JP2007167290A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher which can eliminate any unwashed part and a reduction of water amount used for washing by improving capability for washing dishes. <P>SOLUTION: The dish washer is provided with a washing tank 6 containing dishes, a washing nozzle 10 installed inside the washing tank 6, a washing pump 9 that sucks and pressurizes water retained inside the washing tank 6 and injects from an injection tip 10a of the washing nozzle 10, and a controlling section 12 for controlling the number of rotation of the washing pump 9. The controlling section 12 controls the number of rotation by outputting preset low rotation controlling signal and high rotation controlling signal alternately into the washing pump 9 to change the amount of water injected from the washing nozzle 10. The amount of water injected is changed every time the washing nozzle 10 makes one rotation. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 ejected from a nozzle to wash tableware in a washing tank (for example, see 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 force 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 provides a dishwasher that improves the cleaning power of tableware, eliminates unwashed residue, and reduces the amount of water used for cleaning. The purpose is to do.

  The dishwasher according to the present invention is a washing tank for storing tableware, a washing nozzle disposed in the washing tank, having an injection port, and suctioning and pressurizing water stored in the washing tank, and washing. A cleaning pump that injects from the nozzle outlet and a control unit that controls the number of rotations of the cleaning pump. The control unit alternately performs a preset cleaning signal for low rotation and a control signal for high rotation. And the rotational speed is controlled to change the amount of water ejected from the cleaning nozzle, and this change in the amount of ejected water is performed at every predetermined rotation of the cleaning nozzle.

  In the present invention, a preset low-rotation control signal and high-rotation control signal are alternately output to the cleaning pump to control the rotational speed, and the amount of water ejected from the cleaning nozzle is changed. Since the change is made at every predetermined rotation of the washing nozzle, it becomes possible to wash the dishes in the washing tank evenly, and the average rotation of the washing pump is controlled by the low rotation control signal and the high rotation control signal. The number can be made lower than that of the prior art, and therefore the amount of water required for cleaning can be reduced.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram illustrating a dishwasher according to Embodiment 1 of the present invention, and FIG. 2 is a waveform diagram illustrating control signals during operation of the cleaning 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 placed, A hot water supply pump 7, a cleaning pump 9 comprising a motor 19 and a casing part 11 (with built-in blades), a cleaning nozzle 10 rotatably attached to the cleaning pump 9, a drainage pump 14, and a control for controlling the operation of each pump described above. A portion 12 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. In addition, a filter 18 that collects the leftovers 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.

  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, for example, as shown in FIG. 2, the control signal V having a different voltage value, that is, the low rotation control signal Vb and the high rotation control signal Vp are alternately motorized. 19 to control the rotation speed. The high-rotation control signal Vp is a voltage value that causes the motor 19 to operate at a high speed, and the low-rotation control signal Vb is a voltage value that causes the motor 19 to operate at a low speed, and has a relationship of Vp> Vb. ing. Also, the output time of the high-rotation control signal Vp and the low-rotation control signal Vb is set, the output time of the high-rotation control signal Vp (high-rotation operation time) is Tp, and the output of the low-rotation control signal Vb When the time (low rotation operation time) is Tb, the relationship is Tp <Tb. The sum of these Tp and Tb is defined as a period T of the control signal V, and the cleaning nozzle 10 is set to rotate, for example, once during the period T. The period T of the control signal V composed of the low rotation control signal Vp and the high rotation control signal Vp is 10 Hz or less in consideration of the followability of the rotation speed change with respect to the change in the control voltage V of the motor 19. It is desirable that

Next, the operation when the cleaning pump is operated will be described.
When the control signal V having the waveform shown in FIG. 2 is output from the control unit 12, the motor 19 of the cleaning pump 9 rotates at a high speed when the high-rotation control signal Vp is input and is low when the low-rotation control signal Vb is input. Rotate and repeat. When the motor 19 rotates at a high speed, a large amount of warm water 4 in the cleaning tank 6 is sucked and sent to the cleaning nozzle 10. At a low speed, a relatively small amount of water is sucked and sent to the cleaning nozzle 10 at a high speed. Is done. On the other hand, when the water 4 having a large flow rate is introduced, the washing nozzle 10 injects a large amount of water 4 by its pressure, and rotates in one direction for almost the high rotation operation time Tp by the reaction force of the injection amount. When a relatively small amount of water 4 flows in, the water amount corresponding to the pressure is injected, and the reaction force of the injection amount rotates in the same direction as described above for the low rotation operation time Tb, and this is washed. It repeats based on the rotation speed of the motor 19 of the pump 9.

As described above, according to the first embodiment, water 4 having a large flow rate is ejected from the washing nozzle 10 when the motor 19 of the washing pump 9 rotates at a high speed, and water 4 having a relatively small flow rate is ejected when the motor 19 rotates at a low speed. Since this is performed every time the cleaning nozzle 10 makes one rotation, the cleaning water is always sprayed from the cleaning nozzle 10, and even when the motor 19 has a low number of revolutions, the cleaning power for dishes is reduced. Furthermore, since a stronger cleaning power can be obtained when the motor 19 rotates at a high speed, the cleaning power for the dishes in the cleaning tank 6 can be improved as compared with the conventional case where intermittent cleaning is performed.
In addition, since the relationship between the low rotation operation time Tb and the high rotation operation time Tp of the motor 19 by alternately inputting the low rotation control signal Vb and the high rotation control signal Vp is set to Tb> Tp, the cleaning pump 9 can reduce the average number of rotations of the motor 19, thereby reducing the amount of water required for cleaning, reducing the load on the motor 19, and extending the life of the cleaning pump 9. It becomes possible.

  In the first embodiment, the period T of the control signal V composed of the low-rotation control signal Vb and the high-rotation control signal Vp is described as the time for the cleaning nozzle 10 to make one rotation. However, the present invention is not limited to this. For example, it may be set so that one cycle of the control signal V is repeated twice each time the cleaning nozzle 10 rotates once, and the same effect can be obtained.

Embodiment 2. FIG.
In the first embodiment, when the motor 19 of the cleaning pump 9 rotates at a high speed, water 4 having a large flow rate is injected from the cleaning nozzle 10, and when the motor 19 rotates at a low speed, water 4 having a suppressed flow rate is injected. 10 is performed every rotation to improve the detergency and reduce the amount of water used, but the second embodiment further improves the detergency. Hereinafter, a description will be given with reference to FIGS. 3 and 4.
FIG. 3 is an explanatory diagram of a control signal for washing pump operation in the dishwasher of the second embodiment, and FIG. 4 is a waveform diagram of a control signal obtained by combining the waveforms shown in FIG. In addition, since the structure of the dishwasher of this Embodiment is the same as Embodiment 1 demonstrated in FIG. 1, it demonstrates using FIG.

  In the dishwasher of the second embodiment, the control unit 12 has a waveform composed of the high rotation control signal Vp of the output time Tp and the low rotation control signal Vb of the output time Tb1 as the setting 1, and the output The waveform composed of the high-rotation control signal Vp at the time Tp and the low-rotation control signal Vb at the output time Tb2 is set as 2, and the high-rotation control signal Vp at the output time Tp and the low rotation at the output time Tb3 are set. A waveform composed of the control signal Vb for use is set as setting 3. The output times Tp of the high-rotation control signal Vp in the settings 1 to 3 are the same, the output times Tb1, Tb2, and Tb3 of the low-rotation control signal Vb are different, and the relationship is Tb1 <Tb2 <Tb3. Yes.

Next, the operation during the operation of the cleaning pump will be described with reference to FIG.
When the cleaning pump 9 is operated, as shown in FIG. 4, the controller 12 first outputs the waveform of setting 1 to the motor 19 of the cleaning pump 9, followed by the waveform of setting 2 and the waveform of setting 3. The output is sequentially performed, the waveform of the setting 3 is sequentially output again from the waveform of the setting 1, and this is repeated. In this control signal V, the output time Tp of the high-rotation control signal Vp is constant, and the output times of the low-rotation control signal Vb are changed to Tb1, Tb2, and Tb3. The timing changes, and the start timing of the low rotation changes accordingly. That is, the position where the water 4 having a large flow rate is ejected from the cleaning nozzle 10 rotating in the cleaning tank 6 changes.

  As described above, the output time Tp of the high-rotation control signal Vp is constant, and the output time of the low-rotation control signal Vb is changed to Tb1, Tb2, and Tb3. Therefore, in addition to the effects described in the first embodiment, the position where the water 4 with a large amount of water 4 and the water 4 with a relatively small flow rate are changed changes. It becomes possible to clean evenly, and high cleaning power can be obtained.

  In the second embodiment, the waveforms of setting 1, setting 2 and setting 3 composed of the high rotation control signal Vp having the same output time Tp and the low rotation control signal Vb having the different output time Tb are sequentially applied. Although output is repeatedly performed, the waveforms of setting 1, setting 2, and setting 3 may be output at random. In the second embodiment, the output time Tb of the low-rotation control signal Vb has been described as 3 settings. However, the output time Tb is not particularly limited to 3 settings, and the same effect can be obtained if a plurality of output times Tb are provided. It is clear that there is.

  Further, the output time Tp of the control signal Vp for high rotation is made constant and the output time Tb of the control signal Vb for low rotation is changed, but the output time Tb of the control signal Vb for low rotation is made constant and the control for high rotation is made. The output time Tp of the signal Vp may be changed, and the same effect can be obtained.

Embodiment 3 FIG.
The output time Tp of the high-rotation control signal Vp is constant and the output time Tb of the low-rotation control signal Vb is changed so that the injection timing of the water 4 with a high flow rate and the water 4 with a relatively low flow rate are shifted. In the present embodiment, another control for changing the position at which the water 4 having a large flow rate is ejected from the cleaning nozzle 10 rotating in the cleaning tank 6 will be described. explain.
FIG. 5 is a diagram for explaining the operation of the washing pump in the dishwasher of the third embodiment. In addition, since the structure of the dishwasher of this Embodiment is the same as Embodiment 1 demonstrated in FIG. 1, it demonstrates using FIG.

  In the control unit 12 provided in the dishwasher according to the third embodiment, for example, the setting times 1 and 2 of the control signal V and the operation times X1 and X1 of the motor 19 of the washing pump 9 associated with the setting 1 are set. 'And the operation times X2 and X2' of the motor 19 of the cleaning pump 9 associated with setting 2 are set. As shown in FIG. 3, setting 1 is a waveform composed of a high-rotation control signal Vp whose output time is Tp and a low-rotation control signal Vb whose output time is Tb1, and setting 2 is , A waveform composed of a high rotation control signal Vp with an output time Tp and a low rotation control signal Vb with an output time Tb2.

Next, the operation during the operation of the cleaning pump will be described with reference to FIG.
When operating the cleaning pump 9, the controller 12 first repeatedly outputs the waveform of the setting 1 of the control signal V to the motor 19 during the operation time X1, and then the control signal V of the control signal V during the operation time X2. Outputs the waveform of setting 2 repeatedly. Then, after the operation time X2 elapses, the waveform of setting 1 is output again, and this is repeated until the operation time X1 ′ elapses. Thereafter, the waveform of setting 2 is repeatedly output during the operation time X2 ′. By the output of the control signal V, the injection positions of the water 4 having a large flow rate and the water 4 having a relatively small flow rate from the cleaning nozzle 10 rotating in the cleaning tank 6 are changed.

  As described above, according to the third embodiment, the waveforms of the setting 1 and 2 of the control voltage V are output to the motor 19 of the cleaning pump 9 during different operation times, and the rotation speed of the motor 19 is set. Since it is made to change, the injection position of the water 4 with a large flow volume and the water 4 with a comparatively small flow volume will change, Therefore In addition to the effect demonstrated in Embodiment 1, the tableware in the washing tank 6 is changed. It becomes possible to clean evenly regardless of the position of installation, and a high cleaning power can be obtained.

  In each of the above-described embodiments, the water 4 stored in the tank 2 is heated by the heater 5 in the tank 2 and supplied to the cleaning tank 6 in an amount necessary for cleaning and rinsing. For example, the tank 2 may not be installed, and the water 4 may be supplied directly into the cleaning tank 6 and may be cleaned and rinsed while being heated by the heater 5 installed in the cleaning tank 6.

It is a schematic block diagram which shows the dishwasher which concerns on Embodiment 1 of this invention. It is a wave form diagram showing a control signal at the time of washing pump operation. It is explanatory drawing of the control signal for the washing pump operation | movement in the tableware washing machine of Embodiment 2. FIG. FIG. 4 is a waveform diagram of a control signal obtained by combining the waveforms shown in FIG. 3. It is a figure for demonstrating operation | movement of the washing pump in the tableware washing machine of Embodiment 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body of dishwasher, 2 tank, 5 heater, 6 washing tank, 7 hot water supply pump, 9 washing pump, 10 washing nozzle, 11 casing part, 12 control part, 14 drainage pump, 19 motor.

Claims (6)

A washing tank for storing tableware,
A cleaning nozzle disposed in the cleaning tank and having an injection port;
A cleaning pump that sucks and pressurizes water stored in the cleaning tank and injects it from an injection port of the cleaning nozzle;
A controller for controlling the rotation speed of the washing pump,
The control unit alternately outputs a preset low-rotation control signal and a high-rotation control signal to the washing pump to control the rotation speed, and changes the amount of water ejected from the washing nozzle. A dishwasher characterized in that the amount of water is changed every predetermined rotation of the washing nozzle.   2. The dishwasher according to claim 1, wherein an output time of the control signal for low rotation output alternately with the control signal for high rotation is set longer than the control signal for high rotation.   2. The dishwasher according to claim 1, wherein the control unit controls the number of rotations of the washing pump while changing an output time of the control signal for low rotation or the control signal for high rotation.   The control unit is configured such that a plurality of output times are set in advance for the low-rotation control signal, and the cleaning pump is controlled by the low-rotation control signal while switching the plurality of output times. 3. The dishwasher according to 3.   The control unit is configured such that a plurality of output times are set in advance for a control signal for high rotation, and the cleaning pump is controlled by the control signal for high rotation while switching the plurality of output times. 3. The dishwasher according to 3. The control unit is set in advance with a plurality of control signals having different periods configured by a combination of a low-rotation control signal and a high-rotation control signal, and the control signals having different periods are respectively set for the set operation time. 2. The dishwasher according to claim 1, wherein the rotation speed is controlled by outputting to the washing pump.

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