Washing machine

Abstract

The laundry machine (D) of the present application is provided with: a cabinet (1); an outer tub (10) provided in the cabinet (1); an inner tub (11) inserted in the outer tub (10) and provided with a throwing-in port (11k) for throwing in laundry; a water supply unit (30) for supplying a detergent and a liquid to the outer tub (10); and a control unit (20) for controlling the operation of the laundry machine (D), the outer tub (10) has a supply port (k3) for putting in a liquid and a detergent used for washing, and a liquid discharge port (10h) provided at a front bottom portion, a conductivity sensor (19) for detecting the amount of the detergent in the washing liquid is provided between the supply port (k3) and the liquid discharge port (10h), and a stop portion (18b) of a shape for impeding the flow of the detergent toward the liquid discharge port (10h) is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to a washing machine. BACKGROUND

[0002] A drum-type washing and drying machine is provided with a conductivity sensor for performing optimal washing and drying processes.

[0003] The conductivity sensor seeks to find the hardness of washing water for finding the optimal amount of detergent, or measures the degree of rinsing in a rinsing process, or measures the degree of progress of dehydration, and the like.

[0004] As a technology related to the conductivity sensor, for example, there are Patent Documents 1 and 2.

[0005] In Patent Document 1, it is described that the conductivity sensor 28 is provided on the upper side of the heater cover 30.

[0006] In addition, in Patent Document 2, it is described that the contamination degree detection device 39 (conductivity sensor 38) is provided on the upper side of the recess 3a having a sheathed heater.

[0007] PRIOR ART DOCUMENTS

[0008] PATENT DOCUMENTS

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-130844

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-54688 SUMMARY

[0011] PROBLEMS TO BE SOLVED BY THE INVENTION

[0012] However, as described in Patent Documents 1 and 2, the conventional drum-type washing machine in Japan has a washing tub arranged obliquely.

[0013] Therefore, the water flow flows to the back side of the outer tub, and thus the conductivity sensor is arranged at a position where the flow passes along the back side of the outer tub.

[0014] As described above, the conductivity sensor determines the hardness of water, the amount of detergent, the degree of rinsing, dehydration, and the like. Therefore, if the position of the conductivity sensor is not arranged at a place where the water flows in the washing tub, the required detection cannot be performed.

[0015] In addition, the drum-type washing machine in Japan can use a drain valve to block water when water is stored in the washing tub, and can also use a circulating pump to return detergent ingredients to the inside of the washing tub. Furthermore, the washing tub (drum) has an oblique inclination with the front side of the rotating shaft upward in order to save water.

[0016] On the contrary, the drum-type washing machine for overseas markets in Japan has a horizontal rotating shaft of the washing tub, and thus the water flow in the washing tub is different from that of the drum-type washing machine for domestic markets in Japan.

[0017] In addition, since there is no drain valve when water is accumulated in the washing tub, a drain hose connected to the drain pump is installed in a lifted state. Thus, water flows into the drain hose up to the same water level as the washing tub.

[0018] At this time, when detergent is put into the inside of the washing tub, the detergent flows to the drain hose side, and the detergent component is reduced in the washing tub. Thus, the cleaning performance is reduced, or the detergent determination function cannot be well detected. In order to eliminate these disadvantages, the configuration position of the conductivity sensor, the timing of the detergent flow, and the like need to be considered.

[0019] An object of the present application is to solve the above-described problem, and to provide a washing machine capable of well performing detection of a conductivity sensor.

[0020] Solution for solving the problem

[0021] In order to solve the problem, the washing machine of the present application has a cabinet, an outer tub provided in the cabinet, an inner tub inserted in the outer tub and having a detergent input port, a water supply unit supplying a detergent and a liquid to the outer tub, and a control unit controlling the operation of the washing machine, the outer tub having a supply port for the liquid and the detergent used for washing, a drain port provided at a front lower portion, a sensor detecting the amount of the detergent in the washing liquid provided between the supply port and the drain port, and a stopper portion having a shape that hinders the flow of the detergent toward the drain port.

[0022] Effect of the Invention

[0023] According to the present application, a washing machine capable of well performing detection of a conductivity sensor can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is an appearance perspective view of a drum-type washing machine according to an embodiment of the present application.

[0025] Figure 2A is a perspective view of the inside of the drum-type washing machine according to the embodiment, except for the cabinet, viewed from the left front.

[0026] Figure 2B is a perspective view of the inside of the drum-type washing machine according to the embodiment, except for the cabinet, viewed from the left lower front.

[0027] Figure 3Ais a perspective view of the flow of water supply when the inside of the drum-type washing machine of the embodiment except the cabinet is spray-supplied from the upper left rear.

[0028] Figure 3B is a perspective view of the flow of water supply from the front when the inside of the drum-type washing machine of the embodiment except the cabinet is spray-supplied from the upper right front.

[0029] Figure 4 is a perspective view of the water supply from the main valve when the inside of the drum-type washing machine of the embodiment except the cabinet is spray-supplied from the upper left rear.

[0030] Figure 5A is a perspective view of the outer tub from which the drum is removed, viewed from the upper right.

[0031] Figure 5B is a perspective view of the conductivity sensor provided in the heater seating recess of the outer tub.

[0032] Figure 6 is a plan view of the inside of the outer tub except the drum, viewed from above.

[0033] Figure 7 is a front view of the lower portion of the outer tub except the drum, i.e. Figure 6 is an I-direction view of the outer tub except the drum.

[0034] Figure 8 is a perspective view of the heater base, viewed from the upper right.

[0035] Figure 9 is a perspective view of the outer tub except the drum of the comparative example, viewed from the upper right.

[0036] Figure 10 is a flowchart from the start of the operation of the washing process to the start of the washing action.

[0037] Figure 11 is a perspective view of the body of the drum-type washing machine of the embodiment except the cabinet, viewed from the upper left rear.

[0038] Figure 12 is a perspective view of the body of the drum-type washing machine of the embodiment except the cabinet and the control unit, the water supply unit, and the drying unit provided on the outer tub, viewed from the right front.

[0039] Figure 13 is a perspective view of the body of the drum-type washing machine of the embodiment except the cabinet, the control unit, the water supply unit, and the drying unit provided on the outer tub, viewed from the upper left rear.

[0040] Figure 14 is a perspective view of the body of the drum-type washing machine of the embodiment except the cabinet, the control unit, the water supply unit, and the drying unit provided on the outer tub, viewed from the rear. Figure 13The image shows a rear view of a portion of the body of a drum washing machine, including the casing, control unit mounted on the outer tub, water supply unit, and drying unit.

[0041] Figure 15 yes Figure 13 The I direction is the view.

[0042] Figure 16 yes Figure 14 Section II-II view.

[0043] Figure 17 This is a cross-sectional view of the rear plate of the outer tank and the rear water supply cylinder as seen from the front. Detailed Implementation

[0044] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same reference numerals are used to denote the same constituent elements, and the same descriptions will not be repeated.

[0045] The various constituent elements of this invention do not necessarily need to exist independently. It is permissible for a constituent element to be composed of multiple components, multiple constituent elements to be composed of one component, a constituent element to be part of other constituent elements, or a part of a constituent element to be repeated with a part of other constituent elements.

[0046] Figure 1 A perspective view of the exterior of a drum-type washing machine D according to an embodiment of the present invention.

[0047] Figure 2A This is a perspective view of the interior of the drum-type washing machine D, as seen from the left front, excluding the cabinet 1.

[0048] Figure 2B This is a perspective view of the interior of the drum-type washing machine D, as seen from the lower left front, excluding the cabinet 1.

[0049] First, the directions used for illustration are defined. In this embodiment, the horizontal direction of the user's viewpoint in the drum washing machine D is defined as the left-right direction, the vertical direction as the up-down direction, and the depth direction as the front-back direction.

[0050] Figure 1 The drum washing machine D shown is formed by a cabinet 1. The cabinet 1 consists of a U-shaped main body 1b forming the two sides and the back, a chassis (not shown), a front cover 1a located behind the door 2, and an upper cover 1c.

[0051] The two sides and back of the main body 1b are formed from a single piece of steel plate. A chassis (not shown) is positioned below the main body 1b. A front cover 1a covers the front of the main body 1b. An upper cover 1c is positioned on top.

[0052] A door 2 is provided in front of the front cover la of the cabinet 1 in a manner that can be opened and closed. The door 2 is supported by a hinge provided at the left end of the front cover la in a manner that can be opened and closed. The door 2 is opened toward the front by pulling a right upper door opening handle 2a toward the front, and a locking mechanism is disengaged. On the other hand, the door 2 is locked and closed by being pressed against the front cover la.

[0053] As shown in FIG. 1, an outer tub 10 that stores water is provided inside the cabinet 1 of the drum-type washing machine D. Figure 2A

[0054] The outer tub 10 has a drum 11 for receiving laundry inserted therein.

[0055] The outer tub 10 is suspended from the left and right of the cabinet 1 via springs (not shown), and the center of gravity of the outer tub 10 is disposed at the center of the cabinet 1. The lower portion of the outer tub 10 is supported by a vibration-proof member 12 fixed to the cabinet 1.

[0056] A cylindrical saw cover 10c is provided at the front portion of the outer tub 10.

[0057] The drum 11 has a cylindrical main body plate lid 11d (see FIG. 2) and a bottom plate 11s (see FIG. 2) that is a flat plate. Figure 2A Figure 7

[0058] A plurality of dewatering holes 11a for discharging washing water inside the drum 11 to the outer tub 10 are provided in the drum 11.

[0059] A plurality of baffles 14 are provided at the inner circumferential surface of the drum 11. The baffles 14 are members for lifting laundry put into the drum 11.

[0060] The baffles 14 are disposed at intervals in the circumferential direction of the drum 11 in a manner that extends in the front-rear direction of the drum 11.

[0061] The front cover la has a circular opening portion la1 (see FIG. 1) for taking out and putting in laundry at the center of the opening portion of the outer tub 10 (see FIG. 1). Figure 2A Figure 1

[0062] Figure 1 The door 2 shown in FIG. 1 has an operation portion 3 in which an operation switch or the like is provided. The operation portion 3 is a glass touch panel type and is electrically connected to a control unit 20 (see FIG. 2) provided inside the cabinet 1. Figure 3A A drain hose 8 (see FIG. 2) for performing drainage is installed at the right side of the back of the cabinet 1.

[0063] Figure 2A

[0064] Figure 3A ​​​​​​​A perspective view showing the flow of water supply from the front when the inside of the drum-type washing machine D of the embodiment is sprayed with water, as viewed from the upper right front.

[0065] Figure 3B A perspective view showing the flow of water supply from the front when the inside of the drum-type washing machine D of the embodiment is sprayed with water, as viewed from the upper right front.

[0066] Figure 4 A perspective view showing the flow of water supply from the front when the inside of the drum-type washing machine D of the embodiment is sprayed with water, as viewed from the upper right front.

[0067] A water supply hose connection port is provided on the back upper portion of the cabinet 1, and is connected to a water supply valve 31 for supplying water to the drum-type washing machine D from a faucet.

[0068] In Figure 3A A rotating shaft 4 connected to the drum 11 is provided at the rear of the outer tub 10. A pulley 5 is connected to the rotating shaft 4. A motor 13 (refer to Figure 2A ) is connected to the pulley 5 via a belt 6. The motor 13 rotationally drives the drum 11 (refer to Figure 2A ) via the belt 6, the pulley 5, and the rotating shaft 4. The rotating shaft 4 is horizontal or substantially horizontal. Since the rotating shaft 4 is horizontal or substantially horizontal, a model facing overseas from Japan can be provided.

[0069] Figure 3A The control unit 20 controls the rotation speed of the motor 13.

[0070] The control unit 20 performs, for example, the following control.

[0071] An amplitude value detected by a vibration sensor (not shown) provided for vibration prevention during a dehydration process is acquired. Also, during the dehydration process, in a case where a vibration amplitude value of the outer tub 10 detected by the vibration sensor exceeds a threshold value set in advance due to imbalance of laundry put into the drum 11, the dehydration process is temporarily stopped. Then, the drum 11 in which the imbalance of the laundry is generated is made to rotate in the forward direction and the reverse direction, and the imbalance of the laundry is corrected. Thereafter, the dehydration process is again shifted to. When the motor 13 is driven, the drum 11 is rotationally driven in both the forward direction and the reverse direction, and the dehydration process is performed.

[0072] Figure 2A An opening portion 10a of the outer tub 10 and a loading port 1a1 (refer to Figure 1 ) of the cabinet 1 are mainly connected by a bellows 15 that stretches and contracts in the front-rear direction. The bellows 15 is formed of a ring-shaped elastic member, and seals the door 2 and the drum 11 by closing the door 2. In addition, the loading port 1a1 (refer to Figure 1), the opening portion 10a of the outer tub 10, and the opening portion 11k of the drum 11 are communicated.

[0073] Further, by opening the door 2, it is possible to take out the put-in laundry into the drum 11.

[0074] In the upper portion of the cabinet 1 and in the front portion of the water supply hose connection port (not shown), a water supply unit 30 (refer to Figure 3A , Figure 4 ) is provided. The water supply unit 30 has a water supply valve 31, a spray valve 31a, and a main valve 31b.

[0075] When the water supply valve 31 and the spray valve 31a (refer to Figure 3A ) are opened, water flowing from the spray valve 31a is branched to the front side (arrow α11 of Figure 3A ) and the rear side (arrow α12 of Figure 3A ).

[0076] As shown by the arrow α11 of Figure 3A , as to the front side after the branching, as a spray, it flows into the inside of the outer tub 10 from the front water supply port k1 of the front portion of the saw cover 10c shown by Figure 3B .

[0077] As shown by the arrow α12 of Figure 3A , as to the rear side after the branching, it flows in as a spray from the duct portion k2 of the outer tub 10.

[0078] Figure 3A The water supply unit 30 shown by has a detergent storage portion 32a for storing a detergent and a softener storage portion 32b for storing a softener. The detergent storage portion 32a and the softener storage portion 32b are connected to the water supply valve 31 via a hose. The detergent storage portion 32a and the softener storage portion 32b of the water supply unit 30 are pulled out to the front side. Then, in the state of being pulled out in advance, the user puts in the detergent and the softener into the detergent storage portion 32a and the softener storage portion 32b, respectively.

[0079] Figure 3A At the time of washing, if the water supply valve 31 and the main valve 31b shown by Figure 4 are opened, water flows from the water supply hose connection port, and as shown by the arrow α21, it is supplied to the outer tub 10 from the rear water supply port k3 via the detergent storage portion 32a. In the detergent storage portion 32a and the softener storage portion 32b shown by Figure 3A , the detergent is put in by the user in advance, respectively. The detergent is put into the outer tub 10 together with the water supplied from the main valve 31b.

[0080] At the time of rinsing, the softener is put into the outer tub 10 from the softener storage portion 32b together with the supplied water.

[0081] At the time of spinning, the water is drained from the outer tub 10 through the drain hose connection port shown by Figure 2BA drain pump 8p is provided in a drain path of the drain hose 8 provided in the lower portion of the outer tub 10. In a case where the drain pump 8p is not operated, water supplied to the outer tub 10 is stored in the outer tub 10. On the other hand, in a case where the drain pump 8p is operated, the washing water of the outer tub 10 is drained to the outside of the drum-type washing machine D from the drain hose 8.

[0082] The drum-type washing machine D is provided with the drain pump 8p and is not provided with a drain valve that drains the washing water, and thus the washing water can be drained even in a case where the drain position of the washing water is at a position higher than the drum-type washing machine D.

[0083] As Figure 3A indicated, the upper portion of the outer tub 10 in the cabinet 1 (refer to Figure 1 ) is provided with a drying unit 40 that performs drying of laundry. The drying unit 40 is provided with a heating portion 41 in which a heater that heats air is disposed, and a blowing fan 42 that blows air to the heating portion 41.

[0084] The control unit 20, the water supply unit 30, and the drying unit 40 extend in the front-rear direction of the cabinet 1. In addition, the control unit 20, the water supply unit 30, and the drying unit 40 are arranged in the left-right direction. In the present embodiment, the water supply unit 30 is arranged between the control unit 20 and the drying unit 40 in the left-right direction.

[0085] Figure 5A A perspective view of the outer tub 10 excluding the drum 11 as viewed from the upper right.

[0086] Figure 5B A perspective view of the conductivity sensor 19 provided in the heater placement recess 10p of the outer tub 10.

[0087] Figure 6 A plan view of the inside of the outer tub 10 excluding the drum 11 as viewed from above.

[0088] Figure 7 A front view of the lower portion of the outer tub 10 excluding the drum 11, that is, the I-direction view of Figure 6 .

[0089] As Figure 5A indicated, the front lower portion of the saw cover 10c is provided with a drain recess 10o that is recessed downward of the drain port 10h provided. The drain hose 8 is connected to the drain port 10h.

[0090] In the bottom portion of the outer tub 10, a heater placement recess 10p for placing a heater is recessed in a flat, long rectangular shape that is longer in the front-rear direction.

[0091] Adjacent to the left front of the heater mounting recess 10p of the outer groove 10, the sensor mounting recess 10s has a flat cuboid shape and is formed to be recessed downward.

[0092] A sensor mounting recess is provided with 10s. Figure 5B The conductivity sensor 19 is shown. (As shown) Figure 5A As shown, the conductivity sensor 19 is installed at the rear water inlet k3 (refer to...). Figure 4 Between the outlet and the drain outlet for 10 hours.

[0093] The conductivity sensor 19 is configured such that electrodes 19d are approximately symmetrically opposed. The conductivity sensor 19 conducts through the presence of liquid between the opposed electrodes 19d, detecting the properties of the liquid. The conductivity sensor 19 is used to determine water hardness, detergent dosage, rinsing degree, and dehydration degree, among other things.

[0094] The conductivity sensor 19 is located at the bottom of the outer tank 10, but at this time, the water hardness, detergent determination, and rinsing degree of the washing water can be detected as long as the water is submerged.

[0095] To determine the progress of dehydration, it is necessary to detect the flow rate from the dehydration process. Figure 2A The water drains from the dewatering hole 11a of the drain hole in the main body plate 11d of the roller 11 shown. A conductivity sensor 19 needs to be installed to meet these two conditions.

[0096] The conductivity sensor 19 only needs to be positioned below the drum 11 and reliably submerged in the washing water, and the water from the drum 11 flows into the drain outlet 10h at the drain position of the outer tub 10.

[0097] Figure 5A The sensor mounting recess 10s shown is a recess with a depth shallower than that of the heater mounting recess 10p.

[0098] That is, to form from Figure 5A The inner circumferential surface 10n of the outer groove 10 shown in the figure gradually deepens downward in the order of sensor mounting recess 10s and heater mounting recess 10p.

[0099] A heater base 18, on which a heater 17 is mounted, is provided in the heater mounting recess 10p. In this example, the heater 17 is a sheathed heater used to heat the water used for washing with warm water.

[0100] The heater base 18 is a metal plate component of the iron plate used for the burn-out protection of the heater 17.

[0101] Figure 8 This is a perspective view of the heater base 18 viewed from the upper right.

[0102] The heater base 18 is formed into a flat, roughly box-shaped form by machining a metal plate.

[0103] The heater base 18 has a base plate 18a, a front wall portion 18b, a rear wall portion 18c, and a left wall portion 18d with a generally inverted L-shaped cross section.

[0104] The left wall portion 18d has a vertically extending vertical wall 18d1 and a horizontally extending horizontal wall 18d2.

[0105] The rear wall portion 18c has an opening for a connection portion 17a for the heater 17 (see reference). Figure 5A (Connected via port 18c1)

[0106] Four fixing parts 18a1 are provided on the base plate 18a for fixing to the outer tank 10 and for mounting the heater 17.

[0107] The front wall portion 18b follows the shape of the heater base 18 disposed at the bottom of the outer tank 10, and in order to store the washing water (detergent liquid) at the location of the conductivity sensor 19, it obstructs the flow of the washing water.

[0108] The front wall portion 18b is vertically bent from the base plate 18a to a predetermined height h for intercepting washing water (detergent liquid).

[0109] The height h of the front wall portion 18b is set from Figure 5B The range from the lower end 19d1 of the electrode 19d of the conductivity sensor 19 shown to the position where it does not contact the lower roller 11 of the upper roller 11.

[0110] In other words, the height h of the front wall portion 18b is the height at which the washing water (detergent liquid) is stored and the washing volume is accurately measured by the conductivity sensor 19.

[0111] like Figure 7 , Figure 8 As shown, a space, namely gap 18f, is formed between the front wall portion 18b and the left wall portion 18d to allow the washing water and rinsing water to flow without producing sediment.

[0112] like Figure 7 As shown, a small groove (gap 18f) is slightly created in area A on the left. If it were sealed without the gap 18f, there would still be a possibility that dust and dirt would accumulate over time. Therefore, this is addressed by creating a small escape channel (gap 18f).

[0113] Figure 7 The area B on the right side is opened more extensively, serving as the main channel connected to the drainage point of the washing water flow.

[0114] <Detection of washing water dosage by conductivity sensor 19>

[0115] The detection of the detergent amount of the washing water by the conductivity sensor 19 at the time of washing will be described.

[0116] Before the detergent is flowed into the outer tub 10, water is flowed from other flow paths (the front water supply port k1 (refer to Figure 2A ), the pipe portion k2 (refer to Figure 4 ) in advance, and water is supplied to a constant water level s1 (refer to Figure 7 ). At this stage, the portion of the drain hose 8 including the water level s1 is filled with water.

[0117] Figure 9 A perspective view of the outer tub 100 of the comparative example excluding the drum 11 as viewed from the upper right is shown.

[0118] As shown in the comparative example Figure 9 , when the detergent and water are flowed into the outer tub 100 of the washing tub, the water supply port 30k of the water supply position and the drain port 100h of the drain position of the outer tub 100 are connected by the shortest path shown by an arrow β2. Therefore, when the water level of the washing water of the detergent and water in the outer tub 100 rises, as shown by the arrow β2, a part of the water is flowed to the drain hose 108 side through the drain port 100h. That is, in the comparative example, the detergent contained in the washing water is flowed to the drain hose 108 side.

[0119] Therefore, in the present embodiment, as shown in Figure 5A , the front wall portion 18b is provided as a wall that obstructs the detergent from moving toward the drain position.

[0120] As described above, the front wall portion 18b is formed on the heater base 18 provided with the heater 17 disposed at the bottom of the outer tub 10.

[0121] As shown in Figure 5A , by providing the front wall portion 18b of the wall shape that obstructs the flow on the heater base 18, the washing water containing the detergent is intercepted by the front wall portion 18b as shown by the arrow β1. Therefore, the detergent component contained in the washing water remains in the outer tub 10 of the washing tub, and the detection of the detergent amount of the conductivity sensor 19 of the sensor placement recess 10s can be accurately detected approximately equal to the amount of the detergent put in.

[0122] <Operation from the start of the washing process to the start of the washing action>

[0123] Hereinafter, the operation from the start of the washing process through the detection of the detergent amount of the washing water by the conductivity sensor 19 until the start of the washing action will be described in order.

[0124] The control of the drum-type washing machine D is performed by the control unit 20 Figure 3A ) in unison.

[0125] Figure 10 This is a flowchart showing the process from the start of the washing procedure to the beginning of the washing action.

[0126] The user presses the start button to begin operation. Figure 10 Step S11).

[0127] The amount (weight) of clothes put into drum 11 is detected by a weight sensor (not shown). Figure 10 Step S12).

[0128] Open Figure 3A The spray valve 31a shown starts supplying water (step S13). The water supplied from the spray valve 31a is branched into a front side and a rear side.

[0129] As mentioned above, such as Figure 3B As indicated by arrow α11, water on the front side of the branch is sprayed from the front water inlet k1 at the front of the saw housing 10c (see reference). Figure 3B ) flows into the interior of the outer groove 10. On the other hand, such as Figure 3A As indicated by arrow α12, water from the rear side after the branch flows in as a spray from the pipe section k2 of the outer tank 10.

[0130] In this way, water accumulates in the drainage path at the bottom of the outer tank 10, that is, water is supplied until the water level s1 submerges the heater mounting recess 10p and the sensor mounting recess 10s of the outer tank 10 (refer to...). Figure 7 ), close the spray valve 31a (step S14).

[0131] Then, when the main valve 31b is opened, as follows: Figure 4 As indicated by arrow α21, detergent and water are supplied to the outer tank 10 from the rear water inlet k3 through the detergent collection section 32a containing detergent. That is, the main valve 31b is opened to add more detergent and water (step S15). At this time, the washing water is intercepted by the front wall 18b of the heater base 18, and the detergent in the washing water is retained in the heater mounting recess 10p and sensor mounting recess 10s of the outer tank 10.

[0132] Then, water is supplied to the water level s2 below the drum 11 (refer to...). Figure 7 Then the main valve 31b is closed (step S16). At this time, the washing water containing detergent and water will not soak into the clothes inside the drum 11. This is to avoid the sweat of the clothes affecting the detection value of the conductivity sensor 19.

[0133] That is, washing water containing detergent and water is supplied to a water level s2 that does not contact the drum 11 below it (refer to...). Figure 7Then, the drum 11 rotates several times. In this way, the outer tank 10 containing washing water containing detergent and water is placed at the bottom and shaken, and the detergent dissolves in the water.

[0134] Subsequently, the conductivity is detected by the conductivity sensor 19, and the control unit 20 obtains the detergent dosage (step S17). The height of the front wall portion 18b is determined by the following height: detergent liquid accumulates in the heater mounting recess 10p and sensor mounting recess 10s of the outer tank 10, so that the amount of detergent added can be accurately measured by the conductivity sensor 19, and the detergent dosage can be detected by the conductivity sensor 19.

[0135] Then, water is supplied to the predetermined amount for the washing process, the main valve 31b is closed, and the washing operation begins (step S18).

[0136] According to the above structure, with the front wall portion 18b, detergent will not flow into the drain hose 8 side, and the detergent components will remain in the outer tank 10 of the washing tub. This ensures effective cleaning without detergent waste and allows for detergent determination by the conductivity sensor 19.

[0137] Furthermore, in the arrangement of the front wall portion 18b, the front wall portion 18b is formed by changing the shape of the component of the originally planned heater base 18. Therefore, the front wall portion 18b can be formed while reducing costs without producing additional components.

[0138] In addition, such as Figure 7 As shown, since a space, namely a gap 18f, is formed between the front wall portion 18b and the left wall portion 18d to allow the washing water and rinsing water to flow without producing sediment, it is possible to suppress the accumulation of lint and other debris on the heater base 18 during washing and other processes.

[0139] In addition, conventional drum-type washer-dryers have a connection port for adding detergent and water to the washing tank from the water supply unit during washing. This connection port is located at the upper left rear of the main body. Furthermore, a check valve is installed between the water supply port and the washing tank to prevent steam from entering the water supply unit during the drying process.

[0140] Detergent and water are supplied from the water supply unit to the washing tub, and from the upper water supply inlet to the lower washing tub. Therefore, to prevent water and detergent from forcefully entering the washing tub and contacting the drum, the piping is formed in an S-shape.

[0141] Regarding the structure of the aforementioned connection port, as follows: Figure 1In Japanese Patent Application Publication No. H11-114286, as shown in FIG. 1, a water supply path 27 is provided in which a water supply corrugated hose is bent into an S shape in order to prevent high-temperature, high-humidity drying air from intruding into a detergent box 16, to prevent condensate water from the detergent box 16 from dripping, and to prevent leakage of water vapor during a drying course. Further, a structure is described in which the water supply corrugated hose (water supply path 27) is connected to the outer tub (3) in a downward direction.

[0142] In Japanese Patent Application Publication No. 2021-3272, as shown in FIG. 3, a water supply path 50 is formed in which a groove 55 is provided so that supplied water flows to the bottom of the outer tub 2. Further, the supplied water flows to an electrical conductivity sensor 4 provided at the bottom of the outer tub 2.

[0143] However, in Japanese Patent Application Publication No. H11-114286, the water supply corrugated hose (water supply path 27) is connected to the outer tub 3 in a downward direction. However, in the case where the connection of the detergent box 16 to the water supply corrugated hose (water supply path 27) is changed laterally due to space constraints, when a large amount of water flows at once due to high water pressure, the water sometimes comes into contact with the flow path provided in the outer tub 3 and scatters to the side of the rotating drum 1. Further, when detergent adheres to laundry inside the rotating drum 1, the determination of the electrical conductivity sensor can be disturbed. In addition, because the water supply corrugated hose is bent into an S shape by the bend (water supply path 27), a large amount of space is occupied.

[0144] Thus, in the conventional drum-type washing and drying machine, the water hardness used for washing, the amount of detergent contained in the washing water, the degree of rinsing, the degree of dehydration, and the like cannot be accurately grasped, and control of the drum-type washing and drying machine, which must be optimal, such as the washing method, operation control, and the like, cannot be performed.

[0145] Therefore, an object of the present application is to provide a washing machine capable of optimal control, characterized by comprising: a cabinet; an outer tub provided in the cabinet; an inner tub inserted in the outer tub, having a laundry introduction port; a liquid supply unit that supplies a detergent and a liquid to the outer tub; and a liquid supply hose through which the detergent and the liquid from the liquid supply unit pass, the outer tub being connected to the liquid supply hose, and a flow path from a liquid supply connection port that supplies liquid laterally to the outer tub being formed in a shape in which a portion is narrowed.

[0146] The following will be described in detail.

[0147] Figure 11 A perspective view showing the inside of the body of the drum-type washing machine D of the embodiment, excluding the cabinet 1, as viewed from the upper left rear.

[0148] Figure 12Fig. 1 is a perspective view showing the drum-type washing machine D of the embodiment from the right front, and Fig. 2 is a perspective view showing the drum-type washing machine D of the embodiment from the left upper rear.

[0149] First, the directions for explanation are defined. In the present embodiment, the horizontal direction of the viewpoint of the user of the drum-type washing machine D is set as the left-right direction, the vertical direction is set as the up-down direction, and the depth direction is set as the front-rear direction.

[0150] Figure 1 The drum-type washing machine D shown is formed by a cabinet 1. The cabinet 1 is composed of a cabinet main body lb forming both side surfaces and a back surface, a bottom pan (not shown), a front cover la located at the rear of a door 2, and an upper cover lc.

[0151] Both side surfaces and the back surface of the cabinet main body lb are formed in a U shape by a single steel plate. The bottom pan (not shown) is disposed below the cabinet main body lb. The front cover la covers the front surface of the cabinet main body lb. The upper cover lc is disposed at the upper portion.

[0152] A door 2 is disposed in front of the front cover la of the cabinet 1 in a manner capable of being opened and closed. The door 2 is supported by a hinge provided at the left end portion of the front cover la in a manner capable of being opened and closed. The door 2 is opened toward the front by disengaging a lock mechanism by pulling a right upper door opening handle 2a toward the front. On the other hand, the door 2 is locked and closed by being pressed against the front cover la.

[0153] As shown in Figs. 1 and 2, a water storage outer tub 10 is provided inside the cabinet 1 of the drum-type washing machine D. Figure 11 Figure 2A

[0154] The outer tub 10 has a cylindrical main plate lOd and a rear plate lOu (a bottom plate of the outer tub).

[0155] Figure 13 Fig. 3 is a perspective view showing the drum-type washing machine D of the embodiment from the left upper rear, and Fig. 4 is a perspective view showing the drum-type washing machine D of the embodiment from the right upper rear.

[0156] The outer tub 10 is suspended from the left and right of the cabinet 1 (see Fig. 1) via springs (not shown), and the center of gravity of the outer tub 10 is disposed at the center of the cabinet 1. The lower portion of the outer tub 10 is supported by a vibration-proof member 12 fixed to the cabinet 1. Figure 1

[0157] A cylindrical saw cover lOc is provided at the front portion of the outer tub 10.

[0158] As shown in Figs. 1 and 2, a water storage outer tub 10 is provided inside the cabinet 1 of the drum-type washing machine D. Figure 12 ​​​As shown, the roller 11 has a cylindrical roller body plate 11d and a bottom plate 11s that is a flat plate.

[0159] The drum 11 is provided with a plurality of dewatering holes 11a for draining the washing water inside the drum 11 into the outer tank 10.

[0160] like Figure 2A As shown, the inner circumferential surface of the drum 11 has multiple baffles 14. The baffles 14 are components used to lift the clothes that are put into the drum 11.

[0161] The baffles 14 are arranged at intervals around the roller 11 in a manner that extends in the front-rear direction of the roller 11.

[0162] The front cover 1a is located behind door 2 (see reference). Figure 1 ) in relation to outer groove 10 (refer to Figure 2A The opening 11k (inlet) has the same center as the circular opening 1a1 for taking out and putting in clothes (see reference). Figure 1 ).

[0163] Figure 1 The door 2 shown has an operating unit 3 equipped with operating switches and the like. The operating unit 3 is a glass touch panel, and is connected to the control unit 20 (see reference 20) inside the housing 1. Figure 11 Electrical connection.

[0164] The upper back of the housing 1 has a water supply hose connection port (not shown) for supplying water (liquid) from a faucet to the drum washing machine D.

[0165] exist Figure 13 The rear of the outer groove 10 shown is rotatably supported by a rotating shaft 4 connected to the roller 11. A pulley 5 is connected to the rotating shaft 4. A motor 13 is connected to the pulley 5 via a belt 6. The motor 13 is connected to the roller 11 (see reference) via the belt 6, pulley 5, and rotating shaft 4. Figure 3A The rotation is driven by a horizontal axis. The rotation axis 4 is horizontal or approximately horizontal. Because the rotation axis 4 is horizontal or approximately horizontal, it can be designed as a model for use outside of Japan.

[0166] like Figure 11 As shown, a control unit 20 is provided on the upper part of the outer tub 10. The control unit 20 is input with detection signals from the conductivity sensor 19 (described later), and controls the drum washing machine D based on these detection signals.

[0167] Figure 2A The opening 10a of the outer groove 10 and the inlet 1a1 of the box 1 shown (refer to) Figure 1) is connected mainly by a bellows 15 which stretches and contracts in the front-rear direction. The bellows 15 is formed of a ring-shaped elastic member, and seals the door 2 and the drum 11 with water by closing the door 2. In addition, a drop inlet la1 (refer to Figure 1 ) of the cabinet 1, an opening portion 10a of the outer tub 10, and an opening portion 11k of the drum 11 are communicated.

[0168] Further, by opening the door 2, the laundry put in the drum 11 can be taken out via the drop inlet la1, the opening portion 10a, and the opening portion 11k.

[0169] A drain port 10h (refer to Figure 5A ) is provided at a lower portion of the front of the saw cover 10c. A drain hose 8 is connected to the drain port 10h.

[0170] A drain pump 8p (refer to Figure 2B ) is provided on a drain path of the drain hose 8 provided at a lower portion of the outer tub 10 as shown in FIG. 1. In a case where the drain pump 8p is not operated, the water supplied to the outer tub 10 is stored in the outer tub 10. On the other hand, in a case where the drain pump 8p is operated, the washing water of the outer tub 10 is drained to the outside of the drum-type washing machine D from the drain hose 8. Figure 2B

[0171] The drum-type washing machine D is provided with the drain pump 8p, and is not provided with a drain valve which drains the washing water, and thus even in a case where the position at which the washing water is drained is higher than the drum-type washing machine D, the drain pump 8p can be operated to drain the washing water.

[0172] <Water Supply Unit 21U>

[0173] As shown in FIG. 2, a water supply unit 21U is provided at a rear portion in the cabinet 1, and the water supply unit 21U is provided with a water supply valve 21, a spray valve 21a, and a main valve 21b. Figure 11 When the water supply valve 21 and the spray valve 21a are opened, the water flowing from the spray valve 21a is branched to a front side (arrow α11 of

[0174] ) and a rear side (arrow α12 of Figure 11 ). Figure 11 As shown by the arrow α11 of FIG. 3, in the case of the front side after the branching, the water is supplied as a spray from a front water supply port k1 of the front portion of the saw cover 10c to the inside of the outer tub 10 as shown in FIG. 4.

[0175] Figure 11 As shown by the arrow α12 of FIG. 3, in the case of the rear side after the branching, the water is supplied as a spray from a duct portion k2 of the outer tub 10. Figure 2A

[0176] Figure 11

[0177] Figure 11 ​​​​​The water supply unit 21 shown includes a detergent storage section 21e for storing detergent and a fabric softener storage section 21f for storing fabric softener. The detergent storage section 21e and the fabric softener storage section 21f of the water supply unit 21 are pulled forward. Then, in the pre-pulled-out state, the user puts the detergent and fabric softener into the detergent storage section 21e and the fabric softener storage section 21f, respectively.

[0178] During washing, if the water supply valve 21 and the main valve 21b are opened, water will flow in from the water supply hose connection port, such as... Figure 11 As indicated by arrow α21, water is supplied to the outer tank 10 from the rear water inlet k3 via the detergent storage section 21e and the water supply corrugated hose 30. The user pre-fills the detergent and fabric softener into the detergent storage section 21e and fabric softener storage section 21f, respectively. The detergent, along with the water supplied from the main valve 21b, is then added to the outer tank 10.

[0179] During rinsing, the fabric softener and the supplied water are added from the fabric softener collection section 21f through the water supply corrugated hose 30 into the outer tank 10.

[0180] <Drainage Path>

[0181] exist Figure 2B The drain hose 8 at the lower part of the outer tub 10 shown is equipped with a drain pump 8p along its drain path. When the drain pump 8p is not operating, the water supplied to the outer tub 10 is stored inside the outer tub 10. On the other hand, when the drain pump 8p is operating, the washing water in the outer tub 10 is discharged from the drain hose 8 to the outside of the drum washing machine D.

[0182] The front-loading washing machine D has a drain pump 8p but no drain valve for discharging washing water. Therefore, it can still discharge washing water even when the drain position is higher than that of the front-loading washing machine D.

[0183] like Figure 11 As shown, in box 1 (refer to...) Figure 1 The upper part of the outer tank 10 inside the garment is provided with a drying unit 22 for drying clothes. The drying unit 22 includes: a heating unit 22a, which is equipped with a heater for heating air; and a fan 22b for blowing air to the heating unit 22a.

[0184] The control unit 20, the water supply unit 21U, and the drying unit 22 are arranged to extend along the front and rear direction of the housing 1.

[0185] <Conductivity Sensor 19>

[0186] Figure 5A This is a perspective view of the outer groove 10, excluding roller 11, viewed from the upper right. Figure 5BA perspective view of the conductivity sensor 19 disposed in the sensor placement recess 10s of the outer tub 10.

[0187] A lower portion of the front of the saw cover 10c is provided with a drain recess 10o recessed downward from the lower portion provided with the drain port 10h.

[0188] At the bottom of the outer tub 10, a heater placement recess 10p for placing the heater 17 is recessed in a flat, long rectangular shape longer in the front-rear direction.

[0189] Adjacent to the left front portion of the heater placement recess 10p of the outer tub 10, the sensor placement recess 10s has a flat, long rectangular shape and is formed recessed downward.

[0190] In the sensor placement recess 10s is disposed Figure 5B the conductivity sensor 19. The conductivity sensor 19 is disposed so that the electrodes 19d are generally symmetrically opposed. The conductivity sensor 19 detects the conductivity of the liquid by being turned on by the presence of the liquid between the opposed electrodes 19d.

[0191] By measuring the conductivity of the washing water with the conductivity sensor 19, it is possible to determine the hardness of the water used for washing, the amount of detergent put into the outer tub 10, the degree of rinsing, the degree of progress of dehydration, and the like.

[0192] < Rear water supply port k3 >

[0193] Figure 14 A rear view of a portion of the machine body (including a cross section of the rear water supply cylinder 25) excluding the cabinet 1 of the drum-type washing machine D, the control unit 20 disposed on the outer tub 10, the water supply unit 21U, and the drying unit 22, as viewed from the rear. A cylindrical rear water supply cylinder 25 is formed extending laterally from the outer tub 10.

[0194] The rear water supply port k3 is formed at the front end portion of the cylindrical rear water supply cylinder 25 extending laterally from the outer tub 10.

[0195] However, in the case where a large amount of water flows into through the rear water supply port k3 due to high water pressure all at once, contact with the flow path provided in the outer tub 10 occurs, resulting in a phenomenon of flying toward the drum 11 side of the washing tub. Also, in the case where washing water and detergent adhere to the laundry inside the drum 11, there is a concern that the conductivity sensor 19 malfunctions in determining the conductivity of the detergent.

[0196] Therefore, in the present drum-type washing machine D, as will be described later, in the shape of the flow path of the rear water supply cylinder 25 (liquid supply connection port) of the water supply connection port of the outer tub 10, a shape that counteracts the momentum when water flows in is corresponded to.

[0197] < Water supply corrugated hose 30 >

[0198] As shown in FIG. 6, the rear water supply port k3 is connected with a water supply corrugated hose 30. That is, one end of the laterally extending rear water supply tube 25 is connected with the outer tub 10, and the other end is connected with the water supply corrugated hose 30. Figure 13

[0199] Figure 15 indicates a I-I sectional view of FIG. 6. Figure 13 Figure 15 In FIG. 6, the curved tubular water outlet portion 30d of the water supply corrugated hose 30 is shown in a cross section to indicate the inside.

[0200] The water supply corrugated hose 30 has a straight tubular water inlet portion 30a, a U-shaped curved trap 30b, a corrugated tube portion 30c, and a curved tubular water outlet portion 30d. The water supply corrugated hose 30 has the U-shaped curved trap 30b, and thus is compact.

[0201] The water inlet portion 30a is for water and detergent at the time of washing, water and softener at the time of rinsing, and the like, which are supplied to the rear water supply port k3 of the outer tub 10, to flow in through the water supply unit 21U.

[0202] The U-shaped curved trap 30b is a trap having a substantially U-shaped form. The U-shaped curved trap 30b forms a trap by water entering once, and separates the outer tub 10 from the outside space (room). By the U-shaped curved trap 30b, the escape of steam from the outer tub 10 to the outside space (room) is prevented or suppressed. The steam is generated in the warm water operation and the drying operation of the drum-type washing machine D.

[0203] The corrugated tube portion 30c stretches and contracts in the corrugated form with respect to the vibration action of the outer tub 10 at the time of dehydration, and absorbs the displacement of the outer tub 10.

[0204] The water outlet portion 30d is formed after the corrugated tube portion 30c, and has a curved tubular form to be connected with the corrugated tube portion 30c and the rear water supply port k3, as shown in FIG. 6. Figure 13

[0205] <rear water supply tube 25>

[0206] As shown in FIG. 6, the rear water supply tube 25 is formed integrally with the outer tub 10. Figure 14 The rear water supply tube 25 is formed with the rear water supply port k3 at one end, and is connected with the outer tub 10 at the other end.

[0207] <narrow path wall 26>

[0208]

[0209] indicates a II-II sectional view of FIG. 6. Figure 16 Figure 14

[0210] ​​​​​Within the outer groove 10 near the connection portion 25s where the rear water supply cylinder 25 connects to the outer groove 10, a narrow passage wall 26 is formed to narrow the flow path r1 of the rear water supply cylinder 25. That is, as... Figure 15 , Figure 16 As shown, the narrow passage wall 26 has a shape that narrows the flow path r1 into the outer groove 10 while facing the rear plate 10u (bottom plate of the outer groove) of the outer groove 10 towards the rear side. Figure 16 (Hollow arrow α10).

[0211] The narrow road wall 26 is formed as the front part of the flow path r1 from the rear water supply cylinder 25. Figure 15 , Figure 16 The flow path r1 shown protrudes towards the center from the right side. Through the narrow passage wall 26, the cross-sectional area of ​​the flow path r1 in the rear water supply cylinder 25 becomes locally narrower. Therefore, the washing water flowing in the rear water supply cylinder 25... Figure 16 The hollow arrow α10 is guided by the narrow road wall 26 toward the rear plate 10u of the outer groove 10.

[0212] The washing water is directed toward the rear plate 10u of the outer tub 10, thereby preventing the washing water supplied from the rear water supply tube 25 from splashing onto the drum body plate 11d of the drum 11 (see reference). Figure 2A ).

[0213] <Flow path 27 formed in the rear plate 10u of the outer groove 10>

[0214] Figure 17 This diagram shows a cross-section of the rear plate 10u of the outer tank 10 and the rear water supply cylinder 25 as viewed from the front.

[0215] Continuing with the rear water supply cylinder 25, a portion is formed on the rear plate 10u of the outer tank 10, facing downwards, at a position approximately the same as or further rearwards than the rear water supply cylinder 25 in the longitudinal direction. Figure 16 The flow path 27 is located on the left side of the rear water supply cylinder 25. The flow path 27 formed on the rear plate 10u of the outer groove 10 has a groove shape. The embankment 27d forming the flow path 27 is formed so that it does not connect with the bottom plate 11s of the front roller 11 from the rear plate 10u of the outer groove 10 (see reference). Figure 12 The height of contact.

[0216] That is, the flow path 27 formed on the rear plate 10u of the outer groove 10 is on the rearward side ( Figure 16 The flow path is recessed on the left side of the rear water supply cylinder 25. The recessed flow path 27 of the rear plate 10u of the outer groove 10 has a stepped shape along the bottom plate 11s of the roller 11 (see reference). Figure 12 ( ) or in a counter-position, so that washing water does not flow to the drum body plate 11d of the drum 11 (refer to Figure 2A )side.

[0217] This is because, in the main body plate 11d of the roller (refer to...) Figure 2A The roller has multiple dewatering holes 11a. Therefore, when the washing water passes through the dewatering holes 11a and adheres to the clothes inside the roller 11, the dirt on the clothes seeps into the washing water, and the conductivity sensor 19 produces an error in detecting the conductivity of the washing water.

[0218] Because of the bottom plate 11s of the roller 11 (refer to) Figure 12 There are no openings on the drum, so some splashing of wash water is not a problem. However, if the splashing of wash water deviates slightly, it will affect the drum body plate 11d (see reference). Figure 2A The splattered material may adhere to the clothes inside the drum 11 through the dehydration hole 11a, thus forming a shape that minimizes splattering.

[0219] Figure 17 The flow path 27 shown has a first flow path 27a extending obliquely downward and a second flow path 27b extending downward continuously from the first flow path 27a.

[0220] <Guiding Wall 27a1>

[0221] At the beginning of the first flow path 27a, the guide wall 27a1 slopes downward (see reference). Figure 17 The guide wall 27a1 is formed protruding forward from the rear plate 10u of the outer groove 10. Figure 16 Near the side edge 26c of the narrow road wall 26 shown.

[0222] Washing water flowing from the rear water supply pipe 25 into the outer tank 10 (see reference) Figure 17 The arrow α11) collides (bears) with the guide wall 27a1 (guide) formed on the rear plate 10u. Furthermore, as... Figure 17 As indicated by arrow α12, the washing water contacting the guide wall 27a1 is guided downwards, reducing its momentum. Thus, the washing water supplied from the rear water supply cylinder 25 ( Figure 17 Arrow α11) becomes the washing water whose flow momentum weakens in the first flow path 27a1 of flow path 27. Figure 17 Arrow α13), to prevent or suppress washing water from splashing onto the drum body plate 11d of the drum 11 (see reference). Figure 2A ).

[0223] The washing water flowing in the first flow path 27a of the flow path 27 flows downward along the second flow path 27b, which is continuous with the first flow path 27a and extends in the vertical direction. Figure 17 Arrow α14).

[0224] In this way, water and detergent do not come into contact with the clothes inside the drum 11 and flow into the bottom of the outer tub 10. Figure 5Athe arrow β1) and stored in Figure 5A The sensor placement recess 10s provided with the conductivity sensor 19 is shown.

[0225] According to the above structure, in order to weaken the momentum of the washing water from the rear water supply cylinder 25, a guide wall 27a1 shaped toward the upper side is made, and in order to avoid scattering toward the drum main plate 11d (refer to Figure 2A ) side of the drum 11, a channel-shaped flow path 27 (refer to Figure 17 ) is formed in the rear plate 10u of the outer tub 10, whereby water and detergent are not allowed to adhere to the laundry located in the drum tub 11 but are allowed to flow into the portion of the outer tub 10 bottom having the conductivity sensor 19.

[0226] Thus, the determination value of the conductivity sensor 19 can be reliably observed. Therefore, the effect of preventing or suppressing false detection of the conductivity sensor 19 is exerted.

[0227] Thus, accurate and correct determination of the washing water based on the conductivity sensor 19 can be performed, intentional washing control can be accurately performed, and cleaning performance can be improved.

[0228] Thus, optimal washing control of the drum-type washing machine D can be performed.

[0229] <<Other Embodiments>>

[0230] 1. In the above embodiment, as the liquid property detection unit, the conductivity sensor 19 is exemplified, but a liquid property detection unit such as a dirt detection sensor other than the conductivity sensor 19 can also be applied to the present embodiment.

[0231] 2. The present application is not limited to the above-described embodiment, modified example structure, and various modifications and specific modes are possible within the scope of the appended claims.

[0232] Symbol Explanation

[0233] 1 - cabinet; 4 - rotating shaft; 8p - drain pump (liquid discharge pump); 10 - outer tub; 10h - drain port (liquid discharge port); 11 - drum (inner tub); 11k - loading port (opening portion); 17 - heater; 18 - heater base (heater plate); 18b - front wall portion (stop portion); 18f - gap (flow port); 19 - conductivity sensor; 19d - electrode (detection portion of the sensor); 20 - control unit; 30 - water supply unit; s1 - water level (first water level); s2 - water level (second water level); D - drum-type washing machine (washing machine); k3 - supply port (rear water supply port).

Claims

1. A washing machine, characterized in that, have: Box; An outer groove is provided inside the box; The inner tank is inserted into the outer tank and has an inlet for putting in laundry. A water supply unit that supplies detergent and liquid to the outer tank; as well as The control unit controls the operation of the washing machine. The outer tank has: a supply port for the liquid and detergent used for washing; and a drain port located near the front bottom. A sensor for detecting the amount of detergent in the washing liquid is provided between the supply port and the drain port, and a stop portion shaped to obstruct the flow of the detergent toward the drain port is also provided. The height of the stop portion is below the inner groove and above the lower end of the sensor's detection portion.

2. The washing machine according to claim 1, characterized in that, The control unit performs the following control functions: After the water supply unit supplies liquid to a first water level lower than the height of the stop, The water supply unit supplies washing liquid containing the liquid and the detergent to a second water level that is lower than the inner tank and lower than the stop. The sensor is used to detect the amount of detergent in the washing liquid at the second water level.

3. The washing machine according to claim 1, characterized in that, An outlet is provided for the flow of liquid accumulated by the stop portion.

4. The washing machine according to claim 1, characterized in that, The device includes a heater for heating a liquid and a heater plate on which the heater is installed. The stop portion is formed by bending the sheet metal used for the heater.

5. The washing machine according to claim 1, characterized in that, It is equipped with a drain pump for discharging the washing liquid.

6. The washing machine according to claim 1, characterized in that, The rotation axis of the inner groove is configured horizontally or substantially horizontally.

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