JP2022131454A - Filtration device and washing machine - Google Patents

Abstract

To provide a filtration device and a washing machine including the filtration device which can provide improved maintainability through preventing clogging of a filter.SOLUTION: A filtration device 20 includes a case 21, a filter 23 placed in the case 21, a rotator 32 placed in the filter 23, and raking members 33 which are held by the rotator 32 in the filter 23. The filter 23 takes water flowing into the case 21 into the filter 23 itself through an inlet opening 25F and captures foreign objects contained in the water at its inner periphery 23A. The rotator 32 rotates due to momentum of water taken, through the inlet opening 25F, into the filter 23. A raking member 33 can slide between an advancing position in which it comes near to the inner periphery 23A and a withdrawing position in which it goes away from the inner periphery 23A, and it is biased towards the withdrawing position by a biasing member 49.SELECTED DRAWING: Figure 11

Description

The present invention relates to a filter device and a washing machine including the filter device.

The washing machine described in Patent Document 1 below includes a housing, a washing tub arranged in the housing, a drainage channel for discharging water in the washing tub to the outside of the housing, and a drainage filter attached to and detached from the drainage channel. including. The drainage filter includes a comb having a plurality of pins. When the drainage flowing through the drainage channel passes around the pins in the drainage filter, foreign matter contained in the drainage is trapped by the pins.

Japanese Patent Application Laid-Open No. 2020-103718

Since the drainage filter described in Patent Document 1 captures long foreign matter such as lint and hair, the clearance between adjacent pins in the comb portion, that is, the filter hole is relatively large, so the drainage filter is clogged. hard to do. On the other hand, in recent years, there is a growing demand for measures to prevent resin-made foreign substances with a size of several tens of micrometers, called microplastics, from being released into the natural world. In order to meet such demands, it is possible to make the filter holes smaller. is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter device capable of suppressing filter clogging and improving maintainability, and a washing machine including the filter device. and

The present invention is a case provided with an inlet and an outlet, wherein water in a drainage channel of a washing machine is allowed to flow into the case through the inlet and water in the case is allowed to flow out through the outlet. A filter provided with a case, a cylindrical inner peripheral surface portion having a longitudinally extending central axis, and a plurality of filter holes distributed in the inner peripheral surface portion, the filter being arranged in the case, An intake port is provided for taking water flowing into the case into the filter, and foreign matter contained in water flowing out of the filter through the filter hole after being taken into the filter through the intake port is removed. a filter that is captured by the inner peripheral surface portion; a rotating body that is disposed in the filter and rotates around the central axis due to the momentum of water taken into the filter through the intake port; A scraping member that is supported and scrapes foreign matter from the inner peripheral surface, wherein the scraping member moves between an advanced position approaching the inner peripheral surface and a retracted position away from the inner peripheral surface toward the central axis. The filter device includes a scraping member that is slidable in a radial direction with respect to an axis, and a biasing member that biases the scraping member toward the retracted position.

Further, in the present invention, the rotating body includes a vane for receiving water taken into the filter from the intake port, the vane being arranged above the lower half of the internal space of the filter, The inlet faces the blades in a circumferential direction around the central axis or in a tangential direction to the circumferential direction.

Moreover, the present invention is characterized in that the filter device includes a weight connected to the scraping member.

Further, according to the present invention, the filter is provided with an overflow hole for allowing water in the filter to overflow outside of the filter in a region above the filter hole, and the case is provided with an overflow hole away from the overflow hole. A recess is provided in the bottom, and the outlet is located directly below the overflow hole.

Further, the present invention includes a washing tub for storing laundry, an upstream channel connected to the washing tub, a drainage channel having a first downstream channel and a second downstream channel branched from the upstream channel, and the second 1 a drain valve that opens and closes a downstream flow path; a pump that is provided in the second downstream flow path and causes water in the upstream flow path to flow into the second downstream flow path; and said filter device provided in a remote downstream region.

According to the present invention, in the filter device, the water flowing through the drainage channel of the washing machine flows into the case from the inflow port and is taken into the filter from the intake port. and out of the filter and out of the washing machine through the outflow port of the case. When water flows out of the filter through the filter holes, foreign matter contained in the water is captured by the inner peripheral surface of the filter. When the rotating body arranged in the filter rotates due to the momentum of the water taken into the filter from the inlet, the scraping member supported by the rotating body resists the biasing force of the biasing member due to the centrifugal force. It advances from the retracted position to the advanced position and comes into contact with the foreign matter on the inner peripheral surface of the filter. As a result, the centrifugal force is reduced due to a temporary reduction in the rotation speed of the rotating body, so that the scraping member is retracted to the retreat position side by the biasing force of the biasing member. Then, when the rotation speed of the rotating body recovers and the centrifugal force increases, the scraping member advances to the advanced position again and contacts foreign matter on the inner peripheral surface of the filter. As described above, the scraping member repeatedly advances and retreats between the advanced position and the retracted position during the rotation of the rotating body accompanying drainage, and contacts the foreign matter on the inner peripheral surface of the filter many times. Foreign matter can be efficiently scraped off from the inner peripheral surface of the. As a result, clogging of the filter in the filter holes can be suppressed, and maintenance can be improved.

Further, according to the present invention, the blades included in the rotating body receive the water taken into the filter from the inlet, thereby rotating the rotating body. The blades are arranged above the lower half where water tends to accumulate in the internal space of the filter. Furthermore, the inlet faces the blades from the central axis of the inner peripheral surface of the filter, that is, from the circumferential direction around the rotation axis of the rotor, or from the direction tangential to this circumferential direction. As a result, the blades are less susceptible to the resistance of the water accumulated in the lower half of the internal space of the filter, while efficiently receiving the water taken into the filter through the intake port, so that the rotating body can be vigorously rotated. can. Therefore, a large centrifugal force is generated to facilitate the advance of the scraping member to the advanced position, so that the scraping member can more efficiently scrape the foreign matter from the inner peripheral surface of the filter. As a result, clogging of the filter in the filter holes can be further suppressed, and maintainability can be further improved.

Further, according to the present invention, the weight connected to the scraping member generates a large centrifugal force, which facilitates the scraping member to advance to the advanced position. Foreign matter can be efficiently scraped off. As a result, clogging of the filter in the filter holes can be further suppressed, and maintainability can be further improved.

Further, according to the present invention, even if the filter is clogged, the water in the filter overflows from the overflow hole to the outside of the filter and flows out of the case from the outflow port. can be discharged overboard. Furthermore, since a concave portion is provided in the case so as to be recessed away from the overflow hole, and the outflow port is arranged directly below the overflow hole, the water overflowing from the overflow hole to the outside of the filter can be quickly discharged from the concave portion to the outflow port. It can be delivered and discharged outside the aircraft.

Further, according to the present invention, in the drainage channel of the washing machine, the portion downstream of the upstream channel connected to the washing tub branches into the first downstream channel and the second downstream channel. A pump and filter device is provided in the second downstream flow path. When the pump is operated with the drain valve closing the first downstream channel, the water in the upstream channel flows through the second downstream channel and the foreign matter is caught by the filter device before being discharged out of the machine. When the amount of water in the washing tub is low and the pump tends to suck air, the pump may be stopped and the drain valve may be used to open the first downstream channel. Then, the remaining water flows from the upstream channel through the first downstream channel and is discharged outside the machine, so that the noise caused by the operation of the pump with air trapped therein can be suppressed, and the water in the washing tub can be reduced. It can be discharged outside the machine without any residue.

It is a typical longitudinal section right side view of a washing machine concerning one embodiment of this invention. It is a perspective view of the filter apparatus contained in a washing machine. It is a perspective view of a case included in the filter device. It is a perspective view of a filter unit included in the filter device. 4 is a perspective view of a filter included in the filter unit; FIG. FIG. 6 is a perspective view of the filter viewed from a direction different from that of FIG. 5; 4 is a perspective view of a cleaning unit included in the filter unit; FIG. It is a longitudinal cross-sectional view of a filter device. FIG. 9 is a cross-sectional view taken along line AA of FIG. 8; FIG. 9 is a cross-sectional view taken along the line BB in FIG. 8; FIG. 9 is a vertical cross-sectional view of the filter device cut at a position different from that of FIG. 8 ; FIG. 10 is a cross-sectional view showing a state in which the scraping member of the cleaning unit is in the advanced position at the same cutting position as in FIG. 9;

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional right side view of a washing machine 1 according to one embodiment of the present invention. 1 is called the horizontal direction X of the washing machine 1, the horizontal direction in FIG. 1 is called the front-back direction Y of the washing machine 1, and the vertical direction in FIG. In the horizontal direction X, the far side of the paper surface of FIG. 1 is called the left side X1, and the near side of the paper surface of FIG. 1 is called the right side X2. In the longitudinal direction Y, the left side in FIG. 1 is called the front side Y1, and the right side in FIG. 1 is called the rear side Y2. In the vertical direction Z, the upper side is called an upper side Z1, and the lower side is called a lower side Z2.

The washing machine 1 includes a vertical washing machine, a drum type washing machine, and a two-tub type washing machine, but below, a vertical washing machine that omits the drying function and executes only the washing operation is taken as an example. Next, the washing machine 1 will be explained. The washing machine 1 includes a housing 2 forming its outer shell, a washing tub 5 composed of an outer tub 3 and an inner tub 4 arranged in the housing 2, and a rotor 6 housed in the inner tub 4. , an electric motor 7 for generating torque for rotating the inner tank 4 and the rotor blades 6, and a transmission mechanism 8 for switching the transmission destination of the torque generated by the motor 7.

The housing 2 is made of metal, for example, and formed in a box shape. The upper surface 2A of the housing 2 is formed with an opening 2B that allows the inside and outside of the housing 2 to communicate with each other. A door 9 for opening and closing the opening 2B is provided on the upper surface 2A. On the upper surface 2A, for example, a display operation unit 10 configured by a touch panel or the like is provided in a region on the front side Y1 of the opening 2B. The display/operation unit may be divided into a display unit such as a liquid crystal panel and an operation unit such as switches and buttons.

The outer tub 3 is formed in a bottomed cylindrical shape with an opening 3A formed at the upper end. The outer tub 3 is connected to the housing 2 via a hanging rod 11, whereby the washing tub 5 is elastically supported. Opening 3A is arranged directly below opening 2B of housing 2 . Water is stored in the outer tank 3 . The washing machine 1 includes a drainage channel 12 for discharging water accumulated in the outer tub 3 to the outside of the washing machine 1 . The drainage channel 12 has an upstream channel 12A connected to the outer tank 3 from the lower side Z2, and a first downstream channel 12B and a second downstream channel 12C branched from the upstream channel 12A.

The first downstream passage 12B is pulled out of the machine. The second downstream flow path 12C merges with the first downstream flow path 12B within the housing 2 . A configuration relating to the second downstream flow path 12C will be described later. In the middle of the first downstream flow path 12B, a drain valve 13 is provided that is opened and closed to start and stop draining water from the outer tank 3, that is, draining the water. When the drain valve 13 opens, the first downstream flow path 12B is opened, so draining is started (see the solid line arrow in FIG. 1). Since the first downstream flow path 12B is closed when the drain valve 13 is closed, draining is stopped.

The inner tub 4 has a central axis J extending in the vertical direction Z, is formed in a cylindrical shape with a bottom that is one size smaller than the outer tub 3, and can accommodate laundry Q therein. An inlet/outlet 4A is formed at the upper end of the inner tank 4 . The inlet/outlet 4A communicates with the opening 3A of the outer tub 3 and the opening 2B of the housing 2 from the lower side Z2. A user of the washing machine 1 opens the door 9 to open the opening 2B, the opening 3A and the entrance 4A, and puts the laundry Q into and out of the inner tub 4. - 特許庁

The inner tank 4 is coaxially accommodated in the outer tank 3 and arranged along the vertical direction Z, that is, vertically. The inner tub 4 housed in the outer tub 3 is rotatable around the central axis J. As shown in FIG. A plurality of through holes (not shown) are formed in the inner tank 4, and the water in the outer tank 3 can flow between the outer tank 3 and the inner tank 4 via the through holes. The bottom wall of the inner tank 4 is provided with a tubular support shaft 14 that extends downward Z2 along the central axis J and penetrates the bottom wall of the outer tank 3 .

The rotor blade 6 is a so-called pulsator, is formed in a disc shape with the central axis J as the center of a circle, and is arranged on the bottom wall of the inner tank 4 . The rotary blade 6 is provided with a rotary shaft 15 extending from the center of the circle along the central axis J to the lower side Z2. The rotary shaft 15 is inserted through the hollow portion of the support shaft 14 , and the lower end of the rotary shaft 15 is positioned below the bottom wall of the outer tub 3 Z<b>2 .

The motor 7 has an output shaft 16 that protrudes upward Z1 and rotates about the central axis J, and is arranged below the inner tank 4 Z2. The transmission mechanism 8 is an electric clutch interposed between the lower ends of the support shaft 14 and the rotating shaft 15 and the upper end of the output shaft 16 . The transmission mechanism 8 selectively transmits torque output from the output shaft 16 by the motor 7 to one or both of the support shaft 14 and the rotating shaft 15 . When the torque is transmitted to the support shaft 14, the inner tank 4 rotates, and when the torque is transmitted to the rotating shaft 15, the rotor blades 6 rotate.

In relation to water supply to the outer tub 3 and the inner tub 4 , the washing machine 1 includes a water supply channel 17 for supplying tap water from a faucet (not shown) into the inner tub 4 . One end (not shown) of the water supply channel 17 is pulled out of the housing 2 and connected to a faucet. The other end of the water supply path 17 faces the inlet/outlet 4A of the inner tank 4 from the upper side Z1 as a water supply port 17A arranged in the housing 2 . A water supply valve 18 that can be opened and closed is provided in a portion of the water supply path 17 that is arranged inside the housing 2 .

Washing machine 1 includes control unit 19 configured by a microcomputer or the like. The control unit 19 is electrically connected to the motor 7 , the transmission mechanism 8 , the display operation unit 10 , the drain valve 13 and the water supply valve 18 . The operation content of the display operation unit 10 by the user is input to the control unit 19 , and the control unit 19 controls the display content of the display operation unit 10 . The control unit 19 controls the operation of the motor 7 , the transmission mechanism 8 , the drain valve 13 and the water supply valve 18 to perform the washing operation for washing the laundry Q in the washing tub 5 . The washing operation includes a washing process for washing the laundry Q in the inner tub 4 of the washing tub 5, a rinsing process for rinsing the laundry Q after the washing process, and a dewatering process for dehydrating the laundry Q after the rinsing process.

In the washing process, the controller 19 first supplies water into the washing tub 5 by opening the water supply valve 18 for a predetermined time while the drain valve 13 is closed (see the dashed arrow in FIG. 1). It should be noted that the controller 19 may supply the bath water into the washing tub 5 by operating a bath water pump (not shown) instead of opening the water supply valve 18 when water is supplied. Before or after supplying water, the user may open the door 9 and pour the detergent into the inner tub 4 through the entrance 4A.

When the water level in the washing tub 5 rises to a predetermined water level, the controller 19 stops the water supply and then controls the motor 7 and the transmission mechanism 8 to rotate the rotor blades 6 . As a result, the laundry Q in the inner tub 4 is washed by being agitated or being decomposed by the detergent. Finally, the control unit 19 drains the washing tub 5 by opening the drain valve 13 as part of the draining process.

In the rinsing process, the controller 19 first fills the washing tub 5 with tap water by opening the water supply valve 18 for a predetermined time while the drain valve 13 is closed. After supplying water, the controller 19 rotates the rotor blade 6 by controlling the motor 7 and the transmission mechanism 8 . Thereby, the laundry Q in the inner tub 4 is rinsed. In the rinsing process, the user may open the door 9 and put the softener into the inner tub 4 through the entrance 4A before or after supplying water. The softener permeates the laundry Q. Finally, the control unit 19 executes wastewater treatment.

In the dehydration process, the controller 19 rotates the inner tub 4 at a predetermined dehydration speed by controlling the motor 7 and the transmission mechanism 8 with the drain valve 13 open. As a result, the laundry Q in the inner tub 4 is dehydrated by centrifugal force.

Next, the configuration of the second downstream channel 12C of the drainage channel 12 will be described. The second downstream channel 12C has an upstream region 12CA connected to the branch position of the upstream channel 12A, and a downstream region 12CB farther from the branch position than the upstream region 12CA. The upstream area 12CA extends, for example, to the rear side Y2 from the branch position, then bends to the upper side Z1, and along the peripheral wall of the outer tank 3 in the space 2C on the rear side Y2 of the outer tank 3 in the housing 2, to the upper side Z1. Extend. In the space 2C, the downstream region 12CB is arranged, for example, on the rear side Y2 of the upstream region 12CA, extends downward Z2, and merges with the first downstream channel 12B.

Washing machine 1 includes an electric pump P provided in upstream area 12CA and a filter device 20 provided in downstream area 12CB. The filter device 20 captures foreign matter contained in water flowing from the upstream channel 12A to the second downstream channel 12C in the drainage channel 12 . Foreign matter that the filter device 20 captures is paper hair, lint, dust, and dirt. Note that dust and dirt also include fine dust such as microplastics. In addition, in the first downstream channel 12B of the drainage channel 12, no structure other than the drainage valve 13 is provided to restrict the flow of water.

Hereinafter, the orientation of the filter device 20 is specified using the left-right direction X, the front-back direction Y, and the up-down direction Z of the washing machine 1. Can be changed arbitrarily. The filter device 20 is arranged at the upper end of the space 2C inside the housing 2 . FIG. 2 is a perspective view of the filter device 20 viewed from the front side Y1. The filter device 20 includes a box-shaped case 21 forming its outer shell and a filter unit 22 most of which is accommodated within the case 21 .

FIG. 3 is a perspective view of the case 21 viewed from the front side Y1. The case 21 includes a semicircular bottom wall 21A that bulges toward the rear side Y2, a vertical wall 21B that rises from the front edge of the bottom wall 21A that extends in the left-right direction X, and an arc-shaped edge that rises from the bottom wall 21A. It integrally has a curved wall 21C that extends between the left and right ends of the vertical wall 21B. A space surrounded by the vertical wall 21B and the curved wall 21C and closed by the bottom wall 21A is an internal space 21D of the case 21 . The internal space 21D is opened to the upper side Z1 by a semicircular opening 21E bordered by the upper edges of the vertical wall 21B and the curved wall 21C.

A tubular outflow path 21F protruding downward Z2 is provided at a position on the right side of the front end of the bottom wall 21A. The internal space of the outflow path 21F is an outflow port 21G that communicates with the internal space 21D from the lower side Z2. A cylindrical inflow passage 21H protruding to the front side Y1 is provided at an upper left end portion of the front surface of the vertical wall 21B. The internal space of the inflow path 21H is an inflow port 21I communicating from the front side Y1 to the internal space 21D. A rib-shaped first engaging portion 21J extending in the left-right direction X is provided at the upper end portion of the front surface of the vertical wall 21B. A rib-shaped second engaging portion 21K extending in the left-right direction X while curving is provided at the upper end portion of the inner peripheral surface of the curved wall 21C facing the inner space 21D from the rear side Y2.

FIG. 4 is a perspective view of the filter unit 22 viewed from the front side Y1. Filter unit 22 includes filter 23 and cleaning unit 24 . 5 and 6, which are perspective views of the filter 23, the filter 23 has a cylindrical shape, specifically a cylindrical shape, having a cylindrical inner peripheral surface portion 23A having a central axis K extending in the vertical direction Z. It has an overall shape of Note that the outer peripheral surface 23B of the filter 23 may have a cylindrical shape similar to the inner peripheral surface portion 23A, or may have a square tubular shape.

The filter 23 includes a cylindrical frame 25 forming its outer shell and a mesh sheet 26 (see FIG. 6) attached to the frame 25 . 5, illustration of the mesh sheet 26 is omitted. Further, hereinafter, a radial direction based on the central axis K is referred to as a radial direction R, and a circumferential direction around the central axis K is referred to as a circumferential direction S. In the radial direction R, the direction approaching the center axis K is called the radial inside R1, and the direction away from the center axis K is called the radial outside R2.

The frame 25 integrally has a disk-shaped bottom wall 25A and a cylindrical circumferential wall 25B rising from the entire outer peripheral edge of the bottom wall 25A. A space surrounded by the circumferential wall 25B and blocked by the bottom wall 25A is an internal space 25C of the frame 25. As shown in FIG. The internal space 25C is also the internal space of the filter 23 . The internal space 25C opens to the upper side Z1 through a circular opening 25D bordered by the upper edge of the circumferential wall 25B. Approximately the center of the circumferential wall 25B in the vertical direction Z is provided with a circular tubular intermediate passage 25E that protrudes toward the front side Y1 along the tangential direction T to the circumferential direction S. As shown in FIG. The internal space of the relay path 25E is an intake port 25F that communicates from the tangential direction T with the internal space 25C.

A plurality of through holes 25G are formed in each of the bottom wall 25A and the circumferential wall 25B. Eight through-holes 25G formed in the bottom wall 25A are arranged at regular intervals in the circumferential direction S, and each through-hole 25G has an isosceles trapezoidal shape that widens in the circumferential direction S toward the radially outer side R2. It is formed. A plurality of through holes 25G formed in the circumferential wall 25B are distributed in a region avoiding the relay path 25E in the circumferential wall 25B, and each through hole 25G is formed in a rectangular shape with four rounded corners. .

The through holes 25G are arranged vertically in three tiers in the substantially front half region of the circumferential wall 25B, and arranged in two vertically tiers in the substantially rear half region of the circumferential wall 25B. Eight through-holes 25G are provided in the lowermost stage and are arranged at equal intervals over the entire area in the circumferential direction S of the lower end of the circumferential wall 25B. The uppermost through-hole 25G in the substantially rear half area of the circumferential wall 25B has the same size as the lowermost through-hole 25G and is provided in four, which are arranged in the circumferential direction S at equal intervals. The dimension in the vertical direction Z of the through hole 25G in the second stage from the top in the substantially front half region of the circumferential wall 25B is about half that of the through hole 25G in the lowest stage, and the through hole 25G in the second stage is Three of them are provided, arranged at the same height position as the relay path 25E, and arranged in the circumferential direction S at regular intervals. Four uppermost through holes 25G in the substantially front half area of the circumferential wall 25B are provided as the smallest overflow holes 25H in both the vertical direction Z and the circumferential direction S, and are arranged in the circumferential direction S at regular intervals. The upper end of the uppermost through hole 25G in the substantially rear half area of the circumferential wall 25B is arranged at the substantially same height position as the substantially center in the vertical direction Z of the overflow hole 25H.

Ribs 25I for reinforcing the frame 25 are provided on the lower surface of the bottom wall 25A at positions avoiding the through holes 25G and at positions avoiding the relay paths 25E and the through holes 25G on the outer peripheral surface of the circumferential wall 25B. The rib 25I extends in the circumferential direction S and the radial direction R on the lower surface of the bottom wall 25A (see FIG. 6), and extends in the vertical direction Z and the circumferential direction S on the outer peripheral surface of the circumferential wall 25B. An upper end portion of the circumferential wall 25B is provided with a flange 25J that protrudes radially outward R2 over substantially the entire circumferential direction S. As shown in FIG. Notches 25K formed by cutting the flange 25J in the vertical direction Z are provided at a plurality of positions spaced apart in the circumferential direction S on the flange 25J.

As shown in FIG. 6, the mesh sheet 26 is provided in all the through holes 25G other than the overflow hole 25H at the uppermost stage of the circumferential wall 25B, and blocks the through holes 25G to close the inner circumferential surface portion 23A of the filter 23 (see FIG. 6). 5). Each mesh sheet 26 is preferably curved along the circumferential direction S. Each mesh sheet 26 is formed with a large number of filter holes 26A, which are minute through holes. Therefore, a plurality of filter holes 26A are distributed in the inner peripheral surface portion 23A of the filter 23 . The overflow hole 25H is provided in a region Z1 above all the filter holes 26A in the filter 23 . Instead of the mesh sheet 26, a grid (not shown) integrally formed with the frame 25 may be provided. In this case, the gaps in the grid function as the filter holes 26A. The size of the filter hole 26A can be arbitrarily set, but is set to 10 to 20 μm when microplastics are to be captured, and is set to about 500 μm when microplastics are not to be captured.

FIG. 7 is a perspective view of the cleaning unit 24 viewed from the front side Y1. The cleaning unit 24 includes a lid 30, a shaft 31 extending downward Z2 from the lid 30, a rotor 32 rotatably supported by the shaft 31, a pair of scraping members 33 supported by the rotor 32, and a weight 34 connected to each scraping member 33 .

The lid 30 has a semicircular shape that is substantially the same in shape and size as the bottom wall 21A of the case 21 (see FIG. 3). A front edge extending in the left-right direction X of the lid 30 is provided with a third engaging portion 30A having a frame shape elongated in the left-right direction X and hanging down from the front edge.

The lower surface of the lid 30 is provided with an annular outer rib 30B that borders the outer periphery of the lid 30 and protrudes downward Z2. The outer rib 30</b>B has a semicircular outline that is one size smaller than the outer peripheral edge of the lid 30 . A claw-shaped fourth engaging portion 30C that protrudes downward Z2 and then bends rearward Y2 is provided on the arcuate edge of the outer rib 30B that protrudes toward the rear side Y2. A packing 35 edging the outer peripheral surface is attached to the outer peripheral surface of the outer rib 30B. An annular inner rib 30D protruding downward Z2 is provided in a region surrounded by the outer rib 30B on the lower surface of the lid 30. As shown in FIG. The lower ends of the inner ribs 30D are positioned higher than the lower ends of the outer ribs 30B, that is, the upper side Z1. A cylindrical support portion 30E projecting downward Z2 is provided on the lower surface of the lid 30 at a position coinciding with the center of the circle of the inner rib 30D.

FIG. 8 is a longitudinal sectional view of the filter device 20. FIG. The filter 23 is arranged inside the case 21, and the lid 30 is attached so as to cover the opening 21E of the case 21 and the opening 25D of the frame 25 of the filter 23 from the upper side Z1. By engaging the first engaging portion 21J of the case 21 with the third engaging portion 30A of the lid 30 and engaging the second engaging portion 21K of the case 21 with the fourth engaging portion 30C of the lid 30, The lid 30 is secured to prevent accidental removal (see FIG. 11).

On the lower surface of the lid 30, an outer rib 30B is sandwiched between the respective upper ends of the vertical wall 21B and the curved wall 21C of the case 21 and the upper end of the peripheral wall 25B of the frame 25 of the filter 23, and the peripheral wall 25B is sandwiched between an outer rib 30B and an inner rib 30D (see also FIG. 11). In this state, the inner rib 30D and the filter 23 are arranged coaxially, so the support portion 30E provided on the lower surface of the lid 30 is arranged on the central axis line K of the inner peripheral surface portion 23A of the filter 23. A cylindrical support portion 25L that protrudes upward Z1 is provided on the bottom wall 25A of the frame 25 of the filter 23 at a position that coincides with the central axis K. As shown in FIG.

A gap between the case 21 and the outer rib 30B is filled with a packing 35. - 特許庁A claw-shaped positioning portion 30F protruding radially inward R1 is provided on the inner peripheral surface of the outer rib 30B (see FIG. 11). The positioning portion 30F contacts the flange 25J of the upper end portion of the frame 25 from the lower side Z2, so that the filter 23 inside the case 21 is positioned with the bottom wall 25A of the frame 25 slightly floating from the bottom wall 21A of the case 21. be done. The user displaces the filter 23 in the circumferential direction S with respect to the lid 30 to align the positioning portion 30F with the notch 25K (see FIG. 5) of the flange 25J, and then removes the filter 23 from the lid 30 downward Z2. , the cleaning unit 24 can be disassembled and only the filter 23 can be removed. Below, the shaft 31, the rotating body 32, the scraping member 33, and the weight 34 will be described using the circumferential direction S and the radial direction R, with the cover 30 attached to the case 21 and the filter 23 as a reference.

The shaft 31 is, for example, a metal shaft, and is arranged on the central axis K in the filter 23 , that is, in the internal space 25C of the frame 25 of the filter 23 . The upper end of the shaft 31 is inserted through the support portion 30E of the lid 30 and the lower end thereof is inserted through the support portion 25L of the frame 25 of the filter 23 . In order to prevent the shaft 31 from coming off, a pair of upper and lower washers 36 are attached to the upper end portion of the shaft 31 so as to sandwich the support portion 30E. Another washer 37 is placed on the support 25L.

The rotating body 32 is arranged inside the filter 23 . The rotor 32 can be divided into an upper unit 40 and a lower unit 41 . 9 is a cross-sectional view taken along line AA of FIG. 8. FIG. The upper unit 40 includes a disk-shaped base 40A arranged coaxially with the central axis K, an upper cylindrical portion 40B projecting upward Z1 from the center of the circle on the upper surface of the base 40A, and an upper cylindrical portion on the upper surface of the base 40A. It integrally has a pair of upper guide portions 40C arranged to sandwich 40B. Further, the upper unit 40 integrally includes a lower cylindrical portion 40D protruding downward Z2 from the center of the circle on the lower surface of the base 40A, and a plurality of blades 40E arranged to surround the lower cylindrical portion 40D on the lower surface of the base 40A. (See FIG. 8).

At two locations separated by 180 degrees in the circumferential direction S on the outer peripheral edge of the base 40A, one recess 40F recessed radially inward R1 is formed. The pair of upper guide portions 40C are arranged on the same straight line extending in the radial direction R by being arranged at the same positions in the circumferential direction S as the respective recesses 40F. Each upper guide portion 40C is a hollow body elongated in the radial direction R extending from the upper cylindrical portion 40B to the recess 40F. The upper cylindrical portion 40B may be regarded as the radially inner R1 end portion of each upper guide portion 40C. Each upper guide portion 40C has an inner space 40G positioned radially inward R1, an outer space 40H positioned radially outward R2 from the inner space 40G, and an outer space 40H disposed between the inner space 40G and the outer space 40H. A partition wall 40I and an end wall 40J positioned radially outward R2 from the outer space 40H are provided.

The inner space 40G and the outer space 40H communicate with each other through a through hole 40K provided in the partition wall 40I. The outer space 40H opens radially outward R2 via a through hole 40L provided in the end wall 40J. The inner space 40G and the outer space 40H are open to the upper side Z1. The upper unit 40 further includes a pair of upper covers 42 corresponding to the pair of upper guide portions 40C. The upper cover 42 is longitudinal in the radial direction R, and both ends of the upper cover 42 in the circumferential direction S are bent downward Z2. The upper cover 42 is attached to the corresponding upper guide portion 40C, sandwiches the upper guide portion 40C from both sides in the circumferential direction S, and extends the inner space 40G and the outer space 40H, which are the internal spaces of the upper guide portion 40C, upward. Block from Z1 (see also FIG. 8). This prevents foreign matter from entering the inner space 40G and the outer space 40H. The upper cover 42 can be attached to and detached from the upper guide portion 40C by a known locking structure such as screwing or snap fitting.

The internal space of the upper cylindrical portion 40B and the internal space of the lower cylindrical portion 40D are in a continuous state to form an upper insertion hole 40M (see FIG. 8). The shaft 31 is inserted through the upper insertion hole 40M. As a result, the rotating body 32 as a whole is rotatable around the central axis K. As shown in FIG. Since the inner diameter of the upper cylindrical portion 40B is smaller than the inner diameter of the lower cylindrical portion 40D and substantially the same as the outer diameter of the shaft 31, the rotating body 32, especially the substantially upper half of the rotating body 32, rotates smoothly without rattling. can be done. A bearing (not shown) may be arranged between the inner peripheral surface of the upper insertion hole 40</b>M and the shaft 31 . The lower cylindrical portion 40D is provided with a locking hole 40N passing through the lower cylindrical portion 40D in the radial direction R (see FIGS. 7 and 8). In this embodiment, two locking holes 40N are provided at two locations separated by 180 degrees in the circumferential direction S, one each.

The blade 40E has a substantially rectangular plate shape when viewed in the circumferential direction S, is spaced radially outward R2 from the lower cylindrical portion 40D, and is connected to the outer peripheral edge of the base 40A (see FIG. 7). . Both corners in the radial direction R of the lower end of the blade 40E are rounded. In this embodiment, eight blades 40E are arranged side by side in the circumferential direction S at regular intervals. Each blade 40E is arranged at a different position in the circumferential direction S than the recess 40F of the base 40A and the upper guide portion 40C. Further, each vane 40E is arranged above the lower half of the internal space 25C of the frame 25 of the filter 23 (see FIG. 8).

As shown in FIG. 9, the overflow hole 25H of the frame 25 of the filter 23 is arranged around the connecting portion between the vertical wall 21B and the curved wall 21C of the case 21 in plan view. Since the connecting portion constitutes a corner of the case 21 in a plan view, a concave portion 21L recessed away from the overflow hole 25H is formed in the case 21. As shown in FIG. A pair of left and right recesses 21</b>L are present and form part of the internal space 21</b>D of the case 21 , particularly the gap 21</b>M between the filter 23 and the case 21 . A portion of the case 21 outside the overflow hole 25H in the circumferential direction S is arranged along the curved wall 21C, so the gap 21M in this portion is narrower in the radial direction R than the recess 21L. In addition, since the overflow hole 25H on the right end overlaps the outlet 21G of the bottom wall 21A of the case 21 in a plan view, the outlet 21G coincides directly below the overflow hole 25H, that is, on the lower side Z2 and in the circumferential direction S. placed in position.

10 is a cross-sectional view taken along line BB of FIG. 8. FIG. The inlet 25F of the frame 25 of the filter 23 is arranged at the same height position as the blades 40E in the filter 23, and faces the blades 40E from the circumferential direction S, strictly speaking, from the tangential direction T to the circumferential direction S. That is, the inlet 25F faces the blade 40E from the circumferential direction S or the tangential direction T. In addition, the inlet 21I of the case 21 is arranged along the tangential direction T along the inlet 25F and communicates with the inlet 25F.

FIG. 11 is a vertical cross-sectional view of the filter device 20 taken at a different position shifted by 180 degrees in the circumferential direction S from that of FIG. The lower unit 41 includes a cylindrical portion 41A arranged immediately below the upper cylindrical portion 40B of the upper unit 40, a locking portion 41B extending from the upper end of the cylindrical portion 41A to the upper side Z1, and a pair of cylindrical portions 41A sandwiched therebetween. is integrally provided with the lower guide portion 41C.

The inner space of the cylindrical portion 41A constitutes a lower insertion hole 41D. The shaft 31 is inserted through the lower insertion hole 41D. Since the inner diameter of the lower insertion hole 41D is approximately the same as the outer diameter of the shaft 31, the rotor 32, particularly the lower half of the rotor 32, can rotate smoothly without rattling. A bearing (not shown) may be arranged between the inner peripheral surface of the lower insertion hole 41</b>D and the shaft 31 .

The engaging portion 41B is inserted from the lower side Z2 into the inner space of the upper cylindrical portion 40B, ie, the upper insertion hole 40M, without contacting the shaft 31. As shown in FIG. A pair of claw portions 41E projecting in opposite directions to the radially outer side R2 are provided at the upper end portion of the locking portion 41B, and are locked to the locking holes 40N of the lower cylindrical portion 40D one by one (Fig. 7 and FIG. 8). Thereby, the lower unit 41 is connected to the upper unit 40 so as to be integrally rotatable. The locking portion 41B is provided with a positioning portion 41F that positions the lower unit 41 in the vertical direction Z with respect to the upper unit 40 by contacting the lower cylindrical portion 40D from the lower side Z2.

The pair of lower guide portions 41C are arranged on the same straight line extending in the radial direction R. As shown in FIG. Each lower guide portion 41C is a hollow body elongated from the cylindrical portion 41A to the radially outer side R2. The cylindrical portion 41A may be regarded as the radially inner R1 end portion of each lower guide portion 41C. Each lower guide portion 41</b>C is configured similarly to the upper guide portion 40</b>C of the upper unit 40 . That is, the pair of lower guide portions 41C are arranged at the same position in the circumferential direction S as the pair of upper guide portions 40C. Furthermore, each lower guide portion 41C has an inner space 41G positioned radially inward R1, an outer space 41H positioned radially outward R2 from the inner space 41G, and a space between the inner space 41G and the outer space 41H. An arranged partition wall 41I and an end wall 41J located radially outside R2 of the outer space 41H are provided.

The inner space 41G and the outer space 41H communicate with each other through a through hole 41K provided in the partition wall 41I. The outer space 41H opens radially outward R2 via a through hole 41L provided in the end wall 41J. The inner space 41G and the outer space 41H are open to the lower side Z2. The lower unit 41 further includes a pair of lower covers 43 corresponding to the lower guide portion 41C. The lower cover 43 is longitudinal in the radial direction R, and both ends of the lower cover 43 in the circumferential direction S are bent upward Z1. The lower cover 43 is attached to the corresponding lower guide portion 41C, and sandwiches the lower guide portion 41C from both sides in the circumferential direction S. Block from side Z2 (see FIG. 8). This prevents foreign matter from entering the inner space 41G and the outer space 41H. The lower cover 43 can be attached to and detached from the lower guide portion 41C by a known locking structure such as screwing or snap fitting.

A pair of scraping members 33 are present as described above in accordance with the pair of upper guide portion 40C and lower guide portion 41C. The scraping members 33 are arranged at two locations separated by 180 degrees in the circumferential direction S one by one. In addition, since the number of the scraping members 33 can be changed arbitrarily, the scraping member 33 may be singular or three or more may be provided and arranged at equal intervals in the circumferential direction S. Each scraping member 33 includes a total of two slide pins 45 arranged one by one in the internal spaces of the upper guide portion 40C and the lower guide portion 41C, and holders 47 fixed to the slide pins 45 via bolts 46. and a brush 48 provided on the holder 47 .

The slide pin 45 has a cylindrical shape extending in the radial direction R. As shown in FIG. Referring to the upper left slide pin 45 in FIG. 11 , an annular inner flange portion 45</b>A projecting from the outer peripheral surface of the slide pin 45 is provided at the radially inner R<b>1 end of the slide pin 45 . An annular outer flange portion 45B projecting from the outer peripheral surface of the slide pin 45 by one step is provided in the middle portion of the slide pin 45 in the radial direction R, that is, radially outward R2 from the inner flange portion 45A. The slide pin 45 is formed with a threaded hole 45C extending from the end surface of the radially outer side R2 to the outer flange portion 45B.

The slide pin 45 arranged in the internal space of the upper guide portion 40C is arranged across the inner space 40G and the outer space 40H of the upper guide portion 40C. In this slide pin 45, the inner flange portion 45A is arranged in the inner space 40G, and the outer flange portion 45B is arranged in the outer space 40H. This slide pin 45 is slidable in the radial direction R. As shown in FIG. When the slide pin 45 slides radially outward R2, the radially outer R2 end of the slide pin 45 can protrude radially outward R2 from the through hole 40L of the end wall 40J of the upper guide portion 40C. Since the outer flange portion 45B of the slide pin 45 faces the end wall 40J from the radial inner side R1, the slide pin 45 is prevented from coming out of the inner space of the upper guide portion 40C.

The slide pin 45 arranged in the internal space of the lower guide portion 41C is arranged across the inner space 41G and the outer space 41H of the lower guide portion 41C. In this slide pin 45, the inner flange portion 45A is arranged in the inner space 41G, and the outer flange portion 45B is arranged in the outer space 41H. This slide pin 45 is slidable in the radial direction R. As shown in FIG. When the slide pin 45 slides radially outward R2, the radially outer R2 end portion of the slide pin 45 can protrude radially outward R2 from the through hole 41L of the end wall 41J of the lower guide portion 41C. Since the outer flange portion 45B of the slide pin 45 faces the end wall 41J from the radial inner side R1, the slide pin 45 is prevented from coming out of the inner space of the lower guide portion 41C.

The holder 47 has a box shape that is long in the vertical direction Z and thin in the radial direction R, and the internal space thereof is open to the radial outside R2. Therefore, the holder 47 includes a bottom wall 47A extending in the vertical direction Z, a top wall 47B extending radially outward R2 from the top end of the bottom wall 47A, a bottom wall 47C extending radially outward R2 from the bottom end of the bottom wall 47A, and a pair of side walls 47D (see FIG. 7) extending radially outward R2 from both ends of the bottom wall 47A in the circumferential direction S. The dimension in the vertical direction Z of the side wall 47D is substantially the same as the dimension in the vertical direction Z of the internal space 25C of the frame 25 of the filter 23 . A bottom wall 47A of the holder 47 is opposed to the upper guide portion 40C and the lower guide portion 41C, which are located at the same position in the circumferential direction S as the holder 47, from the radial outer side R2.

The brush 48 is composed of bristles that are planted on the radially outer R2 end faces of each of the pair of side walls 47D of the holder 47 and protrude radially outward R2 (see also FIG. 7). Specifically, bundles 48A of a predetermined number of hairs are provided at equal intervals in the vertical direction Z over substantially the entire end surface of the radially outer side R2 of each side wall 47D. Instead of the bundle 48A of bristles, the brush 48 may be configured by, for example, elastically deformable protrusions. Alternatively, instead of the brush 48, a wiper elongated in the vertical direction Z and protruding radially outward R2 from the side wall 47D may be employed.

The weight 34 is a metal plate that is elongated in the vertical direction Z and is tightly accommodated in the inner space of the holder 47 . The weight 34 and the holder 47 are fixed to the two upper and lower slide pins 45 by assembling the bolts 46 mentioned above through the bottom wall 47A of the weight 34 and the holder 47 one by one into the screw holes 45C of the respective slide pins 45. Thus, each scraping member 33 is completed. Each scraping member 33 is supported by the upper guide portion 40C and the lower guide portion 41C of the rotating body 32 via the slide pin 45 in the filter 23, and is slidable in the radial direction R as the slide pin 45 slides. be. A head portion 46A of the bolt 46 is buried inside the weight 34 so as not to protrude from the end surface of the radially outer side R2 of the weight 34 .

The cleaning unit 24 further includes one urging member 49 arranged in each of the internal spaces of the upper guide portion 40C and the lower guide portion 41C. The biasing member 49 is a coil spring extending in the radial direction R. In the upper guide portion 40C, the biasing member 49 is arranged in the outer space 40H and surrounds the slide pin 45, and is compressed between the end wall 40J and the outer flange portion 45B of the slide pin 45, thereby causing the slide pin 45 to move. is always urged radially inward R1. In the lower guide portion 41C, the biasing member 49 is arranged in the outer space 41H and surrounds the slide pin 45, and is compressed between the end wall 41J and the outer flange portion 45B of the slide pin 45, so that the slide pin 45 is always urged radially inward R1.

8 to 11, all the slide pins 45 are fully retracted radially inward R1. In this state, each scraping member 33 is at a retracted position away from the inner peripheral surface portion 23A of the filter 23 toward the central axis J, that is, radially inward R1. The bottom wall 47A of the holder 47 is in contact with the end wall 40J of the upper guide portion 40C and the end wall 41J of the lower guide portion 41C. Each scraping member 33 is always biased toward the retracted position by a biasing member 49 .

In the above-described drainage process, the controller 19 first operates the pump P with the drainage valve 13 closed (see FIG. 1). Then, the pump P causes the water that has flowed down from the washing tub 5 into the upstream channel 12A of the drainage channel 12 to flow to the second downstream channel 12C. Water flowing through the second downstream flow path 12C rises in the upstream region 12CA of the second downstream flow path 12C as indicated by the dashed-dotted arrow in FIG. flow into 21;

The water that has flowed into the case 21 from the inflow port 21I flows directly to the intake port 25F of the filter 23 without substantially leaking, as indicated by the dashed-dotted arrow in FIG. It is taken into the filter 23 and is poured onto the blades 40E in the filter 23 from the tangential direction T described above. Then, the entire rotating body 32 having the blades 40E that have received the water taken into the filter 23 from the intake port 25F is moved in one direction in the circumferential direction S by the momentum of the water. Rotate in a clockwise direction.

Further, the water taken into the filter 23 through the intake port 25F flows out of the filter 23 through the filter hole 26A of the inner peripheral surface portion 23A of the filter 23, that is, into the gap 21M between the filter 23 and the case 21 inside the case 21. . When the water passes through the filter holes 26A, foreign matter contained in the water is captured and adheres to the inner peripheral surface portion 23A. That is, the filter 23 captures foreign matter contained in the water flowing out of the filter 23 from the filter holes 26A at the inner peripheral surface portion 23A. The water flowing out of the filter 23 not only passes through the mesh sheet 26 of the inner peripheral surface portion 23A to the radial outside R2, but also passes through the mesh sheet 26 of the bottom wall 25A of the frame 25 to the lower side Z2. good.

The water flowing out of the filter 23 flows out of the case 21 from the outflow port 21G of the bottom wall 21A of the case 21, flows down the downstream region 12CB of the second downstream channel 12C, and joins the first downstream channel 12B to wash the water. It is discharged outside the machine 1 (see the two-dot chain line arrow in FIG. 1). If the amount of water flowing into the filter 23 exceeds the amount of water flowing out of the filter 23, the water in the filter 23 will flow through the overflow hole 25H (see FIG. 8) provided at the upper end of the frame 25. ) to the outside of the filter 23 and out of the case 21 through the outflow port 21G.

Each scraping member 33, which has been in the retracted position until now, slides radially outward R2 against the biasing force of the biasing member 49 due to the centrifugal force generated by the rotation of the rotating body 32, and as shown in FIG. , is arranged at an advanced position close to the inner peripheral surface portion 23A of the filter 23. As shown in FIG. In each scraping member 33 at the advanced position, the brush 48 rotates as a part of the rotating body 32 and comes into contact with the foreign matter on the inner peripheral surface 23A of the filter 23, thereby removing the foreign matter from the inner peripheral surface 23A of the filter 23. scrape off When the brush 48 comes into contact with foreign matter on the inner peripheral surface 23A, the rotational speed of the rotating body 32 temporarily decreases and the centrifugal force decreases. retreat to the side. Thus, each scraping member 33 is slidable in the radial direction R between the retracted position and the advanced position.

Then, when the rotation speed of the rotating body 32 recovers and the centrifugal force increases, each scraping member 33 advances to the advanced position again and contacts the foreign matter on the inner peripheral surface portion 23A of the filter 23 . In this manner, the scraping member 33 repeatedly advances and retreats between the advanced position and the retracted position during the rotation of the rotating body 32 accompanying the drainage, and repeatedly contacts the foreign matter on the inner peripheral surface portion 23A of the filter 23. As a result, foreign matter can be efficiently scraped off from the inner peripheral surface portion 23A of the filter 23 . As a result, clogging of the filter 23 in the filter hole 26A can be suppressed, and maintenance can be improved. In other words, even minute foreign matter such as microplastics and microfibers can be captured continuously for a long time while peeling off the foreign matter adhering to the inner peripheral surface portion 23A. can. In particular, when the scraping member 33 is always at the advanced position, there is a risk that the scraping member 33 may be caught on the inner peripheral surface portion 23A and the rotation of the rotor 32 may stop unexpectedly. Smooth rotation of the rotating body 32 can be continued by configuring the rotatable body 33 so as to be able to move forward and backward.

The vane 40E, which rotates the rotating body 32 by receiving water taken into the filter 23 from the intake port 25F, is arranged above the lower half where water tends to accumulate in the internal space 25C of the filter 23 (FIG. 11). reference). Furthermore, the inlet 25F faces the blade 40E from the circumferential direction S or the tangential direction T (see FIG. 10). As a result, the blades 40E are less susceptible to the resistance of water accumulated in the lower half of the internal space 25C of the filter 23, and efficiently receive the water taken into the filter 23 from the inlet 25F. It can rotate vigorously. Therefore, since a large centrifugal force is generated, the scraping member 33 can easily advance to the advanced position, so that the scraping member 33 can scrape the foreign matter from the inner peripheral surface portion 23A of the filter 23 more efficiently. As a result, clogging of the filter 23 in the filter hole 26A can be further suppressed, and maintainability can be further improved.

In addition, since the weight 34 connected to the scraping member 33 generates a large centrifugal force, the scraping member 33 is likely to advance to the advanced position. Foreign matter can be efficiently scraped off. As a result, clogging of the filter 23 in the filter hole 26A can be further suppressed, and maintainability can be further improved.

Even if the filter 23 is clogged, the water in the filter 23 overflows from the overflow hole 25H to the outside of the filter 23 and flows out of the case 21 from the outflow port 21G. can be smoothly discharged out of the machine. Further, inside the case 21, a concave portion 21L is provided so as to be recessed away from the overflow hole 25H, and the outflow port 21G is arranged directly below the overflow hole 25H (see FIG. 9). The overflowing water can be quickly transferred from the recess 21L to the outflow port 21G and discharged to the outside of the machine.

Thus, when the pump P operates with the drain valve 13 closing the first downstream channel 12B, the water in the upstream channel 12A flows through the second downstream channel 12C, and the filter device 20 traps the foreign matter. Afterwards, it is ejected from the aircraft. When the amount of water in the washing tub 5 decreases and the pump P tends to suck air, the controller 19 stops the pump P and the drain valve 13 opens the first downstream channel 12B. Then, water stops flowing into the filter device 20, so that each scraping member 33 returns to the retracted position. That is, the retracted position is the standby position of each scraping member 33 .

When the first downstream channel 12B is opened, the remaining water in the washing tub 5 flows from the upstream channel 12A through the first downstream channel 12B and is discharged to the outside of the machine, so the pump P operates in a state where air is trapped. The noise caused by this can be suppressed, and all the water in the washing tub 5 can be discharged. The control unit 19 detects the water level in the washing tub 5 based on the detected value of a water level sensor (not shown) that detects the water level in the washing tub 5 and the elapsed time measured by a timer (not shown). determine that it has decreased.

In the filter device 20, the foreign matter peeled off from the inner peripheral surface portion 23A of the filter 23 accumulates in the inner space 25C of the frame 25 of the filter 23 from the bottom wall 25A side. In filter device 20, at least lid 30 of filter unit 22 is exposed from upper surface 2A of housing 2 of washing machine 1 (see FIG. 1). Therefore, as maintenance, the user removes the first engaging portion 21J and the second engaging portion 21K of the case 21 from the third engaging portion 30A and the fourth engaging portion 30C of the lid 30, respectively, and removes the filter unit 22. It can be removed from the washing machine 1 and disassembled as described above to remove foreign matter in the filter 23 . As described above, the filter device 20 can continue to trap foreign matter for a long time, so the user does not have to maintain the filter 23 every day. The user can assemble the filter unit 22 and return it to the washing machine 1 by reversing the procedure.

The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims.

For example, the first downstream channel 12B may be omitted in the drainage channel 12, and the drainage valve 13 may also be omitted. In that case, the downstream channel of the drainage channel 12 is only the second downstream channel 12C, and the downstream region 12CB of the second downstream channel 12C is pulled out of the washing machine 1 . Alternatively, the first downstream channel 12B and the second downstream channel 12C may be separately drawn out of the washing machine 1 without merging.

1 washing machine 5 washing tub 12 drainage channel 12A upstream channel 12B first downstream channel 12C second downstream channel 12CB downstream region 13 drain valve 20 filter device 21 case 21G outlet 21I inlet 21L recess 23 filter 23A inner peripheral surface 25C internal space 25F intake port 25H overflow hole 26A filter hole 32 rotating body 33 scraping member 34 weight 40E blade 49 biasing member K central axis P pump Q laundry R radial direction S circumferential direction T tangential direction Z1 upper side

Claims (5)

a case provided with an inlet and an outlet, wherein water in a drainage channel of a washing machine flows into the case from the inlet and water in the case flows out from the outlet;
A filter provided with a cylindrical inner peripheral surface portion having a vertically extending central axis and a plurality of filter holes distributed in the inner peripheral surface portion, the filter being arranged in the case, wherein the flow from the inlet into the case The filter has an inlet for taking in the water flowing into the filter, and after being taken into the filter through the inlet, foreign matter contained in the water flowing out of the filter through the filter hole is removed from the inner peripheral surface portion. a filter that captures at
a rotary body arranged in the filter and rotated around the central axis by the momentum of water taken into the filter from the inlet;
A scraping member that is supported by the rotating body in the filter and scrapes foreign matter from the inner peripheral surface, the scraping member having an advanced position approaching the inner peripheral surface and a retracted position away from the inner peripheral surface toward the central axis. a scraping member radially slidable relative to the central axis between positions;
a biasing member biasing the scraping member toward the retracted position. The rotating body includes a vane that receives water taken into the filter from the intake port and is arranged above the lower half of the internal space of the filter,
2. The filter device according to claim 1, wherein the inlet faces the blades in a circumferential direction around the central axis or in a tangential direction to the circumferential direction. 3. A filter device according to claim 1 or 2, comprising a weight connected to the scraping member. An overflow hole is provided in a region above the filter hole in the filter for causing water in the filter to overflow outside the filter,
A concave portion is provided in the case so as to be recessed away from the overflow hole,
A filter device according to any one of claims 1 to 3, wherein the outlet is located directly below the overflow hole. a washing tub for storing laundry;
a drainage channel having an upstream channel connected to the washing tub, and a first downstream channel and a second downstream channel branched from the upstream channel;
a drain valve that opens and closes the first downstream channel;
a pump provided in the second downstream flow path for causing water in the upstream flow path to flow into the second downstream flow path;
and the filter device according to any one of claims 1 to 4, provided in a downstream region of the second downstream flow path further away from the upstream flow path than the pump.

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