JP2019111254A - Washing machine - Google Patents

Abstract

To provide a washing machine capable of heating up detergent water to be sprayed on laundry, with a structure in which a heater hardly gets dirty, without requiring a large structure change.SOLUTION: A fully-automatic washing machine 1 includes: an outer tub 20 elastically supported in a housing 10; a washing and dewatering tub 24 arranged in the outer tub 20; a circulation pump 62 arranged in the housing 10, and for pumping up the water stored in the outer tub 20; and a nozzle head 61 for spraying the water which the circulation pump 62 has pumped up toward the washing and dewatering tub 24. The circulation pump 62 includes a pump casing in which an impeller is arranged, and on an outside wall surface of the pump casing, a heater 63 is mounted for heating the water in the pump casing via the outside wall surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a washing machine.

  Conventionally, a washing machine has been known which pumps up water accumulated in the bottom of the outer tank with a circulation pump and scatters the pumped water from above the washing and dewatering tank into the washing and dewatering tank. For example, Patent Document 1 discloses a laundry having a water passage portion having a wide return port, in which wash water pumped up by a circulation pump is dispersed in a wide width from the return port to an inner tank, that is, a washing and dewatering tank. The machine is described. At the time of the washing step, the washing water is mixed with the detergent, and water containing the detergent (hereinafter, referred to as detergent water) is stored in the outer tub.

JP, 2015-217181, A

  The washing machine of Patent Document 1 does not have the function of heating the detergent water stored in the outer tank to make it warm water, and can widely disperse the washing water and permeate the laundry well. Even when the water temperature is low, such as in winter, it is difficult to fully activate the detergent contained in the detergent water.

  For example, although a configuration may be adopted in which a heater is disposed at the bottom in the outer tank, in this case, there is a concern that the structure of the outer tank needs to be largely changed. In addition, lint, dust and the like generated from the laundry in the washing and dewatering tank may adhere to the heater, which may cause contamination of the heater.

  The present invention is to solve such problems, and to provide a washing machine capable of using as a hot water the detergent water to be sprayed to the laundry with a structure in which the heater is not easily soiled without requiring a large structural change. With the goal.

  The washing machine according to the main aspect of the present invention comprises an outer tub elastically supported in a housing, a washing and dewatering tub disposed in the outer tub, and a washing and dewatering tub disposed in the housing and stored in the outer tub. A pump for pumping the water, and a spraying unit for spraying the water pumped by the pump toward the inside of the washing and dewatering tank. Here, the pump includes a pump casing in which an impeller is disposed, and a heater for heating water in the pump casing via the outer wall surface is attached to the outer wall surface of the pump casing.

  According to the above configuration, the detergent-containing water, that is, the detergent water, can be applied to the laundry with the hot water. As a result, the detergent that has penetrated the laundry by spraying can be sufficiently activated, and the washing performance can be enhanced. In addition, in order to provide the heater, the structure of the pump casing may be partially changed, and a large structural change is unlikely to occur. Furthermore, since the heater does not directly touch the detergent water, there is no possibility that lint, dust, etc. mixed in the detergent water will adhere.

  The washing machine according to the present aspect may be configured to further include a control unit. In this case, the controller operates the heater while intermittently operating the pump in a state where water is stored in the outer tank.

  According to said structure, detergent water becomes easy to flow between an outer tank and a pump, and detergent water can be heated effectively.

  In the washing machine according to this aspect, the spreading unit includes a nozzle facing the inside of the washing and dewatering tank, and includes a nozzle head that jets the water pumped by the pump from the nozzle toward the inside of the washing and dewatering tank. Can be configured.

  According to the above configuration, since the detergent water is sprayed to the laundry by the jet from the nozzle of the nozzle head, the detergent water can be strongly applied to the laundry. As a result, the laundry can be given mechanical power by the impact of detergent water, and washing performance can be further enhanced.

  According to the present invention, it is possible to provide a washing machine capable of using as a hot water the detergent water to be sprayed to the laundry with a structure in which the heater is not easily soiled without requiring a major structural change.

  The effects and significances of the present invention will become more apparent from the following description of the embodiments. However, the following embodiment is merely an example in practicing the present invention, and the present invention is not limited to the one described in the following embodiment.

FIG. 1 is a side sectional view of a fully automatic washing machine according to an embodiment. FIG. 2 is a plan view of the fully automatic washing machine according to the embodiment in which the top plate, the upper lid, the outer tub cover, the outer tub lid, and the hanging rod are omitted. Fig.3 (a) and (b) are the top view and bottom view of a nozzle head based on embodiment, respectively, FIG.3 (c) was attached to the outer tank cover based on embodiment. It is side surface sectional drawing of the nozzle head of a state. FIGS. 4 (a) and 4 (b) are a partial side sectional view and a front view, respectively, of a circulation pump equipped with a heater according to the embodiment. FIG. 5 is a block diagram showing the configuration of a fully automatic washing machine according to the embodiment. FIG. 6 is a flowchart showing the control operation in the warm water jet injection cleaning process according to the embodiment. 7 (a) to 7 (d) are schematic views showing the flow of the cleaning operation performed in the warm water jet spray cleaning step according to the embodiment.

  Hereinafter, the fully automatic washing machine 1 which is one embodiment of the washing machine of the present invention will be described with reference to the drawings.

  FIG. 1 is a side cross-sectional view of a fully automatic washing machine 1 according to the present embodiment. FIG. 2 is a plan view of the fully automatic washing machine 1 in which the top plate 12, the upper lid 15, the outer tub cover 20b, the outer tub lid 23 and the hanging rod 21 are omitted according to the present embodiment.

  The fully automatic washing machine 1 is provided with a housing 10 constituting an appearance. The housing 10 includes a bottomed rectangular tubular body 11 having an open top and a top plate 12 covering the top of the body 11. On the outer bottom surface of the housing 10, legs 13 are provided at four corners. The upper surface plate 12 is formed with an outer insertion port 14 for inserting the laundry. The outer inlet 14 is covered by an openable upper lid 15.

  In the housing 10, the outer tub 20 is elastically suspended and supported by four suspension rods 21 having a vibration isolation device. The outer tank 20 includes a substantially cylindrical outer tank main body 20a whose upper surface is open, and an outer tank cover 20b which constitutes the upper surface of the outer tank 20 by covering the upper surface of the outer tank main body 20a. On the upper surface of the outer tub 20, that is, on the outer tub cover 20b, an inner loading slot 22 for loading the laundry is formed at a position corresponding to the outer loading slot 14. The inner charging port 22 is covered by an outer tub lid 23 so as to be openable and closable.

  In the outer tank 20, a substantially cylindrical washing and dewatering tank 24 whose upper surface is opened is disposed. On the inner circumferential surface of the washing and dewatering tank 24, a large number of dewatering holes 24a are formed over the entire circumference. A balance ring 25 is provided at the top of the washing and dewatering tank 24.

  At the bottom of the outer tank 20, a pulsator 26 is disposed. The surface of the pulsator 26 is formed with a plurality of vanes 26 a extending radially from the center. In addition, on the back surface of the pulsator 26, a plurality of pumping blades 26b extending radially from the center are formed. These pumping blades 26 b are disposed in a pump chamber 27 formed between the back surface of the pulsator 26 and the bottom surface of the washing and dewatering tank 24.

  A circulating water passage 28 extending in the vertical direction is disposed on the inner circumferential surface of the washing and dewatering tank 24. The lower end portion of the circulation channel 28 is connected to the pump chamber 27. A slit-like discharge port 28 a is formed in the upper part of the circulation channel 28. In addition, a lint filter 29 is provided in the circulation channel 28. The water in the pump chamber 27 is sent to the circulation channel 28 by the rotation of the pumping vanes 26 b and discharged from the discharge port 28 a toward the inside of the washing and dewatering tank 24. Thereby, circulating water is applied to the laundry located on the upper side in the washing and dewatering tank 24. Further, the circulating water is returned to the inside of the washing and dewatering tank 24 via the lint filter 29, whereby lint, waste and the like contained in the circulating water are collected by the lint filter 29.

  At an outer bottom portion of the outer tank 20, a drive unit 30 for generating a torque for driving the washing and dewatering tank 24 and the pulsator 26 is disposed. The drive unit 30 includes a drive motor 31, a transmission mechanism 32, a blade shaft 33, and a dewatering tank shaft 34. The blade shaft 33 is connected to the pulsator 26, and the dewatering tank shaft 34 is connected to the washing and dewatering tank 24. The transmission mechanism portion 32 has a clutch mechanism 32a, and by switching operation by the clutch mechanism 32a, the torque of the drive motor 31 is transmitted only to the blade shaft 33 to rotate only the pulsator 26 in the washing step and the rinsing step. In the dewatering process, the torque of the drive motor 31 is transmitted to the blade shaft 33 and the dewatering tank shaft 34 to rotate the pulsator 26 and the washing and dewatering tank 24 integrally.

  A cylindrical drainage port 20 c is formed at the outer bottom of the outer tank 20. A drainage valve 40 is provided at the drainage port 20c. The drain valve 40 is connected to the drain hose 41. When the drain valve 40 is opened, the water stored in the washing and dewatering tank 24 and the outer tank 20 is drained out of the machine through the drain hose 41.

  Above the rear part of the outer tank 20, a water supply unit 50 for supplying tap water into the washing and dewatering tank 24 is provided. The water supply unit 50 includes a water supply valve 51, a detergent box 52, and a water supply nozzle 53. The water supply valve 51 is disposed at the rear of the top plate 12 and is connected to a water supply hose (not shown) extending from the water tap. A detergent is put into the detergent box 52. The tip end of the water supply nozzle 53 penetrates the outer tank cover 20 b, and the water supply port 54 faces the inside of the washing and dewatering tank 24. When the water supply valve 51 is opened, tap water is introduced into the water supply unit 50 from the water tap. The introduced tap water flows out of the water supply port 54 into the washing and dewatering tank 24 through the detergent box 52 and the water supply nozzle 53. At the washing step, since the detergent is put into the detergent box 52, water mixed with the detergent, that is, the detergent water is supplied into the washing and dewatering tank 24.

  In the present embodiment, the fully automatic washing machine 1 is provided with the water injection device 60. The water injection device 60 includes a nozzle head 61, a circulation pump 62, a heater 63, a first connection pipe 64, and a second connection pipe 65. The circulation pump 62 corresponds to the pump of the present invention.

  The nozzle head 61 is disposed above the washing and dewatering tank 24 at a position offset rearward from the central axis C of the washing and dewatering tank 24. The circulation pump 62 is disposed close to the right side surface of the housing 10 at the lower rear in the housing 10. A first connection pipe 64 is disposed between the nozzle head 61 and the circulation pump 62, and a second connection pipe 65 is disposed between the circulation pump 62 and the outer tank 20. The circulation pump 62 can also be disposed close to the left side surface of the housing 10.

  FIGS. 3A and 3B are a plan view and a bottom view of the nozzle head 61 according to the present embodiment, respectively, and FIG. 3C shows an outer tank cover 20b according to the present embodiment. It is side surface sectional drawing of the nozzle head 61 of the state attached to. In FIG. 3C, the nozzle head 61 and the outer tank cover 20b are cut at different positions in the left-right direction.

  The nozzle head 61 has an elongated shape in the left-right direction and a flat shape in the up-down direction, and is configured of an upper member 101 whose lower surface is open and a lower member 102 whose upper surface is open. The upper member 101 and the lower member 102 are formed of, for example, a resin material, coupled in the vertical direction, and fixed by a plurality of screws 103. The upper member 101 and the lower member 102 may be bonded by a bonding method such as heat welding.

  The nozzle head 61 is provided with a circular inlet port 104 extending upward at the right rear. The water discharged from the circulation pump 62 is introduced into the nozzle head 61 from the inlet 104. Further, the nozzle head 61 is provided with a plurality of spherically projecting nozzles 105 on the bottom surface. The plurality of nozzles 105 are arranged at predetermined intervals in the left-right direction, which is the longitudinal direction of the nozzle head 61. Each nozzle 105 is formed with a slit-like injection port 106 which is long in the left-right direction, that is, in the direction in which the nozzles 105 are arranged. The injection port 106 is directed in a direction inclined to the front side opposite to the side of the introduction port 104 with respect to the direction directly below the nozzle head 61 in the front-rear direction, that is, in an oblique front direction.

  The nozzle head 61 is connected to a water injection port 20 d provided with a tip end of the introduction port 104 in the outer tank cover 20 b such that the left and right direction is the left and right direction of the housing 10. The space between the inlet 104 and the water inlet 20 d is sealed by two O-rings 107. In the state where the nozzle head 61 is attached to the outer tub cover 20b, the inlet 104 is positioned closer to the inner peripheral surface side of the washing and dewatering tub 24 than the nozzle 105 in the front-rear direction. Further, the nozzle 105 faces the inside of the washing and dewatering tank 24.

  FIGS. 4A and 4B are a partial side cross-sectional view and a front view, respectively, of the circulation pump 62 equipped with the heater 63 according to the present embodiment.

  The circulation pump 62 includes a pump casing 210, an impeller 220 disposed in the pump casing 210, and a motor 230 for rotating the impeller 220. The pump casing 210 includes a casing main body 211, a casing cover 212, and a suction port pipe 213. The casing main body 211 and the suction port pipe 213 are formed of a heat-resistant resin material such as FRPP, and the casing cover 212 is formed of a metal material such as stainless steel in order to enhance the heat conductivity.

  The casing main body 211 has a cylindrical shape in which the front end face is open and the rear end face is closed. A cylindrical discharge port pipe 214 protruding upward is integrally provided on the circumferential surface of the casing main body 211.

  The casing cover 212 has a substantially disk shape. A cylindrical connection port 215 projecting forward is formed at the central portion of the casing cover 212, and an annular rib 216 projecting rearward is formed at the outer peripheral edge. The casing cover 212 is attached to the front end surface of the casing main body 211 such that the front end portion of the casing main body 211 is fitted into the inside of the rib 216. An O-ring 217 seals the space between the casing body 211 and the rib 216 of the casing cover 212.

  The suction port pipe 213 has a cylindrical shape. The suction port pipe 213 is attached to the casing cover 212 by press-fitting the rear end thereof into the inside of the connection port 215, and protrudes forward from the center of the casing cover 212. An O-ring 218 seals between the suction port pipe 213 and the connection port 215 of the casing cover 212.

  The heater 63 is a round rod-like heater bent to be close to a circle. For example, a sheathed heater is used as the heater 63. The heater 63 is mounted to the casing cover 212, that is, the outer wall surface of the pump casing 210 so as to surround the suction port pipe 213 by the mounting bracket 240. The mounting bracket 240 is fixed to a boss 219 provided on the casing cover 212 with a screw 250. The heater 63 is held down by the mounting bracket 240 and is in close contact with the outer wall surface of the casing cover 212.

  When the motor 230 operates to rotate the impeller 220, water is sucked into the pump casing 210 through the suction port pipe 213, and water is discharged from the inside of the pump casing 210 through the discharge port pipe 214. When the heater 63 operates, the heat of the heater 63 is transmitted to the inside of the pump casing 210 via the casing cover 212, and the water present inside the pump casing 210 is heated.

  FIG. 5 is a block diagram showing the configuration of a fully automatic washing machine 1 according to the present embodiment.

  The fully automatic washing machine 1 includes a control unit 70, an operation unit 80, a water level sensor 91, and a temperature sensor 92 in addition to the configuration described above. The control unit 70 includes a control unit 71, a storage unit 72, a motor drive unit 73, a clutch drive unit 74, a water supply drive unit 75, a pump drive unit 76, a drainage drive unit 77, and a heater drive unit 78. including.

  The operation unit 80 is provided, for example, at the front of the top plate 12. The operation unit 80 is provided with various operation buttons such as a power button 81, a start button 82, and a course selection button 83. The power button 81 is a button for turning on / off the power of the fully automatic washing machine 1. The start button 82 is a button for starting driving. The course selection button 83 is a button for selecting an arbitrary driving course from among a plurality of driving courses related to the washing operation. The operation unit 80 outputs, to the control unit 71, an input signal corresponding to the button operated by the user among various buttons such as the power button 81, the start button 82, and the course selection button 83.

  The water level sensor 91 detects the water level in the outer tank 20, and outputs a water level detection signal according to the detected water level to the control unit 71. Temperature sensor 92 is disposed, for example, at the bottom of outer tub 20 so that the temperature sensing portion thereof faces inside of outer tub 20. The temperature sensor 92 detects the temperature of the water stored in the outer tank 20, and outputs a temperature detection signal corresponding to the detected temperature to the control unit 71.

  The motor drive unit 73 drives the drive motor 31 in accordance with the control signal from the control unit 71. The clutch drive unit 74 drives the clutch mechanism 32 a in accordance with the control signal output from the control unit 71.

  The water supply drive unit 75 drives the water supply valve 51 in accordance with the control signal from the control unit 71. The pump drive unit 76 drives the circulation pump 62 in accordance with the control signal from the control unit 71. The drainage drive unit 77 drives the drainage valve 40 in accordance with the control signal from the control unit 71. The heater driving unit 78 drives the heater 63 in accordance with the control signal from the control unit 71.

  The storage unit 72 includes an EEPROM, a RAM, and the like. The storage unit 72 stores programs for executing the washing operation of various driving courses. The storage unit 72 also stores various parameters and various control flags used to execute these programs.

  The control unit 71 controls the motor drive unit 73, the clutch drive unit 74, the water supply drive unit 75, and the like according to the program stored in the storage unit 72 based on respective signals from the operation unit 80, the water level sensor 91, the temperature sensor 92 and the like. The pump drive unit 76, the drainage drive unit 77, the heater drive unit 78, and the like are controlled.

  In the fully automatic washing machine 1, the washing operation of various operation courses is performed. In the washing operation, a washing step, an intermediate dewatering step, a rinsing step and a final dewatering step are sequentially performed.

  In the washing step and the rinsing step, with the water stored in the washing and dewatering tank 24, the pulsator 26 rotates rightward and leftward. The laundry in the washing and dewatering tank 24 is washed or rinsed by the action of a water flow or the like generated by the rotation of the pulsator 26. In the washing step, since the detergent is mixed in the water supplied into the washing and dewatering tank 24, the washing performance by the detergent is also exhibited.

  In the intermediate dewatering process and the final dewatering process, the washing and dewatering tank 24 and the pulsator 26 rotate together at high speed. The laundry is dewatered by the action of the centrifugal force generated in the washing and dewatering tank 24.

  In the fully automatic washing machine 1 of the present embodiment, the circulation pump 62 operates in a state where water mixed with detergent is stored in the outer tub 20 at least in the washing step. Water in the outer tank 20 is pumped and supplied to the nozzle head 61. Water is jetted from each of the nozzles 105 of the nozzle head 61 toward a partial region of the washing and dewatering tank 24 that is offset rearward from the central axis C, as indicated by an alternate long and short dash line in FIG. The jetted water is agitated by the rotation of the pulsator 26 and hits the upper laundry that has moved to the rear side in the washing and dewatering tank 24. The laundry is not only penetrated by the detergent contained in the water, but is also given mechanical power by the impact when it is hit by high pressure water. As a result, the upper laundry which is difficult for the water flow by the pulsator 26 to reach is washed.

  As described above, by washing the upper laundry close to the water surface or coming out of the water surface well, it is possible to load a large amount of laundry up to the upper side in the washing and dewatering tank 24. It is possible to increase the washing capacity without changing the size of the dewatering tank 24.

  Further, since the nozzle head 61 is provided with the plurality of nozzles 105 at predetermined intervals in the longitudinal direction, even if the laundry hits against some of the nozzles 105 and the injection port 106 is blocked, some of the nozzles 105 are partially removed. The pressure is increased by the amount that the injection port 106 is blocked, and the water whose momentum is increased is injected from the injection port 106 of the other nozzle 105. Therefore, the decrease in the number of the nozzles 105 to which the water is jetted is compensated by the increase in the momentum of the water, and the effect of washing the upper laundry is less likely to be reduced.

  Furthermore, since the injection port 106 of each nozzle 105 has a long shape in the row direction of the nozzles 105, the jetted water overlaps in the row direction and easily hits the laundry, and the water easily hits the laundry uniformly.

  Furthermore, in the nozzle head 61, the inlet 104 is positioned rearward of the nozzles 105. For this reason, in the nozzle head 61, as indicated by solid arrows in FIG. 3C, the flow of water from the inlet 104 is directed directly to the injection ports 106 of the respective nozzles 105, as well as from the inlet 104 Water strikes the front wall and is turned back to produce a water flow toward the injection port 106. Therefore, when the injection port 106 of each nozzle 105 is directed downward, the water ejected from the injection port 106 is more likely to be directed somewhat backward than directly below due to the momentum of the flow of the folded water. In the present embodiment, since the injection port 106 of each nozzle 105 faces obliquely forward, the water injected from the injection port 106 is injected almost directly below the nozzle 105. Therefore, it can be prevented that the water jetted from the respective nozzles 105 comes close to the inner peripheral surface of the washing and dewatering tank 24 and hardly hits the laundry.

  The nozzle head 61 sprays water of high water pressure into the washing and dewatering tank 24 by spraying water from the nozzle 105, and corresponds to the spraying portion of the present invention.

  The fully automatic washing machine 1 of the present embodiment includes a hot water jet injection operation course in which the hot water jet injection washing process is performed as a washing process. In the hot water jet spray cleaning process, water containing detergent stored in the outer tank 20, that is, detergent water is turned into hot water and sprayed from the nozzles 105 of the nozzle head 61 and dispersed in the washing and dewatering tank 24. When the amount of detergent water stored in the outer tank 20 is large, the time required to turn the detergent water into hot water becomes long, and the time required for the entire washing operation becomes long. Therefore, in the present embodiment, priority is given to the washing time, and the hot water jet injection driving course is a driving course for washing small- to medium-volume laundry.

  FIG. 6 is a flowchart showing a control operation in the warm water jet injection cleaning process according to the present embodiment. 7 (a) to 7 (d) are schematic views showing the flow of the cleaning operation performed in the warm water jet spray cleaning step according to the present embodiment.

  When the warm water jet injection cleaning process is started, the control unit 71 opens the water supply valve 51 (S1). As a result, as shown in FIG. 7A, water is supplied from the water supply unit 50 into the outer tank 20. At this time, in the water supply unit 50, since the detergent is put into the detergent box 52, the water supplied to the outer tank 20 contains the detergent. Thus, the water containing the detergent, ie, the detergent water is stored in the outer tank 20. The detergent water also collects in the pump casing 210 of the circulation pump 62.

  The control unit 71 monitors whether the water level in the outer tank 20 has reached the heater operating water level L1 based on the detection result of the water level by the water level sensor 91 (S2). The heater operating water level L1 is, for example, a water level slightly lower than the position of the outer bottom surface of the washing and dewatering tank 24 so that the washing water in the washing and dewatering tank 24 does not touch the detergent.

  When the water level in the outer tank 20 reaches the heater operating water level L1 (S2: YES), the control unit 71 closes the water supply valve 51 (S3). Water supply into the outer tank 20 is stopped. Next, the control unit 71 operates the heater 63 and operates the circulation pump 62 intermittently (S4). At this time, the on time of the intermittent operation may be a time such that the detergent water pumped by the circulation pump 62 stops midway in the first connection pipe 64 and does not reach the nozzle head 61.

  When the circulation pump 62 operates intermittently, the detergent water in the outer tank 20 moves back and forth between the outer tank 20 and the first connection pipe 64 with the circulation pump 62 interposed therebetween. During this time, the detergent water is heated by the heater 63 in the pump casing 210. Thus, the temperature of the detergent water in the outer tank 20 rises.

  When the detergent water in the pump casing 210 is heated, the detergent water gradually flows between the bottom of the outer tank 20 and the pump casing 210 by natural convection. However, as in the present embodiment, when the circulation pump 62 is operated intermittently, detergent water actively flows between the bottom of the outer tank 20 and the pump casing 210. Therefore, the detergent water stored in the outer tank 20 can be effectively heated by the heater 63 at the position of the pump casing 210. When the detergent is a powder detergent, the detergent water is heated while flowing, so that the detergent is easily dissolved in water.

  The control unit 71 monitors whether the temperature of the detergent water in the outer tank 20 has reached the set temperature based on the detection result of the temperature by the temperature sensor 92 (S5). After the detergent water is heated at the heater operating water level L1, when the water is increased to the washing water level L2, the temperature of the detergent water decreases. The preset temperature is predetermined so that the temperature of the detergent water becomes a temperature of about 40 ° C. at which the detergent is easily activated (hereinafter referred to as a target temperature) when the water is accumulated to the washing water level L2 in the outer tank 20. Be For example, the set temperature can be determined based on the amount of water at the heater operating water level L1, the amount of water at the washing water level L2, and the average water supply temperature. Further, the temperature of the feed water may be measured by the temperature sensor 92 until the heater working water level L1 is reached, and the control unit 71 may calculate the set temperature each time using the feed water temperature. The set temperature may be a relatively high temperature of, for example, about 60 ° C. However, since the detergent water is difficult to touch the laundry, the damage to the laundry due to the temperature is less likely to occur.

  When the temperature of the detergent water in the outer tank 20 reaches the set temperature (S5: YES), the controller 71 stops the heater 63 and the circulation pump 62 (S6) and then opens the water supply valve 51 (S7) . Then, the control unit 71 monitors whether the water level in the outer tub 20 has reached the washing water level L2 (S8). When the hot water jet injection operation course is for low to medium capacity laundry, the washing water level L2 is low. As shown in FIG. 7C, detergent water is stored in the outer tank 20 up to the washing water level L2, and the temperature of the detergent water becomes close to the target temperature.

  When the water level in the outer tank 20 reaches the washing water level L2 (S6: YES), the control unit 71 closes the water supply valve 51 (S9). Then, the control unit 71 operates the heater 63 and operates the circulation pump 62 continuously (S10). Thereafter, the heater 63 is on / off controlled by the control unit 71 so as to be maintained at a target temperature, for example, 40.degree. Furthermore, the control unit 71 alternately rotates the drive motor 31 in the right and left directions with the stop interposed, and alternately rotates the pulsator 26 in the right and left directions with the stop interposed (S11). For example, the on time to the left and right of the drive motor 31 can be set to about 2 seconds, and the stop time can be set to about 0.5 seconds. The left on time and the right on time may not be the same time, but different times.

  As shown in FIG. 7 (d), detergent water that has become hot water is jetted from the nozzles 105 of the nozzle head 61. The rotation of the pulsator 26 agitates the laundry, and the laundry which has been moved to the lower side of the nozzle head 61 is sprayed with detergent water and the laundry is washed. At this time, the detergent water is more likely to penetrate to the upper side of the laundry by the jet of the detergent water from each nozzle 105, and furthermore, since the detergent water is hot water, the detergent is sufficiently activated, so a high cleaning effect Can be demonstrated. In addition, since the laundry is given mechanical power by the impact of the jetted detergent water, the washing effect can be further enhanced.

  The control unit 71 monitors whether or not a predetermined washing time has elapsed since the water level in the outer tub 20 reaches the washing water level L2 (S12). When the washing time has elapsed (S12: YES), the control unit 71 stops the heater 63 and the circulation pump 62 (S13), and stops the drive motor 31 to stop the pulsator 26 (S14). Thereafter, the control unit 71 opens the drain valve 40 (S15). Water is discharged from the inside of the outer tank 20, and the hot water jet spray cleaning process is completed.

  When priority is given to the washing capacity over the operation time, the hot water jet injection driving course may be a driving course in which washing from a small-volume laundry to a large-volume laundry can be performed. In this case, the larger the capacity of the laundry and the higher the washing water level L2, the higher the set temperature. However, if the set temperature becomes too high, there is a concern that the circulation pump 62, the outer tank 20, and the like may deteriorate, so the set temperature is provided with an upper limit temperature. If the set temperature is set to the upper limit temperature and becomes lower than the temperature to be originally set, the temperature when the wash water level L2 is reached may be significantly lower than the target temperature. In this case, although the target temperature is eventually reached by the operation of the heater 63 at the wash water level L2, it is preferable that the washing time be lengthened by the delay to the target temperature.

<Effect of the embodiment>
As mentioned above, according to this embodiment, since detergent water can be made warm water and sprayed on the laundry, the detergent that has permeated the laundry can be sufficiently activated by spraying, and the cleaning performance can be enhanced. Moreover, since the heater 63 is attached to the outer wall surface of the pump casing 210 and the detergent water in the pump casing 210 is heated via the outer wall surface, when changing from the washing machine mounted with the circulation pump, Since it is sufficient to partially change the structure of the pump casing 210 in order to provide the heater 63, and also when changing from a washing machine not equipped with a circulation pump, a heater and a box to which the heater is attached under the outer tank 20 There is no need to provide a new, so major structural changes are unlikely to occur. Further, since the heater 63 does not directly touch the detergent water, there is no possibility that lint, dust and the like generated from the laundry and mixed in the detergent water adhere to the heater 63.

  Further, in the present embodiment, the heater 63 is operated while the circulation pump 62 is intermittently operated in a state where the detergent water is stored in the outer tank 20. Therefore, between the outer tank 20 and the circulation pump 62 The detergent water is easy to flow and the detergent water can be heated effectively.

  Furthermore, in the present embodiment, since the detergent water is sprayed to the laundry by the injection from the nozzles 105 of the nozzle head 61, the detergent water can be strongly applied to the laundry. As a result, the laundry can be given mechanical power by the impact of detergent water, and washing performance can be further enhanced.

  As mentioned above, although the embodiment of the present invention was described, the present invention is not limited at all by the above-mentioned embodiment etc. In addition, the embodiment of the present invention can be variously modified in addition to the above. is there.

  For example, in the above embodiment, the circulation pump 62 is operated at the heater operating water level L1 where the amount of water is smaller than the washing water level L2 so that the time required to heat the detergent water stored in the outer tank 20 is as short as possible. A configuration was adopted in which the heater 63 was operated while being operated intermittently. However, the control operation for turning the detergent water into hot water is not limited to the above configuration. That is, although the heating time may be longer than the above configuration, for example, after the detergent water is stored to the washing water level L2 in the outer tank 20, the heater 63 is operated while intermittently operating the circulation pump 62 to A configuration may be adopted in which the circulation pump 62 is switched to continuous operation when the temperature reaches a target temperature at which the detergent tends to be activated. Alternatively, after the detergent water is stored in the outer tank 20 to the washing water level L2, the heater 63 is operated while the circulation pump 62 is continuously operated, and the detergent water temperature is raised to the target temperature while spraying the detergent water on the laundry. A configuration may be adopted.

  Moreover, in the said embodiment, the structure by which detergent water is sprayed on the laundry by injection from each nozzle 105 of the nozzle head 61 is taken. However, the configuration for applying the detergent water to the laundry is not limited to such a configuration, and may be any configuration. For example, a configuration may be adopted in which a shower head is provided above the washing and dewatering tank 24 and the shower-like detergent water is scattered on the laundry. Alternatively, a head portion having a long slit-like opening may be provided above the washing and dewatering tank 24 so that detergent water widely discharged from the slit-like opening may be scattered on the laundry.

  Furthermore, in the above embodiment, the heater 63 is mounted on the outer wall surface of the front end surface of the pump casing 210. However, the heater 63 may be mounted on the outer wall surface of the circumferential surface of the pump casing 210. In this case, it is desirable that the heater 63 has an arc shape that surrounds the circumferential surface of the pump casing 210. Further, it is desirable that the casing main body 211 be formed of a metal material, and the casing cover 212 and the suction port pipe 213 be integrally formed of a resin material.

  Furthermore, in the above embodiment, when there is a concern about the problem caused by the intrusion of lint or the like into the circulation pump 62 or into the nozzle head 61, lint or the like contained in water sucked into the circulation pump 62 upstream of the circulation pump 62. A filter may be provided to collect

  Furthermore, in the above-mentioned embodiment, the example to which the present invention was applied to the fully automatic washing machine 1 in which the drying function of clothes was not equipped was shown. However, the present invention can also be applied to a fully automatic washing and drying machine equipped with the drying function of clothes.

  Besides the above, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

1 Fully automatic washing machine (washing machine)
10 enclosures
20 outer tank
24 laundry dewatering tank
61 nozzle head (dispersion unit)
62 Circulation pump (pump)
63 heater
105 nozzles
210 pump casing
220 impeller

Claims (3)

An outer tank elastically supported in the housing;
A washing and dewatering tank disposed in the outer tank;
A pump disposed in the housing and configured to pump water accumulated in the outer tank;
And a spraying section for spraying water pumped by the pump toward the inside of the washing and dewatering tank,
The pump includes a pump casing in which an impeller is disposed,
A heater for heating water in the pump casing is attached to an outer wall surface of the pump casing via the outer wall surface.
Washing machine characterized by. In the washing machine according to claim 1,
Further comprising a control unit,
The control unit operates the heater while intermittently operating the pump in a state where water is stored in the outer tank.
Washing machine characterized by. In the washing machine according to claim 1 or 2,
The spreading unit has a nozzle facing the inside of the washing and dewatering tank, and includes a nozzle head that sprays the water pumped by the pump from the nozzle toward the inside of the washing and dewatering tank.
Washing machine characterized by.

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