CN110604527B - Water inlet control method of dish washing machine and dish washing machine - Google Patents

Abstract

The invention discloses a water inlet control method of a dish washing machine and the dish washing machine. The dishwasher of the invention can meet the control of water inlet time under various water pressure conditions, and can find the fault of the water inlet device of the dishwasher as soon as possible, thereby greatly reducing unnecessary water inlet waiting time, effectively utilizing the working time of the dishwasher and enabling the work of the dishwasher to be more efficient.

Description

A kind of water inlet control method of dishwasher and dishwasher

technical field

The invention belongs to the field of dishwasher equipment, and in particular relates to a water inlet control method for a dishwasher and the dishwasher.

Background technique

Currently, in the technical field of dishwashers, a water level switch or a flow meter is commonly used to control the water inlet of the dishwasher water tank. The working principle of the water level switch to control the water intake of the dishwasher is mainly to detect the water level through the electronic probe, and then cooperate with the peripheral control circuit to realize the control of the water intake. The electronic probe of the water level switch is usually set at the control water level of the water tank, that is, when the water level reaches this position, the water level switch acts, and the peripheral control circuit controls the dishwasher to stop water intake.

The principle of using a flowmeter to control water intake is that the dishwasher enters water through the water inlet valve, and the flowmeter is used to measure the water intake. In this technical solution, the flow meter may include a rotating body and a fixed magnet, as well as a flow detection unit for detecting the number of rotations and an electronic switch for detecting the repeated switching value of the magnet when the rotating body rotates. The electronic switch takes the signal output by the flowmeter as the input signal, and when the count reaches the set switch value, it will control the water inlet valve to stop water intake, that is to say, the flowmeter will control the water inlet valve to stop water intake when the flowmeter reaches the set count value.

However, no matter which of the above water inlet methods is used to control the water inlet of the dishwasher, its working principle is to control the water inlet process according to the current water inlet of the dishwasher. That is to say, as long as the amount of water in the dishwasher does not reach the specified water intake, the dishwasher will continue to feed water. There are great defects in such a control method: First, if the water inlet pressure is very small, it may not be able to complete the entire water inlet washing process within the time range that the user can tolerate, so in the existing water inlet control Under the action of the method, because the water intake has not reached the specified water level, the dishwasher can only continue to feed water until the water volume meets the requirements. Perhaps such a long water intake time is not what the user wants. If the user If you knew that the water intake would take such a long time, you might suspend the water intake and use other washing methods; on the other hand, when the water intake device fails, the existing control method cannot detect the problem in time, so it will also It will affect the user's experience and even cause danger.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a dishwasher water inlet control method and a dishwasher, which can satisfy the control of water inlet time under various water pressure conditions, and can detect as soon as possible The failure of the water inlet device of the dishwasher greatly reduces unnecessary waiting time for water inlet, effectively utilizes the working time of the dishwasher, and makes the dishwasher work more efficiently.

In order to achieve this object, the present invention adopts following technical scheme:

A water inlet control method for a dishwasher includes a plurality of water inlet cycles executed sequentially in the water inlet stage until the water inlet stage ends or the water inlet stage is suspended.

Further, the number of the plurality of water intake cycles is N, and N>1; if the current water level has not reached the preset water level after the dishwasher has completed the last water intake cycle in the water intake phase, an alarm will be issued;

Preferably, the alarm includes a sound/light alarm to prompt water shortage;

Preferably, if the current water level has not reached the preset water level after the last water-inflow cycle of the dishwasher, the dishwasher stops water intake, and the water-intake phase ends.

Further, after the end of each water intake cycle, the water intake stage is suspended, and it is judged whether the current water level reaches the preset water level: if the current water level does not reach the preset water level, the water intake is controlled to enter the next water intake cycle to the washing machine. The water inflow continues into the bowl machine; otherwise, the water inflow is stopped and the water inflow stage ends.

Further, in each water intake cycle, it is judged in real time whether the current water level reaches the preset water level; if the current water level reaches the preset water level, the water intake is stopped, and the water intake phase ends.

Further, the time lengths of at least two water intake cycles in the N water intake cycles are different;

Preferably, the time length of the first water-inflow cycle in the water-inflow stage is the longest;

Further preferably, the number of the water inflow cycles is two, and the time length of the first water inflow cycle is longer than the time length of the second water inflow cycle.

Further, the N water inflow cycles are of the same duration.

A dishwasher, comprising: a control device; the control device controls a plurality of water feeding cycles performed sequentially by the dishwasher in a water feeding phase until the water feeding phase ends or the water feeding phase is suspended.

Further, the control device of the dishwasher includes:

The water level judging device is used to judge whether the current water level in the dishwasher reaches the preset water level;

A clock unit is used to sequentially set multiple water intake cycles during the water intake phase;

The controller is connected with the water level judging device and the clock unit circuit, and the controller controls the water level judging device to judge whether the current water inflow reaches the preset water level after the end of each water inflow cycle until the water inflow stage ends or water phase pause;

Preferably, the water level judging device includes a water level detecting device connected to each other in a circuit for detecting the current water level in the dishwasher, and a judging device for judging whether the current water level reaches a preset water level; the water level detecting device is arranged in the dishwashing machine Inside the machine, the current water level information is sent to the judging device, and the judging device judges whether the current water level reaches the predetermined water level according to the water level information;

Preferably, the water level judging device is arranged inside the dishwasher, and has a signal sending circuit for sending water level information to the controller; the signal sending circuit is a normally open circuit, and only when the water level in the dishwasher reaches a predetermined water level , the signal sending circuit is turned on and closed, and sends a water level information signal to the controller;

Further preferably, the signal sending circuit includes a normally open switch. When the normally open switch is closed, the signal sending circuit is turned on and closed, and sends a water level information signal to the controller; the water level judging device also has The normally open switch is connected to control the float switch of the normally open switch. The float switch includes a float, and the float moves up and down following the rise and fall of the liquid level in the dishwasher. Turn on the switch to connect the signal sending circuit;

Still further preferably, the dishwasher includes an inner container for accommodating tableware, the float switch is arranged at the bottom of the inner container, and the float switch is electrically connected to the controller through a signal line.

Further, the dishwasher further includes a water inlet switch connected to the controller circuit for controlling the opening/closing of the water inlet channel of the dishwasher, and the controller controls the opening/closing of the water inlet switch , after the controller receives the information that the water level judging device judges that the current water level reaches the preset water level, it controls the water inlet switch to close the water inlet waterway;

Preferably, the water intake cycle set by the clock unit includes N water intake cycles, N>1; if the current water level has not yet reached the preset water level after the last water intake cycle of the dishwasher is completed, the controller controls the water intake cycle. The water switch closes the water inlet waterway, and the water inlet stage ends.

Further, the control device also includes an alarm prompting device connected to the controller circuit, and the water intake cycle set by the clock unit includes N water intake cycles, N>1; After the period, if the current water level has not reached the preset water level, the controller will instruct the alarm prompt device to send out an alarm signal;

Further preferably, the alarm signal includes a sound/light alarm to indicate water shortage.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

The water inlet control method of the dishwasher and the dishwasher of the present invention set a plurality of water inlet cycles for the water inlet stage, so that the dishwasher can evaluate the current water inlet status after each water inlet cycle is completed, In this way, it is convenient for the dishwasher to discover the current water inflow problem in a timely manner, to facilitate the control of the water inflow process, and to get rid of the disadvantages of controlling the water inflow solely by the amount of water inflow in the past.

The present invention uses the water level judging device of the dishwasher to judge the current water level after each water intake cycle is completed. If the current water level cannot reach the preset water level after all water intake cycles are completed, it cannot meet If there is a washing requirement in the dishwasher, the dishwasher will notify the user in time through an alarm, or simply stop the water intake, so as to avoid the user's long wait.

In the setting of the water inlet cycle, the present invention adopts two different cycle setting methods: one is to use a cycle setting method with at least two water inlet cycles with different lengths of time; the other is to use the water inlet cycle The length of time is the same as the cycle setting method. These two schemes have their own advantages: the first scheme is more in line with the law of dishwasher water intake, and the number of water intake cycles can be reduced by properly adjusting the length of the first water intake cycle. A better balance is achieved between the number of detection and judgment times and the timely detection of water inflow problems; the other solution is easier to implement for the time control system because of the same period setting time, and its control process is also simpler. Clock units have lower requirements and are therefore less expensive to implement.

The present invention adopts the float switch to judge the water intake by the water level in the dishwasher liner, which not only has high precision, but also uses the float switch to control the closing of the normally open switch of the signal sending circuit to send the water level information signal, The reliability is high, and the result is accurate, and the float switch is usually controlled by weak current, and the working current is mA level, which makes the control device of the entire dishwasher safer and more reliable.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute improper limitations to the present invention. Apparently, the drawings in the following description are only some embodiments, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 is a schematic flow chart of a water inlet control method of a dishwasher according to the present invention;

Fig. 2 is a composition schematic diagram of a control device of a dishwasher of the present invention;

Fig. 3 is a structural schematic diagram of a float switch of a dishwasher according to the present invention.

In the figure: 1, wire; 2, float base; 3, float.

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figures 1 to 3, the present invention discloses a water intake control method for a dishwasher and the dishwasher. The water intake phase includes multiple water intake cycles executed sequentially until the end of the water intake phase or the water intake Stage paused. The dishwasher of the present invention can satisfy the control of the water inlet time under various water pressure conditions, and can detect the failure of the water inlet device of the dishwasher as early as possible, thereby greatly reducing unnecessary waiting time for water inlet, and effectively utilizing the time for washing dishes. The working time of the dishwasher makes the dishwasher work more efficiently.

Example 1

This embodiment provides a water inlet control method for a dishwasher. The water inlet stage includes a plurality of water inlet cycles executed sequentially until the water inlet stage ends or the water inlet stage is suspended. In this embodiment, as shown in Figure 1, the water intake stage is suspended after each water intake cycle, and it is judged whether the current water level reaches the preset water level: if the current water level does not reach the preset water level, the control will The water enters the next water feeding cycle and continues to feed into the dishwasher; otherwise, the water feeding is stopped, and the water feeding stage ends. The present invention actively sets a plurality of water intake cycles, and actively evaluates the current water intake conditions after each water intake cycle, and controls subsequent operations according to the evaluation results. It avoids the disadvantages of the current water inflow control that simply relies on the gap between the water inflow and the target water inflow, and cannot perform early intervention on the overall running time of the dishwasher. The user can find the water inlet fault of the dishwasher as early as possible, and make corresponding adjustments as early as possible according to the current status of the water inlet system.

In this embodiment, if the current water level of the dishwasher has not reached the preset water level after the last water intake cycle of the dishwasher is completed, an alarm will be given; preferably, the alarm includes sound/light alarms to prompt water shortage. The purpose of such settings in this embodiment is to set the longest water intake time for the water intake process of the dishwasher. After all the water intake cycles are completed, compare the current water intake with the preset water level. If still Failure to meet the needs of water intake indicates that there is a problem with the current water intake system, and the problem will be alerted to the user in the form of an alarm, providing the user with an opportunity to actively judge and adjust, instead of still doing the same as the existing dishwasher. Keep the state of flooding, while ignoring the user's subjective feelings.

In this embodiment, if the current water level has not yet reached the preset water level after the last water intake cycle is executed in the water intake phase of the dishwasher; in addition to the above-mentioned alarm action, the dishwasher can also be stopped from water intake, and the control The water intake stage is over, waiting for the user's instructions, and avoiding equipment damage caused by the water intake system being opened for a long time.

As shown in FIG. 1 , the number of the plurality of water intake cycles is N, where N>1. In this embodiment, at least two of the N water inflow cycles have different time lengths; preferably, the first water inflow cycle in the water inflow stage has the longest time length. The reason why the first water intake cycle is set the longest is based on the water intake rules of the dishwasher. The number of water intake cycles can be reduced by appropriately adjusting the length of the first water intake cycle, and a better balance can be achieved between reducing the number of inspections and judgments and discovering water intake problems in time. Further preferably, the number of the water inflow cycles is two, and the time length of the first water inflow cycle is longer than the time length of the second water inflow cycle.

In this embodiment, a variety of schemes can be adopted for setting the duration of the first water intake cycle. Try to set it so that under normal water pressure conditions, the dishwasher reaches the preset water volume and meets the requirements of the dishwasher for dishwashing. water intake time. The duration can be set in various ways, either by setting in the system in advance, or by the user.

In some embodiments, the first water-inflow period is the time required for the water-inflow to reach the preset water-inflow under the actual water-inflow pressure when the dishwasher is working for the first time. The water intake time is set as the first water intake cycle, and the total water intake time and the number of water intake cycles included in the total water intake time are set according to user or system presets. Water intake control for multiple water intake cycles including the first water intake cycle is executed in the subsequent water intake process.

The dishwasher in this embodiment evaluates the current water inlet situation after each water inlet cycle is completed, so that the dishwasher can find the current water inlet problem in a timely manner, and it is convenient to monitor the water inlet process. control, getting rid of the disadvantages of controlling water intake only through water intake in the past.

In this embodiment, in each water intake cycle, it is also possible to monitor in real time whether the current water level reaches the preset water level, and when the water level reaches the preset water level, the water intake switch can be turned off in time to end the water intake process.

Example 2

This embodiment is a supplement to Embodiment 1. The difference between this embodiment and Embodiment 1 is that the number of multiple water intake cycles of the dishwasher is N, and N>1; the length of time for N water intake cycles same. The equal-length water inflow cycle control method adopted in this embodiment is easier to implement for the time control system, and its control process is also simpler. The requirements for the clock unit are relatively low, so the implementation cost is lower

Example 3

As shown in Figure 2 and Figure 3, this embodiment discloses a dishwasher. The dishwasher includes: a control device; the control device implements the water inlet control method as described in the above-mentioned embodiments, and controls multiple water inlet cycles executed sequentially by the dishwasher in the water inlet stage until the water inlet stage ends or the water inlet cycle is completed. The water stage is suspended, and the water inflow process control in the above-mentioned embodiment is completed.

As shown in Figure 2, the control device of the dishwasher in this embodiment includes:

The water level judging device is used to judge whether the current water level in the dishwasher reaches the preset water level;

The clock unit is used to sequentially set multiple water intake cycles during the water intake stage; the water intake cycle includes N water intake cycles, N>1; the clock unit can set the time timer set in the system.

The controller is connected with the water level judging device and the clock unit circuit, and the controller controls the water level judging device to judge whether the current water inflow reaches the preset water level after the end of each water inflow cycle until the water inflow stage ends or The water phase is suspended. The controller can be an integrated circuit or a control chip with logic judgment capability.

The dishwasher also includes a water inlet switch connected to the controller circuit for controlling the opening/closing of the dishwasher water inlet circuit, the controller controls the opening/closing of the water inlet switch, the After the controller receives the information that the water level judging device judges that the current water level has reached the preset water level, it controls the water inlet switch to close the water inlet channel;

In this embodiment, if the current water level has not reached the preset water level after the last water-intake cycle of the dishwasher is completed, the controller controls the water-inlet switch to close the water-inlet channel, and the water-intake phase ends.

In other implementations, the control device of the dishwasher also includes an alarm prompt device connected to the controller circuit not shown in the figure, and the water intake cycle set by the clock unit includes N water intake cycles, N>1; If the current water level does not reach the preset water level after the last water-intake cycle is executed in the water-intake phase of the dishwasher, the controller instructs the alarm prompting device to send out an alarm signal. The alarm signal includes sound/light alarm to prompt water shortage.

As shown in FIG. 2 , the water level judging device in this embodiment includes a water level detecting device for detecting the current water level in the dishwasher and a judging device for judging whether the current water level reaches a preset water level, which are connected with each other in a circuit. The water level detecting device is arranged inside the dishwasher, and sends current water level information to the judging device, and the judging device judges whether the current water level reaches a predetermined water level according to the water level information.

Preferably, the water level judging device is arranged inside the dishwasher, and has a signal sending circuit for sending water level information to the controller; the signal sending circuit is a normally open circuit, and only when the water level in the dishwasher reaches a predetermined water level , the signal sending circuit is turned on and closed, and sends a water level information signal to the controller;

In order to accomplish the purpose of sending water level information signals from the water level judging device and the controller, the signal sending circuit in this embodiment includes a normally open switch. When the normally open switch is closed, the signal sending circuit is turned on and closed, and sends The controller sends a water level information signal.

As shown in Figure 3, the water level judging device in this embodiment has a float switch connected to the normally open switch for controlling the normally open switch, the float switch includes a float 3, and the float 3 follows the liquid in the dishwasher. When the float 3 reaches the predetermined water level, the control closes the normally open switch and turns on the signal sending circuit. The dishwasher includes an inner tank for containing tableware, the float switch is arranged at the bottom of the inner tank, and the float switch is electrically connected to the controller through a wire 1 .

Specifically, the float switch in this embodiment is installed at the bottom of the inner container of the dishwasher, and the float switch is used to detect the level of the water in the inner container and determine whether the amount of water in the inner container meets the set requirement. The float switch is composed of a float 3, a wire 1, a float base 2 and the like. The working principle is that the float switch is installed in the inner tank of the dishwasher, the float 3 contains a magnet, and the water level rises, and the float 3 rises with the water level. The float 3 is equivalent to the water level detection device. When the float 3 rises to the set position, the magnet in the float 3 generates a magnetic field to make the reed switch in the float base 2 close and conduct. One end of the wire 1 is connected to the reed switch, and the other end is connected to the Terminals are connected to the controller. After the conduction, a signal is given to the controller, indicating that the water level has reached the set requirement, and the next step can be taken. Whether the float 3 in this embodiment can be controlled to turn on the magnetic reed switch is equivalent to the judging device in the water level judging device. Therefore, this embodiment completes the functions of water level detection and water level judgment of the water level judging device through the float switch, and controls whether to send water level detection information to the controller according to the water level judging result. The float switch of this embodiment judges the water intake according to the water level in the inner tank, and has high precision. And the float switch is controlled by weak current, and the working current is mA level, which is safe and reliable.

The above embodiments can be implemented individually or in combination. The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can use the technical content of the above prompts to make some changes or modify them into equivalent embodiments with equivalent changes. In essence, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (14)

1. A water inlet control method for a dishwasher, characterized in that the water inlet stage includes a plurality of water inlet cycles executed sequentially until the water inlet stage ends or the water inlet stage is suspended; The number of the plurality of water intake cycles is N, N>1, at least two water intake cycles in the N water intake cycles have different lengths of time, and the first water intake cycle in the water intake stage The length of time is the longest; or, the time lengths of the N water inflow cycles are the same; The length of the first water intake cycle is the time required for the water intake to reach the preset water intake under the actual water intake pressure when the dishwasher is working for the first time; After the end of each water intake cycle, the water intake stage is suspended, and a judgment is made on whether the current water level reaches the preset water level: if the current water level does not reach the preset water level, the water intake is controlled to enter the next water intake cycle into the dishwasher Continue to feed water; otherwise, stop water feeding and the water feeding phase ends. 2 . The water inlet control method of the dishwasher according to claim 1 , wherein an alarm is issued if the current water level does not reach the preset water level after the last water inlet cycle of the dishwasher is completed. 3 . 3 . The method for controlling water intake of the dishwasher according to claim 2 , wherein the alarm includes a sound/light alarm to indicate water shortage. 4 . 4. The water inlet control method of the dishwasher according to claim 2, wherein, if the current water level has not reached the preset water level after the last water inlet cycle of the dishwasher is completed in the water inlet stage; The machine stops water intake, and the water intake phase ends. 5. The water inlet control method of a dishwasher according to any one of claims 2-4, wherein it is characterized in that, in each water inlet cycle, it is judged in real time whether the current water level reaches the preset water level; if the current water level reaches the The preset water level stops water intake, and the water intake phase ends. 6. The water inlet control method of the dishwasher according to claim 2, wherein the number of the water inlet cycles is 2, and the time length of the first water inlet cycle is longer than the second water inlet cycle length of time. 7. A dishwasher, characterized in that it is controlled by the water inflow control method according to any one of claims 1 to 6, and the dishwasher comprises: a control device; the control device controls the dishwasher to sequentially Multiple flooding cycles performed until the flooding phase ends or the flooding phase is suspended; The controls for the dishwasher include: The water level judging device is used to judge whether the current water level in the dishwasher reaches the preset water level. A water level judging device, the water level detecting device is arranged inside the dishwasher, and sends current water level information to the judging device, and the judging device judges whether the current water level reaches a predetermined water level according to the water level information; A clock unit is used to sequentially set multiple water intake cycles during the water intake phase; The controller is connected with the water level judging device and the clock unit circuit, and the controller controls the water level judging device to judge whether the current water inflow reaches the preset water level after the end of each water inflow cycle until the water inflow stage ends or The water phase is suspended. 8. The dishwasher according to claim 7, wherein the control device of the dishwasher comprises: the water level judging device is arranged inside the dishwasher, and has a signal for sending water level information to the controller Sending circuit; the signal sending circuit is a normally open circuit, and only when the water level in the dishwasher reaches a predetermined water level, the signal sending circuit is turned on and closed, and sends a water level information signal to the controller. 9. The dishwasher according to claim 8, wherein the signal sending circuit comprises a normally open switch, and when the normally open switch is closed, the signal sending circuit is turned on and closed, and sends a signal to the controller Water level information signal; the water level judging device also has a float switch connected to the normally open switch for controlling the normally open switch, the float switch includes a float, and the float moves up and down following the rise and fall of the liquid level in the dishwasher, When the float reaches the predetermined water level, the control closes the normally open switch and turns on the signal sending circuit. 10. The dishwasher according to claim 9, characterized in that, the dishwasher comprises an inner tank for containing tableware, the float switch is arranged at the bottom of the inner tank, the float switch is connected with the control The device is electrically connected through a signal line. 11. The dishwasher according to any one of claims 7-10, characterized in that the dishwasher further comprises a circuit connected to the controller for controlling the opening/closing of the water inlet of the dishwasher The water inlet switch, the controller controls the on/off of the water inlet switch, and the controller controls the water inlet switch to close the water inlet channel after receiving the information that the water level judging device judges that the current water level has reached the preset water level. 12. The dishwasher according to claim 11, wherein the water intake cycle set by the clock unit includes N water intake cycles, N>1; , the current water level has not reached the preset water level, the controller controls the water inlet switch to close the water inlet waterway, and the water inlet stage ends. 13. The dishwasher according to claim 12, wherein the control device further includes an alarm prompt device connected to the controller circuit, and the water intake cycle set by the clock unit includes N water intake cycles, N>1 ; If the current water level does not reach the preset water level after the last water intake cycle is executed in the water intake phase of the dishwasher, the controller instructs the alarm prompting device to send an alarm signal. 14 . The dishwasher according to claim 13 , wherein the alarm signal includes a sound/light alarm to indicate water shortage.

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