JP2015100504A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently and reliably apply heat retained by circulation water to laundry in a drum while inhibiting the absorption of the circulation water into the laundry in the drum.SOLUTION: When determining that a water level in a water receiving tub 7 has reached the upper end of a water storage part 13, a control part 65 closes a water supply valve 27 to stop water supply. The control part 65 drives a motor 29 to rotate a drum 9 normally and reversely while causing a circulation pump 37 to circulate circulation water, at this time the circulation water discharged from a main discharge end part 45 flows down to the upper end part of a side wall part 9c of the drum 9. When flowing down, the circulation water reaches positions which deviate from through-holes 9d, 9d, ... in the outer peripheral surface of the side wall part 9c of the drum 9, so that the circulation water drops along the outer peripheral surface of the side wall part 9c without passing through the through-holes 9d, 9d, ... and being absorbed into laundry in the drum 9.

Description

  The present invention relates to a drum-type washing machine, and more particularly to a technique for increasing the washing effect by applying heat to laundry in a drum using heated water.

  Conventionally, there is a drum type washing machine that supplies heated water to laundry in a drum for the purpose of improving the cleaning effect (see Patent Documents 1 and 2).

  For example, Patent Document 1 includes a drum that can rotate around a substantially horizontal axis, and a water receiving tank that accommodates the drum and has a recess formed in the lower portion thereof, and a heater is disposed in the recess. The circulation pump further includes a circulation pump for sucking water from the inside of the recess and a circulation hose connected to the discharge port side of the circulation pump, and the discharge port of the circulation hose is disposed so as to face the opening of the drum. A drum-type washing machine in which water heated by the heater in the recess is sucked into the circulation pump, discharged from the discharge port toward the center of the drum through the circulation hose, and supplied to the laundry. It is disclosed.

JP 09-215893 A JP 2012-170693 A

  However, in the drum type washing machine of Patent Document 1, since circulating water is supplied into the drum during the washing process, a part of the water is absorbed by the laundry in the drum. Then, when washing with a small amount of water, there is a problem that the circulating water is absorbed by the laundry and the circulating water is deficient, and the expected cleaning effect cannot be obtained. Further, there is a problem that the water level in the water receiving tank is lowered due to the lack of circulating water, and the heater disposed at the lower part of the water receiving tank is exposed.

  In order to solve these problems, the discharge port of the circulation hose is provided below the drum of the water receiving tank, and the circulation water is brought into contact with the outer peripheral surface of the lower drum, thereby preventing the circulation water from being absorbed by the laundry, A countermeasure is conceivable in which the heat retained by the circulating water is indirectly applied to the laundry in the drum via the drum. However, when washing with a small amount of water in a drum-type washing machine with this measure taken, the water level of the circulating water is located below the drum. There is a problem that it is not applied to the laundry in the drum.

  The present invention has been made in view of the above points, and the object of the present invention is to prevent the circulating water from being absorbed by the laundry, while maintaining the heat held by the circulating water in the laundry in the drum. It is to give it sufficiently and reliably.

  In order to achieve the above object, the present invention is to bring heated circulating water into contact with the outer peripheral surface of the drum.

  Specifically, the present invention relates to a water receiving tank capable of storing and draining water, a drum accommodated in the water receiving tank so as to be rotatable about a substantially horizontal axis, and a water supply means for supplying water into the water receiving tank. And a water intake end connected to the lower part of the water receiving tank and a main discharge end facing the water receiving tank, a water passage that sucks water from the water intake end, and pumps the water toward the main discharge end. And a heating means for heating the circulating water discharged from the main discharge end portion into the water receiving tank by the circulation pump, and the circulating water heated by the heating means during the washing process. For the drum type washing machine discharged into the water receiving tank by the circulation pump, the following solution was taken.

  That is, in the first invention, the water supply means supplies water so that the water level in the water receiving tank is equal to or lower than the lower end of the drum during the washing process, and the main discharge end portion supplies the circulating water to the outer periphery of the drum. It discharges so that a surface may be contacted.

  According to the first invention, the main discharge end discharges the heated circulating water so as to contact the outer peripheral surface of the drum. Therefore, even when the water level of the circulating water in the water receiving tank is lower than the lower end of the drum during the washing process and heat is difficult to transfer from the circulating water to the drum, the circulating water reliably contacts the drum. The heat stored in the circulating water is reliably transmitted to the laundry inside through the drum.

  Moreover, according to 1st invention, the main discharge end part has made circulating water contact the drum outer peripheral surface. That is, since the main discharge end makes the circulating water contact from the outside of the drum, the circulating water can be prevented from entering the drum. Therefore, it can suppress that circulating water is absorbed by the laundry in a drum.

  As mentioned above, according to 1st invention, the heat | fever which circulating water holds can be fully and reliably provided to the laundry in a drum, suppressing the absorption of the circulating water to the laundry in a drum. .

  According to a second aspect, in the first aspect, the main discharge end is provided above the lower end of the drum.

  According to the second aspect, since the main discharge end is provided above the lower end of the drum, the circulating water discharged from the main discharge end can be reliably brought into contact with the outer peripheral surface of the drum.

  According to the second invention, the circulating water can be brought into contact with the outer peripheral surface of the drum with a simple configuration in which the main discharge end is provided above the lower end of the drum.

  According to a third invention, in the first or second invention, the water supply means is provided above the drum in the water receiving tank, has a water supply port for supplying water into the drum, and the main discharge end portion. Is connected to the water supply port.

  According to the third invention, the circulating water can be reliably brought into contact with the outer peripheral surface of the drum using the water supply port.

  According to a fourth invention, in the first invention, the main discharge end portion faces the water receiving tank at a position lower than the water level in the water receiving tank and jets the circulating water upward. Means are provided.

  According to 4th invention, circulating water can be made to contact the lower outer peripheral surface of a drum by injecting circulating water from the drum downward direction by an injection means.

  According to a fifth invention, in any one of the first to fourth inventions, the drum has a bottomed cylindrical shape, and the main discharge end portion makes the circulating water contact the outer surface of the bottom portion of the drum. It is characterized by discharging.

  According to the fifth aspect, by bringing the circulating water into contact with the outer surface of the drum bottom, it is possible to reliably prevent the circulating water from entering the drum and to apply heat to the laundry in the drum. Can do.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the drum has a cylindrical shape, a plurality of through holes are formed in a side wall portion thereof, and the main discharge end portion is A plurality of discharge ports, which are provided above the drum in the water receiving tank and discharge the circulating water, are formed at positions shifted from the through holes.

  According to the sixth aspect of the present invention, the drum side wall is formed with a plurality of through holes for discharging the wash water to the outside during dehydration and the like. Although there is a risk that water may enter the drum, the multiple outlets formed in the main outlet end are formed at positions shifted from these through holes, so the circulating water reaches the through holes in the drum side wall. It is hard to do. Therefore, heat can be applied to the laundry while preventing the circulating water from being absorbed by the laundry in the drum through the through hole in the drum side wall.

  According to a seventh aspect, in the sixth aspect, the first mode in which the position where the circulating water discharged from the discharge port reaches the side wall of the drum is aligned with the position shifted from the through hole, and the through hole It is further characterized by further comprising arrival position switching means for switching to the second mode to match.

  According to the seventh invention, in the first mode, the circulating water discharged from the discharge port reaches a position shifted from the through hole of the drum side wall, so that the circulating water comes into contact with the outer peripheral surface of the drum, Heat can be applied to the laundry through the drum without being absorbed by the laundry in the drum. On the other hand, in the second mode, circulating water discharged from the discharge port reaches the through hole in the drum side wall, whereby the circulating water is supplied into the drum through the through hole and absorbed by the laundry. For this reason, circulating water can be used effectively.

  According to an eighth invention, in any one of the first to seventh inventions, the heating means is provided in the circulation channel.

  According to the eighth aspect, since the heating means is provided in the circulating water channel, the heating means is surely submerged in the circulating water. Therefore, it is possible to reliably prevent the heating means from being exposed.

  According to a ninth invention, in any one of the first to eighth inventions, the circulating water channel is provided separately from the main discharge end, and has a sub-discharge end that discharges the circulating water into the drum. It is characterized by that.

  According to the ninth aspect, since the sub discharge end portion different from the main discharge end portion discharges the circulating water into the drum, the circulating water can be utilized to the maximum extent.

  According to a tenth aspect, in the ninth aspect, a temperature sensor that detects a circulating water temperature in the circulating water channel, and a circulating water discharge destination based on the temperature detected by the temperature sensor, the main discharge end or the sub discharge A discharge destination switching means for switching to the end, and the discharge destination switching means causes the circulating water to be discharged from the main discharge end when the detected temperature is not more than a specified temperature, while the detected temperature is When the temperature exceeds the specified temperature, the circulating water is discharged from the auxiliary discharge end.

  According to the tenth invention, when the circulating water temperature is equal to or lower than the specified temperature, the circulating water is not sufficiently heated, and sufficient heat is not applied to the laundry in the drum. By discharging from the discharge end, heat can be sufficiently applied to the laundry in the drum. On the other hand, when the circulating water temperature exceeds the specified temperature, the circulating water is sufficiently warmed and sufficient heat is applied to the laundry in the drum, so that the sufficiently warmed circulating water is discharged from the sub discharge end. By doing so, warm circulating water is directly supplied to the laundry, and the cleaning effect can be further enhanced. Moreover, circulating water can be used effectively.

  An eleventh invention according to any one of the first to tenth inventions, further comprises a water level sensor for detecting a water level in the water receiving tank, wherein the heating means has a water level detected by the water level sensor at a specified water level. In the following cases, heating of the circulating water is stopped.

  According to the eleventh invention, when the water level in the water receiving tank is a specified water level, for example, the water level just before the heating means is exposed, heating of the circulating water by the heating means is stopped. It is possible to suppress the surroundings from being heated.

  As described above, according to the present invention, the heat retained by the circulating water can be sufficiently and reliably applied to the laundry and the washing water in the drum while suppressing the absorption of the circulating water by the laundry. .

It is a side sectional view showing typically the internal structure of the drum type washing machine concerning Embodiment 1 of the present invention. It is the schematic diagram which looked at the internal structure of the drum type washing machine which concerns on Embodiment 1 from the front. It is the III section enlarged view of FIG. FIG. 2 is a control block diagram of the drum type washing machine according to the first embodiment. It is a FIG. 2 equivalent view of the drum type washing machine which concerns on Embodiment 2 of this invention. It is a control block diagram of the drum type washing machine according to the second embodiment. It is the VII section enlarged view of Drawing 5, (a) is a figure showing the state before reaching regulation temperature of circulating water temperature, and (b) is a figure showing the state after reaching regulation temperature of circulating water temperature. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following description of preferable embodiment is only an illustration essentially, and is not intending restrict | limiting this invention, its application thing, or its use.
Embodiment 1 of the Invention
(Overall configuration of drum type washing machine)
FIG. 1 is a side sectional view schematically showing the internal structure of the drum type washing machine 1 according to the present embodiment. The drum-type washing machine 1 includes a substantially rectangular parallelepiped housing 3, and a front side wall 3a of the housing 3 has a substantially circular entrance / exit 3b for taking in and out the laundry C (see FIG. 2). The doorway 3b is formed and opened and closed by a pivoting operation of the pivotable lid 5. A water receiving tank 7 is accommodated in the housing 3 so as to open to the entrance / exit 3b, and a drum 9 is accommodated in the water receiving tank 7 so as to be rotatable around a rotation axis X extending substantially horizontally. .

  The water receiving tank 7 has a bottomed cylindrical shape, and its central axis substantially coincides with the rotation axis X. The water receiving tank 7 has a bottom wall portion 7a facing the rear side, and an opening 7b formed so as to face the rear wall portion 7a. 3 is connected to the entrance / exit 3b. In addition, a substantially rectangular parallelepiped water storage part 13 for temporarily storing water is formed in the lower part of the water receiving tank 7. An elastic body 15 and a damper 17 are disposed below the water storage section 13, and the water receiving tank 7 is supported by the elastic body 15 and the damper 17 so as to be swingable.

  A drain pipe 19 is connected to the lower portion of the rear end of the water receiving tank 7, and a drain valve 21 is disposed in the middle of the drain pipe 19. While the drain valve 21 is closed, water is stored in the water receiving tank 7, while the water in the water receiving tank 7 is discharged to the outside through the drain pipe 19 while the drain valve 21 is opened. The drain valve 21 is composed of, for example, an electromagnetic valve.

  On the other hand, a water supply port 23 is formed at the central portion of the water receiving tank 7 in the front-rear direction, and a water supply pipe 25 for supplying water from the outside is connected to the water supply port 23. The water supply pipe 25 once extends upward from the water supply port 23 and then extends rearward, and is connected to a water supply (not shown). A water supply valve 27 that opens and closes the water supply pipe 25 is disposed in the middle of the water supply pipe 25. While the water supply valve 27 is open, water is supplied from the water supply port 23 into the water receiving tank 7 through the water supply pipe 25, while the water supply valve 27 is closed to enter the water receiving tank 7. Water supply stops. That is, the water supply port 23, the water supply pipe 25, and the water supply valve 27 constitute water supply means for supplying water into the drum 9.

  The drum 9 has a bottomed cylindrical shape having a smaller diameter than the water receiving tank 7, and, like the water receiving tank 7, the bottom wall portion 9 a faces the rear side, while the opening 9 b faces the same. Is formed. In the cylindrical side wall portion 9c of the drum 9, a large number of circular through holes 9d, 9d,... (See FIG. 3) are formed throughout. FIG. 3 shows only a part of the through holes 9d and 9d. The outer peripheral edge of each through hole 9d is inclined outward in the radial direction of the drum 9 toward the center of the through hole 9d. When the water supply valve 27 is opened and water is supplied from the water supply port 23, water enters the drum 9 through the through holes 9d, 9d,.

  A motor 29 that rotationally drives the drum 9 is disposed on the outer surface of the bottom wall 7 a of the water receiving tank 7. The rotating shaft 29a of the motor 29 passes through the bottom wall portion 7a of the water receiving tank 7 through a bearing (not shown) and is fixed to the bottom wall portion 9a of the drum 9.

  The drum type washing machine 1 is further provided with a circulation mechanism 31 for increasing the cleaning effect by heating and circulating the water in the water receiving tub 7. A specific configuration of the circulation mechanism 31 will be described with reference to FIGS. 1 to 3.

(Configuration of circulation mechanism)
FIG. 2 is a schematic view of the internal structure of the drum type washing machine 1 as seen from the front. FIG. 3 is an enlarged view of part III in FIG. The circulation mechanism 31 includes a circulation channel 33 for taking water from the water storage unit 13 of the water receiving tank 7 and discharging water from the upper end of the water receiving tank 7, and a heater 35 (heating means) installed at the lowest point of the circulation channel 33. And a circulation pump 37 installed downstream of the heater 35 in the circulation water channel 33. In FIG. 1, the portion between the A and A of the circulating water channel 33 is omitted.

  A water intake port 13b is formed in the bottom surface portion 13a of the water storage unit 13, and a water intake end portion 33a that is an upstream end portion of the circulation water channel 33 is connected to the water intake port 13b. The circulating water channel 33 extends downward from the intake port 13b and then extends to the position on the left side of the water receiving tank 7, and extends upward from the downstream end of the lower water channel 39, and the water receiving tank. 7 A side water channel 41 extending to a height position substantially the same as the upper end, and an upper water channel 43 extending rightward from the downstream end (that is, the upper end) of the side water channel 41 are provided. A main discharge end 45 is connected to the downstream end of the upper water channel 43. Therefore, as can be seen from FIG. 2, the main discharge end portion 45 is provided above the lower end of the drum 9.

  As shown in FIGS. 2 and 3, the main discharge end portion 45 is formed with a substantially rectangular parallelepiped nozzle box 47, and the nozzle box 47 extends in the front-rear direction at the upper end of the water receiving tank 7. . The upper end portion of the nozzle box 47 is connected to the downstream end of the upper water passage 43, and the circulating water flowing through the circulation water passage 33 is supplied to the nozzle box 47 from above. A plurality of discharge ports 47b, 47b,... For discharging circulating water are formed in the bottom surface portion 47a of the nozzle box 47 at equal intervals in the front-rear direction. The discharge ports 47b are formed at positions shifted from the through holes 9d, 9d,. Further, the outer peripheral edge of each discharge port 47b extends perpendicularly to the side wall 9c of the drum 9 toward the side wall 9c. Therefore, the circulating water discharged from the discharge ports 47b, 47b,... Reaches the outer peripheral surface of the side wall 9c of the drum 9.

  As shown in FIG. 2, the side water channel 41 of the circulation water channel 33 has two branch water channels 49 and 51. Of these branch water channels 49 and 51, a lower branch water channel, that is, an upstream branch water channel (hereinafter referred to as an upstream branch water channel) 49 extends from the downstream side of the circulation pump 37 to the water storage unit 13 side. 13 is connected to a water inlet 13d formed on the side surface portion 13c. A switching valve 53 for switching the flow path of the circulating water is disposed at a connection portion between the upstream branch water channel 49 and the side water channel 41. The switching valve 53 is composed of, for example, an electromagnetic valve.

  On the other hand, an upper branch water channel, that is, a downstream branch water channel (hereinafter referred to as a downstream branch water channel) 51 extends from the downstream side of the upstream branch water channel 49 to the drum 9 side, and is a side wall portion of the water receiving tank 7. 7c and the side wall portion 9c of the drum 9 pass through, and a sub discharge end portion 55 which is a downstream end portion faces into the drum 9. A switching valve 57 for switching the flow path of the circulating water is disposed at a connection portion between the downstream branch water channel 51 and the side water channel 41. The switching valve 57 is composed of, for example, an electromagnetic valve.

  The heater 35 is disposed in a heater box 59 formed in the lower water channel 39 of the circulation water channel 33. The heater 35 heats the circulating water flowing into the heater box 59. In the heater box 59, a temperature sensor 61 for detecting the temperature of the circulating water flowing through the lower water channel 39 and a water level sensor 63 for detecting the water level in the water receiving tank 7 are disposed.

  The circulation pump 37 is provided on the downstream side of the heater box 59 in the lower water channel 39. The circulation pump 37 sucks the water in the water storage section 13 from the water intake port 13b and supplies the circulation water heated by the heater 35 to the main discharge end 45, the upstream branch water channel 49, or the downstream branch water channel. Pump toward 51.

  The circulation mechanism 31 has the above configuration.

  And in the said housing | casing 3, the control part 65 which controls the said drain valve 21, the water supply valve 27, the motor 29, etc. is provided. FIG. 4 is a control block diagram of the drum type washing machine 1. The control unit 65 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and the like, and controls the motor 29 and the like by the CPU executing a control program stored in the ROM. Then, each process such as washing, rinsing and dehydration is executed.

  In addition to the drain valve 21, the water supply valve 27, and the motor 29, the heater 65, the circulation pump 37, the switching valves 53 and 57, the temperature sensor 61, and the water level sensor 63 are connected to the control unit 65. Based on the output signals from the temperature sensor 61, the water level sensor 63, and the like, the control unit 65, in addition to the drain valve 21, the water supply valve 27, and the motor 29, the heater 35, the circulation pump 37, and the switching valve. 53 and 57 are controlled.

  The control unit 65 stores or drains the water in the water receiving tank 7 by opening and closing the drain valve 21. The controller 65 supplies water into the water receiving tank 7 by opening and closing the water supply valve 27. The control unit 65 can control the switching valves 53 and 57 to switch the discharge destination of the circulating water to the water storage tank 7, the drum 9 or the water storage section 13 below the water reception tank 7. Therefore, these switching valves 53 and 57 and the control part 65 comprise the discharge destination switching means which switches the discharge destination of circulating water.

(Operations in the washing process of the drum type washing machine)
Next, the operation of the drum type washing machine 1, particularly the operation in the washing process will be described.

  First, in a state where the laundry C is put into the drum 9 and the detergent is put into the detergent inlet (not shown), the control unit 65 closes the drain valve 21 and opens the water supply valve 27 to supply water into the water receiving tank 7. To do. At this time, the water supplied into the drum 9 is absorbed by the laundry C. The control unit 65 activates the heater 35 and the circulation pump 37 when water is stored in the water storage unit 13, and controls the switching valves 53 and 57 to supply the circulating water to the lower water channel 39 and the upstream branch water channel. 49 to circulate. Thereby, a detergent can be efficiently dissolved with the heated circulating water.

  Next, when determining that the water level in the water receiving tank 7 has reached the upper end of the water storage unit 13 based on the output signal from the water level sensor 63, the control unit 65 closes the water supply valve 27 and stops water supply. At this time, the water level in the water receiving tank 7 is below the lower end of the drum 9. At the same time, the control unit 65 controls the switching valves 53 and 57 to switch the discharge destination of the circulating water to the main discharge end 45.

  Then, the controller 65 drives the motor 29 to circulate the circulating water with the circulation pump 37 while rotating the drum 9 forward and backward. At this time, the circulating water discharged from the main discharge end 45 flows down to the upper end of the side wall 9c of the drum 9. When flowing down, the circulating water reaches a position shifted from the through holes 9d, 9d,... On the outer peripheral surface of the side wall 9c of the drum 9, so that the circulating water does not pass through the through holes 9d, 9d,. 9 is not absorbed by the laundry. And circulating water falls along the outer peripheral surface of the side wall part 9c, and is stored by the water storage part 13 of the water receiving tank 7 lower part. The circulating water transfers the heat supplied from the heater 35 to the drum 9 when passing through the side wall 9c. The transmitted heat is transmitted to the laundry C in the drum 9.

  Thereafter, when the temperature detected by the temperature sensor 61 reaches a preset specified temperature, it is determined that sufficient heat has been transferred to the laundry C in the drum 9, and the switching valves 53 and 57 are controlled to circulate the circulating water. Is switched to the sub-discharge end 55. At the same time, the heater 35 is stopped. Thereby, the heated circulating water is supplied to the laundry C in the drum 9, and the washing effect is further enhanced.

  When a predetermined washing time has elapsed, the control unit 65 stops the motor 29 and opens the drain valve 21 to drain the water in the water receiving tank 7.

  Then, the control part 65 performs each process of a rinse and spin-drying | dehydration, and complete | finishes a series of processes.

-Effect of Embodiment 1 of the Invention-
According to the embodiment, the main discharge end 45 discharges the heated circulating water so as to contact the outer peripheral surface of the side wall 9c of the drum 9. Therefore, even when the water level in the water receiving tank 7 is lower than the lower end of the drum 9 during the washing process and it is difficult for heat to be transferred from the circulating water to the drum 9, the circulating water reliably contacts the drum 9. The heat stored in the circulating water is reliably transmitted to the laundry C inside the drum 9 through the drum 9.

  Moreover, according to the said embodiment, the main discharge end part 45 is making the circulating water contact the side wall part 9c outer peripheral surface of the drum 9. FIG. That is, since the main discharge end portion 45 makes the circulating water contact from the outside of the drum 9, the circulating water can be prevented from entering the drum 9. Therefore, the circulating water can be prevented from being absorbed by the laundry C in the drum 9.

  As mentioned above, according to the said embodiment, the heat | fever which circulating water holds to the laundry C in the drum 9 fully and reliably is provided, suppressing absorption of the circulating water to the laundry C in the drum 9. be able to.

  Further, according to the above embodiment, since the main discharge end 45 is provided above the lower end of the drum 9, the circulating water discharged from the main discharge end 45 is reliably transferred to the outer peripheral surface of the side wall 9 c of the drum 9. Can be contacted.

  Moreover, according to the said embodiment, circulating water can be made to contact the drum 9 outer peripheral surface by the simple structure that the main discharge end part 45 is provided above the drum 9 lower end.

  Moreover, according to the said embodiment, circulating water can be made to contact the outer peripheral surface of the side wall part 9c of the drum 9 using the water supply port 23. FIG.

  Further, according to the above embodiment, the side wall 9c of the drum 9 is formed with the plurality of through holes 9d, 9d,... When circulating water is supplied from the through holes 9d, 9d,..., The circulating water may enter the drum 9, but the plurality of discharge ports 47b, 47b,. Since it is formed at a position shifted from the through holes 9d, 9d,..., The circulating water hardly reaches the through holes 9d, 9d,. Accordingly, heat can be applied to the laundry C while preventing the circulating water from being absorbed by the laundry C in the drum 9.

  Moreover, according to the said embodiment, since the heater 35 is provided in the lower side water channel 39 which is a part of the circulating water channel 33, the heater 35 is reliably immersed in circulating water. Therefore, it is possible to reliably prevent the heater 35 from being exposed.

  Furthermore, according to the above-described embodiment, the sub-discharge end portion 55 different from the main discharge end portion 45 discharges the circulating water into the drum 9, so that the circulating water can be utilized to the maximum extent.

  Further, according to the above embodiment, when the circulating water temperature is equal to or lower than the specified temperature, the circulating water is not sufficiently heated, and sufficient heat is not applied to the laundry C in the drum 9, so that By discharging water from the main discharge end portion 45, heat can be sufficiently applied to the laundry C in the drum 9. On the other hand, when the circulating water temperature exceeds the specified temperature, the circulating water is sufficiently warmed and sufficient heat is applied to the laundry C in the drum 9, so that the sufficiently warmed circulating water is supplied to the sub-discharge end portion. By discharging from 55, the circulating water warmed to the laundry C can be directly supplied to the laundry C, and the washing effect can be further enhanced. Moreover, circulating water can be used effectively.

Furthermore, according to the above embodiment, since the heating of the circulating water by the heater 35 is stopped when the water level in the water receiving tank 7 is a specified water level, for example, the water level just before the heater 35 is exposed, the heater 35 is exposed. Heating the surroundings can be suppressed.
<< Embodiment 2 of the Invention >>
FIG. 5 is a view corresponding to FIG. 2 of the drum type washing machine 2 according to the second embodiment of the present invention. FIG. 6 is a control block diagram of the drum type washing machine 2. Further, FIG. 7 is an enlarged view of the VII portion of FIG. 5, (a) is a diagram showing a state before the circulating water temperature reaches the specified temperature, and (b) is a state after the circulating water temperature reaches the specified temperature. FIG. In the present embodiment, the downstream branch water channel 51 is not provided, and the discharge port 47b formed in the main discharge end 45 is inclined with respect to the side wall 9c of the drum 9. And different. Other configurations are substantially the same as those of the first embodiment. Therefore, here, a configuration different from that of the first embodiment will be described, and description of other configurations will be omitted.

  As shown in FIG. 7, the discharge ports 47b, 47b,... Formed in the nozzle box 47 of the main discharge end 45 are formed from through holes 9d, 9d,. It is formed at a shifted position. The outer peripheral edge of each discharge port 47b extends so as to incline from the discharge port 47b toward the nearest through hole 9d.

  The control unit 65 controls the water supply valve 27, the drain valve 21 and the motor 29, the heater 35 and the circulation pump 37 based on output signals from the temperature sensor 61 and the water level sensor 63 and the like. Yes.

  Here, a method for supplying circulating water from the nozzle box 47 to the drum 9 will be described. When the controller 65 determines that the circulating water temperature is equal to or lower than a preset specified temperature based on the output from the temperature sensor 61, the controller 65 supplies the circulating water to the nozzle box 47 with the first water. Pump with pressure. Then, as shown to Fig.7 (a), the circulating water discharged from each said discharge outlet 47b flows down substantially perpendicularly downward, and reaches | attains the said through-hole 9d outer periphery. When the controller 65 determines that the circulating water temperature exceeds the specified temperature based on the output of the temperature sensor 61, the controller 65 supplies the circulating water to the nozzle box 47 with respect to the first pump box 37. Pumping is performed at a second pressure higher than the pressure. Then, as shown in FIG.7 (b), the circulating water discharged from each said discharge port 47b flows down substantially drawing a parabola, and reaches | attains the said through-hole 9d. As described above, the circulation pump 37, the discharge port 47b, and the control unit 65 constitute arrival position switching means for switching the arrival position of the circulating water discharged from the discharge port 47b.

  Next, the operation of the drum type washing machine 2, particularly the operation in the washing process will be described. The control unit 65 opens the water supply valve 27 and starts water supply. When the water level in the water receiving tank 7 reaches the upper end of the water storage unit 13, the control unit 65 closes the water supply valve 27 and ends the water supply. Next, the controller 65 controls the switching valves 53 and 57 to switch the discharge destination of the circulating water to the main discharge end 45, and activates the heater 35 and the circulation pump 37 to heat the circulating water. The water storage unit 13, the lower water channel 39, and the upstream branch water channel 49 are circulated. Then, the control unit 65 drives the motor 29 and operates the circulation pump 37 in the first mode in which the circulating water is pumped at the first pressure. Thereby, the circulating water discharged from the main discharge end portion 45 reaches the outer periphery of the through hole 9 d, and the circulating water flows down along the outer peripheral surface of the side wall portion 9 c of the drum 9.

  Next, when the circulating water reaches the specified temperature, the control unit 65 operates the circulating pump 37 in the second mode in which the circulating water is pumped at the second pressure. Thereby, the circulating water discharged from the main discharge end 45 reaches the through hole 9d, enters the drum 9, and is absorbed by the laundry C.

  When a predetermined washing time has elapsed, the control unit 65 stops the motor 29 to stop the rotation of the drum 9 and opens the drain valve 21 to drain the water in the water receiving tank 7.

-Effect of Embodiment 2 of the Invention-
According to the embodiment, in the first mode, the circulating water discharged from the discharge ports 47b, 47b,... Reaches the position shifted from the through holes 9d, 9d,. Thus, the circulating water comes into contact with the outer peripheral surface of the side wall portion 9c of the drum 9, and heat is applied to the laundry C and the washing water through the drum 9 without absorbing the circulating water by the laundry C in the drum 9. be able to. On the other hand, in the second mode, circulating water discharged from the discharge ports 47b, 47b,... Reaches the through holes 9d, 9d,. , 9d,... For this reason, circulating water can be used effectively.

  Moreover, according to the said embodiment, since it is not necessary to provide the downstream branch water channel 51 and the switching valve 53 separately like 1st Embodiment, while being able to suppress a number of parts, control can be simplified. it can.

(Other embodiments)
In the above embodiment, the main discharge end 45 is provided at the upper end of the drum 9. However, the present invention is not limited to this. For example, the main discharge end 45 is lower than the water level in the water receiving tank 7. 7, an injection means for injecting the circulating water upward may be provided. Thereby, circulating water can be made to contact the outer peripheral surface of the side wall part 9c of the drum 9 by injecting circulating water from the drum 9 lower part by an injection means.

  Moreover, in the said embodiment, although the circulating water discharged from the main discharge end part 45 is contacting the side wall part 9c outer peripheral surface of the drum 9, it is not limited to this, For example, the bottom wall part 9a outer surface of the drum 9 You may make circulating water contact. Accordingly, it is possible to reliably prevent circulating water from entering the drum 9 and to apply heat to the laundry C in the drum 9.

  Furthermore, in the said embodiment, although the main discharge end part 45 is provided separately from the water supply port 23, it is not limited to this, For example, the main discharge end part 45 may be integral with the water supply port 23. Thereby, the circulating water can be discharged into the water receiving tank 7 using the water inlet 23.

  Furthermore, in the said Embodiment 2, although the reach | attainment position of the drum 9 of the circulating water discharged from discharge outlet 47b, 47b, ... is changed by changing the pumping pressure of the circulation pump 37, it is not limited to this, For example, the reaching position may be switched by switching the position of the nozzle box 47.

  As described above, the drum type washing machine according to the present invention sufficiently and reliably applies the heat held by the circulating water to the laundry in the drum while suppressing the circulating water from being absorbed by the laundry. It can be applied to use.

1, 2 Drum-type washing machine 7 Water receiving tank 9 Drum 9a Through hole 23 Water inlet (Water supply means)
25 Water supply pipe (water supply means)
27 Water supply valve (water supply means)
33 Circulating water channel 33a Intake end 35 Heater (heating means)
37 Circulation pump (arrival position switching means)
45 Main discharge end 47b Discharge port (arrival position switching means)
51 Downstream branch waterway (discharge destination switching means)
55 Sub-discharge end 57 switching valve (discharge destination switching means)
61 Temperature sensor 63 Water level sensor 65 Control unit (water supply means, arrival position switching means, discharge destination switching means)
X rotation axis

Claims (11)

A water receiving tank capable of storing and draining water, a drum housed rotatably around a substantially horizontal axis in the water receiving tank, water supply means for supplying water into the water receiving tank, and a water intake end portion of the water receiving tank A circulation water channel that is connected to the lower portion of the water discharge tank and has a main discharge end facing the water receiving tank, a circulation pump that sucks water from the intake end and pumps it toward the main discharge end, and the circulation pump. Heating means for heating the circulating water discharged from the main discharge end into the water receiving tank, and the circulating water heated by the heating means during the washing process is contained in the water receiving tank by the circulation pump. A drum-type washing machine that discharges to
The water supply means supplies water so that the water level in the water receiving tank is equal to or lower than the lower end of the drum during the washing process,
The drum-type washing machine, wherein the main discharge end discharges circulating water so as to contact the outer peripheral surface of the drum. In the drum type washing machine according to claim 1,
The drum-type washing machine, wherein the main discharge end portion is provided above the lower end of the drum. In the drum type washing machine according to claim 1 or 2,
The water supply means is provided above the drum in the water receiving tank and has a water supply port for supplying water into the drum.
The drum-type washing machine, wherein the main discharge end is connected to the water supply port. In the drum type washing machine according to claim 1,
A drum characterized in that the main discharge end portion is provided with an injection means that faces the water receiving tank at a position lower than the water level in the water receiving tank and jets the circulating water upward. Type washing machine. In the drum type washing machine according to any one of claims 1 to 4,
The drum has a bottomed cylindrical shape,
The drum-type washing machine, wherein the main discharge end discharges the circulating water so as to contact the bottom outer surface of the drum. The drum type washing machine according to any one of claims 1 to 5,
The drum has a cylindrical shape, and a plurality of through holes are formed in the side wall portion thereof.
The main discharge end is provided above the drum in the water receiving tub, and a plurality of discharge ports for discharging circulating water are formed at positions shifted from the through holes. Machine. In the drum type washing machine according to claim 6,
Reach position switching for switching between a first mode in which the position of the circulating water discharged from the discharge port reaches the side wall of the drum is adjusted to a position shifted from the through hole and a second mode in which the through hole is adjusted to the through hole. The drum-type washing machine further comprising means. In the drum type washing machine according to any one of claims 1 to 7,
The drum type washing machine, wherein the heating means is provided in the circulation channel. The drum type washing machine according to any one of claims 1 to 8,
The drum-type washing machine, wherein the circulation channel is provided separately from the main discharge end and has a sub-discharge end that discharges the circulating water into the drum. In the drum type washing machine according to claim 9,
A temperature sensor for detecting the temperature of the circulating water in the circulating water channel, and a discharge destination switching means for switching the discharge destination of the circulating water to the main discharge end or the sub discharge end based on the temperature detected by the temperature sensor. Prepared,
The discharge destination switching means discharges the circulating water from the main discharge end when the detected temperature is equal to or lower than the specified temperature, and discharges the circulating water to the sub-discharge when the detected temperature exceeds the specified temperature. A drum-type washing machine characterized by being discharged from an end. The drum type washing machine according to any one of claims 1 to 10,
A water level sensor for detecting the water level in the water receiving tank;
The drum type washing machine, wherein the heating means stops heating the circulating water when the water level detected by the water level sensor is equal to or lower than a specified water level.

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