JP2010046125A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To infiltrate water in laundry inside a drum without irregularities and to prevent the generation of air intrusion sound of a circulation pump. <P>SOLUTION: In the washing machine including a circulating water sprinkler for sucking water inside a water tub 6 through a circulation water path by the pump action of the circulation pump, delivering it from a water outlet 40 into a drum 11 and into the water tub 6 and circulating it, wherein a pump motor whose rotation speed can be controlled is used for the drive source of the circulation pump, and by changing the rotation speed of the pump motor in the middle of water supply in a washing step or during the washing step, a flexible shower operation for varying the discharge amount of the water from the water outlet 40 is executed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a washing machine having a function of sucking water in a water tank through a circulating water channel by a pumping action of a circulation pump and discharging the water from a water discharge port into a rotating tank.

Conventionally, for example, a drum-type washing machine has a circulation channel and a circulation pump for the purpose of improving washing performance and saving water, and by driving the circulation pump at the time of washing or rinsing laundry, Is considered to be configured to be sucked through the circulation water channel and discharged from the water discharge port into the drum (rotating tank) (in the water tank) and circulated. For example, a washing machine described in Patent Document 1 is known. In this washing machine, water (detergent solution) discharged from the water discharge port into the drum is applied to the laundry stored in the drum.
Japanese Patent Laying-Open No. 2005-87466

  Since the pump motor of the conventional circulation pump is only operated at a constant rotation speed (number of rotations), the discharge position (discharge position) of water discharged from the water discharge port into the drum is almost the same position. There was a drawback that it would. In this case, there is a possibility that the penetration of water (detergent liquid) may be uneven between the laundry on the front side and the laundry on the back side in the drum.

  Therefore, an object of the present invention is to soak water uniformly into the laundry in the drum, and so-called air noise that causes air to enter the circulation pump due to a lack of water in the drum and generate abnormal noise. It is an object of the present invention to provide a washing machine that can prevent the occurrence of water.

  In order to achieve the above-described object, the present invention provides a water tank capable of storing water and having a water outlet at the bottom, a hole capable of passing water, and rotatably disposed in the water tank. A rotating tank in which an object is accommodated and rotated by a driving means; a water discharge port provided so as to face the inside of the rotating tank; one end portion is connected to the water discharge port; A circulating water channel connected to the discharge port, and provided in the middle of the circulating water channel, sucks water in the water tank through the water discharge port and discharges the sucked water from the water discharge port into the rotating tank. In a washing machine comprising a circulating pump to be controlled and a control means for controlling the circulating pump, the circulating pump uses a pump motor capable of controlling a rotational speed as a driving source, and the controlling means is in the middle of water supply of a washing process. Or during the washing process, The controller is configured to execute a flexible shower operation in which the amount of water discharged from the water discharge port is varied by changing a rotation speed. The motor is configured to operate, and the control means is configured to determine whether or not to execute the flexible shower operation based on a water pressure detection result during water supply.

  By performing a flexible shower operation that varies the amount of water discharged from the water discharge port by changing the rotation speed of the pump motor during or during the water supply of the washing process, the entire laundry in the rotating tub is uneven. It becomes possible to pour water without. In addition, since the pump motor is operated when the predetermined water level is reached from the start of water supply, it is possible to prevent the generation of air stray noise from the circulation pump. Further, since it is configured to determine whether or not the flexible shower operation can be performed based on the detection result of the water pressure during the water supply, when the water pressure is low, that is, when the flexible shower operation is performed, the circulating pump air is heard. When the possibility of occurrence is high, it can be set not to execute the flexible shower operation.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, in FIGS. 1 and 2, the outer box 1 has a rectangular box shape, and a base plate 3 having legs 2 at the bottom is provided. A laundry doorway 4 is formed at the front portion (left side in FIG. 1) of the outer box 1, and a door 5 for opening and closing the laundry doorway 4 is rotatably provided via a hinge (not shown). .

  In the outer case 1, a water tank 6 capable of storing water is disposed via an elastic support mechanism 7. The water tank 6 has a bottomed cylindrical shape whose front surface is open and whose rear surface is closed, and is arranged so that the axial direction is inclined upwardly from the horizontal direction. An annular water tank cover 8 is attached to the front of the water tank 6. As shown in FIG. 4, the water tank cover 8 includes a first projecting portion 8a projecting in the center direction from the peripheral wall portion of the water tank 6, and a short cylinder projecting forward from the tip of the first projecting portion 8a. First projecting portion 8b, a second projecting portion projecting in the center direction from the distal end portion of the first projecting portion 8b, and a short cylindrical shape projecting forward from the distal end portion of the second projecting portion And the inner peripheral portion of the second protrusion is the opening 9. A bellows 10 that can be elastically deformed is provided between the tip of the second protrusion and the laundry entrance 4, and the bellows 10 allows the opening 9 of the water tank 6 and the laundry entrance 4 to be connected. There is a watertight and airtight connection. The bellows 10 is formed with a curved portion 10a that is curved rearward (right side in FIG. 4) at an intermediate portion in the front-rear direction.

  In the water tank 6, a drum 11 which is a rotating tank is rotatably arranged. Similarly to the water tank 6, the drum 11 has a bottomed cylindrical shape whose front surface is open and whose rear surface is closed, and is arranged so that the axial direction is inclined upward from the horizontal direction. A plurality of holes 12 through which water and air can be passed are formed in the peripheral wall portion of the drum 11, and a plurality of baffles 13 (only one is shown in FIGS. 1 and 2) are provided on the inner surface of the peripheral wall portion. . An annular balance ring 14 is provided at the front portion of the drum 11, and an opening 15 in the inner peripheral portion of the balance ring 14 communicates with the laundry entrance 4.

  The drum 11 is directly rotated by a drum motor 16 provided on the back side of the water tank 6. The drum motor 16 is constituted by, for example, an outer rotor type DC brushless motor, and functions as a driving unit for the drum 11. In the drum 11, the laundry is accommodated so as to be able to be taken in and out from the laundry entrance 4. The drum 11 functions as a shared tank for washing, rinsing and dehydrating laundry.

  One end of a drain pipe 20 is connected to a drain port 19 provided at the lowermost part of the rear part of the water tank 6. The drain port 19 also serves as the water discharge port in the present invention. The other end of the drain pipe 20 is connected to the inlet of the filter case 22 of the filter unit 21 constituting the lint capturing unit. A filter cap 23 is detachably attached to the front portion of the filter case 22, and a lint filter (not shown) is provided on the filter cap 23. Therefore, the lint filter is detachably attached to the filter case 22 via the filter cap 23.

  A circulation pump unit 25 is provided on the downstream side of the filter unit 21 so as to be positioned on the base plate 3. The circulation pump 26 of the circulation pump unit 25 includes a pump unit 27 and a pump motor 28 as a drive source, and a pump action is achieved by rotating an impeller (not shown) provided in the pump unit 27 by the pump motor 28. Demonstrate. As the pump motor 28, a motor capable of easily controlling the rotation speed, for example, a brushless motor is used. The pump motor 28 is provided with a cooling fan 28a that is positioned opposite to the pump unit 27 and rotated by the pump motor 28. When the pump motor 28 is driven, the pump motor 28 itself is driven by the cooling fan 28a. It can be cooled. The cooling fan 28a is not necessarily required, and may be provided as necessary.

  One end of a circulation pipe 29 is connected to the discharge port 27a (see FIG. 2) of the pump unit 27. The other end of the circulation pipe 29 extends upward and is connected to the water discharge port body 32 through a joint 30 and a connection port portion 31 provided on the upper part of the water tank cover 8.

  The joint 30 integrally includes a fixed portion 30a, a first connecting portion 30b having a horizontal cylindrical shape, and a second connecting portion 30c having a downward cylindrical shape. The part 30b and the second connection part 30c communicate with each other. The joint 30 is a state in which the second connection portion 30c is fitted from above into the connection port portion 31 having a cylindrical shape projecting on the outer surface side of the first projection portion 8b of the water tank cover 8. The fixed portion 30 a is attached to the aquarium cover 8 by screwing the fixed portion 30 a to the boss portion 33 provided on the outer surface of the first protrusion 8 b of the aquarium cover 8. Then, in a state where the other end portion of the circulation pipe 29 is fitted to the first connection portion 30 b of the joint 30 from the outside, a wire spring hose stopper is formed from the outside of the other end portion of the circulation pipe 29. By attaching 35, the other end portion of the circulation pipe 29 is connected to the first connection portion 30b in a retaining state.

  The interior lamp 36 is attached to the first protrusion 8 b of the water tank cover 8 so as to be positioned in the vicinity of the other end of the circulation pipe 29. The interior lamp 36 is for illuminating the inside of the drum 11. A protective cushion 37 for protecting the circulation pipe 29 is attached near the other end of the circulation pipe 29.

  The water discharge port body 32 is disposed on the inner peripheral surface side of the first protrusion 8 b in the water tank cover 8. The water discharge port body 32 is made of a material having high elasticity, in this case, EPDM (ethylene-propylene rubber). A water discharge port 40 is formed in the water discharge port body 32, and water supplied from the circulation pipe 29 through the joint 30 and the connection port portion 31 is supplied from the water discharge port 40 to the inside of the drum 11. It is configured in a shape that can be diffused and discharged toward the rear (see FIG. 3).

  A drain valve 46 is connected to the downstream side of the circulation pump unit 25 via a connection pipe, and a drain hose 47 is connected to the drain valve 46. Here, the drain pipe 20, the filter case 22 of the filter unit 21, the pump part 27 of the circulation pump unit 25, the circulation pipe 29, the joint 30, and the connection port part 31 constitute a circulation water channel 48. ing. Further, the circulating water channel 48, the circulation pump unit 25, and the water discharge port body 32 (water discharge port 40) constitute a circulation water spray device 49.

  In the case of this configuration, when water is supplied into the aquarium 6 with the drain valve 46 closed, the water is discharged from the drain port 19, the drain pipe 20, the filter case 22, the pump unit 27 of the circulation pump unit 25, It enters and is stored through the connection pipe 45 to just before the drain valve 46. The water supplied more than that is stored in the water tank 6. When the pump motor 28 of the circulation pump 26 is driven in this state, the water in the water tank 6 is sucked into the pump portion 27 through the drain pipe 20 and the filter case 22 by the pump action of the circulation pump 26, and the pump The water in the section 27 is discharged from the discharge port 27a to the circulation pipe 29 side, passes through the circulation pipe 29, the joint 30, the connection port portion 31, and the water discharge port body 32, and passes from the water discharge port 40 to the inside of the drum 11. As a result, it is discharged into the water tank 6. Thereby, the water in the water tank 6 comes to circulate through the circulation water channel 48 (refer arrow A of FIG.1 and FIG.2). Further, when the drain valve 46 is opened in a state where water is stored in the water tank 6, the water in the water tank 6 flows from the drain port 19 to the drain pipe 20, the filter case 22, and the pump part of the circulation pump unit 25. 27, the pipe 45, the drain valve 46, and the drain hose 47 are discharged out of the machine.

  Further, as shown in FIG. 2, an overflow port 50 is provided on the left outer peripheral portion of the first projecting portion 8 b in the water tank cover 8 so as to be located slightly below the central portion in the vertical direction. An upper end portion of the overflow pipe 51 is connected to the overflow port 50. The lower end of the overflow pipe 51 is connected to a portion of the drain hose 47 near the drain valve 46. Therefore, when the water in the water tank 6 exceeds the overflow port 50, the water is discharged from the overflow port 50 through the overflow pipe 51 and the drain hose 47 to the outside of the apparatus.

  As shown in FIG. 2, an operation panel 56 provided with an operation unit 55 and a display unit (not shown) is provided at the top of the front surface of the outer box 1, and a microcomputer is installed on the back side of the operation panel 56. A control device 57 (see FIG. 1) is provided. This control device 57 constitutes the control means of the present invention. A water supply valve 58 is provided at the rear part of the upper part in the outer box 1, and a water supply case 59 is provided at the front part, and the outlet of the water supply valve 58 is connected to the water supply case 59 via the water supply pipe 60. . Although not shown, a hose connected to a tap is connected to the water inlet 58a of the water supply valve 58. A detergent is introduced into the water supply case 59. The lower part of the water supply case 59 is connected to a water supply port 62 provided in the upper part of the water tank 6 through a water supply hose 61.

  In this configuration, when the water supply valve 58 is opened, tap water is supplied to the water supply case 59 via the water supply pipe 60, and the water is supplied via the water supply hose 61 together with the detergent introduced into the water supply case 59. It is supplied into the water tank 6 and eventually into the drum 11.

  The control device 57 includes an operation unit 55 provided on the operation panel 56, a water level sensor (not shown) for detecting the water level in the water tank 6, and a rotation sensor (not shown) for detecting the rotation speed of the drum motor 16. ), A signal from a rotation sensor (not shown) for detecting the rotation speed of the pump motor 28 is input. The rotation sensor is composed of, for example, a Hall element. Based on these input signals and a control program prepared in advance, the control device 57 includes a display unit provided on the operation panel 56, a water supply valve 58, a drum motor 16, a pump motor 28 of the circulation pump 26, a drain valve 46, and the like. It has a function to control.

Next, the operation of the above configuration will be described.
When washing, first, the user opens the door 5 and puts laundry (not shown) into the drum 11 from the laundry entrance 4 and also puts a necessary detergent into the water supply case 59, for example, powder detergent. To do. Then, when the operation condition is set by operating the operation unit 55 of the operation panel 56 with the door 5 closed and the operation is started, the control device 57 starts the washing operation based on the control program stored in advance. .

  First, the control device 57 detects the amount (weight) of the laundry stored in the drum 11. For example, the amount of laundry is detected as follows. The drum 11 is rotated by rotating the drum motor 16 in one direction with a predetermined constant power for a predetermined time, the rotation speed is detected by a rotation sensor, and the amount of laundry is determined by the degree of fluctuation of the rotation speed. Are determined in three stages, for example, large capacity, medium capacity, and small capacity. The control device 57 determines the water level according to the amount of the laundry as a high water level, a middle water level, and a low water level as shown in FIG.

  Next, the control device 57 performs water supply for the washing process. In this case, the control device 57 supplies water to the water tank 6 and thus the drum 11 by opening the water supply valve 58 with the drain valve 46 closed. When the water supply valve 58 is opened, as described above, tap water is supplied to the water supply case 59 via the water supply pipe 60, and the water is supplied via the water supply hose 61 together with the detergent put into the water supply case 59. It is supplied into the water tank 6 and eventually into the drum 11. The water level in the water tank 6 is detected by a water level sensor (not shown), and when the set water level is reached, the water supply valve 58 is closed.

  Here, during the water supply in the washing process, specifically, when the water level in the water tank 6 reaches the reset water level (predetermined water level) that is the lowest water level that can be detected by the water level sensor, the control device 57 includes the circulation pump. The drive of the 26 pump motors 28 is started. As a result, the impeller in the pump unit 27 rotates, and as described above, the water in the water tank 6 is sucked into the pump unit 27 through the drain pipe 20 and the filter case 22 by the pump action by the rotation of the impeller. The water in the pump unit 27 is discharged from the discharge port 27 a to the circulation pipe 29 side, passes through the water discharge port 40 of the circulation pipe 29, the joint 30, the connection port unit 31, and the water discharge port body 32, and opens the tip. The part 40c is discharged into the drum 11 and eventually into the water tank 6, whereby the water in the water tank 6 is circulated through the circulation water channel 48 (see arrow A in FIGS. 1 and 2). Two types of circulation operation are prepared as the circulation operation of the water in the water tank 6.

  First, as shown in FIG. 4, the first circulation operation is an operation that performs drive control so as to change the rotational speed of the pump motor 28 of the circulation pump 26, that is, a flexible shower operation. In this flexible shower operation, the rotational speed of the pump motor 28 is increased from 0 to, for example, 5700 rpm, then decreased from 5700 rpm to a speed close to 0, and then increased from a speed close to 0 to 5700 rpm. Then, the speed is decreased from 5700 rpm to a speed close to 0, and then the rotational speed is increased and decreased repeatedly, for example, approximately every 4 seconds. Note that the discharge amount of the circulation pump 26 when the rotational speed of the pump motor 28 is 5700 rpm is 12 L / min as shown in FIG. By the flexible shower operation, the water discharged from the water discharge port 40 is changed and sprinkled so as to diffuse sequentially from the front side in the drum 11 toward the rear as shown by a two-dot chain line in FIG. (The diffusion range at this time is indicated by K2), so that the laundry in the drum 11 is evenly applied.

  The second circulation operation is a circulation operation in which the rotation speed of the pump motor 28 is fixed at, for example, 4600 rpm, that is, a fixed shower operation. In addition, when the rotational speed of the pump motor 28 is 4600 rpm, the discharge amount of the circulation pump 26 is 11 L / min as shown in FIG. By the fixed shower operation, the water discharged from the water discharge port 40 is sprinkled so as to diffuse toward the rear part in the drum 11 as shown by a one-dot chain line in FIG. (The diffusion range at this time is indicated by K1) and is applied to the laundry in the drum 11.

  Now, the control device 57 determines which one of the two circulation operations is selected and executed according to the water pressure at the time of water supply, that is, whether or not to execute the flexible shower operation. Specifically, as shown in FIG. 6, the time ts from the start of water supply until reaching the reset water level is measured, and when this measured time ts is, for example, 20 seconds or less (that is, when the water pressure is sufficiently large). ) Select and execute flexible shower operation. On the other hand, when the time ts is longer than 20 seconds (that is, when the water pressure is low), the flexible shower operation is not selected, and the fixed shower operation in which the rotation speed of the pump motor 28 is fixed at 4600 rpm is selected and executed. To do.

  Here, the reason for selecting the fixed shower operation in which the rotation speed is fixed at 4600 rpm when the water pressure is low will be described. When the water pressure is low, the ability to supply water into the aquarium 6 is low. Therefore, when the circulation pump 26 is driven, water is absorbed by the laundry and the water level in the aquarium 6 is lowered or the rise in the lowered water level is delayed. A phenomenon may occur. When the flexible shower operation is executed in such a low water pressure state, there is a problem that the air pumping noise of the circulation pump 26 is generated when the rotational speed is higher than that in the fixed shower operation. On the other hand, if a fixed shower operation with the rotation speed fixed at 4600 rpm is performed in a state where the water pressure is low, the rotation does not increase excessively, so that the generation of air stagnant noise in the circulation pump 26 is prevented (avoidance). )can do.

  Next, when the water supply to the set water level is completed, the control device 57 executes a washing operation (washing process). In this case, the drum 11 is alternately rotated by the drum motor 16 in both forward and reverse directions at a rotational speed of, for example, 50 to 60 rpm. Thereby, the laundry in the drum 11 is repeatedly swung up by the baffle 13 and dropped, and the laundry is washed.

  And also in this washing process, the control apparatus 57 performs the flexible shower operation or fixed shower operation determined by the water pressure at the time of water supply by drivingly controlling the pump motor 28 of the circulation pump 26 with rotation of the drum 11. . By executing this shower operation, water is evenly applied to the laundry in the drum 11 and the washing effect can be improved. In particular, when the flexible shower operation is executed, water can be evenly applied to the laundry in the drum 11 and the washing effect can be further improved.

  Thereafter, when the set time of the washing process has elapsed, the control device 57 stops the rotation of the drum 11 and also stops the operation of the circulation pump 26. Then, by opening the drain valve 46, the water in the water tank 6 is discharged (and dehydrated) out of the machine. When drainage is completed, the water supply valve 58 is opened while the drain valve 46 is closed, whereby tap water is supplied into the water tank 6 and stored up to the set water level, and a rinsing operation (rinsing process) is performed.

  In this rinsing process, the control device 57 performs the flexible shower operation or the fixed shower operation by alternately rotating the drum 11 in both forward and reverse directions at a rotational speed of 50 to 60 rpm by the drum motor 16 as in the washing process. . The rinsing process is executed a set number of times. After the rinsing process is completed, the dehydration process is performed after draining.

According to the above-described embodiment, the following operational effects can be obtained.
A pump motor 28 capable of controlling the rotational speed is used as a drive source of the circulation pump 26, and the amount of water discharged from the water discharge port 40 is changed by changing the rotational speed of the pump motor 28 during or during the washing process. Since the flexible shower operation is performed to change the momentum of water discharged from the water discharge port 40, the entire laundry in the drum 11 (ie, in front of the drum 11) can be changed as much as possible. Laundry from the side to the back) can be applied evenly. As a result, the detergent liquid can be uniformly permeated into the entire laundry, and the washing efficiency can be further improved.

  Moreover, in the said embodiment, since it comprised so that the pump motor 28 might be operated from the time of reaching predetermined water level (reset water level) from the start of water supply, generation | occurrence | production of the air squeak noise of the circulation pump 26 is prevented reliably. Can do.

  Furthermore, in the above embodiment, since it is configured to determine whether or not to perform the flexible shower operation based on the detection result of the water pressure of the water source during the water supply, when the water pressure is low, the fixed shower operation is performed instead of the flexible shower operation. This can be performed, and the generation of air stagnant noise of the circulation pump 26 can be prevented as much as possible.

(Second Embodiment)
FIG. 7 shows a second embodiment of the present invention. This second embodiment is different from the first embodiment in the following points. In the second embodiment, the control device 57 determines the rotation speed of the pump motor 28 based on the detection result of the water pressure of the water source during the water supply, and determines the operation time of the pump motor 28 based on the detection result of the water pressure. Configured to do.

  Specifically, as shown in FIG. 7, when the time ts until reaching the reset water level exceeds 20 seconds (when the water pressure determination result is less than 5 L / min and the water pressure is low), the pump motor 28 The operation time is set to 30 seconds, the fixed shower operation is executed, and the rotational speed of the pump motor 28 is set to be fixed at 4600 rpm.

  When the time ts is 20 seconds or less and exceeds 10 seconds (when the water pressure determination result is 5 L / min or more and less than 10 L / min and the water pressure is medium), the operation time of the pump motor 28 is set to 15 times. Second, the flexible shower operation is executed, and the rotational speed of the pump motor 28 is set to be variable from 0 to 5700 rpm. When the time ts is 10 seconds or less and exceeds 5 seconds (when the water pressure determination result is 10 L / min or more and less than 15 L / min and the water pressure is high), the operation time of the pump motor 28 is set to 5 seconds. The flexible shower operation is executed, and the rotation speed of the pump motor 28 is set to be variable from 0 to 5700 rpm. When the time ts is 5 seconds or less, the setting is the same as when the time ts is 10 seconds or less and exceeds 5 seconds.

  Since the configuration of the second embodiment other than that described above is substantially the same as the configuration of the first embodiment, the second embodiment also obtains substantially the same operational effects as the first embodiment. be able to. In particular, according to the second embodiment, since the rotational speed and operating time of the pump motor 28 are determined based on the detection result of the water pressure of the water source, when the water pressure is low and the water level is expected to drop. Even in this case, it is possible to prevent the occurrence of the noise of the circulating pump 26.

(Third embodiment)
FIG. 8 shows a third embodiment of the present invention. This third embodiment is different from the first embodiment in the following points. In the third embodiment, the control device 57 determines the rotational speed of the pump motor 28 (that is, either the flexible shower operation or the fixed shower operation) based on the detection result of the weight of the laundry put into the drum 11. In addition to the determination, the operation time of the pump motor 28 is determined based on the result of detecting the weight of the laundry.

  Specifically, as shown in FIG. 8, when the set water level based on the detection result of the weight of the laundry is “high water level”, if the time ts from the start of water supply to the reset water level is within 20 seconds, If the flexible shower operation is performed during the water supply after the reset water level and the time ts exceeds 20 seconds, the fixed shower operation is performed during the same water supply. In the washing process, the fixed shower operation is performed regardless of the time ts. Execute. Further, when the set water level based on the detection result of the weight of the laundry is “medium water level”, if the time ts is within 20 seconds, the flexible shower operation is performed during the water supply after the reset water level, and the time ts is If it exceeds 20 seconds, the fixed shower operation is executed during the same water supply, and the flexible shower operation is executed in the washing process regardless of the time ts.

  Further, when the set water level based on the detection result of the weight of the laundry is “low water level”, if the time ts is within 20 seconds, the flexible shower operation is performed during the water supply after the reset water level, and the time ts is If it exceeds 20 seconds, the fixed shower operation is executed during the same water supply, and the flexible shower operation is executed in the washing process regardless of the time ts.

  Since the configuration of the third embodiment other than that described above is substantially the same as the configuration of the first embodiment, the third embodiment also obtains substantially the same operational effects as the first embodiment. be able to. In particular, when the water level determined according to the weight of the laundry is “medium water level” or “low water level”, the position of the laundry tends to be on the back side of the drum 11 because the drum 11 is inclined. According to the third embodiment, when the set water level based on the weight of the laundry is “medium water level” or “low water level”, the flexible shower operation is executed in the washing process. The washing liquid can be sufficiently applied to the laundry, and the penetration can be increased. On the other hand, when the set water level based on the weight of the laundry is “high water level”, the laundry occupies the inside of the drum. Since the laundry absorbs a large amount of water and air easily flows, the fixed shower operation can be performed to prevent the air pumping noise of the circulation pump 26 from being generated.

1 is a longitudinal side view of a washing machine showing a first embodiment of the present invention. Broken perspective view of washing machine The figure which shows the diffusion range of the water discharged from a water discharge port The figure which shows the change of the rotational speed of the pump motor in flexible shower operation The figure which shows the relationship between the rotational speed of the pump motor and the discharge amount of the circulation pump Diagram showing the relationship between water supply time and water level The figure which shows the 2nd Embodiment of this invention and shows the relationship between the hydraulic pressure detection result, the rotational speed of a pump motor, and the operating time of a pump motor in a table | surface. The figure which shows the 3rd Embodiment of this invention and shows the relationship between the weight detection result of a laundry, the rotational speed of a pump motor, and the operating time of a pump motor in a table | surface.

Explanation of symbols

  In the drawings, 1 is an outer box, 4 is a laundry doorway, 6 is a water tank, 7 is an elastic support mechanism, 8 is a water tank cover, 9 is an opening, 10 is a bellows, 11 is a drum (rotary tank), and 16 is a drum. Motor, 25 is a circulation pump unit, 26 is a circulation pump, 27 is a pump unit, 28 is a pump motor, 29 is a circulation pipe, 32 is a water discharge port body, 36 is an interior lamp, 40 is a water discharge port, 46 Is a drain valve, 47 is a drain hose, 48 is a circulating water channel, 49 is a circulating watering device, 55 is an operation unit, 56 is an operation panel, 57 is a control device (control means), 58 is a water supply valve, 59 is a water supply case, 60 Is a water supply pipe, 61 is a water supply hose, and 62 is a water supply port.

Claims (5)

A water tank capable of storing water and having a water outlet at the bottom;
A rotating tub that has a hole through which water can pass and is rotatably disposed in the water tub, in which laundry is accommodated and rotated by driving means;
A water outlet provided so as to face the inside of the rotary tank;
A circulating water channel having one end connected to the water outlet and the other end connected to the water outlet;
A circulation pump that is provided in the middle of the circulation channel, sucks the water in the water tank through the water discharge port, and discharges the sucked water from the water discharge port into the rotary tank;
In a washing machine provided with a control means for controlling the circulation pump,
The circulation pump uses a pump motor capable of controlling the rotation speed as a drive source,
The control means is configured to execute a flexible shower operation in which the amount of water discharged from the water discharge port is varied by changing the rotation speed of the pump motor during or during the water supply of the washing stroke. With
The control means is configured to operate the pump motor when reaching a predetermined water level from the start of water supply,
The washing machine is characterized in that the control means is configured to determine whether or not to execute the flexible shower operation based on a detection result of water pressure during water supply.   The washing machine according to claim 1, wherein the control means is configured to determine a rotation speed of the pump motor based on a detection result of water pressure during water supply.   The washing machine according to claim 1 or 2, wherein the control means is configured to determine an operation time of the pump motor based on a detection result of water pressure during water supply.   2. The washing machine according to claim 1, wherein the control means is configured to determine a rotation speed of the pump motor based on a detection result of a weight of the laundry put into the rotating tub. .   The said control means is comprised so that the operating time of the said pump motor may be determined based on the detection result of the weight of the laundry thrown into the said rotary tub. Washing machine.

Images