Operation control method of dish washing machine and dish washing machine

Abstract

The invention relates to an operation control method of a dish-washing machine and the dish-washing machine. The dish-washing machine comprises a cleaning tank, a spraying arm arranged in the cleaning tank, a water pump communicating with the spraying arm and a driving motor driving blades in the water pump to rotate, and a plurality of upper spraying holes are formed in the upper side surface of the spraying arm; the dish washing machine is characterized in that a plurality of lower spraying holes are further formed in the lower side surface of the spraying arm, and in the process that the dish washing machine executes a cleaning program, if it is detected that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be executed, the driving motor is controlled to cyclically execute the lower defoaming operation, and the defoaming measures need to be executed. The amount of foam generated in the cleaning tank does not reach the condition that the defoaming measure needs to be executed. Compared with the prior art, the spraying device has the advantages that the lower spraying holes are formed in the lower surface of the spraying arm, water flow sprayed downwards can destroy a foam structure, the defoaming effect is achieved, and in addition, the effect of improving the cleaning capacity is achieved through high-low alternate running of the rotating speed of the driving motor and running control over positive and negative rotation.

Description

Technical Field

[0001] The invention relates to an operation control method of a dishwasher and the dishwasher. Background Art

[0002] During the cleaning process of the dishwasher, detergent is put into the washing tank. The detergent in the washing water and the dirt on the surface of the kitchen utensils (such as grease, food residues, etc.) will produce a lot of foam when the blades of the water pump are stirred. The presence of a large amount of foam in the water will reduce the medium density of the water, resulting in a decrease in the working capacity of the water pump blades, thereby causing a decrease in the water pump power, which in turn affects the head of the water spray output to the spray arm, and ultimately causes the dishes to be washed uncleanly.

[0003] In the prior art, when the control panel recognizes that the water pump power has dropped, it often increases the speed of the motor driving the water pump to maintain the water pump power. However, increasing the motor speed will increase the generation of more foam, further reduce the head of the water pump, and the cleaning result will be worse. In the prior art, when a lot of foam is generated in the cleaning tank, there is no reasonable and effective defoaming measure. Therefore, the prior art needs to be further improved. Summary of the invention

[0004] The primary technical problem to be solved by the present invention is to provide an operation control method of a dishwasher which utilizes the design of existing structural components of the dishwasher to reduce or eliminate the bubbles in the washing tank in view of the above-mentioned prior art.

[0005] A further technical problem to be solved by the present invention is to provide a dishwasher which can reduce or eliminate the bubbles in the washing tank by utilizing the design of the existing structural components of the dishwasher in view of the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned primary technical problem is: a method for controlling the operation of a dishwasher, wherein the dishwasher includes a cleaning tank, a spray arm arranged in the cleaning tank, a water pump connected to the spray arm, and a driving motor for driving the blades in the water pump to rotate, a plurality of upper spray holes are arranged on the upper surface of the spray arm, and the characteristic is that: a plurality of lower spray holes are also arranged on the lower surface of the spray arm, during the dishwasher executing the cleaning program, if it is detected that the amount of foam generated in the cleaning tank reaches the condition that a defoaming measure needs to be executed, the driving motor is controlled to cyclically execute the following defoaming operation until the amount of foam generated in the cleaning tank does not reach the condition that a defoaming measure needs to be executed: firstly rotate along a first rotation direction and a first rotation speed for a first predetermined time, then rotate along a second rotation direction opposite to the first rotation direction and a second rotation speed for a second predetermined time, then rotate along the first rotation direction and a third rotation speed for a third predetermined time, and finally rotate along the second rotation direction and a fourth rotation speed for a fourth predetermined time; wherein the first rotation speed and the third rotation speed are different in magnitude, and the second rotation speed and the fourth rotation speed are different in magnitude.

[0007] As an improvement, a blowing port is provided on the side wall of the cleaning tank, and a fan is provided on the outer wall of the cleaning tank which can blow air into the cleaning tank through the blowing port. When the dishwasher is executing a cleaning program, if it is detected that the amount of foam generated in the cleaning tank reaches a condition requiring defoaming measures to be implemented, the fan is turned on to blow air into the cleaning tank.

[0008] As a further improvement, a drain outlet and a drain valve are provided at the bottom of the cleaning tank. During the execution of the cleaning program of the dishwasher, if it is detected that the amount of foam in the cleaning tank has reached the condition where defoaming measures need to be performed, the drive motor is first controlled to cyclically perform the defoaming operation for 5 to 6 minutes. If the amount of foam in the cleaning tank still reaches the condition where defoaming measures need to be performed, the drive motor is controlled to stop rotating, and then the drain valve is opened to drain the washing water in the cleaning tank, and then clean water of the same quality as the discharged washing water is re-injected into the cleaning tank.

[0009] When the amount of foam generated in the cleaning tank reaches the condition where defoaming measures need to be taken, any of the following three solutions can be used:

[0010] The first method is to determine the amount of foam generated in the cleaning tank by detecting the speed of the driving motor in real time. When the value of the foam amount generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank has reached the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is determined by the following method:

[0011]

[0012] RT1 is the speed detected by the drive motor at the current moment, RT0 is the initial speed of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial running moment of the drive motor.

[0013] The second method is to determine the amount of foam generated in the cleaning tank by detecting the operating power of the driving motor in real time. When the value of the foam amount generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank has reached the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is determined by the following method:

[0014]

[0015] Wherein, P1 is the operating power detected by the drive motor at the current moment, P0 is the initial operating power of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial operating moment of the drive motor.

[0016] The third method: the amount of foam generated in the cleaning tank is determined by real-time detection of the rotation speed of the spray arm. When the value of the foam amount generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank has reached the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is determined by the following method:

[0017]

[0018] Wherein W1 is the rotation speed detected by the spray arm at the current moment, W0 is the initial rotation speed of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial operation moment of the drive motor.

[0019] The technical solution adopted by the present invention to solve the above-mentioned further technical problems is: a dishwasher, including a cleaning tank, a spray arm arranged in the cleaning tank, a water pump connected to the spray arm, and a driving motor for driving the blades in the water pump to rotate, characterized in that the dishwasher implements the above-mentioned operation control method during the execution of the cleaning program.

[0020] Compared with the prior art, the advantages of the present invention are as follows: a row of lower spray holes for spraying downwards are arranged on the lower surface of the spray arm. Since most of the foam is concentrated at the bottom of the cleaning tank, the water flow sprayed downwards can destroy the foam structure and achieve the effect of defoaming. In addition, when there are a large number of bubbles in the water flow, the driving motor is driven to alternately run at high and low speeds and to control the forward and reverse operation. The internal flow velocity of the water flow changes to generate stress to destroy the bubble structure, thereby utilizing the existing component structure of the dishwasher. The defoaming control method is effective and easy to operate, thereby solving the problem of reduced head caused by foaming and achieving the effect of improving the cleaning ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a dishwasher in an embodiment of the present invention.

[0022] Figure 2 This is a flow chart of a dishwasher operation control method in Embodiment 1 of the present invention.

[0023] Figure 3 This is a timing diagram of the speed of the driving motor changing with time under the foaming condition in the first embodiment of the present invention.

[0024] Figure 4 This is a timing diagram of the operating power of the driving motor changing with time under the foaming condition in the first embodiment of the present invention.

[0025] Figure 5 This is a timing diagram of the operating power of the driving motor changing with time under the foaming condition in the first embodiment of the present invention.

[0026] Figure 6 It is a structural schematic diagram of a dishwasher in the second embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] like Figure 1 The dishwasher shown comprises a cleaning tank 1, a spray arm 2 arranged in the cleaning tank, a water pump 3 connected to the spray arm, and a driving motor 4 for driving the blades in the water pump 3 to rotate. The driving motor 4 is connected to the control circuit board in communication. The control circuit board can collect the rotation speed and real-time operating power of the driving motor, and can also detect the rotation speed of the spray arm through a Hall sensor. The upper surface of the spray arm 2 is provided with a plurality of upper spray holes 21, and the lower surface of the spray arm 2 is also provided with a plurality of lower spray holes 22. During the washing process of the dishwasher, if it is detected that the amount of foam generated in the cleaning tank reaches the condition that a defoaming measure needs to be performed, the driving motor is controlled to perform the following defoaming operation cyclically until the amount of foam generated in the cleaning tank does not reach the condition that a defoaming measure needs to be performed: first rotate along a first rotation direction and a first rotation speed for a first predetermined time, then rotate along a second rotation direction opposite to the first rotation direction and a second rotation speed for a second predetermined time, then rotate along the first rotation direction and a third rotation speed for a third predetermined time, and finally rotate along the second rotation direction and a fourth rotation speed for a fourth predetermined time; wherein the first rotation speed and the third rotation speed are different in magnitude, and the second rotation speed and the fourth rotation speed are different in magnitude. The first speed and the second speed may be the same or different; the third speed and the fourth speed may be the same or different; the first predetermined time, the second predetermined time, the third predetermined time and the fourth predetermined time may be the same or different. In this embodiment, the first predetermined time, the second predetermined time, the third predetermined time and the fourth predetermined time are all 10 seconds, the first speed is 2500 rpm; the second speed is 2500 rpm; the third speed is 2000 rpm; the fourth speed is 2000 rpm. For a specific flow chart, see Figure 2 shown.

[0030] At the initial operation moment of the washing program, the drive motor of the above-mentioned dishwasher runs at a preset constant power. During the washing program, the control circuit board detects the speed of the drive motor in real time every 1 second, and then calculates the amount of foam Q generated in the washing tank by detecting the speed of the drive motor in real time in any of the following three ways:

[0031] The first method: The amount of foam Q generated in the cleaning tank is obtained by the following method:

[0032]

[0033] RT1 is the speed detected by the drive motor at the current moment, RT0 is the initial speed of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial running moment of the drive motor;

[0034] In the above formula for calculating Q, the units of RT1 and RT0 are both rpm, T1 is the current detection time, T0 is the initial running time of the drive motor, and the unit of T1-T0 is accurate to seconds. The calculation formula of Q ignores the unit and only retains the value;

[0035] When it is determined that the value of the foam amount Q generated in the cleaning tank within the set time is greater than the set value, defoaming measures are performed.

[0036] The principle of the above judgment method is: during the washing process of the sink, if the washing water in the washing tank bubbles, the medium density of the washing water will decrease, the working capacity of the water pump blades will decrease, and the operating power of the drive motor will decrease. In order to keep the operating power of the drive motor constant, the control circuit board will control the drive motor to increase the speed. As the amount of bubbles continues to increase, the above process is repeated until the drive motor reaches the limit speed. Under the condition of foaming, the timing diagram of the speed of the drive motor changing with time can be seen in Figure 3 As shown. Then, through the above judgment method, the real-time value of the amount of foam Q generated in the cleaning tank can be calculated; if the value of the amount of foam Q generated in the cleaning tank is less than or equal to 5, it indicates that the amount of foam in the cleaning tank is slight and insufficient to implement the defoaming measures. When the value of the amount of foam Q generated in the cleaning tank is greater than 5 within the set time (such as within 1 minute or within 2 minutes), the defoaming measures in this embodiment include spraying water into the cleaning tank by spraying water to the spray arm.

[0037] The second method: The control circuit board detects the operating power of the drive motor in real time every 1 second, and calculates the amount of foam Q generated in the cleaning tank by detecting the real-time operating power of the drive motor in real time. Q is obtained in the following way:

[0038]

[0039] Wherein, P1 is the operating power detected by the drive motor at the current moment, P0 is the initial operating power of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial operating moment of the drive motor.

[0040] The principle of the above judgment method is: during the washing process of the dishwasher, if the washing water in the washing tank bubbles, the medium density of the washing water will decrease, the working capacity of the water pump blades will decrease, and the operating power of the drive motor will decrease. In order to keep the operating power of the drive motor constant, the speed of the drive motor will be increased, and then the operating power of the drive motor will be increased. As the amount of bubbles continues to increase, the above process will continue to cycle until the drive motor reaches the limit speed and will no longer increase the speed. Then the operating power of the drive motor will continue to decrease, the foaming phenomenon will intensify, and the operating power of the drive motor will continue to decrease, and the cycle will continue. Under the foaming condition, the timing diagram of the change of the operating power of the drive motor over time can be seen in Figure 4 At this time, the real-time value of the amount of foam Q generated in the cleaning tank can be calculated by the above judgment method; if the value of the amount of foam Q generated in the cleaning tank is less than or equal to 5, it indicates that the amount of foam in the cleaning tank is slight and insufficient to achieve the implementation of defoaming measures. When the value of the amount of foam Q generated in the cleaning tank is greater than 5 within the set time (such as within 1 minute or 2 minutes), it indicates that the amount of foam in the cleaning tank exceeds the threshold and defoaming measures need to be implemented.

[0041] The third method: The control circuit board detects the rotation speed of the spray arm in real time every 1 second through the Hall sensor, and then calculates the amount of foam Q generated in the cleaning tank based on the real-time detected rotation speed of the spray arm. Q is obtained in the following way:

[0042]

[0043] Wherein W1 is the rotation speed detected by the spray arm at the current moment, W0 is the initial rotation speed of the drive motor, which is a preset value; T1 is the current detection moment, and T0 is the initial operation moment of the drive motor.

[0044] The principle of the above judgment method is as follows: during the washing process of the dishwasher, if the washing water in the washing tank bubbles, the medium density of the washing water will decrease, and the operating power of the drive motor will decrease. In order to keep the operating power of the drive motor constant, the speed of the drive motor will be increased, and then the operating power of the drive motor will be increased. As the amount of bubbles continues to increase, the above process will continue to cycle until the drive motor reaches the limit speed and will no longer increase the speed. Then the operating power of the drive motor will continue to decrease, the speed of the spray arm will decrease, the foaming phenomenon will intensify, the operating power of the drive motor will continue to decrease, the speed of the spray arm will continue to decrease, and the cycle will continue. For a timing diagram of the change of the operating power of the drive motor over time under the foaming condition, see Figure 5At this time, the real-time value of the amount of foam Q generated in the cleaning tank can be calculated by the above judgment method; if the value of the amount of foam Q generated in the cleaning tank is less than or equal to 5, it indicates that the amount of foam in the cleaning tank is slight and insufficient to achieve the implementation of defoaming measures. When the value of the amount of foam Q generated in the cleaning tank is greater than 5 within the set time (such as within 1 minute or 2 minutes), it indicates that the amount of foam in the cleaning tank exceeds the threshold and defoaming measures need to be implemented.

[0045] Embodiment 2

[0046] The difference from the first embodiment is that the side wall of the cleaning tank 1 is provided with a blowing port 11, and the outer side wall of the cleaning tank is provided with a fan 5 that can blow air into the cleaning tank through the blowing port, see Figure 6 As shown, during the washing process of the dishwasher, if it is detected that the amount of foam generated in the washing tank reaches the condition requiring defoaming measures, not only the defoaming measures in embodiment 1 are tried, but also the fan is turned on to blow air in the washing tank.

[0047] Embodiment 3

[0048] Different from the first embodiment, a drain port and a drain valve are provided at the bottom of the cleaning tank. During the cleaning process of the dishwasher, if it is detected that the amount of foam in the cleaning tank has reached the condition requiring defoaming measures to be performed, the drive motor is first controlled to cyclically perform the defoaming operation in the first embodiment for 5 to 6 minutes. If the amount of foam in the cleaning tank still reaches the condition requiring defoaming measures to be performed, the drive motor is controlled to stop rotating, and then the drain valve is opened to drain the washing water in the cleaning tank, and then clean water of the same quality as the discharged washing water is re-injected into the cleaning tank.

Claims

1. A method for controlling the operation of a dishwasher, wherein the dishwasher comprises a cleaning tank, a spray arm disposed in the cleaning tank, a water pump connected to the spray arm, and a drive motor for driving blades in the water pump to rotate, wherein the upper surface of the spray arm is provided with a plurality of upper spray holes, and wherein: The lower surface of the spray arm is also provided with a plurality of lower spray holes. When the dishwasher executes a cleaning program, if it is detected that the amount of foam generated in the cleaning tank reaches the condition requiring the execution of defoaming measures, the drive motor is controlled to cyclically execute the following defoaming operations until the amount of foam generated in the cleaning tank does not reach the condition requiring the execution of defoaming measures: first rotate along a first rotation direction and a first rotation speed for a first predetermined time, then rotate along a second rotation direction opposite to the first rotation direction and a second rotation speed for a second predetermined time, then rotate along the first rotation direction and a third rotation speed for a third predetermined time, and finally rotate along the second rotation direction and a fourth rotation speed for a fourth predetermined time; wherein the first rotation speed and the third rotation speed are different in magnitude, and the second rotation speed and the fourth rotation speed are different in magnitude.

2. The operation control method of the dishwasher according to claim 1, characterized in that: The side wall of the cleaning tank is provided with an air blowing port, and the outer wall of the cleaning tank is provided with a fan which can blow air into the cleaning tank through the air blowing port. When the dishwasher is executing a cleaning program, if it is detected that the amount of foam generated in the cleaning tank reaches the condition requiring defoaming measures to be taken, the fan is turned on to blow air into the cleaning tank.

3. The operation control method of the dishwasher according to claim 1, characterized in that: A drain outlet and a drain valve are provided at the bottom of the cleaning tank. During the cleaning process of the dishwasher, if it is detected that the amount of foam in the cleaning tank has reached the condition where defoaming measures need to be taken, the drive motor is first controlled to cyclically perform the defoaming operation for 5 to 6 minutes. If the amount of foam in the cleaning tank still reaches the condition where defoaming measures need to be taken, the drive motor is controlled to stop rotating, and then the drain valve is opened to drain the washing water in the cleaning tank, and then clean water of the same quality as the discharged washing water is re-injected into the cleaning tank.

4. The operation control method of the dishwasher according to claim 1, 2 or 3, characterized in that: The condition that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken is: the amount of foam generated in the cleaning tank is judged by real-time detection of the rotation speed of the driving motor. When the value of the amount of foam generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is judged in the following way: RT1 is the speed detected by the drive motor at the current moment, and RT0 is the initial speed of the drive motor, which is a preset value; T1 is the current detection time, and T0 is the initial operation time of the drive motor.

5. The operation control method of the dishwasher according to claim 1, 2 or 3, characterized in that: The condition that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken is: the amount of foam generated in the cleaning tank is judged by real-time detection of the operating power of the drive motor. When the value of the amount of foam generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is judged in the following way: Where P1 is the operating power detected by the drive motor at the current moment, and P0 is the initial operating power of the drive motor, which is a preset value; T1 is the current detection time, and T0 is the initial operation time of the drive motor.

6. The operation control method of a dishwasher according to claim 1, 2 or 3, characterized in that: The condition that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken is: the amount of foam generated in the cleaning tank is judged by real-time detection of the rotation speed of the spray arm. When the value of the amount of foam generated in the cleaning tank is greater than the set value within the set time, it is considered that the amount of foam generated in the cleaning tank reaches the condition that defoaming measures need to be taken; the amount of foam Q generated in the cleaning tank is judged in the following way: Where W1 is the speed detected by the spray arm at the current moment, and W0 is the initial speed of the drive motor, which is a preset value; T1 is the current detection time, and T0 is the initial operation time of the drive motor.

7. A dishwasher, comprising a cleaning tank, a spray arm disposed in the cleaning tank, a water pump connected to the spray arm, and a drive motor for driving blades in the water pump to rotate, characterized in that: The dishwasher implements the operation control method according to any one of claims 1 to 6 during the execution of the cleaning program.

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