Capacitance-based device for detecting water quality and water level

Abstract

The utility model belongs to the technical field of camping lamps, and discloses a device for detecting water quality and water level based on capacitance, which comprises a water tank main body, a tank cover at the top of the water tank, a water adding pouring cover, a water diversion cover plate and an electrode probe for detecting water quality and water level conditions, and the water tank main body is used for loading water added through the water adding pouring cover and the water diversion cover plate; the water tank upper top tank cover is connected to the water tank upper top and connected with the water adding pouring cover and the water diversion cover plate. The water adding pouring cover is connected through a plastic pin piece; the water diversion cover plate is used for guiding and restraining water flow poured by the water adding pouring cover; the electrode probe comprises an electrode probe positioning piece, a long probe electrode, a short probe electrode and an electrode probe cover plate; and the electrode probe is integrally fixed on a top tank cover of the water tank. According to the utility model, the long probe electrode of the electrode probe is used for real-time capacitance variation acquisition of the water adding amount, the water level height under the current water quality is accurately measured according to the variation trend of the capacitance variation, and the maximum water adding amount of the water tank is limited through the common ground characteristic of the long and short electrodes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric appliance water tank water quality and water level detection, concretely relates to a device based on capacitive water quality and water level detection. BACKGROUND

[0002] With the continuous development of technology, more and more electric appliances involve water use when operating. Due to the beautification requirement of appearance or the limitation of overall equipment structure space, the water tank of most electric appliances is often arranged inside the electric appliance or covered with color, and the water tank cannot be transparentized and visualized, so that the user cannot visually determine the current water storage capacity of the water tank.

[0003] Moreover, with the rapid development of the Internet of Things, the digitization of water quantity is increasingly important, and more real-time detection of the water tank water quantity of the equipment in the cloud is needed to add water in time and maintain the normal operation of the electric equipment. In the current capacitive detection field, the capacitive data under different water qualities at the same height is detected, and the capacitive change value has a large numerical difference, so that the same water level height cannot be achieved through the capacitive change value to realize accurate detection of the water level through capacitive change. UTILITY MODEL CONTENT

[0004] The utility model provides a device based on capacitive water quality and water level detection, which can effectively solve the problems in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a device based on capacitive water quality and water level detection, comprising a water tank main body: a detachable water tank upper top cover is arranged on the top of the water tank main body, the water tank upper top cover is connected with a water pouring cover through a plastic pin, a water guide cover plate is arranged on the opposite side of the water pouring cover, and an electrode probe is fixed on the same reference surface of the water tank upper top cover.

[0006] Preferably, the water tank upper top cover is connected with the water tank upper top and connected with the water pouring cover and the water guide cover plate, the water tank upper top cover is provided with the electrode probe fixed through punching, and the water tank upper top cover, the water pouring cover, the water guide cover plate and the electrode probe are integrally fixed and detachably connected with the water tank main body, so that the user can conveniently clean the tank body environment.

[0007] Preferably, the water pouring cover is connected and fixed on the water tank upper top cover through the plastic pin, and the water pouring cover is opened and closed through the rotating mode relative to the water tank upper top cover, so that the user can conveniently add water.

[0008] Preferably, the water guide cover plate is fixed below the upper top cover of the water tank by interference clamping, and is located between the main body of the water tank and the upper top cover of the water tank to prevent water droplets from splashing during the water filling process from affecting the accuracy of data collection of the electrode probe.

[0009] Preferably, the electrode probe comprises an electrode probe positioning member, a long probe electrode, an electrode probe cover plate and a short probe electrode, the long probe electrode and the short probe electrode are installed in the covered groove positions reserved in the electrode probe positioning member and the electrode probe cover plate, the electrode probe cover plate is locked with the electrode probe positioning member by interference clamping, and the long probe electrode and the short probe electrode are connected by wires to transmit the collected values of the capacitance change to the single-chip microcomputer for processing.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] Due to the electrode probe, the electrode probe design of the double electrode probes with different lengths can be used, the water level capacitance change value at the time of water shortage is calibrated when the long probe electrode contacts water, and the water level capacitance change value of the long probe electrode at the time of full water is calibrated when water reaches the short probe electrode. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute a limitation to the utility model.

[0013] Figure 1 is the structural appearance view of the utility model;

[0014] Figure 2 is the partial structure explosion view of the utility model;

[0015] Figure 3 is the internal section view of the electrode probe mechanism of the utility model;

[0016] Figure 4 is the electrode probe mechanism explosion view of the utility model;

[0017] Figure 5 is the pure water capacitance characteristic change graph of the utility model;

[0018] Figure 6 is the tap water capacitance characteristic change graph of the utility model.

[0019] Reference numerals: 1-Water tank, 2-Electrode probe, 3-Water inlet cover, 4-Top cover of water tank, 5-Water pouring cover, 21-Probe positioning component, 22-Long probe electrode, 23-Electrode probe cover, 24-Short probe electrode. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1-4 As shown, a device for detecting water quality and water level based on capacitive sensing includes a water tank body 1. The top of the water tank body 1 is equipped with a detachable top cover 4. The top cover 4 is connected to a water filling cap 5 via a plastic pin. On the opposite side of the water filling cap 5, there is a water inlet cover 3. On the opposite side of the water inlet cover 3, there is an electrode probe 2 fixed to the reference surface of the top cover 4 in the same water tank.

[0022] The top cover 4 of the water tank is attached to the top of the water tank 1 and connects to the water filling and pouring cover 5 and the water inlet cover 3. The top cover 4 of the water tank can be drilled to fix the electrode probe 2. After the whole device is fixed, it can be completely disassembled from the main body of the water tank 1, which is convenient for users to clean the tank environment on a daily basis.

[0023] The water pouring cover 5 is connected and fixed to the top cover 4 of the water tank by a plastic pin. The water pouring cover 5 can be opened and closed by rotating relative to the top cover 4 of the water tank, which facilitates the user's water filling operation.

[0024] The water inlet cover 3 is fixed to the bottom of the top cover 4 of the water tank by an interference fit. The whole is located between the main body of the water tank 1 and the top cover 4 of the water tank, to prevent water droplets from splashing during the water filling process from affecting the accuracy of data acquisition by the electrode probe 2.

[0025] Electrode probe 2 comprises an electrode probe positioning component 21, a long probe electrode 22, an electrode probe cover plate 23, and a short probe electrode 24. The long probe electrode 22 and the short probe electrode 24 are installed in the pre-reserved closing slots of the electrode probe positioning component 21 and the electrode probe cover plate 23. The electrode probe cover plate 23 is locked to the electrode probe positioning component 21 by an interference fit. By acquiring data from the capacitance channel using the AS9072DT-M chip, the numerical value of the capacitance change of the water in the water tank can be collected.

[0026] Implementation principle: Figure 5 and Figure 6Based on the trend of capacitance change of the long probe electrode (channel 1) and the short probe (channel 2) during the uniform water addition process, the lower inflection point in the figure represents the capacitance value calibration B_short (pure) and B_short (self) at the water shortage level, and the upper inflection point in the figure represents the capacitance value calibration B_full (pure) and B_full (self) at the full water level. The capacitance change of unknown water quality at the lower inflection point is set to the value R_short (not yet), and similarly, the capacitance change of unknown water quality at the upper inflection point is set to the value R_full (not yet). In order to avoid misjudgment of water quality, the fluctuation margin is set to △, and the range is set to L according to the actual water level height.

[0027] according to Figure 5 and Figure 6 Regarding the data characteristics: when an unknown water reaches an inflection point, the change in capacitance of the water quality at each inflection point will satisfy one of the following conditions, as shown in Table 1, which can be used to determine the water quality (where mixed water represents water made by mixing pure water with a certain proportion of tap water).

[0028] Table 1

[0029]

[0030] Mixing water ratio:

[0031] (Test once before water level rises)

[0032] or:

[0033] (Test once before the water level drops)

[0034] Water level detection: Taking tap water as an example: Set the real-time capacitance value for tap water detection to R_real(self), and the current water level height:

[0035]

[0036] The principle for calculating the water level of pure water is the same as above. Since mixed water is mixed in proportion, there is no need to process the Δ fluctuation margin before calculating the water level.

[0037] The embodiment is based on the capacitive sensing detection mode, detects the capacitance change value generated by the water added in the water tank of the electric appliance, and further infers the water quality of the detected added water and the height of the water level in the water tank from the change characteristics of the capacitance detection through a corresponding detection algorithm. The common detection equipment on the market cannot realize the simultaneous detection of water quality and water level. Generally, water quality detection is divided into high-spectrum colorimetric detection and COD oxygen consumption. Both are too expensive in detection and take longer time than the detection time of the patent, and are not suitable for detecting the water quality of the operation of the electric appliance. Moreover, most water level detection adopts mechanical or sound-light detection, which is relatively large in structure compared with the capacitive type, and requires a larger space to achieve the same effect. In comparison, the embodiment is more convenient, efficient, compact in structure and low in cost in the implementation of water quality detection compared with the common water quality and water level detection.

[0038] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for detecting water quality and water level based on capacitive sensing, characterized in that: The water tank body is provided with a detachable upper tank cover on the top of the water tank body, the upper tank cover is connected with a water pouring cover through a plastic pin, the opposite side of the water pouring cover is provided with a water guide cover plate, and the opposite side of the water guide cover plate is provided with an electrode probe fixed on the same reference surface of the water tank upper cover.

2. The device for detecting water quality and water level based on capacitance according to claim 1, characterized in that: The upper tank cover is connected with the water pouring cover and the water guide cover plate, the electrode probe is fixed on the upper tank cover through punching, and the upper tank cover, the water pouring cover, the water guide cover plate and the electrode probe are integrally fixed and detachably connected with the water tank body.

3. The device for detecting water quality and water level based on capacitance according to claim 1, characterized in that: The water pouring cover is connected with the upper tank cover through a plastic pin, and the water pouring cover is opened and closed through rotation relative to the upper tank cover.

4. The device for detecting water quality and water level based on capacitance according to claim 1, characterized in that: The water guide cover plate is fixed below the upper tank cover through interference buckling, and the water guide cover plate is located between the water tank body and the upper tank cover.

5. The device for detecting water quality and water level based on capacitance according to claim 1, characterized in that: The electrode probe comprises an electrode probe positioning element, a long probe electrode, an electrode probe cover plate and a short probe electrode, the long probe electrode and the short probe electrode are installed in the reserved slot of the electrode probe positioning element and the electrode probe cover plate, the electrode probe cover plate is locked with the electrode probe positioning element through interference buckling, and the long probe electrode and the short probe electrode are connected through wires to transmit the collected value of the capacity change to the single-chip microcomputer for processing.

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