KR20110125096A - Impeller and drarin pump having the same - Google Patents

Abstract

PURPOSE: An impeller and drainage pump including the same, which can improve performance of a motor and pump, is provided to prevent the inflow of washing water and drain water to a housing of drainage pump. CONSTITUTION: An impeller comprises a boss part(210), a blade part(220) and a flange part(230). The boss part is combined in the rotary shaft. The blade part protrudes on the outer circumference of the boss part in a radial direction. The flange part is formed to be extended to a radial direction from one end of the axis direction of a boss part. The flange part interlinks blade parts each other. The outer circumference of the flange part is formed into non-circular shape when around the boss part.

Description

Impeller and drainage pump having same {IMPELLER AND DRARIN PUMP HAVING THE SAME}

The present invention relates to an impeller coupled to a Bieldich motor and a drainage pump using the same, in particular a stator in the interior of the housing, an impeller coupled to a rotating shaft of the Bieldich motor is installed in the rotor outside the housing and a drainage pump having the same It is about.

In general, a brushless DC motor (BLDC) forms a rotating magnetic field by winding a three-phase coil on a stator, and attaches a permanent magnet to a rotor, thereby mutually interfering with the magnetic field formed in the stator and the magnetic field of the permanent magnet. It is a kind of DC motor that gets rotational force by action.

In other words, the BLD motor applies a control signal to the power drive module according to the position of the rotor and flows an appropriate current to the three-phase coil of the stator, thereby generating rotational force by the interaction of the magnetic field of the rotor with the magnetic field caused by the current applied to the stator. Get

These BLD motors have been used in various fields in recent years by reducing the noise and maintenance costs by removing the brushes, which are disadvantages of DC motors, while including all the advantages of DC motors such as ease of operation and ease of rotation control.

For example, Bieldish motor is also used in the drain pump of a washing machine or dishwasher. In the case of the drain pump, since the impeller must be operated under the water-filled condition, the sealing degree of the driving unit must be closely maintained to increase the performance of the motor and the pump.

In addition, the drainage pump has to reduce the back pressure that causes the washing water to flow into the rear surface of the impeller and causes the impeller to swing in the axial direction, and to prevent foreign matter from being wound around the blade of the impeller, thereby improving the efficiency of the motor and the pump. Can be.

However, the impeller applied to the conventional drainage pump can lower the back pressure of the impeller as the flange portion connecting the blade portion does not extend from the end of the blade portion but extends in the middle, but the foreign material is easily wound on the blade portion, thereby increasing the input of the motor. As a result, there is a problem that the efficiency and performance of the drainage pump is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide an impeller and a drainage pump having the same, which can increase the efficiency of a motor and a pump by preventing water from flowing into the back of the impeller and preventing the foreign matter from being wound around the blade at the same time. It is.

In order to achieve the object of the present invention, the boss coupled to the rotating shaft; A plurality of blade portions protruding radially from an outer circumferential surface of the boss portion; And a flange portion extending radially from one end in the axial direction of the boss to connect the blade portions to each other, wherein the flange portion is formed to be connected to each other at a radial end of the blade portion, and an outer circumferential surface of the flange portion. Is provided with an impeller formed non-circularly when centering the boss portion.

In addition, the housing is coupled to the sump (sump) that the water is collected and the stator is fixed therein; A rotor accommodating groove provided in the housing to have a predetermined depth in the stator direction; A rotor inserted into the rotor accommodating groove from the outside of the housing and rotatably installed; And an impeller coupled to the rotating shaft provided in the rotor to drain water while rotating. A plurality of blade portions protruding radially from an outer circumferential surface of the boss portion; And a flange portion extending radially from one end in the axial direction of the boss to connect the blade portions to each other, wherein the flange portion is formed to be connected to each other at a radial end of the blade portion, and an outer circumferential surface of the flange portion. Is provided with a drain pump having an impeller formed in a non-circular shape when centering the boss portion.

Impeller of the present invention and the drain pump having the same, while the stator is coupled to the inside of the sealed housing while the rotor is installed on the outside of the housing can effectively prevent the washing water or dirt from entering the housing of the drain pump It can improve the performance of motor and pump.

In addition, the impeller can prevent various kinds of dirt from being wound around the radial end of the blade portion as the flange portion is formed to extend from the end of the blade portion, and the sealer is formed as the flange portion is formed linearly or has a curvature in the boss portion direction. It can be easily assembled to the housing.

In addition, the sealing protrusions are formed to overlap the flange and the sealer of the impeller, respectively, to prevent the washing water and the dirt from entering the back of the impeller, and a water flow hole is formed in the flange to reduce the back pressure at the back of the impeller. You can.

1 is a longitudinal sectional view schematically showing a dishwasher to which a drain pump having a Bildish motor of the present invention is applied;
Figure 2 is an exploded perspective view showing a drive unit of the dishwasher according to Figure 1,
3 is a plan view showing the dishwasher drive unit according to FIG.
4 is an exploded perspective view of the drain pump applied to the dishwasher according to the present invention;
5 is a perspective view showing the assembly of the drain pump according to FIG.
Figure 6 is a perspective view showing an example of the impeller of the drain pump according to Figure 4,
7 and 8 are a plan view and a rear view of the impeller according to FIG. 6,
Figure 9 is a longitudinal cross-sectional view showing the flow of washing water in the rear of the impeller according to FIG.

Hereinafter, an impeller according to the present invention and a drain pump having the same will be described in detail based on an embodiment shown in the accompanying drawings.

1 is a longitudinal sectional view schematically showing a dishwasher to which a drain pump having a Bildish motor of the present invention is applied, FIG. 2 is an exploded perspective view showing a driving unit of the dishwasher according to FIG. 1, and FIG. 3 is a tableware according to FIG. 1. This is a plan view showing the washing machine drive unit.

Referring to FIG. 1, a water collecting device 1 is installed inside the dish washing machine. Upper / lower connecting pipes 2.3 are respectively connected to the water collecting device 1, and upper / lower injection arms 4 and 5 are connected to the upper / lower connecting pipes 2.3, respectively.

The upper and lower injection arms 4 and 5 are rotatably installed on the top of the water collecting device 1. A plurality of injection holes (unsigned) are formed in the upper and lower injection arms 4 and 5. The injection hole is formed to be able to spray the washing water at an angle.

An upper rack 6 is provided at an upper portion of the upper injection arm 4, and a lower rack 7 is installed at an upper portion of the lower injection arm 5. The upper rack 6 and the lower rack 7 is formed to hold dishes.

2 and 3, the water collecting device 1 includes a sump 11, a washing pump 12 and 15, a flow path switching motor 13, a heater 14, a valve 16, and drainage. A pump 17, a filtering housing 20, and a filtering panel 27.

The sump 11 is formed with a predetermined space to collect the washing water therein. In the lower part of the sump 11, a washing motor 12 for supplying washing water, a flow path switching motor 13 for selectively or simultaneously opening and closing the main flow passages 22 and 23 to be described later, and a drain pump for drainage ( 17) is installed. In addition, a heater 14 is installed in the sump 11 to heat the washing water, and a filtering housing 20 is installed above the heater 14.

The lower part of the filtering housing 20 is provided with a washing impeller 15 which is axially coupled to the washing motor 12 to rotate. As the washing motor 12 is operated, the washing impeller 15 is rotated to pump the washing water collected in the sump 11 into the filtering housing 20.

In addition, a valve 16 is installed in the filtering housing 20, and the valve 16 is axially coupled to the flow path switching motor 13.

The filtering panel 27 is installed above the filtering housing 20. The filtering panel is generally formed in a disc shape and installed to cover the upper end of the sump 11. A plurality of drain holes 28 are formed at the edge of the filtering panel, and a filter 29 having a predetermined mesh is installed at the center of the drain holes 28.

A dirt chamber 26 is formed in the filtering housing 20. A filter of the filtering panel 27 is disposed above the dirt chamber 26, and a drainage hole 28 is formed outside the dirt chamber 26. The drain hole 28 collects the wash water dropped from the upper / lower racks 6 and 7 back to the sump 11 and allows the wash water filtered by the filter to be recovered to the sump 11.

The filter 29 is filtered, and the lower injection arm 5 installed on the upper side of the filtering panel 27 sprays washing water onto the filter 29 as shown in FIG. 1 to drop the dirt.

The washing water inlet 21 is formed in the filtering housing 20 such that the washing water pumped from the washing impeller 15 is introduced.

Two main flow paths 22 and 23, which are passages for guiding the washing water to the respective injection arms 5 and 6, are branched to the washing water inlet 21. Each of the main flow paths 22 and 23 is connected to the upper and lower connection pipes 2.3.

In addition, a sampling passage 24 is formed in the washing water inlet 21 so that a portion of the pumped washing water is introduced, and a dirt chamber 26 is formed to be connected to the sampling passage 24.

A pollution degree sensor 25 is installed in the sampling flow passage 24 to measure the contamination of the washing water. The pollution sensor 25 measures the pollution level of the washing water by the light emitting unit and the light receiving unit.

The washing water introduced into the sampling flow passage 24 flows into the dirt chamber 26. The wash water of the dirt chamber 26 is overflowed so that the dirt contained in the wash water is filtered out. The filtered wash water flows back into the sump 11 through the drain hole 28 of the filtering panel.

A drain hole 26a is formed in a predetermined portion of the dirt chamber 26. The drain hole 26a is protruded downward by a predetermined length from the bottom of the filtering housing 20 so as to be located in the drain chamber 18 to be described later.

The drain chamber 18 is formed at one lower side of the sump 11, and the drain pump 17 is coupled to the opening side of the drain chamber 18. A drain pipe 19 is formed at one main surface of the drain chamber 18, and a drain hose 9 is connected to the drain pipe 19 to discharge the washing water to the outside.

The dishwasher as described above is operated as follows.

That is, the dish washing machine washes the dishes while sequentially or selectively performing pre-washing, main washing, rinsing, heating rinsing and drying. Between these strokes, a drain stroke is performed using the drain pump. Hereinafter, the main washing operation will be described.

When the main washing stroke is started, the washing impeller 15 rotates as the washing pump 12 is rotated to pump the washing water (including the detergent) of the sump 11 into the filtering housing 20. The wash water flows into the wash water inlet 21 of the filtering housing 20.

Subsequently, as the flow path switching motor 13 is rotated, the valve 16 selectively opens or closes the two main flow paths 22 and 23. In this case, a part of the washing water is selectively or simultaneously introduced into the upper injection arm 4 and the lower injection arm 5 through the main flow passages 22 and 23. At the same time, the remaining portion of the wash water flows into the waste chamber 26 through the sampling flow passage 24. Subsequently, the washing water having washed the dishes falls on the filtering panel 27, and the washing water is recovered to the sump 11 through the drain hole 28 of the filtering panel 27.

Here, when the dishes are placed in the upper and lower racks 6 and 7 and washed simultaneously, the valve is rotated to open both main flow passages 22 and 23 and flows into the washing water inlet 21. The washed water is supplied to the upper and lower spray arms 4 and 5 simultaneously to simultaneously wash the dishes stored in the upper rack 6 and the lower rack 7.

On the other hand, when the dishes are placed only on the upper rack 6 or the lower rack 7 and only the dishes of one rack are washed, the valve 16 opens the main flow path 23 connected to the lower injection arm 5. It is rotated to close or rotated to close the main flow passage 22 which is connected to the upper injection arm 4. The washing water introduced into the washing water inlet 21 is supplied only to the upper spray arm 4 or the lower spray arm 5 to selectively wash the dishes stored in the upper rack 6 or the lower rack 7.

On the other hand, the remaining portion of the wash water is introduced into the waste chamber 26 through the sampling flow path 24, the pollution sensor 25 measures the contamination level of the wash water and transmits information about it to the control unit, the control unit of the wash water The drainage hole 26a of the dirt chamber 26 is opened and closed according to the degree of contamination.

The washing water of the sampling flow passage 24 is introduced into the waste chamber 26 through the pollution degree sensor 25, and the washing water overflows through the filter 29 located above the waste chamber 26. At this time, the filter 29 filters out foreign substances contained in the washing water. The filtered wash water flows back into the sump 11 through the drain hole 28 of the filtering panel 27.

As this washing process is performed for a predetermined time, a larger amount of food waste is collected in the filter device 170. The wash stroke is then completed and the drain stroke begins.

That is, when the drain pump 17 is operated, the wash water of the sump 11 is introduced into the waste chamber 26 by the suction force of the drain pump 17, and the wash water is collected in the waste chamber 26. Together with the drain chamber 18, the dirt and washing water of the drain chamber 18 is discharged to the outside through the drain pipe 19 and the drain hose (9).

As described above, the drain pump operates in a state in which the drain pump is always immersed in the wash water as it is installed in the drain chamber filled with the wash water. Therefore, in the drain pump, it is necessary to prevent the washing water from flowing into the pump to increase the pump efficiency.

Figure 4 is a perspective view showing an exploded view of the drain pump applied to the dishwasher according to the present invention, Figure 5 is a perspective view showing the assembly of the drain pump according to Figure 4, Figure 6 is an example of an impeller of the drain pump according to Figure 4 7 and 8 are a plan view and a rear view of the impeller according to FIG. 6, and FIG. 9 is a longitudinal cross-sectional view showing the flow of washing water from the rear surface of the impeller according to FIG. 6.

4 and 5, the drain pump 17 according to the present invention is coupled to the drain chamber 18 of the sump 11, the drain motor 100 for generating a rotational force in one direction or in both directions, and It is composed of a drain side impeller (hereinafter, abbreviated as impeller) 200 that is axially coupled to the rotating shaft 1340 of the drain motor 100 to discharge the washing water while rotating.

The drain motor 100 has a stator 120 installed in a housing 110 having a sealed inner space, and a rotor 130 is rotatably installed outside the housing 110. That is, the drainage motor 100 may effectively block washing water or dirt from entering the stator 120 as the stator 120 and the rotor 130 are separately installed in the inside and the outside of the housing 110.

The housing 110 has a rotor accommodating groove 114 formed on one side thereof, and a first housing 1110 having an opening surface by opening the other side thereof, and the opening surface of the first housing 1110 to cover the stator. The second housing 1120 is detachably coupled to the first housing 1110 so that the internal space in which the 120 is installed is sealed.

On one side of the first housing 1110, that is, the outer surface opposite to the drain chamber 18, a plurality of rotations of the pump housing 101 coupled to the pump case 101 are coupled to the drain chamber 18. The fastening protrusion 103 is formed along the circumferential direction. In addition, a rotor accommodating groove 1111 having a predetermined depth in the direction of the second housing is formed in the center of the outer surface of the first housing 1110 so that the rotor 130 to be described later is inserted. The rotor accommodating groove 1111 is formed in a shape in which one side is blocked in the axial direction while opening in the other side, that is, in a direction opposite to the drain chamber 18.

The outer circumferential surface of the rotor accommodating groove 1111, that is, the stator 120 is inserted into and fixedly coupled to the inner space of the housing 110, and the rotor 130 is rotatably inserted into the rotor accommodating groove 1111. do. Therefore, the stator 120 and the rotor 130 are disposed inside and outside with the housing 110 interposed therebetween, and the rotor 130 is disposed in the axial height range of the stator 120.

At least two hook protrusions 1117 are formed on the outer circumferential surface of the first housing 1110 along the circumferential direction, and three hook protrusions 1117 are formed on the edge of the second housing 1120. At least two hook hooks 1121 are formed along the circumferential direction so as to be attached to and detached from the protrusion 1117.

The stator 120 may include a stator core 1210, a coil 1220, and an insulator 1230. The stator 120 has an inner circumferential surface thereof inserted into an outer circumferential surface of the rotor accommodating groove 1111 provided in the first housing 1110.

The rotor 130 is integrated into the rotor core 1310, a plurality of magnets 1320, a molding cover 1330 surrounding the rotor cores 1310 and the magnets 1320, and the rotor core 1310. It consists of a rotating shaft 1340 coupled to.

Outside the rotor 130, that is, between the rotor 130 and the impeller 200 prevents the rotor 130 from being separated from the rotor accommodating groove 1111 and at the same time wash water penetrates toward the rotor 130. A sealer 140 may be installed to prevent this.

The sealer 140 includes a sealing base 1410, a sealing member 1420, and a sealing cover 1430.

The sealing base 1410 is rotatably coupled to the rotation shaft 1340 of the rotor 130, the sealing member 1420 is the sealing base so that its outer peripheral surface is in contact with the inner peripheral surface of the rotor receiving groove 1111 The sealing cover 1430 is coupled to the sealing base 1410 by pressing the sealing member 1420 so that the sealing member 1420 is fixed to the sealing base 1410.

6 to 8, the impeller 200 includes a boss 210, a plurality of blades 220, and a flange 230.

The boss portion 210 is coupled to the rotating shaft 1340 of the drain motor 100, the blade portion 220 extends radially from the outer circumferential surface of the boss portion 210, the flange portion 230 is a blade portion It is formed in the shape of a flat plate to connect between the 220.

The boss portion 210 may be formed in a cross-sectional shape in which the inner circumferential surface thereof is decut so as to correspond to the end of the rotation shaft 1340.

The blade portion 220 may have the same height in the radial direction, but the opposite surface of the flange portion 230 is formed to be lowered toward the direction away from the boss portion 210 to increase the pumping amount. It is preferable to be able.

The flange portion 230 extends from one side of the blade portion 220 in the axial direction and is formed to connect the plurality of blade portions 220 to each other. And the flange portion 230 is preferably extended from the radial end of the blade portion 220 can prevent the foreign material is caught on the blade portion 220. The outer circumferential surface of the flange portion 220 is non-circular, that is, when the center of the boss 210 is formed in a straight line, or the outer peripheral surface is formed to be curved so as to have a predetermined curvature in the direction of the boss portion assembly of the sealer May be easier.

In addition, at least one water flow holl 2311 is formed in the flange portion 230 between the blade portions 220 to increase the pump efficiency by lowering the water pressure at the back side of the impeller. In addition, an annular first sealing protrusion 2312 is formed on the rear surface of the flange portion 230 to prevent water from flowing into the rear surface of the flange portion 220, while corresponding to the flange portion 230. A second sealing protrusion 1434 having an annular shape to form a double wall together with the first sealing protrusion 2312 may be formed on an upper surface of the sealer 140.

Here, as shown in FIG. 9, the second sealing protrusion 1434 is inserted into the first sealing protrusion 2312, and the water flow hole 2311 of the flange portion 230 is the first sealing protrusion. At least a portion of the flange portion 230 may be formed between the second sealing protrusion 1434 and the second sealing protrusion 1434, so that the water flowing into the rear surface of the flange portion 230 easily escapes toward the impeller through the water flow hole 2311. It may be desirable to lower the water pressure.

In the figure, reference numeral 1113 is a seating surface on which the sealer is seated, 1115 is a bearing groove, 1116 is a lubrication reservoir, 1119 and 1122 are connector insertion grooves, 1123 and 1124 are support protrusions, and 1130 is a first protrusion. Bearing bushing, 1131 is the first journal bearing part, 1132 is the first thrust bearing part, 1211 is the slit, 1240 is the connector, 1331 is the lubrication storage part, 1332 is the first through hole for magnetization, 1333 is a second through hole for magnet identification, 1440 is a second bearing bush, 1441 is a second low shock bearing part, and 1442 is a second thrust bearing part.

The assembly process of the drain pump according to the present invention as described above is as follows.

That is, the stator 120 is inserted into the outer circumferential surface of the rotor accommodating groove 1111 of the first housing 1110, and the second housing 1120 is coupled to the first housing 1110. At this time, the hook hanger 1121 of the second housing 1120 is caught in the hook protrusion 1117 of the first housing 1110 in the axial direction to prevent the removal.

Next, the sealer 140 and the impeller 200 are sequentially inserted into and coupled to the rotation shaft 1340 of the rotor 130.

Next, the module combining the rotor 130, the sealer 140, and the impeller 200 is inserted into and coupled to the rotor accommodating groove 1111 of the first housing 1110. At this time, since the upper surface of the sealer 140 is visible to the outside of the flange portion 230 during the plane projection of the impeller 200, the operator presses the sealer 140, the restraining protrusion 1431 of the sealer 140 is It is inserted into the restraint groove 1114 of the rotor accommodating groove 1111 to restrain in the axial direction.

Next, the fastening protrusion 101 of the drain pump 17 is inserted into the fastening groove 103 of the pump case 102 to be coupled. At this time, the operator grabs and turns the guide rib 1118 provided in the housing 110 of the drain pump 17.

On the other hand, the effect of the drain pump according to the present invention as described above are as follows.

That is, when the drain stroke is started and power is applied to the coil 1220 of the stator 120, the rotor 12 may interact with the coil 1320 of the stator 120 and the magnet 1320 of the rotor 130 by interaction. 130 rotates, and when the rotor 130 rotates, the impeller 200 coupled to the rotating shaft 1340 of the rotor 130 rotates to wash water and dirt collected on the sump 11. The pumped to the drain chamber 18 is discharged to the outside through the drain hose (9).

In this case, the rotor 130 rotates only in one direction or alternately rotates in both directions depending on the direction of the current supplied to the stator 120. That is, when foreign matter is not caught in the impeller 200, the rotor 130 rotates only in one direction to continuously discharge the washing water for a predetermined time. However, when foreign matter is caught in the impeller 200, the load is rapidly increased on the drain motor 100 so that the bidirectional current is supplied to the stator 120 so that the rotor 130 and the impeller 200 are temporarily Repeated forward and reverse rotation to remove the foreign matter stuck to the impeller 200 and then proceed with the discharge operation.

And while the rotor 130 and the impeller 200 rotates while the washing water is added to the impeller 200 in both axial directions, while the rotor 130 and the impeller 200 moves finely in the axial direction washing water By buffering the water pressure applied to the impeller 200, the drainage pump can smoothly discharge the washing water and dirt.

As such, the stator 120 is coupled to the inside of the sealed housing 110 while the rotor 130 is installed outside the housing 110. Accordingly, the impeller 200 exposed to the inside of the drain chamber 18 is installed outside the housing 100 of the drain pump 17 together with the rotor 130 so that the wash water or the dirt is disposed in the housing of the drain pump 17 ( 100) can be effectively prevented from entering inside. Through this, the stator 120 may be prevented from contacting with water to improve the performance of the motor and the pump.

And the impeller 200 is formed so that the flange portion 230 connecting the plurality of blade portion 220 to extend from the end of the blade portion 220, the various dirt at the radial end of the blade portion 220 You can prevent colds. In addition, as the flange portion 230 is linearly formed or has a curvature in the boss direction, the sealer 140 may be exposed out of the impeller even when the impeller 200 is assembled to the rotation shaft 1340. Can be. Therefore, the sealer 140 can be assembled by pressing the rotor accommodating groove 1111 of the housing 10 to facilitate assembly of the pump.

The first sealing protrusion 2312 and the second sealing protrusion 1434 are formed on the rear surface of the impeller 200 and the front surface of the sealer 140 corresponding thereto to form a double wall. Accordingly, the driving of the impeller may be stabilized by preventing the washing water and the dirt from flowing into the back surface of the impeller 200 when the impeller 200 is rotated. In addition, the water flow hole 2311 is formed in the flange portion 230 of the impeller 200 so that the washing water flowing into the rear surface of the impeller 200 is discharged to the front side of the impeller 200. As a result, the impeller 200 may be severely shaken or removed by washing water introduced into the rear surface of the impeller 200, thereby improving the performance and reliability of the pump.

On the other hand, the impeller and the drain pump having the same according to the present invention may be installed in the drain pipe of the washing machine or dehydrator, although not shown in the drawings. Even in this case, since the basic configuration and operation effects of the drain pump are substantially the same as those when installed in the dishwasher, detailed description thereof will be omitted.

11: sump 17: drain pump
100: drainage motor 110: housing
120: stator 130: rotor
140: sealer 200: impeller
210: boss portion 220: blade portion
230: flange portion 1434: second sealing protrusion
2311: water flow hole 2312: first sealing protrusion

Claims (9)

A boss coupled to the rotating shaft;
A plurality of blade portions protruding radially from an outer circumferential surface of the boss portion; And
A flange portion formed to extend radially at one end of the boss in an axial direction and connecting the blade portions to each other;
The flange portion is formed so as to be connected to each other at the radial end of the blade portion, the outer peripheral surface of the flange portion is formed in a non-circular shape when the center of the boss portion. The method of claim 1,
The flange portion impeller is formed so that its outer peripheral surface is curved to have a predetermined curvature in the boss direction. The method of claim 1,
The flange portion has an impeller linearly formed on its outer circumferential surface. The method of claim 1,
At least one through-hole is formed in the flange portion between the blade portion impeller. A housing coupled to a sump for collecting water and having a stator fixed thereto;
A rotor accommodating groove provided in the housing to have a predetermined depth in the stator direction;
A rotor inserted into the rotor accommodating groove from the outside of the housing and rotatably installed; And
Includes; an impeller coupled to the rotating shaft provided in the rotor for rotating the water while rotating;
The impeller is a drain pump formed of any one of claims 1 to 4. The method of claim 5,
A drain pump having a first sealing protrusion formed in the rotor direction on a rear surface of the flange of the impeller. The method of claim 6,
It is further provided with a sealer (sealer) positioned between the impeller and the rotor to cover the rotor receiving groove of the housing,
One side of the sealer is a drain pump in which a second sealing protrusion is formed in the impeller direction to form a double wall with the first sealing protrusion. The method of claim 7, wherein
A through-hole is formed in the flange portion, the through-hole drainage pump is formed so that at least part is located between the first sealing protrusion and the second sealing protrusion. The method of claim 5,
The impeller drainage pump is formed such that the diameter of the virtual circle connecting the end of the blade portion is smaller than the outer diameter of the sealer.

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