JP2016172053A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of acquiring a sufficient effect of beat washing of laundry, and capable of performing washing and rinsing efficiently.SOLUTION: A drum type washing machine includes: a bottomed cylindrical water tub which is elastically supported so that a central axis is located on an axis line descending backward, and in which the back side is blocked; a bottomed cylindrical drum which is located so as to be rotatable around the axis line in the water tub, and in which the back side is blocked; a washing machine motor provided outside the water tub and for driving the drum; a water discharge mechanism part for sprinkling water inside the drum; a drainage port part formed at a bottom part on the back side of the water tub; a circulation path formed so as to connect the drainage port part and the water discharge mechanism part; and a circulation pump which discharges the water taken-in from the drainage port part toward the drum from the water discharge mechanism part. The water discharge mechanism part has a water passage formed by an inner wall of the water tub and a blocking plate mounted on the water tub.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drum-type washing machine having a circulation path for circulating washing water in a water tank.

  In general, a drum-type washing machine includes a bottomed cylindrical water tank whose back side is closed. The water tank is elastically supported in the outer box so that the central axis is positioned on an axis that descends rearward. A drum that is driven to rotate by a washing machine motor is rotatably provided in the water tank. A plurality of baffles for scraping the laundry are provided on the inner periphery of the drum. For example, the baffle is configured to extend straight in the front-rear direction of the water tank. At the time of washing operation, washing water in which detergent is dissolved is stored in the aquarium, and the drum is rotated, and the clothes that are the laundry containing the washing water are scraped and dropped by the baffle to wash the clothes. Is done.

  In the drum type washing machine having such a baffle, it is important that the washing water in which the detergent is dissolved is sufficiently permeated before dropping from the baffle. For this reason, conventionally, a circulation path having a circulation pump that takes out the washing water from the bottom of the aquarium and discharges it into the drum from the top of the aquarium is provided, in addition to the natural penetration of the washing water when the clothing is at the bottom of the drum, A configuration is conceived in which forced permeation is performed by sprinkling washing water into the drum through a circulation path (see, for example, Patent Document 1).

JP 2008-113982 A

  In the conventional configuration, the aquarium is elastically supported in the outer box so that the central axis is positioned on the axis descending rearward, so that the washing water easily collects in the corner on the back side of the aquarium, There is an advantage that the water level can be raised with a small amount of washing water. However, since the drum is provided in the water tank so as to be rotatable around its axis, the baffle is also inclined downward toward the back side, and the clothes scraped up with the rotation of the drum are moved to the back side. The garment tends to be unevenly distributed on the back side in the drum. Therefore, as in the prior art, it has been difficult to uniformly infiltrate the washing water into the entire garment simply by spraying the washing water from the upper part of the water tank into the drum through the circulation path. Thereby, the washing effect of the laundry may not be sufficiently obtained, and the washing efficiency is deteriorated. This is a problem that also occurs during rinsing.

  The present invention has been made in view of the above circumstances, and the object thereof is to allow the washing water to penetrate evenly into the entire laundry by the circulation path, and to obtain a sufficient tapping wash effect on the laundry. It is possible to provide a drum type washing machine that can perform washing and rinsing efficiently.

  The drum type washing machine according to the embodiment is elastically supported so that the central axis is positioned on an axis that descends rearward, and has a cylindrical water tank with a bottom closed on the back side, and the axis line in the water tank. A bottomed cylindrical drum that is rotatably provided at the center and closed on the back side, a washing machine motor that is provided outside the water tank and drives the drum, and a water discharge mechanism that sprays water inside the drum. The drain port formed at the bottom on the back side of the aquarium, the circulation path formed so as to connect the drain port and the water discharge mechanism, and the water taken from the drain port A circulation pump that discharges from the water discharge mechanism into the drum. The water discharge mechanism has a water channel formed by an inner wall of the water tank and a blocking plate attached to the water tank.

1 is a longitudinal side view of an entire drum type washing machine showing a first embodiment of the present invention. Broken perspective view of the entire drum type washing machine Development plan view of a part of the drum Rear view of tank cover part Sectional view along line 5-5 in FIG. Sectional view along 6-6 in FIG. Sectional view along 7-7 in FIG. Sectional view along 8-8 in FIG. E arrow view of FIG. F arrow view of FIG. Block diagram showing electrical configuration Rear view schematically showing the drum for operation explanation Side view schematically showing the drum for explaining the operation Time chart for action explanation (Part 1) Time chart for action explanation (Part 2) Time chart for action explanation (Part 3) Flow chart for action description The figure which shows the relationship between the quantity of clothes and the washing water penetration rate Current characteristics of pump motor Flowchart showing a second embodiment of the present invention Time chart showing a third embodiment of the present invention

A first embodiment of the present invention will be described below with reference to FIGS.
First, FIG. 1 and FIG. 2 show the overall structure of a drum type washing machine. Specifically, the outer box 1 of the drum type washing machine includes a base 1A made of synthetic resin and a box body 1B coupled to the base 1A. A laundry entrance / exit portion 2 is formed at a substantially central portion of the front surface (left side in FIG. 1) of the box body 1B, and a door 3 having a double glass structure for opening and closing the laundry entrance / exit 2 is provided. . In addition, an operation panel 4 is provided at the upper part of the front surface of the box body 1B, and a control device 5 as control means is provided on the back side (inside the outer box 1).

  Inside the outer box 1, a bottomed cylindrical water tank 6 whose back side is closed is provided. The water tank 6 is elastically supported by the suspension 7 in the outer box 1 so that the central axis is positioned on an axis that descends rearward (right side in FIG. 1).

  A washing machine motor 8 is provided outside the rear side of the water tank 6. The washing machine motor 8 is composed of, for example, a direct current brushless motor, is an outer rotor type, and includes a stator 8A and a rotor 8B. The stator 8A is attached to the outside on the back side of the water tank 6, and the rotating shaft 8C at the center of the rotor 8B is supported by the bearing bracket 9 via the bearing 10 and inserted into the water tank 6.

  In the water tank 6, a bottomed cylindrical drum 11 whose back side is closed is provided. The drum 11 has a central portion on the outer side on the back side connected to the tip of the rotating shaft 8C of the washing machine motor 8 and is rotatably provided about the axis of the water tub 6. The drum 11 is driven forward and backward by the washing machine motor 8. The In this case, the washing machine motor 8 functions as a drive device that rotates the drum 11.

  A large number of holes 12 are formed in the peripheral wall (body portion) of the drum 11 over the entire area. In this case, the hole 12 is formed in a front half (front half) of the front and rear centers of the drum 11, that is, in a region ahead of the front and rear centers of the drum 11 (shown as a hole 12 </ b> A in the drawing). The number is larger than the number of rear half portions (second half portion) from the center of the drum, that is, the number formed in the region behind the front and rear centers of the drum 11 (shown as holes 12B in the drawing). Is set. Also, a plurality of baffles 13 for picking up laundry are provided at equal intervals on the inner peripheral portion of the drum 11. The baffle 13 will be described in detail later.

  Both the drum 11 and the water tank 6 are open on the front side. For example, a liquid-sealed rotary balancer 15 is provided inside the periphery of the opening 14 on the front side of the drum 11. A water tank cover 16 is attached to the opening on the front side of the water tank 6, and the opening 16 a at the tip is connected to the laundry entrance / exit 2 by a bellows 17 made of an annular elastic material, for example, rubber. . As a result, the laundry entrance / exit 2 is connected to the inside of the drum 11 through the bellows 17, the water tank cover 16, and the opening 14 of the drum 11.

  A drain port 18 that also serves as a water intake port is formed at the bottom of the rear side of the water tank 6. One end of an in-machine drain hose 19 is connected to the drain port 18. The other end of the in-machine drain hose 19 is connected to the in-machine drain hose connection port 21 of the filter case 20 provided in the front part of the base 1 </ b> A of the outer box 1.

  The filter case 20 has an in-machine drain hose connection port portion 21 formed in the upper portion and a cap 22 attached to the front end portion. The filter case 20 houses therein a lint filter (not shown) integrated with the cap 22. A drain valve 23 is connected to the lower part of the filter case 20, and a drain pipe 24 is connected to the outlet of the drain valve 23. The distal end portion of the drainage pipe 24 faces the outside of the machine from the base 1A of the outer box 1 and is connected to an outside drainage hose (not shown).

  On the other hand, a circulation pump 25 is provided at the rear end of the filter case 20. The circulation pump 25 sucks water in the water tank 6 (drum 11) through the drain port 18, the in-machine drain hose 19, and the filter case 20. In the circulation pump 25 (pump motor 25a is shown in FIG. 11), a discharge port portion 26 is formed in a peripheral side portion (upper portion in the figure), and one end portion of a water supply hose 27 is connected to the discharge port portion 26. The intermediate portion of the water supply hose 27 extends upward from the circumferential side of the water tank cover 16, and the tip portion is connected to a water discharge mechanism portion 28 formed on the water tank cover 16. As will be described later, the water discharge mechanism section 28 is configured to spray water inside the drum 11. As a result, the circulation path 30 is formed so as to connect the drain port 18 and the water discharge mechanism 28. That is, the circulation path 30 is formed by the water tank 6, the drum 11, the drain port 18, the in-machine drain hose 19, the filter case 20, the water supply hose 27, and the water discharge mechanism 28, and the circulation pump 25 is located in the circulation path 30. It is provided as follows. The circulation pump 25 discharges water taken out from the drain port 18 of the water tank 6 from the water discharge mechanism 28 into the drum 11 in a shower shape.

  An air trap 31 is provided in the upper part of the front portion of the filter case 20. The air trap 31 and the water level sensor 32 disposed at the top of the outer box 1 are connected by an air tube 33. As a result, the water level sensor 32 detects the water level in the water tank 6 via the in-machine drain hose 19, the filter case 20, the air trap 31, and the air tube 33, and functions as a water level detecting means. It has become.

  A water supply valve 34 and a water supply case 35 are provided at the top of the outer box 1. The water supply valve 34 is connected to an inlet water supply hose (not shown) connected to a faucet (not shown) at the inlet, and one end of a connection pipe 36 is connected to the outlet. The other end of the connection pipe 36 is connected to the water supply case 35. The water supply case 35 has a detergent storage part (not shown) inside. One end of an in-machine water supply hose 37 is connected to the water supply case 35, and the other end of the in-machine water supply hose 37 is connected to the upper part of the water tank 6. As a result, the water supplied from the water supply via the water supply valve 34 is supplied into the water tank 6 via the connection pipe 36, the detergent storage part of the water supply case 35, and the in-machine water supply hose 37. Further, the water supply valve 34 and the water supply case 35 constitute a normal water supply device 38 for supplying water into the water tank 6.

  As shown in FIGS. 1 to 3, the baffle 13 described above extends in the front-rear direction along the axis of the water tank 6 and protrudes toward the rotation center axis side of the drum 11. The baffle 13 has a mountain shape in which both side surfaces 13A and 13B in the circumferential direction rise toward the central ridge 13C. A plurality of holes 13D are formed in the central ridge portion 13C. In this embodiment, the side surface portion 13A is a side surface portion in the clockwise direction (for example, the direction of arrow A in FIGS. 2 and 3) when the drum type washing machine is viewed from the front, and the side surface portion 13B is a drum type. The washing machine is a side portion on the counterclockwise direction side (for example, the arrow B direction in FIGS. 2 and 3) when viewed from the front.

  The central ridge 13C of the baffle 13 is curved like a sine wave when viewed from the plane direction, as shown in FIGS. Specifically, the central ridge 13C is divided from the first ridge 13Ca, the second ridge 13Cb, and the third ridge 13Cc when the region is divided into three so as to be aligned in the longitudinal direction. It is configured. The first protrusion 13Ca is located on one side in the circumferential direction with respect to the line L (see FIG. 3) along the axis of the water tub 6 (for example, the arrow A direction side when the drum type washing machine is viewed from the front). And it is located on the front side of the drum 11. The second protrusion 13Cb is located on the other side in the circumferential direction with respect to the line L along the axis (for example, the arrow B direction side when the drum type washing machine is viewed from the front) and located on the back side of the drum 11. doing. The third protrusion 13Cc is located between the first protrusion 13Ca and the second protrusion 13Cc. Further, the first protrusion 13Ca and the third protrusion 13Cc are connected by a smooth curve, and the second protrusion 13Cb and the third protrusion 13Cc are connected by a smooth curve. And the 1st recessed part 13E is formed by the 1st protrusion part 13Ca and the 3rd protrusion part 13Cc, and the 1st recessed part 13E is formed by the 2nd protrusion part 13Cb and the 3rd protrusion part 13Cc. A second concave portion 13F is formed in the opposite direction.

  As shown in FIG. 1, an air trap 39 communicating with the inside of the water tank 6 is provided at the upper part on the back side of the water tank 6. The air trap 39 and the foam sensor 40 disposed at the top of the outer box 1 are connected by an air tube 41. The bubble sensor 40 is composed of a pressure switch. When bubbles are generated in the water tank 6 and reach the air trap 39, the pressure in the air trap 39 changes due to expansion and contraction of the bubbles as the drum 11 rotates. Therefore, the amount of bubbles generated is detected by detecting the pressure change.

Next, the water discharge mechanism 28 will be described with reference to FIGS.
As shown in FIGS. 1, 4, 5, and 6, the water discharge mechanism 28 includes protrusions 42 and 42 that are integrally formed on the substantially upper outer periphery of the inner surface of the water tank cover 16, and these protrusions. 42 and 42, a closing plate 44 that is attached (welded) to the tip of the water 42 to form a water channel 43. A connecting port portion 45 (see FIG. 5) communicating with the water channel 43 is formed on the left side portion (right side portion in FIG. 4) of the water tank cover 16 in FIG. It is connected. A first water outlet 46 (see FIG. 7) is formed together with the closing plate 44 at a portion located above the connection port 45 of the water tank cover 16, and the first water outlet 46 is the drum 11. It has a diffusion plate portion 46a facing inward. In the part (the right part in FIG. 2 and the left part in FIG. 4) located on the opposite side of the first water outlet part 46 of the water tank cover 16, the second water outlet part 47 together with the blocking plate 44 is provided. (Refer FIG. 8) is formed, and the 2nd water discharge port part 47 has the diffusion plate part 47a which faces in the drum 11. As shown in FIG. In this case, the first water outlet 46 and the second water outlet 47 are, as shown in FIGS. 12 and 13, the water falling point of the second water discharge path Pa by the first water outlet 46, The water falling point of the water discharge path Pb by the second water discharge port portion 47 is set to be on the back side of the water discharge point of the first water discharge port portion 46 on the front side in the drum 11. As shown in FIGS. 9 and 10, the first water discharge port portion 46 and the second water discharge port portion 47 are arranged in the direction of the opening of the second water discharge port portion 47 from the opening of the first water discharge port portion 46. The discharge flow rate of the second water discharge port 47 is set to be larger than the discharge flow rate of the first water discharge port 46. As shown in FIG. 8, the second water outlet 47 is formed with a water passage hole 47 b for injecting washing water to the rear glass 3 a of the door 3. Bubbles adhering to the rear glass 3a of the door 3 are washed away by water jetted from the water passage hole 47b of the second water outlet 47.

  FIG. 11 shows an electrical configuration of the drum type washing machine. The control device 5 is composed mainly of a microcomputer and controls the overall operation of the drum type washing machine. The control device 5 includes various operation signals from an operation unit 48 including various keys (switches) provided on the operation panel 4 (see FIG. 1), a water level detection signal from the water level sensor 32, and a bubble sensor 40. A foam detection signal, a speed detection signal from a rotation sensor that detects the rotation speed of the washing machine motor 8, a speed detection signal from the rotation sensor 50 that detects the rotation speed of the pump motor 25a, and a current transformer that detects the current of the pump motor 25a A current detection signal from 51 is input.

  And the control apparatus 5 controls the water supply valve 34, the drain valve 23, the washing machine motor 8, and the pump motor 25a based on the said various input signals and the control program memorize | stored previously. In this case, the control device 5 controls the rotational speed of the washing machine motor 8 by a pulse width modulation (PWM) method using an inverter. In addition to the amount of detergent used according to the laundry weight detection described below, the control device 5 displays the set operation course and the rest of the operation on the display unit 52 provided on the operation panel 4 such as a liquid crystal panel. Various information such as time, reservation time, and current time is displayed.

Next, the operation of the above configuration will be described with reference to the time charts of FIGS. 14 to 16 and the flowchart of FIG.
In this embodiment, for example, the user operates the operation panel 4 to select a normal driving course (course for performing each process of washing, rinsing, and dehydration), and operates the start key of the operation unit 48 of the operation panel 4. Then, the control device 5 starts (starts) the operation of the selected operation. Based on the signal output from the operation unit 48, the control device 5 first detects the weight of the laundry (clothing) (processing step S1 in FIG. 17). The weight of the laundry is detected by rotating the drum 11 to a predetermined rotational speed, and the time required for the rotation, and then stopping the driving of the drum 11 by the washing machine motor 8 to rotate the drum 11 by inertia, thereby causing the drum 11 to rotate. Is calculated from the time required for the rotation speed to drop to a predetermined rotation speed, and the weight of the laundry is detected by the rotational load of the washing machine motor 8. Thereafter, determination of the amount of detergent, determination of the water level in the washing process and determination of the rotational speed of the drum 11 are performed from the result of detection of the laundry weight. In this case, the rotation sensor 49 that detects the rotation speed of the washing machine motor 8 serves as a weight detection unit that detects the weight of the laundry in the drum 11. And the control apparatus 5 displays on the display part 52 the detergent amount of the determination result of a detergent amount (process step S2 of FIG. 17).

  The control device 5 detects the weight (load amount) of the laundry in three stages of small (for example, 1 kg), medium (for example, 3 kg), and large (for example, 6 kg), and in accordance with this, FIG. The time charts of FIGS. 15 and 16 are selected.

  The control device 5 waits for a predetermined time (for example, 20 s (seconds)) for the user to input the amount of detergent displayed on the water supply case 35 based on the detergent amount display by the display unit 52 (judgment step S3 in FIG. 17). ) After a predetermined time has elapsed, the water supply valve 34 is opened, and tap water is supplied to the water level determined for the washing process (the water level at which the laundry is immersed). In this case, it is assumed that an amount of detergent corresponding to the determination of the amount of detergent by the control device 5 is input in the detergent storage portion of the water supply case 35 in advance. Here, since the drum 11 is provided so as to be rotatable around the axis of the water tank 6 whose central axis descends rearward, the water supplied is the back side (second half part) of the drum 11 (water tank 6). ) And becomes shallower toward the front side (front half side) of the drum 11, and there is little or no water near the front side (front end side) of the drum 11.

  The controller 5 supplies the washing machine motor 8 with a low speed (for example, 40 to 60 rpm) forward rotation 15 s (seconds), a stop 1 s, a low speed (for example 40 to 60 rpm) reverse rotation 15 s, and a stop 1 s period along with the start of water supply. The drum 11 is driven to rotate (see step S5 in FIG. 17, (c) in FIGS. 14 to 16).

  After that, when the water level detected by the water level sensor 32 reaches a drivable water level for the circulation pump 25 ("YES" in the determination step S6 in FIG. 17), the control device 5 detects whether the bubble sensor 40 has detected a predetermined amount of bubbles. It is judged whether or not, the pump motor 25a is rotated to drive the circulation pump 25 (see FIGS. 14 to 16B). In this case, the control device 5 drives the circulation pump 25 by rotating the pump motor 25a at a set speed (for example, 2000 rpm) when the amount of bubbles detected by the bubble sensor 40 is less than a predetermined amount ("NO" in determination step S7). (Processing step S8). Further, when the amount of bubbles detected by the bubble sensor 40 is equal to or greater than a predetermined amount (“YES” in determination step S7), the control device 5 sequentially changes the pump motor 25a from the current set speed (for example, 2000 rpm) to a constant speed (for example, 100 rpm). The circulating pump 25 is driven by being rotated at a reduced speed (for example, 2000-100 rpm) (processing step S9).

  Further, the control device 5 observes the detected current value of the current transformer 51 and determines whether the circulation pump 25 has air leakage (determination step S10 in FIG. 17). The washing water in which the detergent supplied in the water tank 6, that is, the drum 11 is dissolved, generates foam by being stirred by the laundry washed up by the baffle 13 and circulated by the circulation pump 25. If this is excessive, not only the cleaning effect is lowered, but also the circulation pump 25 is damaged. When excessive bubbles are generated in the water tank 6 and bubbles enter the circulation pump 25, the current value of the pump motor 25a fluctuates greatly as shown in FIG. 19, and then becomes substantially constant at a low value below a predetermined value. As a result, the control device 5 determines whether or not air is generated in the circulation pump 25 (determination step S10 in FIG. 17).

  When the control device 5 determines that air is trapped in the circulation pump 25 (“YES” in determination step S10), the control device 5 changes the set speed of the pump motor 25a from the current set speed to a constant speed (step S11). For example, the speed is reduced to 100 rpm (processing step S11 in FIG. 17), and the process proceeds to the next determination step S12. Note that when the control device 5 determines that air is not generated in the circulation pump 25 (“NO” in determination step S10), the control device 5 proceeds directly to determination step S12.

  In the determination step S12, the control device 5 determines whether or not the water level sensor 32 has reached the predetermined washing water level set in the processing step S1, and if not (“NO” in the determination step S12), the determination step Returning to S7, if it has been reached ("YES" in judgment step S12), water supply by the water supply valve 34 is stopped (processing step S13). Thereafter, the control device 5 performs substantial washing (processing step S14).

  In the initial stage of the washing process, the control device 5 causes the drum 11 to rotate forward at a low speed (for example, 40 to 60 rpm) for a time corresponding to the weight of the laundry. That is, when the weight of the laundry is small (for example, 1 kg), the control device 5 rotates the washing machine motor 8 forward for 20 s (seconds) (see FIG. 14C), and the weight of the laundry is medium ( For example, in the case of 3 kg), the washing machine motor 8 is rotated forward for 30 s (seconds) (see FIG. 15C), and when the weight of the laundry is large (for example, 6 kg), the washing machine motor 8 is turned on for 40 s. (Seconds) Forward rotation (see FIG. 16C). That is, in the initial stage of the washing process, the control device 5 selects the rotation direction of the drum 11 as the normal rotation direction, and changes the normal rotation time of the washing machine motor 8 according to the weight of the laundry, thereby changing the drum 11. The amount of rotation is changed.

  As a result, tapping washing in which the laundry previously stored in the drum 11 is scraped up and dropped by the baffle 13 is repeatedly performed. Further, as described above, the control device 5 drives the circulation pump 25 during the washing process so that the water in the water tank 6 taken from the drain port 18 of the water tank 6 is supplied to the upper part of the opening of the water tank 6. The water is supplied in a shower form from the first water outlet 46 and the second water outlet 47 of the water discharge mechanism 28 toward the front side and the back side of the drum 11.

  Thereafter, the control device 5 executes determination step S15, processing step S16, determination step S17, and processing step S18 similar to the above-described determination step S7, processing step S9, determination step S10, and processing step S11. Thereafter, the control device 5 causes the washing machine motor 8 to perform a normal operation in which 30s forward rotation, 1s stop, 30s reverse rotation, and 1s stop are repeated (processing step S19).

  Then, the control device 5 determines whether or not the washing set time has elapsed, and when it has not elapsed (“NO” in determination step S20), the control device 5 returns to determination step S15, and when it has elapsed (in determination step S20 “ YES ”), the drain valve 23 is opened, and the water in the aquarium 6 (drum 11) is drained from the drain port 18 of the aquarium 6 to the in-machine drain hose 19, filter case 20 (lint filter), drain valve 23, drain pipe. 24 and the drainage hose outside the machine are discharged (processing step S21 in FIG. 17).

  Next, the control apparatus 5 performs a rinse process. In the rinsing process, the control device 5 repeatedly performs water supply, rinsing, and draining similar to the washing process. And the control apparatus 5 performs a dehydration process. In the dehydration process, the control device 5 rotates the drum 11 in one direction at a high speed (for example, 700 to 1500 rpm) to perform centrifugal dehydration on the laundry. When the dehydration process ends, the normal driving course (washing operation) ends.

  12 and 13 show the state of the clothes W as the laundry at the initial stage of the washing process of the washing operation. When the drum 11 rotates in the direction of arrow A (forward rotation), the garment W moves from the front side to the rear side (arrow Y direction) along the side surface portion 13A of the baffle 13 while being scraped up by the baffle 13. In this case, since the second recess 13F is formed on the back side of the baffle 13, the garment W is not moved to the rear end side from the second recess 13F even if the drum 11 rotates. It fits in the 2nd recessed part 13F. Further, since the second recess 13F is on the rear half side of the baffle 13, the clothes W contained in the second recess 13F become near the uppermost position in the drum 11 by the rotation of the drum 11, and the laundry W Falls to the rear half of the drum 11 due to its own weight and is washed. At this time, since a large amount of washing water has accumulated on the rear half side of the drum 11, the water can easily soak into the laundry W. In this case, since the forward rotation amount (rotation time) of the drum 11 increases as the amount (weight) of the garment W increases, the garment W increases as the amount (weight) of the garment W increases. It is moved to the back side and falls to the back side where a lot of washing water is accumulated, so that the detergent is promoted to dissolve in water and the washing water easily penetrates into the clothes W. In addition, the amount of water sprayed by the second water outlet 47 that sprays the back surface of the drum 11 is set larger than the amount of water discharged by the first water outlet 46 that sprays the front surface of the drum 11. Therefore, the washing water can be evenly permeated throughout the clothing W.

  Next, when the drum 11 rotates (reverses) in the direction of arrow B, the garment W moves from the rear side to the front side (in the direction of arrow X) along the side surface portion 13B of the baffle 13 while being scraped up by the baffle 13. In this case, since the first recess 13E is formed on the front half side of the baffle 13, the garment W is not moved to the front end portion than the first recess 13E even if the drum 11 rotates. It fits in the 1st recessed part 13E. Further, since the first recess 13E is on the front half side of the baffle 13, the clothing W contained in the first recess 13E becomes near its uppermost position in the drum 11 due to the rotation of the drum 11, so that the clothing W Thus, the drum 11 falls to the front half side of the drum 11 and is washed. At this time, since there is almost no water in the first half of the drum 11, water is easily pushed out from the laundry W by tapping.

  As described above, according to this embodiment, the water discharge mechanism 28 of the circulation path 30 includes the first water discharge port portion 46 that sprays water on the front side of the drum 11 and the second water discharge port that sprinkles water on the back side in the drum 11. Since the water discharge amount of the second water discharge port portion 47 is set larger than the water discharge amount of the first water discharge port portion 46, the water discharge portion 47 is moved so as to be unevenly distributed on the back side. The washing water can be uniformly permeated throughout the clothes W, and the tapping effect can be sufficiently exerted, so that washing and rinsing can be performed efficiently.

  In addition, at the initial stage of the washing process, since the forward rotation amount (rotation time) of the drum 11 increases as the amount (weight) of the clothing W increases, the clothing W is the amount of the clothing W. As the (weight) increases, the drum 11 moves to the back side and falls to the back side where a large amount of washing water accumulates, and the detergent is promoted to dissolve in water, and the washing water becomes clothing. It becomes easy to penetrate into W. As shown in FIG. 18, the penetration rate of the washing water into the garment W becomes worse as the weight of the garment W increases. Thus, increasing the forward rotation time as the weight of the garment W increases as in the present embodiment is effective in allowing the washing water to penetrate into the garment W.

  Furthermore, when the foam detected by the foam sensor 40 exceeds a predetermined amount, the control device 5 rotates the pump motor 25a at a speed obtained by sequentially subtracting a constant speed from the current set speed to drive the circulation pump 25 (the circulating water amount is reduced). Therefore, it is possible to prevent the foam from being excessively generated in the drum 11 and deteriorating the cleaning effect.

  When the control device 5 observes the detected current value of the current transformer 51 and determines that air is trapped in the circulation pump 25, the control speed of the pump motor 25a is changed from the current set speed to a constant speed. Since the speed is changed to a reduced speed (the amount of circulating water is reduced), the circulating pump 25 can be prevented from being damaged.

  Note that the control device 5 repeatedly executes the processing step S15 or the processing step S17 to stop the pump motor 25a and continue unnecessary control when the rotational speed of the circulation pump 25 falls below the lower limit value. It comes to prevent.

  FIG. 20 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment (FIG. 17) are denoted by the same reference numerals. In the second embodiment, the determination step S10, the processing step S11, the determination step S17, and the processing step S18 related to the current transformer 51 (see FIG. 11) are omitted, and the current transformer 51 is omitted.

  FIG. 21 shows a third embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment (FIGS. 14 to 16). In the third embodiment, the normal rotation times 20 s, 30 s, and 40 s of the drum 11 (see FIGS. 1 and 2) set according to the weight of the laundry in the initial stage of the washing process are set as follows: This is executed by dividing into a plurality of forward rotation times and stop times, and according to this configuration, the generation of bubbles can be suppressed as much as possible.

  As described above, according to the drum washing machine of the embodiment, the water discharge mechanism unit includes the first water discharge port unit and the second water discharge port unit, and the water discharge amount of the second water discharge port unit is set to the first water discharge port unit. Since it is set to be larger than the amount of water discharged, the washing water can be evenly permeated throughout the clothing, and the washing and rinsing effect can be fully exerted so that washing and rinsing can be performed efficiently. Can do.

The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications and expansions are possible.
Instead of the baffle 13 of the above embodiment, a normal linear baffle may be used.

The number of baffles 13 may be other than three.
In the above embodiment, the rotation amount of the drum 11 is changed by changing the normal rotation time of the drum 11 in accordance with the weight of the laundry at the initial stage of the washing process. You may make it change the rotation amount of the drum 11 by changing rolling speed.

  A configuration using a current sensor as the weight detection means is very good. Specifically, the control device 5 drives the washing machine motor 8 to rotate the drum 11, and the drum is based on the magnitude of the current detected by the current sensor at that time and the data recorded in the control device 5 in advance. You may make it judge the weight of the laundry accommodated in 11. FIG.

The present invention can also be applied to a drum-type washing machine with a drying function.
In addition, the present invention can be implemented with appropriate modifications without departing from the scope of the present invention.

  In the drawings, 1 is an outer box, 5 is a control device (control means), 6 is a water tank, 8 is a washing machine motor, 11 is a drum, 13 is a baffle, 18 is a drain port (intake port), and 25 is a circulation pump. 25a is a pump motor, 28 is a water discharge mechanism, 30 is a circulation path, 46 is a first water discharge port, and 47 is a second water discharge port.

Claims (1)

A bottomed cylindrical water tank elastically supported so that the central axis is located on the axis descending rearward and closed on the back side;
A bottomed cylindrical drum provided in the water tank so as to be rotatable around the axis and closed on the back side;
A washing machine motor which is provided outside the water tank and drives the drum;
A water discharge mechanism for spraying water into the drum;
A drain port formed at the bottom on the back side of the water tank;
A circulation path formed so as to connect the drain port and the water discharge mechanism,
A circulation pump that discharges the water taken from the drain port from the water discharge mechanism into the drum,
The water discharge mechanism is a drum-type washing machine having a water channel formed by an inner wall of the water tank and a blocking plate attached to the water tank.

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