JP4916566B2 - Dishwasher - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a dishwasher that jets washing water pressurized by a washing pump from a washing nozzle to wash dishes arranged in a washing tank.

  As a conventional tableware washing machine, there is one in which washing water is intermittently jetted from a nozzle to wash tableware in a washing tank (see, for example, Patent Document 1).

JP 2002-17646 A (first page, FIG. 1)

  In the conventional dishwasher described above, since the washing water is intermittently ejected from the nozzle, the washing water exerts a large impact on the dirt adhering to the tableware and improves the washing power. Since the nozzle rotates with the reaction force of the wash water to be jetted, the nozzle continues to rotate with some inertia after the jetting of the wash water stops, and then rotates again with the reaction force by the jet of wash water. In other words, a portion that is not exposed to the intermittently sprayed cleaning water is generated. The dirt adhered to the tableware that is not exposed to the intermittently sprayed cleaning water does not exert any cleaning power, and the tableware may be left unwashed.

  The present invention has been made to solve the above-described problems, and is a tableware that improves the cleaning power regardless of the installation position of the tableware, eliminates unwashed residue, and reduces the amount of water used for cleaning. The purpose is to provide a washing machine.

  The dishwasher according to the present invention includes a washing tank for storing tableware, a washing pump for sucking and pressurizing water stored in the washing tank according to the number of rotations, and a washing tank. A cleaning nozzle that rotates while jetting water in response to pressurization from the pump, and a control unit that controls the number of rotations of the cleaning pump. The control unit includes a first high rotation number and a low number of rotations. Are controlled to rotate repeatedly as the first cycle, and then controlled to rotate repeatedly as the second cycle with the second high rotation speed and the low rotation speed different from the first high rotation speed, The control is repeated.

  In the present invention, the cleaning pump is controlled to rotate repeatedly with the first high rotation speed and the low rotation speed as the first cycle, and then the second high rotation speed different from the first high rotation speed and the above-mentioned Control is performed so as to rotate repeatedly with the low rotation speed as the second period, and these controls are repeated. Thereby, there is no unwashed residue regardless of the height at which dirt is present, and the cleaning power can be increased. In addition, as described above, since the cycle of pulse injection at different rotational speeds is different, cleaning can be performed uniformly regardless of the position of the tableware.

It is a schematic block diagram which shows the dishwasher which concerns on Embodiment 1 of this invention. It is the top view which looked at the washing tank and washing nozzle of the dishwasher from the upper part. It is a figure which shows the correlation with the rotation position of a washing nozzle, and the rotation speed of a washing pump. It is the top view which looked at the washing tank and washing nozzle of the dishwasher in Embodiment 2 from the upper part. It is a figure which shows the correlation with the rotation position of a washing nozzle, and the rotation speed of a washing pump. It is a figure which shows the correlation with the rotation position of the washing nozzle in Embodiment 3, and the rotation speed of a washing pump. It is a figure which shows the correlation with the driving | operation time and rotation speed of the washing pump in Embodiment 4 of this invention. It is a figure which shows the correlation with the random operation time of the washing pump in Embodiment 5, and rotation speed. It is a figure which shows the injection amount at the time of two types of high rotations of the washing pump in Embodiment 5 with respect to time. It is the top view which looked at the washing tank and washing nozzle for demonstrating operation | movement of the washing pump in Embodiment 7 from the upper part.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram showing a dishwasher according to Embodiment 1 of the present invention, FIG. 2 is a plan view of a washing tank and a washing nozzle of the dishwasher as viewed from above, and FIG. 3 is a rotational position of the washing nozzle. It is a figure which shows the correlation with the rotation speed of a washing pump.
The main body 1 of the dishwasher has a tank 2 for storing water 4 used for washing and rinsing dishes, a washing tank 6 in which a lower basket 16 and an upper basket 17 for placing dishes are arranged, A hot water supply pump 7, a cleaning pump 9 comprising a motor 19 and a casing portion 11 (with built-in blades), a cleaning nozzle 10 having an introduction passage 10b rotatably attached to the cleaning pump 9, a drainage pump 14, and each of the pumps described above A control unit 12 that controls the operation is provided.

  The tank 2 is provided with a water inlet 3 for drawing tap water and pouring water into the tank 2 and a heater 5 for heating the injected water 4. A filter 18 that collects residual vegetables contained in the washing water or the rinsing water is detachably installed on the upstream side of the pipe line connecting the washing tank 6 and the washing pump 9. A rotational position detector 13 is provided below the cleaning nozzle 10. The rotational position detector 13 is composed of, for example, a micro switch, and is arranged at the position shown in FIG. 2. When the protrusion 10 c provided in the introduction path 10 b of the cleaning nozzle 10 is detected, a detection signal of one pulse is controlled by the controller. 12 is output.

  The water 4 in the tank 2 warmed by the heater 5 is sucked by the hot water supply pump 7 and supplied into the cleaning tank 6 from the hot water supply port 8 in an amount necessary for rinsing or rinsing. The water 4 in the cleaning tank 6 is sucked and pressurized by the cleaning pump 9 and is sprayed from a plurality of injection ports 10 a provided in the cleaning nozzle 10. The washing nozzle 10 is rotated in one direction by the reaction force at the time of water injection. The water 4 in the cleaning tank 6 is sucked by the drain pump 14 after the cleaning or rinsing is completed, and is discharged from the drain port 15 to the outside.

  When the control unit 12 operates the cleaning pump 9, first, the control signal for low rotation is output to the motor 19 of the cleaning pump 9, and when the detection signal from the rotational position detection unit 13 is input, the control unit 12 performs high rotation. The control signal is switched to the motor 19 and output to the motor 19. At this time, for example, measurement of time is started to determine whether or not a predetermined time has elapsed. When the measurement time has elapsed for a predetermined time, the control signal for low rotation is output to the motor 19 of the cleaning pump 9 again. The low rotation control signal is a voltage for operating the motor 19 at a low rotation, and the high rotation control signal is a voltage for operating the motor 19 at a high rotation. The voltage value is higher. The operation of the cleaning pump 9 by the control unit 12 is performed in a cleaning process and a rinsing process.

Next, the operation during the operation of the cleaning pump will be described with reference to FIGS.
When the control signal for low rotation is output from the control unit 12 to the motor 19 of the cleaning pump 9, the cleaning pump 9 rotates at low speed based on the control signal for low rotation and sucks the warm water 4 in the cleaning tank 6. The pressure is then applied to the cleaning nozzle 10. At this time, the cleaning nozzle 10 injects the water 4 that has flowed in from the injection port 10a, and rotates in the direction of the arrow shown in FIG. 2 by the reaction force of the injection amount. In this case, since the injection amount is relatively smaller than when the cleaning pump 9 rotates at a high speed, the rotational speed of the cleaning nozzle 10 is also relatively slow, and small dishes arranged in the washable area are cleaned.

  On the other hand, the controller 12 determines whether or not the protrusion 10c provided in the introduction path 10b of the cleaning nozzle 10 is detected by the rotational position detector 13, and when the protrusion 10c is not detected, The low rotation operation of the cleaning pump 9 is continued. When the protrusion 10c is detected by the rotational position detector 13, the control signal is switched from the low rotation control signal to the high rotation control signal and output to the motor 19 of the cleaning pump 9, and time measurement is started. At this time, as shown in FIG. 3, the cleaning pump 9 changes from a low rotation speed to a high rotation speed, sucks and pressurizes a large amount of warm water 4 in the cleaning tank 6, and sends it to the cleaning nozzle 10. The washing nozzle 10 injects the water 4 having a large inflow amount from the injection port 10a, and rotates faster than the low rotation speed in the same direction as described above by the reaction force of the injection amount. The timing at which the amount of water sprayed from the washing nozzle 10 is large and the rotation speeds up is where the protruding portion 10c has entered the area of the hatched portion (see FIG. 2) after being detected by the rotational position detector 13a. In this case, as described above, the injection flow rate of the water 4 is increased as compared with that at the time of low rotation, so that the water 4 is injected to a high position, and relatively large dishes such as platters and dishes in the opposite area are washed. .

  The control unit 12 determines whether or not the measured time has passed a predetermined time. When the measured time has passed the predetermined time, the control unit 12 switches again from the high-rotation control signal to the low-rotation control signal. 9, the rotation speed of the cleaning pump 9 is switched from high rotation to low rotation, and water 4 having a relatively small amount of water is injected from the injection port 10 a of the cleaning nozzle 10. When the cleaning pump 9 is switched from high rotation to low rotation, the period during which the amount of water sprayed from the cleaning nozzle 10 is large is an area with a fan-shaped hatched portion as shown in FIG. When the protrusion 10c of the cleaning nozzle 10 is detected again by the rotational position detector 13, a high rotation control signal for rotating the cleaning pump 9 at high speed is output to the motor 19, and the above-described operation is repeated. The dishes in the washing tank 6 are washed.

  As described above, according to the first embodiment, the cleaning pump 9 is rotated at a high speed until a predetermined time elapses after the rotational position detection unit 13 detects the protrusion 10c of the cleaning nozzle 10, and the flow rate from the cleaning nozzle 10 is reduced. A large amount of water is sprayed, and in other areas, the cleaning pump 9 is rotated at a low speed so that a relatively small amount of water is sprayed from the cleaning nozzle 10, and this is repeated. Can be washed evenly, and dishes can be washed with a smaller amount of water used compared to a dishwasher that injects the amount of water in a constant intermittent operation, thus improving the water-saving effect. Furthermore, since the motor 19 constituting the cleaning pump 9 is not always operated at a high speed, the load applied to the motor 19 can be reduced and the life of the motor 19 can be extended.

Embodiment 2. FIG.
In the first embodiment, the cleaning pump 9 is controlled to rotate at a high speed only in a specific area in the cleaning tank 6 and a large amount of water is jetted from the cleaning nozzle 10 in this area. In this embodiment, in addition to the control of the first embodiment, when the cleaning nozzle rotates below the upper basket, the cleaning pump is again rotated at a high speed. FIG. 1, FIG. 4 and FIG. Will be described. In addition, this Embodiment is the dishwasher provided with another rotational position detection part 13a in addition to the rotational position detection part 13, and it is the same structure as Embodiment 1 demonstrated in FIG. 1 other than that. It has become.
4 is a plan view of the washing tub and the washing nozzle of the dishwasher according to the second embodiment as viewed from above, and FIG. 5 is a diagram showing the correlation between the rotation position of the washing nozzle and the rotation number of the washing pump.

  In the second embodiment, in addition to the rotational position detector 13, another rotational position detector 13 a is provided below the cleaning nozzle 10. The rotational position detector 13a is composed of a micro switch as described above, and detects the protrusion 10c of the cleaning nozzle 10 when the cleaning nozzle 10 comes below the upper basket 17, as shown in FIG. It arrange | positions in the vicinity of the introduction path 10b. Further, the control unit 12 in the present embodiment determines whether or not the first rotational position detection unit 13 has detected the protrusion 10c of the cleaning nozzle 10 when the cleaning pump 9 is operated at a low rotation, and the rotation is performed. When the position detector 13 detects the protrusion 10c, it is determined whether another rotation position detector 13a has detected the protrusion 10c. In addition, a first time for rotating the cleaning pump 9 at a high speed is set for the detection of the rotational position detection unit 13, and a second time for rotating the cleaning pump 9 at a high speed for the detection of the rotational position detection unit 13a is set. The relationship between these times is as follows: first time> second time. The operation of the cleaning pump 9 by the control unit 12 is performed in a cleaning process and a rinsing process.

Next, the operation during the operation of the cleaning pump will be described with reference to FIGS.
As in the first embodiment, when the low rotation control signal is output from the control unit 12 to the motor 19 of the cleaning pump 9, the cleaning pump 9 rotates at low speed based on the low rotation control signal, and the cleaning tank The warm water 4 in the tank 6 is sucked and pressurized, and sent to the washing nozzle 10. At this time, the cleaning nozzle 10 injects the water 4 that has flowed in from the injection port 10a, and rotates in the direction of the arrow shown in FIG. 4 by the reaction force of the injection amount. In this case, since the injection amount is relatively smaller than when the cleaning pump 9 rotates at a high speed, the rotational speed of the cleaning nozzle 10 is also relatively slow, and small dishes arranged in the washable area are cleaned.

  On the other hand, the control unit 12 determines whether or not the protruding portion 10c of the cleaning nozzle 10 is detected by the rotational position detecting unit 13, and when the protruding portion 10c is not detected, the low rotation operation of the cleaning pump 9 is performed. Continue. When the protrusion 10c of the cleaning nozzle 10 is detected by the rotational position detector 13, the control signal for low rotation is switched from the control signal for high rotation to the motor 19 for the cleaning pump 9, and time measurement is started. . At this time, as shown in FIG. 5, the cleaning pump 9 changes from a low rotation speed to a high rotation speed, sucks and pressurizes a large amount of warm water 4 in the cleaning tank 6, and sends it to the cleaning nozzle 10. The washing nozzle 10 injects the water 4 having a large inflow amount from the injection port 10a, and rotates faster than the low rotation speed in the same direction as described above by the reaction force of the injection amount. The timing at which the amount of water sprayed from the washing nozzle 10 is large and the rotation speeds up is where the protruding portion 10c has entered the area of the hatched portion (see FIG. 4) after being detected by the rotational position detector 13. In this case, as described above, the injection flow rate of the water 4 is increased as compared with that at the time of low rotation, so that the water 4 is injected to a high position, and relatively large dishes such as platters and dishes in the opposite area are washed. .

  The controller 12 determines whether or not the measured time has passed the first time, and when the measured time has passed the first time, the control signal for high rotation is changed from the control signal for high rotation again. It switches and outputs to the motor 19 of the washing | cleaning pump 9, the rotation speed of the washing pump 9 is switched from high rotation to low rotation, and the water 4 with comparatively little water quantity is injected from the injection port 10a of the washing nozzle 10. FIG. When the cleaning pump 9 is switched from high rotation to low rotation, the period during which the amount of water sprayed from the cleaning nozzle 10 is large becomes a fan-shaped hatched area as in the first embodiment (see FIG. 4).

  Thereafter, the control unit 12 determines whether or not the protrusion 10c of the cleaning nozzle 10 is detected by the rotational position detection unit 13a. When the protrusion 10c is not detected, the control unit 12 continues the low rotation operation of the cleaning pump 9. To do. When the protrusion 10c of the cleaning nozzle 10 is detected by the rotational position detector 13a, a high-rotation control signal for rotating the cleaning pump 9 at high speed is output to the motor 19 and time measurement is started. It is determined whether or not the second time has elapsed. At this time, as shown in FIG. 5, the cleaning pump 9 again turns from a low rotation speed to a high rotation, sucks and pressurizes a large amount of warm water 4 in the cleaning tank 6, and sends it to the cleaning nozzle 10. The washing nozzle 10 again injects the water 4 having a large inflow amount from the injection port 10a, and rotates faster in the same direction as the above than in the low rotation by the reaction force of the injection amount. The timing at which the amount of water sprayed from the cleaning nozzle 10 is large and the rotation speeds up is where the protrusion 10c has entered the area of the shaded portion (see FIG. 4) after being detected by the rotational position detector 13a. In this case, since the injection flow rate of the water 4 increases as compared with the case of the low rotation, the water 4 is injected to a high position, and the dishes installed in the upper basket 17 and the dishes in the opposite area are washed. Is done.

  On the other hand, the control unit 12 determines whether or not the measured time has passed the second time, and when the measured time has passed the second time, the control signal for low rotation is changed from the control signal for high rotation. Is output to the motor 19 of the cleaning pump 9, the rotational speed of the cleaning pump 9 is switched from high to low, and water 4 having a relatively small amount of water is injected from the injection port 10a of the cleaning nozzle 10, and the series described above. The above operation is repeated to wash the dishes in the washing tub 6. Note that the second period of the injection amount in which the washing pump 9 is switched from the high rotation to the low rotation is a fan-shaped shaded area as shown in FIG.

  As described above, according to the second embodiment, it is possible to detect the rotational position of the cleaning nozzle and appropriately spray the cleaning water from the cleaning nozzle 10 in accordance with the place where the dishes are arranged. Appropriate cleaning water can be given to the arranged tableware, and the cleaning power is improved.

Embodiment 3 FIG.
In the first and second embodiments described above, the rotation speed of the cleaning pump 9 by the control unit 12 is changed in a pulse manner, but in this embodiment, the rotation speed of the cleaning pump is linearly changed. This will be described below, and will be described below with reference to FIGS. 1, 2, and 6. In addition, this Embodiment is the dishwasher provided with the two rotational position detection parts 13 and 13a, and has the same structure as Embodiment 1 demonstrated in FIG.1 and FIG.2 other than that.
FIG. 6 is a diagram showing the correlation between the rotational position of the cleaning nozzle and the rotational speed of the cleaning pump in the third embodiment.

  In the third embodiment, for example, in FIG. 2, when the cleaning nozzle 10 rotates to the left side, the rotational position detector 13 is arranged so as to immediately detect the protrusion 10c provided in the introduction path 10b. The rotational position detector 13a is arranged at a position (within the shaded area) rotated approximately 180 degrees from the rotational position detector 13 with the introduction path 10b as an axis. In addition, the control unit 12 in the third embodiment starts the operation of the cleaning pump 9 at a low rotation, and when the protrusion 10c of the cleaning nozzle 10 is detected by the rotational position detection unit 13, the rotation speed of the cleaning pump 9 Is controlled so as to gradually increase from a low rotation, and this control is continued until another rotation position detection unit 13a detects the protrusion 10c. And when the protrusion part 10c is detected by the rotation position detection part 13a, it controls so that the rotation speed of the washing pump 9 gradually becomes low from high rotation until the rotation position detection part 13 detects the protrusion part 10c, The above-described control is repeatedly performed. The operation of the cleaning pump 9 by the control unit 12 is performed in a cleaning process and a rinsing process.

Next, the operation during the operation of the cleaning pump will be described with reference to FIGS.
When operating the cleaning pump 9, the control unit 12 first controls the rotation speed of the motor 19 so that the cleaning pump 9 operates at a low speed, and then the rotational position detection unit 13 detects the protrusion 10 c. Determine whether or not. When the rotation position detector 13 does not detect the protrusion 10c, the above-described control is continued. When the protrusion 10c is detected by the rotation position detector 13, the rotation of the motor 19 is performed as shown in FIG. The number is controlled so as to gradually increase, and it is determined whether or not the protrusion 10c is detected by another rotational position detector 13a. When the protrusion 10c is not detected by the rotational position detector 13a, the rotation speed of the motor 19 is further increased, and when the protrusion 10c is detected, the motor 19 is gradually decreased from the high rotation. (See FIG. 6), it is determined again whether the protrusion 10c is detected by the rotational position detector 13. Then, when the rotation position detector 13 detects the protrusion 10c while gradually reducing the rotation speed of the motor 19, the rotation speed of the motor 19 is controlled so as to gradually increase from the low rotation, The series of operations described above are repeated.

  On the other hand, when the amount of water due to low rotation of the cleaning pump 9 is introduced, the cleaning nozzle 10 injects water 4 from the injection port 10a and starts rotating in the direction of the arrow shown in FIG. 2 by the reaction force of the injection amount. Then, when the protrusion 10c is detected by the rotation position detector 13, the rotation is rotated while gradually increasing the amount of water 4 injected, and the water is injected as it approaches the shaded area shown in FIG. The amount increases, and the injection amount further increases in the shaded area. In this case, the rotation speed of the cleaning nozzle 10 increases as the injection amount increases. Then, when the protrusion 10c is detected by the other rotational position detector 13a, the injection amount of the water 4 gradually decreases with this as a timing, and further the injection amount as the distance from the shaded area increases. Will decrease. In this case, the rotation speed of the cleaning nozzle 10 decreases as the injection amount decreases. Further, when the protrusion 10c is detected again by the rotational position detector 13, the injection amount from the cleaning nozzle 10 gradually increases in the same manner as described above, and the operation according to the rotational speed of the cleaning pump 9 is repeated. .

  As described above, according to the third embodiment, since the rotational speed of the cleaning pump 3 is linearly increased or decreased, the rotational speed of the motor 19 changes sharply in addition to the effects of the first and second embodiments. Therefore, the load on the motor 19 can be further reduced. Further, since the injection amount from the cleaning nozzle 10 gradually increases or decreases, the impact sound when the water 4 hits the inner wall of the tableware or the cleaning tank 6 is not an intermittent sound as in pulse driving, but is continuous. Therefore, there is an effect of noise reduction.

Embodiment 4 FIG.
FIG. 7 is a diagram showing the correlation between the operation time and the rotational speed of the cleaning pump in the fourth embodiment of the present invention. In addition, the dishwasher of this Embodiment becomes a structure without the protrusion part 10c and the rotation position detection part 13 which are shown in FIG. 1, and is otherwise the same as Embodiment 1 demonstrated in FIG. It is.

  As shown in FIG. 7, the cleaning pump 9 in the present embodiment is m times (for example, 3 times) with a high rotation speed A1 (first high rotation speed) and a low rotation speed as a cycle T1 (first cycle). After that, the high rotational speed A2 (second high rotational speed) and the low rotational speed are repeated n times (for example, 5 times) as the period T2 (second period), and this is alternately repeated. . Each cycle has a relationship of T1 ≠ T2, and the relationship between the rotation speed A1 at the time of high rotation in the cycle T1 and the rotation speed A2 at the time of high rotation in the cycle T2 is A1> A2. The operation pattern of the cleaning pump 9 described above is performed in the cleaning process and the rinsing process, and is executed under the control of the control unit 12.

Next, the operation during the operation of the cleaning pump will be described with reference to FIG.
When the control unit 12 controls the rotation of the motor 19 so that the cleaning pump 9 is operated in the pattern shown in FIG. 7, the cleaning nozzle 10 is rotated at a high rotation speed (the number of rotations A1) in the cycle T1. ) Is injected with a large amount of water 4, and is sprayed with a small amount of water 4 during low rotation, and this is repeated three times while rotating. Thereafter, in cycle T2, water 4 having a relatively small injection amount is injected at the time of high rotation (rotation speed A2) of cleaning pump 9, and the same injection amount as in cycle T1 is injected at low rotation. Water 4 is sprayed and this is repeated five times while rotating. And the tableware in the washing tank 6 is wash | cleaned, repeating the operation | movement mentioned above alternately. At the time of high rotation at the period T1 (rotation speed A1), the amount of injection from the cleaning nozzle 10 is the largest, and the injection is performed to a higher position of the cleaning tank 6, and at the time of high rotation at the period T2 (rotation speed A2) Since the number is lower than that at the time of A1, the amount of injection from the cleaning nozzle 10 is relatively small and is injected to the middle position of the cleaning tank 6. Further, at the time of low rotation in the periods T1 and T2, the amount of injection is It is sprayed to the lowest position of the washing tank 6 at the least.

  As described above, according to the fourth embodiment, high rotation (rotation speed A) is repeated 3 times for each cycle T1, and high rotation (rotation speed A2) is repeated 5 times for each cycle T2, and this is alternately performed. Since the cleaning pump 9 is operated so as to repeat, there is no unwashed residue regardless of the height at which dirt is present, and the cleaning power can be increased. In addition, as described above, since the cycle of pulse injection at different rotational speeds (A1> A2) is different, it is possible to wash evenly regardless of the position of the tableware.

Embodiment 5 FIG.
In the fourth embodiment, the high rotation (rotation speed A) is repeated 3 times for each cycle T1, and the high rotation (rotation speed A2) is repeated 5 times for each cycle T2, and this is alternately repeated. In the present embodiment, as shown in FIG. 8, the number of cycles T1 and T2 for rotating the cleaning pump 9 at a high speed (rotations A1 and A2) is randomly switched, and the injection amount injected from the cleaning nozzle 10 is changed. It is intended to change. A pseudo-random number may be used to randomly determine the number of cycles T1 and T2, and this can be achieved by providing a pseudo-random number generator that generates the pseudo-random number. Instead of this, pseudo random numbers may be generated by a program set in the control unit 12 to determine the number of periods T1 and T2. In this case, the pseudo random number generator is not necessary.

  As described above, since the number of times of high rotation for each of the cycles T1 and T2 for operating the cleaning pump 9 is randomly performed, it is possible to eliminate the washing residue regardless of the height at which dirt is present. You can increase your power. Further, as described above, pulse injections with different rotational speeds are performed in a random order, so that the period of the pulse injection timing and the rotation period of the cleaning nozzle 10 can be prevented from being synchronized, and the position of the pulse injection can be specified. It is no longer fixed at the position of, and can be washed evenly regardless of the position of the tableware.

Embodiment 6 FIG.
In the fourth and fifth embodiments described above, the relationship between the number of rotations of the cleaning pump 9 at the time of high rotation (A1, A2) every cycle T1, T2 or the injection amount of pulse injection determined thereby and the injection time of pulse injection is particularly important. Although not specified, in this embodiment, the injection amount and the injection time are determined so that the amount of cleaning water used per unit time during the cleaning process and the rinsing process is always constant. is there. As shown in FIG. 9, the injection time and the injection amount at the high rotation in the cycle T1 and the injection time and the injection amount at the high rotation in the cycle T2 so that the total injection amount at the two high rotations becomes constant. And decide. Specifically, the product of the injection time and the injection amount may be made equal in each high speed operation (the same area as shown in FIG. 9).

  As described above, in the sixth embodiment, the total injection amount at the time of high rotation in the cycle T1 in which the cleaning pump 9 is operated is equal to the total injection amount at the time of high rotation in the cycle T2. The amount of washing water used is constant, and thus stable washing can be performed using the minimum necessary amount of water.

Embodiment 7 FIG.
FIG. 10 is a plan view of the cleaning tank and the cleaning nozzle for explaining the operation of the cleaning pump according to the seventh embodiment as seen from above, and the dish installed in the basket is also illustrated.
The dishes installed in the basket in the washing tank 6 are generally installed in parallel as shown in FIG. From this array of dishes, the washing water sprayed from the washing nozzle 10 is most effective for washing dishes when the washing nozzle 10 is rotated to a position substantially perpendicular to the position where the dish is installed.

In the present embodiment, the timing cycle of the cleaning pump 9 at the time of high rotation and the rotation cycle of the cleaning nozzle 10 are synchronized, and when the cleaning nozzle 10 rotates to a position substantially perpendicular to the dish, Make the rotation speed high. Assuming that the period of timing at the time of high rotation is Tp and the time for which the cleaning nozzle 10 rotates once is Tn, k is an integer,
k x Tn = Tp (1)
If this relationship is established, the cleaning nozzle 10 always performs pulse injection at the same angular position. Since Tn and Tp can be changed by controlling the rotation of the motor 19 of the cleaning pump 9, the expression (1) can be realized for an appropriate integer k.

  In this way, since the rotation of the cleaning nozzle 10 and the timing of pulse injection can be synchronized, in order to always perform pulse injection when the cleaning nozzle 10 rotates to a position substantially perpendicular to the dish, once When the cleaning nozzle 10 rotates to a position substantially perpendicular to the dish, pulse injection is performed, and thereafter pulse injection may be continued so as to satisfy the above formula (1). In order to perform pulse injection once the cleaning nozzle 10 has rotated to a position substantially perpendicular to the dish, the initial state of the cleaning nozzle 10 is always fixed at a position substantially perpendicular to the installation direction of the dish. Alternatively, a position sensor (not shown) may be used to detect once that the cleaning nozzle 10 has come to a position substantially perpendicular to the dish, and pulse injection may be performed at that time.

  As described above, in the dishwasher according to the seventh embodiment, the cleaning pump 9 is rotated at a high speed when the cleaning nozzle 10 is rotated to a position substantially perpendicular to the dish, so that it is most effective for removing dirt on the dish. The cleaning water of pulse jet can be applied to the dish at an angle, and the cleaning time can be shortened.

As a modified example of the seventh embodiment, there is a cleaning method in which pulse injection is not performed only when the cleaning nozzle 10 always rotates to a position substantially perpendicular to the dish, but pulse injection is performed when the cleaning nozzle 10 approaches the dish. is there. In order to realize this, it is only necessary to give a small fluctuation to the period Tp of the timing of pulse injection in the equation (1) indicating the synchronization condition. If the average of this fluctuation is 0, the position where the pulse is ejected is limited to the vicinity around the position where the cleaning nozzle 10 is perpendicular to the dish. Specifically, assuming that the time required for the cleaning nozzle 10 to rotate X degrees is t, the pulse injection timing is periodically changed as follows, for example.
Tp, Tp + 0.5t, Tp + t, Tp + 0.5t, Tp, Tp-0.5t, Tp-t, Tp-0.5t, Tp,.
Thus, by giving a small fluctuation to the timing period of the pulse injection, it is possible to perform the pulse injection within the range of plus or minus X degrees (see FIG. 10) where the cleaning nozzle 10 is at a position perpendicular to the dish.

  As described above, in the modified example of the seventh embodiment, pulse injection is performed not only when the position of the cleaning nozzle is in a direction perpendicular to the installation direction of the dish but also in the vicinity thereof, so that efficient cleaning is performed. In addition, it is possible to prevent unwashed residue due to the wash water being limited to a specific position.

  In each of the above-described embodiments, the configuration of the dishwasher has been described as a configuration in which the water 4 is temporarily stored in the tank 4 and heated, and then the hot water is supplied to the cleaning tank 6. However, the present invention is not limited thereto. Needless to say, the present invention can also be applied to a dishwasher of a type in which water 4 is directly poured into the washing tank 6 and heated by the heater 5 installed in the washing tank 6.

1 Main body of dishwasher, 2 tank, 5 heater, 6 washing tank, 7 hot water pump,
9 Washing pump, 10 Washing nozzle, 10c Protruding part, 11 Casing part, 12 Control part, 13, 13a Rotation position detecting part, 14 Drain pump, 19 Motor.

Claims (5)

A washing tank for storing tableware,
A cleaning pump that sucks and pressurizes water stored in the cleaning tank according to the number of rotations;
A cleaning nozzle disposed in the cleaning tank and rotating while spraying water in response to pressurization from the cleaning pump;
A control unit for controlling the number of rotations of the washing pump,
The control unit controls the cleaning pump to repeatedly rotate with a first high rotation speed and a low rotation speed as a first cycle, and then a second high rotation speed different from the first high rotation speed and A dishwasher characterized in that the low rotation speed is controlled to rotate repeatedly as a second period, and these controls are repeated.   The control unit controls the cleaning pump to repeatedly rotate with a first high rotation speed and a low rotation speed as a first cycle, and then a second high rotation speed different from the first high rotation speed and 2. The low rotation speed is controlled to rotate repeatedly with a second period, and the cleaning pump is controlled to rotate repeatedly with the first period and the second period being randomly repeated. The dishwasher described.   The control unit controls the injection time and the injection amount during high rotation in the first cycle and the second cycle so that the total injection amount injected from the cleaning nozzle is constant per unit time. A dishwasher according to claim 1 or 2.   2. The dishwasher according to claim 1, wherein when the washing nozzle is rotated to a predetermined angle, the controller sets the number of revolutions of the washing pump to a high number of revolutions.   2. The dishwasher according to claim 1, wherein when the washing nozzle is rotated to an angle close to a predetermined angle, the controller sets the number of revolutions of the washing pump to a high number of revolutions.

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