 130a and the second inclined surface 130b of the super water-repellent fine protrusion 130 are formed such that the residual water formed on the circumferential surfaces 100a 'and 100b' of the tub 100 flows toward the sump 120. The tub 100 may be disposed alternately in the circumferential direction. The first inclined surface 130a is formed to be inclined downward toward the drain hole 100b2 or the sump 120 at the upper vertex of the microprotrusion, and the second inclined surface 13b is the drain port 100b2 or the sump 120 at the upper vertex of the microprotrusion. ) Is inclined downward in the opposite direction. However, the first slope 130a and the second slope 130b have different inclination angles, and the slope h / a of the first slope 130a is smaller than the slope h / b of the second slope 130b.

The motive force F which gives the directivity of the water droplet 2 consists of a following formula.

r _lv : surface tension of water, θ _A : forward angle of water, θ _B : backward angle of water, w ₁ : angle of right vertex, w ₂ : angle of left vertex

Figure 17a and 17b is a schematic view for explaining the manufacturing method of the tub by the plastic injection mold according to the present invention, Figure 17a is a case in which the injection mold is closed and Figure 17b shows a case in which the injection mold is open. FIG. 17C is a side view illustrating a state viewed from the D-D direction of FIG. 17B.

Referring to Figure 17a, the injection mold is divided into a fixed part and a moving part. The first molding part 211 having the same shape as the shape of the outer surface of the tub cover 100a or the tub body 100b is provided inside the fixing part. The moving part is provided with a second molding part 2201 having the same shape as the shape of the inner surface of the tub cover 100a or the tub body 100b on one outer side.

The first molding part 2101 and the second molding part 2201 may be formed to face each other, and the second molding part 2201 may be inserted into the fixing part toward the first molding part 2101. An injection molding machine is provided at one side of the fixing part, and molten resin of the plastic is injected from the injection molding machine into the space between the first molding part 2101 and the second molding part 2201.

The micro molding protrusion 230 is formed on the surface of the second molding part 2201, and the super water-repellent micro protrusion 130 is injection molded integrally with the tub 100 by the micro forming protrusion 230.

Referring to FIG. 17B, a fine molding protrusion 230 is formed on the circumferential surface of the moving part. As a result, the super water-repellent fine protrusions 130 may be injection molded on the circumferential surfaces 10a 'and 10b' in the tub cover 100a or the tub body 100b.

After the injection molding is completed, the moving part is separated from the fixing part for taking out the injection product. The moving part may be separated in the longitudinal direction of the tub cover 100a or the tub body 100b. The longitudinal direction of the tub cover 100a or the tub body 100b means a direction parallel to the circumferential surface 100b 'of the tub body 100b of the tub cover 100a.

The super water-repellent fine protrusions 130 formed on the circumferential surfaces 100a 'and 100b' of the tub cover 100a or the tub body 100b have a moving part or a moving mold 220 from the fixed part after injection molding is completed. Directional in the direction of separation.

Here, the super water-repellent micro-projections 130 have a directionality means that when the mold is separated after the molding is completed by the injection mold 200, the super-water-repellent micro-projections 130 are fine molding protrusions of the moving mold 220 ( It means that the super water-repellent fine protrusions 130 protrude along the separation direction of the moving mold 220 so as not to interfere with the 230.

FIG. 18A is a partially enlarged view of “C” in FIG. 14, which is a plan view showing an example of the super water-repellent microprojections 130 having a directivity, and FIG. 18B is a super water-repellent microprojections 1310 seen in the EE direction of FIG. 18A. This is a cross-sectional view showing the cross-sectional shape of.

The separation direction of the moving mold 220 may be a longitudinal direction of the tub 100. For example, the movable mold 220 is separated or removed from the stationary mold 210 along the longitudinal center line of the tub cover 100a from the front surface of the tub cover 100a toward the rear opening.

The super water-repellent fine protrusion 1310 may have a direction in the longitudinal direction of the tub 100, the longitudinal direction of the tub cover 100a, or the longitudinal direction of the tub body 100b. In addition, the super water-repellent fine protrusions 130 may include the circumferential surfaces 100a 'and 100b' of the tub 100, the circumferential surface 100a 'of the tub cover 100a, or the circumferential surface 100b' of the tub body 100b. It may have a direction in the direction parallel to).

The super water-repellent fine protrusion 1310 has a tub cover 100a or a tub body (1) in order to have a direction in the separation direction of the mold, that is, the longitudinal direction of the tub 100, the tub cover 100a or the tub body 100b. It has a constant cross-sectional shape along the longitudinal direction of 100b).

The super water-repellent fine protrusion 1310 illustrated in FIG. 18A has a triangular cross-sectional shape. The super water-repellent fine protrusion 1310 is formed such that the triangular cross-sectional shape is constantly maintained along the longitudinal direction of the tub cover 100a or the tub body 100b. In particular, the super water-repellent micro-projections 130 may form a straight line with the vertices of the triangle continuously connected along the longitudinal direction of the tub (100). Both sides of the triangle may be formed symmetrically with both sides having the same length and angle of inclination with respect to a vertex or a straight line extending from the vertex. Both sides of the super water-repellent micro-projections 1310 are symmetric with each other and have the same length and inclined surfaces. The super water-repellent fine protrusion 1310 may have a cross-sectional shape of an isosceles triangle. At this time, the base side (P) and the height (h) of the isosceles triangle may be the same length.

In addition, the plurality of super water-repellent micro-projections 1310 may be formed in the shape of a triangular cross-section continuously adjacent to each other in the circumferential direction of the tub 100 or spaced apart at regular intervals. The plurality of super water-repellent fine protrusions 1310 shown in FIG. 18A are continuously formed adjacent to each other. Continuously adjacently formed means that the inclined surfaces of the two adjacent fine protrusions face each other to form a straight valley.

19A is a plan view showing another example of the super water-repellent micro-projections 2310 having a directionality according to the present invention, and FIG. 19B is a cross-sectional view showing the cross-sectional shape of the super water-repellent micro-projections 2310 of FIG. 19A.

The super water-repellent microprojections 2310 illustrated in FIGS. 19A and 19B have the following differences as compared to the super water-repellent microprojections 1310 of FIGS. 18A and 18B, and the remaining components are superhydrophobic microstructures of FIGS. 18A and 18B. Since it is the same as or similar to the projection 1310, detailed description thereof will be omitted.

The super water-repellent microprojections 2310 illustrated in FIGS. 19A and 19B may have a trapezoidal shape.

The upper side w and the lower side P of the trapezoid may be made parallel to each other. In addition, the upper side (w) may have a length of about 1/3 of the lower side (P). An inclined surface symmetrical with each other may be formed on both sides with respect to the center line of the upper side w of the trapezoid. When the trapezoid is viewed from above, the width P of the trapezoid (including the upper surface and both inclined surfaces) may be 3/2 of the height h of the trapezoidal cross section.

The super water-repellent fine protrusion 2310 may be constantly maintained along the longitudinal direction of the tub 100 so that the cross-sectional shape of the trapezoid has a constant direction in the separation direction of the mold, that is, the longitudinal direction of the tub 100.

In addition, the super water-repellent micro-projections 2310 may be formed in a trapezoidal cross-sectional shape spaced apart in the circumferential direction of the tub 100 or continuously. The super water-repellent fine protrusions 2310 illustrated in FIG. 9B are formed to be spaced apart in the circumferential direction of the tub 100.

20 is a front view of the tub 200 according to the present invention seen from the front, and FIG. 21 is a sectional view taken along the line I-I of FIG. 20.

The upper part of the sump 210 is opened to communicate with the inside of the tub body 200b, and the wash water in the tub body 200b flows down and collects into the sump 210.

An overflow preventing member 210a may be provided at an upper side edge portion of the sump 210. Overflow prevention member (210a) is due to the acceleration of the washing water flowing along one side circumferential surface of the tub body (200b) wash water is introduced into the sump 210 and at the same time a part of the wash water in the sump (210) Is to prevent it from flowing over the opposite circumferential surface of the tub 200 through the sump 210. To this end, the overflow preventing member 210a may be formed to protrude along the longitudinal direction of the sump 210 at the side edge portion of the sump 210.

The overflow preventing member 210a may be formed to protrude in a direction facing toward each other at the upper end of both sides of the sump 210.

The sump 210 may be formed to be wider toward the front from the rear surface of the tub body 200b. In addition, the overflow preventing member 210a may be formed to be wider from the rear surface of the tub body 200b toward the front. However, the overflow prevention member positioned at the upper portion of the drain port 10b2 of the two overflow preventing members 210a may be partially cut to not cover the upper part of the drain port 200b2.

The sump 210 is provided with a drain 200b2 at one side to drain the wash water stored in the tub 200 to the outside. The drain 200b2 may be connected to the drain hose described above to drain the wash water to the outside.

The drain port 200b2 may be formed to be spaced apart from the longitudinal center line G-G of the tub 200 or the rotation center line of the drum at the sump 210 toward one side, for example, toward the right side panel of the cabinet.

The sump 210 may be formed to be biased toward one side, for example, to the right side panel of the cabinet from the longitudinal center line G-G of the tub 200 or the rotation center line of the drum at the lower portion of the tub body 200b. That is, the longitudinal center line of the sump 210 does not coincide with the longitudinal center line G-G of the tub body 200b and is spaced apart in one direction.

The drain hole 200b2 is formed to be spaced apart from the longitudinal center line of the sump 210 in one direction.

FIG. 22A is a cross-sectional view taken along line G-G showing an example of the sump 210 in FIG. 21, and FIG. 22B is a perspective view showing a super water-repellent fine protrusion 2130 applied to the sump 210 of FIG. 22A.

The tub cover 200a illustrated in FIG. 22A is disposed at the front in the longitudinal direction of the tub 200, and the tub body 200b is disposed at the rear of the tub 200, and the tub cover 200a and the tub body 200b. ) Are combined with each other. The front face of the tub cover 200a is located higher than the rear face of the tub body 200b. An inlet for laundry is formed on the front surface of the tub cover 200a.

The tub cover 200a may be formed to be inclined downward in the 5 ° to 15 ° angle range β from the front surface to the rear. That is, the rear surface of the tub cover 200a may be located lower than the front surface thereof.

The tub body 200b may be inclined upward from the rear surface toward the front. That is, the front face of the tub body 200b is located higher than the rear face thereof.

However, the sump 210 may be inclined downward from the rear surface of the tub body 200b toward the front. The front bottom of the sump 210 is located lower than its rear bottom. The reason is that the drain port 200b2 is formed to be spaced forward from the rear surface of the tub body 200b, and the washing water in the sump 210 flows to the drain port 200b2.

For example, the bottom of the sump 210 may be formed to be inclined at an angle range of 0.5 to 1 ° with respect to the horizontal plane.

A plurality of super water-repellent fine protrusions 2130 are integrally formed on the inner surface of the tub 200 to remove residual water in the tub 200.

The super water-repellent fine protrusion 2130 has a size in the range of 0.2 mm to 0.4 mm in order to exert super water repellent performance with a contact angle between water and the surface of 150 ° or more. In addition, the super water-repellent fine projections 2130 preferably have a size of 0.2 mm or less (or 0.25 mm or less). Because, when the size of the fine protrusions is larger than the upper limit of 0.25mm, foreign matter may be caught between the fine protrusions, it is preferable that the fine protrusions have a size of less than the upper limit in order to prevent the foreign matter caught.

When the super water-repellent micro-projections 2130 cover the inner surface of the tub 200, when the water droplets 3 form on the surface of the tub 200, the water droplets 3 do not get wet on the surface of the tub 200 and are round balls. Roll along the microprojections while maintaining the shape of a sphere. The droplet 3 slides toward the sump 210 in the tub 200 by gravity. Here, the ball-shaped water droplets 3 do not touch the inner surface of the tub 200 by the super water-repellent fine protrusions 2130, and the super water-repellent fine protrusions 2130 support the water droplets 3. In addition, the water droplets 3 merge with other water droplets 3 while moving along the surface in the tub 200 to form a larger water droplet 3 and move to the sump 210 and the drain hole 200b2 by gravity to move the drain hose. Will be discharged to the outside.

As a result, since the residual water is drained without remaining in the tub 200, the clean state of the inside of the tub 200 can be kept clean.

In particular, the plurality of super water-repellent fine protrusions 2130 may be formed on the inner surface of the sump 210.

As a result, the droplets 3 in the sump 210 roll down along the super water-repellent fine protrusion 2130 to form a large droplet 3 and move to the drain hole 200b2.

In addition, since the water droplets 3 roll down together with the foreign matter on the inner surface of the sump 210, a self-cleaning effect can also be obtained.

FIG. 23A is a perspective view illustrating another example of the sump 2110 in FIG. 21, FIG. 23B is a plan view of the sump 2110 of FIG. 23A, and FIG. 23C is a cross-sectional view of the residual water in FIG. 23A.

The sump 2110 shown in FIGS. 23A-23C differs from the sump 210 of FIGS. 22A and 22B as follows. Since the rest of the configuration is the same as or similar to FIGS. 22A and 22B, a detailed description thereof will be omitted.

The sump 2110 illustrated in FIGS. 23A to 23C further includes a residual water guide flow path 220.

Residual water guide flow path 220 is provided to guide the residual water in the sump (2110) to the drain (200b2). Residual guide flow path 220 is formed to be spaced apart in one direction from the longitudinal center line of the sump (2110). The residual water guide flow path 220 has a narrow flow path and is formed long in the longitudinal direction of the sump 2110.

In addition, the residual water guide flow path 220 is formed to be inclined downward toward the front portion from the rear portion of the sump (2110). Because the drain port 200b2 is formed at the front end of the residual water guide flow path 220, the front end of the residual water guide flow path 220 is lower than the rear end so that the residual water flows to the drain port 200b2 under the influence of gravity. Preferably located. Here, the residual water guide flow path 220 has a larger inclination than the bottom of the sump (210). For example, the inclination angle of the bottom surface of the sump 2110 may be 0.5 ° to 1 ° while the inclination angle of the residual guide flow path 220 may be formed within a range of 2 ° to °°.

As a result, the residual water guide passage part 220 may further improve the drainage of the residual water to the drain hole 200b2 than the residual water in the sump 2110.

In order to more effectively remove the residual water in the sump 2110, the super water-repellent fine protrusions 2130 formed in the sump 2110 may be formed to have a slope having a predetermined slope to guide the residual flow in a constant direction.

For example, the super water-repellent micro-projections 2130 of the sump 2110 may induce residual water to flow toward the residual water guide passage 220.

Here, the first inclined surface and the second inclined surface of the super water-repellent fine protrusion 2130 may flow in the width direction of the sump 2110 so that the residual water in the sump 2110 flows toward the residual water guide flow path 220 or the drain 200b2. Alternately to 200b2 or the residual water guide flow path 220 may be disposed. The first inclined surface is formed to be inclined downward toward the drain port 200b2 or the residual water guide passage 220 at the upper end of the fine protrusion, and the second slope is the drain hole 200b2 or the residual water guide passage at the upper point of the fine protrusion 2130. It is formed to be inclined downward in the opposite direction to the portion 220. However, the first slope and the second slope have different inclination angles, and the slope h / a of the first slope is smaller than the slope h / b of the second slope.

24A and 24B are schematic views for explaining a manufacturing method of the tub 200 by the plastic injection mold according to the present invention, and FIG. 24A is a case where the injection mold is in a closed state and FIG. 24B is when the injection mold is in an open state. Shows. 24C is a side view of the I-I direction of FIG. 24B.

Referring to Figure 24a, the injection mold is divided into a fixed part and a moving part. The first molding part 3110 having the same shape as that of the outer surface of the tub cover 200a or the tub body 200b is provided inside the fixing part. The moving part is provided with a second molding part 3210 having the same shape as the shape of the inner surface of the tub cover 200a or the tub body 200b on one outer side.

The first molding part 3110 and the second molding part 3210 may be formed to face each other, and the second molding part 3210 may be inserted into the fixing part toward the first molding part 3110. An injection molding machine is provided at one side of the fixing part, and molten resin of the plastic is injected from the injection molding machine into the space between the first molding part 3110 and the second molding part 3210.

The micro molding protrusion 330 is formed on the surface of the second molding part 3210, and the super water-repellent micro protrusions 2130 are integrally injection-molded together with the tub 200 by the micro forming protrusions 330.

Referring to FIG. 24C, a fine molding protrusion 330 is formed at the lower portion of the circumferential surface of the moving part (the part facing the sump 2110). As a result, the super water-repellent fine protrusions 2130 may be injection molded to the sump 2110 in the tub body 200b.

After the injection molding is completed, the moving part is separated from the fixing part for taking out the injection product. The moving part may be separated in the longitudinal direction of the tub cover 200a or the tub body 200b. The longitudinal direction of the tub cover 200a or the tub body 200b means a direction parallel to the circumferential surface of the tub body 200b of the tub cover 200a.

The super water-repellent fine protrusions 2130 formed on the inner surface of the sump 2110 of the tub body 200b have a direction in a direction in which the moving part or the moving mold 320 is separated from the fixing part after injection molding is completed.

Here, the super water-repellent micro-projections 2130 have a directionality is that when the mold is separated after the molding is completed by the injection mold 300, the super-water-repellent micro-projections 2130 are fine molding projections of the moving mold 320 ( This means that the super water-repellent fine protrusions 2130 protrude along the separation direction of the moving mold 320 so as not to interfere with the 330 (see FIGS. 22B and 23B).

FIG. 25A is an enlarged view of part “X” of FIG. 22B, which is a plan view showing an example of super water-repellent microprojections 2130 having directionality, and FIG. 25B is a super water-repellent microprojections 2130 viewed in the JJ direction of FIG. 25A. This is a cross-sectional view showing the cross-sectional shape of.

The separation direction of the moving mold 320 may be a longitudinal direction of the tub 200. For example, the moving mold 320 is separated or removed from the stationary mold 310 along the longitudinal center line of the tub cover 200a from the front face of the tub cover 200a toward the rear opening.

The super water-repellent fine protrusion 2130 may have a direction in the longitudinal direction of the tub 200, the longitudinal direction of the tub cover 200a, the longitudinal direction of the tub body 200b, or the longitudinal direction of the sump 2110. In addition, the super water-repellent fine projections 2130 are directional in a direction parallel to the circumferential surface of the tub 200, the circumferential surface of the tub cover 200a, the circumferential surface of the tub body 200b, or the inner surface of the sump 2110. Can have

The super water-repellent fine protrusion 2130 is a tub to have a direction in the separation direction of the mold, that is, the longitudinal direction of the tub 200, the tub cover 200a and the tub body 200b or the longitudinal direction of the sump 2110 It has a constant cross-sectional shape along the longitudinal direction of the cover 200a or the tub body 200b or the longitudinal direction of the sump 2110.

The super water-repellent fine protrusions 2130 illustrated in FIG. 25A have a triangular cross-sectional shape. The super water-repellent fine protrusion 2130 is formed such that the triangular cross-sectional shape is constantly maintained along the longitudinal direction of the tub cover 200a or the tub body 200b or the longitudinal direction of the sump 2110. In particular, the super water-repellent micro-projections 2130 may be formed in a straight line by connecting the vertices of the triangle in the longitudinal direction of the tub 200 or in the longitudinal direction of the sump 2110. Both sides of the triangle may be formed symmetrically with both sides having the same length and angle of inclination with respect to a vertex or a straight line extending from the vertex. Both sides of the super water-repellent micro-projections 2130 are symmetric with each other and have the same length and inclined surfaces. The super water-repellent fine protrusions 2130 may have a cross-sectional shape of an isosceles triangle. At this time, the base p and the height h of the isosceles triangle may be the same length.

In addition, the plurality of super water-repellent micro-projections 2130 may be formed to be adjacent to each other in the circumferential direction of the tub 200 or in the width direction of the sump 2110 continuously or spaced apart at regular intervals. The plurality of super water-repellent fine protrusions 2130 shown in FIG. 25A are continuously formed adjacent to each other. Continuously adjacently formed means that the inclined surfaces of the two adjacent fine protrusions face each other to form a straight valley.

Figure 26a is a plan view showing another example of the super water-repellent fine projections 3130 having a direction according to the present invention, Figure 26b is a cross-sectional view showing the cross-sectional shape of the super water-repellent fine projections 3130 in the KK direction of Figure 26a. .

The super water-repellent fine protrusions 3130 shown in FIGS. 26A and 26B have the following differences, and the rest of the components are the same as or similar to those of the super water-repellent fine protrusions 3130 of FIGS. 25A and 25B, and thus, detailed descriptions thereof will be omitted. Shall be.

The super water-repellent fine protrusions 3130 illustrated in FIGS. 26A and 26B may have a trapezoidal shape.

The upper side w and the lower side p of the trapezoid may be parallel to each other. In addition, the upper side (w) may have a length of about 1/3 of the lower side (p). An inclined surface symmetrical with each other may be formed on both sides with respect to the center line of the upper side w of the trapezoid. When the trapezoid is viewed from above, the width of the trapezoid (including the upper surface and both inclined surfaces) may be 3/2 of the height h of the trapezoidal cross section.

The super water-repellent fine protrusion 3130 may be constantly maintained along the longitudinal direction of the tub 200 so that the cross-sectional shape of the trapezoid has a direction in the separation direction of the mold, that is, the longitudinal direction of the tub 200.

In addition, the super water-repellent fine protrusions 3130 may be formed in a trapezoidal cross-sectional shape spaced apart in the circumferential direction of the tub 200 or continuously formed. The super water-repellent fine protrusion 3130 illustrated in FIG. 26B is spaced apart from the circumferential direction of the tub 200 or the width direction of the sump 2110.

Therefore, according to the present invention, the remaining water inside the washing machine can be removed by using the lotus leaf effect of the super water-repellent micro-projections to keep the inside of the washing machine clean. For example, it is possible to remove the smell of the mold caused by the residual water.

In addition, the super water-repellent fine protrusion is formed to have a directional direction in a predetermined direction, that is, the separation direction of the mold can be prevented the occurrence of undercut during separation of the mold after injection molding.

In addition, by forming an asymmetrical gradient on both inclined surfaces of the super water-repellent micro-projections so that water falling along the super water-repellent micro-projections flows in a constant direction, the residual water in the tub may flow down the circumferential surface toward the drain hole.

The washing machine described above is not limited to the configuration and method of the above-described embodiments, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications can be made.

Claims (20)

1. A tub provided inside the cabinet and storing the washing water therein; And

   A plurality of super water-repellent fine protrusions formed on an inner surface of the tub to remove residual water in the tub;

   Washing machine comprising a.
2. The method of claim 1,

   The plurality of super water-repellent fine projections,

   Washing machine, characterized in that the injection molded by the injection mold together with the tub, integral with the inner surface of the tub.
3. The method of claim 2,

   The tub,

   An inlet for inserting a laundry object is formed on the front face, and the tub cover forms a front part of the tub when the tub is divided into a front part and a rear part along a circumferential surface; And

   A tub body coupled to a rear end of the tub cover and forming a rear portion of the tub;

   Washing machine comprising a.
4. The method of claim 3,

   The plurality of super water-repellent fine projections,

   Washing machine, characterized in that formed on the front surface in the tub cover and the rear surface in the tub body.
5. The method of claim 1,

   Each of the plurality of super water-repellent micro-projections, the upper width is smaller than or equal to the lower width washing machine.
6. The method of claim 1,

   The plurality of super water-repellent micro-projections each of which is made of any one of a round shape, triangle and square.
7. The method of claim 1,

   The plurality of super water-repellent fine projections are formed on both sides of the washing machine, characterized in that the two sides are formed symmetrically with respect to the center line in one direction spaced parallel to each other along the inner surface of the tub.
8. The method of claim 1,

   The plurality of super water-repellent fine projections are symmetrical on both sides of a first direction center line spaced in parallel with each other along the inner surface of the tub and a second direction center line spaced in parallel in a direction crossing the first direction center line. Washing machine characterized in that it is formed.
9. The method of claim 8,

   And the first direction center line and the second direction center line have a lattice shape.
10. The method of claim 1,

    The plurality of super water-repellent fine protrusions are formed on the circumferential surface of the tub.
11. The method of claim 10,

    The plurality of super water-repellent fine protrusions are formed to protrude along the longitudinal direction of the tub in the direction in which the injection mold is separated to prevent undercut of the injection mold after injection molding.
12. The method of claim 10,

    The plurality of super water-repellent fine projections, characterized in that spaced apart from each other in the circumferential direction of the tub.
13. The method of claim 1,

    The plurality of super water-repellent fine projections,

    Washing machine, characterized in that both sides are formed symmetrically based on the longitudinal center line of the circumferential surface spaced apart from each other in parallel with the circumferential surface of the tub.
14. The method of claim 10,

    The plurality of super water-repellent fine projections,

    Washing machine characterized in that both sides are formed asymmetrically with respect to the longitudinal center line of the circumferential surface spaced apart from each other along the circumferential surface of the tub so that the residual water in the tub flows in the circumferential direction.
15. The method of claim 1,

    A sump formed on a bottom surface of the tub, the sump having a drain hole for discharging the washing water in the tub to the outside;

    The plurality of super water-repellent fine protrusions are formed on the surface of the sump.
16. The method of claim 15,

    The sump is concave in the longitudinal direction of the tub toward the front surface of the tub at the lower end of the rear surface of the tub,

    The plurality of super water-repellent fine protrusions are formed to protrude along the longitudinal direction of the sump in the direction in which the injection mold is separated in order to prevent the undercut of the injection mold after injection molding.
17. The method of claim 15,

    The sump is formed at a position lower than the circumferential surface of the tub, washing machine characterized in that the inclined downward toward the front surface of the tub.
18. The method of claim 15,

    The drain is a washing machine, characterized in that formed in one direction away from the longitudinal center line of the sump.
19. The method of claim 15,

    The sump,

    One side is in communication with the drain, the washing machine further comprises a residual water flow guide portion formed to be spaced apart from the longitudinal center line of the sump to guide the remaining water in the sump to the drain.
20. The method of claim 19,

    The plurality of super water-repellent fine projections,

    Both sides are formed asymmetrically with respect to the longitudinal center line of the sump spaced parallel to each other along the bottom surface of the sump so that the residual water in the sump flows toward the residual water guide flow path, and the slope toward one side of the sump flows toward the residual water guide flow path. Washing machine comprising a small first inclined surface portion and the second inclined surface portion having a relatively large inclination on the other side facing in the opposite direction to the residual water guide passage portion.

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