Device for detecting contamination of fluid in a suction line
By installing piezoelectric and infrared sensors inside the suction pipe, dirt particles in the fluid are detected and the cleaning equipment parameters are automatically adjusted, solving the problem of poor user experience caused by users manually selecting modes and achieving intelligent cleaning adaptation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU XIAOSHUN TECH CO LTD
- Filing Date
- 2025-03-20
- Publication Date
- 2026-06-26
Smart Images
Figure CN224416779U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a dirt detection device for fluid drawn into a pipe. Background Technology
[0002] Surface cleaning equipment is suitable for cleaning hard floor surfaces, such as tile, hardwood floors, and soft carpet surfaces.
[0003] When cleaning a surface, the cleaning liquid is first delivered to the cleaning module and then applied to the surface. When the cleaning module moves relative to the surface, the surface is cleaned. The liquid after cleaning is recycled and stored in a wastewater tank.
[0004] In existing surface cleaning equipment, users often need to determine the degree of dirt on the floor and select a cleaning mode corresponding to that level of dirt. For example, when the floor is heavily soiled, a powerful mode can be selected to increase the water supply and suction power of the surface cleaning equipment; conversely, when the floor is lightly soiled, a normal mode can be selected, in which the water supply and suction power of the surface cleaning equipment are both lower.
[0005] However, this manual selection mode often makes surface cleaning equipment seem unintelligent, resulting in a poor user experience. Utility Model Content
[0006] This disclosure provides a dirt detection device for fluid inhalation pipes.
[0007] According to one aspect of this disclosure, a contamination detection device for fluid in a suction pipe is provided, comprising:
[0008] A piezoelectric sensing assembly, mounted on the outer wall of the suction pipe, includes at least one piezoelectric sensor configured to detect vibrations in the suction pipe caused by contaminant particles in the fluid during fluid flow; and
[0009] A control module is configured to communicate with the piezoelectric sensing component to process signals from at least one piezoelectric sensor and obtain the number and size of contaminant particles in the fluid.
[0010] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in a suction pipe includes a piezoelectric sensing component installed in an airflow deflection region of the suction pipe, the airflow deflection region being configured to enhance the impact parameters of contaminant particles on the suction pipe.
[0011] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in an inhalation pipe, wherein the airflow deflection area is located at or near a bend in the inhalation pipe.
[0012] According to another aspect of this disclosure, a contamination detection device for fluid drawn into a pipe is provided, comprising:
[0013] An infrared sensing assembly is mounted on the inhalation duct. The infrared sensing assembly includes a plurality of infrared emitters and a plurality of infrared receivers. The infrared emitters are configured to be disposed on a first side of the outer wall of the inhalation duct, and the infrared receivers are configured to be disposed on a second side of the outer wall opposite to the first side. The infrared emitters and receivers are configured to detect optical changes in the cross-section of the inhalation duct that indicate the accumulation of dirt particles.
[0014] A piezoelectric sensing assembly is installed in the airflow deflection region of the suction duct, the piezoelectric sensing assembly including at least one piezoelectric sensor configured to detect vibrations of the suction duct caused by dirt particles in the fluid during fluid flow within the suction duct;
[0015] A control module configured to communicate with an infrared sensing component and a piezoelectric sensing component to process signals from an infrared receiver and at least one piezoelectric sensor, and to obtain the number and size of contaminant particles in the fluid, as well as the accumulation of contaminant particles in the fluid.
[0016] According to at least one embodiment of the present disclosure, a contamination detection device for fluid within an inhalation conduit includes a plurality of infrared emitters arranged in a vertical line along a first side of the outer wall, the plurality of infrared emitters being configured to provide overlapping light beams in a radial direction covering the inhalation conduit, wherein the vertical line lies in a plane perpendicular to the axis of the inhalation conduit.
[0017] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in a suction pipe includes a plurality of infrared receivers configured to align with a plurality of infrared emitters on a second side of the outer wall, the receivers being configured to detect an interruption of the infrared beam caused by the accumulation of contaminant particles.
[0018] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in a suction pipe includes a piezoelectric sensing component installed in an airflow deflection region of the suction pipe, the airflow deflection region being configured to enhance the impact of contaminant particles on the suction pipe.
[0019] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in an inhalation pipe, wherein the airflow deflection area is located at or near a bend in the inhalation pipe.
[0020] According to at least one embodiment of the present disclosure, a contamination detection device for fluid in a suction pipe is provided, wherein the infrared sensing component and the piezoelectric sensing component are configured to be energized simultaneously.
[0021] According to at least one embodiment of the present disclosure, a contamination detection device for fluid within an inhalation conduit is provided, wherein the inhalation conduit is configured to be detachably connected to a cleaning head of a surface cleaning device, and the infrared sensing component and the piezoelectric sensing component are electrically connected to the control module via a detachable connector configured to maintain signal continuity during disassembly and reconnection. Attached Figure Description
[0022] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.
[0023] Figure 1 This is a schematic diagram of the structure of a surface cleaning device according to one embodiment of the present disclosure.
[0024] Figure 2 This is a schematic diagram of a dirt detection device according to one embodiment of the present disclosure.
[0025] Figure 3 This is a schematic diagram showing the arrangement of an infrared sensor assembly according to one embodiment of the present disclosure.
[0026] Figure 4 This is a structural block diagram of a dirt detection device according to one embodiment of the present disclosure.
[0027] The specific labels in the attached figures are as follows:
[0028] 100 handle part
[0029] 200 Main body
[0030] 300 Cleaning Fluid Tank
[0031] 400 sewage tank
[0032] 500 Connecting Part
[0033] 600 Cleaning Head
[0034] 610 roller brush
[0035] 620 Suction Tube
[0036] 700 piezoelectric sensing components
[0037] 800 control module
[0038] 900 Infrared Sensing Component
[0039] 910 Infrared Emitter
[0040] 920 Infrared Receiver. Detailed Implementation
[0041] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.
[0042] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.
[0043] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.
[0044] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.
[0045] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.
[0046] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” another component or feature would subsequently be positioned “above” said other component or feature. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.
[0047] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values that would be recognized by one of ordinary skill in the art.
[0048] Figure 1 This is a schematic diagram of the structure of a surface cleaning device according to one embodiment of the present disclosure.
[0049] like Figure 1 As shown, the surface cleaning device of this disclosure is configured to perform wet cleaning of a surface to be cleaned, wherein the surface to be cleaned can be a floor surface, preferably a household floor surface. Simultaneously, after the surface cleaning device performs wet cleaning of the floor surface, the dirt and liquid (wastewater) remaining after cleaning the surface can be recovered back to the surface cleaning device via a suction pipe. At this time, the fluid flowing in the suction pipe is a mixture of gas, liquid (water), and solid (dirt particles).
[0050] Those skilled in the art should know that the surface cleaning device disclosed herein can also be a vacuum cleaner, in which case the fluid flowing in the suction pipe is a mixture of gas and dirt particles, that is, there is no liquid flowing in the suction pipe of the vacuum cleaner.
[0051] by Figure 1 Taking the wet surface cleaning device shown as an example, the surface cleaning device of this disclosure may include an upright body. Specifically, the upright body of this disclosure may include a handle portion 100 and a main body portion 200. The handle portion 100 is detachably disposed on the main body portion 200. The user can operate the surface cleaning device by operating the handle portion 100, so that the upright body can work in a manner that is substantially parallel to the surface to be cleaned during the operation of the surface cleaning device.
[0052] The handle 100 may be equipped with a user interaction button, which allows the user to control the surface cleaning equipment by triggering the button, such as controlling the start and stop of the surface cleaning equipment, as well as controlling the liquid supply speed and suction power of the suction source.
[0053] The main body 200 is pivotally connected to the cleaning head 600 via the connecting part 500; thus, when the user operates the handle part 100, the cleaning head 600 can be moved on the surface to be cleaned, and the surface to be cleaned can be cleaned by the cleaning head 600.
[0054] In one example, the connector 500 may include a universal joint to allow the body 200 to rotate relative to the cleaning head 600 in two directions. In another example, the connector 500 may include a multi-axis joint that couples the body 200 to the cleaning head 600 to allow the body 200 to rotate relative to the cleaning head 600 in a first direction and a second direction.
[0055] The main body 200 can be pivoted to an upright position (also known as a storage position) via the connecting part 500. In this position, the angle between the main body 200 and the surface of the cleaning head 600 (or the ground) is 80° to 90°, preferably around 80°. In this position, the surface cleaning device is in a self-supporting posture (also known as an upright posture), meaning that the main body 200 can be supported by the cleaning head 600, and an upright posture can be achieved without the aid of other objects.
[0056] The main body 200 can also accommodate components such as a cleaning fluid tank 300 and a wastewater tank 400. In this disclosure, the cleaning fluid tank 300 is detachably mounted to the side of the main body 200, and the mounting position can be located on the front side of the main body 200. The wastewater tank 400 is detachably mounted to the side of the main body 200, and the mounting position can be located on the rear side of the main body. In another embodiment, the cleaning fluid tank 300 of this disclosure can also be provided on the cleaning head 600.
[0057] In one example, the thickness of the wastewater tank 400 is set to be less than its width, and the height of the cleaning liquid tank 300 is set to be less than its width. This ensures sufficient capacity and allows the overall height of the surface cleaning equipment to be less than a predetermined height, such as 120mm, after the main body 200 is laid flat.
[0058] The cleaning solution tank 300 is used to store water to be treated. The water in the cleaning solution tank 300 can be supplied to the cleaning head 600 of the surface cleaning device, or to the surface to be cleaned near the cleaning head 600, thereby enabling wet cleaning of the surface to be cleaned using the water in the cleaning solution tank 300.
[0059] The main body 200 has a receiving space, and the sewage tank 400 is detachably installed in the main body 200 and located in the receiving space, so that when the sewage tank 400 contains a lot of liquid, the user can remove the sewage tank 400, pour out the sewage inside and clean up the solid waste. At this time, part of the outer surface of the sewage tank 400 forms part of the outer surface of the surface cleaning device.
[0060] The cleaning head 600 disclosed herein may include a roller brush 610 and a suction nozzle; wherein the suction nozzle is located behind the roller brush 610, thereby allowing used water and dirt to enter the suction pipe through the suction nozzle and flow further to the wastewater tank 400.
[0061] Figure 2 This is a schematic diagram of a dirt detection device according to one embodiment of the present disclosure.
[0062] like Figure 2 As shown, the suction conduit 620 of this disclosure is configured to be detachably connected to the cleaning head of a surface cleaning device, and the infrared sensing component 900 and the piezoelectric sensing component 700 are electrically connected to the control module 800 via a detachable connector configured to maintain signal continuity during disassembly and reconnection.
[0063] Specifically, the contamination detection device for fluid in the suction pipe disclosed herein may include components such as a piezoelectric sensing component 700 and a control module 800; wherein, the piezoelectric sensing component 700 is installed on the outer wall of the suction pipe 620, and the piezoelectric sensing component 700 includes at least one piezoelectric sensor, which is configured to detect the vibration of the suction pipe 620 caused by contaminant particles in the fluid when the fluid flows within the suction pipe 620; the control module 800 is configured to communicate with the piezoelectric sensing component 700 to process signals from at least one piezoelectric sensor and obtain the number and size of contaminant particles in the fluid.
[0064] Specifically, when the fluid flows in the suction pipe 620, the dirt particles in the fluid will collide with the side wall of the suction pipe 620. Therefore, the number and size of the dirt particles in the fluid can be obtained by detecting the vibration signal generated by the collision, thereby enabling the determination of the degree of dirtiness of the fluid.
[0065] Furthermore, once the degree of contamination of the fluid is obtained, the operating parameters of the surface cleaning equipment can be adjusted accordingly. Specifically, when the fluid is more contaminated, the suction power of the surface cleaning equipment and the supply of cleaning liquid can be increased. Conversely, when the fluid is less contaminated, the suction power of the surface cleaning equipment and the supply of cleaning liquid can be reduced, thereby achieving active control of the surface cleaning equipment and improving the user experience.
[0066] In a preferred embodiment, the piezoelectric sensing component 700 is installed in the airflow deflection region of the intake duct 620, which is configured to enhance the impact parameters of dirt particles on the intake duct 620. Specifically, the impact parameters may include impact frequency and impact force. Correspondingly, the vibration signal received by the piezoelectric sensor may include vibration frequency and vibration amplitude. Under the premise of constant fluid flow, a higher vibration frequency can be considered as a greater number of dirt particles in the fluid, or a higher concentration of dirt particles. A higher vibration amplitude can be considered as a larger size of dirt particles in the fluid.
[0067] In this disclosure, such as Figure 2 As shown, the airflow turning area is located at or near the bend of the intake duct 620, and the piezoelectric sensing component 700 is disposed at the bend accordingly.
[0068] In another implementation, the contamination detection device for fluid within the suction pipe of this disclosure further includes an infrared sensing component 900, which is mounted on the suction pipe 620. The infrared sensing component 900 includes multiple infrared emitters and multiple infrared receivers. The infrared emitters are configured to be disposed on a first side of the outer wall of the suction pipe 620, and the infrared receivers are configured to be disposed on a second side of the outer wall opposite to the first side. The infrared emitters and receivers are configured to detect optical changes in the cross-section of the suction pipe 620 that indicate the accumulation of contaminant particles. In this case, the control module 800 is also configured to communicate with the infrared sensing component 900 to process signals from the infrared receivers and obtain the accumulation of contaminant particles in the fluid.
[0069] Positionally, multiple infrared emitters are arranged in a vertical line along a first side of the outer wall, thereby enabling the multiple infrared emitters to provide overlapping beams in the radial direction covering the suction duct 620, wherein the vertical line lies in a plane perpendicular to the axis of the suction duct 620, in which case the infrared emitters are capable of detecting dirty particles in the fluid throughout the suction duct 620.
[0070] Multiple infrared receivers are configured to align with multiple infrared emitters on the second side of the outer wall. The receivers are configured to detect interruptions (attenuation) in the infrared beam caused by the accumulation of dirt particles, and to determine the accumulation of dirt particles based on the frequency of these interruptions. Specifically, greater signal attenuation indicates more light blockage, and correspondingly, a higher concentration of dirt particles.
[0071] In a preferred embodiment, the infrared sensing component 900 and the piezoelectric sensing component 700 are configured to be energized simultaneously, thereby enabling the control module 800 to integrate the signals from the infrared sensing component 900 and the piezoelectric sensing component 700 to enhance detection accuracy.
[0072] In addition, the control module 800 is further configured to generate a vacuum power adjustment signal (i.e., a suction adjustment signal) when the detected optical changes or vibrations exceed a predefined threshold. The surface cleaning device can adjust the suction of the surface cleaning device according to the suction adjustment signal to ensure efficient cleaning operations.
[0073] In this disclosure, the control module 800 is configured to periodically calibrate the infrared sensing component 900 and the piezoelectric sensing component 700 to establish a reference signal for the cleanliness of the suction duct.
[0074] This disclosure discloses a contamination detection device for fluid entering a suction pipe, used to sense the presence of contaminant particles passing through the suction pipe. For example... Figure 2 The suction pipe shown has a suction section with an inlet channel inside. An outlet section, offset from the suction section, has an outlet channel. A connecting assembly or bend connects the adjacent ends of the suction and outlet sections. The suction section, outlet section, and connecting assembly can be assembled separately into a single unit, or they can be made from a single pipe with an offset portion.
[0075] Furthermore, the connecting assembly has an expansion cavity connecting the inlet channel and the outlet channel. The cross-sectional area of the expansion cavity is larger than the cross-sectional area of the inlet channel and the outlet channel to form a bend in the suction pipe, which also forms a fluid bending region.
[0076] The piezoelectric sensor disclosed herein can be fixed by a mounting component. The mounting component can be made of an elastic material. Thus, the piezoelectric sensor can sense and amplify the signal generated by dirt particles impacting the sidewall of the suction pipe.
[0077] In operation, the airflow and the dirt particles it carries are drawn in through the inlet channel and flow towards the piezoelectric sensor. The airflow changes direction in the expansion chamber and moves towards the outlet channel. Due to the momentum of the dirt particles, they continue to move forward and impact the inner wall of the expansion chamber. The piezoelectric sensor continuously monitors the dirt particles in the intake pipe and obtains parameters such as the dirt particle content.
[0078] The piezoelectric sensor disclosed herein has an impact surface, which is the first device for dirt particles to impact and generate vibration signals. Preferably, the impact surface is a metal component, such as stainless steel. A dirt particle impact sensor is mounted on the upper side of the impact surface. The sensor is a piezoelectric ceramic with electrode films on both sides. A conductive adhesive material, such as an adhesive, fixes the films to the top of the impact surface. The ceramic is the second device for picking up the vibration signal and converting it into an electrical signal. Since piezoelectric sensors are common components in the industry, their specific structure will not be described in detail.
[0079] An infrared sensing assembly, comprising multiple infrared emitters and multiple infrared receivers, is installed on the side wall of the suction duct. The lower part of the infrared sensing assembly has a support frame fixed to the connection structure. The frame is connected to the outer wall of the duct via elastic pads to reduce vibration interference.
[0080] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.
[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0082] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.
Claims
1. A device for detecting contamination in fluid drawn into a pipe, characterized in that, include: A piezoelectric sensing assembly is mounted on the outer wall of the suction pipe, the piezoelectric sensing assembly including at least one piezoelectric sensor configured to detect vibrations of the suction pipe caused by dirt particles in the fluid during fluid flow within the suction pipe; as well as A control module configured to communicate with the piezoelectric sensing component to process signals from at least one piezoelectric sensor and obtain the number and size of contaminant particles in the fluid; The suction pipe has a suction section and an outlet section, and the suction section has an inlet channel inside; the outlet section is offset from the suction section and has an outlet channel; a connecting assembly connects the adjacent ends of the suction section and the outlet section; the connecting assembly has an expansion cavity connecting the inlet channel and the outlet channel, and the cross-sectional area of the expansion cavity is larger than the cross-sectional area of the inlet channel and the outlet channel, so as to form a bend in the suction pipe through the expansion cavity, and to form a fluid bending region at the bend in the suction pipe; The piezoelectric sensing component is installed in the airflow deflection region of the suction duct, the airflow deflection region is configured to enhance the impact parameters of dirt particles on the suction duct, and the airflow deflection region is located at or near the bend of the suction duct.
2. A device for detecting contamination in fluid drawn into a pipe, characterized in that, include: An infrared sensing assembly is mounted on the inhalation duct. The infrared sensing assembly includes a plurality of infrared emitters and a plurality of infrared receivers. The infrared emitters are configured to be disposed on a first side of the outer wall of the inhalation duct, and the infrared receivers are configured to be disposed on a second side of the outer wall opposite to the first side. The infrared emitters and receivers are configured to detect optical changes in the cross-section of the inhalation duct that indicate the accumulation of dirt particles. A piezoelectric sensing assembly is installed in the airflow deflection region of the suction duct, the piezoelectric sensing assembly including at least one piezoelectric sensor configured to detect vibrations of the suction duct caused by dirt particles in the fluid during fluid flow within the suction duct; A control module configured to communicate with an infrared sensing component and a piezoelectric sensing component to process signals from multiple infrared receivers and at least one piezoelectric sensor, and to obtain the number and size of contaminant particles in the fluid, as well as the accumulation of contaminant particles in the fluid. The suction pipe has a suction section and an outlet section, and the suction section has an inlet channel inside; the outlet section is offset from the suction section and has an outlet channel; a connecting assembly connects the adjacent ends of the suction section and the outlet section; the connecting assembly has an expansion cavity connecting the inlet channel and the outlet channel, and the cross-sectional area of the expansion cavity is larger than the cross-sectional area of the inlet channel and the outlet channel, so as to form a bend in the suction pipe through the expansion cavity, and to form a fluid bending region at the bend in the suction pipe; The piezoelectric sensing component is installed in the airflow deflection region of the suction duct, the airflow deflection region is configured to enhance the impact parameters of dirt particles on the suction duct, and the airflow deflection region is located at or near the bend of the suction duct.
3. The contamination detection device for fluid in a suction pipe according to claim 2, characterized in that, The plurality of infrared emitters are configured to be arranged in a vertical line along a first side of the outer wall, and the plurality of infrared emitters are configured to provide overlapping light beams in a radial direction covering the inhalation conduit, wherein the vertical line lies in a plane perpendicular to the axis of the inhalation conduit.
4. The contamination detection device for fluid in a suction pipe according to claim 3, characterized in that, The plurality of infrared receivers are configured to align with the plurality of infrared emitters on the second side of the outer wall, and the receivers are configured to detect interruptions in the infrared beam caused by the accumulation of dirt particles.
5. The contamination detection device for fluid in a suction pipe according to claim 2, characterized in that, The infrared sensing component and the piezoelectric sensing component are configured to be energized simultaneously.
6. The contamination detection device for fluid in a suction pipe according to claim 2, characterized in that, The suction conduit is configured to be detachably connected to the cleaning head of the surface cleaning device, and the infrared sensing component and the piezoelectric sensing component are electrically connected to the control module via a detachable connector configured to maintain signal continuity during disassembly and reconnection.