Water level probe, measuring device and electrical equipment

Abstract

The utility model 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 utility model relates to water level measurement technical field, concretely relates to a water level probe, measuring device and electrical equipment. BACKGROUND

[0002] The water level probe on the market can generally only detect the water level of a fixed height, and cannot realize continuous measurement of the change of the water level, which is particularly insufficient in application scenarios that require real-time monitoring of the change of the water level.

[0003] Most water level measurement methods in the related art rely on the conductivity of water. The end of the water level probe is usually two exposed electrodes. Specifically, current is passed through the entire water area, and the water itself is used as part of the circuit to form a loop to determine the height of the water level. Although this method is simple in principle, the entire water area is electrified during the measurement process, which may pose a potential safety threat to people. SUMMARY

[0004] Therefore, the utility model provides a water level probe and a measuring device to solve the problem that the water level probe cannot continuously measure the water level while ensuring safety.

[0005] In a first aspect, the utility model provides a water level probe, comprising:

[0006] The probe body comprises a resistor and a conductor, and a water-containing gap is formed between the resistor and the conductor. The resistor, the conductor, and the water in the water-containing gap can form a sliding rheostat structure.

[0007] The shell is made of a waterproof and moisture-permeable insulating material. The water of the water body to be measured can enter the water level probe discontinuously through the shell and then enter the water-containing gap.

[0008] Beneficial effects: The shell is arranged on the periphery of the probe body, and is made of waterproof, moisture-permeable and insulating material, so that the shell allows water in the water body to be measured to enter the water level probe in a discontinuous form (for example, in the form of discontinuous water droplets or water molecules), and then enter the water-containing gap between the resistor and the conductive member. Since the water levels inside and outside the shell are always consistent, the water level in the water-containing gap changes in real time with the change of the measured water level, so that the effective length of the resistor connected changes. After the resistor and the conductive member are connected to the power supply to form an electric circuit, the effective resistance of the sliding resistor structure formed by the resistor, the conductive member and the water in the water-containing gap changes with the change of the water level, thereby causing the current in the electric circuit to change. By monitoring and recording the change of the current, the change of the resistance value is obtained, and the effective length of the resistor connected in the electric circuit is inversely deduced, the change of the water level is calculated, and the purpose of continuously monitoring the water level is achieved. Moreover, since the shell is made of waterproof, moisture-permeable and insulating material, the water inside the water level probe (in the shell) and the water outside the water level probe (outside the shell) do not form a continuous path, and the entire water body is not electrified, thereby improving the measurement safety.

[0009] In an alternative embodiment, the resistor comprises a resistor wire, the conductive member is a tubular conductive member, and the conductive member is sleeved on the periphery of the resistor wire; the conductive member is provided with a water passing hole; and the water-containing gap is formed between the conductive member and the resistor wire.

[0010] Beneficial effects: The tubular conductive member is sleeved on the periphery of the resistor wire to form the probe body, and the structure is simple; the water passing hole is arranged on the conductive member to facilitate the water flow into the water-containing gap.

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

[0012] Beneficial effects: The resistor wire outlet end is arranged to facilitate the connection to the power supply through the wire.

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

[0014] Beneficial effects: The conductive wire outlet end is arranged to facilitate the connection to the power supply through the wire.

[0015] In an alternative embodiment, the shell comprises:

[0016] a containing chamber, in which the resistor wire and the conductive member are installed;

[0017] a first wire outlet hole communicating with the containing chamber, and the resistor wire outlet end is led out from the first wire outlet hole;

[0018] A second wire outlet hole is in communication with the accommodating chamber, and the conductive wire outlet end is led out by the second wire outlet hole.

[0019] Beneficial effects: the first wire outlet hole and the second wire outlet hole are arranged on the shell, and the resistance wire outlet end and the conductive wire outlet end are led out and connected with the positive and negative poles of the power supply respectively, so as to form an electric circuit.

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

[0021] Beneficial effects: the plurality of water passing through holes are distributed on the wall surface of the conductive part, so that water can quickly and uniformly pass through the conductive part into the water containing gap, and the water level change can be quickly and accurately responded, and the measurement sensitivity is improved.

[0022] In an alternative embodiment, the shell is a porous nanoceramic shell, a porous plastic shell or a fabric shell.

[0023] Beneficial effects: the shell is a porous nanoceramic shell, a porous plastic shell or a fabric shell, which has waterproof and moisture permeable and insulating properties, realizes continuous monitoring of the water level change, avoids the whole water body being electrified, and improves the measurement safety.

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

[0025] Beneficial effects: after the hydrophobic layer is arranged on the inner wall of the shell, the shell and the hydrophobic layer constitute double protection, which further prevents the water inside and outside the shell from forming a continuous path, eliminates the possibility of the whole water body being electrified during the measurement process, effectively improves the measurement safety, and improves the user experience.

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

[0027] Beneficial effects: the coating method is adopted, the connection reliability of the hydrophobic layer and the shell is high, and the manufacturing process is simple.

[0028] In a second aspect, the utility model also provides a kind of measuring device, comprising:

[0029] Power supply;

[0030] The water level probe of any one of the above, the resistance part and the conductive part are connected to the positive and negative poles of the power supply respectively.

[0031] Beneficial effects: since the measuring device includes the water level probe of the utility model, it has the same technical effects as the water level probe, which will not be repeated here.

[0032] In a third aspect, the utility model also provides a kind of electrical equipment, comprising:

[0033] water tank;

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

[0035] Beneficial effects: the water level probe is arranged in the water tank of the electrical appliance, 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 is not charged as a whole during the measuring process, thereby improving the electrical safety of the electrical appliance, not affecting the normal operation of the electrical appliance, and facilitating the controller to timely respond and issue an action instruction according to the change of the water level.

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

[0037] Beneficial effects: the water level probe of the electrical appliance such as the steam oven, the humidifier and the water dispenser realizes continuous monitoring of the water level of the water tank, avoids charging of the whole water body, effectively improves the safety of the reliable operation of the electrical appliance, and improves the user satisfaction. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specific embodiments or the related art of the present application, the drawings needed to be used in the specific embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0039] Figure 1 It is a perspective view of a water level probe of an embodiment of the present application;

[0040] Figure 2 It is a perspective view of a water level probe of an embodiment of the present application; Figure 1 It is a sectional view of the water level probe;

[0041] Figure 3 It is a perspective view of a water level probe of an embodiment of the present application; Figure 2 It is a local enlarged schematic view of part A;

[0042] Figure 4 It is a perspective view of a probe body of an embodiment of the present application;

[0043] Figure 5 It is a perspective view of a probe body of an embodiment of the present application; Figure 4 It is a sectional view of the probe body;

[0044] Figure 6 It is a perspective view of a probe body of an embodiment of the present application; Figure 5 It is a local enlarged schematic view of part B;

[0045] Figure 7A structure schematic view of a shell of an embodiment of the present utility model;

[0046] Figure 8 For Figure 7 A sectional view of the shell;

[0047] Figure 9 For Figure 8 A local enlarged schematic view of C part;

[0048] Figure 10 A three-dimensional structure view of a resistance piece of an embodiment of the present utility model;

[0049] Figure 11 For Figure 10 A sectional view of the resistance piece;

[0050] Figure 12 A relationship schematic view of water level change and effective length change of the resistance piece.

[0051] Mark explanation:

[0052] 1, probe body;

[0053] 11, resistance piece; 111, resistance outgoing terminal;

[0054] 12, conducting piece; 121, conducting outgoing terminal; 122, water passing through hole;

[0055] 2, shell;

[0056] 21, first outgoing hole;

[0057] 3, water containing gap;

[0058] 4, hydrophobic layer. Specific implementation

[0059] In order to make the purpose, technical scheme and advantage of the embodiment of the present utility model more clear, the technical scheme in the embodiment of the present utility model will be described clearly and completely below by combining with the drawings in the embodiment of the present utility model, obviously, the described embodiment is a part of the embodiment of the present utility model, rather than all the embodiment. Based on the embodiment in the present utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the protection scope of the present utility model.

[0060] In the description of the utility model, it needs to be explained that, unless otherwise specified, the meaning of "multiple" is two or more than two; The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0061] In the description of the utility model, it also needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be mechanically connected, or it can be electrically connected; It can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0062] The water level probe on the market can generally only detect the water level of a fixed height, and cannot realize continuous measurement of the change of the water level, which is particularly insufficient in application scenarios that need to monitor the change of the water level in real time.

[0063] Most water level measurement methods in the related art rely on the conductivity of water, and the terminal is usually two exposed electrodes. Specifically, the height of the water level is determined by passing current through the entire water area and using the water itself as part of the circuit to form a loop. Although this method is simple in principle, it has many limitations in practical application. First of all, it can only provide water level information at a specific point and cannot fully reflect the overall trend of the water level. Secondly, since the entire water area is electrified, this method may pose a potential safety threat to people. Water is a good conductor, and when a current loop type water level detector is used to detect the water level, since the test range cannot be strictly controlled in a certain area, when the water level rises to a certain height, the entire water area will be electrified at a certain moment, causing certain safety hazards. In addition, when the water contains impurities or the water quality is poor, it may also affect the accuracy of the measurement. In view of this, the utility model is proposed.

[0064] The embodiments of the utility model will be described below in conjunction with Figures 1 to 12 .

[0065] According to the embodiments of the utility model, on the one hand, as Figures 1 to 3 indicated, a water level probe is provided, comprising:

[0066] The probe body 1 comprises a resistance element 11 and a conductive element 12, and a water-containing gap 3 is formed between the resistance element 11 and the conductive element 12; the resistance element 11, the conductive element 12 and the water in the water-containing gap 3 can constitute a sliding rheostat structure.

[0067] The shell 2 is sleeved on the periphery of the probe body 1; the shell 2 is made of a waterproof, moisture-permeable and insulating material; and the water in the water body to be measured is adapted to enter the water level probe discontinuously through the shell 2 and then enter the water-containing gap 3. The structure of the shell 2 is described in detail in Figures 7-9 .

[0068] The shell 2 is provided on the periphery of the probe body 1 and is made of a waterproof, moisture-permeable and insulating material, so that the shell 2 allows the water in the water body to be measured to enter the water level probe in a discontinuous form (for example, in the form of discontinuous water droplets or water molecules) and then enter the water-containing gap 3 formed between the resistance element 11 and the conductive element 12. Since the water levels inside and outside the shell 2 are always consistent, the water level in the water-containing gap 3 will change in real time with the change of the measured water level, so that the effective length of the resistance element 11 connected to the circuit changes. After the resistance element 11 and the conductive element 12 are connected to the power supply to form an electric circuit, the effective resistance of the sliding rheostat structure constituted by the resistance element 11, the conductive element 12 and the water in the water-containing gap 3 will change with the change of the water level, thereby causing the current in the electric circuit to change. By monitoring and recording the change of the current, the change of the resistance value is obtained, and the effective length of the resistance element 11 connected to the electric circuit is inversely deduced, the change of the water level is calculated, and the purpose of continuously monitoring the water level is achieved. Moreover, since the shell 2 is made of a waterproof, moisture-permeable and insulating material, the water in the water level probe (inside the shell 2) and the water outside the water level probe (outside the shell 2) do not form a continuous path, and the entire water body does not become electrified, thereby improving the safety of the measurement.

[0069] The water level probe and the external water body constitute a communicating vessel. According to Pascal's law, in the same kind of liquid in the communicating vessel, the pressure at each point of the same depth is equal. In the case of liquid static, the liquid on the same horizontal plane inside and outside the water level probe (inside and outside the shell 2) is subjected to equal pressure, so the liquid surface will maintain the same height, that is, the water level in the water level probe is consistent with the external water level. Therefore, the change of the water level in 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 material), L represents the length of the resistance wire, and S represents the cross-sectional area of the resistance wire.

[0071] For the sliding rheostat, when the sliding piece moves, the length of the resistance wire connected to the circuit changes, thereby changing the resistance value of the circuit. Assuming that the total resistance of the sliding rheostat is R 总 , and the total length is L总 The effective resistance of the circuit is R. 有效 The length of the resistance wire connected to the 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 law of resistance, R = ... 有效 / R 总 =L 有效 / L 总 L 有效 =R 有效 ·L 总 / R 总 .

[0073] R 有效 =U / I, R can be obtained by measuring the current I. 有效 Then, the length L of the resistance wire connected to the circuit can be determined. 有效 As shown in the figure, the water level and L 有效 It is inversely proportional, and the change in water level is equal to L. 有效 The change in L 有效 Changes in the current I directly reflect changes in the water level. Therefore, by monitoring the current I, continuous monitoring of water level changes can be achieved.

[0074] like Figure 12 As shown, the effective length L of the resistance wire during water level changes is given. 有效 =L1 and L 有效 =State diagrams for two cases, L2.

[0075] In some embodiments, such as Figures 4-6 As shown, the resistive element 11 includes a resistance wire, and the conductive element 12 is a tubular conductive element 12, which is sleeved around the resistance wire; the conductive element 12 has a water-passing hole 122; as shown Figure 3 As shown, the water-holding gap 3 is formed between the conductive element 12 and the resistance wire.

[0076] The tubular conductive element 12 is sleeved around the resistance wire to form the probe body 1, which has a simple structure; a water passage hole 122 is opened on the conductive element 12 to facilitate the flow of water into the water-holding gap 3.

[0077] Resistance wires are typically made of alloys with high resistivity, such as nickel-chromium alloys, constantan, and manganin. When the water level changes, the length or area of ​​contact between the water and the resistance wire changes accordingly. Because water has a certain degree of conductivity, this causes a corresponding change in the effective resistance value of the sliding rheostat containing the resistance wire. By measuring the change in effective resistance, the water level can be calculated.

[0078] In some embodiments, as shown in Figure 10 and Figure 11 The electric resistance wire is provided with an electric resistance wire outlet end 111, which is adapted to be connected to a power supply.

[0079] The electric resistance wire outlet end 111 is provided to facilitate the connection to the power supply through a wire.

[0080] In some embodiments, as shown in Figure 2 , Figure 4 and Figure 5 The electrically conductive member 12 is provided with an electrically conductive outlet end 121, which is adapted to be connected to a power supply.

[0081] The electrically conductive outlet end 121 is provided to facilitate the connection to the power supply through a wire.

[0082] In some embodiments, as shown in Figure 8 The housing 2 comprises:

[0083] a containing cavity, in which the electric resistance wire and the electrically conductive member 12 are installed;

[0084] a first wire outlet hole 21, which is in communication with the containing cavity, and the electric resistance wire outlet end 111 is led out of the first wire outlet hole 21;

[0085] a second wire outlet hole, which is in communication with the containing cavity, and the electrically conductive outlet end 121 is led out of the second wire outlet hole.

[0086] The first wire outlet hole 21 and the second wire outlet hole are provided on the housing 2 to lead out the electric resistance wire outlet end 111 and the electrically conductive outlet end 121, which are respectively connected to the positive and negative poles of the power supply to form an electric circuit.

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

[0088] The plurality of water passing through holes 122 are distributed on the wall surface of the electrically conductive member 12 to facilitate the rapid and uniform passing of water through the electrically conductive member 12 into the water containing gap 3, so as to quickly and accurately respond to the change of water level and improve 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 is a porous nano ceramic housing 2, a porous plastic housing 2 or a fabric housing 2, which has both waterproof and moisture permeable and insulating properties, realizes the continuous monitoring of the change of water level, avoids the entire water body from being electrified, and improves the measurement safety.

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

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

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

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

[0095] Fluoropolymer: such as polytetrafluoroethylene, which has very low surface energy, and the contact angle of water on its surface is very large, which can effectively achieve the hydrophobic effect. It is chemically stable and has strong corrosion resistance, and is widely used in various hydrophobic applications;

[0096] Silicon-based material: for example, silicone rubber, which can be treated on its surface, such as chemical modification or addition of hydrophobic additives, to make it have good hydrophobicity; silicon-based materials have good flexibility and high temperature resistance, and are suitable for some hydrophobic applications that require material flexibility and heat resistance;

[0097] Carbon nanomaterials: such as carbon nanotubes and graphene, which have certain hydrophobic properties, and due to their nanoscale structure, they have a large specific surface area, which can achieve good hydrophobic effect with less dosage; 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 of the shell 2.

[0099] Using the coating method, the connection reliability of the hydrophobic layer 4 and the shell 2 is high, and the manufacturing process is simple.

[0100] In some embodiments, as Figures 1-11As shown, the water level probe comprises a shell 2, a conductive part 12 (a conductive layer) and a resistance wire, and the inner side of the shell 2 is provided with a hydrophobic coating. The shell 2 adopts a porous nanoceramic shell 2. The porous nanoceramic shell 2 wraps the conductive part 12 (layer) and the resistance wire inside the probe, and the porous structure inside the shell 2 allows water molecules to pass through. The hydrophobic layer 4 prevents the water in the water level probe from forming a continuous path with the water outside the water level probe by utilizing its hydrophobicity, thereby preventing the entire water body from being electrified. The conductive layer functions in the scheme to form a circuit loop with the water in the water level probe and the resistance wire, and is arranged at the inner wall of the porous nanoceramic shell 2. The resistance wire functions to form a sliding rheostat with the water in the water level probe and the conductive layer, and the change of the water level affects the change of the current passing through, so as to measure the water level. The water level probe can continuously measure the change of the water level, and can also ensure that the entire water body is not electrified, thereby effectively reducing the safety hazard.

[0101] According to the embodiments of the utility model, on the other hand, a kind of measuring device is further provided, comprising:

[0102] Power supply;

[0103] Water level probe, the resistance piece 11 and the conductive part 12 are connected respectively the positive pole and the negative pole of the power supply.

[0104] Since the measuring device comprises the water level probe of the utility model, it has the same technical effects as the water level probe, which will not be repeated here.

[0105] According to the embodiments of the utility model, on the other hand, a kind of electric appliance is further provided, comprising:

[0106] Water tank;

[0107] Water level probe or 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 electric appliance, and the water level probe can continuously monitor the change of water level in the water tank, and the water body in the water tank is not electrified as a whole during the measurement, thereby improving the electrical safety of the electric appliance, without affecting the normal operation of the electric appliance, and facilitating the controller to respond and issue action instruction in time according to the change of water level.

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

[0110] First, the conductive part 12 is inserted into the porous nanoceramic shell 2, and then the resistance wire is inserted into the conductive layer, and the whole water level probe is vertically inserted into the water tank. Water molecules or water droplets can pass through the gap of the porous nanoceramic shell 2 into the inside of the water level probe, and the whole water level probe and the water in the water level probe constitute a sliding rheostat. Since the inner side of the porous nanoceramic shell 2 has a hydrophobic layer 4, the water in 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 is not charged. When the water level changes, the resistance of the resistance wire changes due to the change of the water level, so the current changes, thereby measuring the specific value of the change of the water level.

[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 of the whole water tank, or can be inserted to a specified depth to monitor the change of the water level at the specified depth. Of course, in either case, the end of the water level probe connected to the lead wire needs to be arranged outside the liquid surface, and the whole water level probe cannot be completely immersed in the water body.

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

[0113] The water level probe of the utility model is used in the electrical appliances such as steam ovens, humidifiers and water dispensers, realizes continuous monitoring of the water level of the water tank, avoids charging of the whole water body, effectively improves the safety of reliable operation of the electrical appliance and improves the user satisfaction.

[0114] In addition, the water level probe of the utility model can also be used in electrical appliances such as water heaters, dishwashers, washing machines and steam generators which need to measure the water level of the water tank, realizes continuous monitoring of the water level, avoids charging of the whole water body and improves the electrical safety.

[0115] The resistance wire, the conductive part 12 and the water in the water level probe of the utility model constitute a sliding rheostat structure. The resistance value of the resistance wire is changed by the change of the water level, thereby continuously detecting the water level. Meanwhile, the probe body 1 is wrapped with a layer of porous nanoceramic on the outer side, and a layer of hydrophobic coating is coated on the inner side of the porous nanoceramic. Such arrangement can ensure the passing of water molecules and prevent the water inside and outside the water level probe from forming a continuous path to cause the water body outside the probe to be charged.

[0116] Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the present application.

Claims

1. A water level probe, characterized by, The water level probe comprises: a probe body (1) comprising a resistance element (11) and a conductive element (12), a water-containing gap (3) being formed between the resistance element (11) and the conductive element (12); the resistance element (11), the conductive element (12) and water in the water-containing gap (3) can constitute a sliding rheostat structure; a shell (2) sleeved on the periphery of the probe body (1); the shell (2) is made of a waterproof and moisture-permeable and insulating material; water to be measured is adapted to enter the water level probe discontinuously through the shell (2) and then enter the water-containing gap (3).

2. The water level probe of claim 1, wherein, The resistance element (11) comprises a resistance wire, the conductive element (12) is a tubular conductive element (12), the conductive element (12) is sleeved on the periphery of the resistance wire; the conductive element (12) is provided with a water passing through hole (122); the water-containing gap (3) is formed between the conductive element (12) and the resistance wire.

3. The water level probe of claim 2, wherein, The resistance wire is provided with a resistance wire outlet end (111) adapted to be connected to a power supply.

4. The water level probe of claim 3, wherein, The conductive element (12) is provided with a conductive wire outlet end (121) adapted to be connected to a power supply.

5. The water level probe of claim 4, wherein, The shell (2) comprises: a containing cavity, the resistance wire and the conductive element (12) being installed in the containing cavity; a first wire outlet hole (21) communicating with the containing cavity, the resistance wire outlet end (111) being led out from the first wire outlet hole (21); a second wire outlet hole communicating with the containing cavity, the conductive wire outlet end (121) being led out from the second wire outlet hole.

6. The water level probe of claim 2, wherein, A plurality of water passing through holes (122) are distributed on the conductive element (12).

7. The water level probe of claim 1, wherein, The shell (2) is a porous nanoceramic 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, An inner wall of the shell (2) is provided with a hydrophobic layer (4).

9. The water level probe of claim 8, wherein, The hydrophobic layer (4) is coated on the inner wall surface of the shell (2).

10. A measuring device, characterized by The water level probe comprises: a power supply; the resistance element (11) and the conductive element (12) of the water level probe according to any one of claims 1 to 9 are respectively connected to the positive and negative poles of the power supply.

11. An electrical appliance characterized by The water level probe comprises: a 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 appliance of claim 11, wherein, The electric appliance is a steam oven, a humidifier or a water dispenser.

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