Disclosure of Invention
The invention aims to solve the technical problem of providing the water purifier capable of effectively distinguishing condensed water from water leakage so as to avoid false alarm of the condensed water.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a water purifier, includes the casing, sets up filter equipment in the casing and respectively with filter equipment is connected inlet tube, outlet pipe, its characterized in that: the water leakage detection device is arranged in the shell and comprises
The water quality sensor comprises two electrode probes which are arranged in a waterway;
The detection electrode comprises two electrode probes and is arranged at a water leakage detection position in the water purifier;
the control circuit board is electrically connected with the water quality sensor and the detection electrode respectively and is used for comparing detection signals of the water quality sensor and the detection electrode and outputting water leakage detection signals;
one electrode probe of the water quality sensor is electrically connected with one input end of the control circuit board, and the other electrode probe of the water quality sensor is grounded;
one electrode probe of the detection electrode is electrically connected with the other input end of the control circuit board, and the other electrode probe of the detection electrode is grounded.
Simply, the control circuit board includes first detection return circuit, second detection return circuit and controller, the input of first detection return circuit is connected with the electrode probe electricity of water quality sensor, and the input of second detection return circuit is connected with the electrode probe electricity of detection electrode, the output of first detection return circuit, second detection return circuit is connected with the controller electricity respectively.
In order to facilitate water leakage prompt, the control circuit board further comprises a display lamp and/or a buzzer which are electrically connected with the controller.
Preferably, the first detection loop comprises a first resistor and a second resistor, wherein a first end of the first resistor is connected with a power supply, a second end of the first resistor is electrically connected with an electrode probe of the water quality sensor, a first end of the second resistor is electrically connected with a second end of the first resistor, and a second end of the second resistor is electrically connected with one signal input end of the controller;
The second detection loop comprises a third resistor and a fourth resistor, the resistance value of the third resistor is larger than or equal to that of the first resistor, the resistance value of the fourth resistor is equal to that of the second resistor, the first end of the third resistor is connected with a power supply, the second end of the third resistor is electrically connected with an electrode probe of the water quality sensor, the first end of the fourth resistor is electrically connected with the second end of the third resistor, and the second end of the fourth resistor is electrically connected with the other signal input end of the controller.
Preferably, at least two detection electrodes are provided, and each detection electrode is electrically connected with the control circuit board respectively.
Preferably, the water quality sensor is a TDS sensor.
Preferably, the detection electrode is disposed at a water leakage detection position at the bottom of the housing.
Conveniently, the shell is also provided with a setting key electrically connected with the control circuit board.
Compared with the prior art, the invention has the advantages that: the water purifier uses the water quality sensor as a reference electrode to detect signals when water in the waterway is conducted with two probes in the water quality sensor, and meanwhile, the detection electrode is arranged at the water leakage position, so that under the condition that the two electrode probes of the detection electrode are conducted by condensed water or leaked water in a pipeline, the output signal pairs are different, the detection signals of the detection electrode and the signals of the water quality sensor can be compared and calculated, the calculation result can effectively distinguish whether the condensed water flows to the water leakage position or the water leakage condition occurs in the internal device of the water purifier, and whether the water leakage condition occurs or not can be accurately judged, so that false alarm and frequent alarm of false leakage of the condensed water can be avoided, overhaul work is reduced, and the water purifier is more humanized in use.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the water purifier in this embodiment includes a housing, a filter device installed in the housing, a water inlet pipe and a water outlet pipe connected to the filter device, and a water leakage detection device installed in the housing. The filter device can adopt the existing filter device, such as the filter device which can adopt a PP cotton filter element, an active carbon filter element, an ultrafiltration filter element and an active carbon filter element to be sequentially connected, the water inlet pipe is connected with the inlet end of the PP cotton filter element, and the water inlet pipe can be used for connecting a water source. The water outlet pipe is connected to the outlet end of the active carbon filter element, and the water outlet pipe is used for providing purified water resource for users.
The water leakage detection device in the embodiment comprises a water quality sensor 1, a detection electrode 2 and a control circuit board 3. The water quality sensor 1 and the detection electrode 2 comprise two electrode probes.
In this embodiment, the water quality sensor 1 is disposed in a water outlet pipe of the water purifier and is used for detecting the water quality of the water outlet of the water purifier. The water quality sensor in this embodiment employs a TDS sensor for detecting the electrical conductivity of water. The two electrode probes of the water quality sensor 1 are always in a communicated state in the use process of the water purifier, water between the two electrode probes can form a certain equivalent resistance, and the equivalent resistance formed by the water between the two electrode probes also fluctuates along with the change due to the difference of water quality in different areas and the service life of the filtering device, and in the embodiment, the equivalent resistance formed by the water between the two electrode probes is Rw.
The detection electrode 2 is arranged at a water leakage detection position, and the water leakage detection position is usually positioned at the bottom of the water purifier, namely, two electrode probes of the detection electrode 2 are arranged at the water leakage detection position at the bottom of the water purifier. The number of the detection electrodes 2 is determined according to the number of the water leakage detection positions, i.e., one detection electrode 2 is provided for each water leakage detection position. The detection electrode 2 may also be arranged at a sensitive water leakage point. The water purifier can produce the comdenstion water when the work, and when the comdenstion water fell in the water purifier bottom, the inside device of water purifier did not appear leaking the condition, need not to carry out the water leakage warning under this kind of condition. Only when the device inside the water purifier is not tightly sealed or damaged to leak water, the water leakage alarm is needed, so that a user is reminded to maintain, and the problem of larger damage and even safety is avoided.
The control circuit board 3 is electrically connected with the water quality sensor 1 and the detection electrode 2 respectively, and is used for comparing and calculating detection signals of the water quality sensor 1 and the detection electrode 2, and then corresponding detection signals. The control circuit board 3 comprises a first detection loop 31, a second detection loop 32, a controller 33 and an alarm device, wherein the controller 33 can adopt a single chip microcomputer. The input end of the first detection circuit 31 is electrically connected with one electrode probe of the water quality sensor 1, and the other electrode probe of the water quality sensor 1 is grounded. The input end of the second detection circuit 32 is electrically connected to the electrode probe of the detection electrode 2, and the other electrode probe of the detection electrode 2 is grounded. The output ends of the first detection circuit 31 and the second detection circuit 32 are respectively electrically connected with the controller 33. The alarm device can adopt a display lamp 4 and/or a buzzer 5, and the alarm device is electrically connected to the output end of the controller 33. The power supply connection terminal of the controller 33 is connected to a power supply at one end and grounded at the other end.
Specifically, the first detection circuit 31 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to a power supply, a second end of the first resistor R1 is electrically connected to an electrode probe of the water quality sensor 1, a first end of the second resistor R2 is electrically connected to a second end of the first resistor R1, and a second end of the second resistor R2 is electrically connected to a signal input end of the controller 33.
The second detection circuit 32 includes a third resistor R3 and a fourth resistor R4, where the resistance of the third resistor R3 is greater than or equal to the resistance of the first resistor R1, the resistance of the fourth resistor R4 is equal to the resistance of the second resistor R2, the first end of the third resistor R3 is connected to the power supply, the second end of the third resistor R3 is electrically connected to the electrode probe of the water quality sensor 1, the first end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the reverse input end of the controller 33. The resistance of the third resistor R3 in this embodiment is greater than the resistance of the first resistor R1. The resistance of the third resistor R3 is adjusted according to the sensitivity of the water leakage detection device, but if the resistance of the third resistor R3 is determined, the detection sensitivity of the water leakage detection device is determined. The smaller the resistance value of the third resistor R3, the higher the sensitivity.
For the purposes of the following description, the voltage at the second end of the first resistor R1 is defined as V1, the voltage at the second end of the third resistor R3 is defined as V2, and the power supply voltage is VCC.
The water quality sensor 1 is connected into water, so that two electrode probes of the water quality sensor 1 are connected together through tap water to form a loop, and therefore, the voltage value of V1 is the partial pressure of the equivalent resistance Rw of water between the first resistance R1 and the probes of the water quality sensor 1, namely, V1 = VCC, Rw/(Rw + R1), and V1 is corresponding to VCC.
Normally, the water leakage detection position in the water purifier is free of water, namely, the two electrode probes of the detection electrode 2 are not conducted, v2=vcc is generated, and V2> V1 is generated. At this time, the controller 33 converts the voltage signal into the water conductivity data, and then compares and calculates the water conductivity data obtained by the water quality sensor, at this time, the difference calculated by the controller will necessarily exceed the preset water conductivity difference threshold corresponding to the water leakage alarm, and the controller 33 controls not to alarm at this time, i.e. the display lamp 4 is not on, and the buzzer 5 is not loud.
When the condensed water falls to the water leakage detection position, the equivalent resistance R of the condensed water between the two electrode probes of the detection electrode 2 is far greater than the equivalent resistance of the water between the two electrode probes of the water quality sensor 1 because the condensed water is pure water or nearly pure water. Thus v2≡vcc, where V2> V1. The controller 33 converts the voltage signal into water conductivity data, and then compares the water conductivity data with the water conductivity data obtained by the water quality sensor, at this time, the difference value calculated by the controller still does not exceed the preset water conductivity difference value threshold corresponding to the water leakage alarm, and the controller 33 controls not to alarm at this time, namely the display lamp 4 is not on, and the buzzer 5 is not loud.
When water in the waterway falls to a water leakage detection position, namely under the condition that real water leakage occurs, the two electrode probes of the detection electrode 2 are immersed, at the moment, the equivalent resistance R (R) of water between the two electrode probes of the detection electrode 2 is approximately equal to Rw, but because R3 is more than R1 and R2 is equal to R4, V2 is less than V1, the controller 33 converts a voltage signal into water conductivity data, and then compares and calculates the water conductivity data with water conductivity data acquired by the water quality sensor, at the moment, the difference calculated by the controller 33 inevitably exceeds a preset water conductivity difference threshold value corresponding to a water leakage alarm, and the controller 33 controls the display lamp 4 to be lighted, the buzzer 5 to sound to prompt the water leakage. The conductivity difference threshold of the water set in the controller 33 can be adjusted by setting the setting key 6, so that the water leakage sensitivity sensor can be conveniently applied to different water leakage sensitivity environments.
According to the water purifier, on the basis of utilizing the water quality sensor to carry out water quality detection of water, the detection signal of the water quality sensor is utilized as a water leakage detection reference signal, and then water leakage judgment is carried out according to the actual condition of water quality instead of according to the set fixed value, so that the water leakage judgment adaptability is better, meanwhile, the water purifier can effectively distinguish condensed water and the water leakage condition, and further the water leakage false alarm condition under the condensed water condition is avoided, the alarm information is more accurate, the overhaul work is reduced, and the use is more humanized.