Sewage level detection structure and fabric cleaning machine

Abstract

The invention discloses a sewage level detection structure and a fabric cleaning machine. The sewage level detection structure comprises a metal probe detection unit, a capacitive sensor detection unit, a signal processing module and a control output module, the signal processing module is electrically connected with the metal probe detection unit and the capacitive sensor detection unit and used for processing and comparing a first water level detection signal detected by the metal probe detection unit and a second water level detection signal detected by the capacitive sensor detection unit. Only when the first water level detection signal and the second water level detection signal are greater than or equal to a preset high water level threshold value, the water level detection result is judged as a high water level; and the control output module is electrically connected with the signal processing module and is used for outputting a shutdown control instruction when the water level detection result is high water level. The invention provides a sewage level detection structure and a fabric cleaning machine, which can improve the accuracy and reliability of water level detection and reduce the misjudgment rate.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically to a sewage level detection structure and a fabric cleaning machine. Background Technology

[0002] A fabric cleaning machine is a device specifically designed for cleaning upholstered furniture, carpets, curtains, and other fabric products. It uses a combination of high-pressure water jets and suction to penetrate deep into the fabric fibers, effectively removing stains, dust, and odors. Wastewater generated during the cleaning process is collected in a wastewater tank in real time, preventing secondary pollution and facilitating user cleanup.

[0003] Currently, most fabric cleaning machines on the market use a single metal probe to detect the sewage level. For example, a water-absorbing cleaning device with water level detection function disclosed in Chinese patent number CN202110519242.1 has the metal probe in direct contact with the sewage. After long-term use, the metal probe is easily corroded or scaled due to the adhesion of impurities, which may lead to misjudgment of overflow or delay in shutdown, resulting in low reliability of water level detection. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a sewage water level detection structure and a fabric cleaning machine, which can improve the accuracy and reliability of water level detection and reduce the false judgment rate.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a sewage water level detection structure, including a metal probe detection unit, a capacitive sensor detection unit, a signal processing module and a control output module; The signal processing module is electrically connected to the metal probe detection unit and the capacitive sensor detection unit respectively. It is used to process and compare the first water level detection signal detected by the metal probe detection unit and the second water level detection signal detected by the capacitive sensor detection unit. The water level detection result is determined to be high water level only when both the first water level detection signal and the second water level detection signal are greater than or equal to the preset high water level threshold. The control output module is electrically connected to the signal processing module and is used to output a shutdown control command when the water level detection result is high. The shutdown control command is used to control the fabric cleaning machine to stop running.

[0006] This technical solution provides a wastewater level detection structure that employs a dual detection mode using a metal probe detection unit and a capacitive sensor detection unit. The signal processing module processes and compares the two detection signals, combining the advantages of direct metal probe detection and non-contact capacitive sensor detection. The equipment is only stopped when both detect a high water level, which improves the accuracy and reliability of water level detection and reduces the false judgment rate.

[0007] In a preferred embodiment, the signal processing module includes a signal amplification circuit, a filter circuit, a comparator, and a logic judgment unit connected in sequence. The signal amplification circuit amplifies the first water level detection signal and the second water level detection signal; the filtering circuit filters the amplified first water level detection signal and the second water level detection signal; the comparator compares the filtered first water level detection signal and the second water level detection signal with the high water level threshold respectively to obtain the first comparison result and the second comparison result; the logic judgment unit performs logical operations on the first comparison result and the second comparison result, and judges the water level detection result as high water level only when both the first comparison result and the second comparison result are detection signals greater than the high water level threshold.

[0008] In this technology, the signal processing module amplifies, filters, and compares two water level detection signals through a signal amplification circuit, a filter circuit, a comparator, and a logic judgment unit connected in sequence. It then performs logical judgment on the two comparison results, which can more accurately determine whether the sewage has reached a high water level. The structure is simple and practical.

[0009] In a preferred embodiment, the wastewater level detection structure further includes a calibration module. This module is used to periodically calibrate the metal probe detection unit and the capacitive sensor detection unit, ensuring the long-term detection accuracy of both units. The wastewater level detection structure provided in this technology further improves reliability and ease of maintenance through the configurable calibration module.

[0010] In a preferred embodiment, the wastewater level detection structure further includes a fault diagnosis module. This module outputs a fault alarm signal to prompt the user to perform maintenance when the duration of inconsistency between the first and second water level detection signals exceeds a preset time. The wastewater level detection structure provided in this technology further improves reliability and maintenance convenience through the configurable fault diagnosis module.

[0011] In a preferred embodiment, the metal probe detection unit includes at least two mutually insulated metal probes. The metal probes are made of corrosion-resistant material, which enables the metal probe detection unit to have strong corrosion resistance, avoid electrode failure caused by impurities in sewage, and improve its service life in sewage environments.

[0012] In a preferred embodiment, the corrosion-resistant material is 316L stainless steel or titanium alloy, which has strong corrosion resistance and better stability.

[0013] In a preferred embodiment, the capacitive sensor detection unit is a parallel-plate capacitor or a coaxial cylindrical capacitor, and the detection end of the capacitive sensor detection unit and the high water level detection point of the metal probe detection unit are located at the same horizontal level. In this technology, the capacitive sensor detection unit and the metal probe detection unit detect the high water level together, which helps to improve the accuracy and reliability of water level detection.

[0014] In a preferred embodiment, the detection end of the capacitive sensor detection unit is provided with an insulating layer, which is a corrosion-resistant material layer. This technology, by providing a corrosion-resistant insulating layer at the detection end of the capacitive sensor detection unit, enhances the corrosion resistance of the capacitive sensor detection unit, prevents its failure, and extends its service life.

[0015] In a preferred embodiment, the insulation layer is a tetrafluoroethylene insulation layer, which has a strong anti-corrosion effect.

[0016] A fabric cleaning machine includes a wastewater level detection structure as described in any of the above technical solutions.

[0017] The fabric cleaning machine in this technology uses the aforementioned sewage level detection structure, which can improve the accuracy and reliability of sewage level detection and reduce the false judgment rate.

[0018] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are: The present invention provides a wastewater level detection structure that adopts a dual detection mode of a metal probe detection unit and a capacitive sensor detection unit, and processes and compares the two detection signals through a signal processing module. It combines the advantages of direct detection by the metal probe and non-contact detection by the capacitive sensor. The equipment is only controlled to stop when both detect a high water level, which can improve the accuracy and reliability of water level detection and reduce the false judgment rate.

[0019] A fabric cleaning machine employs the aforementioned wastewater level detection structure, which can improve the accuracy and reliability of wastewater level detection and reduce the false judgment rate.

[0020] In addition, other advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a structural block diagram of a sewage level detection structure in one embodiment of the present invention; Figure 2 This is a structural block diagram of a wastewater level detection structure in another embodiment of the present invention; Figure 3 This is a schematic diagram showing the installation position of the metal probe of the present invention;

[0023] Explanation of reference numerals in the attached figures: 1. Metal probe detection unit; 2. Capacitive sensor detection unit; 3. Signal processing module; 31. Signal amplification circuit; 32. Filtering circuit; 33. Comparator; 34. Logic judgment unit; 4. Control output module; 5. Calibration module; 6. Fault diagnosis module; 100. Mounting bracket; 101. High water level detection point; 102. Low water level detection point; 103. PCBA board. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Reference Figure 1-3 This invention describes a wastewater level detection structure and a fabric cleaning machine according to an embodiment of the present invention. The wastewater level detection structure can be applied to a fabric cleaning machine.

[0027] In one embodiment, such as Figure 1-3 As shown, a wastewater level detection structure includes a metal probe detection unit 1, a capacitive sensor detection unit 2, a signal processing module 3, and a control output module 4. The signal processing module 3 is electrically connected to the metal probe detection unit 1 and the capacitive sensor detection unit 2 respectively. It is used to process and compare the first water level detection signal detected by the metal probe detection unit 1 and the second water level detection signal detected by the capacitive sensor detection unit 2. The water level detection result is determined to be high water level only when both the first water level detection signal and the second water level detection signal are greater than or equal to the preset high water level threshold. The control output module 4 is electrically connected to the signal processing module 3 and is used to output a shutdown control command when the water level detection result is high. The shutdown control command is used to control the fabric cleaning machine to stop running.

[0028] The metal probe detection unit 1, as the main water level detection device, includes at least two mutually insulated metal probes. For example, two metal probes are arranged opposite each other at the high water level detection point 101 of the sewage tank to detect the high water level. Two more metal probes can be added opposite each other at the low water level detection point 102 of the sewage tank to detect the low water level. A pair or more metal probes can also be arranged between the high and low water level detection points to realize the detection of different water levels. The metal probes can be installed on the pluggable mounting bracket 100 at the top of the sewage tank. After the mounting bracket 100 is installed on the sewage tank, the metal probes can be located at the required high water level detection point 101 and low water level detection point 102.

[0029] The capacitive sensor detection unit 2 serves as an auxiliary water level detection device and may include a capacitor. The water level detection end of the capacitor may be located at the same horizontal level as the high water level detection point of the metal probe detection unit 1. When the sewage reaches the height of the high water level detection point, the capacitance value of the capacitor changes, generating a second water level detection signal. The signal processing module 3 is used to receive the first water level detection signal and the second water level detection signal, and after amplifying and filtering the two water level detection signals, compare them with the preset high water level threshold respectively. Finally, it performs logical operations on the comparison results and determines that the water level detection result is high water level only when both water level detection signals are greater than the preset high water level threshold. The control output module 4 receives the water level detection result output by the signal processing module 3. When the water level detection result is high, it outputs a stop control command to the fabric cleaning machine to control the fabric cleaning machine to stop running.

[0030] In a specific implementation, the signal processing module 3 and the control output module 4 can be integrated on the PCBA board 103, which is mounted above the mounting bracket 100 and electrically connected to the metal probe detection unit 1 and the capacitive sensor detection unit 2, respectively.

[0031] This embodiment provides a wastewater level detection structure that employs a dual detection mode of a metal probe detection unit 1 and a capacitive sensor detection unit 2. The signal processing module 3 processes and compares the two detection signals, combining the advantages of direct metal probe detection and non-contact capacitive sensor detection. The equipment is only stopped when both detect a high water level, which improves the accuracy and reliability of water level detection and reduces the false judgment rate.

[0032] In one embodiment, the signal processing module 3 includes a signal amplification circuit 31, a filter circuit 32, a comparator 33, and a logic judgment unit 34 connected in sequence. The signal amplification circuit 31 is used to amplify the first water level detection signal and the second water level detection signal; The filter circuit 32 is used to filter the amplified first water level detection signal and the second water level detection signal; Comparator 33 is used to compare the filtered first water level detection signal and the second water level detection signal with the high water level threshold respectively to obtain the first comparison result and the second comparison result; The logic judgment unit 34 is used to perform logical operations on the first comparison result and the second comparison result. Only when both the first comparison result and the second comparison result are detection signals greater than the high water level threshold, the water level detection result is judged to be a high water level.

[0033] The signal amplification circuit 31 is electrically connected to the metal probe detection unit 1 and the capacitive sensor detection unit 2, respectively, and the logic judgment unit 34 is connected to the control output module 4. The specific structures of the signal amplification circuit 31, the filter circuit 32, the comparator 33, and the logic judgment unit 34 are existing technologies and will not be described in detail here.

[0034] Specifically, the signal processing module 3 amplifies and filters the received first and second water level detection signals through the signal amplification circuit 31 and the filter circuit 32. The comparator 33 compares the processed two water level detection signals with preset thresholds. When both water level detection signals are greater than or equal to the high water level threshold, the logic judgment unit 34 determines that the water level detection result is high and outputs a high level. When the control output module 4 receives the high level output by the control output module 4, it outputs a stop control command to stop the fabric cleaning machine from running.

[0035] In this embodiment, the signal processing module 3, through the signal amplification circuit 31, the filter circuit 32, the comparator 33 and the logic judgment unit 34 connected in sequence, realizes the amplification, filtering and comparison of the two water level detection signals, and performs logical judgment on the two comparison results, which can more accurately determine whether the sewage has reached the high water level. The structure is simple and practical.

[0036] In one embodiment, the wastewater level detection structure further includes a calibration module 5, which is used to periodically calibrate the metal probe detection unit 1 and the capacitive sensor detection unit 2 to ensure the detection accuracy of the two detection units for long-term use.

[0037] The calibration module 5 is connected to the metal probe detection unit 1 and the capacitive sensor detection unit 2 respectively. The calibration module 5 can be a hardware device or circuit used in the prior art for calibrating metal probe water level detection devices and capacitive sensors, which will not be described in detail here.

[0038] Specifically, the calibration of calibration module 5 can include zero-point calibration and sensitivity calibration; zero-point calibration ensures that the output of the two detection units is zero when there is no input or standard reference, which can eliminate the initial error caused by factors such as sensor aging, temperature change, mechanical stress or electronic component drift; sensitivity calibration can correct the sensitivity error caused by sensor aging, environmental interference or manufacturing deviation, and ensure that the measurement results truly reflect the actual situation.

[0039] In practice, the calibration module 5 can automatically calibrate the metal probe detection unit 1 and the capacitive sensor detection unit 2 once a day, once a week, or once a month.

[0040] The wastewater level detection structure provided in this embodiment further improves reliability and maintenance convenience through the configurable calibration module 5.

[0041] In one embodiment, the wastewater level detection structure further includes a fault diagnosis module 6, which is used to output a fault alarm signal to prompt the user to perform maintenance when the duration of the inconsistency between the first water level detection signal and the second water level detection signal exceeds a preset time.

[0042] The fault diagnosis module 6 is connected to the logic judgment unit 34, which records the duration of the inconsistency between the first water level detection signal and the second water level detection signal. When the duration exceeds a preset time, an alarm is triggered.

[0043] In one embodiment of this invention, the fault diagnosis module 6 outputs a fault alarm signal when the first water level detection signal and the second water level detection signal remain inconsistent for more than 5 minutes. Upon receiving the fault alarm signal, the fabric cleaning machine can provide an alarm notification via flashing lights or sound.

[0044] The wastewater level detection structure provided in this embodiment further improves reliability and maintenance convenience by allowing the installation of a fault diagnosis module 6.

[0045] In one embodiment, the metal probe detection unit 1 includes at least two mutually insulated metal probes. The metal probes are made of corrosion-resistant material, which enables the metal probe detection unit 1 to have strong corrosion resistance, avoid electrode failure caused by impurities in sewage, and improve its service life in sewage environment.

[0046] In practice, when the sewage level submerges the metal probe, the conductivity of water causes the probes to conduct, and the metal probe detection unit 1 generates a first water level detection signal.

[0047] In one embodiment, the corrosion-resistant material is 316L stainless steel or titanium alloy, which has strong corrosion resistance and better stability.

[0048] As one implementation method of this embodiment, the metal probe detection unit 1 uses two mutually insulated 316L stainless steel probes. The probes are vertically installed at a preset height position inside the sewage tank. When the water level rises to submerge the probes, the sewage acts as a conductive medium to make the two probes conduct, generating an electrical signal. At this time, the metal probe detection unit 1 can output the first water level detection signal.

[0049] In one embodiment, the capacitive sensor detection unit 2 is a parallel plate capacitor or a coaxial cylindrical capacitor, and the detection end of the capacitive sensor detection unit 2 is at the same horizontal height as the high water level detection point of the metal probe detection unit 1.

[0050] In practice, when the water level in the sewage tank changes, the ratio of air to water between the two plates of the capacitor changes, resulting in a change in capacitance. The capacitive sensor detection unit 2 determines the water level by detecting the change in capacitance.

[0051] In this embodiment, the capacitive sensor detection unit 2 and the metal probe detection unit 1 work together to detect high water levels, which helps to improve the accuracy and reliability of water level detection.

[0052] In one embodiment, the detection end of the capacitive sensor detection unit 2 is provided with an insulating layer, which is a corrosion-resistant material layer.

[0053] This embodiment enhances the corrosion resistance of the capacitive sensor detection unit 2 by providing a corrosion-resistant insulating layer at the detection end of the capacitive sensor detection unit 2, preventing the capacitive sensor detection unit 2 from failing and extending its service life.

[0054] In one embodiment, the insulation layer is a tetrafluoroethylene insulation layer, which has a strong anti-corrosion effect.

[0055] In one embodiment of this invention, the capacitive sensor detection unit 2 uses a coaxial cylindrical capacitor. Its detection end is at the same horizontal level as the high water level detection point of the metal probe detection unit 1, and it is externally wrapped with a polytetrafluoroethylene insulating layer for corrosion protection. When the water level reaches this height, the capacitance of the coaxial cylindrical capacitor changes significantly, generating a corresponding second water level detection signal.

[0056] In another embodiment, the present invention provides a fabric cleaning machine that includes a wastewater level detection structure as described in any of the above embodiments, which can improve the accuracy and reliability of wastewater level detection and reduce the false judgment rate.

[0057] The fabric cleaning machine also includes a main unit, a control board located inside the main unit, and a detachable wastewater tank mounted on the main unit. Specifically, when the fabric cleaning machine is working, the metal probe detection unit 1 and the capacitive sensor detection unit 2 of the aforementioned wastewater level detection structure are located inside the wastewater tank and are electrically connected to the signal processing module 3. The signal processing module 3 is connected to the control output module 4, and the control output module 4 is connected to the control board. When the signal processing module 3 determines that the wastewater has reached a high level, it sends a stop control command to the control board. The control board responds to the stop control command and controls the fabric cleaning machine to stop working.

[0058] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0059] The wastewater level detection structure and other components and operations of the fabric cleaning machine according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] In the description of this specification, references to the terms "embodiment," "specific embodiment," "example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention.

[0062] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined with each other in any suitable manner in one or more embodiments or examples without interference or contradiction.

Claims

1. A wastewater level detection structure, characterized in that: It includes a metal probe detection unit (1), a capacitive sensor detection unit (2), a signal processing module (3), and a control output module (4). The signal processing module (3) is electrically connected to the metal probe detection unit (1) and the capacitive sensor detection unit (2) respectively, and is used to process and compare the first water level detection signal detected by the metal probe detection unit (1) and the second water level detection signal detected by the capacitive sensor detection unit (2), and only when both the first water level detection signal and the second water level detection signal are greater than or equal to the preset high water level threshold, the water level detection result is determined to be high water level; The control output module (4) is electrically connected to the signal processing module (3) and is used to output a shutdown control command when the water level detection result is high water level. The shutdown control command is used to control the fabric cleaning machine to stop running.

2. The wastewater level detection structure according to claim 1, characterized in that: The signal processing module (3) includes a signal amplification circuit (31), a filter circuit (32), a comparator (33), and a logic judgment unit (34) connected in sequence. The signal amplification circuit (31) is used to amplify the first water level detection signal and the second water level detection signal; The filtering circuit (32) is used to filter the amplified first water level detection signal and the second water level detection signal; The comparator (33) is used to compare the filtered first water level detection signal and the second water level detection signal with the high water level threshold respectively to obtain a first comparison result and a second comparison result; The logic judgment unit (34) is used to perform logical operations on the first comparison result and the second comparison result. Only when both the first comparison result and the second comparison result are detection signals greater than the high water level threshold, the water level detection result is determined to be a high water level.

3. The wastewater level detection structure according to claim 2, characterized in that: The wastewater level detection structure also includes a calibration module (5). The calibration module (5) is used to periodically calibrate the metal probe detection unit (1) and the capacitive sensor detection unit (2).

4. The wastewater level detection structure according to claim 2, characterized in that: The wastewater level detection structure also includes a fault diagnosis module (6). The fault diagnosis module (6) is used to output a fault alarm signal when the duration of the inconsistency between the first water level detection signal and the second water level detection signal exceeds a preset time.

5. The wastewater level detection structure according to any one of claims 1 to 4, characterized in that: The metal probe detection unit (1) includes at least two mutually insulated metal probes, which are made of corrosion-resistant material.

6. The wastewater level detection structure according to claim 5, characterized in that: The corrosion-resistant material is 316L stainless steel or titanium alloy.

7. The wastewater level detection structure according to any one of claims 1 to 4, characterized in that: The capacitive sensor detection unit (2) is a parallel plate capacitor or a coaxial cylindrical capacitor, and the detection end of the capacitive sensor detection unit (2) is at the same horizontal height as the high water level detection point of the metal probe detection unit (1).

8. The wastewater level detection structure according to claim 7, characterized in that: The detection end of the capacitive sensor detection unit (2) is provided with an insulating layer, which is a corrosion-resistant material layer.

9. The wastewater level detection structure according to claim 8, characterized in that: The insulating layer is a tetrafluoroethylene insulating layer.

10. A fabric cleaning machine, characterized in that: Includes the wastewater level detection structure as described in any one of claims 1 to 9.

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