KR20160102707A - Washing machine - Google Patents

Abstract

The present invention relates to a washing machine having a dual check valve provided on a hose to prevent a backflow of the washing water. According to the present invention, the washing machine comprises: a valve body to flow the washing water to the inside; a first member inserted to one side of the valve body, and to flow the washing water only in a single direction; and a second member inserted to an other side of the valve body, and to flow the washing water only in a single direction. The present invention is able to prevent the backflow of the washing water using a single dual check valve as a double structure, with advantages of reducing the installation time and reducing the leakage risk with a simplified installation structure.

Description

Washing machine {WASHING MACHINE}

The present invention relates to a washing machine.

Generally, a washing machine is an apparatus for washing clothes using an emulsifying action of a detergent, a water flow action caused by the rotation of the washing tub or the laundry blades, and a shock action applied by the laundry blades, and uses laundry detergent and water Washing, rinsing or dewatering process is performed so as to remove the contamination on the surface (hereinafter referred to as "foam").

The washing machine receives the washing water and circulates the washing water to remove the contamination of the laundry.

A check valve is installed in the pipe through which the wash water flows.

The check valve prevents reverse flow of washing water by instantaneous pressure change or reverse osmosis.

Particularly, in case of the conventional washing machine, two check valves are installed in one pipe in case the check valve is damaged or broken, so that even if one of them is broken, the washing machine can be normally operated.

However, when two check valves are installed in one pipe as in the related art, there is a problem that the material cost is increased due to an increase in the number of parts.

In addition, since a plurality of check valves are provided, the assembling time is increased and the assemblability is deteriorated.

In addition, since a plurality of check valves are provided in one piping, there is a problem that the possibility of occurrence of leakage or the like due to poor assembling is increased.

Korea Patent No. 10-0373483

A problem to be solved by the present invention is to provide a washing machine provided with a dual check valve for preventing reverse flow of washing water.

Another object of the present invention is to provide a dual check valve made of one part.

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

According to an aspect of the present invention, there is provided a washing machine including a dual check valve installed in a hose to prevent reverse flow of washing water, the dual check valve comprising: a valve body for flowing wash water into the washing chamber; A first member inserted into one side of the valve body and allowing the washing water to flow only in one direction; And a second member inserted into the other side of the valve body and allowing the wash water to flow only in one direction.

Wherein the first member is provided with a first check valve portion for preventing backwash of the washing water and the second member is provided with a second check valve portion for preventing backwash of the washing water, The valve portion may be formed in the same direction.

Wherein the first member includes: a member body having a valve cavity formed therein to allow wash water to flow therein; An engaging part formed at one side of the member body and forming an interlock at one side of the valve body; And a first check valve part formed of two plates protruding to the other side of the member body and having a tip thereof tightly adhered and performing a check valve function with respect to the wash water.

The second member may include a member body having a valve cavity formed therein to allow wash water to flow therein; An engaging portion formed on the other side of the member body and forming an interlock on the other side of the valve body; And a second check valve formed in the same direction as the first check valve unit and configured to perform a check valve function with respect to the wash water, And a check valve portion.

And a first fixing member which is inserted into the first member and fixes the first member to the valve body and fixes the valve body.

And a second fixing member inserted into the second member and fixing the second member in close contact with the valve body.

According to another aspect of the present invention, there is provided a washing machine comprising: a cabinet forming an outer appearance; A tub for receiving wash water; A drum disposed in the tub and adapted to receive and rotate the cloth therein; A water supply unit which receives the wash water from an external water source and supplies the wash water to the tub; A spray nozzle for spraying the wash water supplied from the water supply unit into the drum; A hose for connecting the water supply unit and the spray nozzle to guide wash water; And a dual check valve installed in the hose to double-check the reverse flow of the wash water.

The dual check valve includes: a valve body for allowing wash water to flow therein; A first member inserted into one side of the valve body and allowing the washing water to flow only in one direction; A second member inserted into the other side of the valve body and allowing the wash water to flow only in one direction; A first fixing member inserted into the first member to closely fix the first member to the valve body; And a second fixing member inserted into the second member and closely fixing the second member to the valve body.

Wherein the first member includes: a member body having a valve cavity formed therein to allow wash water to flow therein; An engaging part formed at one side of the member body and forming an interlock at one side of the valve body; And a first check valve part formed of two plates protruding to the other side of the member body and having a tip thereof tightly adhered and performing a check valve function with respect to the wash water.

The second member may include a member body having a valve cavity formed therein to allow wash water to flow therein; An engaging portion formed on the other side of the member body and forming an interlock on the other side of the valve body; And a second check valve formed in the same direction as the first check valve unit and configured to perform a check valve function with respect to the wash water, And a check valve portion.

According to the washing machine and its control method of the present invention, one or more of the following effects can be obtained.

First, the present invention is advantageous in that the reverse flow of washing water through a single dual check valve can be prevented.

Second, when installing a dual check valve in a hose, the installation time can be reduced and the installation structure can be simplified, thereby reducing the risk of leakage.

Third, since only one dual check valve is installed in order to prevent reverse flow of washing water, the installation cost is reduced.

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

1 is a perspective view illustrating a washing machine according to an embodiment of the present invention.
2 is a perspective view showing the internal structure of the washing machine shown in FIG.
3 is a cross-sectional view of a part of the washing machine shown in FIG.
Fig. 4 is a front view showing the internal structure of the washing machine shown in Fig. 1. Fig.
Figure 5 is a perspective view of the dual check valve shown in Figure 2;
6 is an exploded perspective view of the dual check valve shown in FIG.
Figure 7 is a cross-sectional view of the dual check valve shown in Figure 2;
8 is a front view of a dual check valve according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a washing machine and its control method according to embodiments of the present invention.

FIG. 1 is a perspective view showing a washing machine according to an embodiment of the present invention, FIG. 2 is a perspective view showing an internal structure of the washing machine shown in FIG. 1, FIG. 3 is a cross- And FIG. 4 is a front view showing the internal structure of the washing machine shown in FIG.

A washing machine 100 according to an embodiment of the present invention includes a cabinet 111 for forming an outer appearance, a tub 122 for receiving wash water, a drum 122 disposed in the tub, A water supply unit 132 for supplying laundry water from the external water source to the tub 122 and for supplying the washing water supplied from the water supply unit 132 to the tub 122; A detergent box 133 for containing laundry detergent and mixing the wash water with the detergent detergent, and a detergent box 133 for discharging the wash water in the tub to supply the detergent to the inside of the tub A pump 136 for circulating the wash water, and a circulation nozzle 139 for spraying the wash water circulated by the pump 136 into the drum.

The cabinet 111 forms the appearance of the washing machine 100. A tub 122 is provided in the cabinet 111. The cabinet 111 is formed with a bag entrance / exit hole 117 so that the bag can be taken in and out. A door 112 is rotatably provided on a front surface of the cabinet 111 so as to open and close the blind hole 117. The cabinet 111 is provided with a control panel 114 for receiving commands from a user and displaying various status information of the washing machine 100. The cabinet 111 is provided with a detergent box 133 for detachably receiving a detergent such as laundry detergent, rinsing detergent or bleach.

The tub 122 is buffered by a spring unit 170 and a damper 160 installed in the cabinet 111. The tub 122 receives wash water. A drum 124 is disposed inside the tub 122.

The tub 122 may be provided with a water level sensor 121 for sensing the level of the washing water contained in the tub. The water level sensor 121 may be implemented in various ways. In the present embodiment, the interval between the electrodes is changed by using the air pressure that changes according to the washing water level, and the water level is measured by the amount of capacitance change of the electrode. A heater 143 for heating the washing water may be provided in the tub 122.

The drum 124 receives the pod and rotates. A plurality of through holes 124b are formed in the drum 124 to allow the washing water to pass therethrough. On the inner wall of the drum 124, a lifter 124a lifting the drum 124 at a predetermined height may be disposed. The drum 124 receives the rotational force by the driving unit 113 and rotates.

The drum 124 may be arranged so as to have a predetermined inclination such that the rear portion of the drum 124 descends below the horizontal rather than horizontally.

A gasket 128 is provided between the tub 122 and the cabinet 111 to seal the tub 122 and the cabinet 111. The gasket 128 is disposed between the inlet of the tub 122 and the inlet / outlet hole 117. The gasket 128 alleviates an impact transmitted to the door 112 when the drum 124 rotates and prevents the wash water in the tub 122 from leaking to the outside.

The gasket 128 may be integrally formed of one material, but a portion of the gasket 128 to be fastened to the tub 122 is formed of a rigid material in order to secure the fastening strength with the tub 122 and sufficient rigidity. The portion to be coupled with the cabinet 111 may be made of a material having elasticity to mitigate the vibration transmitted from the tub 122 to the cabinet 111.

The gasket 128 is provided with a spray nozzle 151 and a circulation nozzle 139 for introducing the washing water into the drum 124 and a steam nozzle 152 for spraying steam into the drum 124.

The driving unit 113 rotates the drum 124. The driving unit 113 can rotate the drum 124 at various rotational speeds or directions. The driving unit 113 may include a motor, a switching element for controlling the motor, a clutch, and the like. The driving unit 113 may include a sensor for measuring an actual rotational speed of the drum 124. [

The detergent box 133 receives a detergent such as laundry detergent, rinse detergent or bleach. The detergent box 133 is preferably detachably provided on the front surface of the cabinet 111. The detergent in the detergent box 133 is mixed with the washing water when the washing water is supplied and flows into the tub 122. The detergent box 133 may be formed by dividing a portion where the laundry detergent is received, a portion where the rinsing detergent is received, and a portion where the bleach is received.

The washing machine 100 is connected through a hot water source HW for supplying hot water from an external water source and a hot water hose 115a and is connected to a cold water source CW for supplying cold water from an external water source through a cold water hose 115b . The water introduced through the hot water hose 115a and the cold water hose 115b is supplied to the detergent box 133, the steam unit 145 and / or the injection nozzle 151 through appropriate control of the water supply unit 132.

A water supply unit 132 connected to the hot water hose 115a and the cold water hose 115b to control the inflow of the washing water from the external water source and the water supply unit 132 connected to the water supply unit 132, A first water supply hose 131a and a second water supply hose 131b for guiding the wash water supplied from the cold water source CW to the detergent box 133 and a water supply hose 131b connected to the water supply unit 132, A third water supply hose 131c for guiding the wash water supplied from the cold water source CW to the spray nozzle 151 and the detergent box 133 according to the operation of the unit 132 is provided. The third water supply hose 131c is branched from the water supply unit 132 and connected to the injection nozzle 151 and the detergent box 133, respectively.

The cabinets 111 are connected to a water supply unit 132 through a fourth water supply hose (not shown) for guiding the wash water supplied from the cold water source CW to the steam unit 145 according to the operation of the water supply unit 132 And a fifth water supply lane 131e connected to the water supply unit 132 for guiding the high temperature washing water supplied from the hot water source HW to the detergent box 133 according to the operation of the water supply unit 132 Respectively.

It is preferable that a water supply pipe 134 into which the detergent mixed with the detergent in the detergent box 133 flows into the tub 122 is provided in the cabinet 111.

The water supply unit 132 includes a free valve 132a connected to the first water supply lake 131a, a main valve 132b connected to the second water supply hose 131b, a bleed valve 132b connected to the third water supply hose 131c, A steam valve 132d connected to the fourth water supply hose 131d and a hot water valve 132e connected to the fifth water supply lane 131e to regulate the inflow of the high temperature wash water.

The free valve 132a supplies the washing water to the detergent box 133 through the first water supply lake 131a when the free valve 132a is opened. The washing water supplied by the free valve 132a passes through the portion of the detergent box 133 where the detergent is received, is mixed with the detergent for washing, and then supplied into the tub 122 through the water supply pipe 134. The washing water supplied by the free valve 132a is supplied into the tub 122 through the water supply pipe 134 without mixing with the laundry detergent.

The main valve 132b supplies the washing water to the detergent box 133 through the second water supply liquor 131b when the main valve 132b is opened. The washing water supplied by the main valve 132b is mixed with the laundry detergent through the portion of the detergent box 133 where the detergent is received, and then supplied into the tub 122 through the water supply pipe 134.

The bleed valve 132c supplies the washing water to the spray nozzle 151 and the detergent box 133 through the third water supply hose 131c when the bleed valve 132c is opened. A part of the washing water supplied by the bleach valve 132c is injected into the drum 124 through the injection nozzle 151. [ Another portion of the wash water supplied by the bleach valve 132c is mixed with the bleach in the cleansing box 133 and fed into the tub 122 through the water line 134. In the absence of bleach, the wash water supplied by the bleach valve 132c is fed into the tub 122 through the water line 134 without mixing with the bleach.

The steam valve 132d supplies wash water to the steam unit 145 through the fourth water supply hose 131d when the steam valve 132d is opened. The wash water supplied by the steam valve 132d is heated by the steam unit 145 and converted into steam. The steam generated in the steam unit 145 is supplied to the steam nozzle 152 through the steam hose 146 and is injected into the drum 124 through the steam nozzle 152.

The hot water valve 132e supplies the washing water of high temperature to the detergent box 133 through the fifth water supplying lane 131e when the hot water valve 132e is opened. The wash water supplied by the hot water valve 132e passes through the detergent box 133 and is supplied into the tub 122 through the water supply pipe 134.

A pump 136 for discharging the washing water in the tub 122 and a circulation nozzle 134 for circulating the washing water and injecting the washing water into the drum 124, A circulation hose 137 connected to the drain pipe 139, and a drain hose 138 draining the wash water to the outside.

The pump 136 discharges the washing water in the tub 122.

The wash water that has been transferred to the pump 136 through the drain pipe 135 is drained to the outside through the drain hose 138 or circulated into the tub 122 through the circulating hose 137. The pump 136 may be a circulation pump and a drain pump and may be connected to the circulation hose 137 and the drain hose 138, respectively.

The circulation hose 137 connects the pump 136 and the circulation nozzle 139. The washing water discharged from the tub 122 by the pump 136 is injected into the drum 124 from the circulation nozzle 139 through the circulating hose 137. [

The control panel 114 is provided with an input unit 114b for inputting various operation commands such as selection of a washing course through a user, operation time and reservation for each stroke, and a display unit 114a for indicating the operating state of the washing machine 100 .

There are lingerie / wool course, boiled course, speed wash course, functional apparel course, bubble-proof course, calm quiet course, and energy conservation course in addition to the standard course depending on the type and function of the pouch. The operation of the washing machine 100 is divided into a washing cycle, a rinsing cycle, and a dewatering cycle, and a water supply step, a washing step, a rinsing step, a drainage step, a dewatering step or a drying step are performed in each stroke.

The spray nozzle 151 is provided in the gasket 128 to spray wash water into the drum 124. The injection nozzle 151 is disposed adjacent to the steam nozzle 127. The spray nozzle 151 is connected to the first water supply lake 131a and injects the wash water supplied from the external water source into the drum 124. [

The injection nozzle 151 may be disposed on the upper portion of the gasket 128. The injection nozzle 151 may be disposed below the gasket 128 or between the gasket 128 and the cabinet 111, , The tub 122, and the like.

The spray nozzle 151 is preferably an atomizing nozzle for spraying the washing water on the side surface and the rear surface of the drum 124.

The steam nozzle 152 is provided in the gasket 128 to inject steam into the drum 124. The steam nozzle 152 is connected to the steam hose 146 and injects the steam generated in the steam unit 145 into the drum 124.

The steam nozzle 152 is provided adjacent to the injection nozzle 151 on the upper portion of the gasket 128. The steam nozzle 152 may be disposed at various positions such as below the gasket 128 or between the gasket 128 and the cabinet 111, the cabinet 111, the tub 122, and the like.

The circulation nozzle 139 is provided in the gasket 128 and injects the washing water circulated by the pump 136 into the drum 124. The circulation nozzle 139 is connected to the circulation hose 137 to inject the washing water circulated by the pump 136 into the drum 124. The circulation nozzle 139 may be formed integrally with the gasket 128.

It is preferable that the circulation nozzle 139 is disposed below the rotational axis of the drum 124 to spray washing water upward. A plurality of circulation nozzles 139 may be provided, and two circulation nozzles may be provided on both sides of the lower portion of the gasket 128. The first circulation nozzle 139a is provided at the lower left of the gasket 128 to spray the wash water toward the inside of the drum 124 in the upper right direction and the second circulation nozzle 139b is disposed at the right side of the gasket 128 It is preferable that the washing water is sprayed toward the inside of the drum 124 in the upper left direction.

When a plurality of circulation nozzles 139 are provided, a plurality of circulation hoses 137 are provided so that the first circulation hose 137a is connected to the first circulation nozzle 139a and the second circulation hose 137b is connected to the second circulation nozzle 139a. It is preferable to be connected to the circulation nozzle 139b.

The washing water contained in the drum 124 moves to the pump 136 along the drain pipe 135 provided in the tub 122. The pump 136 causes the wash water to reach the circulation nozzle 139 through the circulation hose 137. The washing water is injected into the drum 124 through the circulation nozzle 139 and flows into the tub 122.

FIG. 5 is a perspective view of the dual check valve shown in FIG. 2, FIG. 6 is an exploded perspective view of the dual check valve shown in FIG. 5, and FIG. 7 is a sectional view of the dual check valve shown in FIG.

The dual check valve 200 of this embodiment is installed in the third water supply hose 131c.

The third water supply hose 131c is a hose for supplying wash water to the spray nozzle 151. [

Unlike the present embodiment, the dual check valve 200 may be installed in another hose through which the wash water flows.

The dual check valve 200 includes a valve body 250 for flowing wash water into the interior of the valve body 250, a first member 210 inserted into one side of the valve body 250 and allowing the wash water to flow in only one direction, A second member 220 which is inserted into the other side of the valve body 250 and flows the washing water only in one direction; a first member 210 inserted into the first member 210, A first fixing member 230 which is inserted into the second member 220 and which fixes the second member 220 in close contact with the valve body 250, 2 fixing member 240 as shown in FIG.

The valve body 250 includes a valve body hollow 251 through which wash water flows and a valve body rim 252 protruding outwardly.

In this embodiment, the valve body 250 is formed in a cylindrical shape.

Although the valve body 250 is formed in a straight shape in this embodiment, it may be formed in an elbow shape of "a" or "b", unlike the present embodiment.

In addition, it may be formed in a "Y" shape, and three members may be provided.

The first member 210 includes a member body 212 having a valve cavity 211 therein to allow wash water to flow therein and a second member 212 formed on the outer side of the member body 212, An engagement part 216 formed at one side of the member body 212 to form an engagement with one side of the valve body 250 and an engagement part 216 formed at one side of the member body 212 And a first check valve unit 218 inserted into the valve body 250 and performing a check valve function with respect to the washing water flowing through the valve body 250.

The member body 212 is formed in a cylindrical shape.

The friction portion 214 is formed in a ring shape on the member body 212.

The engaging portion 216 is formed to have a diameter larger than that of the member body 212 and is engaged with one side of the valve body 250.

The first check valve unit 218 is formed by two plate ends extending from the body member 212 in close contact with each other.

In the present embodiment, the first check valve portion 218 is positioned at an outer end of the member body 212.

The second member 220 is formed similarly to the first member 210.

Therefore, the shape of the member body 222, the friction portion 224, and the engaging portion 226 of the second member 220 is the same as that of the first member 210.

However, only the shape of the second check valve unit 228 is different from that of the first check valve unit 218.

The second check valve portion 228 is bent at the member body 222 and the end of the second check valve portion 228 is positioned inside the member body 222.

That is, the end of the second check valve unit 228 is formed to face the engaging part 226 side.

Therefore, the first check valve portion 218 and the second check valve portion 228 are disposed such that their ends are directed in the same direction.

The first fixing member 230 and the second fixing member 240 are formed in the same manner and are formed in a cylindrical shape in this embodiment.

The first fixing member 230 or the second fixing member 240 is inserted into the first member 210 or the second member 220 and the respective members 210 and 220 are inserted into the valve body 250, .

On the other hand, a third water supply hose 131c is fitted to the outer circumference of the valve body 250.

A clamp 260 is fastened to the third water supply hose 131c to fix the third water supply hose 131c to the valve body 250.

Referring to FIG. 7, the first member 210 is fitted to one side of the valve body 250, and the second member 220 is fitted to the other side of the valve body 250.

When the assembly of the first member 210 and the second member 220 is completed, an interspace 201 is formed between the first member 210 and the second member 220.

In this embodiment, the wash water can flow from the first member 210 to the second member 220, and in the opposite direction, the first check valve unit 218 and the second check valve unit 228 .

When a flow is formed in the opposite direction, the two plates are in close contact with each other to block the flow of washing water.

8 is a front view of a dual check valve according to a second embodiment of the present invention.

The dual check valve 300 according to the present embodiment includes a Y-shaped valve body 350 and at least one of the first member 210 and the second member 220 at each end of the valve body 350 Either one is installed.

In the present embodiment, the washing water is supplied through the two first members 210 and the washing water is discharged through the one second member 220.

The washing water may be supplied through one first member 210 and the washing water may be discharged through the two second members 220, unlike the present embodiment.

Unlike the present embodiment, the valve body 350 may be formed in a T shape.

The dual check valve according to the present embodiment can prevent the reverse flow of the wash water in the structure in which the wash water is branched or joined together.

Since the remaining configuration is the same as that of the first embodiment, the detailed description will be omitted.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and range of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

113: driving part 114: control panel
122: tub 124: drum
128: gasket 132: water supply unit
132a: Free valve 132b: Main valve
132c: bleed valve 132d: steam valve
132e: hot water valve 133: detergent box
136: Pump 137: Circulating hose
138: Drain hose 139: Circulation nozzle
141: control unit 151: injection nozzle
200: dual check valve 210: first member
211: valve hollow 212: member body
214: friction portion 216:
218: first check valve part 220: second member
211: valve hollow 212: member body
214: friction portion 216:
218: first check valve unit 230: first fixing member
240: second fixing member 250: valve body

Claims (10)

A washing machine comprising a hose through which wash water flows,
The washing machine
A dual check valve installed in the hose to prevent reverse flow of wash water,
The dual check valve includes:
A valve body for flowing wash water into the inside of the valve body;
A first member inserted into one side of the valve body and allowing the washing water to flow only in one direction;
And a second member inserted into the other side of the valve body and allowing the wash water to flow only in one direction. The method according to claim 1,
Wherein the first member is provided with a first check valve portion for preventing reverse flow of wash water,
The second member is provided with a second check valve portion for preventing the reverse flow of washing water,
Wherein the first check valve unit and the second check valve unit are formed in the same direction. The method according to claim 1,
The first member
A member body having a valve cavity formed therein to allow wash water to flow therein;
An engaging part formed at one side of the member body and forming an interlock at one side of the valve body;
And a first check valve part formed of two plates protruding to the other side of the member body and having a tip thereof tightly adhered and performing a check valve function with respect to the washing water. The method of claim 3,
The second member
A member body having a valve cavity formed therein to allow wash water to flow therein;
An engaging portion formed on the other side of the member body and forming an interlock on the other side of the valve body;
And a second check valve formed in the same direction as the first check valve unit and configured to perform a check valve function with respect to the wash water, And a check valve unit. The method according to claim 1,
And a first fixing member inserted into the first member to closely fix the first member to the valve body. The method according to claim 1,
And a second fixing member inserted into the second member to closely fix the second member to the valve body. A cabinet forming an appearance;
A tub for receiving wash water;
A drum disposed in the tub and adapted to receive and rotate the cloth therein;
A water supply unit which receives the wash water from an external water source and supplies the wash water to the tub;
A spray nozzle for spraying the wash water supplied from the water supply unit into the drum;
A hose for connecting the water supply unit and the spray nozzle to guide wash water;
And a dual check valve installed in the hose to double-check the reverse flow of the wash water. The method of claim 7,
The dual check valve includes:
A valve body for flowing wash water into the inside of the valve body;
A first member inserted into one side of the valve body and allowing the washing water to flow only in one direction;
A second member inserted into the other side of the valve body and allowing the wash water to flow only in one direction;
A first fixing member inserted into the first member to closely fix the first member to the valve body;
And a second fixing member inserted into the second member to closely fix the second member to the valve body. The method of claim 8,
The first member
A member body having a valve cavity formed therein to allow wash water to flow therein;
An engaging part formed at one side of the member body and forming an interlock at one side of the valve body;
And a first check valve part formed of two plates protruding to the other side of the member body and having a tip thereof tightly adhered and performing a check valve function with respect to the washing water. The method of claim 9,
The second member
A member body having a valve cavity formed therein to allow wash water to flow therein;
An engaging portion formed on the other side of the member body and forming an interlock on the other side of the valve body;
And a second check valve formed in the same direction as the first check valve unit and configured to perform a check valve function with respect to the wash water, And a check valve unit.

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