KR20110125099A - Brushless dc motor and drarin pump having the same - Google Patents

Abstract

PURPOSE: A brushless DC motor and a drain pump having the same are provided to reduce the friction loss of a rotary shaft while having high degree of sealing. CONSTITUTION: In a brushless DC motor and a drain pump having the same, a housing comprises a rotor accommodating groove. A stator is inserted into the outer circumference of the rotor accommodating groove and is fixed in the inner side of the housing. The rotor is inserted into the rotor accommodating groove and installed in the outside of the housing to be rotatable. A sealer is comprised of a base(1410), a sealing member(1420), and a cover(1430). The base is combined with the rotary shaft to be rotatable. The sealing member is contacted to the interior of the rotor accommodating groove.

Description

BELHLESS MOTOR AND DRAIN PUMP USING THE SAME {BRUSHLESS DC MOTOR AND DRARIN PUMP HAVING THE SAME}

The present invention relates to a Bieldi motor and a drain pump using the same, and more particularly to a Bieldi motor and a drain pump using the stator is installed in the housing, the rotor is installed on the outside of the housing.

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, when the rotary shaft rotates smoothly lubricating the rotary shaft can further increase the performance of the motor and pump.

However, the conventional BLD motor has a limitation in increasing the degree of sealing as the stator and the rotor are disposed together in the same space, that is, inside the housing. That is, when the Bieldy motor is used as a drain pump, the impeller should be coupled to the rotating shaft provided in the rotor, and the rotating shaft should be drawn out of the housing. Therefore, although the bearing hole is formed to penetrate the housing so that the rotating shaft is drawn out, it is not easy to seal the bearing hole tightly, and when the sealing hole is tightly sealed, the efficiency of the motor is reduced due to friction loss with the rotating shaft. This could be degraded.

An object of the present invention is to provide a Bieldich motor that can reduce the friction loss of the rotating shaft while high sealing degree.

In order to achieve the object of the present invention, a housing in which the rotor accommodating groove is formed; A stator inserted into an outer circumferential surface of the rotor accommodating groove and fixedly installed in the housing; And a rotor inserted into the rotor accommodating groove so as to be rotatably installed on the outside of the housing, and the outer side of the rotor is provided with a non-DC motor having a sealer to seal the rotor accommodating groove. .

In addition, the drainage motor is coupled to a sump (sump) in which water is collected to generate a one-way or two-way rotational force; And an impeller coupled to the rotating shaft of the drain motor to discharge water accumulated in the sump while rotating in one direction or in both directions, wherein the drain motor includes a housing in which a rotor accommodating groove is formed; A stator inserted into an outer circumferential surface of the rotor accommodating groove and fixedly installed in the housing; And a rotor inserted into the rotor accommodating groove so as to be rotatably installed on the outside of the housing, wherein the outer side of the rotor comprises a non-ELD motor having a sealer for covering the rotor accommodating groove. A pump is provided.

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

In addition, as the sealer is provided between the rotor and the impeller, the rotor can be stably supported, and at the same time, the washing water or the dirt can be effectively prevented from entering the rotor.

In addition, since the sealing protrusions are formed on the rear surface of the impeller and the front surface of the sealer to form a double wall, the driving of the impeller can be stabilized by preventing the washing water and the dirt from flowing into the back of the impeller during rotation of the impeller. have.

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 and 6 are a perspective view and a longitudinal sectional view showing the assembly of the drain pump according to FIG.
7 is an exploded perspective view of the sealer of the drain pump according to FIG. 4;
8 is a longitudinal sectional view showing the assembly of the sealer of the drain pump according to FIG.
Figure 9 is a longitudinal cross-sectional view showing the flow of washing water in the front of the sealer according to FIG.

Hereinafter, a Bieldich motor and a drain pump having the same according to the present invention will be described in detail with reference to 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 the disassembled 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 shows the assembly of the drain pump according to Figure 4 Longitudinal section.

4 to 6, 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 one anti-rotation rib 1112 is disposed on the outer circumferential surface of the rotor accommodating groove 1111 to be positioned between the slots 1211 of the stator core 1210 to be described later to prevent the stator 120 from moving in the circumferential direction. It is formed at predetermined intervals along the circumferential direction. In addition, a seating surface 1113 on which the sealer 140 to be described later is seated is formed on the inner circumferential surface of the rotor accommodating groove 1111, and a sealer 140 to be described later on an upper side (opening side) of the seating surface 1113. Constraints (1431) of the insertion grooves 1114 is formed to be constrained in the axial direction.

In addition, a bearing groove 1115 is formed at the center of the bottom surface of the rotor accommodating groove 1111 so that an end portion of the rotation shaft 1340 of the rotor 130 may be inserted.

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 core 1210 is formed by stacking a plurality of stator sheets having a plurality of slots 1211 along a circumferential shape in a cylindrical shape, and the coil 1220 is formed of slots 1211 of the stator core 1210. The insulator 1230 is interposed between the stator core 1210 and the coil 1220 to insulate. A substrate (not shown) for motor control is fixedly installed on one side of the insulator 1230, and a connector 1240 is electrically connected to the substrate.

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.

The rotor core 1310 is formed by stacking a plurality of rotor sheets having a shaft hole 1311 at the center thereof, and the plurality of magnets 1320 are provided with a magnet mounting groove 1312 provided in the rotor core 1310. The molding cover 1330 is inserted into and fixed thereto, and the molding cover 1330 is formed by wrapping the outer circumferential surface of the rotor core 1310 to support the magnets 1320 in an axial direction. The rotation shaft 1340 is integrally coupled to the rotor core 1310 and coupled to penetrate the molding cover 1330.

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.

7 is a perspective view showing an exploded sealer of the drain pump according to FIG. 4, FIG. 8 is a longitudinal sectional view of the sealer of the drain pump according to FIG. 7, and FIG. This is a longitudinal cross-sectional view showing the flow state.

7 and 8, 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.

The sealing base 1410 and the sealing cover 1430 are formed of a hard material formed by molding a resin while the sealing member 1420 is formed of a material having elasticity such as rubber.

In addition, on the outer circumferential surface of the sealing base 1410 or the sealing cover 1430 (the outer circumferential surface of the sealing cover in the drawing), a convex protrusion 1431 is formed in an annular shape. The restraining protrusion 1431 is inserted into the restraining groove 1114 formed in an annular shape on the inner circumferential surface of the rotor accommodating groove 1111 to prevent the rotor 130 and the sealer 140 from being separated from the housing 110. .

The first coupling protrusion 1411 having a predetermined height is formed in an annular shape on the upper edge of the sealing base 1410, and the first coupling protrusion (bending at the edge of the sealing cover 1430 in the sealing base direction) is formed. The second coupling protrusion 1432 is formed to be inserted into the outer circumferential surface of the 1411. Between the outer circumferential surface of the first coupling protrusion 1411 and the inner circumferential surface of the second coupling protrusion 1432 is connected to the connection portion 1424 of the sealing member 1420 to be described later is fixedly coupled. The sealing portion 1425 of the sealing member 1420 is pressed and fixed between the outer plane of the first coupling protrusion 1411 and the end surface of the second coupling protrusion 1432 corresponding thereto. An end of the sealing portion 1425 of the sealing member 1420 protrudes slightly outward than the outer circumferential surfaces of the sealing base 1410 and the sealing cover 1430 to elastically contact the inner circumferential surface of the rotor accommodating groove 1111. It is formed to be.

In the center of the sealer 140, that is, the center of the sealing base 1410, the sealing member 1420, and the sealing cover 1430, the bearing shafts 1412 and 1421 are rotatably passed through the rotating shaft 1340, respectively. 1433 is formed.

At least one air hole 1413 is formed around the bearing hole 1412 of the sealing base 1410, and the rotor is disposed on the bottom surface of the sealing base 1410, that is, the surface facing the rotor 130. The gap protrusion 1414 may be formed in an annular shape at an outer side of the air hole 1413 so as to maintain a gap with the 130.

A bearing bush 1440 made of metal may be installed in the bearing hole 1412 of the sealing base 1410.

The bearing bush 1440 is inserted into the bearing hole 1412 to support the rotating shaft 1340 in the journal direction, and is bent from the journal bearing part 1441 to form the bearing hole ( A thrust bearing portion 1442 mounted on the front end surface of the 1412 and slidingly contacting the upper surface of the rotor 130 to support in the thrust direction may be formed.

Here, the bearing bush 1440 may be installed in the bearing hole 1433 of the sealing cover 1430 as well as the bearing hole 1412 of the sealing base 1410. In addition, a lubrication storage unit 1422 for storing lubricant may be formed in the bearing hole 1421 of the sealing member 1420.

The sealing member 1420 is in contact with the outer circumferential surface of the rotating shaft 1340 at least three points to form a lubrication portion 1422 and the lubrication portion 1422, the connecting portion extending laterally from the lubrication portion (1423) 1424 and a sealing portion 1425 formed at the radial end of the connecting portion 1424 and in contact with the rotor accommodating groove 1111 to seal the rotor accommodating groove 1111.

Here, although not shown in the drawings, in place of the sealer as described above may be formed by protruding in a radial direction a rotor support protrusion that can support the rotor in the rotor receiving groove of the first housing in the axial direction. In this case, since the wash water or dirt may penetrate, the rotor is preferably manufactured in a completely sealed shape. In this case, the cost of the drain pump can be reduced, but washing water or dirt may flow into the rotor accommodating groove to lower the efficiency of the drain pump.

Meanwhile, the impeller 200 includes a boss portion 210, a plurality of blade portions 220, and a flange portion 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.

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, the second sealing protrusion 1434 is formed to be inserted into the first sealing protrusion 2323, and the water flow hole 2311 of the flange portion 230 has the first sealing protrusion 2323. At least a portion of the second sealing protrusion 1434 may be formed to include a water flowing into the rear surface of the flange 230 so that water may easily exit the impeller front through the water flow hole 2311. Can be.

In the drawings, reference numeral 1116 denotes a lubrication storage portion, 1119 and 1122 are connector insertion grooves, 1123 and 1124 are support protrusions, 1130 is a first bearing bush, 1131 is a first journal bearing portion, and 1132 is first 1 thrust bearing part, 1211 is a slit, 1240 is a connector, 1331 is a lubrication storage part, 1332 is a first through hole for magnetization, and 1333 is a second through hole for magnet identification.

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.

As the sealer 140 is provided outside the rotor accommodating groove 1111, that is, between the rotor 130 and the impeller 200, the rotor 130 may be stably supported. In addition, the washing water or dirt can be prevented from entering the rotor accommodating groove 1111 to effectively prevent the washing water or the dirt from entering the rotor 130.

The impeller 200 is formed on the rear surface of the impeller 200 and the front surface of the sealer 140 corresponding to the first sealing protrusion 2312 and the second sealing protrusion 1434 to form a double wall. The rotation of the washing water and dirt can be prevented from flowing into the back of the impeller 200, the driving of the impeller can be stabilized.

On the other hand, the Bieldich motor and a drain pump having the same according to the present invention may be installed in a drain pipe of a washing machine or a 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
1110: first housing 1111: rotor accommodating groove
1114: restraint groove 1120: second housing
1340: rotating shaft 1410: sealing base
1411: first coupling protrusion 1412: bearing hole
1413: air vent 1420: sealing member
1430: sealing cover 1431: restraining protrusion
1432: second coupling protrusion 1433: bearing hole
1434: second sealing protrusion 1440: bearing bush

Claims (13)

A housing in which the rotor accommodating groove is formed;
A stator inserted into an outer circumferential surface of the rotor accommodating groove and fixedly installed in the housing; And
And a rotor inserted into the rotor accommodating groove and rotatably installed on the outside of the housing.
The outside of the rotor is a Bieldish motor is provided with a sealer (sealer) to cover the rotor receiving groove. The method of claim 1, wherein the sealer,
A base rotatably coupled to the rotation shaft;
A sealing member coupled to the base and having an outer circumferential surface thereof contacting the inner circumferential surface of the rotor accommodation groove; And
And a cover coupled to the base such that the sealing member is fixed to the base. The method of claim 2,
On one side of the base and one side of the cover corresponding to the coupling protrusions are formed to be inserted and coupled to each other, the Bieldish motor is fixed by interposing the sealing member between the coupling protrusions. The method of claim 3,
Bieldi motor is formed on the other side of the base to the interval protrusion to maintain a predetermined distance with the rotor. The method of claim 2,
The base is a Bildish motor is formed at least one through-hole. The method of claim 2,
The base is formed of a bearing hole through which the rotating shaft penetrates, the bearing hole is a Bildish motor is provided. The method of claim 6, wherein the bearing bush,
A journal bearing portion inserted into the bearing hole to support the rotating shaft in a journal direction; And
And a thrust bearing portion bent from the journal bearing portion to be mounted on the front end surface of the bearing hole and in sliding contact with the rotor to support the rotating shaft in the thrust direction. The method of claim 2,
Bildish motor is formed on the inner peripheral surface of the rotor receiving groove stepped to limit the mounting depth of the sealer. The method of claim 2,
Constraining grooves are formed in the inner circumferential surface of the rotor accommodating groove along the circumferential direction, and at least one of the outer circumferential surface of the base and the outer circumferential surface of the cover is inserted into the constraining groove so that the sealer is constrained in the axial direction. Bildish motor become. A drainage motor coupled to a sump in which water is collected to generate one-way or two-way rotational force; And
And an impeller coupled to a rotation shaft of the drain motor to discharge water accumulated in the sump while rotating in one or two directions.
The drain motor is a drain pump is provided with a Bildish motor according to any one of claims 1 to 8. The method of claim 10,
A drainage pump is formed in the axial one side of the sealer to form a sealing protrusion to protrude in the rear direction of the impeller. The method of claim 11,
A drain pump having a sealing protrusion formed on a rear surface of the impeller to form a double sealing wall with the sealing protrusion of the sealer. The method of claim 12,
The sealing protrusion of the sealer and the sealing protrusion of the impeller drainage pump is formed in an annular shape.

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