Washing machine

Abstract

A washing machine includes a cabinet, a tub supported in the cabinet, a drum rotatably provided in the tub, a tank (117) for storing a liquid agent, a tank storage box (114) for storing the tank (117), and a liquid agent automatic feeding device (109) for automatically feeding the liquid agent in the tank (117) to the drum. The liquid agent automatic feeding device (109) has a pump unit (111) for sucking and discharging the liquid agent in the tank (117), and the liquid agent discharged from the pump unit (111) is freely dropped to feed the tub. Thus, a washing machine capable of inhibiting the liquid agent discharged from the liquid agent automatic feeding device (109) from remaining and adhering to a liquid agent feeding waterway can be provided.

Description

Technical Field

[0001] This invention relates to a washing machine equipped with an automatic liquid dispensing device. Background Technology

[0002] Patent document 1 discloses a washing machine that automatically dispenses liquid detergent or fabric softener.

[0003] The aforementioned washing machine includes a casing, a water tank, a drum, a can, a can storage box, a water inlet circuit, and an automatic liquid dispensing device. The water tank is supported within the casing using elastic vibration damping. The drum is rotatably supported within the water tank. The can is used to store liquids. The can storage box is used to store the can. The water inlet circuit is located above the can storage box and supplies tap water and liquids. The automatic liquid dispensing device includes a pump that automatically dispenses the liquid from the can into the drum. Thus, the pump supplies the liquid from the can into the water tank via the water inlet circuit and the can storage box.

[0004] However, the configuration of the various components of a washing machine is constrained by design factors. Specifically, the detergent dispensed by the automatic detergent dispenser is supplied to the water tank via various drainage paths, such as tubular pipes, connecting hoses, and rectangular tracks, before being added to the tank. Furthermore, in washing machines typically equipped with a manual detergent dispenser, the detergent dispensed by the automatic dispenser is supplied to the washing tank through the detergent dispenser. Therefore, the water supply path and the path for the detergent dispensed by the automatic dispenser are complex and long. This creates a risk of detergent residue adhering to the drainage path. Moreover, the residue may dissolve unnecessarily, hindering basic washing and rinsing performance. Additionally, if the detergent adheres to a size that closes the drainage path, it may not be able to be discharged.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2004-313234 Summary of the Invention

[0008] The present invention provides a washing machine that can prevent liquid residue discharged from the automatic liquid dispensing device from adhering to the water circuit.

[0009] The washing machine of the present invention includes: a housing; a water tank supported within the housing; a washing tub rotatably disposed within the water tank; and a can storage box located above the water tank, having a storage portion. The washing machine further includes: a can disposed within the storage portion of the can storage box for storing liquid; and an automatic liquid dispensing device that automatically supplies the liquid from the can into the washing tub. The automatic liquid dispensing device has a pump unit for drawing and discharging the liquid from the can, the liquid discharged from the pump unit being configured to fall freely and be supplied to the water tank. This prevents the liquid discharged from the pump unit from adhering to and sticking to the water path until it is supplied to the water tank. As a result, a highly reliable washing machine can be provided. Attached Figure Description

[0010] Figure 1 This is a perspective view of a washing machine according to an embodiment of the present invention.

[0011] Figure 2 This is a diagram showing a longitudinal section of the washing machine according to the above embodiment.

[0012] Figure 3 This is a top view of the automatic liquid dispensing device of the washing machine according to the above embodiment.

[0013] Figure 4 This is a right-side view of the automatic liquid dispensing device of the washing machine according to the above embodiment.

[0014] Figure 5 This is a left-side view of the automatic liquid dispensing device of the washing machine according to the above embodiment.

[0015] Figure 6 This is a left-side cross-sectional view of the automatic liquid dispensing device of the washing machine according to the above embodiment.

[0016] Figure 7 This is an exploded perspective view of the automatic liquid dispensing device of the washing machine according to the above embodiment.

[0017] Figure 8A This is a schematic diagram of the three-way valve unit of the washing machine in the above embodiment when supplying tap water.

[0018] Figure 8B This is a schematic diagram of the three-way valve unit of the washing machine according to the above embodiment when supplying detergent liquid.

[0019] Figure 8C This is a schematic diagram of the three-way valve unit of the washing machine according to the above embodiment when supplying fabric softener.

[0020] Figure 9 This is a cross-sectional view of the pump unit of the washing machine according to the above embodiment.

[0021] Figure 10This is a cross-sectional view of the main part of the detergent tank of the washing machine according to the above embodiment.

[0022] Figure 11 This is a schematic structural diagram of the automatic liquid dispensing device for the washing machine according to the above embodiment.

[0023] Figure 12 This is an exploded perspective view of the detergent dispenser of the washing machine according to the above embodiment.

[0024] Figure 13 This is a bottom perspective view of the detergent dispenser lid of the washing machine according to the above embodiment, which has a float assembly.

[0025] Figure 14A This is a schematic side sectional view showing the remaining volume detection unit of the washing machine according to the above embodiment.

[0026] Figure 14B This is a schematic diagram of the lower surface of the detergent dispenser cap with the float assembly of the washing machine described above.

[0027] Figure 15 This is a schematic side sectional view showing the remaining detergent level detection unit of the washing machine according to the above embodiment, with the detergent tank filled with detergent liquid.

[0028] Figure 16 This is a graph showing the relationship between the detection magnetic force of a linear Hall element and its output voltage.

[0029] Figure 17 This is a graph showing the relationship between the number of times detergent is added to the washing machine according to the above embodiment and the output voltage of the linear Hall element.

[0030] Figure 18 This is a flowchart of the method for determining insufficient detergent balance in the washing machine according to the above-described embodiments. Detailed Implementation

[0031] The embodiments are described in detail below with reference to the accompanying drawings. However, sometimes unnecessary detailed descriptions are omitted. For example, detailed descriptions of matters that are already widely known, or repeated descriptions of substantially the same structures, are sometimes omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0032] (Implementation Method)

[0033] The following describes the washing machine according to this embodiment. Figures 1 to 18 Each item will be explained separately.

[0034] [1-1. Structure]

[0035] [1-1-1. Structure of a washing machine]

[0036] First, refer to Figure 1 and Figure 2 The structure of the washing machine according to this embodiment will be explained.

[0037] Figure 1 This is a perspective view of a washing machine according to an embodiment of the present invention. Figure 2 This is a diagram showing a longitudinal section of the washing machine according to the above embodiment.

[0038] like Figure 1 and Figure 2 As shown, the washing machine of this embodiment includes a housing 101 and a bottomed cylindrical water tank 105 disposed inside the housing 101. The housing 101 forms the outer contour of the washing machine 100. The water tank 105 is elastically and vibration-dampedly supported within the housing 101 by multiple suspension mechanisms (not shown) and dampers 163. A bottomed cylindrical drum 106 (washing tub) is rotatably disposed within the water tank 105. The drum 106 has multiple baffles 106a on its inner wall surface. When the drum 106 rotates at low speed, the baffles 106a apply agitation actions to the clothes, such as hooking the clothes, lifting the clothes upward, and causing the clothes to fall. In addition, the drum 106 has multiple through holes (not shown) formed on its circumferential surface. The water tank 105 has a tub rotation motor (not shown) disposed at the bottom. The tub rotation motor drives the drum 106 to rotate.

[0039] The housing 101 includes a clothing insertion / removal outlet 103 formed on its front surface for taking out and inserting clothing. Additionally, the housing 101 has a cover 102 on its front surface. The cover 102 opens and closes freely to cover the clothing insertion / removal outlet 103. That is, by opening the cover 102, the user can insert clothing into the roller 106 through the clothing insertion / removal outlet 103.

[0040] The housing 101 also includes an automatic liquid dispensing device 109. The automatic liquid dispensing device 109 is located above the water tank 105. Furthermore, the structure of the automatic liquid dispensing device 109 is described in detail in [1-1-2. Structure of the Automatic Liquid Dispensing Device].

[0041] Additionally, the housing 101 has an openable and closable cover 114a at the top. By opening the cover 114a, the detergent can 117 and the fabric softener can 126 can be detachably installed into the opening 114b.

[0042] The cover 102 is provided with an operation display unit 104 on its upper part. The operation display unit 104 includes an operation unit for operation and a display unit for displaying the operation status.

[0043] The housing 101 also includes a controller (not shown). The controller controls the tub rotation motor, etc., to sequentially perform a series of steps such as washing, rinsing, and spin-drying. The controller includes a fabric weight determination unit (not shown) and a liquid detergent dosage calculation unit (not shown). The fabric weight determination unit, for example, detects the torque current value when the tub rotation motor rotates at a certain speed. Based on this torque current value, the fabric weight determination unit classifies, for example, laundry weighing up to 10 kg into approximately 10 categories. Furthermore, the controller determines the amount of water to be used during washing based on the determination result of the fabric weight determination unit. The liquid detergent dosage calculation unit calculates the detergent dosage and fabric softener dosage based on the fabric weight detected by the fabric weight determination unit.

[0044] The washing machine 100 also includes a storage unit (not shown). The storage unit may be composed of, for example, an EEPROM (Electrically Erasable and Programmable Read Only Memory). The storage unit includes a detergent type storage unit (not shown) for storing information related to the type of detergent, and various setting information related to washing operation.

[0045] The washing machine of this embodiment is configured as described above.

[0046] [1-1-2. Structure of the automatic liquid dispensing device 109]

[0047] Next, refer to Figures 3 to 11 Explain the structure of the automatic liquid dispensing device 109.

[0048] Figure 3 This is a top view of the automatic liquid dispensing device of the washing machine according to the above embodiment. Figure 4 This is a right-side view of the aforementioned automatic liquid dispensing device. Figure 5 This is a left-side view of the aforementioned automatic liquid dispensing device. Figure 6 This is a left-side cross-sectional view of the aforementioned automatic liquid dispensing device. Figure 7 This is an exploded perspective view of the aforementioned automatic liquid dispensing device. Figure 8A This is a schematic diagram of the three-way valve unit of the washing machine when supplying tap water. Figure 8B This is a schematic diagram of the three-way valve unit of the washing machine mentioned above when supplying detergent liquid. Figure 8C This is a schematic diagram of the three-way valve unit of the washing machine when supplying fabric softener. Figure 9 This is a cross-sectional view of the pump unit of the aforementioned washing machine. Figure 10 This is a cross-sectional view of the main part of the detergent tank of the aforementioned washing machine. Figure 11 This is a schematic structural diagram of the automatic liquid dispensing device for the aforementioned washing machine.

[0049] As described above, the automatic liquid dispensing device 109 is located above the water tank 105 in the housing 101. The automatic liquid dispensing device 109 includes a water supply unit 110, a pump unit 111, a three-way valve unit 113, and a container 114 housing a detergent container 117 and a fabric softener container 126, as described in detail below. Furthermore, the detergent container 117 and the fabric softener container 126 will be referred to as "containers" in the following description without distinction. Similarly, the liquid detergent and liquid fabric softener will be referred to as "liquid" in the following description without distinction.

[0050] (Water supply unit 110)

[0051] The water supply device 110 is located on the upper part of the housing 101 and includes a water supply passage 110c, a first water supply valve 110a, and a second water supply valve 110b. In addition, the first water supply valve 110a and the second water supply valve 110b will be referred to as "water supply valves" without making a distinction in the following description.

[0052] One end of the water supply passage 110c is connected to a faucet in a water supply pipe or similar facility via a water supply hose (not shown). The water path for supplying tap water is selected by controlling the opening and closing of the first water supply valve 110a and the second water supply valve 110b. The tap water path will be explained in the section on water path structure described later.

[0053] (Three-way valve unit 113)

[0054] The three-way valve unit 113 selectively directs the liquid from the detergent can 117 and the fabric softener can 126, which are installed in the can storage box 114, to the piston pump unit 112 (see reference). Figure 9 The unit that is discharged.

[0055] like Figure 7 As shown, the three-way valve unit 113 includes a detergent-side three-way valve 113a, a fabric softener-side three-way valve 113b, a detergent-side coil 113d, and a fabric softener-side coil 113i, etc. The detergent-side coil 113d drives the detergent-side three-way valve 113a. The fabric softener-side coil 113i drives the fabric softener-side three-way valve 113b.

[0056] like Figure 8A As shown, the three-way valve unit 113 is provided with a water passage 124 for supplying detergent liquid and fabric softener liquid to the pump unit 111. The flow of water in the water passage 124 is controlled by the three-way valve unit 113. The water passage 124 is connected to the detergent side cylinder 111b and the fabric softener side cylinder 111f at the front. Furthermore, the water passage 124 is connected to the second water passage 182 (water passage) and the suction water passage 112h of the piston pump unit 112.

[0057] like Figure 11As shown, the detergent-side three-way valve 113a selectively switches the flow of tap water flowing in the second water passage 182 and the flow of detergent liquid flowing from the detergent tank 117. This allows either tap water or detergent liquid to be supplied to the fabric softener-side three-way valve 113b.

[0058] Next, use Figures 8A to 8C Explain the specific operation of the detergent-side three-way valve 113a.

[0059] The detergent-side three-way valve 113a includes a detergent-side cylinder 113l, a detergent-side plunger 113e, a detergent-side valve core 113f, and a detergent-side spring 113c. The detergent-side plunger 113e is located within the detergent-side cylinder 113l and reciprocates back and forth. The detergent-side valve core 113f is located at the front end of the detergent-side plunger 113e. The detergent-side spring 113c is configured with one end located on the rear wall of the detergent-side cylinder 113l and the other end located at the rear end of the detergent-side plunger 113e. The detergent-side cylinder 113l has an opening a at its front end. A detergent-side coil 113d is provided around the detergent-side cylinder 113l, covering the detergent-side plunger 113e.

[0060] First, such as Figure 8A and Figure 8C As shown, when the detergent-side coil 113d is not energized, the detergent-side plunger 113e is subjected to a forward force from the detergent-side spring 113c. Consequently, the force-applied detergent-side valve core 113f closes the opening b formed at the rear end of the detergent-side cylinder 111b. Therefore, the flow of detergent liquid from the detergent tank 117 is blocked by the detergent-side valve core 113f. At this time, the opening a of the detergent-side cylinder 113l is open. Therefore, tap water flows from the second water passage 182 into the water passage 124 in the direction of arrow X1. The flowing tap water flows through the opening a (arrow X2) of the detergent-side cylinder 113l to the fabric softener-side three-way valve 113b (arrow X3).

[0061] Next, as Figure 8B As shown, when the detergent-side coil 113d is energized, a magnetic field is generated in the detergent-side coil 113d. Therefore, the detergent-side plunger 113e moves backward by overcoming the force of the detergent-side spring 113c using the electromagnetic force received from its own magnetic field. This opens the opening b of the detergent-side cylinder 111b. As a result, the detergent liquid in the detergent tank 117 flows through the opening b into the fabric softener-side three-way valve 113b, as shown by arrows X5 and X6. At this time, the opening a of the detergent-side cylinder 113l is closed by the detergent-side valve core 113f. Therefore, the flow of tap water in the second water passage 182 is blocked by the detergent-side valve core 113f.

[0062] As described above, the flow of tap water from the second water line 182 and the flow of detergent liquid from the detergent tank 117 are switched by the operation of the detergent-side three-way valve 113a. Thus, either tap water or detergent liquid is selectively supplied to the fabric softener-side three-way valve 113b.

[0063] Furthermore, the fabric softener-side three-way valve 113b operates in the same manner as the detergent-side three-way valve 113a, selectively switching the flow of liquid from the detergent-side three-way valve 113a and the flow of fabric softener liquid from the fabric softener tank 126. This configuration allows either tap water or fabric softener to be supplied to the suction water path 112h of the piston pump unit 112.

[0064] Specifically, the fabric softener-side three-way valve 113b, like the detergent-side three-way valve 113a, includes a fabric softener-side cylinder 113m, a fabric softener-side plunger 113j, a fabric softener-side valve core 113k, and a fabric softener-side spring 113h. The fabric softener-side plunger 113j is located within the detergent-side cylinder 113l and reciprocates back and forth. The fabric softener-side valve core 113k is located at the front end of the fabric softener-side plunger 113j. The fabric softener-side spring 113h is configured with one end located on the rear wall of the fabric softener-side cylinder 113m and the other end located at the rear end of the fabric softener-side plunger 113j. The fabric softener-side cylinder 113m is configured to allow liquid from the detergent-side three-way valve 113a to flow in. The fabric softener-side cylinder 113m has an opening c at its front end. A softener-side coil 113i is provided around the softener-side cylinder 113m in such a way as to cover the softener-side plunger 113j.

[0065] First, such as Figure 8A and Figure 8B As shown, when the fabric softener side coil 113i is not energized, the fabric softener side plunger 113j is subjected to a forward force from the fabric softener side spring 113h. Consequently, the fabric softener side valve core 113k, under force, closes the opening d formed at the rear end of the fabric softener side cylinder 111f. Therefore, the flow of fabric softener liquid from the fabric softener tank 126 is blocked by the fabric softener side valve core 113k closing the opening d of the fabric softener side cylinder 111f. At this time, the opening c of the fabric softener side plunger 113j opens. Therefore, as shown by arrows X4 and X7, the detergent liquid or tap water supplied from the detergent side three-way valve 113a to the fabric softener side three-way valve 113b flows from the opening c into the suction water passage 112h of the piston pump unit 112.

[0066] Next, as Figure 8CAs shown, when the fabric softener-side coil 113i is energized, a magnetic field is generated in the fabric softener-side coil 113i. Therefore, the fabric softener-side plunger 113j moves backward by overcoming the force of the fabric softener-side spring 113h using the electromagnetic force received from the magnetic field. As a result, the opening d of the fabric softener-side cylinder 111f is opened. Consequently, the fabric softener liquid in the fabric softener tank 126 flows from the opening d to the suction water passage 112h of the piston pump unit 112, as shown by arrows X8 and X9. At this time, the opening c of the fabric softener-side plunger 113j is closed by the fabric softener-side valve core 113k. Therefore, the flow of liquid from the detergent-side three-way valve 113a is blocked by the fabric softener-side valve core 113k.

[0067] As described above, the flow of liquid from the detergent-side three-way valve 113b and the flow of fabric softener from the fabric softener tank 126 are switched by the operation of the fabric softener-side three-way valve 113a. Thus, either the liquid or the fabric softener is selectively supplied to the suction water path 112h.

[0068] In other words, using the above structure, such as Figure 8A As shown, when neither the detergent-side coil 113d nor the fabric softener-side coil 113i is energized, tap water in the second water passage 182 is supplied to the piston pump unit 112 via the three-way valve unit 113. Additionally, as... Figure 8B As shown, when the detergent-side coil 113d is energized but the fabric softener-side coil 113i is not energized, the detergent liquid in the detergent tank 117 is supplied to the piston pump unit 112 via the three-way valve unit 113. Furthermore, as... Figure 8C As shown, when the detergent-side coil 113d is not energized but the fabric softener-side coil 113i is energized, the fabric softener liquid in the fabric softener tank 126 is supplied to the piston pump unit 112 via the three-way valve unit 113.

[0069] (Pump Unit 111)

[0070] like Figure 7 As shown, the pump unit 111 is configured to draw detergent liquid from the detergent tank 117 or fabric softener liquid from the fabric softener tank 126 and discharge it into the water tank 105.

[0071] The pump unit 111 includes an outer frame 111a and a piston pump unit 112 disposed within the outer frame 111a.

[0072] The outer frame 111a is formed of a resin such as polypropylene, and surrounds and protects the piston pump unit 112. Figure 5 As shown, the outer frame 111a is disposed between the water supply device 110 and the tank storage box 114.

[0073] like Figure 7 and Figure 10As shown, the outer frame 111a has a detergent side tubing 111b extending forward and rearward below the front surface of its outer wall. The front end of the detergent side tubing 111b is inserted into a tubing 123 formed in the lower rear wall of the detergent tank 117. A plurality of separate gaskets 111c are provided on the front outer peripheral surface of the detergent side tubing 111b. Additionally, a protruding rib 111e extending forward is provided at the front of the detergent side tubing 111b. Figure 8A As shown, the rear end of the detergent side drum 111b is connected to the water passage 124. The water passage 124 is connected to the suction water passage 112h of the pump unit 111.

[0074] In addition, such as Figure 7 As shown, the outer frame 111a has a fabric softener side tube portion 111f extending forward and rearward below the front surface of the outer wall. The front end of the fabric softener side tube portion 111f is inserted into a tube portion (not shown) formed on the lower rear wall of the fabric softener container 126. Figure 8A As shown, the rear end of the softener side tube 111f is connected to the water passage 124.

[0075] In addition, such as Figure 7 and Figure 9 As shown, the piston pump unit 112 includes a cylinder 112d, a suction water passage 112h that allows liquid to flow into the cylinder 112d, a discharge water passage 112g that discharges liquid from the cylinder 112d, and a drive motor 112f, etc. The drive motor 112f drives the piston 112e, which is located in the cylinder 112d and can move up and down reciprocally.

[0076] In other words, the cylinder body 112d is formed in a hollow, approximately cylindrical shape (including the cylindrical shape). Inside the cylinder body 112d is a piston 112e capable of reciprocating up and down. The piston 112e is connected to the drive motor 112f via a connecting rod 112a and a cam 112b. Using this structure, the rotation of the drive motor 112f is transmitted to the piston 112e via the connecting rod 112a and the cam 112b, causing the piston 112e to reciprocate up and down.

[0077] Furthermore, the intake water passage 112h and the discharge water passage 112g are connected and installed in the lower part of the cylinder body 112d. The intake water passage 112h and the discharge water passage 112g are located below the piston 112e. As a result, the liquid discharged by the piston 112e can be forcefully discharged downward.

[0078] like Figure 8A As shown, the suction water passage 112h is connected to the outlet e of the water passage 124 and draws the liquid discharged from the three-way valve 113b on the softener side into the receiving part 112c in the cylinder 112d.

[0079] like Figure 9 As shown, the suction water passage 112h is internally equipped with a suction-side check valve 164. The suction-side check valve 164 has a protrusion 164a formed at its lower part. Furthermore, a spring 164b is provided in the suction water passage 112h to exert a downward force on the suction-side check valve 164. The force exerted by the spring 164b causes the protrusion 164a to abut against the stepped portion of the inner wall surface 112i of the suction water passage 112h. This configuration allows the suction-side check valve 164 to move upward, but it will not move further downward from the abutment position on the inner wall surface 112i of the suction water passage 112h towards the cylinder body 112d.

[0080] On the other hand, the discharge water passage 112g constitutes a water passage for discharging liquid from the cylinder 112d. For example... Figure 5 As shown, the discharge water passage 112g is connected to the branch water passage 129a of the connecting hose 129.

[0081] The discharge water passage 112g is internally equipped with a discharge-side check valve 165. The discharge-side check valve 165 has a protrusion 165a formed on its upper part. In addition, a spring 165b is provided in the discharge water passage 112g to apply an upward force to the discharge-side check valve 165. The force applied by the spring 165b causes the protrusion 165a to abut against the stepped portion of the inner wall surface 112j of the discharge water passage 112g. This configuration allows the discharge-side check valve 165 to move downward, but it will not move further upward toward the cylinder body 112d from the position of abutment against the inner wall surface 112j of the discharge water passage 112g.

[0082] Furthermore, when the piston 112e moves upward, a negative pressure is created inside the receiving portion 112c of the cylinder 112d, thus applying an upward force to the suction-side check valve 164. At this time, since the upward force is greater than the combined force of the gravity (self-weight) of the suction-side check valve 164 and the elastic force of the spring 164b, the suction-side check valve 164 moves upward. As a result, a gap is created between the protrusion 164a of the suction-side check valve 164 and the inner wall surface 112i of the suction water passage 112h. Consequently, the liquid passing through the three-way valve unit 113 flows through the gap into the suction water passage 112h and into the cylinder 112d.

[0083] On the other hand, when the piston 112e moves downward, positive pressure is created inside the receiving portion 112c of the cylinder 112d, thus applying a downward force to the discharge-side check valve 165. When the combined force of the discharge-side check valve 165's weight and the downward force applied to it exceeds the elastic force of the spring 165b exerting an upward force on the discharge-side check valve 165, the discharge-side check valve 165 moves downward. This creates a gap between the protrusion 165a of the discharge-side check valve 165 and the inner wall surface 112j of the discharge water passage 112g. As a result, the liquid inside the receiving portion 112c of the cylinder 112d flows through this gap into the discharge water passage 112g and is discharged into the branch water passage 129a.

[0084] In addition, such as Figure 5 As shown, the discharge water passage 112g is connected to a branch water passage 129a of the connecting hose 129. The connecting hose 129 is a hose that connects the drain port 114c of the can storage box 114 to the water tank 105. Thus, when the piston 112e moves downward, the liquid in the storage part 112c of the cylinder 112d is discharged into the water tank 105 via the branch water passage 129a of the connecting hose 129, which is connected to the discharge water passage 112g.

[0085] The piston 112e of the piston pump unit 112 repeatedly moves up and down as described above. Thus, as... Figure 11 As shown, the detergent liquid in the detergent tank 117 and the fabric softener liquid in the fabric softener tank 126 are drawn into the pump unit 111 and discharged into the water tank 105.

[0086] In this embodiment, the above-mentioned suction water path 112h, discharge water path 112g, and branch water path 129a are arranged in a generally vertical direction (including the vertical direction) so that the liquid or the like can fall freely.

[0087] (Can storage box 114)

[0088] like Figure 3 As shown, the can storage box 114 constitutes a container with a storage section having an opening on the upper surface. A detergent can 117 and a fabric softener can 126 are detachably mounted on the rear side of the storage section of the can storage box 114. A detergent dispenser 115 is detachably mounted on the front side of the storage section of the can storage box 114.

[0089] In addition, such as Figure 10 As shown, the can storage box 114 has an insertion hole 114d formed on the lower rear wall. The detergent side cylinder 111b of the pump unit 111 is inserted into the insertion hole 114d.

[0090] like Figure 3 and Figure 4As shown, a water inlet channel 116 for supplying tap water is provided on the upper part of the tank storage box 114. The water inlet channel 116 and... Figure 11 The first upper water inlet 114e and the second upper water inlet 114f, which are formed on the left and right side walls of the upper part of the detergent container 114, are connected. Tap water flowing in the water inlet 116 is injected into the detergent storage section 115b of the detergent container 115 through the first upper water inlet 114e. In addition, tap water flowing in the water inlet 116 is injected into the fabric softener storage section 115c of the detergent container 115 through the second upper water inlet 114f.

[0091] In addition, such as Figure 5 As shown, the can storage box 114 has linear Hall elements 136 disposed on the left and right side walls. The linear Hall elements 136 are, for example, composed of analog elements.

[0092] like Figure 4 As shown, the can storage box 114 is provided with a lower water inlet 114g on the lower part of its side wall. The lower water inlet 114g is connected to the bypass water passage 184 described later.

[0093] like Figure 6 As shown, the can storage box 114 has a drain outlet 114c formed at the bottom. One end of the connecting hose 129 is connected to the drain outlet 114c. The other end of the connecting hose 129 is oscillatingly connected to the water tank 105. The connecting hose 129 is connected to a branch water passage 129a that branches off vertically from the middle. The branch water passage 129a is connected to the discharge water passage 112g of the pump unit 111 as described above.

[0094] (Detergent container 117 and fabric softener container 126)

[0095] like Figure 10 As shown, the detergent container 117 and the fabric softener container 126 constitute a container having an opening 118 on the upper surface.

[0096] The detergent can 117 includes a first rib 117d and a second rib 117e formed on the upper periphery. The first rib 117d and the second rib 117e are formed to extend in the outward peripheral direction. A gasket 117f is provided between the first rib 117d and the second rib 117e.

[0097] A detergent can lid 119 is installed on the upper part of the detergent can 117, which can be opened and closed to cover the opening 118 on the upper surface. When the detergent can lid 119 is installed on the upper part of the detergent can 117, the gasket 117f is flattened, thereby liquid-tightly fixing the detergent can 117. Thus, even if the detergent can 117 is laid on its side, for example, leakage of detergent liquid from the detergent can 117 is prevented. Alternatively, the gasket 117f can also be provided on the side of the detergent can lid 119 instead of the side of the detergent can 117, and the same effect can be achieved.

[0098] In addition, such as Figure 10 As shown, the detergent tank 117 has a rearwardly extending cylindrical portion 123 below the rear wall 117a. A through hole 123a is formed within the cylindrical portion 123. A check valve 123b is installed on the inner circumferential surface of the cylindrical portion 123. The check valve 123b is configured to allow flow to the inside of the detergent tank 117 ( Figure 10 (towards) but not towards the outside of detergent can 117 (towards) Figure 10 (Rotation of the rear side).

[0099] Using the above structure, when the detergent tank 117 is installed in the tank storage box 114, the detergent-side cylinder portion 111b of the pump unit 111 is inserted into the cylinder portion 123 of the detergent tank 117. At this time, the protruding rib 111e of the detergent-side cylinder portion 111b pushes open the check valve 123b. As a result, the detergent liquid in the detergent tank 117 flows through the through hole 123a to the three-way valve unit 113.

[0100] On the other hand, when the detergent can 117 is pulled out of the self-contained can storage box 114, the check valve 123b... Figure 10 The cylinder rotates backward as shown. Therefore, the through hole 123a of the cylinder 123 is closed by using the check valve 123b. This prevents the detergent liquid from leaking from the detergent tank 117.

[0101] In addition, such as Figure 12 As shown, the detergent container 117 includes a handle 117g formed on its front outer wall. The handle 117g is positioned at a distance from the wall of the detergent container 117. This allows the user to grip the handle 117g. Furthermore, by gripping the handle 117g and pulling the detergent container 117 forward, the user can pull the detergent container 117 out of the container storage box 114. In this case, the user can, for example, insert their fingers into the gap between the handle 117g and the detergent container 117 from above or below to grip the handle 117g. Alternatively, the user can insert their thumb into the gap between the handle 117g and the detergent container 117 from above, and also insert the other two or three fingers from below to grasp the handle 117g.

[0102] At this point, when pulling out the detergent bottle 117 inserted into the storage compartment of the container 114 by pinching the gripping part 117g from below, the wrist needs to be placed in the narrow space of the storage compartment of the detergent container 115, thus causing wrist constriction. Therefore, the fingers are inserted from above into the gap between the gripping part 117g and the detergent bottle 117. As a result, the wrist position is not restricted, and the detergent bottle 117 can be pulled out easily.

[0103] Furthermore, the fabric softener container 126 is constructed in the same manner as the detergent container 117, so it will not be described further.

[0104] (Mesh component 122)

[0105] like Figure 10 As shown, the mesh member 122 is detachably disposed within the detergent tank 117. The mesh member 122 is made of resin such as polypropylene. The mesh member 122 has through-holes 122a formed in a mesh shape that extend through both the front and back. The mesh member 122 filters the detergent liquid within the detergent tank 117. This prevents foreign matter and adhering detergent liquid from clogging the detergent side drum portion 111b.

[0106] like Figure 10 As shown, the upper and lower ends 122d of the mesh member 122 are bent at both ends along its length, and the mesh member 122 has a locking claw 122e on its back surface near the upper end. The locking claw 122e includes a locking rib 122b and a protrusion 122c, etc. The locking rib 122b is formed to extend along the back surface direction of the mesh member 122. The protrusion 122c is formed convexly at the top end portion of the locking rib 122b.

[0107] On the other hand, such as Figure 10 As shown, the detergent container 117 includes a hook portion 121 formed on the bottom surface 120. The hook portion 121 includes an upright portion 121a and an extension portion 121b, etc. The upright portion 121a is formed upright, substantially vertically (including vertically), from the bottom surface 120 of the detergent container 117. The extension portion 121b is formed extending from the top end of the upright portion 121a toward the rear side of the detergent container 117. The hook portion 121 engages with the lower end 122d of the mesh member 122. In addition, the detergent container 117 includes a protrusion 117b formed on the rear wall 117a and protruding toward the inside of the detergent container 117. The protrusion 117b engages with the protrusion 122c of the engaging claw 122e of the mesh member 122.

[0108] At this point, considering the following aspects, the mesh component 122 is snapped into the detergent tank 117 in an inclined direction.

[0109] In other words, detergent solutions typically have a high viscosity. Therefore, if the mesh member 122 is horizontally positioned within the detergent tank 117, the detergent may not pass through the through-hole 122a of the mesh member 122. This could potentially create an air pocket in the detergent tank 117 below the mesh member 122 where no detergent solution exists. Therefore, the mesh member 122 is positioned at an angle within the detergent tank 117. As a result, the detergent solution flows downwards along the surface of the mesh member 122 under gravity, passing through the through-hole 122a. This prevents the formation of an air pocket in the detergent tank 117 below the mesh member 122.

[0110] In addition, the mesh component 122 is installed inside the detergent tank 117 using the following method.

[0111] First, insert the lower end 122d of the mesh member 122 between the extension 121b of the detergent dispenser 117 and the bottom surface 120. In this state, move the mesh member 122 towards... Figure 10 Press in the direction of arrow C as shown. At this time, as... Figure 10 As shown by the double-dotted line, the protrusion 122c of the mesh member 122 flexes in the direction of arrow D, and the rear wall 117a of the detergent tank 117 flexes in the direction of arrow E. The flexed protrusion 122c extends below the protrusion 117b. Thus, the protrusion 122c of the engaging claw 122e engages with the protrusion 117b of the detergent tank 117. As a result, the mesh member 122 is fixedly held within the detergent tank 117 in an inclined direction.

[0112] On the other hand, the mesh component 122 can be removed from the detergent tank 117 using the following method.

[0113] Specifically, towards Figure 10 Arrow C indicates that the mesh member 122 is pressed in the direction shown, causing the rear wall 117a to move towards... Figure 10 The arrow E indicates that the mesh member 122 bends in the direction of the protrusion 117b. As a result, the mesh member 122 can be easily pulled out of the detergent dispenser 117.

[0114] (Detergent dispenser 115)

[0115] like Figure 3 As shown, the detergent dispenser 115 is detachably disposed in the can storage box 114 at a position forward of the detergent can 117 and the fabric softener can 126.

[0116] The detergent dispenser 115 is disposed abutting against the detergent can 117 and the fabric softener can 126. Therefore, when the detergent dispenser 115 is installed in the can storage box 114, the detergent dispenser 115 presses the detergent can 117 and the fabric softener can 126 backward. When the detergent can 117 is pressed backward, as... Figure 10 As shown, the detergent side cylinder 111b is inserted into the cylinder 123 provided in the outer frame 111a of the pump unit 111. This reliably prevents leakage of detergent liquid and the like from the detergent tank 117.

[0117] The fabric softener can 126 is also pressed backward by the detergent dispenser 115, thus reliably fitting into the can storage box 114. This reliably prevents leakage of fabric softener liquid from the fabric softener can 126.

[0118] In addition, such as Figure 3 As shown, the detergent dispenser 115 is a container with an open top surface and has a partition wall 115a. The partition wall 115a divides the storage section of the detergent dispenser 115 into a detergent storage section 115b and a fabric softener storage section 115c. Thus, the user can manually add powdered detergent to the detergent storage section 115b and fabric softener to the fabric softener storage section 115c.

[0119] The detergent dispenser 115 has a drain outlet (not shown) formed on its bottom surface. Liquid detergent flowing from the drain outlet is supplied to the sink 105 via the can collection box 114 and the connecting hose 129.

[0120] Additionally, when the powdered detergent added to the detergent collection section 115b is rinsed away, the controller will... Figure 11 The first water supply valve 110a shown is opened. Thus, tap water supplied from the faucet... Figure 11 Arrow A1 indicates that the water flows in the first water passage 181 and the water injection passage 116. Then, tap water is injected into the detergent storage section 115b of the detergent box 115 from the first upper water inlet 114e.

[0121] On the other hand, the fabric softener storage section 115c also includes a conventionally known siphon mechanism. Therefore, when the fabric softener liquid is allowed to flow into the fabric softener storage section 115c, the controller will... Figure 11 The second water supply valve 110b shown is opened. Thus, tap water flows... Figure 11 Arrow A3 indicates that the water flows in the third water channel 183. Then, tap water is injected into the fabric softener collection section 115c of the detergent dispenser 115 from the second upper water inlet 114f. By injecting water, the liquid level in the fabric softener collection section 115c rises. As a result, the fabric softener liquid added to the fabric softener collection section 115c does not remain in the fabric softener collection section 115c, but flows completely into the water tank 105 using the siphon effect generated by the siphon mechanism.

[0122] (Structure of the waterway)

[0123] like Figure 11 As shown, the first water path 181 forms the following water path: First, water flowing in from the first water supply valve 110a flows through the water supply passage 110c and the water injection passage 116. Then, water is injected into the detergent collection section 115b of the detergent box 115 from the first upper water inlet 114e. The first water path 181 branches off from the second water path 182 at a position upstream of the water injection passage 116.

[0124] The second water passage 182 forms a branch water passage 129a that flows into the connecting hose 129 via the three-way valve unit 113 and the pump unit 111. The second water passage 182 branches upstream of the three-way valve unit 113 such that the bypass water passage 184 is directed vertically downward. The bypass water passage 184 is connected to the lower water inlet 114g of the tank storage box 114.

[0125] Furthermore, due to blockage by foreign objects or aging, the opening and closing parts of the detergent-side three-way valve 113a may not close completely. In this case, there is a risk that the detergent liquid in the detergent tank 117 may flow back into the second water passage 182. However, in the water passage structure of this embodiment, the liquid that has flowed back into the second water passage 182 flows into the bypass water passage 184. Therefore, it is possible to reliably prevent the liquid from flowing back into the water tap.

[0126] In addition, the third water passage 183 constitutes the following water passage: First, tap water flowing in from the second water supply valve 110b flows in the water supply passage 110c and the water injection passage 116. Then, water is injected into the fabric softener storage section 115c of the detergent box 115 from the second upper water inlet 114f.

[0127] The waterways are constructed as described above.

[0128] [1-1-3. Structure of the Balance Detection Unit]

[0129] The following uses Figures 12-16 The structure of the liquid level detection unit of the washing machine in this embodiment will be explained.

[0130] Figure 12 This is an exploded perspective view of the detergent dispenser of the washing machine according to the above embodiment. Figure 13 This is a bottom-view perspective view of the detergent dispenser lid of the aforementioned washing machine, which has a float mechanism. Figure 14A This is a schematic side sectional view showing the remaining volume detection section of the washing machine described above. Figure 14B This is a schematic diagram of the lower surface of the detergent dispenser lid of the aforementioned washing machine, which has a float assembly. Figure 15This is a schematic side view of the detergent tank, showing the structure of the remaining detergent detection unit, with the detergent tank of the aforementioned washing machine filled with detergent liquid. Figure 16 This is a graph showing the relationship between the detection magnetic force of a linear Hall element and its output voltage.

[0131] The automatic liquid dispensing device 109 includes a first level detection unit 130 and a second level detection unit (not shown). The first level detection unit 130 detects the amount of liquid detergent in the detergent tank 117. The second level detection unit detects the amount of liquid detergent in the fabric softener tank 126. Hereinafter, without distinguishing between the first level detection unit 130 and the second level detection unit, they will be referred to simply as "level detection unit".

[0132] The first margin detection unit 130 is composed of a float unit 130a and a linear Hall element 136, as described below. The second margin detection unit is also constructed in the same way as the first margin detection unit 130, and therefore will not be described further.

[0133] (Float section 130a)

[0134] like Figure 6 and Figure 13 As shown, one end of the float part 130a is rotatably disposed on the lower surface of the detergent bottle cap 119.

[0135] like Figure 12 As shown, the float section 130a includes a connecting rod 133, a rotating shaft 131 located at the upper end of the connecting rod 133, and a magnet box 135 located at the lower end of the connecting rod 133. The rotating shaft 131 is rotatably mounted on the lower surface of the detergent dispenser cap 119 (see reference). Figure 13 ).

[0136] The interior of the magnet box 135 is hollow, forming a sealed container together with the cover 135a. A magnet 134 (magnetic body) is disposed inside the magnet box 135. The magnet 134 is enclosed in a sealed state by the magnet box 135 and the cover 135a. This prevents detergent liquid from seeping into and adhering to the magnet 134. Furthermore, the magnet box 135 has retaining ribs 135c formed inside to hold the magnet 134.

[0137] Furthermore, the magnet box 135 has a hollow internal structure, so it experiences buoyancy in the detergent solution. Therefore, the float section 130a is normally suspended above the surface of the detergent solution in the detergent tank 117. At this time, the rotation shaft 131 of the float section 130a changes according to the liquid level of the detergent solution... Figure 14A and Figure 15 Rotate in the up and down direction as indicated by arrow H.

[0138] Additionally, the magnet box 135 has below Figure 13The support portion 135b is shown. On the other hand, the detergent dispenser 117 includes a magnetic stop portion 137 formed on its bottom surface. With this structure, when the detergent liquid level in the detergent dispenser 117 drops, the float portion 130a rotates downwards, causing the support portion 135b to abut against the magnetic stop portion 137. This prevents the float portion 130a from rotating to a position lower than the magnetic stop portion 137.

[0139] In addition, such as Figure 13 , Figure 14A , Figure 14B and Figure 15 As shown, the detergent bottle cap 119 has a partition rib 119a on its lower surface. The partition rib 119a is provided around the rotation shaft 131 of the float part 130a. This prevents detergent liquid from seeping into the rotation shaft 131, thereby preventing adverse phenomena such as adhesion of the rotation shaft 131.

[0140] (Linear Hall element 136)

[0141] like Figure 4 and Figure 5 As shown, linear Hall elements 136 are respectively disposed on the lower part of the outer surface of the left and right side walls of the can storage box 114. The linear Hall element 136 outputs a voltage corresponding to the detected magnetic flux density. In addition, the linear Hall element 136 is an example of a magnetic force sensor.

[0142] Typically, the linear Hall element 136 has Figure 16 The characteristics shown. Additionally... Figure 16 The horizontal axis represents the magnetic force detected by the linear Hall element 136, and the vertical axis represents the output voltage value of the linear Hall element 136.

[0143] The linear Hall element 136 detects a magnetic force close to 0 (zero) Wb / m. 2 In this case, the output voltage is equivalent to half of the maximum voltage value Vdd(V), namely Vdd / 2(V). Additionally, the magnetic force is close to 0 (zero) Wb / m. 2 This refers to a state where the magnetic material is separated from the linear Hall element 136 to the point where the magnetic force of the magnetic material cannot be detected by the linear Hall element 136.

[0144] When a magnetic object with an N pole approaches the linear Hall element 136 from the aforementioned state, the linear Hall element 136 strongly detects the magnetic force of the N pole. Therefore, the output voltage of the linear Hall element 136 becomes greater than Vdd / 2. Consequently, as the detected magnetic force of the N pole increases, the output voltage shifts towards... Figure 16 The direction of arrow J increases.

[0145] On the other hand, when a magnetic object with a south pole approaches the linear Hall element 136, the linear Hall element 136 strongly detects the magnetic force of the south pole. Therefore, the output voltage of the linear Hall element 136 becomes less than Vdd / 2. Consequently, as the detected magnetic force of the south pole increases, the output voltage shifts towards... Figure 16 The arrow I decreases in direction.

[0146] In other words, with an N-pole magnetic body, the closer the linear Hall element 136 is to the magnet box 135, the higher the output voltage of the linear Hall element 136; the farther the linear Hall element 136 is from the magnet box 135, the lower the output voltage of the linear Hall element 136. On the other hand, with an S-pole magnetic body, the relationship between distance and output voltage is reversed.

[0147] Furthermore, as described above, the linear Hall element 136 is located on the lower part of the outer surface of the side wall of the detergent container 114. Therefore, when the detergent liquid level in the detergent container 117 drops, the linear Hall element 136 moves closer to the magnet box 135. As a result, the output voltage of the linear Hall element 136 changes, thereby detecting the detergent liquid level in the detergent container 117.

[0148] Furthermore, when the linear Hall element 136 is disposed on the outer side of the bottom surface of the detergent container 117, the detergent accumulates on the inner bottom surface of the detergent container 117, making it impossible to detect the decrease in detergent liquid within the detergent container 117 using the linear Hall element 136. However, by disposing of the linear Hall element 136 on the outer side wall of the container 114 as described above, the decrease in detergent liquid can be reliably detected because the detergent flows down along the inner surface of the side wall.

[0149] (Magnet stop part 137)

[0150] like Figure 14A and Figure 15 As shown, the aforementioned magnet stop 137 is provided on the inner bottom surface of the detergent container 117. The magnet stop 137 is configured to abut against the support portion 135b of the magnet box 135 when the detergent liquid level is determined to be insufficient.

[0151] Using the above structure, even if the predetermined amount of detergent liquid in the detergent tank 117 decreases further due to the liquid level being determined by the liquid level indicator, the magnet box 135 will not rotate further downwards. Therefore, the output voltage of the linear Hall element 136 remains unchanged, outputting the set output voltage value, which is the voltage near Vdd / 2.

[0152] [1-2. Actions and Functions]

[0153] The following explains the operation and function of the washing machine configured as described above.

[0154] [1-2-1. Washing Operation]

[0155] This describes the washing operation of the washing machine in this embodiment.

[0156] Typically, the washing machine 100 operates with washing, rinsing, spin-drying, and drying steps. The washing step involves soaking clothes in detergent water and removing dirt by rotating the drum 106. The rinsing step involves rinsing the clothes soaked in detergent water with water. The spin-drying step removes water from the clothes. The drying step supplies hot air to the drum 106 to dry the clothes inside.

[0157] First, before starting the washing machine's washing cycle, the user adds detergent to the detergent tank 117 and fabric softener to the fabric softener tank 126.

[0158] Specifically, when adding detergent to the detergent dispenser 117, the user opens the lid 114a and removes the detergent dispenser 117 from the dispenser case 114. Then, the user opens the detergent dispenser lid 119, adds detergent to the detergent dispenser 117, and places the detergent dispenser 117 back into the dispenser case 114. Alternatively, detergent can be added directly to the detergent dispenser 117 without removing it from the dispenser case 114.

[0159] Similarly, when refilling fabric softener into container 126, the user opens the lid 114a and removes container 126 from container storage box 114. Then, the user opens container lid 128, adds fabric softener into container 126, and places container 126 back into container storage box 114. Alternatively, fabric softener can be added directly to container 126 without removing it from container storage box 114.

[0160] Furthermore, in this embodiment, the washing machine lid 114a, detergent bottle lid 119, and fabric softener bottle lid 128 are configured to open and close simultaneously by rotating up and down using, for example, a hinge mechanism. Therefore, when the detergent bottle lid 119 and fabric softener bottle lid 128 are closed while in the open state, closing the lid 114a will also close the detergent bottle lid 119 and fabric softener bottle lid 128 simultaneously.

[0161] Next, when the washing begins, the user opens the cover 102 and puts clothes into the drum 106 through the clothes loading and unloading port 103.

[0162] Next, the user operates the operation display unit 104 to turn on the power switch and set various washing programs and conditions, such as washing, rinsing, and spin-drying. At this time, the washing programs that can be set are, for example, "wash only", "rinse only", and "spin only".

[0163] The following describes the operation of the "washing program".

[0164] In the "washing program", the controller performs the following steps in sequence: fabric quantity determination, water supply, washing, rinsing and dehydration.

[0165] First, in the fabric quantity determination step, the controller uses the fabric quantity determination unit to measure the torque current value when the slot rotation motor rotates repeatedly in the forward and reverse directions at a certain speed. The fabric quantity determination unit detects the amount of fabric inside the roller 106 based on the measured torque current value.

[0166] Next, the controller drives the pump unit 111 to automatically dispense the amount of detergent liquid calculated by the liquid dispensing unit into the drum 106 from the detergent tank 117.

[0167] Next, the controller opens the first water supply valve 110a and executes the water supply step of supplying tap water to the roller 106 in an amount corresponding to the detected amount of fabric.

[0168] After the water supply step is completed, the controller drives the tank rotation motor to rotate the drum 106. This performs a washing step that agitates the laundry inside the drum 106.

[0169] After the washing step is completed, the controller performs a spin-drying step, followed by a rinsing step.

[0170] Additionally, during the rinsing step, the controller opens the first water supply valve 110a to supply a predetermined amount of tap water into the water tank 105. Then, the controller drives the pump unit 111 to automatically supply the amount of fabric softener liquid calculated by the liquid dosage calculation unit from the fabric softener tank 126 into the water tank 105.

[0171] Next, after supplying detergent and fabric softener, the controller further supplies tap water to the water circuit, thereby flushing away any remaining detergent and fabric softener in the detergent tank 117, fabric softener tank 126, and water circuit. This prevents the detergent and fabric softener from sticking together in the detergent tank 117, fabric softener tank 126, and water circuit.

[0172] Then, after the rinsing step is completed, the controller performs the spin-drying step. This completes a series of washing programs.

[0173] [1-2-2. Water supply methods and liquid supply methods]

[0174] The following uses Figures 6 to 11 The water supply method and the method of supplying liquid to the water tank 105 are explained in detail.

[0175] First, tap water is supplied to the sink 105 during the washing process.

[0176] When supplying tap water, the controller opens the first water supply valve 110a and closes the second water supply valve 110b. Additionally, the controller de-energizes the detergent-side coil 113d, the fabric softener-side coil 113i, and the drive motor 112f. Therefore, tap water supplied from the tap via the water pipes, etc., is... Figure 11 The water flows in the first water channel 181 shown and is supplied to the water tank 105 via the tank storage box 114 and the connecting hose 129.

[0177] After water supply is completed, the controller supplies detergent liquid from detergent tank 117 to water tank 105. In this case, the controller energizes the detergent-side coil 113d and drive motor 112f, and de-energizes the fabric softener-side coil 113i. Thus, detergent tank 117 is connected to the suction water passage 112h of pump unit 111. At this time, as... Figure 10 As shown, the check valve 123b inside the cylinder 123 of the detergent tank 117 rotates rearward. Therefore, the detergent liquid inside the detergent tank 117 flows in the directions of arrows F and G within the through-hole 123a of the cylinder 123. Then, the detergent liquid... Figure 11 As shown, water flows into the suction channel 112h of the pump unit 111 via the detergent-side three-way valve 113a and the fabric softener-side three-way valve 113b.

[0178] Next, the controller drives the drive motor 112f of the piston pump unit 112, causing the piston 112e to reciprocate up and down within the cylinder 112d. As a result, the cylinder 112d is repeatedly in a state of negative pressure and positive pressure.

[0179] At this time, when the piston 112e moves upward, a negative pressure is created inside the cylinder 112d. Consequently, the suction-side check valve 164 moves upward, and the detergent liquid flows from the gap between the suction-side check valve 164 and the suction water passage 112h into the receiving portion 112c inside the cylinder 112d (see reference). Figure 9 The detergent solution flows into the cylinder 112d. On the other hand, when the piston 112e moves downwards, positive pressure is created inside the cylinder 112d. This causes the discharge-side check valve 165 to move downwards. Therefore, the detergent solution in the receiving section 112c inside the cylinder flows out... Figure 6As indicated by arrow B, the detergent solution is discharged directly downwards through the gap between the discharge check valve 165 and the inner wall 112j of the discharge water passage 112g towards the branch water passage 129a. The discharged detergent solution flows through the branch water passage 129a of the connecting hose 129 arranged in the vertical direction and is supplied to the water tank 105 (see reference). Figure 6 ).

[0180] By repeatedly moving the piston 112e up and down for a predetermined time as described above, a predetermined amount of detergent liquid is supplied to the water tank 105.

[0181] Here, the second water passage 182 is connected to the water tank 105. Normally, with the cover 102 open, the water tank 105 is exposed to the atmosphere. Therefore, there is a risk that the liquid may dry out, stick, and accumulate in the water passage from the piston pump unit 112 to the water tank 105.

[0182] Therefore, in the washing machine of this embodiment, the discharge water passage 112g of the piston pump unit 112 is connected to the branch water passage 129a of the connecting hose 129. Thus, the detergent liquid is discharged freely downwards towards the water tank 105 without passing through the water inlet passage 116 of the tank cassette 114 (see reference). Figure 6 (Arrow B). This shortens the distance of the water discharge path by 112g, and the water path remains uncomplicated. Therefore, it more effectively inhibits detergent liquid from adhering to the water path.

[0183] Next, after the detergent solution has been added, the controller de-energizes the detergent-side coil 113d and the fabric softener-side coil 113i. Simultaneously, the controller opens the first water supply valve 110a for a predetermined time (e.g., 10 seconds). This supplies tap water to the three-way valve unit 113 and the pump unit 111. Therefore, tap water can be used to flush away any detergent residue remaining in the connecting hose 129.

[0184] Furthermore, the water flow is usually weak at the start of water supply. Therefore, there is a potential problem: the suction-side check valve 164 and discharge-side check valve 165 of the piston pump unit 112 may not move sufficiently, thus obstructing the flow of supplied water. Therefore, in this embodiment, the structure can be configured such that after the detergent solution is added, the drive motor 112f of the piston pump unit 112 is driven for a predetermined time (e.g., 20 seconds) after the first water supply valve 110a is opened. Alternatively, the drive motor 112f of the piston pump unit 112 can be driven intermittently. Using this structure, the piston 112e of the piston pump unit 112 reciprocates, causing the receiving portion 112c inside the cylinder to repeatedly experience positive and negative pressure. This allows the suction-side check valve 164 and discharge-side check valve 165 to move sufficiently, allowing tap water to flow strongly into the pump unit 111. As a result, residual detergent liquid in the three-way valve unit 113, pump unit 111, and connecting hose 129 can be flushed away more reliably.

[0185] Furthermore, in the washing machine of this embodiment, the discharge water path 112g of the pump unit 111 is connected to the water tank 105 via the connecting hose 129 without passing through the tank storage box 114. Therefore, it is possible to prevent liquid residue from remaining and adhering in the water path from the pump unit 111 to the water tank 105.

[0186] On the other hand, when fabric softener liquid is supplied from the fabric softener tank 126, the controller energizes the fabric softener-side coil 113i and the drive motor 112f, and de-energizes the detergent-side coil 113d. Furthermore, since the method of supplying fabric softener liquid is the same as the method of supplying detergent liquid, it will not be described further.

[0187] Here, there is a potential risk of a gap being created in the opening and closing part of the detergent-side three-way valve 113a if a foreign object is stuck in it. In this case, if a power outage or water interruption occurs while the first water supply valve 110a is open, there is a risk that the detergent liquid in the detergent tank 117 may flow out through the gap in the opening and closing part of the detergent-side three-way valve 113a and backflow into the water tap in the second water passage 182.

[0188] Therefore, the second water passage 182 of the washing machine in this embodiment is provided with a bypass water passage 184 that branches downwards. Furthermore, the lower water inlet 114g, which serves as the outlet of the bypass water passage 184, is positioned below the detergent tank 117. Thus, detergent liquid flowing back from the detergent tank 117 via the detergent-side three-way valve 113a flows to... Figure 11The bypass water path 184, indicated by arrow A4, flows through the tank cassette 114 and connecting hose 129 to the sink 105. This prevents detergent liquid from flowing back into the water tap. Therefore, tap malfunctions due to backflow can be prevented in advance. In this case, the tap water flowing in the bypass water path 184 flows into the tank cassette 114. Therefore, during water supply, it can also be used to flush away detergent liquid adhering to the tank cassette 114.

[0189] In addition, if the fabric softener in the fabric softener container 126 flows back, the situation is the same as that of the detergent liquid, so it will not be described.

[0190] [1-2-3. Methods for manually adding detergent and fabric softener to the sink]

[0191] use Figure 3 and Figure 11 This describes the method of supplying powdered detergent and fabric softener to the sink 105 when the user has set the detergent to be manually added. This is for cases where the user has not set the automatic liquid detergent dispensing device 109.

[0192] First, when the controller supplies powdered detergent added to the detergent dispenser 115 to the water tank 105, it opens the first water supply valve 110a and simultaneously closes the second water supply valve 110b. At this time, tap water supplied from the faucet... Figure 11 As indicated by arrow A1, the water flows in the first water channel 181 and is injected from the first upper water inlet 114e toward the detergent collection section 115b of the detergent box 115. Thus, the powdered detergent in the detergent collection section 115b, together with the injected tap water, flows from the drain outlet 114c through the connecting hose 129 and is supplied to the water tank 105.

[0193] In addition, tap water supplied from the faucet, such as Figure 11 As indicated by arrows A2 and A4, water flows from the second water passage 182 into the bypass water passage 184, while water is supplied from the lower inlet 114g toward the inner bottom surface of the canister 114. Thus, water is supplied to the canister 114 from both the top and bottom. As a result, the powdered detergent added to the detergent collection section 115b does not remain in the canister 114 but is flushed away through the connecting hose 129.

[0194] On the other hand, when fabric softener is supplied to the sink 105 and placed in the fabric softener collection section 115c of the detergent dispenser 115, the controller closes the first water supply valve 110a and simultaneously opens the second water supply valve 110b. Thus, tap water supplied from the faucet... Figure 11Arrow A3 indicates that the water flows in the third water channel 183, and is injected from the second upper water inlet 114f toward the fabric softener collection section 115c of the detergent dispenser 115. This causes the liquid level in the fabric softener collection section 115c to rise. Then, the siphon effect generated by the siphon mechanism ensures that the added fabric softener solution does not remain in the fabric softener collection section 115c, but flows out into the canister 114. The fabric softener solution flowing into the canister 114 flows through the drain outlet 114c in the connecting hose 129 and is supplied to the water tank 105.

[0195] [1-2-4. Method for detecting the remaining liquid level in detergent or fabric softener containers]

[0196] The following uses Figure 17 The method for detecting the remaining amount of detergent liquid in detergent container 117 is explained. The method for detecting the remaining amount of fabric softener liquid in fabric softener container 126 is the same, and therefore will not be explained.

[0197] Figure 17 This is a graph showing the relationship between the number of times detergent is added to the washing machine according to the above embodiment and the output voltage of the linear Hall element. Additionally, Figure 17 The horizontal axis represents the number of times detergent solution is added to the water tank 105, and the vertical axis represents the output voltage of the linear Hall element 136. Additionally, Figure 17 The solid line a represents the change in output voltage when the magnetic body at the N pole approaches the linear Hall element 136, and the dashed line b represents the change in output voltage when the magnetic body at the S pole approaches the linear Hall element 136.

[0198] The following settings assume that the upper limit of the output voltage of the linear Hall element 136 is set to 5V, the lower limit is set to 0V, and the magnetic flux density is approximately 0 (zero) Wb / m. 2 The following explanation uses a setting where the output voltage of the linear Hall element 136 is 2.5V as an example. However, the upper limit of the linear Hall element 136 can also be, for example, 10V; it can be set arbitrarily as long as it does not impede detection accuracy.

[0199] First, with the detergent tank 117 filled with detergent liquid, as follows: Figure 15 As shown, the linear Hall element 136 is separated from the magnet 134 by a large distance. Therefore, the magnetic field lines from the magnet 134 do not reach the linear Hall element 136. Consequently, the linear Hall element 136... Figure 17 As shown in the K-interval, the output is equivalent to a magnetic flux density of approximately 0 (zero) Wb / m. 2 The voltage is 2.5V.

[0200] Then, along with the washing action, detergent solution is repeatedly added from the detergent tank 117 into the water tank 105. As a result, the amount of detergent solution in the detergent tank 117 decreases, and the detergent solution level drops.

[0201] As the detergent liquid level drops, the magnet box 135, which is suspended on the surface of the detergent liquid, also rotates downwards. Therefore, the magnet 134 (magnetic body) inside the magnet box 135 moves closer to the linear Hall element 136. Consequently, the amount of magnetic field lines (magnetic flux density) detected by the linear Hall element 136 increases.

[0202] At this time, when the linear Hall element 136 is subjected to the magnetism of the N pole by the magnet 134, such as Figure 17 As shown by solid line a, as the detergent liquid in the detergent tank 117 decreases, the output voltage of the linear Hall element 136 increases. Furthermore, when more detergent liquid is added, the magnet box 135 comes into contact with the magnet stop 137. Consequently, the output voltage of the linear Hall element 136 converges to a predetermined value (e.g., 4.0V).

[0203] On the other hand, when the linear Hall element 136 is magnetized by the S pole of the magnet 134, such as Figure 17 As shown by dashed line b, the output voltage of the linear Hall element 136 decreases as the detergent liquid in the detergent tank 117 decreases. Furthermore, when more detergent liquid is added, the magnet box 135 comes into contact with the magnet stop 137. Consequently, the output voltage of the linear Hall element 136 converges to a predetermined value (e.g., 1.0V).

[0204] As described above, when the remaining detergent liquid level falls below a predetermined value, the output voltage of the linear Hall element 136 converges to the predetermined value. Therefore, to determine the extent of detergent liquid deficiency in the detergent tank 117, it is preferable to calculate the difference between the output voltage of the linear Hall element 136 after detergent is added and the output voltage before detergent was added. In other words, if the difference is below the predetermined value, the controller determines that the remaining detergent liquid level is insufficient.

[0205] The remaining amount of detergent liquid in the detergent tank 117 is detected as described above.

[0206] The following uses Figure 18 This section explains how to determine if there is insufficient detergent liquid remaining in the detergent container.

[0207] Figure 18 This is a flowchart of a method for determining insufficient detergent liquid in a washing machine according to the above-described embodiments.

[0208] Here, the storage unit has at least a 0th storage unit, a 1st storage unit, a 2nd storage unit, and a 3rd storage unit. Specifically, the 0th storage unit is used to store the output voltage of the linear Hall element 136 after detergent is added. The 1st storage unit is used to store the output voltage of the linear Hall element 136 after the previous detergent addition. The 2nd storage unit is used to store the output voltage of the linear Hall element 136 after the second prior detergent addition. The 3rd storage unit is used to store the output voltage of the linear Hall element 136 after the third prior detergent addition.

[0209] From now on, the value stored in the 0th storage unit will be designated as Y, the value stored in the 1st storage unit as (Y-1), the value stored in the 2nd storage unit as (Y-2), and the value stored in the 3rd storage unit as (Y-3). Furthermore, the number of consecutive times the voltage difference between Y and (Y-3) after the addition of detergent is less than 0.1V will be designated as CNT.

[0210] like Figure 18 As shown, when the washing machine starts its washing cycle, the controller first determines whether the amount of detergent liquid required for the washing step has been added from the detergent tank 117 (step S0). If it is determined that detergent liquid has been added (yes in step S0), the controller stores the output voltage of the linear Hall element 136 in the zero storage unit (step S1).

[0211] Next, the controller determines whether the output voltage of the linear Hall element 136 is above a first predetermined value (e.g., 2.0V) and below a second predetermined value (e.g., 3.0V) (step S2). If the output voltage of the linear Hall element 136 is above the first predetermined value and below the second predetermined value (yes in step S2), it corresponds to the detergent tank 117 being full of detergent liquid. Therefore, the controller does not perform the detergent liquid remaining quantity detection operation, stores (Y-2) stored in the second storage unit in the third storage unit, stores the value of (Y-1) stored in the first storage unit in the second storage unit, and stores the value Y stored in the 0 storage unit in the first storage unit (step S8). Then, the controller ends the detergent liquid remaining quantity determination.

[0212] On the other hand, if the output voltage of the linear Hall element 136 is less than the first predetermined value or greater than the second predetermined value (No in step S2), the controller calculates the absolute value of the difference (Y-(Y-3)) between Y and the output voltage (Y-3) of the linear Hall element 136 after the third addition of detergent, and determines whether the value is greater than or equal to 0.1V (step S3).

[0213] At this point, if the absolute value of the difference (Y-(Y-3)) is 0.1V or higher (No in step S3), the controller determines that the detergent level is not insufficient because the float 130a rotates downwards. Then, the controller resets CNT to make CNT = 0 (step S5). Afterwards, (Y-2) stored in the second storage unit is stored in the third storage unit, the value of (Y-1) stored in the first storage unit is stored in the second storage unit, and the value Y stored in the zero storage unit is stored in the first storage unit (step S8). Then, the controller ends the determination of the detergent level.

[0214] On the other hand, if the absolute value of the difference (Y-(Y-3)) is less than 0.1V (as in step S3), the controller determines that the liquid level of the detergent in the detergent tank 117 has dropped. Then, the controller increments CNT by 1 (step S4).

[0215] Next, the controller determines whether CNT is 3 or more (step S6). If CNT is less than 3 (No in step S6), the controller stores (Y-2) stored in the second storage unit in the third storage unit, stores (Y-1) stored in the first storage unit in the second storage unit, and stores the value Y stored in the zero storage unit in the first storage unit (step S8). Then, the controller ends the determination of the remaining detergent liquid.

[0216] On the other hand, if CNT is 3 or higher (as in step S6), the controller determines that the remaining detergent in the detergent dispenser 117 is less than a predetermined value. Then, the controller notifies the user by displaying on the operation display unit 104 that the remaining detergent is less than the predetermined value (step S7). Afterwards, the controller stores (Y-2) stored in the second storage unit in the third storage unit, stores the value (Y-1) stored in the first storage unit in the second storage unit, and stores the value Y stored in the zero storage unit in the first storage unit (step S8). Then, the controller ends the detergent level determination process.

[0217] Perform the judgment action that the detergent liquid is insufficient as described above.

[0218] Here, with the detergent dispenser 117 fully filled with detergent liquid, the linear Hall element 136 is separated from the magnet 134 (magnetic body) by a large distance. Therefore, even if more detergent is added to the detergent dispenser 117, the output voltage of the linear Hall element 136 remains constant at approximately 2.5V (equivalent to...). Figure 17 (K range). In this case, even when the detergent tank 117 is full of detergent liquid, the absolute value of the difference (Y-(Y-3)) is less than 0.1V. That is to say, there is a risk that the controller may falsely detect that the detergent liquid is insufficient. Therefore, in this embodiment, as Figure 18 As shown, the controller is configured such that when the output voltage Y of the linear Hall element 136 is above a first predetermined value and below a second predetermined value (as in step S2), it does not perform the operation of detecting the remaining amount of detergent liquid. This prevents false detection of insufficient detergent liquid in the aforementioned situation.

[0219] Furthermore, when the magnet 134 acting on the linear Hall element 136 is at its S pole, the output voltage of the linear Hall element 136 becomes as follows: Figure 17 The waveform is shown by the dashed line b. Therefore, in cases where, for example, the linear Hall element 136 is subjected to the S pole of magnetism and Y = 1.0V and (Y-3) = 1.2V, the difference (Y-(Y-3)) becomes -0.2V, which is therefore a value smaller than the judgment value of 0.1V. This presents a potential problem: even if the detergent tank 117 is full of detergent, the controller may still mistakenly detect that the detergent level is insufficient.

[0220] Therefore, to prevent the aforementioned false detections, it is set to be in Figure 18 The structure in step S3 compares the absolute value of the difference (Y-(Y-3)) with 0.1V. This prevents false detections caused by the polarity of the magnet 134.

[0221] Furthermore, the magnet case 135 can be manufactured without considering the directionality of the magnet 134's magnetism. Therefore, the manufacturing time required for the magnet case 135, as well as the time required for inspection and verification, can be reduced. This helps to curb the manufacturing cost of the magnet case 135.

[0222] It can detect insufficient detergent solution as described above.

[0223] The following example illustrates a method for detecting insufficient detergent solution after (N-1) repeated additions of detergent.

[0224] (The Nth time detergent is added)

[0225] First, the output voltage Y of the linear Hall element 136 after the Nth detergent addition is set to approximately 4.0V. Additionally, the value (Y-3) stored in the third storage unit is set to approximately 3.8V.

[0226] At this point, the absolute value of the difference (Y-(Y-3)) becomes 0.2V. That is, the absolute value of the difference is greater than the judgment value of 0.1V in step 3 (equivalent to...). Figure 18 (No to step S3). Therefore, in Figure 18In step S5, CNT is reset to 0. Then, in step S8, the controller stores the value (Y-2) of the second storage unit to the third storage unit, stores the value (Y-1) of the first storage unit to the second storage unit, and stores the value Y of the 0 storage unit to the first storage unit.

[0227] (Detergent addition for the (N+1)th time)

[0228] Next, the output voltage of the linear Hall element 136 after the (N+1)th detergent addition is set to approximately 4.02V, and the value (Y-3) stored in the third storage unit is set to 3.94V.

[0229] At this point, the absolute value of the difference (Y-(Y-3)) becomes 0.08V. That is, the absolute value of the difference is less than the judgment value of 0.1V in step 3 (equivalent to...). Figure 18 (Step S3 is...). Therefore, in step S4, CNT is incremented by 1 (CNT = 1). Then, in step S6, the controller determines whether CNT is greater than or equal to 3.

[0230] Since CNT is 1, the controller determines that the detergent liquid level is not insufficient. Then, in step S8, the controller stores the value (Y-2) of the second storage unit into the third storage unit, stores the value (Y-1) of the first storage unit into the second storage unit, and stores the value Y of the 0th storage unit into the first storage unit.

[0231] With the above values ​​stored in each storage unit, the controller remains in standby mode until the next supply of detergent liquid from the detergent tank 117.

[0232] (Detergent addition for the (N+2)th time)

[0233] Next, the output voltage of the linear Hall element 136 after the (N+1)th detergent addition is set to approximately 4.03V, and the value (Y-3) stored in the third storage unit is set to approximately 3.95V.

[0234] At this point, the absolute value of the difference (Y-(Y-3)) is 0.08V. That is, the absolute value of the difference is less than the judgment value of 0.1V in step S3. Therefore, in step S4, CNT is further incremented by 1 to become 2.

[0235] In this case, CNT is 2, which is also less than the judgment value of 3. Therefore, the controller determines that the remaining amount of detergent liquid is not insufficient. Then, in step S8, the controller stores the value (Y-2) of the second storage unit into the third storage unit, stores the value (Y-1) of the first storage unit into the second storage unit, and stores the value Y of the 0 storage unit into the first storage unit.

[0236] With the above values ​​stored in each storage unit, the controller remains in standby mode until the next supply of detergent liquid from the detergent tank 117.

[0237] (Detergent addition for the (N+3)th time)

[0238] Next, the output voltage of the linear Hall element 136 after the (N+2)th detergent addition is set to approximately 4.05V, and the value (Y-3) stored in the third storage unit is set to approximately 3.99V.

[0239] At this point, the absolute value of the difference (Y-(Y-3)) is 0.06V. That is, the absolute value of the difference is less than the judgment value of 0.1V in step S3. Therefore, in step S4, CNT is further incremented by 1 to become 3.

[0240] At this time, since CNT is 3, the controller determines that the amount of detergent in the detergent tank 117 has become less than the predetermined amount. Then, the controller causes the operation display unit 104 to display a message indicating that the detergent liquid is low, thus informing the user.

[0241] When the user receives a low detergent level message, they remove the detergent bottle 117 from the storage compartment of the bottle holder 114 and replenish the detergent in the bottle 117. This causes the detergent level in the bottle 117 to rise, rotating the float 130a upwards. In this state, the detergent bottle 117 is then reinstalled in the storage compartment of the bottle holder 114. At this time, because the distance between the magnet 134 and the linear Hall element 136 increases, the output voltage of the linear Hall element 136 approaches 2.5V. Therefore, the controller determines that detergent has been replenished into the bottle 117. Then, the low detergent level message on the operation display unit 104 is canceled.

[0242] As described above, in this embodiment, the difference between the output voltage of the linear Hall element 136 after the detergent solution is added and the output voltage of the linear Hall element 136 when the detergent solution is added for the predetermined number of times (e.g., the third time) is added is first calculated.

[0243] If the absolute value of the calculated difference is less than a predetermined value (e.g., 0.1V) multiple times (e.g., three times) consecutively, the controller determines that the detergent liquid in the detergent tank 117 has become less than the predetermined amount.

[0244] In other words, the controller determines the remaining detergent level based on the absolute value of the difference between the output voltage of the linear Hall element 136 after detergent is added and the output voltage of the linear Hall element 136 before addition. This reduces the possibility of false detections that could lead to insufficient detergent levels due to imbalances in the washing machine's construction, such as the configuration of the linear Hall element 136 or the size of the equipment.

[0245] In addition, such as Figure 13 , Figure 14A and Figure 14B As shown, a partition wall rib 119a is formed on the lower surface of the detergent can lid 119 in a manner that surrounds the rotation axis 131 of the float portion 130a. Therefore, as Figure 15 As shown, even when the detergent solution in the detergent tank 117 is filled to the vicinity of the detergent tank lid 119, an air accumulation area exists inside the region surrounded by the partition wall ribs 119a. Therefore, detergent solution will not flow into the partition wall ribs 119a. This prevents detergent solution from adhering to the rotating shaft 131 of the float section 130a. Moreover, even when the detergent tank lid 119 is tilted with the lid removed from the detergent tank 117, the partition wall ribs 119a act as a barrier, preventing liquid adhering to the lower surface of the detergent tank lid 119 from flowing to the rotating shaft 131. This prevents malfunction of the rotating shaft 131 due to detergent solution adhesion. As a result, the decrease in the measurement accuracy of the remaining detergent solution can be suppressed, thereby maintaining a high measurement accuracy stably over a long period.

[0246] Furthermore, a magnetic stop 137 is provided on the inner bottom surface of the detergent dispenser 117. When the detergent level is determined to be insufficient, the magnetic stop 137 abuts against the magnet box 135. Therefore, even if more detergent is discharged when the detergent level is already low, further downward rotation of the float 130a is prevented. Consequently, the output voltage of the linear Hall element 136 remains unchanged when the detergent level is low. As a result, the linear Hall element 136 is prevented from falsely detecting that the detergent level is not low.

[0247] [1-3. Effects, etc.]

[0248] As described above, the washing machine of this embodiment is configured such that the liquid discharged from the pump unit 111 flows downward through the drain water passage 112g, which is arranged vertically downward from the drum body 112d, and is supplied to the water tank 105. This suppresses the residue and adhesion of detergent in the water passage from the pump unit 111 to the water tank 105. Furthermore, the drain water passage 112g is connected to a connecting hose 129 that supplies a large volume of water. This also suppresses detergent residue in the water passage leading to the water tank 105. In addition, after detergent solution is added, the first water supply valve 110a is opened to supply water. This further suppresses detergent residue in the pump unit 111 and the first water passage 181.

[0249] Furthermore, a suction water passage 112h and a discharge water passage 112g are provided at the lower part of the tank 112d. A suction-side check valve 164 and a discharge-side check valve 165 are respectively installed in the suction water passage 112h and the discharge water passage 112g. Therefore, after the detergent liquid is discharged, detergent liquid remains in the tank 112d. This inhibits the drying of the detergent liquid within the tank 112d. As a result, the adhesion of the detergent liquid within the tank 112d can be suppressed.

[0250] Another configuration involves supplying detergent solution from detergent tank 117 into water tank 105, and then opening the water supply valve at a predetermined time to supply tap water. This allows tap water to flush away any detergent solution remaining in the drain path 112g.

[0251] Furthermore, after the detergent solution in the detergent tank 117 is supplied to the water tank 105, the pump unit 111 is driven for a predetermined time after the water supply valve is opened. Therefore, even when the water flow is weak at the beginning of water supply, the driving force of the piston pump unit 112 can be used to increase the water flow. Thus, the rotation of the suction-side check valve 164 and the discharge-side check valve 165 can easily flush away any detergent solution remaining in the water path from the pump unit 111 to the water tank 105.

[0252] Furthermore, this embodiment uses a front-loading washing machine as an example, but the invention is not limited thereto. For example, it also achieves the same function and effect in a top-loading washing machine.

[0253] Furthermore, in this embodiment, an example of determining the insufficient amount of detergent liquid is given by comparing the absolute value of the difference between Y and (Y-3) with a predetermined value, but the present invention is not limited to this. For example, a structure that compares the absolute value of the difference between Y and (Y-1) with a predetermined value may also be used. Additionally, a structure may be used where, for example, the output voltage of the linear Hall element 136 after the fourth addition of detergent is set to (Y-4), and the absolute value of the difference between Y and (Y-4) is compared with a predetermined value. These structures can achieve the same function and effect.

[0254] As described above, the washing machine of the present invention includes: a housing; a water tank supported within the housing; a washing tub rotatably disposed within the water tank; and a can storage box located above the water tank, having a storage portion. The washing machine also includes: a can disposed within the storage portion of the can storage box for storing liquid; and an automatic liquid dispensing device that automatically supplies the liquid from the can into the washing tub. The automatic liquid dispensing device has a pump unit for drawing and discharging the liquid from the can, and the liquid discharged from the pump unit is configured to fall freely and be supplied to the water tank. This prevents the liquid discharged from the pump unit from adhering to and sticking to the water path until it is supplied to the water tank.

[0255] Alternatively, the washing machine of the present invention may include: a detergent dispenser disposed in a storage section of a canister for storing manually dispensed powdered detergent; a drain outlet formed at the bottom of the canister; and a connecting hose connecting the drain outlet to the sink. The connecting hose is connected to a branch water passage configured to connect to the discharge water passage of the pump unit. Thus, the liquid detergent discharged from the pump unit merges with the connecting hose supplying a large volume of water. Therefore, it is possible to prevent the liquid detergent from adhering to the water passage until it flows into the sink.

[0256] Alternatively, the washing machine of the present invention may include: a water supply valve disposed in the housing for controlling the supply of tap water; and a water passage connecting the pump unit and the water supply valve. Furthermore, the water supply valve is configured to open at a predetermined time after the liquid detergent in the tank is supplied to the water tank. Therefore, each time the liquid detergent in the tank is added to the water tank, the water passage supplying the detergent is rinsed. As a result, it is possible to more reliably prevent detergent from adhering to the water passage.

[0257] Alternatively, the washing machine of the present invention may have a pump unit configured to be driven for a predetermined time after the liquid in the tank is supplied to the water tank, starting from when the water supply valve is opened. Thus, even when the water pressure is low, such as at the beginning of water supply, the driving force of the piston pump can be used to increase the water pressure. As a result, any liquid remaining in the water passages can be easily flushed away.

[0258] Alternatively, the washing machine of the present invention may have a water supply valve configured to open and close intermittently at predetermined intervals after the liquid in the tank is supplied to the water tank. This allows for more reliable flushing away of any remaining liquid in the water path.

[0259] Industrial availability

[0260] The washing machine of the present invention can supply detergent liquid to the water tank without passing through the drain line (pipe, rubber hose, etc.), detergent container section, etc. Therefore, it is useful in applications such as washing machines where it is desirable to eliminate detergent liquid residue that adheres to the drain line.

[0261] Explanation of reference numerals in the attached figures

[0262] 100. Washing machine; 101. Housing; 102, 114a. Cover; 103. Clothes loading and unloading port; 104. Operation display unit; 105. Water tank; 106. Drum (washing tub); 106a. Baffle; 109. Automatic liquid dispensing device; 110. Water supply unit; 110a. First water supply valve; 110b. Second water supply valve; 110c. Water supply passage; 111. Pump unit; 111a. Outer frame; 111b. Detergent side drum; 111c, 117f. Liner; 111e. Protruding rib; 111f. Fabric softener side drum; 112. Piston pump unit; 112a. Connecting rod; 112b. Cam; 112c. Storage section; 112d. Tub body; 112e 112f, Piston; 112g, Drive motor; 112h, Discharge water passage; 112i, 112j, Inner wall surface; 113, Three-way valve unit; 113a, Detergent-side three-way valve; 113b, Fabric softener-side three-way valve; 113c, Detergent-side spring; 113d, Detergent-side coil; 113e, Detergent-side plunger; 113f, Detergent-side valve core; 113h, Fabric softener-side spring; 113i, Fabric softener-side coil; 113j, Fabric softener-side plunger; 113k, Fabric softener-side valve core; 113l, Detergent-side cylinder; 113m, Fabric softener-side cylinder; 114, Can storage box; 114b, Opening; 114c, Drain outlet; 114d, Insertion hole; 114e, Upper part of the first section. 114f, Second upper water inlet; 114g, Lower water inlet; 115, Detergent container; 115a, Divider wall; 115b, Detergent storage section; 115c, Fabric softener storage section; 116, Water inlet channel; 117, Detergent can (can); 117a, Rear wall; 117b, Protrusion; 117d, First rib; 117e, Second rib; 117g, Handle; 118, Upper surface opening; 119, Detergent can lid; 119a, Divider wall rib; 120, Bottom surface; 121, Hook; 121a, Upright part; 121b, Extension; 122, Mesh member; 122a, 123a, Through hole; 122b, Engaging rib; 122c, 164a, 165a, Protrusion; 122d, Lower end; 122e, Engaging claw; 123, Cylinder; 123b, Check valve; 124, Water passage; 126, Softener container; 128, Softener container cap; 129, Connecting hose; 129a, Branch water passage; 130, Balance detection unit; 130a, Float unit; 131, Rotating shaft; 133, Connecting rod; 134, Magnet; 135, Magnet box; 135a, Cover; 135b, Support; 135c, Holding rib; 136, Linear Hall element (magnetic sensor); 137, Magnet stop; 163, Damper; 164, Intake side check valve; 164b, 165b, Spring; 165, Discharge side check valve; 181, First water passage; 182, Second water passage;183. Third waterway; 184. Bypass waterway.

Claims

1. A washing machine, wherein, The washing machine includes: case; The water tank is supported within the housing; A washing tub, which is rotatably disposed within the water tank; A can storage box, located above the water tank, has a storage section; The first and second cans are disposed in the storage section of the can storage box and are used to store liquids; An automatic liquid dispensing device has a pump unit for attracting and discharging the liquid in the first tank or the second tank, and automatically supplies the liquid in the first tank or the second tank into the washing tank; A connecting hose connects the can storage box and the water tank; A branch water passage connects the discharge water passage of the pump unit to the connecting hose; A water supply valve, located in the housing, is used to control the supply of tap water; and The water circuit connects the pump unit and the water supply valve. The path, including the portion of the connecting hose and the branch water passage, connects the discharge water passage of the pump unit and the water tank, and this path is configured to extend in a generally vertical direction. The water supply valve is configured to open at a predetermined time after the liquid from the first tank or the second tank is supplied to the water tank. In the water circuit, a three-way valve unit is provided upstream of the pump unit. The three-way valve unit selectively discharges the liquid from the first tank and the second tank to the pump unit. The three-way valve unit includes a first three-way valve and a second three-way valve corresponding to the first tank and the second tank, respectively. The first three-way valve and the second three-way valve are arranged along the water circuit and selectively switch the tap water in the water circuit and the liquid in the first tank or the second tank, respectively, and selectively supply the tap water and the liquid towards the pump unit. A bypass water circuit connected to the tank storage box is branched upstream of the three-way valve unit.

2. The washing machine according to claim 1, wherein, The pump unit is configured to operate for a predetermined time after the liquid agent in the first tank or the second tank is supplied to the water tank, starting from when the water supply valve is opened. The first can is a detergent can, the second can is a fabric softener can, the first three-way valve is a detergent-side three-way valve, and the second three-way valve is a fabric softener-side three-way valve.

3. The washing machine according to claim 1, wherein, The water supply valve is configured to intermittently open and close at predetermined intervals after the liquid from the first tank or the second tank is supplied to the water tank. The first can is a detergent can, the second can is a fabric softener can, the first three-way valve is a detergent-side three-way valve, and the second three-way valve is a fabric softener-side three-way valve.

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