KR102554904B1 - Gasket for washing machine and method of manufacturing gasket - Google Patents

Abstract

The gasket manufacturing method of the present invention is applied to a washing machine in which a casing having a laundry input port formed on the front side and a water storage tank having an opening formed on the front side are disposed at the rear of the front side, and the gasket is interposed between the front side of the casing and the water storage tank. and extending from the front end of the annular shape to the rear end of the annular shape to form a tubular passage connecting the laundry inlet and the opening, wherein the gasket extends from the rear end of the annular shape outward along a radial direction. A resin in a molten state is injected by an injection machine into a cavity including an extended tab and corresponding to the gasket formed by the mold, and the resin is injected through a gate connected to a portion corresponding to the tab.

Description

Gasket for washing machine and its manufacturing method {GASKET FOR WASHING MACHINE AND METHOD OF MANUFACTURING GASKET}

The present invention relates to a gasket applied to a front loading washing machine and a manufacturing method thereof.

In general, a washing machine is a device that separates contaminants from clothing, bedding, etc. (hereinafter abbreviated as 'laundry') by using chemical decomposition of water and detergent and physical action such as friction between water and laundry. is to refer to

In this washing machine, a laundry inlet is formed on the front of the casing, a water storage tank having an opening communicating with the laundry inlet is suspended inside the casing, and a washing tub is rotatably provided in the water storage tank.

An annular gasket forming a passage connecting the laundry inlet to the opening is installed between the casing and the water storage tank. The gasket is made of a soft material such as rubber and is elastically deformed in response to vibration of the water reservoir.

Conventionally, a gasket is formed using a compression mold, but this method has a problem in that a molding cycle is prolonged and productivity is lowered due to a long molding cycle and high consumption of raw materials because a finishing operation to remove unfinished parts after compression molding is essential.

The problem to be solved by the present invention is, first, to provide a method for manufacturing a gasket by injection molding and a gasket manufactured by the method.

Second, it is to reduce the amount of wasted raw materials to provide a gasket that lowers the unit price of the product.

Third, it is to provide a gasket manufacturing method with improved productivity by shortening the manufacturing cycle.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention relates to a gasket applied to a washing machine in which a casing having a laundry input port formed on the front side and a water storage tank having an opening formed on the front side are disposed behind the front side, and a manufacturing method thereof.

The gasket is interposed between the front portion of the casing and the water storage tank, and extends from a front end of the annular shape to a rear end of the annular shape to form a tubular passage connecting the laundry inlet and the opening.

The gasket includes a tab extending outward along a radial direction from a rear edge of the annular shape, and resin in a molten state is injected by an injection molding machine into a mold cavity corresponding to the gasket formed by a mold. However, resin is injected through a gate connected to a portion corresponding to the tab.

The tab may have a thickness defined in the front-back direction and have a plate-like shape protruding radially from the rear end of the annular shape with a length greater than the thickness. The resin may be injected in the thickness direction of the tab.

A plurality of the tabs may be formed on the rear end of the annular shape. The resin may be injected into each part of the cavity corresponding to the plurality of tabs.

The gasket may have a wire winding groove formed at an outer circumferential surface of the gasket extending forward from the rear end of the annular shape to form an annular shape and in which a wire binding the gasket and the reservoir is wound. there is.

Details of other embodiments are included in the detailed description and drawings.

The gasket manufacturing method of the present invention has an effect of reducing the cost of a product by reducing waste of raw materials compared to the conventional compression molding method.

In addition, there is an effect of improving productivity by shortening the manufacturing cycle compared to the prior art.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a washing machine according to an embodiment of the present invention.
2 is a side cross-sectional view of the washing machine shown in FIG. 1;
FIG. 3 is a front view, FIG. 4 is a rear view, and FIG. 5 is a perspective view of the gasket shown in FIG. 2 .
FIG. 6 is a cross-sectional view taken along line AA indicated in FIG. 5 .
FIG. 7 is a cross-sectional view taken along line BB indicated in FIG. 5 .

1 is a perspective view of a washing machine according to an embodiment of the present invention. 2 is a side cross-sectional view of the washing machine shown in FIG. 1; FIG. 3 is a front view, FIG. 4 is a rear view, and FIG. 5 is a perspective view of the gasket shown in FIG. 2 . 6 is a cross-sectional view taken along line A-A in FIG. 5; FIG. 7 is a cross-sectional view taken along line BB indicated in FIG. 5 .

1 to 7, a washing machine according to an embodiment of the present invention includes a casing 10 forming an exterior, a water storage tank 30 disposed in the casing 10 and storing wash water, and a water storage tank 30. It includes a washing tub 40 installed to be rotatable therein and into which laundry is put, and a motor 50 rotating the washing tub 40.

A front portion 11 having a laundry input port 12 is disposed on the front surface of the casing 10, and a door 20 for opening and closing the laundry input port 12 is rotatably connected to the front portion 11. In addition, a dispenser 14 into which detergent is injected may be installed on the front part 11 . A control panel 13 may be provided on the upper side of the front part 11 to receive various control commands from a user to control the operation of the washing machine.

A water supply valve 15, a water supply pipe 16, and a water supply hose 17 may be installed inside the casing 10. When water is supplied, wash water passing through the water supply valve 15 and the water supply pipe 16 is mixed with detergent in the dispenser 14 and then supplied to the water storage tank 30 through the water supply hose 17 .

The pump 70 and the reservoir 30 may be connected through a discharge hose 72 . In addition, the pump 70 may be connected to the drain pipe 74 through a drain port (not shown) to discharge wash water to the outside through the drain pipe 74 .

The pump 70 may also serve as a circulation function. The pump 70 may be connected to a circulation port (not shown) circulating pipe 19 . At least one valve may be provided to selectively guide the water pumped by the pump 70 to the drain port or the circulation port.

However, it is not limited to this, and according to the embodiment, water is discharged through the drain port when the impeller of the pump 70 rotates in the forward direction, and water is discharged through the circulation port when rotated in the reverse direction. It may be, and since this technology is already known, a detailed description thereof will be omitted.

Furthermore, the pump 70 is dedicated only to drainage, and a separate pump dedicated to circulation may be further provided.

An opening (not marked) is formed on the front surface 31 of the water tank 30 to correspond to the laundry inlet 12 formed on the front surface 11 . A gasket 60 may be disposed between an edge of the laundry inlet 12 of the front part 11 and an edge of the water tank 30 forming the opening. The gasket 60 may be formed of a flexible material such as rubber. The gasket 60 may be made of a material such as Ethylene Propylene Diene Monomer (EPDM) or Thermo Plastic Elastomer (TPE). The gasket 60 extends from the annular front end 62 to the annular rear end 61 to form a tubular passage 60p connecting the laundry inlet 12 and the opening of the water storage tank 30 .

The gasket 60 has a front end connected to the rim of the laundry inlet 12 of the front part 11 and a rear end connected to the rim of the opening of the water reservoir 30 to seal the gap between the water tank 30 and the front part 11. do. When the door 20 is closed, the door 20 and the front end of the gasket 60 come into close contact to seal the space between the door 20 and the gasket 60, thereby preventing leakage of wash water.

The gasket 60 includes tabs 63a, 63b, 63c, 63d, 63e, and 63f extending radially outward from the rear end 61 of the annular shape. The gasket 60 is formed by injection molding, and the resin injected from the injection molding machine 90 is injected into the cavity of the mold through the tabs 63a, 63b, 63c, 63d, 63e, and 63f. Therefore, after the mold is opened, protrusions corresponding to gates (hereinafter referred to as "gate protrusions") are formed on the tabs 63a, 63b, 63c, 63d, 63e, and 63f of the molded product taken out. has been The gate protrusion 67 may be formed on the back surface 631 of the tabs 63a, 63b, 63c, 63d, 63e, and 63f.

The gate protrusion 67 can be removed by post-processing, and therefore, traces of the removal of the gate protrusion 67 remain on the tabs 63a, 63b, 63c, 63d, 63e, and 63f in the final product that has undergone post-processing.

A cavity (not shown) having a shape corresponding to the gasket 60 is formed by molds 101, 102, 103, 104, 105, 106, 107, 108, and 109, and is melted into the cavity by an injection machine 90. of resin is injected. At this time, the resin is injected through a gate 110 connected to a portion corresponding to the tabs 63a, 63b, 63c, 63d, 63e, and 63f in the cavity.

A plurality of tabs 63a, 63b, 63c, 63d, 63e, and 63f may be provided, and a gate ( 110) can be connected. The resin injected from one injection molding machine 90 is guided through a plurality of gates 90 connected to a runner (not shown), and a portion where each gate 90 is connected (that is, tabs 63a, 63b, and 63c in the cavity) , 63d, 63e, 63f) and corresponding parts) may be injected. Alternatively, a plurality of injection machines 90 are provided to correspond to the plurality of tabs 63a, 63b, 63c, 63d, 63e, and 63f, and corresponding to the plurality of tabs 63a, 63b, 63c, 63d, 63e, and 63f The gate 110 is connected to each of the portions corresponding to ), so that the resin injected from the single injection machine 90 can be guided through the single gate 110 . Meanwhile, although only the tabs 63a, 63b, and 63c and the corresponding catapults 90a, 90b, and 90c are shown in FIG. 6, the tabs 63d, 63e, and 63f and the corresponding catapults and gates are further shown. may be provided.

The cavity may be formed by a plurality of molds 101 to 109. Referring to FIG. 6 , in the embodiment, the molds 101 to 109 include an inner circumferential mold 101 forming the inner circumferential surface of the gasket 60, a front end mold 102 forming the front end of the gasket 60, and a gasket 60 It may include a rear end mold 103 forming the rear end of the ) and outer circumferential molds 104 to 109 forming the outer circumferential surface of the gasket 60. Some of these molds 101 to 109 are configured to be movable so that the release operation can be performed smoothly.

The tabs 63a, 63b, 63c, 63d, 63e, and 63f have a thickness D defined in the front-back direction and have a plate shape protruding radially from the rear end 61 of the annular shape with a length L greater than the thickness D. can take the form of The gate 110 may extend in the thickness direction of the tabs 63a, 63b, 63c, 63d, 63e, and 63f. The gate 110 may be connected to a rear surface of a portion of the cavity corresponding to the tabs 63a, 63b, 63c, 63d, 63e, and 63f. In this case, gate protrusions 67 are formed on rear surfaces of the tabs 63a, 63b, 63c, 63d, 63e, and 63f.

The resin guided through the gate 110 may be injected in the thickness direction of the tabs 63a, 63b, 63c, 63d, 63e, and 63f. ⓐ, ⓑ, ⓒ, ⓓ, ⓔ, and ⓕ shown in FIG. 6 indicate directions in which the resin is injected.

An annular wire winding groove 68 in which a wire (not shown) is wound may be formed on an outer circumferential surface of the gasket 60 at a portion extending forward from the annular rear end 61 of the gasket 60 . The wire winding groove 68 extends along the circumferential direction of the gasket 60 to form an annular shape, and a wire (not shown) binding the gasket 60 and the reservoir 30 may be wound around the wire winding groove 68. .

Meanwhile, a plurality of nozzles 66a, 66b, 66c, and 66d may be formed on the inner circumferential surface of the gasket 60 along the circumferential direction, and a plurality of water supply ports communicating with the plurality of nozzles may be formed on the outer circumferential surface of the gasket 60, respectively. (64a, 64b, 64c, 64d) can be formed.

A circulating water guide pipe 80 connected to the circulation pipe 19 may be installed in the gasket 60 . A plurality of water supply ports (not shown) connected to the plurality of water supply ports 64a, 64b, 64c, and 64d, respectively, may be formed in the circulating water guide pipe 80.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Various modifications and implementations are possible by those skilled in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

Claims (10)

It is applied to a washing machine in which a casing having a laundry inlet is formed on the front side and a water tank having an opening on the front side is disposed at the rear of the front side, and is interposed between the front side of the casing and the water storage tank, and extends from the front end of the annular shape to the rear end of the annular shape. In the gasket manufacturing method of extending to form a tubular passage connecting the laundry inlet and the opening,
The gasket,
A tab extending outward along a radial direction from the rear edge of the annular shape,
Resin in a molten state is injected by an injection machine into a cavity corresponding to the gasket formed by a mold cavity, mold, or movable platen, and the resin is injected through a gate connected to a portion corresponding to the tab,
The tab is
It has a thickness defined in the front-back direction and has a plate-like shape protruding outward in a radial direction from the outer edge of the rear end of the annular shape with a length greater than the thickness, and a protrusion formed by the gate of the mold is formed on the rear surface of the tab. becomes,
A method of manufacturing a gasket in which the resin is injected in the thickness direction of the tab. delete ◈Claim 3 was abandoned when the registration fee was paid.◈ According to claim 1,
The tab is
A plurality is formed on the rear end of the annular shape, and the resin is injected into each part corresponding to the plurality of tabs in the cavity. ◈Claim 4 was abandoned when the registration fee was paid.◈ According to claim 1,
The gasket,
At a portion extending forward from the rear end of the annular shape, a wire winding groove extending along the circumferential direction of the gasket to form an annular shape and in which a wire binding the gasket and the water reservoir is wound is formed. Gasket manufacturing method. ◈Claim 5 was abandoned when the registration fee was paid.◈ According to claim 1,
A gasket manufactured by the above gasket manufacturing method. A gasket applied to a washing machine in which a casing having a laundry input port formed on the front side and a water storage tank having an opening formed on the front side are disposed at the rear of the front side, and formed by injection molding, the gasket comprising:
The gasket,
It is interposed between the front portion of the casing and the water storage tank, and extends from the front end of the annular shape to the rear end of the annular shape to form a tubular passage connecting the inlet and the opening, and extending in a radial direction from the rear edge of the annular shape. The tab extends outward along the
The tab is
It has a thickness defined in the front-back direction and has a plate-like shape protruding outward in the radial direction from the outer edge of the rear end of the annular shape with a length greater than the thickness,
In the tab,
A gasket in which a protrusion formed by a gate of an injection mold is formed on a rear surface of the tab. delete delete ◈Claim 9 was abandoned when the registration fee was paid.◈ According to claim 6,
The gasket,
A gasket in which a wire winding groove extending forward from the rear end of the annular shape extends along the circumferential direction of the gasket to form an annular shape, and a wire winding groove for binding the gasket and the water reservoir is wound. ◈Claim 10 was abandoned when the registration fee was paid.◈ According to claim 6,
A gasket in which a plurality of tabs are formed.

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