Water level probe, measuring device and electrical equipment

Abstract

The invention relates to the technical field of water level measurement, and discloses a water level probe, a measuring device and electrical equipment. The water level probe comprises a probe body, a water containing gap is formed between a resistance piece and a conductive piece, and water in the resistance piece, the conductive piece and the water containing gap can form a slide rheostat structure; the shell sleeves the periphery of the probe body; and the shell is made of a waterproof, moisture-permeable and insulating material. The shell on the periphery of the probe body is made of waterproof, moisture-permeable and insulating materials, the water levels inside and outside the shell are always kept consistent, and the effective resistance value of a slide rheostat structure formed by water in the resistor piece, the conductive piece and the water containing gap can change along with the water levels; the purpose of continuously monitoring the water level is achieved; and the shell is made of a waterproof, moisture-permeable and insulating material, so that water in the water level probe and water outside the water level probe cannot form a continuous path, the whole water body is prevented from being electrified, and the measurement safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water level measurement, and particularly relates to a water level probe, a measurement device and an electrical appliance. Background Art

[0002] Generally, the water level probes on the market can only detect the water level at a certain fixed height and cannot continuously measure the change of the water level, which is particularly insufficient in application scenarios where real-time monitoring of the water level change is required.

[0003] In most of the related technologies, the water level measurement method relies on the conductive property of water. The end of the water level probe is usually two exposed electrodes. Specifically, by passing an electric current through the entire water area and using the water itself as a part of the circuit to form a loop, the height of the water level is judged in this way. Although this method has a simple principle, there may be a potential safety threat to people during the measurement process because the entire water area is electrified. Summary of the Invention

[0004] In view of this, the present invention provides a water level probe and a measurement device to solve the problem that the water level probe cannot ensure safety while continuously measuring the water level.

[0005] In a first aspect, the present invention provides a water level probe, comprising:

[0006] A probe body, comprising a resistance element and a conductive element, with a water-containing gap formed between the resistance element and the conductive element; the resistance element, the conductive element and the water in the water-containing gap can form a slide rheostat structure;

[0007] A housing, sleeved around the periphery of the probe body; the housing is made of a waterproof, moisture-permeable and insulating material; the water of the water body to be measured is suitable for entering the water level probe discontinuously through the housing and then entering the water-containing gap.

[0008] Beneficial effects: A housing is provided around the probe body. The housing is made of a waterproof, moisture-permeable and insulating material, allowing water in the water body to be measured to enter the inside of the water level probe in a discontinuous form (such as in the form of discontinuous water droplets or water molecules), and then enter the water-containing gap formed between the resistance element and the conductive element. Since the water levels inside and outside the housing always remain the same, the water level in the water-containing gap will change in real time with the change of the measured water level, causing a change in the effective length of the resistance element connected. After the resistance element and the conductive element are connected to a power supply to form an electrical circuit, the effective resistance value of the sliding rheostat structure composed of the resistance element, the conductive element and the water in the water-containing gap will change with the water level, thereby causing a change in the current in the electrical circuit. By monitoring and recording the change in current and obtaining the change in resistance value, the effective length of the resistance element connected to the electrical circuit can be deduced, and the change in water level can be calculated, thus achieving the purpose of continuously monitoring the water level. Moreover, since the housing is made of a waterproof, moisture-permeable and insulating material, the water inside the water level probe (inside the housing) and the water outside the water level probe (outside the housing) will not form a continuous path, and the entire water body will not be electrified, improving the measurement safety.

[0009] In an optional embodiment, the resistance element includes a resistance wire, and the conductive element is a tubular conductive element sleeved around the resistance wire; the conductive element is provided with a water passing through hole; the water-containing gap is formed between the conductive element and the resistance wire.

[0010] Beneficial effects: The tubular conductive element is sleeved around the resistance wire to form the probe body, with a simple structure; the water passing through hole is provided on the conductive element, facilitating the flow of water into the water-containing gap.

[0011] In an optional embodiment, the resistance wire is provided with a resistance wire outlet end adapted to be connected to a power supply.

[0012] Beneficial effects: The resistance wire outlet end is provided, facilitating the connection to the power supply through a wire.

[0013] In an optional embodiment, the conductive element is provided with a conductive element outlet end adapted to be connected to a power supply.

[0014] Beneficial effects: The conductive element outlet end is provided, facilitating the connection to the power supply through a wire.

[0015] In an optional embodiment, the housing includes:

[0016] A receiving chamber, in which the resistance wire and the conductive element are installed;

[0017] A first outlet hole communicating with the receiving chamber, through which the resistance wire outlet end is led out;

[0018] The second wire outlet hole is communicated with the accommodation chamber, and the conductive wire outlet end is led out through the second wire outlet hole.

[0019] Advantageous effects: The first wire outlet hole and the second wire outlet hole are provided on the outer shell to lead out the resistor wire outlet end and the conductive wire outlet end, which are respectively connected to the positive and negative electrodes of the power supply, thereby forming an electric circuit.

[0020] In an alternative embodiment, a plurality of the water passing through holes are distributed on the conductive member.

[0021] Advantageous effects: A plurality of water passing through holes are distributed on the wall surface of the conductive member, facilitating the rapid and uniform passage of water through the conductive member into the water storage gap, making a rapid and accurate response to the water level change, and improving the measurement sensitivity.

[0022] In an alternative embodiment, the outer shell is a porous nano-ceramic outer shell, a porous plastic outer shell or a fabric outer shell.

[0023] Advantageous effects: The outer shell is a porous nano-ceramic outer shell, a porous plastic outer shell or a fabric outer shell, taking into account both waterproof and moisture-permeable properties and insulation performance, realizing continuous monitoring of water level changes, and avoiding the electrification of the entire water body, improving the measurement safety.

[0024] In an alternative embodiment, a hydrophobic layer is provided on the inner wall of the outer shell.

[0025] Advantageous effects: After a hydrophobic layer is provided on the inner wall of the outer shell, the outer shell and the hydrophobic layer constitute a double protection, further preventing the formation of a continuous path of water inside and outside the outer shell, eliminating the possibility of the electrification of the entire water body during the measurement process, effectively improving the measurement safety, and enhancing the user experience.

[0026] In an alternative embodiment, the hydrophobic layer is coated on the inner wall surface of the outer shell.

[0027] Advantageous effects: By adopting the coating method, the connection reliability between the hydrophobic layer and the outer shell is high, and the manufacturing process is simple.

[0028] In a second aspect, the present invention further provides a measuring device, including:

[0029] A power supply;

[0030] The water level probe as described in any one of the above, the resistor member and the conductive member are respectively connected to the positive and negative electrodes of the power supply.

[0031] Advantageous effects: Since the measuring device includes the water level probe of the present invention, it has the same technical effects as the water level probe, which will not be elaborated here.

[0032] In a third aspect, the present invention further provides an electrical equipment, including:

[0033] Water tank;

[0034] The water level probe described in any one of the above or the above-mentioned measuring device; the water level probe is disposed in the water tank.

[0035] Advantageous effects: The water level probe is disposed in the water tank of the electrical equipment. The water level probe can continuously monitor the change of the water level in the water tank, and the water body in the water tank will not be charged as a whole during the measurement process, thereby improving the electrical safety of the electrical equipment, not affecting the normal operation of the electrical equipment, and facilitating the controller to make timely responses and issue action instructions according to the change of the water level.

[0036] In an optional embodiment, the electrical equipment is a steam oven, a humidifier or a water dispenser.

[0037] Advantageous effects: Electrical equipment such as steam ovens, humidifiers and water dispensers adopt the water level probe of the present invention to realize continuous monitoring of the water level in the water tank, and avoid charging of the entire water body. While the electrical equipment operates reliably, the safety is effectively improved, and the user satisfaction is improved. Description of the Drawings

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 Is a perspective view of a water level probe according to an embodiment of the present invention;

[0040] Figure 2 Is Figure 1 The cross-sectional view of the water level probe in

[0041] Figure 3 Is Figure 2 The partial enlarged schematic view of part A in

[0042] Figure 4 Is a three-dimensional structure diagram of a probe body according to an embodiment of the present invention;

[0043] Figure 5 Is Figure 4 The cross-sectional structure diagram of the probe body in

[0044] Figure 6 Is Figure 5 The partial enlarged schematic view of part B in

[0045] Figure 7 Is a structural schematic diagram of a housing according to an embodiment of the present invention;

[0046] Figure 8 is Figure 7 a sectional view of the outer shell;

[0047] Figure 9 is Figure 8 a partially enlarged schematic view of part C in;

[0048] Figure 10 a three-dimensional structure diagram of a resistor component according to an embodiment of the present invention;

[0049] Figure 11 is Figure 10 a sectional view of the resistor component in;

[0050] Figure 12 is a schematic diagram showing the relationship between the water level change and the effective length change of the resistor component.

[0051] Explanation of reference numerals:

[0052] 1. Probe body;

[0053] 11. Resistor component; 111. Resistor lead-out end;

[0054] 12. Conductive member; 121. Conductive lead-out end; 122. Water-passing through hole;

[0055] 2. Outer shell;

[0056] 21. First lead-out hole;

[0057] 3. Water-containing gap;

[0058] 4. Hydrophobic layer. Detailed implementation manners

[0059] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0060] In the description of the invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0061] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Generally, the water level probes on the market can only detect the water level at a certain fixed height and cannot continuously measure the change of the water level, which is particularly insufficient in application scenarios where real-time monitoring of the water level change is required.

[0063] Most of the water level measurement methods in the related art rely on the conductive characteristics of water, and the ends are usually two bare electrodes. Specifically, by passing an electric current through the entire water area and using the water itself as a part of the circuit to form a loop, the height of the water level is judged in this way. Although this method has a simple principle, it has many limitations in practical applications. First, it can only provide the water level information at specific points and cannot comprehensively reflect the overall change trend of the water level. Second, since the entire water area is electrified, this method may pose a potential safety threat to people. Water is a good conductor. When using a current loop type water level detector to detect the water level, because the test range cannot be strictly controlled in a certain area, when the water level rises to a certain height, it will cause the entire water area to be electrified instantaneously at a certain moment, causing certain safety hazards. In addition, when there are impurities in the water or the water quality is poor, it may also affect the measurement accuracy. In view of this, the present invention is proposed.

[0064] The following will be combined with Figures 1 to 12 , to describe the embodiments of the present invention.

[0065] According to an embodiment of the present invention, on the one hand, as Figures 1 to 3 shown, a water level probe is provided, including:

[0066] The probe body 1 includes a resistive element 11 and a conductive element 12, and a water-containing gap 3 is formed between the resistive element 11 and the conductive element 12; the resistive element 11, the conductive element 12, and the water in the water-containing gap 3 can form a slide rheostat structure;

[0067] The outer shell 2 is sleeved on the periphery of the probe body 1; the outer shell 2 is made of a waterproof, moisture-permeable and insulating material; the water of the water body to be measured is suitable for entering the water level probe discontinuously through the outer shell 2 and then entering the water-containing gap 3. For the structure of the outer shell 2, see Figures 7 - 9 .

[0068] An outer shell 2 is arranged on the periphery of the probe body 1. The outer shell 2 is made of a waterproof, moisture-permeable and insulating material, so that the outer shell 2 allows the water in the water body to be measured to enter the interior of the water level probe in a discontinuous form (such as in the form of discontinuous water droplets or water molecules), and then enter the water-containing gap 3 formed between the resistive element 11 and the conductive element 12. Since the water levels inside and outside the outer shell 2 always remain the same, the water level in the water-containing gap 3 will change in real time with the change of the measured water level, causing the effective length of the resistive element 11 connected to change; after the resistive element 11 and the conductive element 12 are connected to the power supply to form an electrical circuit, the effective resistance value of the slide rheostat structure composed of the resistive element 11, the conductive element 12, and the water in the water-containing gap 3 will change with the water level, and then cause the current in the electrical circuit to change; by monitoring and recording the change of the current, obtaining the change of the resistance value, the effective length of the resistive element 11 connected to the electrical circuit can be inversely deduced, and the water level change can be calculated, thus achieving the purpose of continuously monitoring the water level. Moreover, since the outer shell 2 is made of a waterproof, moisture-permeable and insulating material, the water inside the water level probe (inside the outer shell 2) and the water outside the water level probe (outside the outer shell 2) will not form a continuous path, and will not cause the entire water body to be electrified, improving the measurement safety.

[0069] The water level probe and the external water body form a communicating vessel. According to Pascal's law, in the same kind of liquid in a communicating vessel, the pressures at points with the same depth are equal. When the liquid is stationary, the pressures on the liquid at the same horizontal plane inside and outside the water level probe (inside and outside the outer shell 2) are equal, so the liquid levels will remain at the same height, that is, the water level inside the water level probe is the same as the external water level. Therefore, the change of the water level inside the water level probe can reflect the change of the water level of the external water body.

[0070] The expression of Ohm's law is R = ρL / S, where R represents resistance, ρ represents resistivity (a constant related to the material), L represents the length of the resistance wire, and S represents the cross-sectional area of the resistance wire.

[0071] For a slide rheostat, when the slide moves, the length of the resistance wire connected to the circuit changes, thereby changing the resistance value connected to the circuit. Assume that the total resistance of the slide rheostat is R 总 , and the total length is L总 , the effective resistance of the access circuit is R 有效 , the length of the resistance wire in the access circuit is L 有效 , since the material and cross-sectional area of the sliding rheostat are fixed, its resistivity ρ and cross-sectional area S remain unchanged.

[0072] According to the resistance law, we can get: R 有效 / R 总 = L 有效 / L 总 , that is, L 有效 = R 有效 ·L 总 / R 总 .

[0073] R 有效 = U / I, and by measuring the current I, R can be obtained 有效 , and then the length L of the resistance wire in the access circuit can be obtained 有效 , as shown in the figure, the water level is inversely proportional to L 有效 , and the change in the water level is equal to the change in L 有效 , and the change in L 有效 directly reflects the change in the water level. Therefore, by monitoring the current I, continuous monitoring of the water level change can be achieved.

[0074] Such as Figure 12 shown, the effective length L of the resistance wire during the water level change is given 有效 = L1 and L 有效 = L2 for two cases of state diagrams.

[0075] In some embodiments, such as Figures 4 - 6 shown, the resistance member 11 includes a resistance wire, the conductive member 12 is a tubular conductive member 12, and the conductive member 12 is sleeved around the periphery of the resistance wire; the conductive member 12 is provided with a water passing through hole 122; such as Figure 3 shown, the water holding gap 3 is formed between the conductive member 12 and the resistance wire.

[0076] The tubular conductive member 12 is sleeved around the periphery of the resistance wire to form the probe body 1, with a simple structure; a water passing through hole 122 is provided on the conductive member 12 to facilitate the water flow into the water holding gap 3.

[0077] The resistance wire is usually made of alloy materials with relatively high resistivity, such as nickel-chromium alloy, constantan, manganin, etc. When the water level changes, the length or area of the contact between the water and the resistance wire changes accordingly. Since water has certain conductivity, the effective resistance value of the sliding rheostat where the resistance wire is located will change accordingly. By measuring the change in the effective resistance value, the height of the water level can be calculated.

[0078] In some embodiments, such as Figure 10 and Figure 11 shown, the resistance wire is provided with a resistance wire outlet end 111, and the resistance wire outlet end 111 is adapted to be connected to a power source.

[0079] The provision of the resistance wire outlet end 111 facilitates connection to the power source through a wire.

[0080] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 shown, the conductive member 12 is provided with a conductive wire outlet end 121, and the conductive wire outlet end 121 is adapted to be connected to a power source.

[0081] The provision of the conductive wire outlet end 121 facilitates connection to the power source through a wire.

[0082] In some embodiments, such as Figure 8 shown, the housing 2 includes:

[0083] A receiving chamber, in which the resistance wire and the conductive member 12 are installed;

[0084] A first wire outlet hole 21, which communicates with the receiving chamber, and the resistance wire outlet end 111 is led out through the first wire outlet hole 21;

[0085] A second wire outlet hole, which communicates with the receiving chamber, and the conductive wire outlet end 121 is led out through the second wire outlet hole.

[0086] The provision of the first wire outlet hole 21 and the second wire outlet hole on the housing 2 leads out the resistance wire outlet end 111 and the conductive wire outlet end 121, which are respectively connected to the positive and negative electrodes of the power source, thereby forming an electrical circuit.

[0087] In some embodiments, such as Figure 4 shown, a plurality of the water passing through holes 122 are distributed on the conductive member 12.

[0088] The plurality of water passing through holes 122 are distributed on the wall surface of the conductive member 12, facilitating the rapid and uniform passage of water through the conductive member 12 into the water containing gap 3, making a rapid and accurate response to the water level change, and improving the measurement sensitivity.

[0089] In some embodiments, the housing 2 is a porous nano-ceramic housing 2, a porous plastic housing 2 or a fabric housing 2.

[0090] The housing 2 being a porous nano-ceramic housing 2, a porous plastic housing 2 or a fabric housing 2 takes into account both waterproof and moisture-permeable properties and insulation performance, realizes continuous monitoring of the water level change, and avoids the electrification of the entire water body, improving the measurement safety.

[0091] In some embodiments, such as Figure 9As shown, a hydrophobic layer 4 is provided on the inner wall of the outer shell 2.

[0092] After the hydrophobic layer 4 is provided on the inner wall of the outer shell 2, the outer shell 2 and the hydrophobic layer 4 constitute a double protection, further preventing the formation of a continuous path of water inside and outside the outer shell 2, eliminating the possibility of the entire water body being charged during the measurement process, effectively improving the measurement safety, and enhancing the user experience.

[0093] Of course, in some other embodiments, a hydrophobic layer 4 can also be provided on the outer side of the outer shell 2, which can also achieve the purpose of preventing the formation of a continuous path of water inside and outside the outer shell 2.

[0094] It should be noted that the hydrophobic layer 4 is a material layer with hydrophobic properties, that is, the surface of this material is not easily wetted by water, and water will form water droplets and roll off on its surface. The following are several common materials of the hydrophobic layer 4:

[0095] Fluoropolymers: Such as polytetrafluoroethylene, which has an extremely low surface energy, a very large contact angle of water on its surface, and can effectively achieve the hydrophobic effect. It has stable chemical properties and strong corrosion resistance, and is widely used in various occasions requiring hydrophobic properties;

[0096] Silicone-based materials: Such as silicone rubber, by performing special treatments on its surface, such as chemical modification or adding hydrophobic additives, it can be made to have good hydrophobicity; silicone-based materials have good flexibility and high-temperature resistance, and are suitable for some hydrophobic applications with requirements for material flexibility and heat resistance;

[0097] Carbon nanomaterials: Such as carbon nanotubes, graphene, etc. These materials themselves have certain hydrophobic characteristics, and due to their nanoscale structure and large specific surface area, they can achieve good hydrophobic effects with a small amount of use; at the same time, they also have excellent mechanical properties and electrical conductivity, and can be used in some high-performance hydrophobic composite materials.

[0098] In some embodiments, the hydrophobic layer 4 is coated on the inner wall surface of the outer shell 2.

[0099] By adopting the coating method, the connection reliability between the hydrophobic layer 4 and the outer shell 2 is high, and the manufacturing process is simple.

[0100] In some embodiments, such as Figures 1 - 11As shown in the figure, the water level probe includes a housing 2, a conductive member 12 (conductive layer) and a resistance wire. A hydrophobic coating is provided on the inner side of the housing 2. The housing 2 is a porous nano-ceramic housing 2. The porous nano-ceramic housing 2 wraps the conductive member 12 (layer) and the resistance wire inside the probe. The porous structure inside the housing 2 allows water molecules to pass through. The function of the hydrophobic layer 4 is to use its hydrophobicity to prevent the water inside the water level probe from forming a continuous path with the water outside the water level probe, preventing the entire water body from being charged. The role of the conductive layer in the solution is to form a circuit loop with the water inside the water level probe and the resistance wire. The installation position is the inner wall of the porous nano-ceramic housing 2. The role of the resistance wire is to form a sliding rheostat with the water inside the water level probe and the conductive layer. By changing the water level, the change in the magnitude of the current passing through is affected, thereby measuring the water level. The water level probe can continuously measure the change in the water level and ensure that the entire water body will not be charged, effectively reducing potential safety hazards.

[0101] According to an embodiment of the present invention, on the other hand, a measuring device is further provided, including:

[0102] A power supply;

[0103] A water level probe, wherein the resistance member 11 and the conductive member 12 are respectively connected to the positive and negative electrodes of the power supply.

[0104] Since the measuring device includes the water level probe of the present invention, it has the same technical effects as the water level probe, which will not be elaborated here.

[0105] According to an embodiment of the present invention, on yet another aspect, an electrical device is further provided, including:

[0106] A water tank;

[0107] A water level probe or a measuring device; the water level probe is arranged in the water tank.

[0108] The water level probe is arranged in the water tank of the electrical device. The water level probe can continuously monitor the change in the water level in the water tank, and the water body in the water tank will not be charged as a whole during the measurement process, thereby improving the electrical safety of the electrical device, not affecting the normal operation of the electrical device, and facilitating the controller to make timely responses and issue action instructions according to the change in the water level.

[0109] The working process of the water level probe is as follows:

[0110] First, insert the conductive member 12 into the porous nano-ceramic housing 2, then insert the resistance wire into the conductive layer, and vertically insert the entire water level probe into the water tank. Water molecules or water droplets can enter the interior of the water level probe through the gaps in the porous nano-ceramic housing 2. The entire water level probe and the water inside the water level probe form a sliding rheostat. Since the inner side of the porous nano-ceramic housing 2 has a hydrophobic layer 4, the water inside the water level probe and the water outside the water level probe do not form a continuous path, so the water outside the water level probe will not be electrified. When the water level changes, the resistance value of the resistance wire changes due to the change in the water level, so the current changes, and thus the specific value of the water level change can be measured.

[0111] During measurement, the water level probe can be inserted to the bottom of the water tank to monitor the change of the water level in the entire water tank, or it can be inserted to a specified depth to monitor the change of the water level at the specified depth. Of course, in either case, one end of the connecting wire of the water level probe needs to be set outside the liquid level, and the entire water level probe cannot be completely immersed in the water body.

[0112] In some embodiments, the electrical device is a steam oven, a humidifier or a water dispenser.

[0113] Electrical devices such as steam ovens, humidifiers and water dispensers adopt the water level probe of the present invention to realize continuous monitoring of the water level in the water tank, and avoid electrification of the entire water body. While the electrical device operates reliably, its safety is effectively improved, and the user satisfaction is enhanced.

[0114] In addition, electrical devices that need to measure the water level in the water tank, such as water heaters, dishwashers, washing machines, steam generators, etc., can also adopt the water level probe of the present invention to realize continuous monitoring of the water level while avoiding electrification of the entire water body and improving electrical safety.

[0115] The resistance wire, the conductive member 12 and the water inside the water level probe of the water level probe of the present invention form a sliding rheostat structure. The resistance value of the resistance wire is changed by the change of the water level height, so as to continuously detect the water level. At the same time, a layer of porous nano-ceramic is wrapped outside the probe body 1, and a hydrophobic coating is applied on the inner side of the porous nano-ceramic. Such a setting can not only ensure the passage of water molecules, but also prevent the water inside and outside the water level probe from forming a continuous path, resulting in the electrification of the water body outside the probe.

[0116] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A water level probe, characterized in that: include: The probe body (1) comprises a resistor (11) and a conductive member (12), wherein a water-containing gap (3) is formed between the resistor (11) and the conductive member (12); the resistor (11), the conductive member (12) and the water in the water-containing gap (3) can form a sliding rheostat structure; The outer shell (2) is sleeved on the periphery of the probe body (1); the outer shell (2) is made of a waterproof, moisture-permeable and insulating material; water in the water body to be measured is suitable for discontinuously entering the water level probe through the outer shell (2) and then entering the water-containing gap (3).

2. The water level probe according to claim 1, characterized in that: The resistor (11) comprises a resistance wire, the conductive member (12) is a tubular conductive member (12), and the conductive member (12) is sleeved around the outer periphery of the resistance wire; the conductive member (12) is provided with a water-passing hole (122); and the water-containing gap (3) is formed between the conductive member (12) and the resistance wire.

3. The water level probe according to claim 2, characterized in that: The resistance wire is provided with a resistance outlet terminal (111), and the resistance outlet terminal (111) is suitable for connecting to a power source.

4. The water level probe according to claim 3, characterized in that: The conductive member (12) is provided with a conductive outlet terminal (121), and the conductive outlet terminal (121) is suitable for connecting to a power source.

5. The water level probe according to claim 4, characterized in that: The housing (2) comprises: a containing chamber, in which the resistance wire and the conductive member (12) are installed; A first wire outlet hole (21) is connected to the accommodating chamber, and the resistor outlet terminal (111) is led out through the first wire outlet hole (21); The second wire outlet hole is connected to the accommodating chamber, and the conductive wire outlet terminal (121) is led out from the second wire outlet hole.

6. The water level probe according to claim 2, characterized in that: A plurality of water through holes (122) are distributed on the conductive member (12).

7. The water level probe according to claim 1, characterized in that: The shell (2) is a porous nano-ceramic shell (2), a porous plastic shell (2) or a fabric shell (2).

8. The water level probe according to any one of claims 1 to 7, characterized in that: The inner wall of the outer shell (2) is provided with a hydrophobic layer (4).

9. The water level probe according to claim 8, characterized in that: The hydrophobic layer (4) is coated on the inner wall surface of the outer shell (2).

10. A measuring device, characterized in that: include: power supply; In the water level probe according to any one of claims 1 to 9, the resistor (11) and the conductive member (12) are respectively connected to the positive electrode and the negative electrode of the power source.

11. An electrical device, characterized in that: include: Water tank; The water level probe according to any one of claims 1 to 9 or the measuring device according to claim 10; The water level probe is arranged in the water tank.

12. The electrical device according to claim 11, characterized in that: The electrical equipment is a steam oven, a humidifier or a water dispenser.

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