CN111466849A - A kind of control method and control device for preventing sudden change of gas volume in inner cavity of dishwasher - Google Patents

Abstract

The invention discloses a control method and a control device for preventing a sudden change of the gas volume in the inner cavity of a dishwasher. The method includes the steps: S1. Detecting an event: collecting a lid opening signal, a water inlet signal, a drainage signal and an inner cavity of the dishwasher The water temperature and air temperature data in , according to the opening signal, the water inlet signal, and the drainage signal, determine whether thermal expansion/cold contraction occurs, if no thermal expansion/cold contraction occurs, it will end, and if thermal expansion/cold contraction occurs, continue; S2 , Judgment condition: judge whether the thermal expansion type or cold shrinkage type occurs; S3. Judgment condition: judge the type of motor used in the dishwasher, and the judgment result is a speed-adjustable motor or a non-speed-adjustable motor; S4. Execution task: according to step S2 ‑ The judgment result of S3 selects the execution plan. The invention effectively prevents the loss of parts of the dishwasher caused by thermal expansion and contraction of the inner cavity of the dishwasher, and solves the problem of scalding when the cover is opened.

Description

A kind of control method and control device for preventing sudden change of gas volume in inner cavity of dishwasher

technical field

The invention relates to the technical field of dishwashers, in particular to a control method and a control device for preventing a sudden change in the volume of gas in an inner cavity of a dishwasher.

Background technique

Dishwasher is a device that automatically cleans dishes such as bowls, chopsticks, plates, dishes, knives, forks, etc. Fully automatic dishwashers on the market can be divided into two categories: household and commercial. Domestic fully automatic dishwashers are only suitable for households. There are mainly cabinet type, table top, sink integrated type and integrated type. Commercial dishwashers can be arranged according to their structure. It is divided into five categories: cabinet type, hood type, basket transmission type, belt transmission type and ultrasonic wave. It reduces labor intensity, improves work efficiency, and improves cleanliness and hygiene for cooks in restaurants, hotels, and canteens of government agencies.

Common non-ultrasonic dishwashers include an inner cavity, a water inlet module, a heating module, a spray module, a drainage module and other structures. The tableware is placed in the inner cavity, and the water intake is divided into two types: hot water and cold water. It is obtained by heating by the heating module, and the water inlet and outlet are respectively driven by the motor to drive the water inlet pump and the drain pump; the existing dishwasher inevitably produces a temperature difference in the inner cavity during the cleaning stage, resulting in a sudden change in the volume of the gas in the inner cavity. The reasons are as follows :

During spray cleaning, the water is heated, the water temperature in the inner cavity is high and a large amount of water vapor is generated. At this time, for some reasons (such as adding tableware), the cover is opened halfway, that is, the upper cover is opened, and the air in the inner cavity runs from the upper cover. After closing the top cover, if the hot water is sprayed directly, the cold air in the upper layer will be heated, and the gas will expand rapidly, and the increase of the air pressure in the cavity may open the top cover, which will cause the dishwashing process to be suspended and the hot water to splash out. , or even scald the user's serious injury.

When the hot water is sprayed and the water is changed, the cold water starts to enter. If it is sprayed directly, the gas in the upper part of the inner cavity will be quenched, the volume of the gas in the inner cavity will shrink, and the four walls of the inner cavity will be subjected to a certain atmospheric pressure, causing the bottom of the upper cover to collapse. shrinkage and lumen deformation.

In view of this, the inventors have conducted in-depth research on the problem of thermal expansion and contraction of dishwashers, and proposed a control method and control device that can avoid sudden changes in the volume of the inner cavity.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a control method and a control device for preventing a sudden change in the volume of the gas in the inner cavity of the dishwasher, so as to prevent the loss of parts of the dishwasher caused by thermal expansion and contraction of the inner cavity of the dishwasher, and solve the problem of opening The problem of burns when covering.

To achieve the above object, the technical scheme adopted in the present invention is:

A control method for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher, comprising the following steps:

S1. Detection event: Collect the lid opening signal, water inlet signal, drainage signal, and water temperature and air temperature data in the inner cavity of the dishwasher, and judge whether thermal expansion/cold contraction occurs according to the lid opening signal, water inlet signal, and drainage signal. , if no thermal expansion/cold contraction occurs, it will end, and if thermal expansion/cold contraction occurs, it will continue;

S2. Judgment conditions: judging whether thermal expansion or cold shrinkage occurs;

S3. Judgment condition: judging the type of motor used by the dishwasher, and the judgment result is a speed-adjustable motor or a non-speed-adjustable motor;

S4. Execution task: select one or more of the following execution schemes according to the judgment results of steps S2-S3:

A. If it is judged to be a thermal expansion type and adjustable speed motor, control the motor to spray at a low speed for a certain period of time;

B. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to wait for a certain time;

C. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to spray intermittently;

D. If it is judged as thermal expansion type, speed-adjustable motor or non-speed-adjustable motor, drain the hot water in the inner cavity and enter cold water;

E. If it is judged to be a cold-shrinking type and a speed-adjustable motor, control the motor to spray at a low speed for a certain period of time;

F. If it is judged to be cold shrink type, speed-adjustable motor or non-speed-adjustable motor, spray while entering water, control the amount of water inflow is always less than or equal to V1, the height of spray water column is always less than or equal to H, and spray for a certain time until the amount of water required for cleaning is completed;

G. If it is a cold-shrinking type, a speed-adjustable motor or a non-speed-adjustable motor, the hot air in the inner cavity is discharged into the cold air.

Further, in the step S1, judging whether thermal expansion/cold contraction occurs according to the cover opening signal and the water intake and drainage signal respectively includes:

If there is a cover opening signal, it is judged that thermal expansion occurs;

If the hot water is discharged and the cold water is fed, it is judged that cold shrinkage has occurred.

Further, before step S4, it also includes step judgment conditions: judging the size of the temperature difference between the water temperature and air temperature, and when performing step S4, the execution plan is also selected and the execution time is determined according to the size of the temperature difference.

Further, in the step S1, the duration information of opening the lid and the water temperature data of closing the lid are also collected, and before step S4, the thermal expansion/cold contraction is also judged according to the duration information of opening the lid, the water temperature data of closing the lid, and the water temperature difference. strength.

A control device for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher, comprising a control module, a door control sensing module, a temperature sensing module, a spraying module, a heating module, a water inlet module, a drainage module, Intake and exhaust module; the door control sensing module is used to collect the opening/closing lid signal of the dishwasher and send it to the control module, and the temperature sensing module is used to collect the air temperature data and water temperature data of the inner cavity and send it to the control module, and the control module It is used to control the switching and operating power of the spray module, heating module, water inlet module, drainage module, air inlet and exhaust module according to the opening/closing cover signal and air temperature and water temperature data.

After the above technical solution is adopted, compared with the prior art, the beneficial effects of the present invention are as follows: the present invention first collects the signal of opening the cover, the signals of hot water and cold water, and judges whether thermal expansion/cold contraction occurs according to these signals, According to the thermal expansion and cold contraction types driven by the adjustable speed motor and the non-adjustable speed motor, the implementation plan is proposed respectively. In the case of non-adjustable speed motors, the thermal expansion and cold shrinkage are controlled separately. The cold shrinkage is controlled by the water intake to limit the spray height, so that the temperature of the upper and middle gas in the inner cavity is slowly consistent with the water temperature. The method of exhausting hot air into cold air can also be used to prevent damage to the dishwasher caused by a sudden drop in the air pressure in the inner cavity. The thermal expansion conditions are different (such as temperature difference, etc.), and four measures are taken to reduce the influence of thermal expansion, and finally make the gas volume. In the absence of sudden changes, the adjustable speed motor can also adopt all the implementation schemes of the non-adjustable speed motor, thus solving the problem of thermal expansion and contraction caused by various reasons in the inner cavity of the dishwasher, avoiding hot air rushing to the cover and hot water splashing As well as the adsorption of the upper cover and other problems, it prevents the damage to the dishwasher caused by the sudden change of the air pressure in the cavity, prolongs the service life of the dishwasher, and improves the user experience.

Description of drawings

FIG. 1 is a structural diagram of a control device for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher according to the present invention.

Label description

Control Module 1, Door Control Sensing Module 2, Temperature Sensing Module 3, Spray Module 4, Heating Module 5, Water Inlet Module 6, Drainage Module 7, Air Intake and Exhaust Module 8

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Referring to Table 1 below, the present invention discloses a control method and control device for preventing a sudden change in the volume of gas in a dishwasher cavity, comprising the following steps:

S1. Detection event: Collect the lid opening signal, water inlet signal, drainage signal, and water temperature and air temperature data in the inner cavity of the dishwasher, and judge whether thermal expansion/cold contraction occurs according to the lid opening signal, water inlet signal, and drainage signal. , if there is no thermal expansion/cold contraction, it will end, and if thermal expansion/cold contraction occurs, it will continue; the judgment process specifically includes: 1. If there is a lid opening signal, it is judged that thermal expansion occurs; 2. If the hot water is discharged and the inlet Cold water signal, it is judged that cold shrinkage occurs. In this step, the information on the duration of opening the lid and the data on the water temperature when the lid is closed can also be collected, and the thermal expansion intensity can be judged according to the information on the duration of opening the lid, the data on the water temperature when the lid is closed, and the difference between the water and temperature. When judging the degree of thermal expansion, it can also be judged according to the time of opening the lid and the water temperature parameters when the lid is closed. The higher the water temperature, the greater the temperature difference between it and the outside air temperature, resulting in more serious thermal expansion.

S2. Judgment condition: judging whether the thermal expansion type or the cold shrinkage type occurs; this adjustment can be obtained according to the judgment result of step S1;

S3. Judgment condition: judging the type of motor used by the dishwasher, and the judgment result is a speed-adjustable motor or a non-speed-adjustable motor;

S4. Execution task: select one or more of the following execution schemes according to the judgment results of steps S2-S3:

A. If it is judged to be a thermal expansion type and adjustable speed motor, control the motor to spray at a low speed for a certain period of time;

B. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to wait for a certain time;

C. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to spray intermittently;

D. If it is judged as thermal expansion type, speed-adjustable motor or non-speed-adjustable motor, drain the hot water in the inner cavity and enter cold water;

E. If it is judged to be a cold-shrinking type and a speed-adjustable motor, control the motor to spray at a low speed for a certain period of time;

F. If it is judged to be cold shrink type, speed-adjustable motor or non-speed-adjustable motor, spray while entering water, control the amount of water inflow is always less than or equal to V1, the height of spray water column is always less than or equal to H, and spray for a certain time until the amount of water required for cleaning is completed;

G. If it is a cold-shrinking type, a speed-adjustable motor or a non-speed-adjustable motor, the hot air in the inner cavity is discharged into the cold air.

Table 1: Implementation plan comparison table

Refer to Table 1 above, implement scheme A or E, the specific operation is to control the motor speed (power) to control the low-speed spray T1 (for example, 20S) time of the spray module, so that the spray height of the water column is not higher than the set threshold H, because The adjustable speed motor can adjust the running speed of the motor, so as long as the speed is controlled, the spraying speed can be controlled. In the case of low-speed spraying, the problems of thermal expansion and cold contraction can be solved at the same time. When thermal expansion, open the cover. Continue to run, the motor drives the water pump to run at a low speed, so that the height of the sprayed water column is low so as not to hit the inner cavity and sputter; in the case of cold shrinkage, the cleaning procedure of the previous round is completed, and the hot water is discharged into the cold water, so that the cold shrinkage occurs. Adopting low-speed spraying to limit the height of the water column can make the temperature of the water vapor reach the same temperature; the “low speed” in the present invention means that the height of the water sprayed by the spray arm cannot reach the upper cover and the four walls, so as to avoid the sputtering of the water column and the air temperature. The sudden change gradually tends to the water temperature. The realization of low speed is to control the operating power of the motor/water pump. For example, control the power of 30% of the normal operation power of the water pump. The actual operating power is subject to the height of the spray water column without sputtering.

Referring to Table 1 above, implementing solution B is the simplest operation, so it is not repeated here.

Refer to Table 1 above, plan C is to perform a short spray, energize the motor for a short time, so that the spray height of the water column is controlled below H, and no sputtering occurs.

Refer to Table 1 above, implement plan D, that is, drain hot water into cold water, turn the thermal expansion problem into cold contraction, and then use cold contraction to completely solve the problem of thermal expansion and cold contraction, such as implementing plan E or F.

Refer to the above table 1, implement plan F, and control the water intake to reach V1 (for example, 560ml) by spraying while feeding the water, stop the water feeding, continue to spray for T1 time (such as 30s), and then spray while feeding the water. Spray until the required amount of water for cleaning (for example, 2.5L) is completed. The key to controlling the amount of water in this scheme is to limit the spray height when the amount of water is not higher than V1 to avoid the gas generated by the quenching of the gas in the upper part of the cavity. Cold shrinkage reduces the atmospheric pressure on the four walls of the inner cavity and solves the problem of collapse of the upper cover and bottom plate;

Refer to Table 1 above, implement plan G, that is, exhaust hot gas into cold gas, so that the high-temperature gas in the inner cavity is no longer cold-shrinked, and the damage to the four walls of the inner cavity and the bottom plate of the upper cover is prevented.

Preferably, before step S4, it also includes step judgment conditions: judging the size of the temperature difference between the water temperature and air temperature, and when performing step S4, the execution plan is also selected according to the size of the temperature difference and the execution time is determined. Waiting time or spraying time.

Preferably, in the step S1, the duration information of opening the lid and the water temperature data of closing the lid are also collected, and before step S4, the thermal expansion intensity is judged according to the duration information of opening the lid, the water temperature data of closing the lid and the water temperature difference.

As shown in FIG. 1 , the present invention also discloses a control device for preventing a sudden change in the volume of gas in the inner cavity of the dishwasher, comprising a control module 1 , a door control sensing module 2 and a temperature sensing module 3 respectively connected to the control module 1 . , spray module 4, heating module 5, water inlet module 6, drainage module 7, air inlet and exhaust module 8; the door control sensing module 2 is used to collect the opening/closing lid signal of the dishwasher and send it to the control module 1 , the temperature sensing module 3 is used to collect the air temperature data and water temperature data of the inner cavity and send them to the control module. , Drainage module 7 , air intake and exhaust module 8 control on-off and running power, and control on-off and running power of adjustable-speed motor/non-debuggable motor in spray module 4 . The spray module 4 generally includes components such as a motor, a water pump, a spray pipe, and a nozzle. The water inlet module 6 and the drainage module 7 have their own water inlet and outlet water paths. The heating module 5 adopts a heating tube, and the control module 1 adopts an existing washing The control board of the bowl machine, the temperature sensing module 3 uses temperature sensors to perform its tasks, and the door control sensing module 2 can use various switch signal sensors. The intake and exhaust module 8 can be satisfied by using a low-cost exhaust fan.

The working process of the above-mentioned control device for preventing a sudden change in the volume of gas in the inner cavity of the dishwasher is as follows:

In the first step, the door control sensing module 2 collects the lid opening signal of the dishwasher and sends it to the control module 1. Since the control module 1 controls the water inlet module 6 and the drainage module 7 to work, it can directly obtain the water inlet and drainage signals, the temperature The sensing module 3 collects the water temperature and air temperature data in the inner cavity and sends it to the control module 1. The control module 1 judges whether thermal expansion/cold contraction occurs according to the cover opening signal and the water inlet and drainage signals, and judges the thermal expansion/cold contraction based on the water temperature difference. strength;

In the second step, the control module 1 determines whether the thermal expansion type or the cold contraction type occurs; this condition can be obtained according to the judgment result of the first step;

In the third step, the control module 1 judges the type of motor used by the dishwasher, and the judgment result is a speed-adjustable motor or a non-speed-adjustable motor;

The fourth step, the control module 1 executes one or more of the above-mentioned schemes A-G according to the judgment results of the second step and the third step:

If scheme A or E is implemented, the specific operation is that the control module 1 sends a control command to the spray module 4 to control its motor speed (power), so as to control the low-speed spray T1 (for example, 20S) time of the spray module 4, so that the water column is sprayed out The height is not higher than the set threshold H.

If scheme B is implemented, the control module 1 controls other modules to stand by.

If scheme C is implemented, the control module 1 sends a control command to the spraying module 4 for short spraying, and energizes the motor for a short time, so that the spray height of the water column is controlled below H to avoid sputtering.

If scheme D is implemented, the control module 1 sends control commands to the drainage module 7 and the water inlet module 6 to drain the hot water and enter the cold water, and turn the thermal expansion problem into cold contraction. The subsequent cold contraction can be used to completely solve the thermal expansion and cooling. abbreviated problems, such as implementing options E or F.

If scheme F is implemented, the control module 1 sends a control command to the spray module 4 and the water inlet module 6 to act, and by the method of spraying while feeding the water, when the water inlet volume reaches V1 (for example, 560ml), the water inlet module 6 stops the feeding. Water, continue to spray for T1 time (such as 30s), and then spray while entering water until the amount of water required for cleaning (such as 2.5L) is completed.

If scheme G is implemented, the control module 1 sends a control command to the air intake and exhaust module 8 to carry out the operation of exhausting hot gas and entering cold air, so that the high temperature gas in the inner cavity is no longer shrunk, and the damage to the four walls of the inner cavity and the bottom plate of the upper cover is prevented.

The control device of the present invention for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher can prevent the loss of parts of the dishwasher caused by thermal expansion and contraction of the inner cavity of the dishwasher through the above working process, and solve the problem of scalding when the cover is opened. .

While the foregoing specification illustrates and describes preferred embodiments of the present invention, it is to be understood that the present invention is not limited to the form disclosed herein and should not be construed as an exclusion of other embodiments, but may be utilized in various other combinations, modifications and environments , and can be modified within the scope of the inventive concept herein, through the above teachings or skills or knowledge in the relevant field. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (5)

1. A control method for preventing a sudden change in gas volume in the inner cavity of a dishwasher, characterized in that, comprising the following steps: S1. Detection event: Collect the lid opening signal, water inlet signal, drainage signal, and water temperature and air temperature data in the inner cavity of the dishwasher, and judge whether thermal expansion/cold contraction occurs according to the lid opening signal, water inlet signal, and drainage signal. , if no thermal expansion/cold contraction occurs, it will end, and if thermal expansion/cold contraction occurs, it will continue; S2. Judgment conditions: judging whether thermal expansion or cold shrinkage occurs; S3. Judgment condition: judging the type of motor used by the dishwasher, and the judgment result is a speed-adjustable motor or a non-speed-adjustable motor; S4. Execution task: select one or more of the following execution schemes according to the judgment results of steps S2-S3: A. If it is judged to be a thermal expansion type and adjustable speed motor, control the motor to spray at a low speed for a certain period of time; B. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to wait for a certain time; C. If it is judged as thermal expansion type, adjustable speed motor or non-adjustable speed motor, control the motor to spray intermittently; D. If it is judged as thermal expansion type, speed-adjustable motor or non-speed-adjustable motor, drain the hot water in the inner cavity and enter cold water; E. If it is judged to be a cold-shrinking type and a speed-adjustable motor, control the motor to spray at a low speed for a certain period of time; F. If it is judged to be cold shrink type, speed-adjustable motor or non-speed-adjustable motor, spray while entering water, control the amount of water inflow is always less than or equal to V1, the height of spray water column is always less than or equal to H, and spray for a certain time until the amount of water required for cleaning is completed; G. If it is a cold-shrinking type, a speed-adjustable motor or a non-speed-adjustable motor, the hot air in the inner cavity is discharged into the cold air. 2. The control method for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher according to claim 1, wherein in the step S1, it is determined whether heat is generated according to the lid opening signal and the water inlet and drain signals, respectively. Expansion/cold contraction specifically includes: If there is a cover opening signal, it is judged that thermal expansion occurs; If the hot water is discharged and the cold water is fed, it is judged that cold shrinkage has occurred. 3. The control method for preventing a sudden change in the volume of gas in the inner cavity of the dishwasher as claimed in claim 1, characterized in that: before step S4, it further comprises a step of judging conditions: judging the size of the temperature difference between water temperature and air temperature, and executing In step S4, the execution scheme is also selected and the execution time is determined according to the magnitude of the temperature difference. 4. The control method for preventing a sudden change in the volume of gas in the inner cavity of the dishwasher according to claim 3, characterized in that: in the step S1, the duration information of opening the lid and the water temperature data of closing the lid are also collected, Before step S4, the thermal expansion/cold contraction intensity is also judged according to the duration information of opening the cover, the water temperature data of closing the cover, and the water temperature difference. 5. A control device for preventing a sudden change in the volume of gas in the inner cavity of a dishwasher, characterized in that it comprises a control module, and a gated induction module, a temperature induction module, a spray module, a heating module, an inlet and a control module respectively connected to the control module. Water module, drainage module, air intake and exhaust module; the door control sensing module is used to collect the opening/closing lid signal of the dishwasher and send it to the control module, and the temperature sensing module is used to collect and send the air temperature data and water temperature data of the inner cavity For the control module, the control module is used to control the switching and operating power of the spray module, heating module, water inlet module, drainage module, air intake and exhaust module according to the opening/closing cover signal and the air temperature and water temperature data.

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