WO2017131392A1

WO2017131392A1 - Drain pump and washing apparatus including same

Info

Publication number: WO2017131392A1
Application number: PCT/KR2017/000697
Authority: WO
Inventors: 박지훈; 정보선
Original assignee: 엘지전자 주식회사
Priority date: 2016-01-27
Filing date: 2017-01-20
Publication date: 2017-08-03
Also published as: KR102518815B1; KR20170089709A

Abstract

The present invention relates to a drain pump and a washing apparatus including the same and, more specifically, to a drain pump improved so as to reduce noise, and a washing apparatus including the same. To this end, provided is the washing apparatus comprising a tub in which washing water is accommodated, a drum rotatably accommodated inside the tub, and the drain pump for draining the washing water inside the tub, wherein the drain pump includes: an impeller for forcibly discharging the washing water; a housing in which the impeller is rotatably provided; an inlet pipe communicating with the housing so as to allow the washing water in the tub to flow into the housing; an outlet pipe communicating with the housing so as to allow the washing water inside the housing to be discharged; and a communicating part for guiding, to the inlet pipe, the washing water inside the outlet pipe.

Description

Drainage pump and laundry machine including the same

The present invention relates to a drainage pump and a washing apparatus including the same, and more particularly, to an improved drainage pump and a washing apparatus including the same to reduce noise.

In general, a laundry machine is a device for washing laundry by rotating a cylindrical drum containing laundry and washing water. The drum is placed horizontally, and when the drum rotates in a forward / reverse direction with respect to the horizontal axis, the laundry moves upward along the inner circumferential surface of the drum. The drum-loading device of the front loading method, which is a method of washing laundry by being raised and dropped, and the drum having a pulsator disposed thereon vertically are placed to separate the laundry by the flow of water generated when the pulsator rotates in the forward and reverse directions. It is divided into a washing machine of a top loading method of washing.

Such a washing apparatus includes a cabinet forming an exterior, a cylindrical tub installed inside the cabinet and containing a wash water, and a drum rotatably installed in the tub. The laundry is rotated after the laundry is put into the drum to be washed. It is formed to be made.

In addition, the washing apparatus is provided with a water supply device for supplying the wash water to the tank and a drainage device for discharging the wash water to the outside after washing. The drainage device includes a drain hose for guiding water to be discharged from the tank to the outside, and a drain pump disposed under the tank to generate a pumping force so that the wash water is discharged to the outside along the drain hose.

The drain pump is formed with a pump casing and the impeller is mounted. When the draining process is in full swing, a sufficient load of the washing water is supplied to the pump casing so that a constant load acts on the drain motor.

However, in the situation where most of the water is drained and the sufficient amount of water is not supplied to the pump room, the load on the drain motor is changed and the drain motor operates unstable, thereby causing a large operation noise of the drain pump. .

In addition, the drain hose is connected to the drain pump to discharge the wash water to the outside is connected to the discharge hole formed at a position higher than the drain pump. When the output of the drain pump is gradually reduced to a certain point during the operation of the drain pump completely stopped, the output of the impeller is low enough to discharge the washing water remaining in the drain hose. At this time, the wash water flows back along the drain hose, and there is a problem of generating noise while colliding with the rotating impeller.

The present invention is to solve the above problems, it is an object of the present invention to provide an improved drainage pump and a washing apparatus including the same to reduce the noise.

In order to achieve the above object, the present invention is a washing machine including a tub in which the wash water is accommodated, a drum rotatably received in the tub and a drain pump for draining the wash water in the tub, wherein the drainage The pump includes an impeller for forcibly discharging the wash water; A housing in which the impeller is rotatably provided; An inlet pipe communicating with the housing such that the wash water in the tub flows into the housing; A water outlet tube communicating with the housing to discharge the wash water inside the housing; And a communicating unit for guiding the washing water inside the water outlet tube to the water inlet tube.

The communication unit may communicate with the inlet pipe; And a second communication tube communicating with the water outlet tube.

The communication unit may further include a connection tube connecting the first and second communication tubes.

The inlet pipe may have one side of the cross section communicating with the outlet tube and the other side of the cross section communicating with the inside of the housing.

The communication unit may be provided on one side of the cross section of the water inlet so that the wash water flows back from the water outlet tube to the water inlet tube.

The communication unit partition wall is provided on one side of the cross section of the water inlet; And a communication hole formed in the partition wall.

The inlet pipe may be provided with a cross-sectional extension on the other side of the cross section of the inlet pipe in order to prevent a decrease in the amount of wash water flowing into the housing.

The communication unit partition wall formed in the water inlet; And a communication hole formed in the partition wall.

The inlet pipe is connected to the edge side of the housing while being arranged side by side with a predetermined distance apart from the rotation axis of the impeller, the partition wall is provided between the space between the impeller and the inner peripheral surface of the housing and the inlet pipe Can be.

The inlet pipe may be provided with a cross-sectional extension at one end connected to the housing to prevent a reduction in the amount of wash water flowing into the housing.

The communicating unit may be provided on a path through which the wash water is discharged through the water discharge pipe.

The communicating unit may be provided spaced apart from the path through which the wash water is discharged through the water discharge pipe.

In addition, the impeller for forced discharge of water; A housing in which the impeller is rotatably provided; An inlet pipe communicating with the housing such that water is introduced into the housing; A water outlet tube communicating with the housing such that water in the housing is discharged; It can achieve the object by providing a drain pump comprising a; and a communication unit for guiding the water in the water outlet pipe to the water inlet pipe.

The communication unit may include a first communication tube communicating with the water supply pipe such that the washing water flows back from the water supply pipe to the water supply pipe; And a second communication tube communicating with the water outlet tube.

The water inlet pipe communicates with the water outlet pipe through a part of the cross section, and communicates with the inside of the housing through the remaining part of the cross section, wherein the communication portion is provided on a part of the cross section of the water inlet pipe; And a communication hole formed in the partition wall.

The water inlet pipe is provided with a cross-sectional extension part for extending the cross section of the water inlet pipe in the remaining part of the cross-section of the water inlet pipe to prevent a decrease in the amount of wash water flowing into the housing. The side and the housing can be in communication.

The inlet pipe is connected to the edge side of the housing so that the center line passing through the center of the cross section of the inlet pipe and the rotation axis of the impeller are spaced apart from each other by a predetermined distance and arranged side by side, the partition wall of the impeller and the housing A space formed between inner circumferential surfaces and may be provided to block the inside of the water inlet pipe.

The inlet pipe may be provided with a cross-sectional extension for extending the cross section of one end of the inlet pipe connected to the housing in order to prevent a reduction in the amount of wash water flowing into the housing.

The cross-sectional extension may be provided on the opposite side to the communication portion.

As described above, the drainage pump of the present invention and a washing apparatus including the same have the following effects.

First, it provides an effect of reducing the operating noise generated by not supplying sufficient wash water to the pump room of the drain pump.

Secondly, the output of the drain pump is gradually reduced to allow the backwashing water to flow into the inlet pipe instead of the pump room during the operation of the drainage pump completely, preventing the backwashing water from colliding with the impeller that has not stopped rotating. It provides the effect of reducing the

1 is a cross-sectional view schematically showing the configuration of a washing apparatus according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating the drain pump illustrated in FIG. 1.

3 is a perspective view showing a pump casing according to an embodiment of the present invention.

4 is a cross-sectional view showing the pump casing shown in FIG. 3.

5 is a perspective view showing a pump casing according to another embodiment of the present invention.

6 is a cross-sectional view showing the pump casing shown in FIG. 5.

7 is a perspective view showing a pump casing according to another embodiment of the present invention.

8 is a cross-sectional view showing the pump casing shown in FIG. 7.

9 is a perspective view showing a pump casing according to another embodiment of the present invention.

10 is a cross-sectional view showing the pump casing shown in FIG. 9.

11 is a perspective view showing a pump casing according to another embodiment of the present invention.

12 is a cross-sectional view illustrating the pump casing shown in FIG. 11.

Embodiments described below are shown by way of example in order to help understanding of the invention, it should be understood that the present invention may be modified in various ways different from the embodiments described herein. However, in the following description of the present invention, if it is determined that the detailed description of the related known functions or components may unnecessarily obscure the gist of the present invention, the detailed description and the detailed illustration will be omitted. In addition, the accompanying drawings may be exaggerated in some of the dimensions of the components rather than being drawn to scale to facilitate understanding of the invention.

The first and second terms used in the present application may be used to describe various components, but the components should not be limited by the terms. The terms are used only to distinguish one component from another component.

Also, the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the scope. Singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprise" or "consist" in the present application are intended to indicate that there is a feature, number, step, action, component, component, or combination thereof described in the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, a drain pump and a washing apparatus including the same according to various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing the configuration of a drum washing apparatus 1 according to an embodiment of the present invention. 1, the drum washing apparatus 1 according to an embodiment of the present invention, the cabinet 10, the door 13 is installed to open and close the laundry inlet 11 of the cabinet 10, the cabinet 10 ) Is connected to the tub 30 installed to store the wash water therein, the motor 50 installed on the tub 30 to generate a driving force, the rotary shaft 55 connected to the motor 50, and the rotary shaft 55. It includes a drum 40 for washing the laundry by the driving force transmitted from the motor (50).

In FIG. 1, the motor 50 is directly connected to the rotation shaft 55 to be a direct drive structure for driving the drum 40, but is not necessarily limited thereto.

The cabinet 10 forms an exterior of the drum washing apparatus 1, and a laundry inlet 11 is formed on the front thereof to communicate the inside and the outside thereof. The cabinet 10 is rotatably provided at the front of the door 13 to selectively open and close the laundry inlet 11. Accordingly, the user can put the laundry into the drum 40 by opening and closing the door 13 or remove the laundry from the drum 40.

Here, the door 13 is formed by the inner surface of the door facing the drum 40 protrudes toward the drum 40. Accordingly, when the user pushes the door 13 to close the door 13, a part of the inner surface of the door 13 is located inside the drum 40, and the laundry is washed only in the drum 40, and the drum 40 rotates. When washing, it is not discharged to the outside of the drum 40.

The tub 30 is formed to accommodate the wash water while being provided in the cabinet 10. Tub 30 is the wash water is supplied to the inside from an external water supply. In addition, the tub 30 is formed in a substantially cylindrical shape. The front opening is formed in the front of the tub at a position corresponding to the laundry inlet 11 of the cabinet 10 to communicate the inside and the outside of the drum 40.

The tub 30 is elastically supported by a spring 21 and a damper 23 whose circumferential surface is installed in the cabinet 10. In addition, the tub 30 cannot be rotated by itself because the circumferential surface is directly supported by the spring 21 and the damper 23. Thus, the tub 30 does not receive a separate rotational force from the motor 50, unlike the drum 40.

The upper side of the tub 30 is connected to a water supply device for supplying clean water that does not contain water or detergent included in the tub 30. The water supply device includes a water supply valve 61 for intermittent clean water supplied through an external hose, a water supply hose 62 for guiding water passing through the water supply valve 61, and water supplied through the water supply hose 62 in advance. One end is provided to guide the inside of the tub 30 with detergent supply device 63 formed to be mixed with the stored detergent, water containing detergent discharged from the detergent supply device 63 or clean water without detergent included therein. The water supply pipe 64 is connected to the outlet of the detergent supply device 63 and the other end is connected to the upper portion of the tub (30). Meanwhile, in the present embodiment, the water supply pipe is described as being composed of a single water supply pipe, but is not limited thereto.

In addition, a drainage device for draining water is connected to the lower side of the tub 30. The drainage device is a drain pump 71 providing power for discharging the wash water contained in the tub 30, one end of which is connected to the lower side of the tub and the other end of which is connected to the drain pump 71, and the laundry contained in the tub 30. A first drain pipe 73 for guiding water to the drain pump 71, a second drain pipe 75 having one end connected to the drain pump 71 and extending substantially horizontally to the other end toward the rear of the cabinet 10; It extends vertically and one end is connected to the second drain pipe and the other end is connected to the rear of the cabinet 10 includes a third drain pipe 77 for discharging the wash water to the outside of the cabinet (10). The first drain pipe 73 may be formed of a bellows pipe so that vibration of the tub 30 is not transmitted to the drain pump 71.

On the other hand, the tub 30 is the front surface 33 is spaced apart from the front of the cabinet 10 by a predetermined distance between the door 13 and the front opening of the tub 30, that is, the front of the cabinet 10 and the tub ( Washing water may flow between the front openings of 30). Gasket 15 is provided between the front of the cabinet 10 and the front opening of the tub 30 in order to prevent the wash water from entering. The gasket 15 is made of a flexible material so that vibration of the motor 50 is not transmitted to the cabinet 10 through the tub 30 and the gasket 15.

The gasket 15 includes a door side portion 151 and a tub side portion 152. In FIG. 1, the tub 30 side portion is concave, but is not limited thereto.

The drum 40 is formed in a substantially cylindrical shape and is formed to be loaded with laundry while being rotatably provided in the tub 30.

The drum 40 is directly connected to the rotating shaft 55, the rear surface 15 is connected to the motor 50 receives a rotational force from the motor 50. In addition, the drum 40 is provided with a lifter 49 on the inner circumferential surface of the drum 40 to lift and drop a part of the laundry or the wash water accommodated therein during rotation by the motor 50. Accordingly, when the drum 40 rotates by the motor 50, the lifter 49 rotates together with the drum 40 to lift and drop a part of the laundry or the wash water to one side.

The drum 40 has a plurality of through holes 47 formed in the side wall, that is, the window surface. The drum 40 communicates with the tub 30 through the plurality of through holes 47. Accordingly, when the wash water is supplied to the tub 30 at a predetermined level or more, the drum 40 is immersed in the wash water and some wash water is introduced into the drum 40 through the through hole 47.

On the other hand, the drain pump 71 is described herein as being used in the washing apparatus, but is not limited thereto and may be used in other washing apparatuses such as dishwashers. In addition, the washing water used herein does not mean only the washing water used in the washing apparatus, but may be used in a wide concept including general water. In addition, the backflow used in the present specification means an operation in which the wash water inside the inlet pipe to be described later is guided back to the inlet pipe from the pump room or back to the inlet pipe from the pump room, and must be in the same path as the path where the wash water has moved. It doesn't just mean moving back.

Hereinafter, the drain pump 71 will be described with reference to FIG. 2. FIG. 2 is an exploded perspective view illustrating the drain pump 71 according to the exemplary embodiment shown in FIG. 1.

Referring to FIG. 2, the drain pump 71 includes a driving unit 700 and a pump casing 100.

The driving part 700 is coupled to the rotor at one end of the drain motor casing 740 and the drain motor casing 740 having a drain motor (not shown) including a stator (not shown) and a rotor (not shown) therein. And an impeller 710 that rotates with the rotor.

The impeller 710 includes a hub 711 located at the center and a plurality of blades 712 extending radially from the outer circumferential surface of the hub 711.

The drain motor casing 740 has a plurality of engaging portions 730 engaged with the protrusions 115 (see FIG. 3) of the pump casing 100, which will be described later, at the edge of one end to which the impeller 710 is coupled. As the protrusion 115 is rotated and fitted into the locking part 730, the drain motor casing 740 is coupled to the pump casing 100.

The pump casing 100 is coupled to one end of the driving unit 700, and one end of the pump casing 100 is formed so that the washing water in the tub 110 and the housing 110 in which the impeller 710 is rotatably received are introduced into the housing 110. 1 is connected to the drain pipe (73) and the other end of the water inlet pipe 130, the wash water in the housing 110, one end is in communication with the housing 110 so that the other end of the second drain pipe (75) And a communicating unit 170 for guiding the water flowing into the water supply pipe 150 and the housing 110 introduced into the water supply pipe 130. The pump casing 100 may be formed as a separate component, but is not limited thereto. The pump casing 100 may be integrally formed at one lower side of the cabinet.

The communication unit 170 performs a function of reducing noise generated by the drainage motor. In other words, if most of the washing water is drained and a sufficient amount of water is not supplied to the pump chamber 113, which will be described later, the load applied to the drain motor is changed, and the drain motor operates unstable, thereby operating noise of the drain pump 71. This happens greatly. At this time, the communication unit 170 flows back a portion of the wash water in the housing 110 to the inlet pipe 130 to perform a function to reduce the noise by maintaining a minimum load of the drain motor.

In addition, when the output of the drain pump 71 is gradually reduced to a certain point during the operation of the drain pump is completely stopped, the washing of the output of the drain pump 710 remaining in the second and third drain pipes (75, 77) The water is lowered to the point where it cannot be discharged by pushing the water to a higher position than the drain pump 71. At this time, the wash water flows back along the second and third drain pipes 75 and 77 and generates noise while colliding with the rotating impeller 710. In this case, the communication unit 170 performs the function of reducing the noise by allowing the wash water in the water outlet pipe 150 to directly flow into the water inlet pipe 130 without passing through the impeller 710.

The communication unit 170 performing such a function may be formed in various phenomena on one side of the pump casing 100. Hereinafter, the pump casing 100 according to various embodiments in which the communicating unit 170 is formed will be described in detail with reference to the drawings.

3 is a perspective view illustrating a pump casing 100 according to an embodiment of the present invention illustrated in FIG. 2, and FIG. 4 is a cross-sectional view illustrating the pump casing 100 illustrated in FIG. 3.

3 and 4, the pump casing 100 includes a housing 110 having a pump chamber 113 in which an impeller 710 is rotatably received, and washing water in the tub 30 flows into the housing 110. One end is connected to the first drain pipe 73 so that the other end is in contact with the housing 110, one end is in communication with the housing 110 so that the wash water in the housing 110 is discharged and the other end is the second end. The communication unit 170 provided in the water inlet pipe 130 and the water outlet pipe 150 to guide the water inlet pipe 150 and the washing water introduced into the housing 110 to the water inlet pipe 130 connected to the drain pipe 75. ).

The housing 110 has an inlet hole 111 formed at one side such that the wash water is introduced from the inlet tube 130, and the outlet hole 112 is disposed so that the wash water obtained from the inlet tube 130 is discharged to the outlet tube 150. It is formed on the other side. The above-mentioned inlet 111 performs the same function as the

inlet

211, 311, 411, 511 of the pump casing according to another embodiment to be described later, the above-mentioned outlet 112 is in another embodiment to be described later Performs the same function as the outlet holes 212, 312, 412, 512 of the pump casing according.

The housing 110 has a flange 114 formed on the outer circumferential surface, and formed at regular intervals on the outer circumferential surface of the flange 114 so that the protrusion 115 can engage with the engaging portion 730 of the drain motor casing 740 described above. do. The housing 110 is formed on the outer circumferential surface of the flange 114 such that the stopper 116 interferes with one side surface of the catching portion 730 of the drain pump case, and the wave can be easily rotated so that the user can easily rotate the pump casing 100. Branch 117 is formed on the outer circumferential surface of the flange 114. In addition, the housing 110 has a coupling portion 118 that fixes the pump casing 100 to the lower side of the cabinet 10 on one side.

The communication unit 170 communicates with the water inlet tube 130 so that the washing water discharged from the water outlet tube 150 through the housing 110 flows back into the water inlet tube 130. And a second communication tube 172 in communication with. Inlet pipe 130 has a first communication hole 131 is formed on one side so that the wash water flows from the first communication tube 171, the outlet tube 150 is a second communication so that the wash water is discharged to the second communication tube 172. Ball 151 is formed on one side.

The first communication tube 171 and the second communication tube 172 may be connected to each other by a connecting tube 173, but is not limited thereto, at least one of the first communication tube 171 and the second communication tube 172 is extended to each other. Can be connected. In addition, although the first and

second communication pipes

171 and 172 are formed in the water inlet pipe 130 and the water outlet pipe 150, respectively, the present invention is not limited thereto, and a plurality may be formed.

Hereinafter, with reference to Figures 3 and 4 will be described the operation of the drain pump including a pump casing 100 according to an embodiment of the present invention.

When the drainage operation of the washing apparatus starts, the wash water in the tub 30 passes through the first drain pipe 73 and the water inlet pipe 130, that is, the pump chamber 113 inside the housing 110 of the pump casing 100. Flows into).

The wash water introduced into the pump chamber 113 is forcibly discharged to the water outlet pipe 150 by the impeller 710. The wash water discharged to the discharge pipe 150 is discharged to the outside of the cabinet along the second drain pipe 75 and the third drain pipe 77.

At this time, since the difference between the pressure inside the water inlet pipe 130 and the pressure in the water outlet pipe 150 is small, the washing water is hardly flowed back through the communication unit 170. In addition, when such a drainage process is in full swing, since a sufficient amount of washing water is supplied to the pump chamber 113, the load applied to the drainage motor is kept constant so that operation noise of the drainage pump does not occur significantly.

However, at the end of the drainage, a sufficient amount of washing water is not supplied to the pump chamber 113, and the pressure inside the inlet pipe 130 is lowered such that the wash water and the air flow into the inlet pipe 130 together. Accordingly, a part of the washing water discharged by the impeller 710 in the pump chamber 113 flows back and is obtained through the outlet pipe 150, the second communication pipe 172, the connection pipe 173, and the first communication pipe 171. It may be introduced into the tube 130. The backwashed water flows back into the pump chamber 113. Through such a circulation process, it is possible to alleviate the sudden change in the load applied to the drain motor, thereby reducing the noise due to unstable start of the drain motor.

On the other hand, since the third drain pipe 77 for discharging the wash water of the pump chamber 113 to the outside is connected to the discharge hole (not shown) formed in a position higher than the drain pump to remain in the third drain pipe 77 A force equal to the weight of the wash water acts against the pump chamber 113. Therefore, if the output of the drain pump is gradually reduced to stop the operation of the drain pump, the output of the drain pump reaches a point where the output of the drain pump becomes low enough to push up the washing water remaining in the third drain pipe 77. At this time, the wash water remaining in the third drain pipe (77) flows back along the second drain pipe (75) and the water discharge pipe (150), but a part of the second water is formed in the water discharge pipe (150) without being directly introduced into the pump chamber (113). Along the first communication tube 171 formed in the communication tube 172 and the water inlet tube 130, the water inlet tube 130 is again introduced into the pump chamber 113. The cleansing water that refills the pump chamber 113 is pushed in the direction opposite to the direction in which the washing water flowing back to the pump chamber 113 along the second drain pipe 75 and the water outlet pipe 150 is reversed. Accordingly, the quantity of the washing water introduced by the backflow into the pump chamber 113 is significantly reduced, and the quantity of the washing water colliding with the rotating impeller 710 is also significantly reduced while the noise caused by the collision with the impeller 710. Is reduced.

Hereinafter, a pump casing 200 according to another embodiment of the present invention will be described with reference to FIGS. 5 and 6. A configuration different from that of the pump casing 200 according to an embodiment of the present invention will be described, and descriptions of overlapping or identical configurations will be omitted.

5 is a perspective view illustrating a pump casing 200 according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view illustrating the pump casing 200 shown in FIG. 5.

5 and 6, the pump casing 200 is the housing 210, the water inlet pipe 230 and the water outlet pipe 212 communicated through the inlet hole 211 to the housing 210 is communicated through Including the 250, the outlet tube 250 is not only in communication with the housing 210 but also in communication with the outlet tube 250. Here, the housing 210 has a coupling portion 218 for fixing the pump casing 200 to the lower side of the cabinet 10 is formed on one side.

Inlet pipe 230 may be provided such that a portion of the cross section is connected to one side of the outlet pipe 250 and the other portion of the cross section is connected to the housing 210. That is, the inlet pipe 230 is in communication with both the outlet pipe 250 and the housing 210 as the central axis is not disposed on the same line as the central axis of the cylindrical housing 210 and spaced apart side by side.

The communication unit 270 is provided inside the water inlet pipe 230 and includes a partition 271 and a communication hole 272 formed in the partition 271.

The partition 271 is provided inside the water inlet pipe 230, and is provided over the entire cross-sectional area of the portion where the water outlet pipe 250 and the water inlet pipe 230 are connected to each other.

At least one communication hole 272 is formed in the barrier rib 271 so that the washing water in the discharge pipe 250 may flow back to the inlet pipe 230.

Here, the partition 271 is provided inside the water inlet pipe 230, and may be formed by a separate configuration from the pipe wall forming the water outlet pipe 250, but is not limited thereto. That is, the inlet pipe 230 is connected to one side of the pipe wall forming part of the outlet pipe 250, the partition wall 271 is the inlet pipe 230 of the pipe wall forming the outlet pipe 250 is connected It can consist of the pipe wall of the part. In this case, the communication hole 272 is formed of a hole formed in a part of the pipe wall forming the water discharge pipe 250.

On the other hand, the inlet pipe 230 is a part of the cross section is in communication with the outlet pipe 250, so that the remaining part of the cross section is in communication with the housing 210. Therefore, since the cross-sectional area of the connection portion of the inlet pipe 230 and the housing 210 is reduced than the cross-sectional area of the inlet pipe 230, the washing water is sufficient amount into the pump chamber 213 of the housing 210 through the inlet pipe 230. This may not flow.

In order to compensate for this point, the water supply pipe 230 may be provided with a cross-sectional extension 220 extending at one end thereof connected to the housing 210.

The cross-sectional extension part 220 is formed in a substantially cylindrical shape, and an expansion chamber 222 and a side opening 221 are formed at each side to provide a space therein so that water can pass therethrough. The cross-sectional extension part 220 is formed at one side of the inlet pipe 230 and communicates with the inlet pipe 230 through the side opening 221 and communicates with the housing 210 through the inlet hole of the housing 210. In this case, the cross-sectional extension 220 may be disposed such that the central axis passes through the center of the housing 210.

Accordingly, the cross-sectional area of the connection portion between the inlet pipe 230 and the housing 210 is prevented from being reduced, and the wash water can be smoothly supplied from the inlet pipe 230 to the pump chamber 213 of the housing 210.

Hereinafter, with reference to Figures 5 and 6 will be described the operation of the drain pump including a pump casing 200 according to another embodiment of the present invention. The operation of the drain pump including the pump casing 200 according to an embodiment of the present invention will be described with respect to other operations, and a description thereof will be briefly or omitted.

When the drainage operation of the washing apparatus starts, since the difference between the pressure in the water inlet pipe 230 and the pressure in the water outlet pipe 250 is small, the washing water hardly flows back through the communication unit 270. In addition, when such a drainage process is in full swing, since a sufficient amount of washing water is supplied to the pump chamber 213, the load applied to the drainage motor is kept constant so that the operation noise of the drainage pump 71 is not greatly generated.

At the end of the drainage, some of the wash water discharged by the impeller 710 from the pump chamber 213 may flow back to the water inlet pipe 230 through the water outlet pipe 250 and the communication unit 270. Unlike the pump casing 200 according to the embodiment of the present invention, since the length of the communication hole 272 of the communication unit 270 is very short, it occurs in the process of flowing into the water inlet pipe 230 from the water outlet pipe 250. Very low resistance

Similarly, when the output of the drain pump is gradually reduced, even when the wash water remaining in the third drain pipe 77 flows back along the second drain pipe 75 and the outlet pipe 250, the water is introduced into the inlet pipe 230 under low resistance. .

7 and 8, a drain pump including a pump casing 300 according to another embodiment of the present invention will be described. A configuration different from the pump casing 300 according to an embodiment of the present invention will be described, and descriptions of overlapping or identical configurations will be omitted.

FIG. 7 is a perspective view illustrating a pump casing 300 according to another embodiment of the present invention, and FIG. 8 is a cross-sectional view illustrating the pump casing 300 illustrated in FIG. 7.

7 and 8, the inlet pipe 330 communicates with the housing 310 through the inlet hole 311 with the longitudinal center axis spaced apart from the center of the housing 310 by a predetermined distance. That is, the inlet pipe 330 is connected to the edge side of the housing 310. The outlet pipe 350 communicates with the housing through the outlet hole 312.

The impeller 710 is accommodated inside the housing 310 such that the hub 711, that is, the rotating shaft passes through the center of the housing 310, has a predetermined space formed between the impeller 710 and the inner circumferential surface of the housing 310. .

The communication unit 370 is provided inside the water inlet pipe 330, but is provided between the impeller 710 and the inner circumferential surface of the housing 310 between the partition wall 317 and the partition wall 317. It includes a communication hole 372 formed in.

When viewed from the top of the housing 310 in the drawing, a part of the cross section of the inlet pipe 330 overlaps with a cross section of the impeller 710, and a part of the cross section of the inlet pipe 330 is provided with a partition 371 and an impeller 710. It does not overlap with the cross section. Accordingly, the wash water is supplied to the impeller 710 of the pump chamber 313 through a portion overlapping with the cross section of the impeller 710 of the water pipe 330.

7 and 8 will be described the operation of the drain pump including a pump casing 300 according to another embodiment of the present invention.

When the drainage operation of the washing apparatus starts, the wash water in the tub is introduced into the pump chamber inside the housing 310 of the pump casing 300, that is, the drainage pump 330. Washing water introduced into the pump chamber is forcibly discharged to the outlet pipe by the impeller (710). At this time, since the water pressures on both sides of the partition wall 317 are almost the same, the washing water hardly moves through the communication hole 372 of the partition wall 317.

At the end of drainage, a sufficient amount of washing water is not supplied to the pump chamber 313 and the pressure inside the water inlet pipe 330 is lowered. The wash water is discharged by the impeller 710 and then flows back to the water inlet pipe 330 through the communication hole 372 through a predetermined space between the impeller 710 and the inner circumferential surface of the housing 310. The wash water flowing back to the water inlet pipe 330 is introduced into the pump chamber 313 again.

Similarly, even when the output of the drain pump is gradually reduced to stop the drain pump, the wash water flows back through the communication hole 372 from a predetermined space between the impeller 710 and the inner circumferential surface of the housing 310 and flows into the inlet pipe 330. After that, the pump flows back into the pump chamber 313.

9 and 10, a drain pump including a pump casing 400 according to another embodiment of the present invention will be described. A configuration different from that of the pump casing 400 according to an embodiment of the present invention shown in FIGS. 7 and 8 will be described, and descriptions of overlapping or identical configurations will be omitted.

9 is a perspective view illustrating a pump casing 400 according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view illustrating the pump casing 400 illustrated in FIG. 9.

9 and 10, the communication unit 470 is formed as close as possible to the outlet pipe 450 so that the washing water flows back through the communication unit 470 more easily.

In detail, the inlet pipe 430 communicates with the housing 410 through the inlet hole 411 while the longitudinal center axis is spaced apart from the center of the housing 410 by a predetermined distance to the outlet pipe 450. That is, the water inlet pipe 430 is connected to the edge side of the housing 410 closest to the water outlet pipe 450 communicating with the housing 410 through the water outlet hole 412.

Like the pump casing 300 shown in FIGS. 7 and 8, the impeller 710 is accommodated inside the housing 410 such that the rotating shaft is disposed to pass through the center of the housing 410, and the impeller 710 and the housing 410 are provided. A constant space is formed between the inner circumferential surfaces of the.

The communication part 470 is made up of the partition wall 471 provided in the inner side of the water inlet pipe 430 and the communication hole 472 formed in the partition wall 471, so that the partition wall 471 is closest to the water outlet pipe 450. It is provided inside the water inlet pipe 430.

Accordingly, the communication unit 470 may be formed as close as possible to the water outlet pipe 450. In other words, the wash water communicating part 470 is provided on a path through which the water discharge pipe 450 is discharged.

On the other hand, the cross-sectional expansion portion 420 is provided with an expansion chamber 421 therein, is formed at one end of the inlet pipe 430 connected to the housing 410. The inlet pipe 430 is prevented from decreasing the cross-sectional area of the portion connected to the housing 410 by the partition wall 471 of the communication portion 470 by the cross-sectional expansion portion 420, the wash water is pump chamber 413 Can be supplied smoothly.

In addition, the cross-sectional extension part 420 may be provided such that the cross section of the water inlet pipe 430 including the cross-sectional extension part 420 overlaps with the entire cross section of the impeller 710 when viewed from the top of the housing 410 in the drawing. . This is because the washing water moving along the water inlet pipe 430 may be more smoothly supplied to the impeller 710 of the pump room 413. Therefore, the cross-sectional extension portion 420 is provided on one side of the water inlet pipe 430 may be provided on the opposite side to the side provided with the communication unit 470. For example, as shown in FIG. 9, the communication hole 472, the center of the inlet pipe 430 cross section, and the center of the cross-sectional extension part 420 are sequentially formed on the central axis XX of the outlet pipe 450. Can be arranged.

11 and 12, a pump casing 500 according to another embodiment of the present invention will be described. The pump casing 500 does not have a communication portion 570 including a partition 571 and a communication hole 572 formed in the partition 571 as close as possible to the water outlet 550. In other words, the wash water may be provided spaced apart from the path discharged through the water outlet pipe 550. Here, the outlet pipe 550 communicates with the housing 510 through the outlet hole 512.

As shown in FIG. 11, the communication hole 572 is not positioned on the central axis X-X of the outlet pipe 550, but spaced apart from the central axis X-X by a predetermined distance. In this case, the cross-sectional extension part 520 is provided with an expansion chamber 521 which provides a space therein to allow water to pass therethrough. In addition, as the cross-sectional extension part 520 is provided, the cross section of the water inlet pipe 530 overlaps the entire cross section of the impeller 710 when viewed from the top of the housing 510 in the drawing. The cross-sectional extension 520 is provided on one side of the inlet pipe 530 is provided on the opposite side to the side provided with the communication unit 570, the center of which is located on the central axis (XX) of the outlet pipe 550 Rather than the central axis (XX) is located a certain distance away from.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Claims

A washing apparatus including a tub in which washing water is received, a drum rotatably received in the tub, and a drain pump for draining the washing water in the tub, wherein the drain pump is provided.

An impeller for forcibly discharging the wash water;

A housing in which the impeller is rotatably provided;

An inlet pipe communicating with the housing such that the wash water in the tub flows into the housing;

A water outlet tube communicating with the housing to discharge the wash water inside the housing; And

And a communication unit for guiding the washing water inside the water outlet tube to the water inlet tube.
The method of claim 1,

The communication unit may communicate with the inlet pipe; And a second communication tube communicating with the water outlet tube.
The method of claim 2,

The communication unit further comprises a connection pipe connecting the first and second communication pipe.
The method of claim 1,

The inlet pipe has a washing machine, characterized in that one side of the cross-section communicates with the outlet tube and the other side of the cross-section communicates with the inside of the housing.
The method of claim 1,

The communication unit is washing machine, characterized in that the washing water is provided on one side of the cross section of the water inlet pipe to flow back from the water inlet pipe.
The method of claim 5,

The communication unit partition wall is provided on one side of the cross section of the water inlet; And a communicating hole formed in the partition wall.
The method of claim 6,

The inlet pipe is a washing apparatus, characterized in that the cross-sectional extension portion is provided on the other side of the cross section of the inlet pipe to prevent a decrease in the amount of wash water flowing into the housing.
The method of claim 1,

The communication unit partition wall formed in the water inlet; And a communicating hole formed in the partition wall.
The method of claim 8,

The water inlet pipe is connected to the edge side of the housing while being disposed side by side spaced apart by a predetermined distance from the rotation axis of the impeller,

The barrier rib is provided between a space formed between the impeller and the inner peripheral surface of the housing and the water supply pipe.
The method of claim 9,

The water inlet pipe is provided with a washing machine, characterized in that the cross-sectional extension is provided at one end connected to the housing in order to prevent a reduction in the amount of wash water flowing into the housing.
The method of claim 10,

Washing device, characterized in that the cross-sectional extension is provided on the opposite side to the communicating portion.
The method of claim 11,

The communication unit washing apparatus, characterized in that provided on the path for washing water is discharged through the discharge pipe.
The method of claim 11,

The communication unit washing apparatus, characterized in that the washing water is provided spaced from the discharge path through the discharge pipe.
An impeller forcibly discharging water;

A housing in which the impeller is rotatably provided;

An inlet pipe communicating with the housing such that water is introduced into the housing;

A water outlet tube communicating with the housing such that water in the housing is discharged; And

And a communication unit for guiding the water in the water outlet pipe to the water inlet pipe.
The method of claim 14,

The communicating part may include: a first communicating tube communicating with the inlet pipe such that water flows back from the outlet pipe to the inlet pipe; And a second communication pipe communicating with the water discharge pipe.
The method of claim 14,

The inlet pipe communicates with the outlet pipe through a portion of the cross section, and communicates with the interior of the housing through the remaining portion of the cross section.

The communication portion partition wall is provided in a portion of the cross section of the water inlet; And a communication hole formed in the partition wall.
The method of claim 16,

The water inlet pipe is provided with a cross-sectional extension portion for extending the cross section of the water inlet pipe to the remaining portion of the water inlet pipe section in order to prevent a decrease in the amount of wash water flowing into the housing,

The cross-sectional expansion portion drain pump characterized in that the communication between the side of the inlet pipe and the housing.
The method of claim 14,

The communication unit partition wall formed on the inner peripheral surface of the water inlet pipe; And a communication hole formed in the partition wall.
The method of claim 18,

The inlet pipe is connected to the edge side of the housing so that the center line passing through the center of the cross section of the inlet pipe and the rotation axis of the impeller are arranged side by side with a predetermined distance from each other,

The partition wall is a drain pump, characterized in that the space formed between the impeller and the inner circumferential surface of the housing and to block the inside of the water inlet.
The method of claim 19,

The inlet pipe is a drain pump having a cross-sectional extension to extend the cross section of one end of the inlet pipe connected to the housing in order to prevent a reduction in the amount of wash water flowing into the housing.
The method of claim 20,

The cross-sectional expansion portion is a drain pump, characterized in that provided on the opposite side to the communication portion.