An electric leakage alarm circuit assembly and its pipeline mechanism

Abstract

This invention relates to the technical field of leakage current alarms, and proposes a leakage current alarm circuit assembly and its piping structure. The leakage current alarm circuit assembly includes a leakage current signal acquisition circuit, a drive circuit, and an alarm circuit. The leakage current signal acquisition circuit is used to acquire leakage current signals from the leakage detection target. The drive circuit is used to turn the alarm circuit on and off. The leakage current signal acquisition circuit and the alarm circuit are electrically connected to the drive circuit. When the leakage current signal acquisition circuit acquires a leakage current signal, it triggers the drive circuit to turn on the alarm circuit, and the alarm circuit is in a conducting state, realizing the leakage current alarm function. When the leakage current signal acquisition circuit does not acquire a leakage current signal, the drive circuit does not turn on the alarm circuit, and the alarm circuit is in a disconnected state. In this solution, the leakage current alarm circuit directly measures whether there is leakage at one end of the pipe joint, without detecting the other end. When leakage occurs at one end of the pipe joint, the other end of the pipe joint will not be energized through the leakage current alarm circuit assembly, thus improving safety.

Description

Technical Field

[0001] This invention relates to the technical field of leakage current alarm, specifically to a leakage current alarm circuit assembly and its piping structure. Background Technology

[0002] Existing insulated connectors with integrated leakage current detection functions require the detection circuit to be laid across the metal components at both ends of the connector to construct an electrical circuit for detecting the energized state of the pipeline. This traditional detection method has inherent technical defects: the conduction of the detection circuit depends on the grounding of the non-energized end; if the grounding condition is not met, an effective circuit cannot be formed, directly causing the pipeline energization warning function to fail; at the same time, a weak induced current will be generated at the non-energized end, which not only weakens the insulation protection performance of the pipeline but also poses a safety hazard. Summary of the Invention

[0003] This invention proposes a leakage current alarm circuit assembly and its piping structure. The leakage current alarm circuit assembly, through the cooperation of the leakage current signal acquisition circuit, the drive circuit and the alarm circuit, only requires the signal sampling end of the leakage current signal acquisition circuit to be matched with one detection end of the leakage current detection target.

[0004] A leakage current alarm circuit assembly designed for this purpose includes a leakage current signal acquisition circuit, a drive circuit, and an alarm circuit. The leakage current signal acquisition circuit is used to acquire leakage current signals on the leakage current detection target; The driving circuit is used to turn the alarm circuit on and off. The leakage current signal acquisition circuit and the alarm circuit are electrically connected to the driving circuit. When the leakage current signal acquisition circuit acquires a leakage current signal, it triggers the driving circuit to turn on the alarm circuit, and the alarm circuit is in the on state to realize the leakage current alarm function. When the leakage current signal acquisition circuit does not acquire a leakage current signal, the driving circuit does not turn on the alarm circuit, and the alarm circuit is in the off state.

[0005] The output terminals of the leakage current signal acquisition circuit and the alarm circuit are electrically connected to the drive circuit, respectively. The alarm circuit and the drive circuit form a closed loop when connected.

[0006] The signal sampling terminal of the leakage current signal acquisition circuit has only one detection contact. The leakage current signal acquisition circuit is electrically connected to the detection terminal of the leakage current detection target through the detection contact of the signal sampling terminal. The non-detection terminal of the leakage current detection target is not electrically connected to the signal sampling terminal of the leakage current signal acquisition circuit. Alternatively, the signal sampling terminal of the leakage current signal acquisition circuit is in non-conductive contact with the leakage current detection target, and the signal sampling terminal of the leakage current signal acquisition circuit extends into the leakage current detection target. The signal sampling terminal of the leakage current signal acquisition circuit is used to detect whether leakage current has occurred inside the leakage current detection target.

[0007] The alarm circuit includes a power supply and an alarm element. The power supply is electrically connected to the alarm element and supplies power to the alarm element. After the alarm circuit is turned on by the drive circuit, the alarm element outputs a light signal and / or a sound signal to realize the leakage current alarm.

[0008] The alarm element is one or a combination of two of the following: a light or a buzzer.

[0009] The leakage current signal acquisition circuit includes a signal sampling terminal, and a current limiting element for limiting the current of the acquired leakage current signal is provided between the signal sampling terminal and the driving circuit. The signal sampling terminal and the driving circuit are respectively electrically connected to the current limiting element. The current-limiting element is a resistor R1.

[0010] The driving circuit includes a first switching element, one end of which is electrically connected to a current limiting element. The leakage signal from the leakage signal acquisition circuit flows through the current limiting element and then through the first switching element to turn on the first switching element. The first switching element is a transistor Q1. The driving circuit also includes a leakage discharge protection element. The base of transistor Q1 serves as the input terminal of the driving circuit and is electrically connected to the current limiting element of the leakage signal acquisition circuit. In the leakage state, the leakage signal after being limited by the current limiting element provides a conduction current to the base of transistor Q1, so that transistor Q1 is turned on. One end of the leakage current discharge protection element is electrically connected to the base of transistor Q1, and the other end is grounded; The leakage current discharge protection element is a resistor R2; The driving circuit also includes a second switching element, one end of which is electrically connected to the collector of transistor Q1. When transistor Q1 is turned on, the second switching element is triggered to turn on.

[0011] The second switching element is transistor Q2, the base of transistor Q2 is directly electrically connected to the collector of transistor Q1; the collector of transistor Q2 is electrically connected to the alarm circuit, and the emitter of transistor Q2 is grounded.

[0012] The alarm circuit also includes a current-limiting protection element; The positive terminal of the power supply is connected to the collector of transistor Q2 in the drive circuit through a current limiting protection element and an alarm element in sequence, while the negative terminal of the power supply is grounded. The current limiting protection element is used to limit the operating current of the alarm element to prevent overcurrent damage. After the drive circuit is turned on, the alarm element forms a closed current loop with the power supply, the current limiting protection element and the grounding terminal. The alarm element outputs a leakage current alarm through light signal and / or sound signal. The current limiting protection element is resistor R3.

[0013] A pipeline structure includes the aforementioned leakage current alarm circuit assembly, which is disposed on the pipeline structure. The pipeline structure has a detection position, and the signal sampling terminal of the leakage current alarm circuit assembly is disposed on the detection position of the pipeline structure. The pipeline structure is a pipe and / or a pipe joint.

[0014] The beneficial technical effects of the present invention are as follows: 1. The leakage current alarm circuit assembly of the present invention, through the cooperation of the leakage current signal acquisition circuit, the driving circuit and the alarm circuit, only requires the signal sampling end of the leakage current signal acquisition circuit to be matched with one detection end of the leakage current detection target.

[0015] 2. The signal sampling end of the leakage current alarm circuit assembly of the present invention is electrically connected to the detection end of the pipe joint. When leakage current occurs at the detection end of the pipe joint, the non-detection end of the pipe joint will not be energized through the leakage current alarm circuit assembly, thereby improving safety.

[0016] 3. This invention discloses a novel leakage current detection circuit for insulating joints. This circuit only needs to collect the electrical signal of the live end (detection end) of the insulating joint to trigger the pipeline live warning function (covering three modes: sound and light composite warning, sound and light warning alone, and light warning alone).

[0017] 4. The leakage current detection circuit of this invention does not require the construction of a detection circuit based on the non-energized end (non-detection end) of the insulating joint, and can achieve zero current output at the non-energized end, fundamentally avoiding the technical drawbacks of the traditional structure and greatly improving the insulation performance and safety protection level of the pipeline. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a leakage current alarm circuit assembly with a separate lamp according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a leakage current alarm circuit assembly with a separate buzzer, according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of a leakage current alarm circuit assembly according to an embodiment of the present invention, which includes both a lamp and a buzzer.

[0021] Figure 4 This is a three-dimensional structural diagram of a pipe joint according to an embodiment of the present invention.

[0022] Figure 5 This is a three-dimensional cross-sectional structural diagram of a pipe joint according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of a leakage current alarm circuit according to an embodiment of the present invention, in which the signal sampling terminal extends into the pipe joint.

[0024] Figure 7 This is a three-dimensional structural diagram of a circuit board with a buzzer in one embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of a pipe joint mounted on a support according to an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In order to make the above-mentioned objects, features and advantages of this application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] See Figures 1-3 A leakage current alarm circuit assembly includes a leakage current signal acquisition circuit 1, a drive circuit 2 and an alarm circuit 3; The leakage current signal acquisition circuit 1 is used to acquire the leakage current signal on the leakage current detection target; The drive circuit 2 is used to turn the alarm circuit 3 on and off. The leakage signal acquisition circuit 1 and the alarm circuit 3 are electrically connected to the drive circuit 2. When the leakage signal acquisition circuit 1 acquires a leakage signal, it triggers the drive circuit 2 to turn on the alarm circuit 3, and the alarm circuit 3 is in the on state, realizing the leakage alarm function. When the leakage signal acquisition circuit 1 does not acquire a leakage signal, the drive circuit 2 does not turn on the alarm circuit 3, and the alarm circuit 3 is in the off state.

[0028] The leakage current alarm circuit assembly, through the cooperation of leakage current signal acquisition circuit 1, drive circuit 2 and alarm circuit 3, only requires the signal sampling end of the leakage current signal acquisition circuit to be matched with one detection end of the leakage current detection target.

[0029] The output terminals of the leakage current signal acquisition circuit 1 and the alarm circuit 3 are respectively electrically connected to the drive circuit 2. The alarm circuit 3 and the drive circuit 2 form a closed loop after being connected.

[0030] The signal sampling terminal of the leakage current signal acquisition circuit 1 has only one detection contact. The leakage current signal acquisition circuit 1 is electrically connected to the detection terminal of the leakage current detection target through the detection contact of the signal sampling terminal. The non-detection terminal of the leakage current detection target is not electrically connected to the signal sampling terminal of the leakage current signal acquisition circuit 1. Alternatively, the signal sampling end of the leakage current signal acquisition circuit 1 is in non-conductive contact with the leakage current detection target, and the signal sampling end of the leakage current signal acquisition circuit 1 extends into the leakage current detection target. The signal sampling end of the leakage current signal acquisition circuit 1 is used to detect whether leakage current has occurred inside the leakage current detection target.

[0031] The alarm circuit 3 includes a power supply 301 and an alarm element. The power supply 301 is electrically connected to the alarm element and supplies power to the alarm element. After the alarm circuit 3 is turned on by the drive circuit 2, the alarm element outputs a leakage current alarm through a light signal and / or a sound signal.

[0032] The leakage current alarm circuit assembly does not require two-way connection to form a loop. It only needs to electrically connect the signal sampling end of the leakage current signal acquisition circuit to one detection end of the pipe joint. When leakage occurs, a loop can be generated through the (power supply) battery. When leakage occurs at one end of the pipe joint, the other end of the pipe joint will not be energized through the leakage current alarm circuit assembly, thus improving safety.

[0033] The alarm element is either a lamp 303 or a buzzer 305, or a combination of both.

[0034] The leakage current signal acquisition circuit 1 includes a signal sampling terminal, and a current limiting element 101 for limiting the current of the acquired leakage current signal is provided between the signal sampling terminal and the driving circuit 2. The signal sampling terminal and the driving circuit 2 are respectively electrically connected to the current limiting element 101. The current limiting element 101 is a resistor R1.

[0035] A current limiting element 101 is provided between the signal sampling terminal and the input terminal of the drive circuit 2, which can effectively limit the current of the collected leakage signal, prevent excessive current from directly entering the drive circuit 2 and causing damage to the components of the drive circuit 2, ensure the stability of leakage signal acquisition and transmission, ensure that the subsequent drive circuit 2 can accurately receive the leakage signal, lay the foundation for the reliable operation of the entire leakage alarm circuit assembly, and extend the overall service life of the circuit.

[0036] The driving circuit 2 includes a first switching element 201. One end of the first switching element 201 is electrically connected to the current limiting element 101. The leakage signal of the leakage signal acquisition circuit 1 flows through the current limiting element 101 and then through the first switching element 201 to turn on the first switching element 201. The first switching element 201 is a transistor Q1. The driving circuit 2 also includes a leakage current discharge protection element 202. The base of the transistor Q1 serves as the input terminal of the driving circuit 2 and is electrically connected to the current limiting element 101 of the leakage current signal acquisition circuit 1. In the leakage state, the leakage current signal after being limited by the current limiting element 101 provides a conduction current to the base of the transistor Q1, so that the transistor Q1 is turned on. One end of the leakage current discharge protection element 202 is electrically connected to the base of the transistor Q1, and the other end is grounded; The leakage current discharge protection element 202 is a resistor R2; The driving circuit 2 further includes a second switching element 203, one end of which is electrically connected to the collector of transistor Q1. When transistor Q1 is turned on, the second switching element 203 is triggered to turn on.

[0037] The second switching element 203 is a transistor Q2. The base of transistor Q2 is directly electrically connected to the collector of transistor Q1. The collector of transistor Q2 is electrically connected to the alarm circuit 3, and the emitter of transistor Q2 is grounded.

[0038] The first switching element 201 in the drive circuit 2 is a transistor Q1, which can receive and amplify the leakage signal transmitted by the leakage signal acquisition circuit 1 and convert it into a drive level signal that is compatible with the conduction of the drive circuit 2. This solves the problem that weak leakage signals are difficult to trigger the operation of the drive circuit 2, ensuring that even low-intensity leakage signals can be accurately identified and amplified, improving the sensitivity of leakage signal detection, and enabling the leakage alarm circuit assembly to respond in time at the initial stage of leakage, thereby enhancing the timeliness and reliability of the warning.

[0039] The leakage current discharge protection element 202 has one end electrically connected to the base of transistor Q1 and the other end grounded. Transistor Q1 can conduct upon receiving a leakage current signal after current limiting at its base, exhibiting rapid conduction response and quickly transmitting the leakage current signal. The leakage current discharge protection element 202 effectively discharges the leakage current at the base of transistor Q1, preventing leakage current accumulation that could cause mis-conduction of transistor Q1. Simultaneously, it maintains a static low potential at the base, ensuring reliable cutoff of transistor Q1 when there is no leakage current signal, preventing false alarm circuit activation, and improving the accuracy and stability of the circuit operation.

[0040] The alarm circuit 3 also includes a current limiting protection element 302; The positive terminal of the power supply 301 is connected to the collector of the transistor Q2 in the drive circuit 2 via the current limiting protection element 302 and the alarm element in sequence, while the negative terminal of the power supply 301 is grounded. The current limiting protection element 302 is used to limit the operating current of the alarm element to prevent overcurrent damage. After the drive circuit 2 is turned on, the alarm element forms a closed current loop with the power supply 301, the current limiting protection element 302 and the grounding terminal. The alarm element outputs a light signal and / or sound signal to realize leakage alarm. The current limiting protection element 302 is a resistor R3.

[0041] The conduction and cutoff states of transistor Q2 strictly follow the state changes of transistor Q1. The logic relationship is clear, the operation is stable and reliable, and it can accurately control the on and off of the alarm circuit. This ensures that the alarm circuit starts in time when there is leakage and disconnects reliably when there is no leakage, thus improving the working efficiency and accuracy of the entire leakage alarm circuit assembly.

[0042] The power supply output voltage of alarm circuit 3 (301) is adapted to the operating requirements of the alarm element, ensuring its normal operation. Current limiting protection element 302 limits the operating current of the alarm element to prevent overcurrent damage and extend its lifespan. The alarm element uses a light-emitting diode or LED to output a light signal warning, which is intuitive and allows users to quickly detect leakage. The power supply 301, current limiting protection element 302, alarm element, and drive circuit 2 form a closed loop, with a reasonable structure and stable operation. The alarm is activated immediately after drive circuit 2 is turned on, providing a rapid response.

[0043] See Figure 1 , specifically: The power supply 301 is a 12V DC power supply. The positive terminal is connected to resistor R3, and the negative terminal is connected to the ground terminal of the entire circuit.

[0044] The alarm element consists of 6 red LED beads connected in series. Its anode is connected to one end of resistor R3, and its cathode is connected to the collector of transistor Q2. Alternatively, a single LED bead can be used.

[0045] Transistor Q2: Emitter grounded, base connected to collector of transistor Q1; collector connected to cathode of LED bead.

[0046] Transistor Q1: The emitter is grounded, the base is connected to the 220V AC signal SENSOR input terminal through resistor R1 and grounded through resistor R2, and the collector is connected to the base of transistor Q2.

[0047] The 220V AC detection signal (SENSOR) is connected to the base of transistor Q1 through resistor R1. Resistor R2 provides a DC ground path for the base of transistor Q1, ensuring that transistor Q1 is reliably cut off when there is no signal.

[0048] This invention discloses a novel leakage current detection circuit for insulating joints. This circuit only needs to collect the electrical signal from the energized end (detection end) of the insulating joint to trigger the pipeline energization warning function (covering three modes: combined audible and visual warning, individual audible and visual warning, and individual visual warning). This leakage current detection circuit eliminates the need to construct a detection circuit based on the non-energized end (non-detection end) of the insulating joint, achieving zero current output at the non-energized end. This fundamentally avoids the technical drawbacks of traditional structures and significantly improves the pipeline insulation performance and safety protection level.

[0049] The working principle of this technical solution: When there is no detection signal, and there is no 220V AC signal input at the SENSOR terminal, the base of transistor Q1 is grounded through resistor R2, the potential is 0V, and transistor Q1 is in the cutoff state (open state).

[0050] At this time, no current is injected into the base of transistor Q2, and transistor Q2 is also in the cutoff state (open state). No current flows through the LED lamp bead branch, and the LED lamp bead does not light up.

[0051] When a detection signal is present, when a 220V AC signal is input to the SENSOR terminal, the signal is current-limited through resistor R1, and provides bias current to the base of transistor Q1 during the positive half-cycle, causing transistor Q1 to conduct.

[0052] After transistor Q1 is turned on, its collector potential is pulled low, and current flows to the base of transistor Q2, causing Q2 to turn on. The current flows out from the positive terminal of the 12V power supply, through resistor R3, the LED series group, the collector and emitter of transistor Q2, and finally to ground, lighting up the LED and indicating the presence of a 220V AC signal.

[0053] The functions of the corresponding electrical components: Transistor Q1: As the first stage of signal amplification / detection, it converts weak AC signals into DC level changes.

[0054] Transistor Q2: As the second-stage power driver, it provides sufficient conduction current for the LED beads.

[0055] Resistor R3: Provides current limiting for the LED beads to prevent damage from overcurrent.

[0056] Resistor R2: Ensures that transistor Q1 is reliably cut off when there is no signal, avoiding false triggering.

[0057] See Figures 4-8 A pipeline structure includes the aforementioned leakage current alarm circuit assembly, the leakage current alarm circuit assembly is disposed on the pipeline structure, the pipeline structure has a detection position, the signal sampling terminal of the leakage current alarm circuit assembly is disposed on the detection position of the pipeline structure, and the pipeline structure is a pipe and / or a pipe joint.

[0058] The pipe can be connected to the signal sampling terminal of the leakage current signal acquisition circuit 1. For example, if the pipe is metal, the signal sampling terminal of the leakage current signal acquisition circuit 1 is connected to the outside of the metal pipe through a wire. If the pipe is made of insulating material, the signal sampling terminal of the leakage current signal acquisition circuit 1 extends into the pipe.

[0059] The pipe joint material is an insulating material. The signal sampling end of the leakage current signal acquisition circuit 1 extends into the pipe joint. When the pipe joint material is an insulating material, but the pipe joint has metal thread heads at both ends, the signal sampling end of the acquisition circuit 1 is electrically connected to the metal thread heads. When the pipe joint is made entirely of metal material, the signal sampling end of the acquisition circuit 1 is connected to the outside of the pipe joint through a wire.

[0060] The pipe joint is a gas pipe joint. The pipe joint has two ends, one as the detection end and the other as the non-detection end. In this solution, the leakage current alarm circuit assembly is only used to detect whether one end of the pipe joint (i.e., the detection end) is leaking current. The other end (i.e., the non-detection end) does not need to be electrically connected to the same leakage current alarm circuit assembly. That is, the other end does not need to be detected by the same leakage current alarm circuit assembly. The signal sampling end of the leakage current alarm circuit assembly is electrically connected to the detection end of the pipe joint. When a leakage occurs at the detection end of the pipe joint, the non-detection end of the pipe joint will not be energized through the leakage current alarm circuit assembly, thus improving safety.

[0061] See Figure 4 , Figure 5 A pipe joint includes a joint body 4, on which the above-mentioned leakage alarm circuit assembly is provided, and the joint body 4 is conductively connected to the signal sampling terminal of the leakage signal acquisition circuit 1.

[0062] The connector body 4 is made of insulating material, so that when one end of the connector body 4 is energized, the other end of the connector body 4 will not be energized through the connector body 4. The connector body 4 of the insulating material is provided with a first threaded connector 401 and a second threaded connector 402. Assembly cavities for fixing the threaded connectors are provided at both ends of the connector body 4. A cover 5 is provided on the outside of the connector body 4, forming an mounting cavity 7 between the cover 5 and the outside of the connector body 4 for mounting a circuit board 6. The circuit board 6 is provided with a power supply 301 and an alarm element, which are electrically connected to the circuit board 6. A light-transmitting cover 8 is provided at the light-emitting part of the alarm element. The light-transmitting cover 8 is fitted around the outer periphery of the second threaded connector 402. The light-transmitting cover 8 is made of transparent silicone and is interference-fitted around the outer periphery of the second threaded connector 402.

[0063] When one of the threaded connectors is energized, the other threaded connector will not be energized through the connector body 4 because the connector body 4 is made of insulating material.

[0064] The connector body 4 has a through hole 403 for mounting the spring 9. One end of the spring 9 abuts against the first threaded connector 401, and the other end of the spring 9 abuts against the circuit board 6 to achieve a conductive connection. The spring 9 is a metal spring.

[0065] Specifically, the first threaded connector 401 is made of metal, and the circuit board 6 is electrically connected to the first threaded connector 401 via a metal spring. This allows for the detection of whether a leakage occurs at the pipe joint.

[0066] See Figure 6 The first threaded connector 401 and the second threaded connector 402 are integrally formed with the connector body 4, and all three are made of insulating material. The signal sampling end of the leakage current signal acquisition circuit extends into the connector body 4. The signal sampling end is a leakage current detection metal probe. If the fluid is charged, the leakage current signal can be collected through the leakage current detection metal probe. The mating position between the signal sampling end and the connector body 4 is provided with a sealing structure to prevent fluid leakage, such as tap water.

[0067] See Figure 7 and Figure 8 The pipe joint is mounted on a bracket, which houses a battery-powered power supply 301. A circuit board 6 is also mounted on the pipe joint, connected to it via wires. The pipe joint is a conductor (metal), while the bracket is an insulator. The circuit board 6 contains an alarm element that emits a warning light. When a leakage occurs at the pipe joint, the current conducts to the electronic components on the circuit board 6, completing the circuit and triggering the alarm element.

[0068] The above are merely 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 within the protection scope of the present invention.

Claims

1. A leakage current alarm circuit assembly, characterized in that: It includes a leakage current signal acquisition circuit (1), a driving circuit (2), and an alarm circuit (3); The leakage signal acquisition circuit (1) is used to acquire the leakage signal on the leakage detection target; The driving circuit (2) is used to turn on and off the alarm circuit (3). The leakage signal acquisition circuit (1) and the alarm circuit (3) are electrically connected to the driving circuit (2). When the leakage signal acquisition circuit (1) acquires the leakage signal, it triggers the driving circuit (2) to turn on the alarm circuit (3). The alarm circuit (3) is in the on state, realizing the leakage alarm function. When the leakage signal acquisition circuit (1) does not acquire the leakage signal, the driving circuit (2) does not turn on the alarm circuit (3), and the alarm circuit (3) is in the off state.

2. The leakage current alarm circuit assembly according to claim 1, characterized in that: The output terminals of the leakage current signal acquisition circuit (1) and the alarm circuit (3) are electrically connected to the drive circuit (2), respectively. The alarm circuit (3) and the drive circuit (2) form a closed loop after being connected.

3. The leakage current alarm circuit assembly according to claim 1, characterized in that: The signal sampling end of the leakage current signal acquisition circuit (1) has only one detection contact. The leakage current signal acquisition circuit (1) is electrically connected to the detection end of the leakage current detection target through the detection contact of the signal sampling end. The non-detection end of the leakage current detection target is not electrically connected to the signal sampling end of the leakage current signal acquisition circuit (1). Alternatively, the signal sampling end of the leakage signal acquisition circuit (1) is in non-conductive contact with the leakage detection target, and the signal sampling end of the leakage signal acquisition circuit (1) extends into the leakage detection target. The signal sampling end of the leakage signal acquisition circuit (1) is used to detect whether leakage occurs inside the leakage detection target.

4. The leakage current alarm circuit assembly according to claim 1, characterized in that: The alarm circuit (3) includes a power supply (301) and an alarm element. The power supply (301) is electrically connected to the alarm element and supplies power to the alarm element. After the alarm circuit (3) is turned on by the drive circuit (2), the alarm element outputs a light signal and / or a sound signal to realize the leakage alarm.

5. The leakage current alarm circuit assembly according to claim 4, characterized in that: The alarm element is one or a combination of two of the following: a lamp (303) or a buzzer (305).

6. The leakage current alarm circuit assembly according to claim 1, characterized in that: The leakage current signal acquisition circuit (1) includes a signal sampling terminal. A current limiting element (101) for limiting the current of the acquired leakage current signal is provided between the signal sampling terminal and the driving circuit (2). The signal sampling terminal and the driving circuit (2) are electrically connected to the current limiting element (101). The current limiting element (101) is a resistor R1.

7. The leakage current alarm circuit assembly according to claim 1, characterized in that: The driving circuit (2) includes a first switching element (201), one end of which is electrically connected to a current limiting element (101). The leakage signal of the leakage signal acquisition circuit (1) flows through the current limiting element (101) and then through the first switching element (201) to make the first switching element (201) conduct. The first switching element (201) is a transistor Q1. The driving circuit (2) also includes a leakage discharge protection element (202). The base of the transistor Q1 serves as the input terminal of the driving circuit (2) and is electrically connected to the current limiting element (101) of the leakage signal acquisition circuit (1). Under leakage conditions, the leakage signal after being limited by the current limiting element (101) provides a conduction current to the base of the transistor Q1, so that the transistor Q1 is turned on. One end of the leakage current discharge protection element (202) is electrically connected to the base of the transistor Q1, and the other end is grounded; The leakage current discharge protection element (202) is a resistor R2; The driving circuit (2) further includes a second switching element (203), one end of which is electrically connected to the collector of transistor Q1. When transistor Q1 is turned on, the second switching element (203) is triggered to turn on.

8. The leakage current alarm circuit assembly according to claim 7, characterized in that: The second switching element (203) is transistor Q2. The base of transistor Q2 is directly electrically connected to the collector of transistor Q1. The collector of transistor Q2 is electrically connected to the alarm circuit (3). The emitter of transistor Q2 is grounded.

9. The leakage current alarm circuit assembly according to claim 4, characterized in that: The alarm circuit (3) also includes a current limiting protection element (302); The positive terminal of the power supply (301) is connected to the collector of the transistor Q2 of the drive circuit (2) in sequence through the current limiting protection element (302) and the alarm element, while the negative terminal of the power supply (301) is grounded. The current limiting protection element (302) is used to limit the working current of the alarm element to avoid overcurrent damage. After the drive circuit (2) is turned on, the alarm element forms a closed current loop with the power supply (301), the current limiting protection element (302) and the grounding terminal. The alarm element outputs a leakage alarm through light signal and / or sound signal. The current limiting protection element (302) is a resistor R3.

10. A pipeline mechanism, characterized in that: The invention includes the leakage current alarm circuit assembly as described in any one of claims 1-9, wherein the leakage current alarm circuit assembly is disposed on a pipeline structure, the pipeline structure is provided with a detection position, the signal sampling terminal of the leakage current alarm circuit assembly is disposed on the detection position of the pipeline structure, and the pipeline structure is a pipe and / or a pipe joint.

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