KR101738455B1 - Brushless dc motor and drarin pump having the same - Google Patents

Abstract

The present invention relates to a non-Diesel motor and a drain pump having the same. Since the rotor is installed on the outside of the housing while the stator is coupled to the inside of the sealed housing, it is possible to effectively prevent the washing water or the dirt from entering the housing of the drain pump, thereby improving the performance of the motor and the pump. . In addition, since the sealer is provided outside the rotor receiving groove, the rotor can be stably supported, and washing water or dirt can be prevented from entering the rotor receiving groove and entering the rotor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a BD motor and a drain pump using the BD motor,

The present invention relates to a non-Diesel motor and a drain pump using the same, and more particularly, to a non-Diesel motor in which a stator is installed inside a housing and a rotor is installed outside a housing and a drain pump using the same.

Generally, 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, so that a magnetic field formed in the stator and a magnetic field of the permanent magnet It is a type of DC motor that obtains rotational force by action.

That is, according to the position of the rotor, the VDD motor applies a control signal to the power drive module to flow the appropriate current to the three-phase coil of the stator, thereby generating the torque by the interaction of the magnetic field of the rotor and the magnetic field caused by the current applied to the stator .

Such a BIEDYCYCENT motor has advantages of DC motor such as ease of operation and ease of controlling the rotation speed, and it is used in various fields by reducing the noise and the maintenance cost by eliminating the disadvantage of the DC motor.

For example, BI Dishmotor is also used in drainage pumps for washing machines or dishwashers. In the case of the drain pump, since the impeller must be operated under the condition that the water is filled, the degree of sealing of the driving unit must be maintained tightly, and at the same time, the rotation shaft must be smoothly lubricated during the rotation of the rotary shaft.

However, the conventional VDD motor has a limitation in increasing the degree of sealing as the stator and the rotor are disposed together in the same space, i.e., inside the housing. In other words, when the BDD is used as a drain pump, the impeller must be coupled to the rotary shaft of the rotor, so that the rotary shaft must be drawn to the outside of the housing. Accordingly, the housing is formed with a shaft hole through which the rotary shaft is drawn out to the outside. However, it is not easy to seal the shaft hole closely, and when the shaft hole is tightly sealed, the efficiency of the motor Could be lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bi-diesel motor capable of reducing the frictional loss of a rotary shaft while having a high degree of sealing.

In order to achieve the object of the present invention, there is provided a rotor comprising: a rotor core in which a plurality of magnets are embedded along a circumferential direction; A rotating shaft axially coupled to the center of the rotor core; And a molding cover surrounding the rotor core such that the rotating shaft passes through the molding cover.

A drain motor coupled to a sump where water is collected to generate a one-way or two-way rotational force; And an impeller coupled to a rotation shaft of the drain motor to discharge water tapped to the sump while rotating in one or both directions, wherein the drain motor includes a plurality of magnets embedded in the circumferential direction; A rotating shaft axially coupled to the center of the rotor core; And a molding cover that surrounds the rotor core so that the rotating shaft passes therethrough.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is provided a VDD motor and a drain pump having the same, wherein the stator is housed in the housing, while the rotor is installed outside the housing to effectively prevent washing water or dirt from entering the housing of the drain pump The performance of the motor and the pump can be improved.

In addition, since the sealer is provided outside the rotor receiving groove, the rotor can be stably supported, and washing water or dirt can be prevented from flowing into the rotor receiving groove, so that washing water or dirt penetrates into the rotor Can be effectively prevented.

1 is a longitudinal sectional view schematically showing a dishwasher to which a drain pump having a BD motor is applied,
FIG. 2 is an exploded perspective view showing a driving unit of the dish washer according to FIG. 1,
FIG. 3 is a plan view showing the dishwasher cooperative driving unit according to FIG. 1,
FIG. 4 is a perspective view of a drain pump applied to a dishwasher according to the present invention,
5 and 6 are a perspective view and a longitudinal sectional view of the drain pump shown in FIG. 4,
FIG. 7 is a perspective view of the rotor of the drain pump shown in FIG. 4,
Figure 8 is a top view of the rotor according to Figure 7,
9 is a sectional view taken along line II of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a longitudinal sectional view schematically showing a dishwasher to which a drain pump having a BD 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, FIG. 2 is a plan view showing a washing machine cooperating part.

Referring to FIG. 1, a water collecting device 1 is installed inside the dishwasher. The upper and lower connection pipes 2.3 and 2.3 are connected to the water collecting device 1 and the upper and lower fluid distributing pipes 2.3 and 5 respectively.

The upper and lower dispersing rocks 4 and 5 are rotatably installed on the upper part of the water collecting device 1. [ A plurality of spray holes (not shown) are formed in the upper and lower sprayer arms 4, The injection hole is formed so that the washing water can be injected obliquely.

An upper rack 6 is provided on the upper portion of the upper jet mill 4 and a lower rack 7 is provided on the upper portion of the lower jet mill 5. The upper rack (6) and the lower rack (7) are formed so as to contain tableware.

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

A predetermined space is formed in the sump 11 to collect wash water therein. A washing motor 12 for supplying washing water, a flow path switching motor 13 for selectively opening or closing the main flow paths 22 and 23 to be described later, and a drain pump 17 are installed. A heater 14 is installed inside the sump 11 to heat washing water. A filtering housing 20 is installed on the heater 14.

A washing impeller 15 is installed at a lower portion of the filtering housing 20 to rotate and rotate with the washing motor 12. As the washing motor 12 is operated, the washing impeller 15 is rotated, and the washing water collected in the sump 11 is pumped into the filtering housing 20.

A valve 16 is provided in the filtering housing 20 and the valve 16 is axially coupled to the flow path switching motor 13. [

A filtering panel 27 is installed on the upper portion of the filtering housing 20. The filtering panel is formed in a disk shape as a whole and covers the upper end of the sump 11. [ A plurality of drain holes 28 are formed in the rim of the filtering panel and a filter 29 having a predetermined mesh is installed at the center of the drain hole 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 drain hole 28 is formed outside the dirt chamber 26. The drain hole 28 collects wash water away from the upper / lower racks 6 and 7 into the sump 11 and allows the filtered wash water to be collected in the sump 11 to be recovered.

Dirt is filtered into the filter 29. The filter 29 is sprayed with washing water from the lower spray sand 5 installed on the filtering panel 27 as shown in FIG.

The washing water inlet 21 is formed in the filtering housing 20 so that the washing water pumped by the washing impeller 15 flows into the filtering housing 20.

Two main flow passages 22 and 23, which are passages for guiding the washing water to the respective spray guns 5 and 6, are branched into the washing water inflow portion 21. The main flow channels 22 and 23 are connected to the upper / lower connection pipe 2.3.

A sampling passage 24 is formed in the washing water inlet 21 to allow a portion of the pumped washing water to be introduced and a dirt chamber 26 is formed to be connected to the sampling passage 24.

The sampling flow path 24 is provided with a contamination level sensor 25 for measuring contamination of washing water. The pollution level sensor 25 measures pollution degree of the washing water by the light emitting unit and the light receiving unit.

The washing water flowing into the sampling flow path (24) flows into the dirt chamber (26). The washing water in the dirt chamber 26 is overflowed and dirt contained in the washing water is filtered. The filtered wash water flows back into the sump 11 through the drain hole 28 of the filtering panel.

A drain port 26a is formed in a predetermined portion of the dirt chamber 26. [ The drain hole 26a protrudes downward by a predetermined length relative to the bottom surface of the filtering housing 20 and is located in the drainage chamber 18 to be described later when assembled.

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

The dishwasher as described above is operated as follows.

That is, the dishwasher may clean the dish while sequentially or selectively performing preliminary washing, main washing, rinsing, heated rinsing and drying steps. Between each of these strokes, the drainage stroke is performed using the drainage pump. Hereinafter, the present cleaning process will be described.

As the washing motor 12 is rotated, the washing impeller 15 rotates to pump wash water (including detergent) of the sump 11 to the filtering housing 20, The washing water flows into the washing water inflow portion 21 of the filtering housing 20.

As the flow path switching motor 13 is rotated, the valve 16 opens and closes the two main flow paths 22 and 23 selectively or simultaneously. At this time, a part of the washing water is selectively or simultaneously introduced into the upper spray arm 4 and the lower spray arm 5 through the main flow channels 22 and 23. At the same time, the remaining part of the washing water flows into the dirt chamber 26 through the sampling flow path 24. The washing water after washing the tableware falls to the filtering panel 27 and the washing water is recovered to the sump 11 through the drain hole 28 of the filtering panel 27.

When the tableware is placed on the upper and lower racks 6 and 7 and simultaneously cleaned, the valve is rotated to open both of the two main flow paths 22 and 23, and flows into the washing water inflow part 21 The washing water is simultaneously supplied to the upper and lower spraying arms 4 and 5 to simultaneously clean the tableware housed in the upper rack 6 and the lower rack 7.

On the other hand, when the tableware is placed only on the upper rack 6 or the lower rack 7 and only the tableware of one rack is cleaned, the valve 16 is connected to the main flow passage 23 connected to the lower spraying rock 5 And is rotated so as to close the main flow passage 22 which is rotated to be closed or connected to the upper spray sand 4. The washing water introduced into the washing water inflow part 21 is supplied only to the upper spray arm 4 or the lower spray arm 5 to selectively clean the tableware housed in the upper rack 6 or the lower rack 7.

Meanwhile, the remaining part of the washing water flows into the dirt chamber 26 through the sampling flow path 24, and the contamination level sensor 25 measures the degree of contamination of the washing water and transmits information about the contamination degree to the control unit. And opens and closes the drain hole 26a of the dirt chamber 26 according to the degree of contamination.

The washing water in the sampling flow path 24 flows into the dirt chamber 26 via the contamination level sensor 25 and the washing water overflows through the filter 29 located above the dirt chamber 26. At this time, the filter 29 filters the 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 the washing process progresses for a predetermined time, an increasing amount of food waste accumulates in the dirt chamber 26. Then the washing stroke is completed and the drainage stroke is started.

That is, when the drain pump 17 is operated, the washing water of the sump 11 flows into the dirt chamber 26 by the suction force of the drain pump 17, and the dirt water is collected in the dirt chamber 26 The waste water and the washing water in the drainage chamber 18 are discharged to the outside through the drain pipe 19 and the drainage hose 9. [

As described above, since the drain pump is installed in the drainage chamber filled with the wash water, the drain pump always operates in a state of being submerged in the wash water. Therefore, in the drain pump, the efficiency of the pump can be increased by preventing the washing water from flowing into the inside of the pump.

FIG. 4 is a perspective view showing a drain pump applied to the dishwasher according to the present invention in an exploded state, FIG. 5 is a perspective view showing a drain pump according to FIG. Fig. 7 is a perspective view of the rotor in a drain pump according to Fig. 4, Fig. 8 is a plan view of the rotor of Fig. 7, and Fig. 9 is a sectional view taken along line II of Fig.

4 to 6, a drain pump 17 according to the present invention includes a drain motor 100 coupled to a drain chamber 18 of the sump 11 to generate a rotational force in one or both directions, And a drain side impeller (hereinafter abbreviated as an impeller) 200 which is shaft-coupled to the rotation shaft 1340 of the drain motor 100 to discharge the washing water while rotating.

The drain motor 100 is provided with a stator 120 in a housing 110 having a sealed inner space and a rotor 130 is rotatably installed outside the housing 110. That is, since the stator 120 and the rotor 130 are separately installed inside and outside the housing 110, the drainage motor 100 can effectively prevent washing water or dirt from entering the stator 120.

The housing 110 includes a first housing 1110 having a rotor receiving groove 1111 formed at one side thereof and an opening at the other side thereof and a second housing 1110 having an opening surface thereof to cover the opening surface of the first housing 1110, And a second housing 1120 detachably coupled to the first housing 1110 so that an inner space in which the first housing 120 is installed is sealed.

(Not shown) of a pump case (not shown) coupled to the drainage chamber 18 on one side of the first housing 1110, that is, on the outer side facing the drainage chamber 18 A plurality of fastening protrusions (101) are formed along the circumferential direction. A rotor receiving groove 1111 having a predetermined depth in the direction of the second housing is formed at the center of the outer surface of the first housing 1110 so that a rotor 130 to be described later can be inserted. The rotor receiving groove 1111 is formed in a shape that is closed at one side in the axial direction, but opened at the other side, that is, in a direction opposite to the drain chamber 18.

A stator 120 is inserted and fixedly coupled to the outer circumferential surface of the rotor receiving groove 1111, that is, the inner space of the housing 110. A rotor 130 is rotatably inserted into the rotor receiving groove 1111. [ do. Therefore, the stator 120 and the rotor 130 are disposed inside and outside the housing 110, respectively, and the rotor 130 is disposed in the axial height direction of the stator 120.

At least one or more anti-rotation ribs (not shown) are provided on the outer circumferential surface of the rotor receiving groove 1111 to prevent the stator 120 from moving in the circumferential direction by being positioned between the slots 1211 of the stator core 1210, Are formed at predetermined intervals along the circumferential direction. A sealer 140 to be described later is formed on the inner circumferential surface of the rotor accommodating groove 1111 in a stepped manner on a seating surface 1113 on which a sealer 140 to be described later is seated. The restricting protrusion 1431 is inserted and constrained in the axial direction.

A bearing groove 1115 is formed in the center of the bottom surface of the rotor receiving groove 1111 so that the end of the rotating shaft 1340 of the rotor 130 can be inserted.

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 in the circumferential direction in a cylindrical shape and the coils 1220 are inserted into the slots 1211 of the stator core 1210 And the insulator 1230 is interposed between the stator core 1210 and the coil 1220 to perform insulation. A substrate (not shown) for motor control is fixedly mounted on one side of the insulator 1230, and a connector 1240 is electrically connected to the substrate.

7 to 9, the rotor 130 includes a rotor core 1310, a plurality of magnets 1320, a molding cover 1330 surrounding the rotor core 1310 and the magnets 1320, And a rotating shaft 1340 which is integrally coupled to the rotor core 1310.

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 formed by magnet mounting grooves 1312 formed in the rotor core 1310, And the molding cover 1330 is formed by molding and molding the outer circumferential surface of the rotor core 1310 so as to support the magnets 1320 in the axial direction. The rotation shaft 1340 is integrally coupled to the rotor core 1310 and coupled to the molding cover 1330.

The rotor core 1310 has a shaft hole 1311 formed at a center of rotation thereof and a plurality of magnet mounting grooves 1312 are formed in the circumferential direction around the shaft hole 1311. The magnet mounting grooves 1312 are equally spaced along the circumferential direction within the same radius around the shaft yoke 1311. A plurality of magnetization holes 1313 are formed at regular intervals along the circumferential direction within the same radius as the inside of the magnet mounting groove 1312, that is, about the shaft hole 1311. The magnetization holes 1313 are formed to be about half the number of the magnets 1320, and one magnetization hole 1313 is formed to be arranged for two magnets. And the magnetization hole 1313 is formed so as to be located at the center of one of the two magnets.

The magnet 1320 is formed in a rectangular parallelepiped shape and inserted into the magnet mounting groove 1312 of the rotor core 1310 and fixed by the molding cover 1330 in the axial direction.

The molding cover 1330 is formed of an insulating material such as resin. The molding cover 1330 is molded using a predetermined mold so that the magnet 1320 is enclosed in the magnet mounting groove 1312 of the rotor core 1310. A lubricant storage portion 1331 is formed at a portion of the molding cover 1330 corresponding to the shaft hole 1311 of the rotor core 1310 so as to receive a predetermined amount of lubricant around the outer circumferential surface of the rotating shaft 1340 do. The lubricant storage portion 1331 is formed to be larger than the outer diameter of the rotation shaft 1340.

The molding cover 1330 is formed with a first through hole 1332 corresponding to the magnetizing hole 1313 of the rotor core 1310 and the outer side of the magnetizing hole 1313, A second through hole 1333 for heat dissipation is formed at a position corresponding to the magnet mounting groove 1312 of the magnet mounting groove 1312 to observe whether or not the magnet 1320 has been inserted into the magnet mounting groove 1312 without releasing. The first through hole 1332 is formed to be about 1/2 of the number of the second through holes 1333 like the magnetizing hole 1313.

The rotation shaft 1340 is formed of a metal material and the end of the rotation shaft 1340 is curved so as to prevent the wear of the housing 110. In addition, it is preferable that the bottom surface of the shaft groove 1115 is curved so as to prevent abrasion with the rotary shaft 1340.

It is desirable to insert a bearing bush 1130 made of metal into the bearing groove 1115 to reduce the frictional loss of the rotation shaft 1340. The bearing bush 1130 includes a journal bearing portion 1131 inserted in the bearing groove 1115 to support the rotation shaft 1340 in the journal direction and a bearing bushing 1131 bent in the journal bearing portion 1131, And a thrust bearing portion 1132 slidably contacting the rear surface of the rotor 130 and supported in the thrust direction.

Meanwhile, the rotor 130 is prevented from being detached from the rotor receiving recess 1111 between the rotor 130 and the impeller 200, and the washing water is supplied to the rotor 130 from the rotor 130, A sealer 140 may be provided to prevent penetration of the liquid.

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

The sealing base 1410 is rotatably coupled to a rotating shaft 1340 of the rotor 130 so that the outer circumferential surface of the sealing member 1420 is in contact with the inner circumferential surface of the rotor receiving groove 1111, And 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 rigid material molded by resin while the sealing member 1420 is formed of a material having elasticity such as rubber.

An annular restraining protrusion 1431 is formed 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 figure). The restricting projection 1431 is inserted into a restricting groove 1114 formed in an annular shape on the inner peripheral surface of the rotor receiving groove 1111 to prevent the rotor 130 and the sealer 140 from being separated from the housing 110 .

Here, although not shown in the drawings, a rotor supporting protrusion that can support the rotor in the axial direction may be formed in the rotor receiving groove of the first housing in a radial direction instead of the sealer. In this case, it is preferable that the rotor is formed in a completely sealed shape since washing water or dirt may penetrate. In this case, the cost of the drain pump can be reduced, but the washing water or the dirt may flow into the rotor receiving groove and the efficiency of the drain pump may be relatively decreased.

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 rotation shaft 1340 of the drain motor 100 and the blade portion 220 extends radially from the outer circumferential surface of the boss portion 210. The flange portion 230 is connected to the blade portion 210, (Not shown).

Reference numerals 1116 and 1122 denote connector insertion grooves. Reference numerals 1123 and 1124 denote supporting protrusions. Numeral 1240 denotes a connector. Reference numeral 1434 denotes a first sealing protrusion to be described later. 1442 is a second thrust bearing part; 1442 is a second thrust bearing part; 2311 is a water passage hole; 2312 is a second sealing projection part that protrudes toward the impeller; And a first sealing projection protruding from the back face of the flange toward the rotor to form a double wall.

The process of assembling the drain pump according to the present invention is as follows.

That is, the stator 120 is inserted into the outer circumferential surface of the rotor receiving 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 axially hooked on the hook protrusion 1117 of the first housing 1110 to prevent it from being detached.

Next, the sealer 140 and the impeller 200 are inserted into the rotary shaft 1340 of the rotor 130 in order.

Next, the module in which the rotor 130, the sealer 140, and the impeller 200 are coupled is inserted into the rotor accommodating groove 1111 of the first housing 1110 and engaged. Since the upper surface of the sealer 140 is visible to the outside of the flange 230 of the impeller 200 during the flat projection of the impeller 200, the operator presses the sealer 140 so that the restraining protrusion 1431 of the sealer 140 Is inserted into the restricting groove 1114 of the rotor receiving groove 1111 so as to be confined in the axial direction.

Next, the fastening protrusion 101 of the drain pump 17 is inserted into the fastening groove (not shown) of the pump case (not shown) to be coupled. At this time, the operator grasps the guide ribs 1118 provided on the housing 110 of the drain pump 17 and turns the guide ribs.

The operation and effect of the drain pump according to the present invention are as follows.

That is, when power is applied to the coil 1220 of the stator 120 by the start of the drainage stroke, the coil 1220 of the stator 120 and the rotor 1320 of the rotor 130 are rotated The impeller 200 coupled to the rotating shaft 1340 of the rotor 130 rotates while the rotor 130 rotates so that the washing water and the dirt collected in the sump 11, Is pumped into the drainage chamber (18) and discharged to the outside through the drainage hose (9).

At this time, the rotor 130 rotates in one direction or alternately in both directions depending on the direction of current supplied to the stator 120. That is, when the impeller 200 is not impregnated with foreign matter, the rotor 130 rotates only in one direction to continuously discharge the washing water for a predetermined period of time. However, when foreign matter is impinged on the impeller 200, a load is rapidly increased in the drain motor 100, so that a bidirectional current is supplied to the stator 120 so that the rotor 130 and the impeller 200 are temporarily The impurities discharged from the impeller 200 are removed while the forward rotation and the reverse rotation are repeated.

In the process of rotating the rotor 130 and the impeller 200, the washing water impinges the impeller 200 in both axial directions. However, when the rotor 130 and the impeller 200 move finely in the axial direction, So that the drain pump can smoothly discharge the washing water and the dirt.

In this way, the stator 120 is coupled to the interior of the sealed housing 110 while the rotor 130 is installed outside the housing 110. The impeller 200 exposed to the inside of the drainage chamber 18 is installed on the outside of the housing 100 of the drainage pump 17 together with the rotor 130 so that washing water or dirt is discharged from the housing of the drainage pump 17 100 from flowing into the inside of the housing. Accordingly, it is possible to prevent the stator 120 from coming into contact with water, thereby improving the performance of the motor and the pump.

The sealer 140 is provided between the rotor 130 and the impeller 200 outside the rotor receiving groove 1111 so that the rotor can be stably supported, It is possible to effectively prevent the inflow of washing water or dirt into the rotor 130 by blocking the inflow of the washing water into the rotor receiving groove 1111.

Meanwhile, although not shown in the drawings, the BID motor and the drain pump having the same according to the present invention may be installed in a drain pipe of a washing machine or a dehydrator. Even in this case, the basic structure and operation effects of the drain pump are similar to those in the dishwasher, so a detailed description thereof will be omitted.

11: Sump 17: Drain pump
100: drain motor 110: housing
120: stator 130: rotor
140: Sealer 200: Impeller
1111: rotor receiving groove 1114: confining groove
1115: Bearing groove 1130: Bearing bush
1310: rotor core 1311: football yoke
1312: magnet mounting groove 1313: magnetizing hole
1320: Magnet 1330: Molding cover
1331: lubrication storage part 1332: first through hole
1333: second through hole 1340: rotating shaft

Claims (15)

delete delete delete delete delete delete delete delete delete delete delete A drain motor coupled to a sump where water is collected to generate a one-way or two-way rotational force; A drain motor coupled to a sump to collect the articles and generate a one-way or two-way rotational force; And
A plurality of blades protruding radially from an outer circumferential surface of the boss portion and a plurality of blade portions extending radially from one axial end of the boss portion to connect the blades to each other, And an impeller including a flange portion in which at least one through hole is formed between the portions, the impeller being rotated in one direction or both directions to discharge the tapped water to the sump,
A first sealing ring portion is formed on a rear surface of the flange portion toward the rotor,
A second sealing protrusion is formed on one side of the drain pump facing the impeller toward the impeller so as to form a double wall with the first sealing protrusion,
The drain motor
A housing having a rotor receiving groove in which one side is closed and the other side is opened;
A stator inserted into an outer circumferential surface of the rotor receiving groove and fixed to the inside of the housing;
A rotor inserted into the rotor receiving groove and rotatably installed outside the housing;
And a sealer provided on an opening side of the rotor receiving groove to cover the rotor receiving groove,
The rotor may include:
Wherein a plurality of magnet mounting grooves are formed along the circumferential direction on the outer side of the shaft hole, and a magnet is embedded in each of the magnet mounting grooves;
A rotating shaft coupled to the yoke shaft of the rotor core in the axial direction; And
And a molding cover covering the rotor core to support the magnet so that the rotating shaft passes through the molding cover,
The rotor core and the molding cover are formed with a plurality of first through holes axially extending along the circumferential direction,
A plurality of second through holes are formed on at least one side of both sides in the axial direction of the molding cover so that at least a part of each of the magnets overlaps and at least a part of each of the magnets is exposed,
Wherein the number of the first through holes is n / 2 of the number n of the magnets, and the second through holes are formed to be equal to the number n of the magnets, The drain pump is formed smaller than the ball. 13. The method of claim 12,
Wherein the molding cover is formed with a lubrication storage portion to be spaced apart from an outer circumferential surface of the rotary shaft to receive a lubricant,
Wherein the lubrication storage portion is formed to be larger than the outer diameter of the rotating shaft. 13. The method of claim 12,
Wherein the first through holes are formed at equal intervals in the same radius around the rotation axis. 13. The method of claim 12,
Wherein the first through hole is formed to be positioned within a circumferential length of the magnet.

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