Water level detection device and washing machine

Abstract

The utility model relates to the technical field of household appliances, and discloses a water level detection device and a washing machine. The water level detection device comprises a detection cylinder, a floating part and an infrared detection module, the detection cylinder is arranged between a washing machine inner cylinder and a washing machine outer cylinder, the detection cylinder is provided with a water inlet, and the water inlet is communicated with the washing machine outer cylinder; the floating piece is movably arranged in the detection cylinder, and the density of the floating piece is smaller than that of water; the infrared detection module comprises a control circuit board, an infrared signal transmitting end and an infrared signal receiving end, the infrared signal transmitting end is used for transmitting infrared signals to the floating part, and the infrared signal receiving end is used for receiving the infrared signals reflected by the floating part. According to the utility model, the delay problem caused by indirect measurement of the traditional flowmeter is avoided, the real-time detection of the water level is realized, the timeliness of the water level detection is improved, the signal transmission is stable, the anti-interference capability is strong, the accuracy of the water level detection is ensured, and the hysteresis problem caused by the indirect measurement of the traditional flowmeter is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of home appliances, especially to a water level detection device and a washing machine. BACKGROUND

[0002] The washing machine flowmeter reduces waste by precisely controlling water flow, thereby saving water resources. Without a flowmeter, the washing machine will keep filling water until the water level is full, resulting in a large amount of water waste. With a flowmeter, the water inflow can be precisely controlled to reduce waste. The flowmeter ensures the normal progress of the washing program and guarantees the washing effect. By measuring and controlling water flow, the flowmeter can ensure that the water consumption in the washing and rinsing stages is just right, thereby improving the washing effect. Precise control of water flow not only reduces water waste but also reduces energy consumption. Precise control of the flowmeter can protect various components of the washing machine and reduce mechanical wear caused by excessive water use, thereby prolonging the service life of the washing machine.

[0003] Most existing washing machines indirectly detect the water level in the drum through a flowmeter, i.e., the corresponding water level in the drum is calculated based on the water inflow measured by the flowmeter. The water level detection is delayed and not timely enough, and the water level detection result is not accurate enough. In the control application of the water level signal, there is a large hysteresis. SUMMARY

[0004] To solve the above problems, the utility model aims to provide a water level detection device and a washing machine that can realize real-time detection of the water level, improve the timeliness of water level detection, ensure the accuracy of water level detection, and avoid the delay and hysteresis problems caused by indirect measurement of traditional flowmeters.

[0005] To achieve the above-mentioned purpose, the following technical solutions are provided:

[0006] In a first aspect, the utility model provides a water level detection device, comprising:

[0007] A detection drum is arranged between the inner drum and the outer drum of the washing machine. The detection drum is provided with a water inlet. The water inlet is in communication with the outer drum of the washing machine.

[0008] A floating member is movably arranged in the detection drum. The density of the floating member is less than that of water.

[0009] An infrared detection module includes a control circuit board, an infrared signal emitting end, and an infrared signal receiving end. The infrared signal emitting end is used to emit infrared signals to the floating member. The infrared signal receiving end is used to receive the infrared signals reflected by the floating member.

[0010] As an optional solution of the water level detection device provided by the utility model, the water inlet is located at the bottom of the detection drum, and the water inlet is in communication with the bottom of the outer drum of the washing machine.

[0011] As an optional scheme of the water level detection device provided by the utility model, the water inlet is provided with a filter screen.

[0012] As an optional scheme of the water level detection device provided by the utility model, the top of the floating member is provided with an infrared reflection plate.

[0013] As an optional scheme of the water level detection device provided by the utility model, the bottom of the floating member is provided with a counterweight.

[0014] As an optional scheme of the water level detection device provided by the utility model, the detection cylinder is provided with a limiting protrusion, and the floating member can abut against the limiting protrusion.

[0015] As an optional scheme of the water level detection device provided by the utility model, the control circuit board is connected with the upper cover of the washing machine through buckling, and the control circuit board is located between the upper cover of the washing machine and the detection cylinder.

[0016] As an optional scheme of the water level detection device provided by the utility model, the side wall of the detection cylinder is provided with a threading hole, and the circuit of the control circuit board passes through the threading hole.

[0017] As an optional scheme of the water level detection device provided by the utility model, the water level detection device comprises a water level alarm module, and the water level alarm module is used for sending a water level alarm signal.

[0018] In the second aspect, the utility model further provides a washing machine, which comprises a washing machine inner drum, a washing machine outer drum and the above water level detection device.

[0019] The utility model has the advantages of:

[0020] The water level detection device and the washing machine provided by the utility model, through infrared signal emission end emits infrared signal to the floating piece in the detection cylinder, through infrared signal receiving end receives the infrared signal reflected by the floating piece, under the signal processing of the control circuit board, realizes the position detection of the floating piece, because the water inlet of the detection cylinder is communicated with the outer cylinder of the washing machine, the inner cylinder of the washing machine is communicated with the outer cylinder of the washing machine, the water level of the inner cylinder of the washing machine can be obtained through the position detection of the floating piece, avoids the delay problem caused by the indirect measurement of the traditional flow meter, realizes the real-time detection of the water level, improves the timeliness of the water level detection, through the cooperation of the infrared detection module and the floating piece, can accurately capture the water level change, the signal emitted by the infrared signal emission end is received by the receiving end after being reflected by the floating piece, signal transmission is stable, the anti-interference ability is strong, ensures the accuracy of the water level detection, the density of the floating piece is less than water, can freely float with the water level change, ensures the sensitivity and reliability of detection, because the water level detection is directly carried out, avoids the hysteresis problem caused by the indirect measurement of the traditional flow meter, makes the water level signal response more rapid in the control application, improves the overall control performance of the washing machine. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will introduce the drawings needed to be used in the embodiment of the utility model briefly, obviously, the drawings in the following description only are some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to the content of the embodiment of the utility model and these drawings.

[0022] Fig. 1 It is the structure schematic diagram of the washing machine including the water level detection device provided by the embodiment of the utility model;

[0023] Fig. 2 It is the top view schematic diagram of the washing machine including the water level detection device provided by the embodiment of the utility model;

[0024] Fig. 3 It is the sectional view schematic diagram of the washing machine including the water level detection device provided by the embodiment of the utility model;

[0025] Fig. 4 It is the structure schematic diagram of the infrared detection module in the water level detection device provided by the embodiment of the utility model.

[0026] In the drawing:

[0027] 1, detection cylinder;2, floating piece;3, infrared detection module;4, buckle;

[0028] 11, water inlet;12, threading hole;

[0029] 31, control circuit board; 32, infrared signal transmitting end; 33, infrared signal receiving end; 34, connection

[0030] port;

[0031] 100, outer tub of washing machine; 200, inner tub of washing machine; 300, shell of washing machine; 400, upper cover of washing machine. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the embodiments of the utility model will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0033] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0034] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] As Figs. 1 to 4As shown, the embodiment provides a water level detection device, which comprises a detection cylinder 1, a floating member 2 and an infrared detection module 3. The detection cylinder 1 is arranged between the inner cylinder 200 and the outer cylinder 100 of the washing machine, and both the inner cylinder 200 and the outer cylinder 100 are located in the washing machine shell 300. The detection cylinder 1 is provided with a water inlet 11 which is in communication with the outer cylinder 100 of the washing machine. The floating member 2 is movably arranged in the detection cylinder 1, and the density of the floating member 2 is less than that of water. The infrared detection module 3 comprises a control circuit board 31, an infrared signal emitting end 32 and an infrared signal receiving end 33. The infrared signal emitting end 32 is used for emitting infrared signals to the floating member 2, and the infrared signal receiving end 33 is used for receiving the infrared signals reflected by the floating member 2. It can be understood that the control circuit board 31 is provided with a plurality of connection ports 34, and the ports can be connected to various devices. Commonly used connection devices include power supply, signal converter and sensor, etc.

[0036] The infrared signal emitting end 32 emits infrared signals to the floating member 2 in the detection cylinder 1, and the infrared signal receiving end 33 receives the infrared signals reflected by the floating member 2. Under the signal processing of the control circuit board 31, the position of the floating member 2 is detected. Since the water inlet 11 of the detection cylinder 1 is in communication with the outer cylinder 100 of the washing machine, and the inner cylinder 200 of the washing machine is in communication with the outer cylinder 100, the water level in the inner cylinder 200 of the washing machine can be detected by the position of the floating member 2. The delay problem caused by the indirect measurement of the traditional flow meter is avoided, the real-time detection of the water level is realized, the timeliness of the water level detection is improved, and the water level change can be accurately captured through the cooperation of the infrared detection module 3 and the floating member 2. The signal emitted by the infrared signal emitting end 32 is reflected by the floating member 2 and received by the receiving end. The signal transmission is stable, the anti-interference ability is strong, the accuracy of the water level detection is ensured, the density of the floating member 2 is less than that of water, and the floating member 2 can freely float with the change of the water level, so as to ensure the sensitivity and reliability of the detection. Since the water level detection is directly performed, the hysteresis problem caused by the indirect measurement of the traditional flow meter is avoided, the response of the water level signal in the control application is more rapid, and the overall control performance of the washing machine is improved.

[0037] Optionally, the water inlet 11 is located at the bottom of the detection cylinder 1, and the water inlet 11 is in communication with the bottom of the outer cylinder 100 of the washing machine, so that the water level in the detection cylinder 1 can be completely consistent with the water level in the outer cylinder 100 of the washing machine, thereby more accurately reflecting the actual water level change of the outer cylinder 100 of the washing machine, and avoiding errors caused by different water level measurement positions. Since the water inlet 11 is arranged at the bottom, the water in the outer cylinder 100 of the washing machine can quickly enter the detection cylinder 1, ensuring that the water level in the detection cylinder 1 changes synchronously with the water level in the outer cylinder 100 of the washing machine, further improving the real-time performance and response speed of the water level detection. The design of the bottom communication makes the water level change in the detection cylinder 1 almost without delay with the water level change in the outer cylinder 100 of the washing machine, effectively solving the hysteresis problem caused by the flowmeter calculation or signal transmission in the traditional indirect measurement method. The design of the water inlet 11 in communication with the bottom of the outer cylinder 100 of the washing machine is simple and practical, without the need for complex connection structure, facilitating installation and maintenance, and reducing manufacturing cost. The design is suitable for detection requirements of various water levels, whether it is low water level or high water level, accurate detection can be achieved, further improving the applicability and reliability of the device.

[0038] In some embodiments, the water inlet 11 is provided with a filter screen, which can effectively intercept impurities, fibers or other particulate matters in the outer cylinder 100 of the washing machine, avoiding the entry of these impurities into the detection cylinder 1, thereby ensuring the cleanliness of the inside of the detection cylinder 1 and ensuring the accuracy of the water level detection. The filter screen can prevent impurities from clogging the water inlet 11 or affecting the movement of the floating element 2, reducing the failure or damage of the device caused by impurity accumulation, prolonging the service life of the water level detection device. The presence of the filter screen ensures the cleanliness of the water quality in the detection cylinder 1, avoiding the interference of impurities with the infrared detection module 3, thereby improving the stability of infrared signal emission and reception, further improving the reliability of water level detection. Since the filter screen can effectively block impurities, the inside of the detection cylinder 1 is not easy to accumulate dirt, reducing the frequency of cleaning and maintenance, and reducing the use and maintenance cost. During the use of the washing machine, the water may contain detergent residues, clothing fibers and other impurities, and the design of the filter screen enables the device to adapt to complex water quality environment, ensuring the stability and accuracy of water level detection.

[0039] Optionally, the top of the floating member 2 is provided with an infrared reflective plate. The infrared reflective plate provided at the top of the floating member 2 can significantly improve the reflection efficiency of the infrared signal, ensuring that the signal emitted by the infrared signal emitting end 32 can be fully reflected by the reflective plate and accurately received by the infrared signal receiving end 33, thereby improving the sensitivity and accuracy of the water level detection. The design of the infrared reflective plate makes the reflected signal more stable and concentrated, reducing the possibility of signal scattering or attenuation, reducing the interference of external environment (such as water quality, light, etc.) on the detection result, further improving the stability and reliability of the water level detection. The infrared reflective plate floats up and down with the floating member 2, which can always maintain a relatively stable reflection angle with the infrared detection module 3, ensuring accurate infrared signal reflection and reception at different water levels, expanding the application range of the device. Because the infrared reflective plate can provide efficient signal reflection, the design of the infrared detection module 3 can be simplified, and high-precision water level detection can be achieved without complex signal processing circuit, reducing the manufacturing cost. The high-efficiency reflection capability of the infrared reflective plate reduces the power requirement of the infrared signal emitting end 32, reduces the working load of the emitting end, thereby prolonging the service life of the infrared detection module 3.

[0040] In some embodiments, the bottom of the floating member 2 is provided with a counterweight. By providing a counterweight at the bottom of the floating member 2, the center of gravity of the floating member 2 can be lowered, making it more stable in water, avoiding the inclination or shaking of the floating member 2 caused by water flow fluctuation or washing machine vibration, thereby ensuring the accuracy of water level detection. The design of the counterweight makes the floating member 2 quickly respond to water level changes, reducing the delay caused by the inertia of the floating member 2, thereby improving the real-time performance and sensitivity of the water level detection. The weight of the counterweight can be adjusted according to actual needs, so that the floating member 2 can maintain the best buoyancy and stability under different water level conditions, ensuring that the detection device can work reliably in various water level ranges. The counterweight can effectively prevent the floating member 2 from deviating from the normal position due to water flow impact or washing machine vibration, avoiding false detection caused by abnormal position of the floating member 2, further improving the reliability of the water level detection. The design of the counterweight is simple and practical, without complex structure or additional control device, easy to install and adjust, while reducing the manufacturing cost.

[0041] Optionally, the detection cylinder 1 is provided with a limiting protrusion, and the floating element 2 can abut against the limiting protrusion. By arranging the limiting protrusion in the detection cylinder 1, the up-and-down floating range of the floating element 2 can be effectively limited, preventing the floating element 2 from deviating from the normal working area due to excessively high or low water level, and ensuring the stability and reliability of water level detection. The design of the limiting protrusion makes the activity range of the floating element 2 in the detection cylinder 1 more controllable, avoiding the deviation of the infrared signal reflection angle caused by excessive floating of the floating element 2, thereby improving the accuracy of water level detection. The limiting protrusion can prevent the floating element 2 from directly contacting or colliding with the inner wall of the detection cylinder 1, reducing the risk of jamming or damage of the floating element 2, and prolonging the service life of the device. By limiting the activity range of the floating element 2, the limiting protrusion can reduce the friction and wear of the floating element 2 in the detection cylinder 1, further improving the durability and reliability of the device. The design of the limiting protrusion is simple and practical, easy to install and adjust in the detection cylinder 1, while reducing the maintenance requirements caused by excessive activity range of the floating element 2, and reducing the use and maintenance cost.

[0042] In some embodiments, the control circuit board 31 is clamped with the washing machine upper cover 400 through the buckle 4, and the control circuit board 31 is located between the washing machine upper cover 400 and the detection cylinder 1. By clamping the control circuit board 31 with the washing machine upper cover 400 through the buckle 4 design, the installation process is simple and fast, without the need for additional fixing tools or complex structures, reducing the installation difficulty and cost. The control circuit board 31 is located between the washing machine upper cover 400 and the detection cylinder 1, making full use of the limited space inside the washing machine, avoiding the occupation of other areas, and making the overall structure more compact. The buckle 4 design can firmly fix the control circuit board 31, preventing it from shifting or falling off due to vibration or shaking during the operation of the washing machine, thereby ensuring the stable operation of the infrared detection module 3 and improving the reliability of water level detection. The buckle 4 connection method makes it easier to disassemble and replace the control circuit board 31, facilitating subsequent maintenance and repair, and reducing maintenance cost and time. By arranging the control circuit board 31 between the washing machine upper cover 400 and the detection cylinder 1, it can effectively avoid being directly exposed to a humid or high-temperature environment, reducing the damage of environmental factors to the circuit board and prolonging its service life. The control circuit board 31 is close to the detection cylinder 1 and the infrared detection module 3, shortening the signal transmission distance and reducing the possibility of signal attenuation and interference, further improving the accuracy and response speed of water level detection.

[0043] Optionally, the side wall of the detection cylinder 1 is provided with a threading hole 12, and the wires of the control circuit board 31 pass through the threading hole 12. By providing the threading hole 12 on the side wall of the detection cylinder 1, the wires of the control circuit board 31 can pass through the threading hole 12 in an orderly manner, avoiding disordered distribution of the wires, making the internal structure of the device more tidy, and facilitating installation and maintenance. The design of the threading hole 12 can fix the position of the wires, preventing the wires from being worn, pulled or fallen off due to vibration or shaking during the operation of the washing machine, thereby prolonging the service life of the wires and improving the reliability of the device. By arranging the wires through the threading hole 12, the contact between the wires and other components can be reduced, the interference that may be received during signal transmission can be reduced, the stability of signal transmission of the infrared detection module 3 can be ensured, and the accuracy of water level detection can be improved. The design of the threading hole 12 makes the wiring more convenient, and complex operations are not required during installation. At the same time, when the wires need to be replaced or repaired, the wires can be quickly located and operated, reducing the difficulty and cost of maintenance. The threading hole 12 can be designed according to the size of the wires to ensure that the sealing of the detection cylinder 1 is not affected when the wires pass through, avoiding the entry of water flow or moisture into the detection cylinder 1 through the threading hole 12, and protecting the internal elements from damage. By arranging the wires through the threading hole 12, the wires are not exposed or distributed disorderly, making the internal structure of the device more beautiful, and meeting the design trend of modern household appliances.

[0044] In some embodiments, the water level detection device includes a water level alarm module for issuing a water level alarm signal. When the water level exceeds the warning water level or the water inflow is excessive due to the failure of the water inflow valve, the water level alarm module can realize water level alarm, and the control system can correspondingly issue a signal to stop water inflow, and manually or automatically shut off the water source. By setting the water level alarm module, when water level abnormalities (such as excessively high or low water level) are detected, an alarm signal can be issued in time to remind users to take appropriate measures to avoid washing machine failures or safety problems caused by water level abnormalities. The water level alarm module can monitor the water level in real time during the operation of the washing machine to prevent problems such as water overflow caused by excessively high water level or dry burning caused by excessively low water level, significantly improving the safety of the washing machine. The addition of the water level alarm module enables users to promptly understand the water level status of the washing machine without the need for manual inspection, improving the convenience and intelligent level of use and improving the user experience. By issuing a water level alarm signal in time, users can quickly handle water level abnormality problems to avoid damage to internal components (such as motors, sensors, etc.) of the washing machine caused by water level abnormalities, prolonging the service life of the washing machine. The water level alarm module can adapt to different washing modes and water level requirements, whether it is high water level washing or low water level rinsing, and can realize effective monitoring and alarm, improving the applicability and reliability of the device. By warning water level abnormalities in advance, users can take timely measures to avoid serious failures caused by water level abnormalities, reducing maintenance frequency and cost.

[0045] The embodiment also provides a washing machine, which comprises a washing machine inner drum 200, a washing machine outer drum 100 and the water level detection device described above. The infrared signal emitting end 32 emits an infrared signal to the floating member 2 in the detection cylinder 1, and the infrared signal reflected by the floating member 2 is received by the infrared signal receiving end 33. Under the signal processing of the control circuit board 31, the position of the floating member 2 is detected. Since the water inlet 11 of the detection cylinder 1 is in communication with the washing machine outer drum 100, and the washing machine inner drum 200 is in communication with the washing machine outer drum 100, the water level in the washing machine inner drum 200 can be detected by the position of the floating member 2. The delay problem caused by the indirect measurement of the traditional flow meter is avoided, the real-time detection of the water level is realized, the timeliness of the water level detection is improved, the change of the water level can be accurately captured through the cooperation of the infrared detection module 3 and the floating member 2, the signal emitted by the infrared signal emitting end 32 is reflected by the floating member 2 and then received by the receiving end, the signal transmission is stable, the anti-interference ability is strong, the accuracy of the water level detection is ensured, the density of the floating member 2 is less than that of water, and the floating member 2 can freely float with the change of the water level, so that the sensitivity and reliability of the detection are ensured. Since the water level detection is directly performed, the hysteresis problem caused by the indirect measurement of the traditional flow meter is avoided, the response of the water level signal in the control application is more rapid, and the overall control performance of the washing machine is improved.

[0046] The functions of the infrared detection module 3, the water level alarm module and the like of the water level detection device are combined with the control system of the washing machine, so that the automatic water level monitoring and abnormal alarm can be realized, and the intelligent degree and user experience of the washing machine are significantly improved. The water level detection device can monitor the water level state in real time, prevent overflow caused by too high water level or dry burning caused by too low water level, effectively avoid safety hazards, and improve the use safety of the washing machine. Through accurate water level detection and control, damage to internal components (such as motors, sensors and the like) of the washing machine caused by abnormal water level is avoided, the equipment failure rate is reduced, and the service life of the washing machine is prolonged. The water level detection device can automatically adjust the water inlet, water outlet and washing process according to the actual water level demand, avoid water resource waste, improve washing efficiency and reduce energy consumption. The water level detection device can adapt to the water level demand of different washing modes (such as high water level washing and low water level rinsing), ensure accurate water level detection and control in various washing modes, and improve the applicability and flexibility of the washing machine. The stability and reliability of the water level detection device reduce the washing machine failure caused by abnormal water level, reduce the maintenance frequency and cost, and the modular design facilitates maintenance and replacement.

[0047] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments here, those skilled in the art can be made various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. A water level detection device, characterized in that, include: A detection cylinder (1) is disposed between the inner drum (200) and the outer drum (100) of the washing machine. The detection cylinder (1) is provided with a water inlet (11), which is connected to the outer drum (100) of the washing machine. A floating element (2) is movably disposed inside the detection cylinder (1), and the density of the floating element (2) is less than that of water; The infrared detection module (3) includes a control circuit board (31), an infrared signal transmitter (32) and an infrared signal receiver (33). The infrared signal transmitter (32) is used to transmit infrared signals to the floating component (2), and the infrared signal receiver (33) is used to receive infrared signals reflected by the floating component (2).

2. The water level detection device according to claim 1, characterized in that, The water inlet (11) is located at the bottom of the detection drum (1), and the water inlet (11) is connected to the bottom of the outer drum (100) of the washing machine.

3. The water level detection device according to claim 1, characterized in that, The water inlet (11) is equipped with a filter screen.

4. The water level detection device according to claim 1, characterized in that, An infrared reflector is provided on the top of the floating component (2).

5. The water level detection device according to claim 1, characterized in that, The bottom of the floating component (2) is provided with a counterweight.

6. The water level detection device according to claim 1, characterized in that, The detection cylinder (1) is provided with a limiting protrusion, and the floating component (2) can abut against the limiting protrusion.

7. The water level detection device according to any one of claims 1-6, characterized in that, The control circuit board (31) is snapped onto the washing machine cover (400) by a buckle (4), and the control circuit board (31) is located between the washing machine cover (400) and the detection cylinder (1).

8. The water level detection device according to any one of claims 1-6, characterized in that, The side wall of the detection cylinder (1) is provided with a wire hole (12), through which the wiring of the control circuit board (31) passes.

9. The water level detection device according to any one of claims 1-6, characterized in that, The water level detection device includes a water level alarm module, which is used to issue a water level alarm signal.

10. A washing machine, characterized in that, It includes an inner drum (200) of a washing machine, an outer drum (100) of a washing machine, and a water level detection device as described in any one of claims 1-9.

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