Liquid deficiency detection device and wet cleaning apparatus

Abstract

The utility model discloses a kind of liquid deficiency detection device and wet type cleaning equipment, and liquid deficiency detection device includes fluid passage for liquid flow. Liquid deficiency detection device further includes heating element, heat conducting piece, temperature sensor and controller. Heating element is set to the periphery of fluid passage or the inside of fluid passage, for generating heat. Heat conducting piece, for conducting at least part of heat generated by heating element to fluid, to make the flow of liquid in fluid passage take away at least part of heat located in heat conducting piece. Temperature sensor is used to detect the temperature of surroundings, and temperature sensor is set to the periphery of heating element or heat conducting piece, or temperature sensor is set immediately adjacent to heating element or heat conducting piece. Controller judges whether there is liquid flow in fluid passage according to the signal transmitted by temperature sensor. Using the above-mentioned liquid deficiency detection device, different water quality can be effectively adapted, and the detection accuracy is improved. Moreover, simple structure, more low cost.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, and in particular to a liquid shortage detection device and a wet cleaning device. Background Technology

[0002] Wet cleaning equipment typically includes a cleaning solution supply system, which usually includes a supply pipeline. To provide immediate feedback on whether there is liquid flow in the supply pipeline, a low liquid detection device is generally installed in the supply pipeline.

[0003] Currently, commonly used methods include capacitive water shortage detection, ultrasonic detection, and photoelectric infrared detection. Capacitive water shortage detection detects water level based on the difference in capacitance between liquid and air; however, its sensitivity is prone to decay, its stability is poor over long-term use, and its accuracy is affected by humidity. Ultrasonic detection uses the principle of ultrasonic wave reflection to detect the presence of water in pipes; this method is complex, costly, and inconvenient to use. Photoelectric infrared detection uses infrared emitting and receiving components, utilizing the difference in refractive index of light in water and air to determine whether there is a water shortage in the pipe. This method carries the risk of false alarms for turbid liquids, and dirt on the sensor surface can also cause false alarms. Utility Model Content

[0004] To address the shortcomings of the aforementioned technologies, this invention provides a liquid shortage detection device and a wet cleaning equipment, which can improve the accuracy of the liquid shortage detection device.

[0005] On the one hand, this utility model provides a liquid shortage detection device, including Fluid channels for the flow of liquid; A heating element is disposed around or inside the fluid channel to generate heat; A heat-conducting element is used to conduct at least a portion of the heat generated by the heating element to a fluid, so that the flow of liquid in the fluid channel carries away at least a portion of the heat located in the heat-conducting element; A temperature sensor is used to detect the ambient temperature. The temperature sensor is disposed around the heating element or the heat-conducting component, or the temperature sensor is disposed adjacent to the heating element or the heat-conducting component. The controller determines whether there is liquid flow in the fluid channel based on the signal transmitted by the temperature sensor.

[0006] Optionally, a conduit is included, the conduit defining the fluid passage, and the heat-conducting element is part of the conduit.

[0007] Optionally, the device includes a housing defining a first cavity and a second cavity, the thermally conductive element separating the first cavity and the second cavity, the second cavity being part of the fluid channel.

[0008] Optionally, both the heating element and the temperature sensor are disposed within the first cavity, and a heat-conducting medium is disposed within the first cavity.

[0009] Optionally, it also includes a circuit board, at least a portion of which is disposed within the first cavity, with the heating element and the temperature sensor disposed on the side of the circuit board facing the heat-conducting element.

[0010] Optionally, it also includes a positive electrode and a negative electrode, both of which are disposed in the second cavity.

[0011] This utility model provides a liquid shortage detection device, disposed in a pipeline, the pipeline defining a fluid channel for liquid flow; characterized in that the liquid shortage detection device comprises: A heating element is disposed on the outer periphery of the pipe to generate heat; A heat-conducting element is used to conduct at least a portion of the heat generated by the heating element to the pipeline, so that the flow of liquid in the fluid channel carries away at least a portion of the heat located in the heat-conducting element; A temperature sensor for detecting the temperature around it, the temperature sensor being disposed around the heating element or the heat-conducting element, or the temperature sensor being disposed adjacent to the heating element or the heat-conducting element; The controller determines whether there is liquid flow in the fluid channel based on the signal transmitted by the temperature sensor.

[0012] Optionally, the heat-conducting element is configured to at least surround a portion of the piping.

[0013] Optionally, the liquid shortage detection device can be detachably installed in the pipeline.

[0014] On the other hand, the present invention also provides a wet cleaning device, including a cleaning fluid supply system, the cleaning fluid supply system including a cleaning fluid tank and a supply pipeline, the supply pipeline including the aforementioned low fluid detection device.

[0015] This invention provides a liquid shortage detection device and a wet cleaning device. The liquid shortage detection device includes a fluid channel for liquid flow. It also includes a heating element, a heat-conducting component, a temperature sensor, and a controller. The heating element is disposed around or inside the fluid channel to generate heat. The heat-conducting component conducts at least a portion of the heat generated by the heating element to the fluid, allowing the flow of liquid within the fluid channel to carry away at least a portion of the heat located on the heat-conducting component. The temperature sensor detects the ambient temperature and is disposed around or adjacent to the heating element or heat-conducting component. The controller determines whether there is liquid flow in the fluid channel based on the signal transmitted by the temperature sensor. Using this liquid shortage detection device, it can effectively adapt to different water qualities and improve detection accuracy. Furthermore, it has a simple structure and lower cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a sweeping robot according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an upright vacuum cleaner in one embodiment; Figure 3 This is a schematic diagram of the structure of a liquid shortage detection device in one embodiment; Figure 4 For along Figure 3 Cross-sectional view along the AA direction; Figure 5 For along Figure 3 Cross-sectional view in the middle BB direction; Figure 6 for Figure 3 An exploded view of the liquid shortage detection device shown. Figure 7 This is an exploded view of the liquid shortage detection device from another angle; Figure 8 This is a schematic diagram of a liquid shortage detection device in one embodiment (the heat-conducting component is part of a pipe). Figure 9 This is a schematic diagram of a liquid shortage detection device in one embodiment (the heat-conducting component is located inside the fluid channel). Figure 10 This is a schematic diagram of a liquid shortage detection device in operation (the liquid shortage detection device is a clamp type and can be clamped to the outer surface of the pipe). Figure 11 This is a schematic diagram of the liquid shortage detection device from another angle (the liquid shortage detection device is a clamp type and can be clamped to the outer surface of the pipe). Figure 12 This is a schematic diagram of the liquid shortage detection device from another angle (the liquid shortage detection device is a clamp type and can be clamped to the outer surface of the pipe). Figure 13This is a circuit diagram of an MCU in one embodiment; Figure 14 This is a circuit control diagram in one embodiment; Figure 15 This is a control logic diagram in one embodiment. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] In the description of this application, it should be noted that, unless otherwise expressly 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 connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] refer to Figure 1 and 2 The figure discloses a wet cleaning device 100, which can be a horizontal cleaning device or a vertical cleaning device. Figure 2 (as shown), handheld cleaning devices or autonomous cleaning devices ( Figure 1 One of the following (shown). The wet cleaning equipment 100 generally includes a dirt recovery system and a cleaning fluid supply system. The working principle of the wet cleaning equipment 100 is well known to those skilled in the art and will not be described in detail here. The following details the low-liquid detection device 1 in this application. The cleaning fluid supply system includes a cleaning fluid tank and a supply pipeline 19 (see reference). Figure 8 (Or 9). The low fluid detection device 1 is generally part of or installed on the supply line 19. The low fluid detection device 1 is used to detect whether there is cleaning fluid flowing in the supply line 19.

[0022] refer to Figure 1-9 The figure discloses a liquid shortage detection device 1, which includes a fluid channel 11 for liquid flow. The area surrounding the fluid channel 11 (see reference) Figure 8 ) or inside the fluid channel 11 (refer to Figure 9A heating element 12 is provided. The heating element 12 is used to generate heat. A heat-conducting element 13 is provided around the heating element 12. The heat-conducting element 13 can be in direct contact with the heating element 12, or it can be indirect contact with the heating element 12 through a heat-conducting material. The heating element 12 can be a 12V DC PTC heater with a power of 8W. The heating element 12 can also be a power resistor, a metal heating wire, or other heat-generating element. There are no restrictions here. The heat-conducting element 13 can be formed together with the heating element 12, or it can be set separately. The heat-conducting element 13 can be a stainless steel sheet or an alumina ceramic sheet, or it can be made of other materials with good thermal conductivity. There are no restrictions here. The heating element 12 itself can also have some structures with thermal conductivity to cooperate with the heat-conducting element 13. The heat-conducting element 13 is used to conduct at least part of the heat generated by the heating element 12 to the fluid, so that the flow of the liquid in the fluid channel 11 carries away at least part of the heat located in the heat-conducting element 13. The liquid shortage detection device 1 also includes a temperature sensor 14 and a controller (not shown in the figure). The temperature sensor 14 is used to detect the ambient temperature. The temperature sensor 14 is disposed around the heating element 12 or the heat-conducting element 13, or adjacent to the heating element 12 or the heat-conducting element 13. The NTC temperature sensor 14 can be an MF52 type NTC thermistor with a resistance of 10kΩ (at 25°C). In other embodiments, the temperature sensor 14 can also be a thermocouple, a resistance temperature detector (RTD), an integrated temperature sensor, or other sensors capable of acquiring temperature data; no limitation is made here. The controller determines whether there is liquid flow in the fluid channel 11 based on the signal transmitted by the temperature sensor 14. The controller can use an HC89F3216 microcontroller as its core, controlling the heating unit to turn on and off through a MOSFET, and acquiring the NTC voltage divider value in real time through an ADC, converting it into temperature for temperature detection. The control module can also be other types of MCUs; no limitation is made here.

[0023] Continue to refer to Figure 3-9When fluid is present in fluid channel 11, the flow of liquid carries away some heat. At this time, the temperature detected by temperature sensor 14 is lower than a preset threshold. The preset threshold can be any temperature that can achieve the desired result, adjusted by the R&D personnel according to the actual situation. The preset threshold can be a single value (e.g., 75°C). If it is lower than this value, it indicates that there is fluid flowing in fluid channel 11, which does not affect operation. If it is higher than this value, it indicates that there is insufficient or no liquid in fluid channel 11, which may affect normal operation. The preset threshold can also be a range (e.g., 50°-75°, this is just an example and not a limitation). When the temperature is lower than the lowest temperature in the threshold (50°), it indicates that there is fluid flowing in fluid channel 11. When the temperature is higher than the highest temperature in the threshold (75°), it indicates that there is insufficient or no liquid in fluid channel 11. Using a range-based preset threshold, the temperature between 50° and 75° is a transition range. The existence of this transition range can effectively avoid false alarms. At the same time, the transition range can be adjusted according to the actual situation to adjust the alarm response time.

[0024] The controller determines that there is liquid flow based on the signal fed back by the temperature sensor 14 and will not issue a low liquid alarm. When there is no liquid flow or only a small amount of liquid flow in the fluid channel 11, the heat generated by the heating element 12 will accumulate in the vicinity. Since the heat cannot be dissipated in time, the temperature at that location will rise rapidly. Once the temperature detected by the temperature sensor 14 exceeds the preset threshold, the controller determines that there is no liquid flow or no large amount of liquid flow in the fluid channel 11 based on the signal fed back by the temperature sensor 14, and will issue an alarm signal to remind the user to add cleaning fluid or take other measures.

[0025] Using the above-mentioned liquid shortage detection device can bring the following beneficial effects: 1. Improved detection accuracy: It relies on temperature changes to determine whether there is a water shortage in the fluid pipeline 16, and is not affected by water quality (it is applicable to pure water, hard water, or turbid water). 2. Control the response speed: When water is scarce, the temperature rises rapidly, and the judgment can be completed in about 5 seconds; at the same time, the response speed can be adjusted according to the situation based on the preset threshold range. 3. Low cost: The structure is simple, the heating element 12 and the NTC temperature sensor 14 are inexpensive, and it is easy to mass-produce; 4. Safety: The entire module can be sealed with glue, providing good waterproofing.

[0026] refer to Figure 13-15This section introduces the circuit control principle in one implementation method. The chip (U1) can be an 8051 core microcontroller, and the capacitor (C1) is 10μF / 25V, used for power filtering / regulation. The power supply uses the cleaning equipment's power supply, which is used to reduce the equipment voltage to 12V via a DC-DC converter (DCDC), and then further reduced to 5V via a linear regulator (LDO). The 12V supplies power to the heating element 12, and the 5V supplies power to the microcontroller (MCU). The MCU's I / O ports directly control the switching on and off of the MOSFET Q9. When the Heat CTRL outputs a high level, Q9 is turned on, and the heating element 12 starts working; when the Heat CTRL outputs a low level, Q9 is turned off, and the heating element 12 stops working.

[0027] When the resistance of the NTC circuit changes with temperature, it decreases as the temperature rises, reducing the voltage drop between the NTC circuit and R27. The microcontroller then uses an ADC to acquire the voltage and thus the temperature value. R28 and C11 form an RC filter capacitor to remove high-frequency noise interference from the input signal. After the microcontroller activates the heating element 12, it simultaneously acquires the temperature via the ADC and determines whether there is a water shortage based on the temperature change. If a water shortage is detected, the microcontroller controls the heating element 12 to shut down. At the same time, the microcontroller can transmit a signal to the main control unit of the cleaning equipment, which can then issue an alarm signal and simultaneously stop the boiler and other heaters in the cleaning equipment from operating. Based on the above working principle, the structure of the liquid shortage detection device 1 in different embodiments is described below: Example

[0028] refer to Figure 8 In this embodiment, the liquid shortage detection device 1 includes a pipe 16. The pipe 16 defines a fluid channel 11, and the heat-conducting element 13 is part of the pipe 16. The pipe 16 includes an inlet 191 and an outlet 192. The pipe 16 can be part of the entire supply pipe 19, or it can be a separate pipe 16. For example, both ends of the pipe 16 are provided with mounting structures, which can be installed on the supply pipe 19. The heating element 12 and the temperature sensor 14 are disposed outside the heat-conducting element 13, that is, on the outer periphery of the pipe 16. The heating element 12 is in direct or indirect contact with the heat-conducting element 13, and the temperature sensor 14 can be in direct or indirect contact with the heat-conducting element 13. Example

[0029] refer to Figure 3-7In this embodiment, the liquid shortage detection device 1 is a separate component. The liquid shortage detection device 1 includes a housing 17, which includes a first housing 171 and a second housing 172. The housing 17 defines a first cavity 173 and a second cavity 174. A heat-conducting element 13 separates the first cavity 173 and the second cavity 174. The first cavity 173 is used to mount electronic components, and the second cavity 174 is part of the fluid channel 11. The heating element 12 and the temperature sensor 14 are both disposed within the first cavity 173, which contains a heat-conducting medium. The heat-conducting medium can be a material that simultaneously possesses thermal conductivity and sealing properties, such as thermally conductive silicon. Alternatively, a material without sealing function can be used as the heat-conducting medium, and the sealing structure can employ other materials or a mechanical sealing structure. The housing 17 includes an inlet 191 and an outlet 192. After the liquid flows into the second cavity 174 from the inlet 191, it comes into contact with the heat-conducting element 13, carries away some of the heat on the heat-conducting element 13, and then flows out from the outlet 192.

[0030] Continue to refer to Figure 3-7 The liquid shortage detection device 1 also includes a circuit board 18, at least a portion of which is disposed within the first cavity 173. The heating element 12 and the temperature sensor 14 are disposed on the side of the circuit board 18 facing the heat-conducting element 13. Thermally conductive silicone can be filled into the first cavity 173. The thermally conductive silicone serves both as a heat conductor and a sealant, making the liquid shortage detection device 1 safer to use.

[0031] Continue to refer to Figure 3-7 The liquid shortage detection device 1 also includes a positive electrode 181 and a negative electrode 182, both of which are disposed in the second cavity 174. When the positive electrode 181 and the negative electrode 182 are energized, they can electrolyze the cleaning solution to produce electrolyzed water, thereby giving the cleaning solution a certain bactericidal or disinfecting effect.

[0032] refer to Figure 10-12This application also discloses a liquid shortage detection device 1, whose working principle is the same as that in the above embodiments. The difference is that the liquid shortage detection device 1 is a separate device. The liquid shortage detection device 1 is detachably installed in the pipeline 20. The pipeline 20 defines a fluid channel 11 for liquid flow. The liquid shortage detection device 1 includes a heating element 12, a heat-conducting element 13, a temperature sensor 14, and a controller. The heating element 12 is disposed on the outer periphery of the pipeline 20 and is used to generate heat. The heat-conducting element 13 is used to conduct at least a portion of the heat generated by the heating element 12 to the pipeline 20, so that the flow of liquid in the fluid channel 11 carries away at least a portion of the heat located on the heat-conducting element 13. The temperature sensor 14 is used to detect the temperature around it. The temperature sensor 14 is disposed around the heating element 12 or the heat-conducting element 13, or adjacent to the heating element 12 or the heat-conducting element 13. The controller determines whether there is liquid flow in the fluid channel 11 based on the signal transmitted by the temperature sensor 14.

[0033] refer to Figure 10 and 11 In one embodiment, the heating element 12 is a PTC heating element, and the temperature sensor 14 is an NTC temperature sensor 14. A thermally conductive layer 13, such as a stainless steel sheet or an alumina ceramic sheet, is placed between the heating element 12 and the pipe 20. The thermally conductive layer 13 is configured to at least partially surround the pipe 20. This ensures efficient heat transfer to the interior of the pipe 20. The NTC temperature sensor 14 is fixed to the wall of the pipe 20 body, with its sensing end in close contact with the inner wall and coated with thermally conductive silicone. The distance between the NTC and the heating element 12 is 5-20mm to avoid interference from the heat radiation generated by the heating element 12 with the NTC temperature measurement. Specifically, the pipe 20 can be made of PPR material, with a diameter of 15mm and a length of 80mm. The inlet and outlet are connected to the water purifier pipe 20 via quick-connect fittings. The heating element 12 is a 12V DC PTC heater with a power of 8W, which is attached and fixed to the outer surface of the pipe 20 body, and the attachment point is coated with thermal grease. In other embodiments, the heating element 12 can also be a power resistor, a metal heating wire, or other heat-generating element, which is not limited here. The NTC temperature sensor 14 is an MF52 type NTC thermistor with a resistance of 10kΩ (at 25℃), which is fixed to the inner wall of the pipe 20 body through a silicone sealing seat. The distance between the temperature sensor 14 and the PTC heater is 8mm. In other embodiments, the temperature sensor 14 can also be a thermocouple, a resistance temperature detector (RTD), an integrated temperature sensor, or other temperature-sensing sensor, which is not limited here. The controller uses an HC89F3216 microcontroller as its core, which controls the opening and closing of the heating unit through a MOSFET and collects the NTC voltage divider value in real time through an ADC, converting it into temperature to achieve temperature detection. The control module can also be other types of MCUs, which is not limited here.

[0034] When liquid (water) flows in fluid channel 11, the heat generated by the PTC is carried away by the water flow, and the temperature inside the device will not continue to rise. The temperature will stabilize within a certain range. If the real-time temperature collected by the NTC is less than the preset temperature threshold, it is determined that there is water. The temperature threshold 1 is set to 50℃, which can be adjusted according to the actual working conditions.

[0035] When there is a lack of liquid in the fluid channel 11: heat accumulates, causing the temperature to rise rapidly. Since the heat is not carried away by the water flow, the temperature will also rise significantly. When the real-time temperature exceeds the preset threshold 2, it is determined to be a water shortage state. The temperature threshold 2 is set to 75℃, which can be adjusted according to the actual working conditions. After water shortage, the heating element 12 is turned off, and heating is turned on again after adding clean water, and the water shortage is rechecked.

[0036] The liquid shortage detection device 1 in this application can be used not only in the cleaning field, but also in any other field that requires the detection of water shortage in fluids.

[0037] This application also discloses a method for detecting fluid deficiency, the method comprising: The heat-conducting component 13, which is in contact with the liquid in the fluid channel 11, is heated; The temperature of the heat-conducting component 13 itself or the temperature surrounding the heat-conducting component 13 is obtained; The temperature is used to determine whether there is liquid flow in the fluid channel 11.

[0038] The heat-conducting component 13 is in direct or indirect contact with the liquid in the fluid channel 11. The heat-conducting component 13 can be in direct contact with the liquid, or it can be indirect contact with the liquid through a heat-conducting medium, as long as it can carry away some of the heat from the heat-conducting component 13 when the liquid flows through the fluid channel 11. The heat-conducting medium can be thermally conductive silicone or other materials with thermal conductivity, and these heat-conducting media preferably also provide a sealing effect.

[0039] Heating the heat-conducting element 13, which is in contact with the liquid in the fluid channel 11, includes: The heat-conducting element 13 is heated by a heating element 12 disposed around or inside the fluid channel 11. (See reference) Figure 8 Alternatively, 10, the heat-conducting element 13 is disposed around the fluid channel 11; Reference Figure 9 The heat-conducting component 13 is disposed inside the fluid channel 11.

[0040] Obtaining the temperature of the heat conductor 13 itself or the area surrounding the heat conductor 13 includes: The ambient temperature is detected by a temperature sensor 14 positioned around the heating element 12 or the heat-conducting component 13. (Reference) Figure 4Alternatively, the temperature sensor 14 may be disposed around the heating element 12. This can include the temperature sensor 14 being adjacent to the heating element 12 or the heat-conducting element 13, or a heat-conducting medium (e.g., thermally conductive silicone) may be disposed between the temperature sensor 14 and the heating element 12, or between the temperature sensor 14 and the heat-conducting element 13.

[0041] Determining whether there is liquid flow in fluid channel 11 based on temperature includes: When the temperature is lower than the preset threshold, it is determined that there is liquid flow in the fluid channel 11; When the temperature is equal to or higher than a preset threshold, it is determined that the liquid flow in fluid channel 11 has decreased or there is no liquid flow in fluid channel 11. After determining that the liquid flow in fluid channel 11 has decreased or there is no liquid flow in fluid channel 11, one or more of the following operations are performed (the execution can be immediate or after a certain period of time (e.g., after a few seconds)): The control signal generator sends a water shortage signal; the signal generator can be an audio and / or visual signal generator, which can remind the user that the cleaning equipment needs to be added with cleaning fluid; Control the steam generator and / or liquid heater to stop working; upon receiving a signal, the main control board of the cleaning equipment or its associated control board controls the steam generator and / or liquid heater to stop working to avoid damage to the equipment due to lack of liquid; The controller stops the heating element 12 from working; the controller controls the heating element 12 to continue working to prevent it from causing damage to itself and / or surrounding components.

[0042] This application also includes a liquid shortage detection device 1, which includes: Heating element 12 is used to heat the heat-conducting component 13 that is in contact with the liquid in the fluid channel 11; Temperature sensor 14 acquires the temperature of the heat-conducting component 13 itself or the temperature around the heat-conducting component 13; The controller determines whether there is liquid flow in the fluid channel 11 based on the temperature.

[0043] The specific structure of the liquid shortage detection device 1 will not be described in detail here, but can be referred to the relevant structure in the above embodiments.

[0044] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A liquid shortage detection device, characterized in that, include: Fluid channels for the flow of liquid; A heating element is disposed around or inside the fluid channel to generate heat; A heat-conducting element is used to conduct at least a portion of the heat generated by the heating element to a fluid, so that the flow of liquid in the fluid channel carries away at least a portion of the heat located in the heat-conducting element; A temperature sensor is used to detect the ambient temperature. The temperature sensor is disposed around the heating element or the heat-conducting component, or the temperature sensor is disposed adjacent to the heating element or the heat-conducting component. The controller determines whether there is liquid flow in the fluid channel based on the signal transmitted by the temperature sensor.

2. The liquid shortage detection device as described in claim 1, characterized in that, Includes a conduit defining the fluid passage, and the heat-conducting element is part of the conduit.

3. The liquid shortage detection device as described in claim 1, characterized in that, The device includes a housing that defines a first cavity and a second cavity, the thermally conductive element separating the first cavity and the second cavity, the second cavity being part of the fluid channel.

4. The liquid shortage detection device as described in claim 3, characterized in that, Both the heating element and the temperature sensor are disposed in the first cavity, and the first cavity is provided with a heat-conducting medium.

5. The liquid shortage detection device as described in claim 3 or 4, characterized in that, It also includes a circuit board, at least a portion of which is disposed within the first cavity, with the heating element and the temperature sensor disposed on the side of the circuit board facing the heat-conducting element.

6. The liquid shortage detection device as described in claim 3 or 4, characterized in that, It also includes a positive electrode and a negative electrode, both of which are disposed in the second cavity.

7. A liquid shortage detection device, disposed in a pipeline, said pipeline defining a fluid channel for liquid flow; characterized in that, The fluid shortage detection device includes: A heating element is disposed on the outer periphery of the pipe to generate heat; A heat-conducting element is used to conduct at least a portion of the heat generated by the heating element to the pipeline, so that the flow of liquid in the fluid channel carries away at least a portion of the heat located in the heat-conducting element; A temperature sensor for detecting the temperature around it, the temperature sensor being disposed around the heating element or the heat-conducting element, or the temperature sensor being disposed adjacent to the heating element or the heat-conducting element; The controller determines whether there is liquid flow in the fluid channel based on the signal transmitted by the temperature sensor.

8. The liquid shortage detection device as described in claim 7, characterized in that, The heat-conducting element is configured to at least surround a portion of the piping.

9. The liquid shortage detection device as described in claim 7, characterized in that, The liquid shortage detection device is detachably installed in the pipeline.

10. A wet cleaning device, characterized in that, The system includes a cleaning fluid supply system, which comprises a cleaning fluid tank and a supply pipeline, wherein the supply pipeline includes a low fluid detection device as described in any one of claims 1-9.

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