JP7327374B2 - Dishwasher, Dishwashing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dishwasher and a dishwashing method capable of correctly detecting whether or not a washing nozzle is rotating and not deteriorating washing performance.

2. Description of the Related Art In a dishwasher that performs washing by means of a rotatable washing nozzle, the washing nozzle is generally designed to rotate due to the reaction force of sprayed washing water. However, when tableware such as chopsticks and forks protrudes from the dish basket and is stored, the tableware touches the washing nozzle and hinders the rotation of the washing nozzle, thereby deteriorating the washing performance.

In order to solve this problem, in Patent Document 1, a side wall of a cylindrical communicating portion fixed to a washing tank is provided with a rotating shaft for supplying water supplied from a washing pump into the washing nozzle. A pair of first openings and a pair of second openings having an opening area smaller than that of the first openings are formed symmetrically with respect to the rotation axis, and the first openings and the second openings are centered about the rotation axis. are arranged at intervals of 90° on the circumference of . That is, when the throttle member is positioned in front of the first opening, the throttled amount of water is larger than when the throttle member is positioned in front of the second opening, so the amount of water sprayed from the washing nozzle is also rotatable. A configuration is disclosed that utilizes the change in response to determine whether or not the cleaning nozzle is rotating normally. In addition, when the rotation is not normal, the notification means is notified to urge the user to take some measures.

Japanese Patent No. 5269702

However, in such a configuration, since the amount of water sprayed from the washing nozzle changes depending on the position of the throttle member, a large amount of washing water is applied to the dishes placed at the specific position, and the washing water to the dishes placed at the specific position is large. Washing unevenness occurs depending on the arrangement, such as less washing water. Even if the type of tableware to be placed is adjusted by devising a dish basket, the user may place the tableware regardless of the type of tableware, resulting in uneven washing.

The present disclosure has been made to solve such problems, and provides a dishwasher capable of correctly detecting a malfunction of a washing nozzle without depending on the arrangement of dishes and without deteriorating washing performance. It is an object.

A dishwasher includes a washing tank for containing tableware, a rotatable washing nozzle arranged in the washing tank for injecting water, a washing pump for supplying water, a washing pump and a washing nozzle. and a cylindrical communicating portion for supplying water supplied from the cleaning pump to the cleaning nozzle; , a first opening, a second opening having the same opening area as the first opening, and a shutter for opening and closing the first opening are provided at a side surface of the communication portion facing the diaphragm member when the cleaning nozzle rotates, and the shutter is , the opening degree of the first opening is changed according to the amount of water from the washing pump.

Further, a third opening and a fourth opening having an opening area smaller than that of the third opening are provided on the side surface of the communicating portion at a position facing the diaphragm member when the cleaning nozzle rotates, and the diaphragm member is provided with a diaphragm opening and a diaphragm opening. A shutter that opens and closes is provided, and the shutter changes the opening of the diaphragm opening according to the amount of water from the washing pump.

According to the present disclosure, it is possible to detect whether or not the washing nozzle is rotating normally, and to prevent uneven washing from occurring due to the arrangement of the dishes in the washing tank.

2 is an internal view of the dishwasher 10 according to Embodiment 1. FIG. 3 is a cross-sectional view of the cleaning nozzle 24 in the vicinity of the rotating shaft; FIG. It is the figure which looked at the washing nozzle 24 from the upper surface. It is the figure which looked at the washing nozzle 24 from the upper surface. 3 is a detailed configuration diagram showing the relationship between a shutter 60 and a communicating portion 25a; FIG. 3 is a detailed configuration diagram showing the relationship between a shutter 60 and a communicating portion 25a; FIG. FIG. 10 is a state diagram when the washing motor is operating at the number of revolutions L; FIG. 10 is a state diagram when the cleaning motor is operating at the number of revolutions L; It is a figure which shows the electric current value which flows through a washing|cleaning motor. It is a figure which shows the electric current value which flows through a washing|cleaning motor. FIG. 10 is a state diagram when the washing motor is operating at the number of revolutions H; FIG. 10 is a state diagram when the washing motor is operating at the number of revolutions H; It is a figure which shows the electric current value which flows through a washing|cleaning motor. It is a flow chart which shows tableware washing operation. It is a flow chart which shows washing process S2. It is a flow chart which shows tableware washing operation. FIG. 11 is a configuration diagram showing the configuration of a communicating portion 25a according to Embodiment 2; FIG. 10 is a state diagram when the washing motor is operating at the number of revolutions L1; FIG. 10 is a state diagram when the washing motor is operating at the number of revolutions L1; It is a figure which shows the electric current value which flows through a washing|cleaning motor. It is a figure which shows the electric current value which flows through a washing|cleaning motor. FIG. 10 is a state diagram when the cleaning motor is operating at the number of revolutions H1; FIG. 10 is a state diagram when the cleaning motor is operating at the number of revolutions H1;

Hereinafter, embodiments will be described with reference to the drawings. It should be noted that the invention is not limited by this embodiment. Moreover, although a drawer-type dishwasher is used as an example of a dishwasher, the present invention is not limited to a drawer-type dishwasher.

Embodiment 1.
FIG. 1 is an internal view of the dishwasher 10 according to Embodiment 1. FIG. The dishwasher 10 is of a drawer type, and has a box-shaped washing machine main body 12 having a front opening 12a on the front surface, a tableware storage opening 20a that can be stored in the storage space of the washing machine main body 12, and a tableware storage opening 20a above. and a cleaning tank 20 having a lid body 18 for closing. Inside the washing tank 20, a tableware basket 40 for placing tableware 98 and the like is removably provided.

The washing machine main body 12 is moved forward (to the left in FIG. 1) and backward (to the right in FIG. 1) by the user by means of a slide mechanism (rail structure) to open and close the washing tank 20 .
Further, inside the washing machine main body 12, there are provided a water supply pipe 31, a water supply valve 14, a water supply mechanism 33, a water supply mechanism 52, and a water supply mechanism 33, which are water supply means for supplying tap water as washing water into the washing tank 20. It is provided with a pipe 53, and a blower 15 and an air passage 17 which are drying means for generating drying air for drying the tableware 98. In addition, the blower 15 is built in the casing 81 . Also, the air blown from the blower 15 is discharged outside the refrigerator through the exhaust port.

The water supply valve 14 is provided on the downstream side of the water supply pipe 31, and the water supplied to the water supply pipe 31 passes through the water supply valve 14, the water supply connection pipe 37, the body side water supply connector 34 which is the water supply mechanism 33, and the washing tank side water supply. Water is supplied into the washing tank 20 from a water supply connection pipe 43 via a connector 35 . The water supply mechanism 33 is configured to supply water to the cleaning tank 20 by connecting a body side water supply connector 34 and a cleaning tank side water supply connector 35 respectively.

The cleaning tank 20 has a cleaning pump 22 , a cleaning nozzle 24 , a heater 26 and a drainage pump 51 . The cleaning pump 22 has an impeller, and the impeller is rotated by a built-in electric motor (hereinafter referred to as cleaning motor). Also, the cleaning pump 22 communicates with the bottom portion 20 b of the cleaning tank 20 via the suction flow path 21 . A water level detection device 49 detects the water level in the cleaning tank 20, and the amount of water supply is adjusted by detecting the water level.

Water supplied from the water supply pipe 31 to the cleaning tank 20 through the water supply valve 14 is accumulated in the bottom portion 20 b of the cleaning tank 20 and heated by the heater 26 . By rotating the impeller in one direction, the cleaning pump 22 sucks water from the bottom 20 b of the cleaning tank 20 through the suction flow path 21 and supplies the water to the cleaning nozzle 24 . Also, the washing motor operates by controlling the rotation speed, and by converting and calculating the current value flowing through the washing motor, the load of the washing motor, that is, the load of the washing pump 22 is detected, and the detected value is sent to the control unit 38. Output.

Like the cleaning pump 22, the drainage pump 51 also has an impeller, and the impeller is rotated by a built-in electric motor (hereinafter referred to as a drainage motor). The washing water pressurized by the drainage pump 51 is discharged through the drainage connection pipe 57, the cleaning tank side drainage connector 54 and the main body side drainage connector 55 which are the drainage mechanism 52, the drainage connection pipe 58, and the drainage trap 56. It is configured to be able to drain water to the pipe 53 .

An input section 32 , an alarm device 36 and a control section 38 are provided in front of the cleaning tank 20 . The input unit 32 includes a power switch 32a operated by the user to switch the power of the dishwasher 10 on/off, and a start switch 32b operated by the user to start the dishwashing process. Also serves as a temporary stop switch that is operated when temporarily stopping the dishwashing process). When the switches 32a and 32b are operated, signals are input to the controller 38 from the switches 32a and 32b. The notification device 36 is connected to the control section 38 and notifies the user by display and sound based on instructions from the control section 38 .

Next, the configuration of the cleaning nozzle 24 will be described with reference to FIGS. 2, 3, and 4. FIG. 2 is a cross-sectional view of the cleaning nozzle 24 in the vicinity of the rotating shaft. 3 and 4 are top views of the cleaning nozzle 24, and are partially transparent for explanation.

The cleaning nozzle 24 includes a central nozzle 24a and a rotating nozzle 24b, and is rotatable about a vertical axis A (hereinafter referred to as rotation axis A). The central nozzle 24a extends along the rotation axis A in a cylindrical shape having an internal space 50. As shown in FIG. The rotary nozzle 24b consists of an upper plate 44 and a lower plate 46, which are joined together to form an internal space 48 extending along an axis B perpendicular to the axis A. As shown in FIG. A central nozzle 24a is connected to the upper plate 44 in the vicinity of the rotation axis A, and an internal space 50 of the central nozzle 24a communicates with an internal space 48 of the rotary nozzle 24b.

A communicating portion 25 a that communicates with the channel 25 through which water supplied from the washing pump 22 flows enters the internal space 48 from the central portion of the lower plate 46 . The communication portion 25 a has a cylindrical shape, the center line of which extends along the rotation axis A, and is fixed to the cleaning tank 20 .

A first opening 42a and a second opening 42b for supplying water supplied from the washing pump 22 into the washing nozzle 24 are formed in a side wall of the communicating portion 25a. The first openings 42a are a set of openings arranged symmetrically with respect to the rotation axis A, and the second openings 42b are a set of openings arranged at intervals of 90° from the first openings 42a. The first opening 42a and the second opening 42b are arranged at intervals of 90° on a circumference around the rotation axis A. As shown in FIG. Further, the communication portion 25a is provided with a shutter 60 that opens and closes the first opening 42a according to the strength of the water pressure of the water supplied from the washing pump 22. As shown in FIG.

5 and 6 are detailed configuration diagrams showing the relationship between the shutter 60 and the communicating portion 25a. The shutter 60 is composed of a shaft portion 61 upward and a shielding plate portion 62 extending downward from the shaft portion 61 . The communicating portion 25 a also has a shaft fixing portion 63 located above the first opening 42 a , and the shaft portion 61 is supported via this shaft fixing portion 63 . The shielding plate portion 62 has substantially the same size as the first opening 42a. Further, as shown in FIG. 6, the opening area of the first opening 42a and the opening of the second opening 42b when the shutter 60 is positioned at 90° with respect to the first opening 42a and the first opening 42a is fully opened. The areas are approximately equal. When water is not supplied from the first opening 42a, the shield plate portion 62 closes the first opening 42a due to its own weight.

On the lower plate 46, a diaphragm member 27, which is a plate-like member slightly larger than the opening area of the second opening 42b and extends vertically from the lower plate 46 so as to surround a part of the side wall of the communicating portion 25a, is a rotating shaft. It is provided symmetrically with respect to A. The diaphragm member 27 may be formed integrally with the lower plate 46 or may be a separate member from the lower plate 46 and fixed to the lower plate 46 . As a result, on the circumference around the rotation axis A, there are a portion where the diaphragm member 27 is formed and a portion where the diaphragm member 27 is not formed.

A plurality of injection ports 30 for injecting water supplied from the washing pump 22 are formed in the central nozzle 24a and the rotary nozzle 24b. The injection port 30 of the rotating nozzle 24b faces obliquely upward so as to inject water obliquely upward. Therefore, part of the water supplied from the washing pump 22 to the washing nozzle 24 via the first opening 42a and the second opening 42b of the communicating portion 25a passes through the inner space 48 of the rotary nozzle 24b. When sprayed from the spray port 30 formed in the upper plate 44, the washing nozzle 24 rotates around the rotation axis A because it gives a reaction force in the direction of rotation. In addition, the injection port 30 formed in the central nozzle 24a faces the horizontal direction. Therefore, the rest of the water supplied from the washing pump 22 to the washing nozzle 24 passes through the inner space 50 of the central nozzle 24a and is horizontally sprayed from the injection port 30 formed in the central nozzle 24a. It should be noted that the internal spaces 48, 50 can be referred to as channels 48, 50 for the passage of water.

When the cleaning nozzle 24 rotates around the rotation axis A, the throttle member 27 rotates around the communicating portion 25a. At this time, a first state (state shown in FIG. 3) in which the diaphragm member 27 faces the first opening 42a, a second state (state in FIG. 4) in which the diaphragm member 27 faces the second opening 42b, are alternately repeated.

Since the shaft portion 61 of the shutter 60 is simply supported by the shaft fixing portion 63, the shielding plate portion 62 rotates around the shaft portion 61 depending on the strength of the water pressure of the water supplied from the washing pump 22. , to open and close the first opening 42a. Since the strength of the water pressure is proportional to the number of revolutions of the washing motor, the shutter 60 fully opens the first opening 42a when the number of revolutions is high, and closes or half-opens the first opening 42a when the number of revolutions is low.

Here, the rotation speed of the cleaning motor when the shutter 60 fully opens the first opening 42a is the rotation speed H [rpm] (hereinafter, rpm is omitted), and the rotation speed of the cleaning motor when the shutter 60 is half-opened is the rotation speed. L [rpm] (hereinafter rpm is omitted).

First, the case where the cleaning motor is operating at the rotational speed L will be described with reference to FIGS. 7 and 8. FIG.
FIG. 7 is a state diagram when the washing motor operates at the rotation speed L and the throttle member 27 is in the first state. Washing water in the bottom portion 20 b is supplied to the flow paths 48 and 50 via the suction flow path 21 and the washing pump 22 . At this time, since there is nothing blocking the supply path from the washing pump 22 through the second opening 42b to the flow paths 48 and 50, water can be sufficiently supplied. On the other hand, the first aperture 42a provided with the shutter 60 is in a state in which the shutter 60 half-opens the first aperture 42a and faces the diaphragm member 27. Therefore, the shutter 60 and the diaphragm member 27 serves as a resistance, and the amount of water supplied from the washing pump 22 to the flow paths 48 and 50 through the first opening 42a is throttled.

On the other hand, FIG. 8 is a state diagram when the washing motor operates at the rotation speed L and the diaphragm member 27 is in the second state. The water supplied from the second opening 42b is throttled by the opposing throttle member 27 acting as a resistance. In addition, the water supplied from the first opening 42a provided with the shutter 60 is in a state where the shutter 60 half-opens the first opening 42a, and this acts as a resistance. The amount of water is restricted.

Here, the amount of water supplied from the half-opened first opening 42a through the throttle member 27 in the first state and the amount of water supplied from the second opening 42b through the throttle member 27 in the second state Since the resistance at the throttle member 27 is strong, the amount of water to be drawn is almost the same amount.
Therefore, in the first state, water is supplied from the second opening 42b, but in the second state, water is supplied from the semi-closed first opening 42a. The amount of water injected changes.

Consider the change in the amount of sprayed water by replacing it with the load of the washing motor. Since the cleaning motor is controlled to operate at a constant rotation speed L, the constant rotation speed is maintained even when the load of the cleaning pump 22 varies depending on the opening of the shutter 60 and the position of the aperture member 27. controlled as follows. Therefore, the current value flowing through the cleaning motor is as shown in FIG.

In FIG. 9, in the second state, the load on the washing pump 22 is greater than in the first state, so the current value flowing through the washing motor increases so as to maintain the number of revolutions (see FIG. 9). 9B). Conversely, in the first state, the load on the cleaning pump 22 is smaller than in the second state, so the current value flowing through the cleaning motor is also reduced (A in FIG. 9). During one rotation of the cleaning nozzle 24, the position of the throttle member changes from the first state to the second state to the first state to the second state to the first state. Change. Further, as shown in FIG. 10, the load on the cleaning pump 22 does not change when the cleaning nozzle 24 is stopped, so the current value flowing through the cleaning motor does not change, and the cleaning nozzle 24 does not rotate normally. can be detected.

Next, the case when the cleaning motor is operating at the rotation speed H will be described with reference to FIGS. 11 and 12. FIG.
FIG. 11 is a state diagram when the cleaning motor operates at the number of revolutions H and the throttle member 27 is in the first state. Washing water in the bottom portion 20 b is supplied to the flow paths 48 and 50 via the suction flow path 21 and the washing pump 22 . At this time, since there is nothing blocking the supply path from the washing pump 22 to the flow paths 48 and 50 via the second opening 42b, sufficient water can be supplied. On the other hand, the first opening 42a provided with the shutter 60 is in a state where the shutter 60 fully opens the first opening 42a due to the washing water pressure, but since it is in a state facing the diaphragm member 27, washing is not possible. The amount of water supplied to nozzle 24 is throttled.

On the other hand, FIG. 12 is a state diagram when the cleaning motor operates at the rotation speed H and the diaphragm member 27 is in the second state. The amount of washing water supplied from the second opening 42b is throttled by the opposed throttle member 27 acting as a resistance. The first opening 42a provided with the shutter 60 is in a state where the shutter 60 fully opens the first opening 42a due to the washing water pressure, so that there is nothing blocking the supply path, so that water can be sufficiently supplied.

Thus, when the cleaning motor is operating at the number of revolutions H, the amount of water supplied to the cleaning nozzle 24 does not change much between the first state and the second state.

Therefore, when the washing motor is operating at the number of revolutions H, the difference in the amount of water sprayed from the washing nozzle 24 is small between the first state and the second state. becomes almost constant at .

Next, the operation of the dishwasher 10 will be described based on the flow charts of FIGS. 14, 15 and 16. FIG.
FIG. 14 is a flow chart showing the dishwashing operation when the start switch 32b of the dishwashing machine 10 is pressed. The dish washing operation includes an operation preparation step S1, a washing step S2, a rinsing 1 step S3, a rinsing 2 step S4, a final rinsing step S5, a drying step S6, and a dry keeping step S7.

Next, the operation in the cleaning step S2 will be described with reference to the flow chart of FIG.
First, the controller 38 turns on the water supply valve 14 to supply water to the bottom portion 20b of the cleaning tank 20 (S11). After that, when the water level detection device 49 detects that the water stored in the washing tank has reached a predetermined water level (S12), the water supply valve is turned off to complete the water supply (S13).

After that, the control unit 38 turns on the cleaning motor and supplies current so that the cleaning motor rotates at the number of rotations L (S14). At this time, when the cleaning nozzle 24 rotates normally, the current value supplied to the cleaning motor fluctuates as shown in FIG. Further, when the cleaning nozzle 24 remains stationary, as shown in FIG. 10, the value of current supplied to the cleaning motor does not fluctuate much.

However, even if the cleaning nozzle 24 remains stationary, the current value will change somewhat due to noise, so it is necessary to allow a certain amount of leeway in the determination. Therefore, here, the current variation is compared with a predetermined value, and if the current variation is smaller than the predetermined value, it is judged to be defective. In theory, the predetermined value should be set to about half the current difference between the first state and the second state in FIG.

The control unit 38 determines whether or not there is a malfunction in the operation of the cleaning nozzle by detecting fluctuations in the current value for a predetermined period of time (S15). If it is determined that there is a defect, the washing motor is turned off (S22), and the annunciator 36 is operated to notify the user of the abnormality (S23). As a result, for example, even if the user accidentally puts dishes out of the basket and the washing nozzle cannot operate normally, the defect can be detected early in the washing process and notified to the user. It is possible to encourage improvement in

Also, when it is judged to be normal in S15, the control unit 38 switches the number of rotations of the washing motor to a value H larger than L (S16), and continues for a predetermined time (S17).

In the process of S17, since the amount of water supplied to the washing nozzle 24 from the first opening 42a and the second opening 42b is the same, the amount of water injected from the injection port 30 is also substantially constant. The amount of water applied to each position is almost the same, and uneven washing does not occur.

After S17, the washing motor is turned off (S18), the drainage motor is turned on (S19), this state is continued until the drainage is completed (S20), and then the drainage motor is turned off (S20). ).

By doing so, it is possible to determine whether or not the cleaning nozzle 24 is rotating normally, and it is possible to suppress the occurrence of uneven cleaning depending on the position in the cleaning tank 20 .

Whether or not the cleaning nozzle 24 operates normally is detected only in the initial cleaning step in which the cleaning nozzle 24 operates. S3′), the second rinse step (S4′), and the final rinse step (S5′) are also added with steps such as S14 and S15 to detect whether or not the cleaning nozzle 24 operates normally. can be

In this case, during the washing process, chopsticks, spoons, etc. may be displaced due to the jet water pressure, or the position of the dishes may be displaced due to an external impact on the dishwasher 10. Even if the rotation is hindered, malfunctions can be detected before the end of operation, enabling early response.
In addition, various methods are conceivable for the operation of the alarm, such as generating an alarm sound with a buzzer or displaying an LED on the display.

Embodiment 2.
In Embodiment 1, the shutter 60 is provided on the first opening 42a of the communication portion 25a, but in this embodiment, it is provided on the aperture member 27. As shown in FIG. Since the configuration of the dishwasher except for the throttle member 27 and the communicating portion 25a is the same as that of the first embodiment, the description of the components is omitted.

FIG. 17 is a configuration diagram showing the configuration of the communicating portion 25a according to the second embodiment.
A third opening 42c and a fourth opening 42d for supplying the water supplied from the washing pump 22 into the washing nozzle 24 are formed in the side wall of the communicating portion 25a. The third openings 42c are a set of openings arranged symmetrically with respect to the rotation axis A, and the fourth openings 42d are a set of openings arranged at intervals of 90° from the third openings 42c. The third opening 42c and the fourth opening 42d are arranged at intervals of 90° on a circumference around the rotation axis A. As shown in FIG. Further, the opening area of the fourth opening 42d is smaller than that of the third opening 42c, and is approximately 1/8.

18 and 19 are state diagrams when the washing motor is operating in the second embodiment.
First, on the lower plate 46, the diaphragm member 27, which is a plate-like member having a larger opening area than the third opening 42c and extending vertically from the lower plate 46 so as to surround a part of the side wall of the communicating portion 25a, rotates. It is provided symmetrically with respect to the axis A. A diaphragm opening 27a is formed in the diaphragm member 27, and a shutter 64 for opening and closing the diaphragm opening 27a is installed.

Similar to the shutter 60 shown in FIGS. 5 and 6, the shutter 64 is composed of an upper shaft portion and a shielding plate portion extending downward from the shaft portion. The shaft is pivotally supported on the . The shielding plate portion has substantially the same size as the diaphragm opening 27a.

When the cleaning nozzle 24 rotates around the rotation axis A, the throttle member 27 rotates around the communicating portion 25a. At this time, a first state (state in FIG. 18) in which the diaphragm member 27 faces the third opening 42c, a second state (state in FIG. 19) in which the diaphragm member 27 faces the fourth opening 42d, are alternately repeated.

Since the shaft portion of the shutter 64 is only supported by the shaft fixing portion, the shielding plate portion is moved around the shaft portion depending on the strength of the water pressure discharged from the third opening 42c or the fourth opening 42d. It rotates to open and close the diaphragm opening 27a. The strength of the water pressure depends on the rotational speed of the washing motor and the opening areas of the third opening 42c and the fourth opening 42d provided in the communicating portion 25a.

Here, when the fourth opening 42d is at a position facing the diaphragm member 27, the water pressure of the water discharged from the fourth opening 42d causes the shutter 64 to rotate and the diaphragm opening 27a to fully open. is the number of revolutions H1 [rpm] (hereinafter rpm is omitted), and when the third opening 42c is at a position facing the aperture member 27, the water pressure of the water discharged from the third opening 42c is almost the same as that of the shutter 64. The number of revolutions of the cleaning motor when it does not rotate and the diaphragm opening 27a is almost fully closed is assumed to be the number of revolutions L1 [rpm] (hereinafter rpm is omitted).

In FIGS. 18 and 19, the cleaning motor is operating at the number of revolutions L1.
FIG. 18 is a state diagram when the diaphragm member 27 is in the first state, and the shutter 64 fully closes the diaphragm opening 27a with the water pressure supplied from the third opening 42c. squeezed. Further, the water supplied from the fourth opening 42d is unobstructed in the supply path to the cleaning nozzle 24. As shown in FIG.

On the other hand, FIG. 19 is a state diagram when the cleaning motor operates at the rotation speed L1 and the throttle member 27 is in the second state. The water supplied from the third opening 42c can be sufficiently supplied because there is nothing blocking the supply path to the cleaning nozzle 24 . The water supplied from the fourth opening 42d is
Since the opening area is smaller than the opening area of the third opening 42c, the shutter 64 fully closes the diaphragm opening 27a, so that the diaphragm member 27 is stopped.

Therefore, in the second state, sufficient water can be supplied from the third opening 42c to the washing nozzle 24, but in the first state, the third opening 42c faces the throttle member 27. , the amount of water is throttled, and the water supply to the washing nozzle 24 is almost exclusively through the fourth opening 42d. Since the opening area of the fourth opening 42d is smaller than that of the third opening 42c, the amount of water supplied to the cleaning nozzle 24 is smaller, that is, the resistance is greater, in the first state than in the second state. The amount of water sprayed from the washing nozzle 24 in the first state is smaller than that in the second state.

Consider the change in the amount of sprayed water by replacing it with the load of the washing motor. Since the cleaning motor is controlled to operate at a constant number of revolutions L1, even when the load of the cleaning pump 22 varies depending on the position of the throttle member 27, the constant number of revolutions is maintained. Therefore, the current value flowing through the cleaning motor is as shown in FIG.

In FIG. 20, the load on the cleaning pump 22 in the first state is greater than in the second state, so the current value flowing through the cleaning motor increases so as to maintain the rotation speed (see FIG. 20). of A). Conversely, in the second state, the load on the cleaning pump 22 is smaller than in the first state, so the current value flowing through the cleaning motor is also reduced (B in FIG. 20). During one rotation of the cleaning nozzle 24, the position of the throttle member changes from the first state to the second state to the first state to the second state to the first state. Change. Also, as shown in FIG. 21, since the load on the cleaning pump 22 does not change when the cleaning nozzle 24 is stopped, the current value flowing through the cleaning motor does not change, and the cleaning nozzle 24 does not rotate normally. can be detected.

Next, the case where the cleaning motor is operating at the rotation speed H1 will be described with reference to FIGS. 22 and 23. FIG.

FIG. 22 is a state diagram when the diaphragm member 27 is in the first state. The shutter 64 is rotated by the water pressure supplied from the third opening 42c, and the diaphragm opening 27a is fully opened. can supply water. Further, the water supplied from the fourth opening 42d is unobstructed in the supply path to the washing nozzle 24. As shown in FIG.

FIG. 23 is a state diagram when the diaphragm member 27 is in the second state. The water supplied from the third opening 42c can be sufficiently supplied because there is nothing blocking the supply path to the cleaning nozzle 24 . Further, the shutter 64 is rotated by the water pressure of the water supplied from the fourth opening 42d, and the diaphragm opening 27a is fully opened, so that a sufficient amount of water can be supplied.

That is, when the cleaning motor is operating at the number of revolutions H1, the amount of water supplied to the cleaning nozzle 24 is substantially the same in the first state and the second state.

Therefore, the current value of the washing motor when the washing motor is operating at the number of revolutions H1 is the same as in FIG. become.

The operation of the dishwasher 10 in Embodiment 2 is the same except that the number of rotations in S14 of FIG. 15 is L1 and the number of rotations in S16 is H1.

Thus, even if the shutter is provided on the side of the aperture member 27, the same effect as in the first embodiment can be obtained.

Reference Signs List 10 dishwasher, 12 washing machine main body, 12a front opening, 14 water supply valve, 18 lid, 20 washing tank, 20a tableware storage port, 20b bottom, 21 suction channel, 22 washing pump, 24 washing nozzle, 24a center Nozzle 24b Rotating nozzle 25 Flow path 25a Communicating part 26 Heater 27 Throttle member 27a Throttle opening 30 Jet port 31 Water supply pipe 32 Input part 32a Power switch 32b Start switch 33 Water supply mechanism 34 Body side water supply connector 35 Washing tank side water supply connector 36 Alarm 37 Water supply connection pipe 38 Control unit 40 Dish basket 42a First opening 42b Second opening 42c Third opening 42d Fourth opening , 44 upper plate, 46 lower plate, 48 internal space, 49 water level detector, 50 internal space, 51 drainage pump, 52 drainage mechanism, 53 drainage pipe, 54 washing tank side drainage connector, 55 body side drainage connector, 56 Drainage trap, 57 Drainage connection pipe, 58 Drainage connection pipe, 60 Shutter, 61 Shaft portion, 62 Shielding plate portion, 63 Shaft fixing portion, 64 Shutter, 81 Casing, 98 Tableware

Claims (12)

a washing tank for accommodating tableware;
a rotatable washing nozzle disposed in the washing tank for injecting water;
a wash pump for supplying water;
a cylindrical communicating portion communicating between the washing pump and the washing nozzle and supplying water supplied from the washing pump to the washing nozzle;
a throttle member arranged in the washing nozzle and formed to partially cover a side surface of the communicating portion;
A first opening, a second opening having the same opening area as that of the first opening, and a shutter for opening and closing the first opening are provided on a side surface of the communicating portion at a position facing the diaphragm member when the cleaning nozzle rotates. and wherein the shutter changes the degree of opening of the first opening according to the amount of water supplied from the washing pump. 2. The tableware according to claim 1, wherein the washing pump has an impeller and a washing motor for rotating the impeller, and the amount of water supplied from the washing pump changes according to the rotation speed of the washing motor. washing machine. The cleaning motor can rotate the impeller at a first rotation speed and a second rotation speed that is higher than the first rotation speed. 3. The dishwasher according to claim 2, wherein the first opening is fully opened by the shutter when it is in a half-opened state and is rotating at the second rotation speed. Equipped with a control unit that controls the number of rotations of the cleaning motor,
3. The control unit stops the rotation of the washing motor when a change in a current value flowing through the washing motor when the washing motor is operated at the first rotation speed is less than a predetermined value. 3. The dishwasher according to 3. a washing tank for accommodating tableware;
a rotatable washing nozzle disposed in the washing tank for injecting water;
a wash pump for supplying water;
a cylindrical communicating portion communicating between the washing pump and the washing nozzle and supplying water supplied from the washing pump to the washing nozzle;
a throttle member arranged in the washing nozzle and formed to partially cover a side surface of the communicating portion;
A third opening and a fourth opening having an opening area smaller than that of the third opening are provided at a side surface of the communicating portion at a position facing the diaphragm member when the cleaning nozzle rotates,
A dishwasher, wherein the diaphragm member is provided with a diaphragm opening and a shutter for opening and closing the diaphragm opening, wherein the shutter changes the degree of opening of the diaphragm opening according to the amount of water supplied from the washing pump. 6. The tableware according to claim 5, wherein the washing pump has an impeller and a washing motor for rotating the impeller, and the amount of water supplied from the washing pump changes according to the rotation speed of the washing motor. washing machine. The washing motor can rotate at a first rotation speed and a second rotation speed that is higher than the first rotation speed. When rotating at the first rotation speed, the diaphragm opening is fully closed or half-opened by the shutter. 7. The dishwasher according to claim 6, wherein said diaphragm opening is fully opened by said shutter when rotating at said second number of revolutions. Equipped with a control unit that controls the rotation of the cleaning motor,
3. The control unit stops the rotation of the washing motor when a change in a current value flowing through the washing motor when the washing motor is operated at the first rotation speed is less than a predetermined value. 7. The dishwasher according to 7. a washing tank for accommodating tableware;
a rotatable washing nozzle disposed in the washing tank for injecting water;
a cleaning pump that supplies water and has an impeller and a cleaning motor that rotates the impeller;
a cylindrical communicating portion communicating between the washing pump and the washing nozzle and supplying water supplied from the washing pump to the washing nozzle;
a throttle member disposed in the cleaning nozzle and formed to cover at least a portion of a side surface of the communicating portion;
a control unit that controls the rotation of the washing motor;
with
A first opening, a second opening having the same opening area as that of the first opening, and a shutter for opening and closing the first opening are provided on a side surface of the communication portion at a position facing the diaphragm member when the cleaning nozzle rotates. provided,
The cleaning motor is rotatable at a first rotation speed and a second rotation speed greater than the first rotation speed, and when rotating at the first rotation speed, the first opening is completely closed by the shutter. A dishwashing method for a dishwasher in which the first opening is fully opened by the shutter when it is in a closed or half-opened state and is rotating at the second rotation speed, comprising:
a washing step of spraying water accumulated in a washing tank onto the tableware from the washing nozzle;
A dishwashing method, wherein in the washing step, the washing motor rotates at the first speed, and then rotates at the second speed. Having a rinsing step performed after the washing step,
10. The method of claim 9, wherein the rinsing step comprises rotating the wash motor at a first speed and then rotating at a second speed. a washing tank for accommodating tableware;
a rotatable washing nozzle disposed in the washing tank for injecting water;
a cleaning pump that supplies water and has an impeller and a cleaning motor that rotates the impeller;
a cylindrical communicating portion communicating between the washing pump and the washing nozzle and supplying water supplied from the washing pump to the washing nozzle;
a throttle member disposed in the cleaning nozzle and formed to cover at least a portion of a side surface of the communicating portion;
A control unit for controlling rotation of the cleaning motor,
A third opening and a fourth opening having an opening area smaller than that of the third opening are provided on a side surface of the communication portion at a position facing the diaphragm member when the cleaning nozzle rotates,
The diaphragm member is provided with a diaphragm opening and a shutter for opening and closing the diaphragm opening, and the cleaning motor is rotatable at a first rotation speed and a second rotation speed larger than the first rotation speed, and the first rotation speed. When rotating at the second rotation speed, the diaphragm opening is fully closed or half-opened by the shutter, and when rotating at the second rotation speed, the diaphragm opening is fully opened by the shutter. A dishwashing method of
a washing step of spraying water accumulated in the washing tank onto the tableware from the washing nozzle;
A dishwashing method, wherein in the washing step, the washing motor rotates at the first speed, and then rotates at the second speed. Having a rinsing step performed after the washing step,
12. The method of claim 11, wherein the rinsing step comprises rotating the cleaning motor at a first speed and then rotating at a second speed.

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