JP4844676B2 - Drum washing machine - Google Patents

Abstract

A water circulation system comprises a spray orifice (51) provided behind a front side wall (34) of a water tub (3) and a flow path (52) formed between a back surface of the front side wall (34) of the water tub (3) and a front side wall surface of a rotary drum (4), wherein the front side wall surface (4b) of the rotary drum (4) has a shape so formed that a distance of the front side wall surface (4b) from the axis of rotation varies with rotation of the rotary drum (4), and circulating water sprayed from the spray orifice (51) is discharged through the flow path (52) into the rotary drum (4). The system can spray the circulating water evenly over laundries regardless of an amount and kind of the laundries put in the water tub (3) without requiring a complicated structure.

Description

  In the present invention, a rotating drum formed in a bottomed cylindrical shape is installed in a water tank so that the direction of the rotation axis is horizontal or inclined downward from the horizontal direction from the front side to the open side to the back side as the bottom. The present invention relates to a drum type washing machine for washing laundry stored in a rotating drum by rotationally driving the rotating drum.

  A drum-type washing machine having such a circulation function that circulates water in a water tank with a circulation pump is already known (see, for example, Patent Documents 1 to 4).

  Patent Document 1 uses one pump as a circulation pump in the washing process and the rinsing process, circulates rinsing water and washing water, and actively stirs the detergent and the washing water at the early stage of the washing process, and aims to dissolve the detergent at an early stage. The technique used as a drainage pump is disclosed in the dehydration and drainage processes, and a filter case is provided in the middle of the circulation pump suction side of the circulation path to collect impurities in the suction water. This prevents impurities from entering the circulation pump.

  Patent Document 2 prevents the phenomenon that detergent is gathered in a heater installation space or a specific space by circulating water in a water tank with a circulation pump, and at the same time, the laundry is quickly heated before washing, thereby washing efficiency. The technology which can improve is disclosed.

  Patent Document 3 circulates washing water in an aquarium by providing a circulation pump unit including a circulation pump unit and a filtering unit that captures laundry waste of yarn waste on a base plate that is the bottom of an outer box of a washing machine. In order to do this, it is provided on the base plate via an elastic cushion, preventing the vibration of the pump motor from propagating to the base plate, and as a result, the noise caused by the resonance of the vibration of the pump motor and the vibration of the outer box can be prevented. Such a technique is disclosed.

  Patent Document 4 discloses a technology in which water in a water tank is added to a rotating drum and sprayed around a drying heater to remove lint attached around the heater.

Japanese Patent Application Laid-Open No. 11-276791 JP 2005-58741 A JP 2006-223572 A JP 2006-239142 A

  However, all of the water circulation techniques disclosed in Patent Documents 1 to 4 are designed to inject the circulating water from the pipe end into the rotating drum, so that the circulating water at the corner is injected only to the local area of the laundry in the rotating drum. Cannot make full use of the circulation effect. Therefore, the techniques described in Patent Documents 2 and 4 employ a special injection nozzle to inject over a wide area, but an increase in necessary pump pressure also causes an increase in cost and has a limit. In addition, the technology disclosed in Patent Documents 1, 3, and 4 causes the piping structure of the water circulation system to pass through the front end wall portion of the water tank and face the rotating drum, which further increases the cost of the piping structure. Become.

The main object of the present invention is to increase unnecessary cost by injecting the circulating water by the circulation pump evenly into the laundry regardless of the amount and type of the laundry put into the aquarium without using a complicated structure. An object of the present invention is to provide a drum-type washing machine capable of effectively increasing the cleaning power while suppressing.

  In order to achieve the above object, a drum-type washing machine according to the present invention includes a rotating drum formed in a bottomed cylindrical shape, and a rotating shaft direction of the rotating drum from a front side opening to a back side serving as a bottom. At least one of a washing step and a rinsing step by controlling the motor and the like, a water tank disposed in the interior so as to be inclined downward from the horizontal or horizontal direction, a motor that rotationally drives the rotating drum, and the motor A water circulation system that circulates the washing water in the water tank by a circulation pump through a circulation path connected to the water tank, and the water circulation system is injected from an injection port provided on the back surface of the front end wall of the water tank. The circulating water is discharged into the rotating drum through a flow path between the back surface of the front end wall of the water tank and the front end wall surface of the rotating drum, and the front end wall surface of the rotating drum is It is characterized in that the distance from the rotation axis is changed by rotating the arm.

  As a result, the circulation path is connected to the front end wall of the aquarium so that the circulation system sucks the water in the aquarium by the circulation pump and the circulation path and circulates it back into the aquarium in the washing process and the rinsing process. Simply connect to the flow path formed between each front end wall of the water tank and the rotating drum, and circulate in the rotating drum from the annular outlet formed between the inner peripheral portions of each front end wall through this flow path without special piping. Water can be discharged. In addition, since the circulating water is discharged from the annular outlet between the inner peripheral portions of the front end walls through the flow path between the front end walls of the water tank and the rotating drum, the discharge of a special shape and structure that causes the laundry in the rotating drum to be caught. Can discharge without outlet.

  Furthermore, since the front end wall surface of the rotating drum changes in distance from the rotation axis, the discharge direction of the circulating water can be changed in the vertical direction by rotating the rotating drum, and the laundry put into the water tank Irrespective of the amount and type of the water, the washing water can be effectively increased while suppressing unnecessary cost increase by spraying the circulating water evenly onto the laundry.

  According to the drum type washing machine of the present invention, the water in the water tank is sucked back into the water tank and circulated by the circulation pump and the circulation path of the circulation system, and the water is circulated to be easy to wash. Although the function can be enhanced, it is particularly easy and simple because there is no need for special piping connected to the flow path formed between the front end walls of the water tank and the rotating drum just by connecting the circulation path to the front end wall of the water tank. Circulating water can be discharged into the rotating drum with an inexpensive piping structure. Even if the circulating water discharge port is not specially shaped and structured, the rotating drum rotates to change the direction of circulating water discharge because the front end wall surface of the rotating drum changes in distance from the rotation axis. Since it can be changed in the vertical direction, it is unnecessary to increase the cost by injecting circulating water evenly into the laundry regardless of the amount and type of laundry put into the aquarium without using a complicated structure. The detergency can be effectively increased while suppressing.

Sectional drawing of the drum type washing machine which concerns on embodiment of this invention (A) Cross-sectional view of the circulation pump used in the drum type washing machine (b) Side view of the circulation pump used in the drum type washing machine (c) Bottom view of the circulation pump used in the drum type washing machine (A) Front view showing a duct connecting the discharge side path of the water circulation path of the drum type washing machine to the water tank (b) Cross section showing the duct connecting the discharge side path of the water circulation path of the drum type washing machine to the water tank Fig. (C) Longitudinal sectional view showing a duct connecting the discharge side path of the water circulation path of the drum type washing machine to the water tank (A) Front view showing the rotating drum of the drum type washing machine (b) Longitudinal sectional view showing the relationship between the rotating drum and the water receiving tank when the front end wall of the rotating drum of the drum type washing machine is located at the bottom stop point (C) The longitudinal cross-sectional view which shows the relationship between a rotating drum and a water-receiving tank when the front-end wall of the rotating drum of the drum type washing machine is located in a top stop point The other front view which shows the rotating drum of the drum type washing machine

  According to a first aspect of the present invention, there is provided a rotating drum formed in a bottomed cylindrical shape, and the rotating drum is horizontally or downwardly inclined from the horizontal direction from the front side of the opening toward the back side of the bottom. A water tank disposed inside, a motor for rotationally driving the rotary drum, control means for controlling the motor and the like to perform at least one of a washing process and a rinsing process, and washing water in the water tank. A water circulation system that is circulated by a circulation pump through a circulation path connected to the water tank, and the water circulation system is configured such that the circulating water sprayed from an injection port provided on the back surface of the front end wall of the water tank and the back surface of the front end wall of the water tank. The rotary drum is discharged into the rotary drum through a flow path between the front end wall surface of the rotary drum, and the front end wall surface of the rotary drum is separated from the rotation axis by rotating the rotary drum. The drum-type washing machine is characterized in that the water in the water tank is sucked back into the water tank and circulated by the circulation pump and the circulation path of the circulation system in the washing process and the rinsing process. However, special piping connected to the flow path formed between the front end walls of the aquarium and the rotating drum is not necessary because the circulation path is connected to the front end wall of the aquarium. Circulating water can be discharged into the rotating drum with a simple and inexpensive piping structure with little risk of water leakage. Even if the circulating water discharge port is not specially shaped and structured, the rotating drum rotates to change the direction of circulating water discharge because the front end wall surface of the rotating drum changes in distance from the rotation axis. Since it can be changed in the vertical direction, it is unnecessary to increase the cost by injecting circulating water evenly into the laundry regardless of the amount and type of laundry put into the aquarium without using a complicated structure. The detergency can be effectively increased while suppressing.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the front end wall surface of the rotating drum exhibits a shape in which the distance from the rotational axis changes to at least two near and far due to the rotation of the rotating drum. When the drum rotates and, for example, the apex direction of the front end wall surface or the major axis direction of the ellipse approaches the discharge port of the circulating water, the discharge direction is directed downward. For example, when the central direction of the polygonal side or the minor axis direction of the ellipse approaches the discharge port of the circulating water, the discharge direction is directed upward. Thereby, circulating water can be uniformly sprayed on a laundry.

  In the third aspect of the invention, particularly in the first or second aspect of the invention, the front end wall surface of the rotary drum is substantially elliptical when viewed from the front of the rotary drum, so that the rotary drum rotates and the front end wall surface has an elliptical shape. When the major axis direction of the water approaches the discharge port of the circulating water, the discharge direction turns downward, and when the minor axis direction of the ellipse approaches the discharge port of the circulating water, the discharge direction turns upward. Water can be uniformly sprayed onto the laundry. In addition, since there are two places in each of the major axis direction and the minor axis direction, when the drum rotates once, the circulating water is discharged while changing up and down twice.

  In the fourth aspect of the invention, particularly in the first or second aspect of the invention, the surface of the front end wall of the rotating drum has a substantially polygonal shape when viewed from the front of the rotating drum. When the apex direction of the polygon approaches the discharge port of the circulating water, the discharge direction is directed downward, and when the central direction of the polygon side approaches the discharge port of the circulating water, the discharge direction is directed upward. Thus, the circulating water can be evenly sprayed onto the laundry. When the drum rotates once, the circulating water is discharged while changing up and down by the number of polygon vertices. Therefore, if the number of vertices of the polygon is large, the discharge direction changes frequently when the drum rotates once.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
As shown in FIG. 1, the drum-type washing machine according to the first embodiment has a water tub 3 disposed in a washing machine body 2 so as to be swingable. A rotating drum 4 is rotatably disposed in the water tank 3. The rotating drum 4 is driven to rotate about a rotation axis 4c by a motor 5 attached to the back surface of the water tank 3 from the outside. A fluid balancer 6 is disposed in front of the rotating drum 4 to reduce vibration during the dehydration step. A rib 6a is formed in front of the fluid balancer 6 to prevent a credit card or the like from falling.

  In addition, the drum type washing machine of the present embodiment automatically controls at least the washing step, the rinsing step, the motor 5, the water supply system 7, the drainage system 8, and the drying system 9 shown in FIG. It has a function of performing a dehydration step and a drying step. However, the dehydration step and the drying step can be omitted. Therefore, the drying system 9 can be omitted.

  The water supply system 7 supplies water in a timely manner as indicated by a solid arrow A by opening and closing a solenoid valve (not shown). Moreover, the detergent in the detergent container 7a can be poured into the water tank 3 in a timely manner using water supply.

  The drainage system 8 is threaded through a drainage pipe 8a connected to the lower part of the water tank 3, as indicated by a one-dot chain line arrow B, when necessary at the end of the washing step or the end of the rinsing step by opening and closing the drain valve 19. After passing through the drainage filter 8b that collects wastes, the washing water in the water tank 3 is drained. The drainage filter 8b can be removed from the outside.

  The drying system 9 circulates the air in the water tank 3 and the rotating drum 4 by the blower 12 as indicated by the broken line arrow C in FIG. The drying system 9 includes a filter (not shown) for collecting and removing dust from the yarns, a dehumidifying part (not shown) for dehumidifying the introduced air after dust removal, A heating unit (not shown) or the like. The blower 12 blows high-temperature air into the rotary drum 4 through the blow filter 10.

  In addition to the above, the drum-type washing machine of the present embodiment has a function of rinsing easily by circulating the washing water in the water tank 3 in the water circulation system 16 as necessary during the washing step, the rinsing step, and the like. Has a function to improve. This water circulation system 16 drives the circulation pump 20 so that the washing water in the water tank 3 is drained from the drain pipe 8a, the drain filter 8b, the water circulation path 31 to the circulation pump 20, the circulation pump 20, and the water circulation. It repeats returning in the water tank 3 via the discharge side path | route 31b from the circulation pump 20 of the path | route 31 in order.

  In addition, selection of a mode such as an operation course and various functions is performed by inputting from an operation panel 21 provided at the upper front of the washing machine body 2. The control unit 22 displays on the display unit on the operation panel 21 based on the input information and notifies the user. At the same time, when the operation start is set by the input setting unit of the operation panel 21, data is input from a water level detection unit or the like that detects the water level in the water tank 3, and driving is started. Thereby, the control part 22 controls operation | movement of a drain valve, a water supply valve, etc., and performs operation | movement, such as washing, dehydration, and drying.

The rotating drum 4 has a motor 5 on the water tank 3 directly connected to a rotating shaft. The rotating drum 4 is installed with the water tank 3 such that the rotation axis is inclined at an angle θ = 20 ± 10 degrees from the horizontal direction from the opening side (left side in FIG. 1) to the bottom side (right side in FIG. 1). Yes. As a result, even if the rotary drum 4 is installed at the same height as compared with the case of installation in the horizontal direction, the opening of the water tank 3 and the rotary drum 4 is obliquely upward, so that an unreasonable posture of bending is taken. You can easily put in and out laundry. In particular, from the experience of the present inventors, by setting the inclination angle to 20 ± 10 degrees,
Even if there was a difference in height from children (excluding infants) to adults, and even wheelchair users, it was possible for them to carry out laundry work most easily. Further, the washing water supplied into the rotating drum 4 accumulates on the back side, and a deep water storage state can be obtained even with a small amount of water. The water tank 3 is provided to have the same inclination as that of the rotating drum 4 and along the vicinity thereof in order to make water supply work efficiently on the laundry in the rotating drum 4. An opening / closing door 40 is provided on the front surface of the washing machine body 2. The opening / closing door 40 can be sealed and opened via a sealing material 14 having the opening 13 of the water tank 3 attached to the mouth edge thereof.

  In addition, the drive of the rotating drum 4 is performed by a continuous rotation at a high speed of 1000 rpm, for example, the dehydration step. For this reason, the laundry is attached to the inner surface of the rotating drum 4 while being entangled, twisted and twisted in the washing step and the rinsing step. Therefore, it is difficult to take out the laundry, and post processing is troublesome. In addition, it is easy to leave hard wrinkles on the laundry, and it takes a lot of time to remove the wrinkles.

  In order to solve this problem, in this embodiment, in the washing step or the washing step and the rinsing step, the forward positive arc rotation and the sudden reverse arc rotation of the rotating drum 4 exceeding 90 degrees and less than 180 degrees are alternately repeated. A reverse arc rotation drive mode is provided. Further, in the washing step or the washing step and the rinsing step, the continuous rotation of the rotating drum 4 at the rotation speed showing the behavior in which the laundry lifted by the rotation of the rotating drum 4 falls from the height where its own weight wins is reversed. It has a forward and reverse continuous rotation drive mode that repeats alternately. Further, the forward / reverse arc rotation drive mode and the forward / reverse continuous rotation drive mode are alternately executed in the washing step or the washing step and the rinsing step. As a result, the tangling and twisting of the laundry is greatly improved, and the function of the mechanical force is enhanced, so that wrinkles are hardly generated.

  That is, in the present embodiment, the laundry is lifted up to more than 90 degrees and less than 180 degrees by arc rotation and rapid braking of the rotating drum 4 at a rapid speed exceeding 90 degrees and less than 180 degrees. After that, a sudden braking at the final stage of lifting the laundry causes a braking state, and it is ensured that the laundry is peeled off from the inner surface of the rotating drum 4 by its inertia and its own weight and dropped by its own weight to the side opposite to the lifting side. Can be achieved. Therefore, a particularly high unraveling action can be given to the laundry that is sufficiently swollen and contains water and is loose and slippery, and mechanical force can be exerted on the laundry. Thereby, cleaning performance can be improved.

  Furthermore, the forward / reverse arc rotation drive mode is established by alternately repeating the forward / reverse rapid arc rotation in the forward direction and the reverse sudden arc rotation in the reverse direction. The lifting position and the falling position of each can be alternately switched in the left and right in each arc rotation drive. Accordingly, the unlocking action can be further enhanced while preventing the laundry from becoming entangled, and the number of times that the mechanical force is exerted on the laundry can be increased. Therefore, the cleaning performance can be improved. Moreover, the entanglement of the laundry which arises because a washing | cleaning and a rinsing step progress can be suppressed by a high unraveling effect | action. Therefore, it is possible to continuously carry out effective tapping in the forward / reverse arc rotation drive mode and enhance the cleaning effect and the rinsing effect.

Further, in the forward / reverse arc rotation drive mode alone, the tangling, twisting, wrinkles, etc. of the laundry are reduced, but the vertical position of the laundry is difficult to change, and the laundry at the bottom of the rotating drum 4 is difficult to move. Uneven washing. However, by using the forward / reverse continuous rotation drive mode in combination, it is possible to realize a change in the position of the laundry in the vertical direction. In other words, the combined use of the forward / reverse continuous rotation drive mode reduces tangling, twisting, and wrinkling of the laundry only in the forward / reverse continuous rotation drive mode, and the mechanical force imbalance on the laundry in the forward / reverse arc rotation drive mode. Reduce. This makes it possible to give two different behaviors to the laundry being washed and rinsed by both modes. Specifically, depending on the forward / reverse arc rotation drive mode, it is possible to give a firm hand-washing behavior while reducing tangling, twisting, and wrinkling of the laundry. Furthermore, depending on the forward / reverse continuous rotation drive mode, it is possible to provide an effective washing behavior against uniform and strong soiling, washing the laundry largely and continuously while reducing unevenness.

  In the drying step, in particular, when the forward / reverse arc rotation drive mode is executed, it is suitable for stretching the wrinkles of the laundry after dehydration, and the finishing quality can be improved to each stage and the post-finishing can be greatly reduced. However, since the laundry in the drying step is light and may be difficult to stick to the inner surface of the rotating drum 4, it is preferable to set the rotation angle of the rotating drum 4 to 90 ° or more and less than 200 °.

  The maximum rotation speed of the rotating drum 4 in the forward / reverse continuous drive mode may be 45 ± 5 rpm as usual. The maximum rotation speed of the rotating drum 4 in the forward / reverse arc rotation driving mode is preferably 40 rpm or more in the washing and rinsing steps and 50 rpm or more after dehydration.

  Here, the circulation pump 20 will be described. As shown in FIG. 1, the circulation pump 20 is fixed on a base plate 2 a that is the bottom of the washing machine body 2. Specifically, as shown in FIGS. 2A to 2C, the circulation pump 20 has an opening side of a resin pump casing 20 b containing the impeller 20 a at the front end of the metal motor casing 20 d of the circulation motor 20 c. The bearing partitions 20d1 are integrated with each other. The impeller 20a is directly connected to the motor shaft 20e, and the impeller 20a is fitted on a resin mounting seat 35. The mounting seat 35 has substantially C-shaped mounting pieces 35a at three locations around the mounting seat 35. The circulating pump 20 is attached to the base plate 2a by screwing these attachment pieces 35a into bosses (not shown) on the base plate 2a with bolts (not shown). The circulation pump 20 absorbs water through an L-shaped suction port 20f formed integrally with the lower part of the pump casing 20b. Thereafter, the washing water is discharged from the peripheral wall of the water tank 3 through the discharge side passage 31b through the discharge port 20g integrally formed in the tangential direction of the pump casing 20b.

  Next, the water circulation system 16 will be described. The water circulation system 16 circulates the wash water in the water tank 3 into the rotating drum 4 by the circulation pump 20 provided in the water circulation path 31 through the water circulation path 31 connected to the water tank. First, as shown in FIG. 1 and FIGS. 3A to 3C, an injection port 51 is formed in the lowermost part of the front end wall 3 h around the opening 13 of the water tank 3. The discharge side path 31b of the water circulation path 31 is connected to the injection port 51 from the outer surface. As indicated by solid line arrows D1 and D2 in FIG. 1, circulating water (water tank) from the discharge-side path 31b between the back surface of the front end wall 3h of the water tank 3 and the surface of the front end wall 4b of the rotating drum 4 corresponding thereto. 3, the case where the washing water supplied in 3 circulates through the water circulation path 31 is hereinafter referred to as circulating water). Thereby, water is discharged into the rotating drum 4 through the flow path 52 formed between the front end wall 3 h of the water tank 3 and the surface of the front end wall 4 b of the rotating drum 4. The motor rotation speed of the circulation pump 20 at this time is set to 3500 rpm, for example. Since the water injection port 51 from the discharge side passage 31b is not in contact with the laundry in the rotary drum 4, the laundry is caught by the injection port 51, disturbing the behavior required for easy washing and drying. Or damaging or tearing the laundry. Moreover, the appearance which looks good is not spoiled. In addition, since the flow path 52 is formed between the front end wall 3h of the water tank 3 and the front end wall 4b of the rotating drum 4, no special parts are required, and a seal member 56 (see FIG. 3C) described later is used. The degree of structure is simple and inexpensive, and the risk of water leakage is reduced.

As shown in FIG. 3C, the injection port 51 opens in the direction of the rotation center of the rotary drum 4 on the back surface of the front end wall 3 h of the water tank 3. Specifically, the injection port 51 is formed between the front end wall 3 h of the water tank 3 and the front end wall 4 b of the rotating drum 4, and opens toward the annular outlet 53 that is a part of the flow path 52. Therefore, the circulating water ejected from the ejection port 51 is efficiently discharged from the flow path 52 to the rotation center side of the rotating drum 4 as indicated by the solid line arrow D. Specifically, it is efficiently discharged into the inner rotation area of the rotary drum 4 in the radial direction toward the annular outlet 53. Therefore, it is possible to efficiently supply washing water regardless of the amount of laundry. In particular, the front end wall 3h of the water tank 3 includes an inclined surface 3h1 inclined toward the rear side of the washing machine body 2 from a position corresponding to the injection port 51 toward the inner periphery, and a rotating drum from the inclined surface 3h1 to the inner periphery. 4 having a curved surface 3h2 curved toward the opening 54 side. As a result, the circulating water jetted into the flow path 52 extends from the inclined surface 3h1 along the curved surface 3h2 through the opening 54 of the rotating drum 4 as shown by the arrow D in FIG. It is made to discharge toward. Therefore, the supply efficiency of the circulating water to the laundry can be increased.

  Here, the front end wall 3h of the water tank 3 is formed with a connection port 51a to which the discharge side passage 31b is connected. The injection port 51 through which the circulating water is injected from the connection port 51a into the flow path 52 is opened to the flow path 52 in a predetermined range W1 in the circumferential direction toward the rotation center side of the rotary drum 4. Thus, in order to provide the connection port 51 a on the front end wall 3 h of the water tank 3, the circulating water from the discharge side passage 31 b is passed through the injection port 51 by forming the injection port 51 that opens toward the flow path 52. Guide to the flow path 52 side without any disturbance. Accordingly, the circulating water is left and right in the predetermined direction from the predetermined area W2 of the annular outlet 53 corresponding to the predetermined range in the circumferential direction of the injection port 51 in the rotating drum 4 (left and right as viewed from the front of the washing machine body 2). It is possible to discharge stably with the spread. As a result, the circulating water flowing in from the connection port 51a is guided to the flow path 52 by the ejection port 51 without being disturbed. As a result, the circulating water is stably discharged from the circumferential range corresponding to the injection port 51 in a predetermined direction with a lateral expansion, and is gradually discharged into the laundry in the rotating drum 4. Regardless of the stable supply.

  Further, the ejection port 51 guides the circulating water to the opening to the flow channel 52 between the ejection port 51 and the connection end 55d of the discharge side path 31b connected to the connection port 51a. As a result, the ejection port 51 provided at the connection port 51a to which the discharge side path 31b is connected guides the circulating water to the flow path 52 side, so that the connection end 55d to the connection port 51a of the discharge side path 31b. A suitable guide condition can be satisfied by the combined form of the mutual simple shapes in cooperation with. In other words, in order to guide the circulating water to the flow path 52 side, the above-mentioned simple shape of the combined form allows a large discharge flow width in the circumferential direction, a sufficient discharge flow thickness in the front and rear direction, and a discharge that can increase the landing distance Guidance that satisfies the conditions of working favorably regardless of the amount of laundry, such as flow velocity, can be provided. Moreover, the piping structure is not particularly complicated, does not increase the risk of water leakage, and does not cause an increase in cost.

  Further, as shown in FIGS. 1 and 3A to 3C, the injection port 51 opens at substantially the center position of the bottom portion of the front end wall 3h of the water tank 3, and the injection port 51 and the front end of the discharge side path 31b are connected to each other. They are connected by a resin duct 55 shown in FIGS. 3A and 3B. The duct 55 is formed flat in the front and rear direction by combining two front and rear members 55a and 55b. The discharge side path 31 b is biased to one side in the left-right direction with respect to the opening position of the injection port 51 and extends forward in parallel with the axis of the water tank 3 from the circulation pump 20. Further, the duct 55 is connected to the discharge side passage 31b as an extension by a connection pipe 55c integrally formed at one end of the rear member 55b. Further, the duct 55 extends substantially horizontally from the one end side of the rear member 55 b to near the lower portion of the injection port 51, and then the other end side is curved and rises to the injection port 51. Further, as shown in FIG. 3C, the connection portion 55e is integrally formed with the rear member 55b of the connection end portion 55d that is the rising portion of the rear member 55b. The connection portion 55e and the connection port 51a that opens to the front end wall 3h of the water tank 3 of the injection port 51 are connected via a seal member 56, and both are fixed by screwing with screws 57.

In this manner, the duct 55 connected to the circulation pump 20 side by extending from the connection portion 55e of the front end wall 3h of the water tank 3 to the connection port 51a to the outer periphery of the water tank 3 is flattened back and forth. A small space between the front end wall 3h of the machine and the front wall of the washing machine body 2 can be piped. In addition, due to the flat shape of the duct 55, the circulating water is rectified into a water flow width and a water flow thickness suitable for the opening of the injection port 51 and the like, and is injected from the connection port 51 a toward the injection port 51 into the flow channel 52. You can As a result, the circulating water can be satisfactorily supplied from the annular outlet 53 without being disturbed by the flow in a discharge speed region in which the water landing distance can be increased with a large discharge width in the front-rear direction with a large circumferential discharge width. Therefore, the washing and rinsing effect can be further enhanced.

  In addition, the duct 55 extends in the lateral direction from the outer periphery of the water tank 3 to below the vicinity of the connection port 51a of the injection port 51 in the lower part of the front end wall 3h, and from the connection end 55d that is a rising portion curved to the connection port 51a. It is connected to the connection port 51a. Therefore, the circulating water rectified into a flat flow is led to the connection port 51a and the injection port 51 whose flat directions coincide with each other without being disturbed by the curved shape of the connection end 55d that is the rising portion, and the circumferential direction predetermined region of the flow path 52 Can be injected. Accordingly, the washing water can be more stably discharged from the wider area of the annular outlet 53, and the function of the washing water on the laundry can be enhanced.

  In particular, the injection port 51 is connected to the front end wall 3h of the water tank 3 by a receiving wall 51c that is formed integrally with the front end wall 4b of the rotary drum 4 in parallel with the connection port 51a. It forms so that it may open toward the cyclic | annular exit 53 between edge tops. The connecting portion 55e is provided with a throttle wall 55f between the receiving wall 51c and smoothly narrowing the injection passage toward the injection port 51 from the duct 55 side on the rounded surface. Circulating water from the duct 55 toward the injection port 51 is energized by the throttle wall 55f, and a high-speed flow that strongly follows the inclined surface 3h1 and the curved surface 3h2 on the back surface of the front end wall 3h of the water tank 3 is obtained. That is, an aperture space S is formed between the inclined surface 3 h 1 and the curved surface 3 h 2 and the front end wall 4 b of the rotating drum 4. Thus, the circulating water is reliably discharged into the rotating drum 4 obliquely upward and backward in a predetermined path, and draws a parabola while spreading to the left and right, and the laundry in the rotating drum 4 from a wide area on the longer flight path. Can be provided.

  However, the throttle passage for making the high-speed flow may be formed in any way between the connection end portion 55e of the duct 55 to the connection port 51a and the injection port 51. That is, in order to guide the circulating water flowing in from the injection port 51 provided in the connection port 51a to the channel 52 side, the discharge side length 31b is aligned with the connection end 55e to the connection port 51a in a simple shape. Depending on the form, it is possible to provide guidance that satisfies conditions that work favorably regardless of the amount of laundry, such as a large discharge flow width in the circumferential direction, a sufficient discharge flow thickness in the front-rear direction, and a discharge flow speed that can increase the landing distance. Moreover, the piping structure is not particularly complicated, does not increase the risk of water leakage, and does not cause an increase in cost.

  Here, as shown in FIG. 4A, the front end wall 4 b of the rotating drum 4 has a substantially elliptical shape (including an elliptical shape) when viewed from the front of the rotating drum 4. That is, the front end wall 4b has a front end wall diameter large portion 4b1 and a front end wall diameter small portion 4b2. Therefore, when the rotating drum 4 is rotating, the front end wall 4b of the rotating drum 4 at the corresponding position of the injection port 51, that is, the lowermost portion, is as shown in FIG. The front end wall diameter small portion 4b2 is positioned in the vertical direction and moved upward as shown in FIG. 4C. When the front end wall diameter large portion 4b1 is positioned in the vertical direction, that is, when the front end wall 4b moves downward at the corresponding position of the injection port 51, the front end wall 4b is lower than the curved surface 3h2 of the front end wall 3h of the water tank 3. Position. Therefore, when the circulating water is discharged from the annular outlet 53, it is suppressed to the curved surface 3h2, and is discharged downward of the rotating drum 4 as indicated by the solid line arrow D1. Further, when the front end wall small diameter portion 4b2 is positioned in the vertical direction, that is, when the front end wall 4b moves upward at the corresponding position of the injection port 51, the front end wall 4b is more than the curved surface 3h2 of the front end wall 3h of the water tank 3. Is higher. Therefore, when circulating water is discharged from the annular outlet 53, it is pushed up to the front end wall 4b and discharged toward the upper side of the rotating drum 4 as indicated by a solid arrow D2.

Therefore, when the front end wall 4b is at the lowest point at the corresponding position of the injection port 51, that is, at the bottom, that is, when the front end wall diameter large portion 4b1 is positioned in the vertical direction, the circulating water is initially Discharge toward the lower side of the rotating drum 4. When the rotating drum 4 is rotated, the front end wall 4b gradually rises, the direction of circulating water discharge also changes upward, and the front end wall small diameter portion 4b2 is positioned vertically when rotated 90 ° from the starting point. The front end wall 4b reaches the top stop point and is discharged toward the upper side of the rotating drum 4. Further, when the rotating drum 4 is rotated, the front end wall 4b is gradually lowered, the direction of circulating water discharge is gradually changed upward, and the front end wall 4b reaches the bottom stop point when rotated 180 ° from the starting point. Then, the ink is discharged downward of the rotary drum 4. When the rotating drum 4 is rotating, the above operation is repeated, and the discharge direction of the circulating water always changes from the lower side to the upper side and from the upper side to the lower side. Can be provided. As a result, it is possible to enhance the detergent dissolving effect, washing effect, and rinsing effect.

  In addition, for example, even when there are a lot of clothes or when washing large clothes such as futons and blankets, it is possible to avoid the situation where circulating water is supplied only to the local areas, and to reduce unevenness in washing performance and rinsing performance. .

  Furthermore, as another example of the front end wall 4b of the rotating drum 4, as shown in FIG. 5, the surface of the front end wall 4b of the rotating drum has a substantially polygonal shape (including a polygonal shape) when viewed from the front of the rotating drum 4. can do. Thereby, when the rotating drum 4 rotates and the apex direction of the polygon on the front end wall surface, that is, when the front end wall diameter large portion 4b3 approaches the annular outlet 53 of the circulating water, the discharge direction is directed downward. When the center side of the polygonal side, that is, when the front end wall diameter small portion 4b4 approaches the annular outlet 53 of the circulating water, the discharge direction is directed upward. In this way, the circulating water can be uniformly sprayed onto the laundry. Further, when the rotating drum 4 rotates once, the circulating water is discharged while changing up and down by the number of polygonal vertices. Therefore, if the number of vertices of the polygon is large, the discharge direction can be changed frequently when the drum rotates once.

  In the said embodiment, the front-end wall 4b surface of the rotating drum was elliptical shape or polygonal shape seeing from the front of the rotating drum 4. However, even if the shape is not a line-symmetrical shape such as an ellipse or a polygon, it has a shape in which the distance from the rotational axis changes to at least two near and far due to the rotation of the rotating drum. Good.

  In addition, in this Embodiment, although it was set as the structure which installs the circulation pump 20 on the baseplate 2a which is the bottom part of the washing machine main body 2, it is not limited to this. In order to circulate the washing water in the water tank 3, the structure which installs the circulation pump 20 in the lower part 3b (refer FIG. 1) of the water tank 3 may be sufficient, and there can exist an effect equivalent to this Embodiment.

  As described above, the rotation axis direction of the rotating drum formed in the bottomed cylindrical shape and the rotating drum from the front side to the bottom side to the bottom side becomes horizontal or inclined downward from the horizontal direction. A water tank disposed inside, a motor for rotating the rotating drum, a controller for controlling the motor to execute at least one of a washing step and a rinsing step, and washing water in the water tank connected to the water tank A water circulation system that circulates in the rotating drum by a circulation pump provided in the water circulation path through the water circulation path, and the water circulation system includes an injection port provided on the back surface of the front end wall of the water tank, the back surface of the front end wall of the water tank, and the rotating drum. A flow path formed between the front end wall surface and the front end wall surface of the rotating drum has a shape in which the distance from the rotation axis changes due to the rotation of the rotating drum, and is injected from the injection port. And a configuration in which the ring water is discharged into the rotary drum through the passage.

With such a configuration, it is possible to enhance the functions such as washing and rinsing by sucking the water in the water tank and returning it to the water tank and circulating it by the circulation pump and the water circulation path of the circulation system. In particular, only the water circulation path is connected to the front end wall of the water tank, and no special piping connected to the flow path formed between the front end walls of the water tank and the rotating drum is required. Therefore, the risk of water leakage is low, and the circulating water can be discharged into the rotating drum with a simple and inexpensive piping structure. Even if the circulating water discharge port is not specially shaped and structured, the rotating drum rotates to change the direction of circulating water discharge because the front end wall surface of the rotating drum changes in distance from the rotation axis. It can be changed in the vertical direction. Therefore, circulating water can be evenly sprayed onto the laundry without using a complicated structure, regardless of the amount and type of the laundry put into the water tub. Therefore, it is possible to effectively increase the cleaning power while suppressing unnecessary cost increase.

  Further, the surface of the front end wall of the rotating drum has a shape in which the distance from the rotation axis changes to at least two near and far due to the rotation of the rotating drum. With this configuration, when the rotating drum rotates and, for example, the apex direction of the polygon or the long axis direction of the ellipse approaches the discharge port portion of the circulating water, the discharge direction is directed downward. For example, when the central direction of the polygonal side or the minor axis direction of the ellipse approaches the discharge port of the circulating water, the discharge direction is directed upward. Thereby, circulating water can be uniformly sprayed on a laundry.

  Further, the front end wall surface of the rotating drum has an elliptical shape when viewed from the front of the rotating drum. With this configuration, when the rotating drum rotates and the major axis direction of the ellipse on the front end wall surface approaches the discharge port portion of the circulating water, the discharge direction is directed downward. When the minor axis direction of the ellipse approaches the discharge port portion of the circulating water, the discharge direction is directed upward. Thereby, circulating water can be uniformly sprayed on a laundry. In addition, since there are two places in each of the major axis direction and the minor axis direction, when the drum rotates once, the circulating water is discharged while changing up and down twice.

  Further, the front end wall surface of the rotating drum has a polygonal shape when viewed from the front of the rotating drum. With this configuration, when the rotating drum rotates and the apex direction of the polygon on the front end wall surface approaches the discharge port of the circulating water, the discharge direction is directed downward. When the central direction of the side of the polygon approaches the discharge port of the circulating water, the discharge direction is directed upward. Thereby, circulating water can be uniformly sprayed on a laundry. When the drum rotates once, the circulating water is discharged while changing up and down by the number of polygon vertices. Therefore, if the number of vertices of the polygon is large, the discharge direction changes frequently when the drum rotates once.

  In a drum-type washing machine with a rotating drum installed horizontally or inclined, it is possible to circulate the water in the aquarium in a process such as washing too easily. Even if the discharge port of the circulating water is not specially shaped and structured, the surface of the front end wall of the rotating drum changes in distance from the rotation axis, so that the rotating drum rotates and moves the circulating water discharge direction up and down. Because it can be changed in direction, it is possible to suppress unnecessary cost increase by injecting circulating water evenly into the laundry regardless of the amount and type of laundry put into the aquarium without using a complicated structure. Since the cleaning power can be increased effectively, the rotating drum formed in the bottomed cylindrical shape has a rotation axis direction that is horizontal or inclined downward from the horizontal direction from the front side to the bottom side. To be And it was placed in a water tank, which is useful as a drum type washing machine for washing laundry accommodated in the rotating drum by rotating the rotary drum.

3 Water tank 3h Front end wall of water tank 4 Rotating drum 4b Front end wall of rotating drum 5 Motor 16 Water circulation system 20 Circulation pump 31 Water circulation path 52 Flow path

Claims (4)

A rotating drum formed in a bottomed cylindrical shape, and the rotating drum are arranged inside such that the rotating shaft direction is horizontal or inclined downward from the horizontal direction from the opening front side to the bottom rear side. A water tank that rotates, a motor that rotationally drives the rotating drum, control means that controls the motor and the like to perform at least one of a washing process and a rinsing process, and a circulation in which washing water in the water tank is connected to the water tank A water circulation system that circulates by a circulation pump through a path, wherein the water circulation system is configured such that circulating water sprayed from an injection port provided on the back surface of the front end wall of the water tank is the front end wall back surface of the water tank and the front end wall of the rotating drum. The surface of the front end wall of the rotating drum is changed in distance from the rotation axis by rotating the rotating drum. Drum-type washing machine according to claim. The drum type washing machine according to claim 1, wherein a surface of the front end wall of the rotating drum has a shape in which the distance from the rotation axis is changed to at least two near by the rotation of the rotating drum. The drum type washing machine according to claim 1 or 2, wherein a front end wall surface of the rotating drum has a substantially elliptical shape when viewed from the front of the rotating drum. The drum type washing machine according to claim 1 or 2, wherein the front end wall surface of the rotating drum has a substantially polygonal shape when viewed from the front of the rotating drum.

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