Electrode type water immersion switch

Abstract

The utility model belongs to the technical field of water immersion switches, and in particular to an electrode-type water immersion switch, comprising a circuit board and a shell, wherein an anti-corrosion component is arranged inside the shell, and the anti-corrosion component comprises an upper limit electrode, a common electrode and a lower limit electrode. The electrode-type water immersion switch, by arranging the anti-corrosion component, realizes the use of the capacitors connected in series between the upper limit electrode, the common electrode and the lower limit electrode, and forms an RC oscillation in cooperation with the peripheral circuit of the circuit board, thereby realizing isolation from DC interference. At the same time, by means of the RC oscillation method, ionization corrosion of the electrode caused by DC resistance measurement is avoided, and the switch has the advantages of simple structural design, low cost, and can be widely used in upper and lower limit liquid level detection and control in the field of household appliances.

Description

Technical Field

[0001] The utility model relates to the technical field of water immersion switches, in particular to an electrode type water immersion switch. Background Art

[0002] A water immersion switch is an electrical switch device used to monitor water levels. When the water level reaches or exceeds the preset water level, the water immersion switch will be triggered and control the start or stop or alarm of related equipment through electrical signals. This switch is usually used to prevent water from damaging equipment, such as in the field of home appliances.

[0003] However, in the application of existing water immersion switches in the field of household appliances, the electrodes are easily corroded due to long-term immersion in water and the lack of anti-corrosion measures for the electrodes, resulting in performance degradation or even damage. Utility Model Content

[0004] The purpose of the utility model is to provide an electrode type water immersion switch to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electrode type water immersion switch, comprising a circuit board and a shell, wherein an anti-corrosion component is arranged inside the shell, and the anti-corrosion component comprises an upper limit electrode, a common electrode and a lower limit electrode, wherein the upper limit electrode, the common electrode and the lower limit electrode are all connected in series with the capacitor of the circuit board, and cooperate with the peripheral circuit of the circuit board to form an RC oscillation, and through the RC oscillation, the ionization of the upper limit electrode, the common electrode and the lower limit electrode is realized to realize the anti-corrosion action.

[0006] Preferably, the detection ends of the upper limit electrode, the common electrode and the lower limit electrode all penetrate the lower surface of the shell and extend to the bottom of the shell, the upper limit electrode is located in front of the common electrode and the lower limit electrode, and the lower limit electrode is located on the left side of the common electrode.

[0007] Preferably, the outer surfaces of the upper limit electrode, the common electrode and the lower limit electrode located below the shell are coated with an anti-corrosion coating. The material of the anti-corrosion coating is a titanium coating. Titanium has good corrosion resistance and can resist the erosion of many chemical substances. Therefore, it can effectively protect the electrodes from corrosion. At the same time, due to the strong corrosion resistance of the titanium coating, the reliability of the electrodes in harsh environments will also be improved. A cavity is opened inside the shell.

[0008] Preferably, transformer oil is provided inside the cavity, and heat dissipation fins distributed in a rectangular array are fixedly mounted on the front and back sides of the shell.

[0009] Preferably, a wire is connected above the circuit board, and a cover plate is fixedly mounted on the upper surface of the circuit board.

[0010] Preferably, the outer surface of the wire passes through the cover plate and then extends to the upper surface of the cover plate, and the upper surface of the cover plate and the upper surface of the shell are located on the same horizontal plane.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the electrode-type water immersion switch, by setting an anti-corrosion component, realizes the use of the capacitors connected in series between the upper limit electrode, the common electrode and the lower limit electrode, and cooperates with the peripheral circuit of the circuit board to form an RC oscillation, thereby realizing isolation of DC interference. At the same time, through the RC oscillation method, the ionization corrosion of the electrode caused by DC resistance measurement is avoided. It has the advantages of simple structural design, low cost, and can be widely used in upper and lower limit liquid level detection and control in the field of household appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a three-dimensional diagram of the cavity structure of an electrode-type water immersion switch proposed by the utility model;

[0014] Figure 3 This is a three-dimensional diagram of the circuit board structure of an electrode type water immersion switch proposed by the utility model.

[0015] In the figure: 1, circuit board; 2, housing; 3, upper limit electrode; 31, lower limit electrode; 32, common electrode; 33, anti-corrosion coating; 34, cavity; 35, heat dissipation fins; 36, wires; 37, cover plate. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-Figure 3 The utility model provides a technical solution: an electrode type water immersion switch, including a circuit board 1 and a shell 2, an anti-corrosion component is arranged inside the shell 2, and the anti-corrosion component includes an upper limit electrode 3, a common electrode 32 and a lower limit electrode 31, the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 are all connected in series with the capacitor of the circuit board 1, and cooperate with the peripheral circuit of the circuit board 1 to form an RC oscillation, and through the RC oscillation, the ionization of the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 is realized to realize the anti-corrosion action.

[0018] Furthermore, the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 are all made of metal materials, such as any one of stainless steel electrodes, platinum electrodes, gold electrodes, carbon electrodes, copper electrodes and silver electrodes. The upper and lower limit detection of the liquid level can be realized by the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 made of metal materials, and converted into a switch signal output.

[0019] The detection ends of the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 all penetrate the lower surface of the shell 2 and extend to the bottom of the shell 2. The upper limit electrode 3 is located in front of the common electrode 32 and the lower limit electrode 31, and the lower limit electrode 31 is located on the left side of the common electrode 32. The outer surfaces of the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31 located under the shell 2 are coated with an anti-corrosion coating 33. The material of the anti-corrosion coating 33 is titanium coating. Titanium has good corrosion resistance and can resist the erosion of many chemical substances. Therefore, it can effectively protect the electrodes from corrosion. At the same time, due to the strong corrosion resistance of the titanium coating, the reliability of the electrode in harsh environments will also be improved. A cavity 34 is opened inside the shell 2, and transformer oil is arranged inside the cavity 34. Heat dissipation fins 35 distributed in a rectangular array are fixedly installed on the front and back of the shell 2. A wire 36 is connected above the circuit board 1, and a cover plate 37 is fixedly installed on the upper surface of the circuit board 1. The outer surface of the wire 36 passes through the cover plate 37 and extends to the upper surface of the cover plate 37. The upper surface of the cover plate 37 and the upper surface of the shell 2 are located on the same horizontal plane.

[0020] The electrode-type water immersion switch, by setting an anti-corrosion component, utilizes the capacitor connected in series between the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31, and cooperates with the peripheral circuit of the circuit board 1 to form an RC oscillation to achieve isolation from DC interference. At the same time, through the RC oscillation method, ionization corrosion of the electrode caused by DC resistance measurement is avoided. It has the advantages of simple structural design, low cost, and can be widely used in upper and lower limit liquid level detection and control in the field of household appliances.

[0021] Working principle: Utilizing the conductive property of water, when the lower limit electrode 31 and the common electrode 32 are not in contact with water, they exhibit high resistance and the circuit is in an open circuit state. When water connects the lower limit electrode 31 and the common electrode 32, the conductivity of the water closes the circuit, causing the resistance to change. This change is achieved through the capacitor connected in series between the upper limit electrode 3, the common electrode 32 and the lower limit electrode 31, and in conjunction with the peripheral circuit of the circuit board 1 to form an RC oscillation. By detecting the oscillation frequency, the resistance value between the electrodes can be calculated. When the resistance value is lower than a certain threshold, it is determined that water is present and an alarm is triggered.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrode type water immersion switch, comprising a circuit board (1) and a housing (2), characterized in that: An anti-corrosion component is arranged inside the housing (2), and the anti-corrosion component comprises an upper limit electrode (3), a common electrode (32) and a lower limit electrode (31). The upper limit electrode (3), the common electrode (32) and the lower limit electrode (31) are all connected in series with the capacitor of the circuit board (1), and cooperate with the peripheral circuit of the circuit board (1) to form an RC oscillation, so as to realize an anti-corrosion action by ionizing the upper limit electrode (3), the common electrode (32) and the lower limit electrode (31).

2. The electrode type water immersion switch according to claim 1, characterized in that: The detection ends of the upper limit electrode (3), the common electrode (32) and the lower limit electrode (31) all penetrate the lower surface of the shell (2) and extend to the bottom of the shell (2); the upper limit electrode (3) is located in front of the common electrode (32) and the lower limit electrode (31); and the lower limit electrode (31) is located on the left side of the common electrode (32).

3. The electrode type water immersion switch according to claim 1, characterized in that: The outer surfaces of the upper limit electrode (3), the common electrode (32) and the lower limit electrode (31) located below the shell (2) are all coated with an anti-corrosion coating (33), and a cavity (34) is provided inside the shell (2).

4. The electrode type water immersion switch according to claim 3, characterized in that: Transformer oil is provided inside the cavity (34), and heat dissipation fins (35) distributed in a rectangular array are fixedly mounted on the front and back sides of the housing (2).

5. The electrode type water immersion switch according to claim 1, characterized in that: A wire (36) is connected above the circuit board (1), and a cover plate (37) is fixedly mounted on the upper surface of the circuit board (1).

6. The electrode type water immersion switch according to claim 5, characterized in that: Place The outer surface of the wire (36) passes through the cover plate (37) and then extends to the upper surface of the cover plate (37). The upper surface of the cover plate (37) and the upper surface of the outer shell (2) are located on the same horizontal plane.

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