Liquid leakage detection device and method

Abstract

The present invention provides a liquid leakage detection device and method, comprising a four-core sensing line, a signal generating circuit, a signal control circuit, a signal acquisition circuit and a microcontroller, wherein the signal control circuit and the signal acquisition circuit are both connected to the microprocessor, the signal generating circuit is used to output an excitation signal to the signal control circuit, the signal acquisition circuit is used to acquire a signal to be tested returned by the four-core sensing line, and the microprocessor is used to calculate and determine whether the sensing line is broken according to a signal provided by the received signal acquisition circuit, if the sensing line is not broken, the excitation signal is controlled in a normal mode to be injected into the four-core sensing line through a first injection path and calculate whether there is liquid leakage and the position of the liquid leakage; if the sensing line is broken, the excitation signal is controlled in a sensing line break mode to be injected into the four-core sensing line through a second injection path and calculate whether there is liquid leakage and the position of the leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid leakage detection, and in particular to a liquid leakage detection device and method. Background Art

[0002] The computer room of a big data center has many sophisticated equipment and has strict requirements on the environment. If water leaks in the computer room, it may cause major losses if it is not handled in time. The early warning of liquid leakage is detected by the leakage controller to detect the electrical signal on the leakage sensing line, and then determine whether there is a liquid leak after calculation. A four-core sensing line is required to detect the specific location of the leak. The four-core sensing line contains four sensing lines, which are named A, B, C, and D for convenience of explanation; A and C are two insulated wires, and B and D are sensing lines with surface impedance. A and B are a group with short-circuited tail ends; C and D are a group with short-circuited tail ends. Existing detection methods, such as Figure 1 As shown, the excitation signal ① is injected by A, and D is connected to the reference resistor R to the power ground. When the liquid leaks, the signal flows from B to D to the ground, and the detection C can detect the leakage and the leakage position. However, when one or more signal lines are broken due to the external environment, the signal loop is blocked and the liquid leakage cannot be detected, resulting in accidents and losses. Summary of the invention

[0003] In view of this, the present invention provides a device and method capable of detecting whether a sensing line is broken and still being able to perform liquid leakage detection when the sensing line is broken.

[0004] An embodiment of the present invention provides a liquid leakage detection device, including four-core sensing wires, a signal generating circuit, a signal control circuit, a signal acquisition circuit and a microcontroller, wherein the signal control circuit and the signal acquisition circuit are both connected to the microprocessor, the signal generating circuit is used to output an excitation signal to the signal control circuit, the signal acquisition circuit is used to acquire a test signal returned by the four-core sensing wires, and the microprocessor is used to calculate and determine whether the sensing wires are broken according to the signals provided by the received signal acquisition circuit, if the sensing wires are not broken, the excitation signal is controlled in a normal mode to be injected into the four-core sensing wires through a first injection path and calculate whether there is liquid leakage and the position of the liquid leakage; if the sensing wires are broken, the excitation signal is controlled in a sensing wire break mode to be injected into the four-core sensing wires through a second injection path and calculate whether there is liquid leakage and the position of the leakage.

[0005] Specifically, the four-core induction wire includes a first induction wire, a second induction wire, a third induction wire and a fourth induction wire, the first induction wire and the third induction wire are insulated induction wires, the second induction wire and the fourth induction wire are wires with surface resistance, the first induction wire and the second induction wire are a group, the first ends of the first induction wire and the second induction wire are respectively connected to the signal control circuit, and the second ends of the first induction wire and the second induction wire are short-circuited; the third induction wire and the fourth induction wire are a group, the first ends of the third induction wire and the fourth induction wire are respectively connected to the signal control circuit, and the second ends of the third induction wire and the fourth induction wire are short-circuited.

[0006] Specifically, the signal control circuit includes a switch array, the switch array includes a plurality of switches, and combinations of different switch states correspond to different excitation signal injection paths.

[0007] Specifically, the switch array includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch, the signal control circuit includes an excitation signal input terminal connected to the signal generating circuit, the first switch is connected between the excitation signal input terminal and the first end of the first sensing line; one end of the second switch is connected to the second sensing line, and the other end is grounded through a resistor; the third switch is connected to the first end of the first sensing line and the second sensing line, and is connected to the first switch and the second switch; the fourth switch is connected between the excitation signal input terminal and the first end of the third sensing line; one end of the fifth switch is connected to the fourth sensing line, and the other end is grounded through a resistor; the sixth switch is connected to the first end of the third sensing line and the fourth sensing line, and is connected to the fourth switch and the fifth switch.

[0008] Specifically, in normal mode, the first switch and the fifth switch are closed, and the second switch, the third switch, the fourth switch and the sixth switch are opened, so that the excitation signal is injected into the four-core sensing wire through the first injection path; the microcontroller is used to calculate whether there is liquid leakage and the leakage location according to the detection signals of the second sensing wire, the third sensing wire and the fourth sensing wire.

[0009] Specifically, if one of the first and second sensing wires is broken, the first switch, the third switch, and the fifth switch are closed, and the second switch, the fourth switch, and the sixth switch are opened, so that the excitation signal is injected into the four-core sensing wire through the second injection path; the microcontroller is used to calculate whether there is liquid leakage and the leakage location according to the detection signals of the second, third, and fourth sensing wires.

[0010] Specifically, if one of the third and fourth sensing wires is broken, the second switch, the fourth switch, and the sixth switch are closed, and the first switch, the third switch, and the fifth switch are opened, so that the excitation signal is injected into the four-core sensing wires through the second injection path; the microcontroller is used to calculate whether there is liquid leakage and the leakage location according to the detection signals of the third, first, and second sensing wires.

[0011] Furthermore, the liquid leakage detection device also includes a display circuit connected to the microprocessor, and the microcontroller is used to control the display circuit to display the liquid leakage detection result.

[0012] Furthermore, the liquid leakage detection device also includes a warning circuit connected to the microprocessor, and the warning circuit is used to send out an audible and visual warning signal when liquid leakage is detected.

[0013] Furthermore, the liquid leakage detection device also includes a communication circuit connected to the microprocessor, and the communication circuit is used to send the detection information of the liquid leakage to the upper-level monitoring system.

[0014] The embodiment of the present invention further provides a liquid leakage detection method, which is applied to the above-mentioned liquid leakage detection device, and the method comprises:

[0015] The signal generating circuit outputs an excitation signal to the signal controlling circuit;

[0016] The signal control circuit controls the excitation signal to be injected into the four-core sensing wire in a normal mode;

[0017] The signal acquisition circuit acquires the signal to be tested returned by the four-core induction line;

[0018] The signal acquisition circuit converts the signal to be measured into a digital signal and provides it to the microprocessor;

[0019] The microprocessor calculates and determines whether the sensing line is broken based on the digital signal provided by the signal acquisition circuit;

[0020] If the sensing line is not broken, the presence of liquid leakage and the leakage location are calculated in normal mode;

[0021] If the sensing line is broken, the excitation signal is controlled to be injected into the four-core sensing line according to the sensing line break mode; and the signal acquisition circuit collects the test signal returned by the four-core sensing line, converts it into a digital signal after processing and provides it to the microprocessor. The microprocessor calculates whether there is liquid leakage and the leakage location according to the sensing line break mode.

[0022] Specifically, the signal control circuit changes the injection path of the excitation signal by changing the switch array, so that when there is liquid leakage, the excitation signal can still form a loop on the sensing line.

[0023] Furthermore, the microprocessor drives the display circuit to display the liquid leakage detection result after calculating whether there is liquid leakage and the leakage location.

[0024] Furthermore, after calculating the presence of liquid leakage and the leakage location, the microprocessor generates an audible and visual warning and sends the detection result to a superior monitoring host.

[0025] The embodiment of the present invention cooperates with the four-core sensing wire to detect whether there is liquid leakage and the leakage location of the liquid. It can still accurately detect liquid leakage and detect the leakage location after the leakage sensing wire is broken. Compared with the existing liquid leakage detection technology, the embodiment of the present invention can still detect liquid leakage and the specific leakage location after the sensing wire is broken, which improves the accuracy and reliability of the detection results, so as to avoid major property safety losses caused by failure to detect liquid leakage in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is an existing liquid leakage detection circuit diagram;

[0028] Figure 2 This is a circuit connection diagram of a liquid leakage detection circuit according to an embodiment of the present invention;

[0029] Figure 3 Shows Figure 2 A diagram of the switch array inside the signal control circuit;

[0030] Figure 4 The present invention is a flow chart of a liquid leakage detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The embodiment of the present invention aims to solve the problem of still detecting the liquid leakage and the specific location of the liquid leakage if liquid leakage occurs after the induction line detection loop is broken.

[0033] The technical solution provided by the embodiment of the present invention is to change the injection path of the excitation signal through the switch array when the induction line is detected to be broken, so that when the liquid leaks, the excitation signal can still form a loop on the induction line, and the leakage is determined and the leakage position is calculated by the returned signal.

[0034] like Figure 2 As shown, an embodiment of the present invention provides a liquid leakage detection device, which is composed of ① [signal generating circuit], ② [signal control circuit], ③ [signal acquisition circuit], ④ [microprocessor], ⑤ [display circuit], ⑥ [communication circuit], and ⑦ [sound and light alarm circuit]. ⑤ [display circuit], ⑥ [communication circuit], and ⑦ [sound and light alarm] circuits are connected to ④ [microprocessor]; ③ [signal acquisition circuit] is connected to ④ [microprocessor]; ② [signal control circuit] is connected to ① [signal generating circuit], and ② [signal control circuit] is connected to ④ [microprocessor].

[0035] The technical solution of the present invention cooperates with the four-core sensing wire to detect whether there is liquid leakage and the leakage location of the liquid. It can still accurately detect liquid leakage and detect the leakage location after the leakage sensing wire is broken. Compared with the existing leakage detection technology, this invention can still detect liquid leakage and the specific leakage location after the sensing wire is broken, so as to avoid major property safety losses caused by failure to detect liquid leakage in time.

[0036] The technical key points of the device implemented by the method of the present invention are mainly in ② [Signal control circuit] and ③ [Signal acquisition circuit]. Compared with the prior art, the present invention adds a switch array and its control circuit to the signal control circuit, and controls the switch array circuit to select a suitable path to inject the excitation signal into the sensing line after detecting the break of the sensing line; the existing signal acquisition circuit can only collect single-ended analog signals, while the ③ [Signal acquisition circuit] of the present invention can collect bipolar analog signals and measure the reverse signal to be measured generated after the sensing line is broken.

[0037] The embodiments of the present invention can be applied to data center computer rooms, power transformers / distribution rooms, semiconductor production workshops / equipment rooms, archives, petrochemical warehouses / transmission pipelines, nuclear power plants, military warehouses and other places where losses may be caused by leakage or intrusion of related liquids (but not limited to the above places). Once leakage of liquids such as water, oil, acids, alkalis, benzene compounds occurs in these places, if it is not handled in time, it may cause major property losses, casualties or environmental pollution.

[0038] The leakage detection controller (leakage detection system) developed by the present invention can still quickly locate the leakage position in real time (accurate to within ±0.5 meters) when the induction line loop is broken. This directly points out the direction for the investigation of leakage accidents and provides strong support for reducing losses.

[0039] When the method of the present invention detects that the sensing line is broken, the injection path of the excitation signal is changed through the switch array to cause liquid leakage so that the excitation signal can still form a loop on the sensing line, and the leakage is determined and the leakage position is calculated through the returned signal.

[0040] The device of the present invention is composed of ① [signal generating circuit], ② [signal control circuit], ③ [signal acquisition circuit], ④ [microprocessor], ⑤ [display circuit], ⑥ [communication circuit], and ⑦ [sound and light alarm circuit]. ① [signal generating circuit] generates an excitation signal; ② [signal control circuit] controls the excitation signal to be injected into the water leakage sensing line according to the mode given by the microprocessor; ③ [signal acquisition circuit] is responsible for collecting the signal to be tested returned by the sensing line, shaping the analog signal and converting the polarity of the analog signal, and converting the analog signal into a digital signal; ④ [microprocessor] is responsible for processing the collected signal, controlling ② [signal control circuit], driving ⑤ [display circuit], driving ⑥ [communication circuit], and driving ⑦ [sound and light alarm circuit]; ⑤ [display circuit] is used to display the leakage and the leakage position; ⑥ [communication circuit] sends the leakage and the leakage position to the upper monitoring system; ⑦ [sound and light alarm circuit] generates a sound alarm and drives light emission.

[0041] The workflow of the present invention is as follows: ① [signal generating circuit] generates analog excitation signal, ② [signal control circuit] controls the analog excitation signal to be tested to be injected into the four-core induction line according to the normal mode; ③ [signal acquisition circuit] collects the signal to be tested returned by the four-core induction line, and converts it into a digital signal after processing and provides it to ④ [microprocessor]; ④ [microprocessor] receives the digital signal provided by the signal acquisition circuit, and determines whether the induction line is broken through calculation, and if the induction line is not broken, calculates the leakage position according to the normal mode, drives ⑤ [display circuit] to display the position, generates an audible and visual alarm, and sends it to the upper monitoring system through ⑥ [communication circuit]; if the induction line is broken, ② [signal control circuit] controls the signal to be tested to be injected into the four-core induction line according to the induction line break mode, and ③ [signal acquisition circuit] collects the signal returned by the four-core induction line, converts it into a digital signal after processing and provides it to ④ [microprocessor], ④ [microprocessor] calculates the leakage position according to the induction line break mode, drives ⑤ [display circuit] to display the leakage position, generates an audible and visual alarm, and sends it to the upper monitoring host through ⑥ [communication circuit].

[0042] Specific reference Figure 2 and Figure 3 The four-core induction line includes four induction lines, which are named A, B, C, and D for convenience of explanation. A and C are two insulated wires, and B and D are wires with surface impedance. A and B are a group with short ends; C and D are a group with short ends.

[0043] The ② [signal control circuit] includes four ports, which are respectively connected to the first ends of the sensing lines A, B, C, and D, the second ends of the first group of sensing lines A and B are connected (short-circuited), and the second ends of the second group of sensing lines C and D are connected (short-circuited).

[0044] The ② [signal control circuit] includes a switch array, which includes a plurality of switches, and combinations of different switch states correspond to different excitation signal injection paths.

[0045] The switch array includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5 and a sixth switch K6. The ② [signal control circuit] includes an excitation signal input terminal connected to the ① [signal generating circuit]. The first switch K1 is connected between the excitation signal input terminal and the first end of the sensing line A; one end of the second switch K2 is connected to the first end of the sensing line B, and the other end is grounded through a resistor R; the third switch K3 is connected to the first ends of the sensing lines A and B, and is connected to the first switch K1 and the second switch K2; the fourth switch K4 is connected between the excitation signal input terminal and the first end of the sensing line C; one end of the fifth switch K5 is connected to the first end of the sensing line D, and the other end is grounded through a resistor R; the sixth switch K6 is connected to the first ends of the sensing lines C and D, and is connected to the fourth switch K4 and the fifth switch K5.

[0046] The ③ [signal acquisition circuit] includes four signal acquisition ports, which are respectively connected to the sensing lines A, B, C, and D, and are used to collect the signals returned by the four-core sensing lines; the ③ [signal acquisition circuit] also includes an I / O port connected to the ④ [microprocessor], which is used to process the collected signals and convert them into digital signals and output them to the ④ [microprocessor]. The ④ [microprocessor] determines whether the sensing line is broken based on the digital signals provided by the ③ [signal acquisition circuit].

[0047] Under normal circumstances where there is no break in the sensing line, switches K1 and K5 are closed, K2, K3, K4, and K6 are disconnected, and the excitation signal is injected from the sensing line A. When there is liquid leakage, the signal flows from B to D through resistor R to the ground. The signals of B, C, and D can be detected to calculate whether there is leakage and the leakage location based on Ohm's law and resistivity of the circuit.

[0048] If any sensing line is broken, ④ [the microprocessor] can know which sensing line(s) are broken, and based on the breakage of different sensing lines, control the state of the switch array so that the excitation signal can still form a loop on the sensing line, and determine the leakage and calculate the leakage position through the returned signal.

[0049] Scenario 1: When one of the sensing lines of the A and B groups is broken (for example, A), no signal flows from the B sensing line to D, and no signal is generated on the C sensing line, and the leakage position cannot be detected. At this time, K1, K3 and K5 of the present invention ② are closed, and K2, K4, and K6 are disconnected. The excitation signal is injected into A and B at the same time. When leakage occurs, the signal flows from the B sensing line to D through the resistor R to the ground, and the measured signal is generated on the B, C, and D sensing lines. The signals of B, C, and D are collected, and the leakage and the leakage position are calculated according to Ohm's law of the circuit and the resistivity of the sensing line.

[0050] Scenario 2: When one of the sensing lines of the C and D groups is broken (for example, D), the excitation signal is injected from A, and the signal on the B sensing line cannot flow to D. There is no signal to be measured on the C sensing line, and the leakage position cannot be determined. At this time, K2, K4 and K6 of the present invention ② are closed, K1, K3, K5 are disconnected, and the excitation signal is injected from C and D respectively. When a leakage occurs, the signals on C, A, and B are detected, and the leakage and the leakage position are calculated according to Ohm's law of the circuit and the resistivity of the sensing line.

[0051] Compared with the existing liquid leakage detection technology, the embodiment of the present invention can still detect liquid leakage and the specific location of the leakage after the sensing line is broken, thereby improving the accuracy and reliability of the detection results, thereby avoiding major property safety losses caused by failure to detect liquid leakage in time.

[0052] See also Figure 4 The embodiment of the present invention further provides a liquid leakage detection method, which is applied to the above-mentioned liquid leakage detection device, and the method comprises the following steps:

[0053] S1: The signal generating circuit outputs an excitation signal to the signal control circuit;

[0054] S2: The signal control circuit controls the excitation signal to be injected into the four-core sensing wire in normal mode;

[0055] S3: The signal acquisition circuit collects the signal to be tested returned by the four-core induction line;

[0056] S4: The signal acquisition circuit converts the measured signal into a digital signal and provides it to the microprocessor;

[0057] S5: The microprocessor calculates and determines whether the sensing line is broken according to the digital signal provided by the signal acquisition circuit;

[0058] S6: If the sensing line is not broken, calculate whether there is liquid leakage and the leakage location according to the normal mode;

[0059] S7: If the sensing line is broken, the excitation signal is controlled to be injected into the four-core sensing line according to the sensing line break mode; and the signal acquisition circuit collects the test signal returned by the four-core sensing line, converts it into a digital signal after processing and provides it to the microprocessor, and the microprocessor calculates whether there is liquid leakage and the leakage position according to the sensing line break mode.

[0060] If any sensing line is broken, ④ [the microprocessor] can know which sensing line(s) are broken, and based on the breakage of different sensing lines, control the state of the switch array so that the excitation signal can still form a loop on the sensing line, and determine the leakage and calculate the leakage position through the returned signal.

[0061] Scenario 1: When one of the sensing lines of the A and B groups is broken (for example, A), no signal flows from the B sensing line to D, and no signal is generated on the C sensing line, and the leakage position cannot be detected. At this time, K1, K3 and K5 of the present invention ② are closed, and K2, K4, and K6 are disconnected. The excitation signal is injected into A and B at the same time. When leakage occurs, the signal flows from the B sensing line to D through the resistor R to the ground, and the measured signal is generated on the B, C, and D sensing lines. The signals of B, C, and D are collected, and the leakage and the leakage position are calculated according to Ohm's law of the circuit and the resistivity of the sensing line.

[0062] Scenario 2: When one of the sensing lines of the C and D groups is broken (for example, D), the excitation signal is injected from A, and the signal on the B sensing line cannot flow to D. There is no signal to be measured on the C sensing line, and the leakage position cannot be determined. At this time, K2, K4 and K6 of the present invention ② are closed, K1, K3, K5 are disconnected, and the excitation signal is injected from C and D respectively. When a leakage occurs, the signals on C, A, and B are detected, and the leakage and the leakage position are calculated according to Ohm's law of the circuit and the resistivity of the sensing line.

[0063] S8: After calculating whether there is liquid leakage and the leakage position, the microprocessor drives the display circuit to display the liquid leakage detection result;

[0064] S9: After calculating the presence of liquid leakage and the leakage location, the microprocessor generates an audible and visual warning and sends the detection result to the superior monitoring host.

[0065] The signal control circuit changes the injection path of the excitation signal by changing the switch array, so that when there is liquid leakage, the excitation signal can still form a loop on the sensing line.

[0066] The above preferred embodiments are used to further explain the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. The scope of rights claimed by the present invention should be based on the scope of the invention application, and is not limited to the above embodiments.

Claims

1. A liquid leakage detection device, comprising a four-core sensing wire, a signal generating circuit, and a signal control circuit, characterized in that: The liquid leakage detection device also includes a signal acquisition circuit and a microprocessor. The signal control circuit and the signal acquisition circuit are both connected to the microprocessor. The signal generating circuit is used to output an excitation signal to the signal control circuit. The signal acquisition circuit is used to acquire the signal to be tested returned by the four-core sensing wire. The microprocessor is used to calculate and determine whether the sensing wire is broken according to the received signal provided by the signal acquisition circuit. If the sensing wire is not broken, the excitation signal is controlled to be injected into the four-core sensing wire through the first injection path according to the normal mode and calculate whether there is liquid leakage and the position of the liquid leakage; if the sensing wire is broken, the excitation signal is controlled to be injected into the four-core sensing wire through the second injection path according to the sensing wire break mode and calculate whether there is liquid leakage and the position of the leakage; The signal control circuit includes a switch array, which includes multiple switches, and combinations of different switch states correspond to different excitation signal injection paths. When a break in the sensing line is detected, the injection path of the excitation signal is changed through the switch array, so that when liquid leaks, the excitation signal can still form a loop on the sensing line, and the leakage is determined and the leakage position is calculated through the returned signal.

2. The liquid leakage detection device according to claim 1, characterized in that: The four-core induction wires include a first induction wire, a second induction wire, a third induction wire and a fourth induction wire, the first induction wire and the third induction wire are insulated induction wires, the second induction wire and the fourth induction wire are wires with surface resistance, the first induction wire and the second induction wire are a group, the first ends of the first induction wire and the second induction wire are respectively connected to the signal control circuit, and the second ends of the first induction wire and the second induction wire are short-circuited; the third induction wire and the fourth induction wire are a group, the first ends of the third induction wire and the fourth induction wire are respectively connected to the signal control circuit, and the second ends of the third induction wire and the fourth induction wire are short-circuited.

3. The liquid leakage detection device according to claim 2, characterized in that: The switch array includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch. The signal control circuit includes an excitation signal input terminal connected to the signal generating circuit. The first switch is connected between the excitation signal input terminal and the first end of the first sensing line; one end of the second switch is connected to the second sensing line, and the other end is grounded through a resistor; the third switch is connected to the first end of the first sensing line and the second sensing line, and is connected to the first switch and the second switch; the fourth switch is connected between the excitation signal input terminal and the first end of the third sensing line; one end of the fifth switch is connected to the fourth sensing line, and the other end is grounded through a resistor; the sixth switch is connected to the first end of the third sensing line and the fourth sensing line, and is connected to the fourth switch and the fifth switch.

4. The liquid leakage detection device according to claim 3, characterized in that: In normal mode, the first switch and the fifth switch are closed, and the second switch, the third switch, the fourth switch and the sixth switch are opened, so that the excitation signal is injected into the four-core sensing wire through the first injection path; the microprocessor is used to calculate whether there is liquid leakage and the leakage location according to the detection signals of the second sensing wire, the third sensing wire and the fourth sensing wire.

5. The liquid leakage detection device according to claim 4, characterized in that: If one of the first sensing wire and the second sensing wire is broken, the first switch, the third switch and the fifth switch are closed, and the second switch, the fourth switch and the sixth switch are opened, so that the excitation signal is injected into the four-core sensing wire through the second injection path; the microprocessor is used to calculate whether there is liquid leakage and the leakage position according to the detection signals of the second sensing wire, the third sensing wire and the fourth sensing wire.

6. The liquid leakage detection device according to claim 4, characterized in that: If one of the third sensing wire and the fourth sensing wire is broken, the second switch, the fourth switch and the sixth switch are closed, and the first switch, the third switch and the fifth switch are opened, so that the excitation signal is injected into the four-core sensing wire through the second injection path; the microprocessor is used to calculate whether there is liquid leakage and the leakage position according to the detection signals of the third sensing wire, the first sensing wire and the second sensing wire.

7. The liquid leakage detection device according to claim 1, characterized in that: The liquid leakage detection device also includes a display circuit connected to the microprocessor, and the microprocessor is used to control the display circuit to display the liquid leakage detection result.

8. The liquid leakage detection device according to claim 1, characterized in that: The liquid leakage detection device also includes a warning circuit connected to the microprocessor, and the warning circuit is used to emit an audible and visual warning signal when liquid leakage is detected; the liquid leakage detection device also includes a communication circuit connected to the microprocessor, and the communication circuit is used to send liquid leakage detection information to a superior monitoring system.

9. A liquid leakage detection method, applied to the liquid leakage detection device according to any one of claims 1 to 8, the method comprising: The signal generating circuit outputs an excitation signal to the signal controlling circuit; The signal control circuit controls the excitation signal to be injected into the four-core induction wire in a normal mode; The signal acquisition circuit acquires the signal to be tested returned by the four-core induction wire; The signal acquisition circuit converts the signal to be measured into a digital signal and provides it to the microprocessor; The microprocessor calculates and determines whether the sensing line is broken according to the digital signal provided by the signal acquisition circuit; If the sensing line is not broken, the presence of liquid leakage and the leakage location are calculated in normal mode; If the induction line is broken, the excitation signal is controlled to be injected into the four-core induction line according to the induction line break mode; and the signal acquisition circuit collects the test signal returned by the four-core induction line, converts it into a digital signal after processing and provides it to the microprocessor, and the microprocessor calculates whether there is liquid leakage and the leakage position according to the induction line break mode; Wherein, the signal control circuit changes the injection path of the excitation signal by changing the switch array, so that when there is liquid leakage, the excitation signal can still form a loop on the sensing line; The microprocessor drives the display circuit to display the liquid leakage detection result after calculating whether there is liquid leakage and the leakage position; After calculating the presence of liquid leakage and the leakage location, the microprocessor generates an audible and visual warning and sends the detection result to a superior monitoring host.

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