Washing machine and rotating impeller disc for washing machine

Abstract

The purpose of the present invention is to provide a washing machine and a rotating impeller disc for a washing machine, which are low in cost and reduce damage to clothes. Therefore, the rotating impeller disc of the present invention comprises: an impeller base having a plurality of protrusions and troughs formed on the upper surface thereof; a bearing that supports a shaft that rotates by the power of the drive unit; the bearing is arranged on the lower surface of the impeller base body, the first blades are arranged on the outer side of the bearing in the radial direction, the impeller base body, the bearing and the first blades are integrated, and a plurality of first through holes penetrating through the impeller base body vertically are formed between the first blades adjacent to each other in the circumferential direction. The first blade protrudes obliquely with respect to the vertical direction.

Description

Technical Field

[0001] The present invention relates to a washing machine and a rotating impeller disc for a washing machine. Background Art

[0002] A washing machine with a washing tub placed vertically is provided with a rotating impeller disk at the bottom of the washing tub, and the rotating impeller disk is rotated forward and reversely to wash. Patent document 1 discloses a washing machine, in which a screw is provided at the central part of a stirring impeller (rotating impeller) for stirring a fluid by rotation, and the screw rotates integrally with the stirring impeller body to generate a water flow.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-136460 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In the washing machine disclosed in Patent Document 1, the screw that generates the water flow is constructed separately from the stirring impeller body (base), so the number of parts increases and the assembly man-hours also increase. In addition, when the screw is fixed to the stirring impeller body by screws, a horizontal space is required to form a threaded hole, and the gap between the blades constituting the screw becomes smaller. That is, the total area of ​​the through holes that are provided between the blades and penetrate the stirring impeller body from top to bottom also becomes smaller, so the water flow generated by the screw becomes weaker, and the time required for washing may become longer. As a result, in the technology described in Patent Document 1, the time that clothes rub against each other also becomes longer, and there is a possibility that the cloth is easily damaged.

[0008] An object of the present invention is to provide a washing machine and a rotary impeller disk used in the washing machine which can reduce the cost and reduce the damage to the clothes.

[0009] Means for solving problems

[0010] The rotating impeller disk of the present invention includes: an impeller base having a plurality of protrusions and valleys formed on the upper surface; a bearing supporting a shaft that rotates using the power of the driving unit; and a plurality of first blades arranged on the lower surface of the impeller base on the radially outer side of the bearing, wherein the impeller base, the bearing and the first blades are integrated, and a plurality of first through holes that pass through the impeller base up and down are formed between the first blades adjacent to each other in the circumferential direction, and the first blades protrude obliquely relative to the vertical direction.

[0011] Effects of the Invention

[0012] According to the present invention, it is possible to provide a washing machine and a rotary impeller disk used in the washing machine which can reduce the cost and reduce the damage to the clothes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a right side longitudinal sectional view which shows the washing machine equipped with the rotary impeller disk of this embodiment.

[0014] Figure 2 It is a perspective view showing the shape of the upper surface side of the rotary impeller disk.

[0015] Figure 3 This is the top view of the rotating impeller disk.

[0016] Figure 4 is Figure 3 Cross-sectional view of the rotating impeller disk cut through AA.

[0017] Figure 5 It is a front view of the rotating impeller disk.

[0018] Figure 6 It is a perspective view showing the shape of the lower surface side of the rotary impeller disk.

[0019] Figure 7 is Figure 6 A cross-sectional perspective view of the rotating impeller disk cut off by BB.

[0020] Figure 8 This is the bottom view of the rotating impeller disk.

[0021] Fig. 9 Is Figure 8 Magnified view of the area enclosed by the dashed line. DETAILED DESCRIPTION

[0022] Hereinafter, a mode for implementing the present invention (hereinafter referred to as "embodiment") will be described in detail with reference to the drawings as appropriate. In addition, the following description will be given by taking a washing machine S (so-called vertical washing and drying machine) capable of washing, rinsing, dehydrating and drying as an example.

[0023] Figure 1 2 is a right side longitudinal sectional view showing a washing machine equipped with a rotary impeller disk according to the present embodiment. Figure 1 As shown, the washing machine S includes an outer frame 1 of a housing, an outer tub 2 for storing washing water, a washing and dehydrating tub 3 (washing tub), a rotary impeller 4 (agitator), and a driving motor (driving unit) 10 .

[0024] The outer frame 1 is formed into a square tube shape by pressing a metal plate (iron plate) or the like. In addition, a base 32 made of synthetic resin is provided at the lower part of the outer frame 1. In addition, a top cover (upper plate) 6 made of synthetic resin is provided at the upper part of the outer frame 1. In addition, although not shown, a reinforcing member is used inside the outer frame 1 to reinforce the outer frame 1. In addition, the base 32 is reinforced by providing a lattice-shaped rib or the like inside.

[0025] The outer barrel 2 is made of synthetic resin and has a bottomed cylindrical shape. It is supported in the center of the outer frame 1 via a vibration-proof device (not shown). The vibration-proof device includes a spring and elastic rubber, and supports the outer barrel 2 from the upper part of the outer frame 1 in a suspended manner.

[0026] The washing and dehydrating barrel (washing barrel) 3 has a bottomed cylindrical shape for storing the laundry (clothing) to be washed, dehydrated, and dried. In addition, the rotation axis of the washing and dehydrating barrel 3 is oriented in a substantially vertical direction. In addition, the washing and dehydrating barrel 3 is disposed in the center of the outer barrel 2 and is rotatably supported in the outer barrel 2. In addition, the washing and dehydrating barrel 3 has a plurality of small through holes 3a (in the outer wall) for water flow and ventilation. Figure 1 In addition, the washing and dehydrating barrel 3 has a plurality of through holes 3b for water flow and ventilation on its bottom wall. In addition, a fluid balancer 3c is provided at the upper edge of the washing and dehydrating barrel 3. In addition, a rotating impeller disk 4 for stirring the washing water for washing, rinsing, etc. is rotatably provided at the bottom of the washing and dehydrating barrel 3.

[0027] The rotary impeller disk 4 is rotatably arranged at the bottom center of the washing and dehydrating barrel 3, and repeatedly rotates forward / reverse during washing operation and drying operation. In addition, the details of the rotary impeller disk 4 will be described later.

[0028] The driving motor 10 is arranged in the outer frame 1, and selectively drives the rotating impeller disk 4 and the washing and dehydrating bucket 3 to rotate. In addition, the driving motor 10 uses, for example, a DC brushless motor. The DC brushless motor is controlled by vector control. In addition, the driving motor 10 can directly drive the rotating impeller disk 4 and the washing and dehydrating bucket 3, and can also be driven by a speed reduction mechanism such as a belt.

[0029] An openable and closable outer cover 5 is provided on the upper part of the outer frame 1. The rear side of the outer cover 5 is axially supported by a top cover 6 provided on the upper part of the outer frame 1. An inner cover 34 is provided on the upper part of the outer tub 2, below the outer cover 5, so as to be openable and closable around a rear axis. The laundry is taken out and put into the washing and dehydrating tub 3 by opening the outer cover 5 and the inner cover 34.

[0030] A water supply unit 7 is provided on the rear side of the outer cover 5 of the top cover 6 in the outer frame 1 .

[0031] The water supply unit 7 includes a water supply tank (not shown) having a plurality of water channels therein.

[0032] The water supply unit 7 supplies water from a water supply hose connection port 8 protruding upward from the top cover 6. Tap water or bath water is supplied from the water supply hose connection port 8 and poured into the tub 2.

[0033] In addition, a device 35 for dispensing detergent and softener is provided on the front side of the top cover 6 .

[0034] Detergent and softener are injected into the space between the outer tub 2 and the washing and dehydrating tub 3 through the input hose 36 .

[0035] In addition, the washing machine S is provided with a drying mechanism 9 for drying the laundry. The drying mechanism 9 circulates and supplies air for drying the laundry in the washing and dehydrating tub 3 and performs dehumidification. Most of the drying mechanism 9 is occupied by a drying air circulation passage. The drying air circulation passage includes a bottom circulation passage 20 connected to the bottom of the outer tub 2 and a dehumidification longitudinal passage 21 extending upward from the bottom circulation passage 20.

[0036] In addition, the drying mechanism 9 has an air blower 22 and a heater (not shown) for generating dry air during the drying operation of the washing machine S. The suction side of the lower portion of the air blower 22 is connected to the upper end portion of the dehumidification longitudinal passage 21. A drying filter 54 is arranged between the air blower 22 and the dehumidification longitudinal passage 21 to prevent foreign matter from flowing into the air blower 22. The discharge side of the front portion of the air blower 22 is connected and communicated with the return connection circulation passage 25. The return connection circulation passage 25 is communicated with the upper portion of the outer barrel 2 via a portion of the upper corrugated hose 23. An exhaust port 23a is formed in the return connection circulation passage 25 for discharging dry air into the washing and dehydration barrel 3. From the exhaust port 23a, as shown in FIG. Figure 1 As shown by the middle arrow, the dry air is discharged vertically downward from the upper corrugated hose 23 into the washing and dehydrating tub 3 and blown to the outer peripheral area of ​​the rotary impeller disc 4.

[0037] The bottom circulation passage 20 is connected to the bottom of the outer tub 2 via a portion of the lower bellows hose 26. The lower bellows hose 26 is connected to the bottom drop-in portion 31 of the outer tub 2. The bottom drop-in portion 31 is connected to the washing water drain 52 for drainage via a normally closed drain valve 53 that is opened only when draining water.

[0038] The drain valve 53 is closed during the washing operation and the drying operation, and is opened when the washing water is discharged, so that the washing water and the rinsing water accumulated in the outer tub 2 are discharged to the outside of the washing machine S (outside the machine) through the washing water drain passage 52 .

[0039] The washing machine S is provided with a water level sensor 55 for detecting the water level of the washing water and the rinsing water accumulated in the outer tub 2. An air trap 50 is provided near the bottom of the outer tub 2. An air pipe 56 is connected to the air trap 50 in communication, and the water level sensor 55 is connected to the upper end of the air pipe 56 in communication.

[0040] The washing water and rinsing water accumulated in the outer tub 2 flow from the circulating water paths 51a and 61a into the circulating water paths 51b and 61b, and flow upward in the circulating water paths 51b and 61b. The washing water rising in the circulating water path 51b passes through the lint filter 33 to remove lint, and enters the washing and dehydrating tub 3. On the other hand, the washing water rising in the circulating water path 61b is sprayed near the center of the washing and dehydrating tub 3 from the slit-shaped discharge port 61c in a shower-like manner.

[0041] Next, the operations of the washing machine S in the present embodiment during the washing operation and the drying operation will be described.

[0042] In the washing process, first, the water supply unit 7 supplies water to the input device 35, thereby supplying detergent and tap water, etc. into the outer barrel 2. In addition, the solid detergent is dissolved by the tap water, etc., and the liquid detergent is diluted by the tap water, etc., to generate a high-concentration detergent liquid. At this time, as needed, the motor 10 can be driven to rotate the rotary impeller disk 4 to generate a water flow based on the first blade 43 and the second blade 44 described later, thereby generating a high-concentration detergent liquid. The water supply unit 7 stops supplying water when the first water level reaches the level of the first blade 43 and the second blade 44 that immerse the lower surface (back side) of the rotary impeller disk 4. In addition, the first water level is preferably a low water level that does not exceed the upper surface of the rotary impeller disk 4, but it can also be a water level that slightly exceeds the upper surface of the rotary impeller disk 4.

[0043] When the motor 10 is driven at the first water level to rotate the rotary impeller disk 4, the high-concentration detergent liquid accumulated at the bottom of the outer barrel 2 flows upward in the circulating water paths 51b and 61b and is supplied to the washing and dehydration barrel 3. In this way, the high-concentration detergent liquid is circulated in a manner that the high-concentration detergent liquid falls on the laundry, while the rotary impeller disk 4 is rotated alternately in the forward and reverse directions, and the raised portion 40a repeatedly applies an upward force to the laundry to press and wash the laundry (pre-washing). Afterwards, the water supply unit 7 supplies water to a second water level higher than the first water level, and the motor 10 is driven to rotate the washing and dehydration barrel 3 and the rotary impeller disk 4 alternately in the forward and reverse directions to perform washing at a high water level (formal washing).

[0044] In the rinsing process, similarly to the washing process, the rinsing water supplied in the form of accumulation at the bottom of the outer barrel 2 is circulated so as to fall onto the laundry, while the rotary impeller disk 4 is rotated in forward and reverse directions to perform rinsing to remove the detergent components contained in the laundry. In the dehydration process, the washing and dehydration barrel 3 and the rotary impeller disk 4 are rotated in one direction (reverse direction) at high speed by driving the motor 10, and the water contained in the laundry is dehydrated by centrifugal force. When the dehydration process is completed, the washing operation is transferred to the drying operation. In the drying operation, the rotary impeller disk 4 is rotated in forward and reverse directions, while the air in the outer barrel 2 is sucked out and water-cooled and dehumidified, and then heated and blown into the washing and dehydration barrel 3 to circulate, thereby drying the laundry.

[0045] Here, use Figure 2 and Figure 3 , the shape of the upper surface side of the rotary impeller disk 4 will be described in detail. Figure 2 This is a perspective view showing the shape of the upper surface of the rotary impeller disk. Figure 3 The shape of the upper surface of the rotary impeller disk 4 affects the movement of the laundry during the above-mentioned washing operation and drying operation.

[0046] like Figure 2 and Figure 3 As shown, four raised portions 40a extending from the central periphery of the rotary impeller disk 4 to the outer diameter side and four valley portions 40b located between the raised portions 40a adjacent to each other in the circumferential direction are formed on the upper surface of the impeller base 40 of the rotary impeller disk 4. In the present embodiment, an example of the rotary impeller disk 4 having four raised portions 40a and four valley portions 40b is shown, but the number of the raised portions 40a and the valley portions 40b is not limited to four.

[0047] The raised portion 40a has a relatively high ridgeline 40a1 in the circumferential direction and convex inclined surfaces 40a2 that continuously descend on both sides of the circumferential direction. Therefore, when the rotary impeller disk 4 rotates, the convex inclined surfaces 40a2 repeatedly exert upward force on the laundry placed on the rotary impeller disk 4.

[0048] The valley portion 40b has a relatively lower concave inclined surface (valley-shaped concave curved surface) than the raised portion 40a, and is in a so-called bowl shape with a lower radial central portion and higher inner and outer diameter portions. In addition, the valley portion 40b also has a large number of second through holes 40b1 that penetrate the impeller base 40 from top to bottom for water and ventilation. Here, the second through holes 40b1 are not formed in the raised portion 40a, thereby preventing the laundry from being hooked and reducing damage to the laundry.

[0049] When the rotary impeller disk 4 rotates during the washing process, the laundry is pushed up by the convex inclined surface 40a2 of the raised portion 40a. At this time, the cleaning force is improved due to the beating cleaning effect of the pushed-up laundry when it falls and the friction cleaning effect generated by the friction between the rotary impeller disk 4 and the laundry. In addition, when the rotary impeller disk 4 rotates during the drying operation, the laundry is pushed up by the convex inclined surface 40a2 of the raised portion 40a, which promotes the replacement of the upper and lower laundry. By replacing the laundry, the uneven drying of the laundry is reduced.

[0050] In addition, in this embodiment, the raised portion 40a and the valley portion 40b are symmetrically arranged about the rotation center point. Therefore, whether the rotary impeller disk 4 is rotated forward or reversely, the movement of the laundry does not change, so it is not easy to cause cloth entanglement or bias of cloth pieces, which can prevent uneven washing and cloth damage.

[0051] Figure 4 is Figure 3 AA cut-off of the rotating impeller disc, Figure 5 This is a front view of the rotating impeller disk. Figure 4 As shown, the rotary impeller disk 4 has a bulging portion 41 bulging upward around the center of rotation thereof, and a bearing 42 for supporting a shaft that rotates by the power of the drive motor 10 is formed inside the bulging portion 41. In addition, on the lower surface of the impeller base 40, a first blade 43, a second blade 44, and a third blade 45 are formed as back blades (rib-shaped) constituting the protrusion portion.

[0052] Each blade protrudes downward, and its lower end is located on a substantially same plane. These back blades play a role in reinforcing the strength of the rotary impeller disk 4, and in particular, the first blade 43 and the second blade 44 also play a role in causing the detergent liquid and the rinse water accumulated at the bottom of the outer tub 2 to generate a water flow during the washing process and the rinsing process.

[0053] Below, use Figure 6 to Figure 9 , the shape of the lower surface side of the rotary impeller disk 4 will be described in detail. Figure 6 This is a perspective view showing the shape of the lower side of the rotary impeller disk. Figure 7 is Figure 6 The BB cut-off cross-sectional perspective view of the rotating impeller disk. In addition, Figure 8 This is the bottom picture of the rotating impeller disk. Fig. 9 yes Figure 8 Magnified view of the area enclosed by the dotted line.

[0054] The first blade 43 is a back blade extending in the radial direction, and a plurality of the first blades 43 are provided at a position radially outward from the outer diameter end of the bearing 42, thereby improving the strength of the impeller base 40. Moreover, in the washing process, the first blades 43 push the detergent liquid and the like accumulated at the bottom of the outer barrel 2 mainly to the outer diameter side along with the rotation of the rotary impeller disc 4, and use the momentum (dynamic force) to supply the detergent liquid and the like to the washing and dehydration barrel 3 through the circulating water paths 51b and 61b. In addition, in the present embodiment, an example of a rotary impeller disc 4 having six first blades 43 formed in the circumferential direction is shown, but the number of the first blades 43 is not limited to six.

[0055] In addition, a plurality of first through holes 40c penetrating the impeller base 40 in the vertical direction are formed between the first blades 43 adjacent in the circumferential direction. The detergent liquid or the like can easily flow into between the first blades 43 adjacent in the circumferential direction through the first through holes 40c, and the momentum of pushing the detergent liquid or the like toward the outer diameter side is also strengthened, thereby contributing to an increase in the circulation flow rate of the detergent liquid or the like.

[0056] The second blade 44 is a back blade extending in the radial direction, and is disposed at a different (displaced in the radial direction) position from the first blade 43, specifically, at a position radially outward from the outer diameter end of the first blade 43, so as to improve the strength of the impeller base 40. The second blade 44 also pushes the detergent liquid and the like accumulated at the bottom of the outer barrel 2 mainly to the outer diameter side along with the rotation of the rotary impeller disk 4 during the washing process, and supplies the detergent liquid and the like to the washing and dehydration barrel 3 via the circulating water paths 51b and 61b by using its momentum. In particular, since the valley 40b formed on the upper surface of the impeller base 40 is a so-called bowl shape as described above, the downward protrusion amount of the second blade 44 is larger at the outer diameter end than at the inner diameter side. Therefore, the detergent liquid and the like pushed to the outer diameter side by the first blade 43 is more easily scraped to the outer diameter side and easily guided to the circulating water paths 51b and 61b.

[0057] The third blade 45 is a back blade extending in the circumferential direction, and a plurality of the third blades 45 are provided in a concentric circle to improve the strength of the impeller base 40. The third blade 45 is composed of a blade 45a provided on the inner diameter side of the boundary between the first blade 43 and the bearing 42, a blade 45b provided on the outer diameter side of the boundary between the first blade 43 and the second blade 44, and a blade further provided on the outer diameter side thereof.

[0058] Here, as described above, both the first blade 43 and the second blade 44 play a role in circulating the detergent solution or the like accumulated at the bottom of the outer tub 2, but the difference is that the second blade 44 protrudes downward in the vertical direction, while the first blade 43 protrudes downward at an angle relative to the vertical direction. In addition, a step that becomes lower toward the outer diameter side is formed on the upper end surface of the first blade 43.

[0059] In this embodiment, the impeller disk 4 rotates clockwise (in the reverse direction, Fig. 9 When the first blade 43 rotates in the direction of the arrow of the arrow, the momentum of the first blade 43 pushing the detergent liquid to the outer diameter side becomes stronger, and through the synergistic effect with the pushing momentum of the second blade 44, the flow of the detergent liquid from the vicinity of the center to the outer diameter side becomes particularly large. As a result, the flow of the detergent liquid circulating in the washing and dehydrating barrel 3 through the circulating water paths 51b and 61b increases, and the cleaning power is improved. In addition, when the rotating impeller disk 4 rotates counterclockwise (in the direction of forward rotation) when viewed from below, the force from the lower surface to the upper surface of the impeller base 40 acts on the detergent liquid, etc., and the flow of the detergent liquid accumulated at the bottom of the outer barrel 2 is activated as a whole by the flow through the first through hole 40c and the flow through the second through hole 40b1, and the cleaning power is improved. Therefore, even if the rotation speed of the rotating impeller disk 4 is not changed in the washing process and the rinsing process to shorten the time spent, a certain cleaning power can be maintained. That is, the time during which the rotary impeller disk 4 rotates can be shortened in the washing process, and thus the time during which the laundry rubs against each other can be shortened, thereby reducing damage to the cloth and reducing the amount of lint generated.

[0060] Furthermore, in the present embodiment, not only the second blade 44 and the third blade 45 but also the first blade 43 are formed integrally with the impeller base 40 , so the number of components and the number of assembly steps do not increase.

[0061] There is no need to fix the first blades 43 to the threaded holes of the impeller base 40 , so the gaps between adjacent first blades 43 can be increased, the number and size of the first through holes 40 c can be increased, and the generated water flow can be enhanced.

[0062] Here, the first blades 43 radially connect the inner diameter blades 45a and the outer diameter blades 45b of the third blades 45. Therefore, even when the total area of ​​the first through holes 40c is increased as described above, the strength of the impeller base 40 can be maintained.

[0063] Furthermore, the first blades 43 of this embodiment are formed in the bulged portion 41 radially inward of the region where the valley portion 40b is present, so that the downward protrusion amount can be increased. As a result, the strength of the impeller base 40 is further improved, and the generated water flow becomes stronger.

[0064] In addition, the present invention is not limited to the above-mentioned embodiment, and includes various modified examples. For example, in the above-mentioned embodiment, a washing and drying machine having a drying mechanism is described, but it can also be applied to a fully automatic washing machine without a drying mechanism.

[0065] Description of Reference Numerals

[0066] S...washing machine, 1...outer frame, 2...outer tub, 3...washing and dehydrating tub (washing tub), 4...rotating impeller disc, 10...driving motor (driving unit), 23a...discharge outlet, 40...impeller base, 40a...raised portion, 40a1...ridgeline, 40a2...convex inclined surface, 40b...valley, 40b1...second through hole, 40c...first through hole, 41...bulging portion, 42...bearing, 43...first blade, 43a...step, 44...second blade, 45...third blade, 45a...blade (third blade on the inner diameter side), 45b...blade (third blade on the outer diameter side).

Claims

1. A washing machine, characterized in that: include: Washing tub; A rotating impeller disc disposed at the bottom of the washing tub; An outer barrel containing the washing barrel and storing washing water; and a driving unit for driving the washing tub and the rotating impeller disc to rotate, The rotating impeller disk comprises: An impeller base having a plurality of ridges and valleys formed on the upper surface; a bearing for supporting a shaft that rotates using the power of the driving unit; and A plurality of first blades are arranged on the lower surface of the impeller base and radially outward of the bearing. The impeller base, the bearing and the first blade are integrated. A plurality of first through holes penetrating the impeller base body in an up-and-down direction are formed between the first blades adjacent to each other in the circumferential direction. The first blade protrudes obliquely with respect to the vertical direction.

2. The washing machine according to claim 1, characterized in that: The rotating impeller disk further includes a plurality of second blades arranged radially outward of the first blades on the lower surface of the impeller base. The second blade protrudes in the vertical direction.

3. The washing machine according to claim 2, characterized in that: The second blade extends in the radial direction, and the amount of downward protrusion at the outer diameter end is greater than the amount of downward protrusion at the inner diameter side.

4. The washing machine according to claim 2, characterized in that: The rotating impeller disk further includes a plurality of third blades extending in the circumferential direction on the lower surface of the impeller base. The first blade connects a third blade provided on an inner diameter side of a boundary between the first blade and the bearing and a third blade provided on an outer diameter side of a boundary between the first blade and the second blade.

5. The washing machine according to claim 1, characterized in that: A step that becomes lower toward the outer diameter side is formed on the upper end surface of the first blade.

6. The washing machine according to claim 1, characterized in that: The valley portion has a plurality of second through holes that penetrate the impeller base body vertically. The first blade is formed radially inward of the valley portion.

7. A rotary impeller disc for a washing machine, characterized in that: include: An impeller base having a plurality of ridges and valleys formed on the upper surface; A bearing that supports a shaft that rotates using power from a driving unit of the washing machine; and A plurality of first blades are arranged on the lower surface of the impeller base and radially outward of the bearing. The impeller base, the bearing and the first blade are integrated. A plurality of first through holes penetrating the impeller base body in an up-and-down direction are formed between the first blades adjacent to each other in the circumferential direction. The first blade protrudes obliquely with respect to the vertical direction.

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