CN211741072U - An evaporator scale detection device - Google Patents

Abstract

The utility model discloses an evaporator scale detection device, comprising a visible light source unit, a visible light photoresistor and a detection control unit, wherein the visible light source unit and the visible light photoresistor are installed at the bottom of the evaporator, the detection control unit is electrically connected to the visible light photoresistor, the visible light photoresistor is used to receive the light emitted by the visible light source unit, and the detection control unit converts the analog signal of the visible light photoresistor into a digital signal to obtain an analog-to-digital conversion value for detecting the scale content. The visible light photoresistor receives the light emitted by the visible light source unit to the water, and then the detection control unit performs analog-to-digital conversion, converts the analog signal into a digital signal, obtains the analog-to-digital conversion value, and judges whether the scale content in the evaporator exceeds the standard through the analog-to-digital conversion value.

Description

An evaporator scale detection device

technical field

The utility model belongs to the technical field of electric steam boxes, in particular to an evaporator scale detection device.

Background technique

In the long-term use of household appliances with evaporators such as electric steamers and steam-bake all-in-one machines, water needs to be heated. Users generally use tap water. Because tap water contains minerals, after a long time of use, the internal steam generator Scale is easy to accumulate on the inner wall, which affects the heating efficiency, correspondingly increases the energy consumption, and even causes the waterway to be blocked and affects the normal use of the product. The current general practice is to prompt the user to clean up after using a set time. However, the water quality in different regions is quite different, and the time for the formation of scales of the same quality is also quite different. Only by setting the time to remind for descaling, for areas with high water quality, there will be too much scale. For areas with better water quality, the descaling agent will be wasted because the amount of scale is too small, and the scaling information cannot be accurately prompted. The cost of calculating the scale weight by weighing is too high and the structure is complicated.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to provide an evaporator scale detection device, which can effectively detect and control the scale content in the evaporator.

In order to achieve the above purpose, the present invention first provides an evaporator scale detection device, comprising a visible light source unit, a visible light photoresistor and a detection control unit, the visible light source unit and the visible light photoresistor are installed at the bottom of the evaporator, and the detection control unit and the visible light The photoresistor is electrically connected, the visible light photoresistor is used for receiving the light emitted by the visible light source unit, and the detection control unit converts the analog signal of the visible light photoresistor into a digital signal to obtain the analog-to-digital conversion value for detecting the scale content.

Further, the visible light source unit and the visible light photoresistor are installed on the same side or the opposite side of the bottom of the evaporator.

Further, the visible light source unit is an LED lamp.

Further, the visible light photoresistor is replaced with a visible light photodiode or a visible light phototransistor.

Further, it also includes a storage unit for storing the analog-to-digital conversion value, and the storage unit is electrically connected with the detection control unit.

Further, a display reminder unit is also included, and the display reminder unit is electrically connected with the detection control unit.

Compared with the prior art, the present invention is based on the principle that the more scale the water is turbid, the more attenuation of light in the water, and the weaker the light received by the visible light photoresistor, and the light characteristics of the visible light photoresistor are used, combined with the output to the detection. The signal amplitude of the control unit changes correspondingly, so that the relationship between the degree of turbidity, that is, the scale content and the amplitude of the level can be established. The visible light photoresistor receives the light emitted by the visible light source unit into the water, and then the detection control unit performs analog-to-digital conversion, converts the analog signal into a digital signal, and obtains the analog-to-digital conversion value. The analog-digital conversion value is used to determine whether the scale content in the evaporator is Exceeded.

Description of drawings

FIG. 1 is a schematic structural diagram 1 of an evaporator scale detection device according to an embodiment of the present invention;

2 is a second structural schematic diagram of an evaporator scale detection device according to an embodiment of the present invention;

3 is a circuit diagram of an evaporator scale detection device according to an embodiment of the present invention;

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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.

An embodiment of the present invention provides an evaporator scale detection device, as shown in FIG. 1 , comprising a visible light source unit 1, a visible light photoresistor 2, a detection control unit (not shown), a visible light source unit 1 and a visible light photoresistor 2 is installed at the bottom of the evaporator 3, the detection control unit is electrically connected with the visible light photoresistor 2, the visible light photoresistor 2 is used to receive the light emitted by the visible light source unit 1, and the detection control unit converts the analog signal of the visible light photoresistor 2 into a digital signal to obtain an analog-to-digital conversion value for detecting the scale content.

With the above structure, the visible light photoresistor 2 receives the light emitted by the visible light source unit 1 into the water, and then the detection control unit performs analog-to-digital conversion, converts the analog signal into a digital signal, and obtains the analog-to-digital conversion value, which is then compared with the detection standard threshold. , if the analog-to-digital conversion value is less than the detection standard threshold, it is determined that the scale content of the evaporator exceeds the standard, otherwise it is not exceeded. The detection standard threshold is determined and set according to the internal environment of the specific evaporator and experimental data.

As shown in FIG. 1 , the visible light source unit 1 and the visible light photoresistor 2 are installed on the opposite side of the bottom of the evaporator, as shown in FIG. 2 , they can also be installed on the same side. Because light is scattered in water, the visible light source unit 1 and the visible light photoresistor 2 are installed on the same side or on the opposite side, and the visible light photoresistor 2 can fully receive the light emitted by the visible light source unit 1 into the water, depending on the installation position. , and set the corresponding detection standard threshold. In this way, the installation position of the scale detection device of this embodiment is more flexible, and suitable installation positions can be adapted according to different evaporator structures.

The visible light source unit 1 is an LED lamp, which is durable and has low energy consumption. The stronger the light received by the visible light photoresistor 2, the smaller its own resistance, the greater its level amplitude, and the greater the signal received by the detection control unit. Strong, the visible light photoresistor 2 is extremely sensitive to light, and can also respond to subtle differences in light intensity. Using the visible light photoresistor 2 as the sensing device can improve the detection accuracy. In this embodiment, the visible light photoresistor 2 is replaced with a visible light photodiode or a visible light phototransistor, which can also produce the same technical effect.

It also includes a storage unit (not shown), which is electrically connected to the detection control unit and used for storing the analog-to-digital conversion value converted by the detection control unit.

It also includes a display reminder unit (not shown), which is electrically connected to the detection control unit. In this embodiment, the display reminder unit is a display screen, and the detection control unit transmits the scale detection results to the display screen. Users can observe the results in time. When it exceeds the standard, it will prompt the need for scale cleaning.

The circuit diagram of the first embodiment is shown in Figure 3. The detection control unit drives the electrode tube Q3 at a high level, so that the electrode tube Q3 is saturated and turned on, and the LED lamp works and lights up. The light, resistor R18 and resistor R45 form a voltage divider sampling circuit, and a filter circuit is formed through the resistor R41 and capacitor C19 to generate a sampling signal, and the detection control unit converts the sampling signal into a digital signal through analog-to-digital conversion. The power supply voltage of the circuit is 5V, and the model of the electrode tube Q3 is SS8050.

The detection method of the evaporator scale detection device according to the embodiment of the present invention includes the following steps:

S1, the visible light photoresistor 2 receives the light emitted by the visible light source unit 1 into the water, and then the detection control unit performs analog-to-digital conversion, converts the analog signal into a digital signal, and obtains the analog-to-digital conversion value Vn;

S2, the detection control unit compares the analog conversion value Vn with the detection standard threshold Vs, if Vn<Vs, the scale content exceeds the standard, otherwise, it does not exceed the standard.

When the water boils, the evaporator will deposit scale at the bottom of the evaporator. When the thickness of the scale reaches a certain level, it will fall off from the bottom under the action of boiling bubbles and form tiny scale floats in the water, making the water turbid. , and partially attached to the inner wall of the evaporator. The more turbid the water, the more scale, and the more scale that finally adheres to the inner wall of the evaporator, the more the light is attenuated in the water, and the weaker the visible light photoresistor 2 receives the light. The stronger the light, the smaller the self-resistance is, the photoelectric characteristics of the photoelectric characteristics, combined with the corresponding change of the signal amplitude to the detection control unit, so that the relationship between the degree of turbidity, that is, the scale content and the amplitude of the level can be established.

In this embodiment, the visible light photoresistor 2 is replaced with a visible light photodiode or a visible light phototransistor, which can also produce the same technical effect.

In step S1, it also includes stopping heating after the water boils for a period of time, and the visible light source unit 1 emits light into the water. When the water boils, the scale will mix in the water to make the water turbid, which is helpful to detect the scale content.

In step S2, it also includes recording and storing each analog-to-digital conversion value Vn. If Vn is continuously smaller than Vs and the number of times m reaches a specified value, a reminder is given to clean the scale. The value range of m is 3-10. In this embodiment, the value of m is preferably 5. When Vn is less than Vs for 5 consecutive times, it can be judged that the scale content in the evaporator exceeds the standard and needs to be cleaned in time. This can avoid the chance in a single test, resulting in inaccurate test results, and can also reduce the need for frequent cleaning of scale. Damage to the evaporator and prolong the service life of the evaporator. The detection standard threshold Vs is specifically determined and set according to different evaporators and experimental data, so that the detection standard threshold Vs is targeted and more reasonable.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Changes or substitutions should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (6)

1. An evaporator scale detection device, comprising a visible light source unit, a visible light photoresistor and a detection control unit, the visible light source unit and the visible light photoresistor are installed at the bottom of the evaporator, and the detection control unit and the The visible light photoresistor is electrically connected, the visible light photoresistor is used for receiving the light emitted by the visible light source unit, and the detection control unit converts the analog signal of the visible light photoresistor into a digital signal, and obtains a scale for detecting the scale content. Analog-to-digital conversion value. 2 . The evaporator scale detection device according to claim 1 , wherein the visible light light source unit and the visible light photoresistor are installed on the same side or the opposite side of the bottom of the evaporator. 3 . 3 . The evaporator scale detection device according to claim 1 , wherein the visible light source unit is an LED lamp. 4 . 4 . The evaporator scale detection device according to claim 1 , wherein the visible light photoresistor is replaced by a visible light photodiode or a visible light phototransistor. 5 . 5 . The evaporator scale detection device according to claim 1 , further comprising a storage unit for storing the analog-to-digital conversion value, and the storage unit is electrically connected to the detection control unit. 6 . 6 . The evaporator scale detection device according to claim 1 , further comprising a display reminder unit, the display reminder unit is electrically connected to the detection control unit. 7 .

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