Optical liquid level meter, optical liquid level detection device and household appliance

Abstract

The utility model discloses an optical liquid level meter, an optical liquid level detection device and a household appliance. The optical liquid level meter comprises a measuring device and a fixing device, the measuring device comprises a light source sealing assembly used for sealing a light source array; the detector sealing assembly is used for sealing the detector array; the detector array is used for receiving the preset optical signal emitted by the light source array and converting the preset optical signal into an electric signal; the fixing device is used for fixing the light source sealing assembly and the detector sealing assembly. According to the utility model, the light source and the detector are independently sealed, so that the liquid level meter is prevented from polluting the detected liquid, and the liquid level detection scene of more liquid can be compatible.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level detection, in particular to an optical liquid level meter, an optical liquid level detection device and household electrical appliances. Background Art

[0002] A level meter is a device that measures the height of liquid in a container or environment. It is mainly used in areas that are sensitive to liquid volume, such as food or chemical industries. Typically, the types of level meters include: tuning fork vibration, magnetic levitation, pressure, ultrasonic, sonar wave, magnetic flap, radar, etc.

[0003] Among the existing low-cost level meters, electrode level meters and float level meters are common. Existing level meters are limited by materials and principles, which may make them unusable in some scenarios. For example, in the water tank of a new oven, an electrode level meter will affect the water quality in the water tank and fail to meet food safety requirements; a float level meter will be affected by different water qualities and cause problems, affecting measurement accuracy. Utility Model Content

[0004] The utility model provides an optical liquid level meter, an optical liquid level detection device and household appliances, so as to solve the problem that the existing liquid level meter is limited by materials and principles, which may cause pollution to the measured liquid and make it unusable in some scenarios. The utility model is compatible with more liquid level detection scenarios.

[0005] According to one aspect of the utility model, an optical liquid level meter is provided, comprising: a measuring device and a fixing device; the measuring device comprises: a light source sealing assembly for sealing a light source array; a detector sealing assembly for sealing the detector array; the detector array is used to receive a preset light signal emitted by the light source array and convert the preset light signal into an electrical signal; the fixing device is used to fix the light source sealing assembly and the detector sealing assembly.

[0006] Optionally, the light source sealing assembly includes: a first circuit board, a first wiring harness and a first sealing body; the first circuit board is used for circuit integration of the light source array; the first sealing body is provided with a first wire outlet, and the first sealing body is used to seal the first circuit board and the light source array; the first end of the first wire harness is connected to the light source array, and the second end of the first wire harness is led out from the first wire outlet.

[0007] Optionally, the first sealing body includes a first body and a second body that are detachably spliced ​​and fixed; the first body is used to fix the first circuit board; and the second body is a light-transmitting plate.

[0008] Optionally, the detector sealing assembly includes: a second circuit board, a second wiring harness and a second sealing body; the second circuit board is used for circuit integration of the detector array; the second sealing body is provided with a second wire outlet, and the second sealing body is used for sealing the second circuit board and the detector array; the first end of the second wire harness is connected to the detector array, and the second end of the second wire harness is led out from the second wire outlet.

[0009] Optionally, the second sealing body includes a third body and a fourth body that are detachably spliced ​​and fixed; the third body is used to fix the second circuit board; and the fourth body is a light-transmitting plate.

[0010] Optionally, the fixing device includes: a base and an upper cover; the base is provided with a first card slot and a second card slot, the first card slot is used to fix the light source sealing assembly, and the second card slot is used to fix the detector sealing assembly; the upper cover is provided with a third wire outlet, and the third wire outlet is used to lead out the wiring harness of the light source sealing assembly and the detector sealing assembly.

[0011] According to another aspect of the utility model, an optical liquid level detection device is provided, comprising: a light source array for emitting a preset light signal; a detector array for receiving the preset light signal and converting the preset light signal into an electrical signal; a main control module for outputting a multi-way selection signal, receiving a corresponding electrical signal, and converting the electrical signal into a liquid level value; a multi-way switch, arranged between the main control module and the detector array, the multi-way switch being used to receive the multi-way selection signal and sending the electrical signals detected by the detector array to the main control module one by one.

[0012] Optionally, a single light source in the light source array is arranged in a one-to-one correspondence with a single detector in the detector array.

[0013] Optionally, the light source array and the detector array are installed at the same height within the liquid surface to be measured.

[0014] Optionally, the multiplexer scans the detector array one by one in a top-down or bottom-up order to read the corresponding electrical signals.

[0015] Optionally, the light source array is an infrared light source array; and the detector array is a photodiode array.

[0016] Optionally, the main control module is provided with a storage unit and a comparison unit; the storage unit is used to store the calibration electrical signal obtained by the detector array receiving the preset light signal in the air medium and converting it; the comparison unit is used to compare the electrical signal emitted by any detector in the detector array with the calibration electrical signal, and output the voltage comparison result.

[0017] Optionally, the light source array and the detector array are sealed and fixed using the above-mentioned optical liquid level meter.

[0018] According to another aspect of the utility model, a household appliance is provided, comprising: a water tank, and the above-mentioned optical liquid level meter, or the above-mentioned optical liquid level detection device, the optical liquid level meter is used to detect the liquid level height of the water tank; the optical liquid level detection device is used to detect the liquid level height of the water tank.

[0019] The technical solution of the embodiment of the utility model is to set up a photoelectric liquid level meter, and the optical liquid level meter is provided with a measuring device and a fixing device; the measuring device is provided with a light source sealing component and a detector sealing component, and the light source array and the detector array are independently sealed; the detector array is used to receive a preset light signal emitted by the light source array, and convert the preset light signal into an electrical signal; the fixing device fixes the light source sealing component and the detector sealing component, and when performing liquid level detection, the installation heights of the light source array and the detector array are matched with each other. Liquid level detection is performed by photoelectric detection technology, which gets rid of the defects of traditional electrode type and float type liquid level meters, and solves the problem that the existing liquid level meter is limited by materials and principles, which will cause pollution to the measured liquid and make it unusable in some scenarios. It has a simple structure, low cost, fast measurement speed, will not cause pollution to the measured liquid, and is compatible with more liquid level detection scenarios.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of an optical liquid level meter provided in Embodiment 1 of the utility model;

[0023] Figure 2 A three-dimensional diagram of an optical liquid level meter provided in Embodiment 1 of the utility model;

[0024] Figure 3 for Figure 2 Side view of

[0025] Figure 4 A three-dimensional diagram of a sealing body of an optical liquid level meter provided in the first embodiment of the utility model;

[0026] Figure 5 for Figure 4 Side view of

[0027] Figure 6 A three-dimensional diagram of a sealing body of another optical liquid level meter provided in Embodiment 1 of the present utility model;

[0028] Figure 7 for Figure 6 Side view of

[0029] Figure 8 A three-dimensional diagram of a base of an optical liquid level meter provided in the first embodiment of the utility model;

[0030] Fig. 9 for Figure 8 A top view of

[0031] Fig.10 A three-dimensional diagram of an upper cover of an optical liquid level meter provided in Embodiment 1 of the utility model;

[0032] Fig.11 for Fig.10 Side view of

[0033] Fig.12 for Fig.10 Bottom view of

[0034] Fig.13 for Fig.10 A top view of

[0035] Fig.14 A schematic diagram of the installation structure of a light source and a detector of an optical liquid level meter provided in the first embodiment of the utility model;

[0036] Fig.15 This is a structural schematic diagram of an optical liquid level detection device provided in Example 2 of the utility model.

[0037] Reference numerals:

[0038] 1. Measuring device; 2. Fixing device;

[0039] 110, light source sealing assembly; 210, light source array; 120, detector sealing assembly;

[0040] 220, detector array; 201, base; 202, upper cover; S, light source; T, detector;

[0041] 111. a first circuit board; 112. a first wiring harness; 113. a first sealing body;

[0042] 121. a second circuit board; 122. a second wiring harness; 123. a second sealing body;

[0043] 113A, first body; 113B, second body; 123A, third body; 123B, fourth body;

[0044] 201A, first card slot; 201B, second card slot;

[0045] 202A, third card slot; 202B, fourth card slot; 202C, third wire outlet;

[0046] 100. Main control module; 300. Multi-way switch. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] Embodiment 1

[0050] Figure 1 This is a structural schematic diagram of an optical liquid level meter provided in Example 1 of the utility model. This embodiment can be applied to liquid level detection scenarios with high requirements on water quality. The optical liquid level meter performs liquid level detection or liquid level inclination detection on the measured liquid based on photoelectric detection.

[0051] See also Figure 1As shown, the optical level meter of the present application includes: a measuring device 1 and a fixing device 2. The measuring device 1 includes: a light source sealing assembly 110, which is used to seal the light source array 210; a detector sealing assembly 120, which is used to seal the detector array 220; the detector array 220 is used to receive a preset light signal emitted by the light source array 210 and convert the preset light signal into an electrical signal; the fixing device 2 is used to detachably fix the light source sealing assembly 110 and the detector sealing assembly 120, so that the installation heights of the light source array 210 and the detector array 220 along the vertical direction Y match each other, that is, the detector is located within the radiation range of the corresponding light source.

[0052] In the present application, the light source array 210 is an array structure composed of a plurality of light source arrays arranged in at least two rows and at least one column, and the detector array 220 is an array structure composed of a plurality of detector arrays arranged in at least two rows and at least one column. The light sources in the light source array 210 are arranged in a one-to-one correspondence with the detectors in the detector array 220. The detector is used to receive the light signal emitted by the corresponding light source and convert the light signal into an electrical signal.

[0053] Optionally, the light source array 210 is an infrared light source array. Typically, the infrared light source array may be an infrared LED. A plurality of infrared LED arrays are arranged to form a light source array.

[0054] Optionally, the detector array 220 may be a photodiode array. Typically, the photodiode may be an infrared silicon PIN photodiode. A plurality of infrared silicon PIN photodiode arrays are arranged to form a detector array.

[0055] Specifically, the light source sealing assembly 110 and the detector sealing assembly 120 are fixed with a fixing device 2 to form an optical liquid level meter. When the light source array 210 (for example, an infrared light source array) is powered on, the light source emits a light signal (for example, an infrared light signal) toward the corresponding detector (for example, a photodiode). After receiving the light signal, the detector converts the light signal into an electrical signal. The light source sealing assembly 110 and the detector sealing assembly 120 form an optical liquid level meter and are placed at the liquid level to be measured. The light source reaches the corresponding detector through the air medium or the liquid medium of the liquid level to be measured. The light intensity received by the detector is different, and correspondingly, the voltage amplitude of the electrical signal converted by the detector is different. For example, the greater the light intensity received by the detector, the higher the voltage amplitude of the converted electrical signal. Thus, the liquid level of the liquid level to be measured is identified by detecting the electrical signal.

[0056] See also Figure 2 and Figure 3As shown, the fixing device 2 includes: a base 201 and an upper cover 202. The base 201 and the upper cover 202 can be formed by plastic material. The base 201 is used to fix the lower end of the light source sealing assembly 110 and the detector sealing assembly 120; the upper cover 202 is used to fix the upper end of the light source sealing assembly 110 and the detector sealing assembly 120.

[0057] See also Figure 2 and Figure 3 As shown, the light source sealing assembly 110 includes: a first circuit board 111, a first wiring harness 112 and a first sealing body 113; the first circuit board 111 is used for circuit integration of the light source array 210; the first sealing body 113 is provided with a first wire outlet, and the first sealing body 113 is used to seal the first circuit board 111 and the light source array 210; the first end of the first wiring harness 112 is connected to the light source array 210, the second end of the first wiring harness 112 is led out from the first wire outlet, and the first wiring harness 112 is connected to an external power supply via the first wire outlet.

[0058] See also Figure 2 and Figure 3 As shown, the detector sealing assembly 120 includes: a second circuit board 121, a second wiring harness 122 and a second sealing body 123; the second circuit board 121 is used for circuit integration of the detector array 220; the second sealing body 123 is provided with a second wire outlet, and the second sealing body 123 is used to seal the second circuit board 121 and the detector array 220; the first end of the second wiring harness 122 is connected to the detector array 220, the second end of the second wiring harness 122 is led out from the second wire outlet, and the second wiring harness 122 is connected to the upper controller via the second wire outlet.

[0059] In the present application, the first wiring harness 112 and the second wiring harness 122 can be led out to the external power supply and the upper controller using wires with rubber sleeves, and the lead-out parts need to be fixed and sealed with sealant to prevent water leakage.

[0060] In the present application, the light source array 210 and the detector array 220 on the circuit board are no longer on the central axis of the circuit board, so that staggered arrangements between different columns are achieved.

[0061] See also Figures 4 to 7 As shown, the first sealing body 113 includes a first body 113A and a second body 113B that can be detachably spliced ​​and fixed; the first body 113A is used to fix the first circuit board; the second body 113B is a light-transmitting plate, so that the light signal emitted by the light source array 210 can be projected out through the second body 113B.

[0062] See also Figures 4 to 7As shown, the second sealing body 123 includes a third body 123A and a fourth body 123B that are detachably spliced ​​and fixed; the third body 123A is used to fix the second circuit board; the fourth body 123B is a light-transmitting plate, so that the detector array 220 can receive optical signals.

[0063] The first body 113A and the third body 123A can be formed by plastic materials; the second body 113B and the fourth body 123B can be formed by acrylic materials.

[0064] See also Figures 4 to 7 As shown, the first body 113A and the second body 113B are spliced ​​together to form a sealed shell of the light source sealing assembly 110, which is used to seal the light source array 210 to avoid direct contact between the light source array 210 and the liquid to be measured; the third body 123A and the fourth body 123B are spliced ​​together to form a sealed shell of the detector sealing assembly 120, which is used to seal the detector array 220 to avoid direct contact between the detector array 220 and the liquid to be measured. By using the detachable main body structure as a sealed shell, the light source array and the detector array are independently packaged to avoid contamination of the liquid to be measured by the light source array and the detector array, and the measurement speed is fast, the measurement accuracy is high, and it is compatible with more liquid level detection scenarios.

[0065] See also Figure 8 and Fig. 9 As shown, the base 201 is provided with a first slot 201A and a second slot 201B. The first slot 201A is used to snap-fit ​​and fix the lower end of the light source sealing assembly 110 , and the second slot 201B is used to snap-fit ​​and fix the lower end of the detector sealing assembly 120 .

[0066] See also Fig.10 and Fig.13 As shown, the upper cover 202 is provided with a third card slot 202A, a fourth card slot 202B and a third wire outlet 202C, the third card slot 202A is used to card-connect and fix the upper end of the light source sealing assembly 110, the fourth card slot 202B is used to card-connect and fix the upper end of the detector sealing assembly 120, and the third wire outlet 202C is used to lead out the wiring harnesses of the light source sealing assembly 110 and the detector sealing assembly 120.

[0067] See also Fig.14 As shown, after the light source sealing assembly 110 and the detector sealing assembly 120 are fixed by the base 201 and the upper cover 202, the positions of the light source array 210 and the detector array 220 satisfy that: each group of corresponding light sources S and detectors T match each other in installation height, that is, the detector T is located within the radiation range of the corresponding light source S. Typically, each group of corresponding light sources S and detectors T can be set to have the same installation height.

[0068] Embodiment 2

[0069] Based on the above embodiments, the present application also provides an optical liquid level detection device. This embodiment is suitable for liquid level detection scenarios with high water quality requirements. The optical liquid level detection device performs liquid level detection or liquid level inclination detection on the liquid to be measured based on photoelectric detection technology.

[0070] See also Fig.15 As shown, the optical liquid level detection device of the present application includes: a light source array 210, which is used to emit a preset light signal; a detector array 220, which is used to receive the preset light signal and convert the preset light signal into an electrical signal; a main control module 100, which is used to output a multi-way selection signal, receive a corresponding electrical signal, and convert the electrical signal into a liquid level value; a multi-way switch 300, which is arranged between the main control module 100 and the detector array 220, and the multi-way switch 300 is used to receive the multi-way selection signal and send the electrical signals detected by the detector array 220 to the main control module 100 one by one.

[0071] Optionally, the multi-way switch 300 scans the detectors T in the detector array 220 one by one in a top-down or bottom-up order to read the corresponding electrical signals.

[0072] Optionally, the main control module 100 is provided with a storage unit and a comparison unit; the storage unit is used to store the calibration electrical signal obtained by the detector array 220 receiving the preset light signal and converting it in the air medium; the comparison unit is used to compare the electrical signal emitted by any detector in the detector array 220 with the calibration electrical signal, and output the voltage comparison result. Specifically, the calibration data can be obtained by the following method: the light source array 210 and the detector array 220 are placed in the air medium, the detector array 220 receives the light signal (for example, an infrared light signal) transmitted by the light source array 210 based on the air medium, and converts the light signal into an electrical signal, and the voltage value of the electrical signal converted by the detector array 220 is measured multiple times, and the main control module 100 receives and records the voltage values ​​measured multiple times through an analog-to-digital converter (ADC), and uses the median value or mean value of the voltage values ​​measured multiple times as the voltage value of the calibration electrical signal. The light intensity of the light signal emitted by the light source array 210 reaching the detector array 220 through the liquid medium is lower than the light intensity reaching the detector array 220 through the air medium, and therefore, the voltage value of the electric signal converted by the detector array 220 will also be reduced accordingly. This voltage value will inevitably be lower than the voltage value of the calibrated electric signal pre-stored in the main control module 100. During the liquid level detection process, the comparison unit compares the voltage value of the electric signal emitted by any detector in the detector array 220 with the voltage value of the calibrated electric signal, and outputs the corresponding comparison result.

[0073] See also Figures 2 to 14As shown, the light source array 210 and the detector array 220 can be sealed and fixed using the optical liquid level meter described in the first embodiment, and have the functional modules and beneficial effects of the optical liquid level meter provided in the first embodiment.

[0074] Optionally, the multi-way switch 300 and the detector array 220 are sealed and fixed in the same sealed housing.

[0075] Optionally, the light source array 210 is an infrared light source array. Typically, the infrared light source array may be an infrared LED. A plurality of infrared LED arrays are arranged to form a light source array.

[0076] Optionally, the detector array 220 may be a photodiode array. Typically, the photodiode may be an infrared silicon PIN photodiode. A plurality of infrared silicon PIN photodiode arrays are arranged to form a detector array.

[0077] Optionally, a single light source S in the light source array 210 is arranged in one-to-one correspondence with a single detector T in the detector array 220, so that each set of corresponding light sources S and detectors T match each other in installation height, that is, the detector T is located within the radiation range of the corresponding light source S. Typically, see Fig.14 As shown, each group of corresponding light sources S and detectors T can be set to have the same installation height.

[0078] Optionally, the light source array 210 and the detector array 220 are at the same installation height in the liquid surface to be measured, wherein the installation height may represent the horizontal height of the light source array 210 and the detector array 220 along the vertical direction Y or the immersion depth of the light source array 210 and the detector array 220 in the liquid surface to be measured.

[0079] Specifically, during the liquid level detection process, the light source array 210 and the detector array 220 are immersed in the liquid surface to be tested perpendicular to the water surface, and the main control module 100 sends a multi-way selection signal to the multi-way switch 300, scans and reads the electrical signal of each detector unit one by one, and compares the voltage value of the read electrical signal of each detector unit with the voltage value of the pre-stored calibration electrical signal. If the voltage value of the electrical signal of any detector unit is less than the voltage value of the calibration electrical signal, it is determined that the detector unit is below the liquid surface; if the voltage value of the electrical signal of any detector unit is greater than or equal to the voltage value of the calibration electrical signal, it is determined that the detector unit is above the liquid surface.

[0080] Exemplarily, the detector array 220 is defined to have N detector units, and each detector unit in the detector array 220 is scanned one by one in a bottom-up order. If the i-th detector unit is below the liquid surface and the i+1-th detector unit is above the liquid surface, it can be determined that the liquid surface to be measured is between the i-th detector unit and the i+1-th detector unit, where i is a positive integer greater than or equal to 1 and less than or equal to N-1. By setting a multi-way switch, the signals of multiple detectors in the detector array 220 are input to the main control module 100 in a serial manner, reducing the number of electrical signal transmission lines and simplifying the circuit structure.

[0081] Embodiment 3

[0082] Based on the above-mentioned embodiment 1, embodiment 3 of the present application further provides a household appliance, including: a water tank, and the optical liquid level meter provided in the above-mentioned embodiment 1, wherein the optical liquid level meter is used to detect the liquid level height of the water tank.

[0083] The household appliance of the present application has the functional modules and beneficial effects of the optical liquid level meter as described in the first embodiment, and the same parts are not repeated here.

[0084] In the present application, the household appliances include but are not limited to: water purifiers, water dispensers, electric ovens or other household appliances that require a water tank.

[0085] Embodiment 4

[0086] Based on the above-mentioned embodiment 2, embodiment 4 of the present application further provides a household appliance, including: a water tank, and the optical liquid level detection device provided in the above-mentioned embodiment 2, wherein the optical liquid level detection device is used to detect the liquid level height of the water tank.

[0087] The household appliance of the present application has the functional modules and beneficial effects of the optical liquid level detection device as described in Implementation 2, and the same parts are not repeated here.

[0088] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An optical level meter, characterized in that: include: measuring devices and fixtures; The measuring device comprises: A light source sealing assembly, used for sealing the light source array; A detector sealing assembly, used for sealing the detector array; The detector array is used to receive the preset light signal emitted by the light source array and convert the preset light signal into an electrical signal; The fixing device is used to fix the light source sealing assembly and the detector sealing assembly.

2. The optical liquid level meter according to claim 1, characterized in that: The light source sealing assembly comprises: a first circuit board, a first wiring harness and a first sealing body; The first circuit board is used to perform circuit integration on the light source array; The first sealing body is provided with a first wire outlet, and the first sealing body is used to seal the first circuit board and the light source array; The first end of the first wire harness is connected to the light source array, and the second end of the first wire harness is led out from the first wire outlet.

3. The optical liquid level meter according to claim 2, characterized in that: The first sealing body comprises a first body and a second body which are detachably spliced ​​and fixed; The first body is used to fix the first circuit board; The second body is a light-transmitting plate.

4. The optical liquid level meter according to claim 1, characterized in that: The detector sealing assembly comprises: a second circuit board, a second wiring harness and a second sealing body; The second circuit board is used to perform circuit integration on the detector array; The second sealing body is provided with a second wire outlet, and the second sealing body is used to seal the second circuit board and the detector array; The first end of the second wire bundle is connected to the detector array, and the second end of the second wire bundle is led out from the second wire outlet.

5. The optical liquid level meter according to claim 4, characterized in that: The second sealing body comprises a third body and a fourth body which are detachably spliced ​​and fixed; The third body is used to fix the second circuit board; The fourth body is a light-transmitting plate.

6. The optical liquid level meter according to any one of claims 1 to 5, characterized in that: The fixing device comprises: a base and an upper cover; The base is provided with a first card slot and a second card slot, the first card slot is used to fix the light source sealing assembly, and the second card slot is used to fix the detector sealing assembly; The upper cover is provided with a third wire outlet, and the third wire outlet is used to lead out the wire harnesses of the light source sealing assembly and the detector sealing assembly.

7. An optical liquid level detection device, characterized in that: include: A light source array, used for emitting a preset light signal; A detector array, used to receive the preset optical signal and convert the preset optical signal into an electrical signal; A main control module, used for outputting a multi-channel selection signal, receiving the corresponding electrical signal, and converting the electrical signal into a liquid level value; A multi-way switch, arranged between the main control module and the detector array, the multi-way switch is used to receive the multi-way selection signal and send the electrical signals detected by the detector array to the main control module one by one; The light source array and the detector array are sealed and fixed using the optical liquid level meter described in any one of claims 1 to 6.

8. The optical liquid level detection device according to claim 7, characterized in that: The individual light sources in the light source array are arranged in one-to-one correspondence with the individual detectors in the detector array.

9. The optical liquid level detection device according to claim 7, characterized in that: The light source array and the detector array are at the same installation height in the liquid surface to be measured.

10. The optical liquid level detection device according to claim 7, characterized in that: The multi-way switch scans the detector array one by one in a top-down or bottom-up order to read the corresponding electrical signals.

11. The optical liquid level detection device according to any one of claims 7 to 10, characterized in that: The light source array is an infrared light source array; the detector array is a photodiode array.

12. The optical liquid level detection device according to any one of claims 7 to 10, characterized in that: The main control module is provided with a storage unit and a comparison unit; The storage unit is used to store the calibration electrical signal obtained by the detector array receiving the preset light signal and converting it in the air medium; The comparison unit is used to compare the electrical signal emitted by any detector in the detector array with the calibration electrical signal, and output a voltage comparison result.

13. A household appliance, characterized in that: include: A water tank, and the optical liquid level meter according to any one of claims 1 to 6, or the optical liquid level detection device according to any one of claims 7 to 12; The optical liquid level meter is used to detect the liquid level height of the water tank; The optical liquid level detection device is used to detect the liquid level height of the water tank.

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