Intelligent liquid detector, manufacturing method and liquid leakage detection method

Abstract

The invention discloses an intelligent liquid detector, a manufacturing method and a liquid leakage detection method, and belongs to the technical field of liquid detection. The detector is integrally packaged and comprises a photoelectric liquid detection unit, a temperature detection unit and a conductivity detection unit. The photoelectric liquid detection unit consists of a light emitting tube, a light receiving tube and a light guide cover, the temperature detection unit adopts a platinum-rhodium-platinum thermocouple, and the conductivity detection unit multiplexes a platinum electrode and a conductivity electrode of the thermocouple. Through cooperative work of multiple sensors, the detector not only can judge liquid leakage, but also can detect the temperature and conductivity parameters of leaked liquid, and further identifies the type of the liquid. Particularly, the liquid leakage rate can be calculated in real time by analyzing the time difference between a photoelectric signal and a conductivity signal and electrode position information and combining a single chip microcomputer processing technology. The device is suitable for leakage monitoring of marine power equipment such as a ship power cabin and the like, and the functions of leakage warning, leakage rate and liquid type comprehensive detection are achieved.

Description

Technical Field

[0001] The present invention relates to an intelligent liquid detector, a manufacturing method and a liquid leakage detection method, belonging to the technical field of liquid detection. Background Art

[0002] In view of the problem of liquid leakage detection in each cabin during the entire service life cycle of ocean transportation ships, which may encounter accidents such as external attacks, reef collisions, impacts, groundings, aging and corrosion, liquid detectors need to be installed in each cabin, especially in the power cabin. Currently, the liquid detectors used in ocean ships include photoelectric liquid detectors, electrode liquid detectors, and capacitive liquid detectors. Each detector has a single function and cannot determine whether the leaked or infiltrated liquid is seawater, engine fuel, or coolant, nor can it synchronously detect the leakage or infiltration rate of the liquid.

[0003] Therefore, there is an urgent need for a liquid detector that can comprehensively identify the type of liquid, monitor the liquid leakage rate, and achieve multi-sensor integration and intelligent judgment to meet the actual engineering needs of ocean ships for safety monitoring. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent liquid detector, a manufacturing method and a liquid leakage detection method to realize the detection of the type and leakage rate of the leaked liquid.

[0005] The technical solution of the present invention:

[0006] An intelligent liquid detector includes a light emitting tube, a light receiving tube, a light guide cover, a platinum-rhodium / platinum thermocouple junction, an epitaxial electrode, a platinum-rhodium lead, a first platinum lead, a first conductivity electrode, a second conductivity electrode, a second platinum lead, a signal conditioning circuit, a single-chip microcomputer, and an epitaxial platinum-rhodium electrode;

[0007] Among them, the light emitting tube, the light receiving tube, and the light guide cover form a photoelectric liquid detection unit;

[0008] The platinum-rhodium / platinum thermocouple junction, the platinum-rhodium lead, and the first platinum lead form a temperature detection unit;

[0009] The first conductivity electrode, the second conductivity electrode, and the second platinum lead form a conductivity detection unit;

[0010] The light guide cover is an elliptical hemisphere structure, and the light emitting tube and the light receiving tube are respectively placed at the two foci of the elliptical hemisphere structure;

[0011] The platinum-rhodium / platinum thermocouple junction is connected to the platinum-rhodium lead and the first platinum lead. The platinum-rhodium / platinum thermocouple junction is arranged on the surface of the light guide cover, and the platinum-rhodium lead and the first platinum lead are arranged inside the light guide cover;

[0012] The platinum-rhodium / platinum thermocouple junction extends outward to form an epitaxial platinum electrode and an epitaxial platinum-rhodium electrode, which constitute the first conductivity electrode. The first conductivity electrode and the second conductivity electrode form a symmetric structure, are placed on the surface of the light guide cover, and are parallel to the elliptical hemispherical surface. The second conductivity electrode is connected to the second platinum lead, and the second platinum lead is arranged inside the light guide cover;

[0013] The photoelectric liquid detection unit, the temperature detection unit, and the conductivity detection unit are all electrically connected to the signal conditioning circuit, and the signal conditioning circuit is electrically connected to the single-chip microcomputer.

[0014] The first conductivity electrode has an arc of 60-90 degrees and a diameter of 0.04-0.06 mm.

[0015] The second conductivity electrode is a thin platinum wire with a diameter of 0.04-0.06 mm and has an arc of 60-90 degrees.

[0016] A manufacturing method of an intelligent liquid detector includes the following steps:

[0017] S1: Form a light guide cover with an elliptical hemispherical structure by an injection molding process. Using an elliptical hemisphere mold, inject black or dark blue light-transmitting resin into it, and place the light-emitting tube and the light-receiving tube at two focal positions of the elliptical hemispherical structure, and cure and form together with the resin to complete the manufacture of the photoelectric liquid detection unit;

[0018] S2: The platinum-rhodium / platinum thermocouple junction is manufactured by a laser melting process. Cross-stack thin platinum-rhodium and thin platinum wires with a diameter of 0.04-0.06 mm, and use a laser beam to sinter and melt the platinum-rhodium / platinum wire intersection to form a thermocouple junction to complete the manufacture of the temperature-measuring thermocouple;

[0019] S3: The platinum-rhodium leads and the first platinum lead of the temperature-measuring thermocouple leave the elliptical hemisphere mold wall, and are placed inside the light guide cover and insulated from the outside after forming to complete the manufacture of the temperature detection unit;

[0020] S4: The platinum-rhodium / platinum thermocouple junction extends platinum-rhodium wire and platinum wire outward to form an epitaxial platinum electrode and an epitaxial platinum-rhodium electrode, and is shaped into an arc of 60-90 degrees through an elliptical mold as the first conductivity electrode of the conductivity detection unit. While making the light guide cover, place it in the elliptical hemisphere mold, and closely attach the platinum-rhodium / platinum thermocouple junction and the epitaxial platinum electrode and epitaxial platinum-rhodium electrode extending outward with an arc of 60-90 degrees to the elliptical hemisphere mold wall so as to be exposed after forming:

[0021] S5: The second conductivity electrode is made of platinum wire with a diameter of 0.04 - 0.06 mm by laser welding, and is formed into an arc of 60 - 90 degrees through an elliptical mold. While manufacturing the light guide cover, it is placed in an elliptical hemisphere mold, and the second conductivity electrode is closely attached to the wall of the elliptical hemisphere mold so that it is exposed after forming. The second platinum lead wire leaves the wall of the elliptical hemisphere mold and is placed inside the light guide cover and insulated from the outside after forming. The second conductivity electrode is parallel to the circular plane of the elliptical hemisphere and forms a symmetrical structure with the first conductivity electrode, completing the manufacture of the conductivity detection unit;

[0022] S6: Connect the manufactured optoelectronic liquid detection unit, temperature detection unit, and conductivity detection unit to the signal conditioning circuit and the single-chip microcomputer to complete the manufacture of the intelligent liquid detector.

[0023] A liquid leakage detection method includes:

[0024] The signal conditioning circuit and the single-chip microcomputer form a multi-sensor unit detection signal intelligent analysis system;

[0025] Judge whether there is liquid according to the signal of the optoelectronic liquid detection unit;

[0026] Detect the temperature of the liquid that appears according to the signal of the temperature detection unit;

[0027] Judge the characteristics of the liquid according to the signal of the conductivity detection unit;

[0028] Detect the rising and falling rate of the leaked liquid according to the signals of the optoelectronic liquid detection unit and the conductivity detection unit.

[0029] The working modes of the temperature detection unit and the conductivity detection unit adopt an intermittent working method. Specifically, first, use the platinum-rhodium / platinum thermocouple junction of the temperature-measuring thermocouple to detect the temperature signal, and then use the 2-electrode conductivity sensor composed of the first conductivity electrode and the second conductivity electrode to detect the liquid conductivity information, so as to judge the liquid characteristics.

[0030] The method for detecting the rising and falling rate of the leaked liquid includes: according to the time difference Δt between the signals of the optoelectronic liquid detection unit and the conductivity detection unit, and the position of the conductivity detection unit in the light guide cover, that is, the vertical distance h from the vertex of the elliptical hemisphere of the light guide cover, use the built-in program of the single-chip microcomputer to calculate the rising and falling rate v of the leaked liquid. The calculation formula is: v = h / Δt.

[0031] The present invention has the following beneficial effects:

[0032] Realize multi-parameter measurement of liquid leakage, liquid temperature, liquid conductivity, etc., and intelligent detection of whether there is liquid leakage, the type of leaked liquid, and the leakage rate, etc. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of an intelligent liquid detector;

[0034] Figure 2 It is a schematic structural diagram of a temperature detection unit and a conductivity detection unit;

[0035] Figure 3 It is a schematic diagram of the detection principle of the lifting rate of the leaked liquid;

[0036] In the figure, 1 - light emitting tube, 2 - light receiving tube, 3 - light guide cover, 4 - platinum rhodium - platinum thermocouple junction, 5 - epitaxial platinum electrode, 6 - platinum rhodium lead wire, 7 - first platinum lead wire, 8 - second conductivity electrode, 9 - second platinum lead wire, 10 - signal conditioning circuit, 11 - single - chip microcomputer, 12 - epitaxial platinum rhodium electrode. Specific implementation manners

[0037] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and do not limit the scope of the present invention.

[0038] Embodiment 1:

[0039] An intelligent liquid detector mentioned in the present invention includes a light emitting tube 1, a light receiving tube 2, a light guide cover 3, a platinum rhodium - platinum thermocouple junction 4, an epitaxial electrode 5, a platinum rhodium lead wire 6, a first platinum lead wire 7, a second conductivity electrode 8, a second platinum lead wire 9, a signal conditioning circuit 10, a single - chip microcomputer 11, and an epitaxial platinum rhodium electrode 12;

[0040] Among them, the light emitting tube 1, the light receiving tube 2, and the light guide cover 3 form an optoelectronic liquid detection unit;

[0041] The platinum rhodium - platinum thermocouple junction 4, the platinum rhodium lead wire 6, and the first platinum lead wire 7 form a temperature detection unit;

[0042] The first conductivity electrode, the second conductivity electrode 8, and the second platinum lead wire 9 form a conductivity detection unit;

[0043] The light guide cover 3 is of an elliptical hemisphere structure, and the light emitting tube 1 and the light receiving tube 2 are respectively placed at two foci of the elliptical hemisphere structure;

[0044] The platinum rhodium - platinum thermocouple junction 4 is connected to the platinum rhodium lead wire 6 and the first platinum lead wire 7, the platinum rhodium - platinum thermocouple junction 4 is arranged on the surface of the light guide cover 3, and the platinum rhodium lead wire 6 and the first platinum lead wire 7 are arranged inside the light guide cover 3;

[0045] The platinum-rhodium / platinum thermocouple junction 4 extends outwards to form an epitaxial platinum electrode 5 and an epitaxial platinum-rhodium electrode 12, which constitute a first conductivity electrode. The first conductivity electrode and the second conductivity electrode 8 form a symmetric structure, and are placed on the surface of the light guide cover 3 and are parallel to the elliptical hemisphere. The second conductivity electrode 8 is connected to a second platinum lead 9, and the second platinum lead 9 is arranged inside the light guide cover 3;

[0046] The photoelectric liquid detection unit, the temperature detection unit, and the conductivity detection unit are all electrically connected to the signal conditioning circuit 10, and the signal conditioning circuit 10 is electrically connected to the single-chip microcomputer 11.

[0047] The first conductivity electrode has a 60-degree arc and a diameter of 0.04 mm.

[0048] The second conductivity electrode 8 is a thin platinum wire with a diameter of 0.04 mm and has a 60-degree arc.

[0049] A manufacturing method of an intelligent liquid detector includes the following steps:

[0050] S1: Form the light guide cover 3 with an elliptical hemisphere structure by an injection molding process. Using an elliptical hemisphere mold, inject black or dark blue light-transmitting resin into it, and place the light-emitting tube 1 and the light-receiving tube 2 at two focal positions of the elliptical hemisphere structure, and cure and form together with the resin to complete the manufacture of the photoelectric liquid detection unit;

[0051] S2: The platinum-rhodium / platinum thermocouple junction 4 is manufactured by a laser melting process. Stack fine platinum-rhodium and fine platinum wires with a diameter of 0.04 mm crosswise, and use a laser beam to sinter and melt the cross point of the platinum-rhodium / platinum wires to form a thermocouple junction to complete the manufacture of the temperature-measuring thermocouple;

[0052] S3: The platinum-rhodium leads 6 and the first platinum lead 7 of the temperature-measuring thermocouple leave the wall of the elliptical hemisphere mold, and are placed inside the light guide cover 3 and insulated from the outside after forming to complete the manufacture of the temperature detection unit;

[0053] S4: The platinum-rhodium / platinum thermocouple junction 4 extends platinum-rhodium wire and platinum wire outwards to form an epitaxial platinum electrode 5 and an epitaxial platinum-rhodium electrode 12, and is shaped into a 60-degree arc through an elliptical mold as the first conductivity electrode of the conductivity detection unit. While manufacturing the light guide cover 3, place it in the elliptical hemisphere mold, and closely attach the platinum-rhodium / platinum thermocouple junction 4 and the epitaxial platinum electrode 5 and epitaxial platinum-rhodium electrode 12 extending outwards with a 60-degree arc to the wall of the elliptical hemisphere mold so as to be exposed after forming:

[0054] S5: The second conductivity electrode 8 is made of a platinum wire with a diameter of 0.04 mm by laser welding, and is formed into a 60-degree arc through an elliptical mold. While manufacturing the light guide cover 3, it is placed in an elliptical hemispherical mold, and the second conductivity electrode (8) is closely attached to the wall of the elliptical hemispherical mold so as to be exposed after molding. The second platinum lead 9 leaves the wall of the elliptical hemispherical mold and is placed inside the light guide cover 3 to be insulated from the outside after molding. The second conductivity electrode 8 is parallel to the elliptical hemispherical plane and forms a symmetric structure with the first conductivity electrode, completing the manufacture of the conductivity detection unit;

[0055] S6: Connect the manufactured photoelectric liquid detection unit, temperature detection unit and conductivity detection unit to the signal conditioning circuit 10 and the single-chip microcomputer 11 to complete the manufacture of the intelligent liquid detector.

[0056] A liquid leakage detection method includes:

[0057] 1. The signal conditioning circuit and the single-chip microcomputer form a multi-sensitive unit detection signal intelligent analysis system. According to the signal of the photoelectric liquid detection unit, it is judged whether there is liquid; according to the signal of the temperature detection unit, it is judged whether there is liquid and the temperature of the liquid that appears; according to the signal of the conductivity detection unit, the characteristics of the liquid are judged. For example, high-conductivity liquids may be seawater or acid-base salt solutions, etc., medium-high conductivity liquids may be tap water or fresh water or coolant, etc., and low-conductivity liquids may be liquids such as fuel oil and lubricating oil. Once the engineering application environment is determined and the possible liquid types are determined, it is possible to accurately judge what kind of liquid is detected. For example: The liquid detector applied to the engine compartment of a ship may have 3 kinds of liquids. One is fuel oil, the second is coolant, and the third is leaked seawater. The characteristics of these 3 kinds of liquids are as follows:

[0058]

[0059] Through the characteristic parameter ranges of the liquids in the above table, and through the detected liquid temperature value and conductivity value, it is very easy to judge what kind of substance the detected liquid is.

[0060] 2. The working mode of the temperature detection unit and the conductivity detection unit adopts an intermittent working method. Specifically, first, the platinum-rhodium - platinum thermocouple junction 4 of the temperature-measuring thermocouple is used to detect the temperature signal, and then the 2-electrode conductivity sensor composed of the first conductivity electrode and the second conductivity electrode 8 is used to detect the liquid conductivity information.

[0061] 3. As shown in Figure 3 For the leakage liquid rising and falling rate detection method, according to the time difference Δt between the signal of the photoelectric liquid detection unit and the signal of the conductivity detection unit, and according to the position of the conductivity detection unit in the light guide cover 3, that is, the vertical distance h from the elliptical hemispherical vertex of the light guide cover 3, the single-chip microcomputer 11 uses the built-in program to calculate the leakage liquid rising and falling rate v. The calculation formula is:

[0062] v = h / Δt

[0063] Example 2:

[0064] An intelligent liquid detector mentioned in the present invention includes a light emitting tube 1, a light receiving tube 2, a light guide cover 3, a platinum-rhodium / platinum thermocouple junction 4, an epitaxial electrode 5, a platinum-rhodium lead 6, a first platinum lead 7, a second conductivity electrode 8, a second platinum lead 9, a signal conditioning circuit 10, a single-chip microcomputer 11, and an epitaxial platinum-rhodium electrode 12;

[0065] Among them, the light emitting tube 1, the light receiving tube 2, and the light guide cover 3 form an optoelectronic liquid detection unit;

[0066] The platinum-rhodium / platinum thermocouple junction 4, the platinum-rhodium lead 6, and the first platinum lead 7 form a temperature detection unit;

[0067] The first conductivity electrode, the second conductivity electrode 8, and the second platinum lead 9 form a conductivity detection unit;

[0068] The light guide cover 3 has an elliptical hemispherical structure, and the light emitting tube 1 and the light receiving tube 2 are respectively placed at two foci of the elliptical hemispherical structure;

[0069] The platinum-rhodium / platinum thermocouple junction 4 is connected to the platinum-rhodium lead 6 and the first platinum lead 7. The platinum-rhodium / platinum thermocouple junction 4 is arranged on the surface of the light guide cover 3, and the platinum-rhodium lead 6 and the first platinum lead 7 are arranged inside the light guide cover 3;

[0070] The platinum-rhodium / platinum thermocouple junction 4 extends outwards to form an epitaxial platinum electrode 5 and an epitaxial platinum-rhodium electrode 12 to constitute the first conductivity electrode. The first conductivity electrode and the second conductivity electrode 8 form a symmetric structure, are arranged on the surface of the light guide cover 3, and are parallel to the elliptical hemispherical surface. The second conductivity electrode 8 is connected to the second platinum lead 9, and the second platinum lead 9 is arranged inside the light guide cover 3;

[0071] The optoelectronic liquid detection unit, the temperature detection unit, and the conductivity detection unit are all electrically connected to the signal conditioning circuit 10, and the signal conditioning circuit 10 is electrically connected to the single-chip microcomputer 11.

[0072] The first conductivity electrode has a 90-degree arc and a diameter of 0.06 mm.

[0073] The second conductivity electrode 8 is a thin platinum wire with a diameter of 0.06 mm and has a 90-degree arc.

[0074] A manufacturing method of an intelligent liquid detector includes the following steps:

[0075] S1: Form a light guide cover 3 with an elliptical hemispherical structure by injection molding. Using an elliptical hemisphere mold, inject black or dark blue light-transmitting resin into it, and place the light-emitting tube 1 and the light-receiving tube 2 at the two focal positions of the elliptical hemispherical structure, and cure and form together with the resin to complete the manufacturing of the optoelectronic liquid detection unit;

[0076] S2: The platinum-rhodium - platinum thermocouple junction 4 is manufactured by a laser melting process. Cross-stack thin platinum-rhodium and thin platinum wires with a diameter of 0.06 mm, and use a laser beam to sinter and melt the platinum-rhodium - platinum wire crossing points to form a thermocouple junction to complete the manufacturing of the temperature-measuring thermocouple;

[0077] S3: The platinum-rhodium leads 6 and the first platinum lead 7 of the temperature-measuring thermocouple leave the elliptical hemisphere mold wall, and are placed inside the light guide cover 3 and insulated from the outside after forming to complete the manufacturing of the temperature detection unit;

[0078] S4: The platinum-rhodium - platinum thermocouple junction 4 extends platinum-rhodium wire and platinum wire outwards to form an extended platinum electrode 5 and an extended platinum-rhodium electrode 12, and is formed into a 90-degree arc through an elliptical mold, serving as the first conductivity electrode of the conductivity detection unit. While manufacturing the light guide cover 3, place it in the elliptical hemisphere mold, and closely attach the platinum-rhodium - platinum thermocouple junction 4 and the extended platinum electrode 5 and the extended platinum-rhodium electrode 12 extending 90 degrees outwards to the elliptical hemisphere mold wall so as to be exposed after forming:

[0079] S5: The second conductivity electrode 8 is formed by laser welding of platinum wires with a diameter of 0.06 mm, and is formed into a 60-degree arc through an elliptical mold. While manufacturing the light guide cover 3, place it in the elliptical hemisphere mold, and closely attach the second conductivity electrode (8) to the elliptical hemisphere mold wall so as to be exposed after forming. The second platinum lead 9 leaves the elliptical hemisphere mold wall and is placed inside the light guide cover 3 and insulated from the outside after forming. The second conductivity electrode 8 is parallel to the elliptical hemisphere circular plane and forms a symmetrical structure with the first conductivity electrode to complete the manufacturing of the conductivity detection unit;

[0080] S6: Connect the manufactured optoelectronic liquid detection unit, temperature detection unit and conductivity detection unit to the signal conditioning circuit 10 and the single-chip microcomputer 11 to complete the manufacturing of the intelligent liquid detector.

[0081] A liquid leakage detection method includes:

[0082] 1. A multi-sensor unit detection signal intelligent analysis system is composed of a signal conditioning circuit and a single-chip microcomputer. According to the signals of the optoelectronic liquid detection unit, it judges whether there is liquid. According to the signals of the temperature detection unit, it judges whether there is liquid and the temperature of the liquid that appears. According to the signals of the conductivity detection unit, it judges the characteristics of the liquid. For example, high-conductivity liquids may be seawater or acid-base-salt solutions, etc., medium-high-conductivity liquids may be tap water or fresh water or coolant, etc., and low-conductivity liquids may be fuels, lubricants, etc. Once the engineering application environment is determined and the possible liquid types are determined, it is possible to accurately judge what kind of liquid is detected. For example, for a liquid detector applied to the ship's galley cabin, there may be three types of liquids: one is cooking oil, the second is fresh water, and the third is seawater that may leak. The characteristics of these three types of liquids are as follows:

[0083]

[0084] Through the characteristic parameter ranges of the liquids in the above table and the detected liquid temperature value and conductivity value, it is very easy to judge what kind of substance the detected liquid is.

[0085] 2. The temperature detection unit and the conductivity detection unit adopt an intermittent working method. Specifically, first, the platinum-rhodium-platinum thermocouple junction 4 of the temperature-measuring thermocouple is used to detect the temperature signal, and then the 2-electrode conductivity sensor composed of the first conductivity electrode and the second conductivity electrode 8 is used to detect the liquid conductivity information.

[0086] 3. Refer to Figure 3 As shown, for the detection method of the leakage liquid lifting rate, according to the time difference Δt between the signals of the optoelectronic liquid detection unit and the conductivity detection unit, and according to the position of the conductivity detection unit in the light guide cover 3, that is, the vertical distance h from the elliptical hemisphere vertex of the light guide cover 3, the leakage liquid lifting rate v is calculated using the built-in program of the single-chip microcomputer 11. The calculation formula is:

[0087] v = h / Δt

[0088] Matters not covered by this invention are well-known technologies.

[0089] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent liquid detector, characterized in that, It includes a light-emitting tube (1), a light-receiving tube (2), a light guide cover (3), a platinum-rhodium / platinum thermocouple junction (4), an epitaxial electrode (5), a platinum-rhodium lead (6), a first platinum lead (7), a second conductivity electrode (8), a second platinum lead (9), a signal conditioning circuit (10), a single-chip microcomputer (11), and an epitaxial platinum-rhodium electrode (12); Among them, the light-emitting tube (1), the light-receiving tube (2), and the light guide cover (3) form an optoelectronic liquid detection unit; The platinum-rhodium / platinum thermocouple junction (4), the platinum-rhodium lead (6), and the first platinum lead (7) form a temperature detection unit; The first conductivity electrode, the second conductivity electrode (8), and the second platinum lead (9) form a conductivity detection unit; The light guide cover (3) is of an elliptical hemisphere structure, and the light-emitting tube (1) and the light-receiving tube (2) are respectively placed at two focal points of the elliptical hemisphere structure; The platinum-rhodium / platinum thermocouple junction (4) is connected to the platinum-rhodium lead (6) and the first platinum lead (7). The platinum-rhodium / platinum thermocouple junction (4) is arranged on the surface of the light guide cover (3), and the platinum-rhodium lead (6) and the first platinum lead (7) are arranged inside the light guide cover (3); The platinum-rhodium / platinum thermocouple junction (4) extends outwards to form an epitaxial platinum electrode (5) and an epitaxial platinum-rhodium electrode (12) to constitute the first conductivity electrode. The first conductivity electrode and the second conductivity electrode (8) form a symmetric structure, are arranged on the surface of the light guide cover (3), and are parallel to the elliptical hemisphere surface. The second conductivity electrode (8) is connected to the second platinum lead (9), and the second platinum lead (9) is arranged inside the light guide cover (3); The optoelectronic liquid detection unit, the temperature detection unit, and the conductivity detection unit are all electrically connected to the signal conditioning circuit (10), and the signal conditioning circuit (10) is electrically connected to the single-chip microcomputer (11).

2. The intelligent liquid detector according to claim 1, wherein The first conductivity electrode has an arc of 60 to 90 degrees and a diameter of 0.04 to 0.06 mm.

3. The intelligent liquid detector according to claim 1, characterized in that, The second conductivity electrode (8) is a fine platinum wire with a diameter of 0.04 to 0.06 mm and has an arc of 60 to 90 degrees.

4. A manufacturing method of an intelligent liquid detector, characterized in that, For manufacturing the intelligent liquid detector as described in any one of claims 1 to 3, the manufacturing method includes the following steps: S1: Form the light guide cover (3) of an elliptical hemisphere structure by an injection molding process. Using an elliptical hemisphere mold, inject black or dark blue light-transmitting resin into it, and place the light-emitting tube (1) and the light-receiving tube (2) at two focal positions of the elliptical hemisphere structure, and cure and form together with the resin to complete the manufacturing of the optoelectronic liquid detection unit; S2: The platinum-rhodium / platinum thermocouple junction 4 is manufactured by a laser melting process. Stack fine platinum-rhodium and fine platinum wires with a diameter of 0.04 to 0.06 mm crosswise, and use a laser beam to sinter the platinum-rhodium / platinum wire cross points to melt and form a thermocouple junction to complete the manufacturing of the temperature-measuring thermocouple; S3: The platinum-rhodium lead (6) and the first platinum lead (7) of the temperature-measuring thermocouple leave the elliptical hemisphere mold wall, and are placed inside the light guide cover (3) to be insulated from the outside after forming to complete the manufacturing of the temperature detection unit; S4: The platinum-rhodium / platinum thermocouple junction (4) extends the platinum-rhodium wire and platinum wire outwards to form the extended platinum electrode (5) and the extended platinum-rhodium electrode (12), which are formed into an arc of 60-90 degrees through an elliptical mold and serve as the first conductivity electrode of the conductivity detection unit. While manufacturing the light guide cover (3), it is placed in an elliptical hemisphere mold, and the platinum-rhodium / platinum thermocouple junction (4) and the extended platinum electrode (5) and the extended platinum-rhodium electrode (12) extending outwards are closely attached to the wall of the elliptical hemisphere mold so as to be exposed after molding; S5: The second conductivity electrode (8) is formed by laser welding platinum wires with a diameter of 0.04-0.06 mm, and is formed into an arc of 60-90 degrees through an elliptical mold. While manufacturing the light guide cover (3), it is placed in an elliptical hemisphere mold, and the second conductivity electrode (8) is closely attached to the wall of the elliptical hemisphere mold so as to be exposed after molding. The second platinum lead (9) leaves the wall of the elliptical hemisphere mold and is placed inside the light guide cover (3) and insulated from the outside after molding. The second conductivity electrode (8) is parallel to the circular plane of the elliptical hemisphere and forms a symmetric structure with the first conductivity electrode, completing the manufacture of the conductivity detection unit; S6: Connect the manufactured photoelectric liquid detection unit, temperature detection unit, and conductivity detection unit to the signal conditioning circuit (10) and the single-chip microcomputer (11) to complete the manufacture of the intelligent liquid detector.

5. A liquid leakage detection method, characterized in that, Completed based on the intelligent liquid detector described in any one of claims 1-3, the detection method includes: The signal conditioning circuit (10) and the single-chip microcomputer (11) form a multi-sensor unit detection signal intelligent analysis system; Judge whether there is liquid according to the signal of the photoelectric liquid detection unit; Detect the temperature of the liquid that appears according to the signal of the temperature detection unit; Judge the characteristics of the liquid according to the signal of the conductivity detection unit; Detect the rising and falling rate of the leaking liquid according to the signals of the photoelectric liquid detection unit and the conductivity detection unit.

6. The liquid leakage detection method according to claim 5, characterized in that, The working modes of the temperature detection unit and the conductivity detection unit adopt an intermittent working method. Specifically, first use the platinum-rhodium / platinum thermocouple junction (4) of the temperature-measuring thermocouple to detect the temperature signal, and then use the 2-electrode conductivity sensor composed of the first conductivity electrode and the second conductivity electrode (8) to detect the liquid conductivity information, thereby judging the characteristics of the liquid.

7. The liquid leakage detection method according to claim 5, wherein The method for detecting the rising and falling rate of the leaking liquid includes: according to the time difference Δt between the signals of the photoelectric liquid detection unit and the conductivity detection unit, and the position of the conductivity detection unit in the light guide cover (3), that is, the vertical distance h from the vertex of the elliptical hemisphere of the light guide cover (3), use the built-in program of the single-chip microcomputer (11) to calculate the rising and falling rate v of the leaking liquid, and the calculation formula is: v = h / Δt.

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