Automatic control system of intelligent safety liquid supply device for alcohol-based liquid fuel and liquid supply device

Abstract

The utility model discloses an automatic control system and liquid supply device of alcohol group liquid fuel intelligent safety liquid supply device belongs to alcohol group fuel supply technical field, and the system includes power conversion circuit, float ball control module, relay control circuit and alarm circuit. The float ball control module includes the first, second and third float ball switch of setting at different liquid level. When working normally, the second float ball switch controls the first relay, to realize the automatic start -stop of fuel delivery pump and oil supplement. The first float ball switch and third float ball switch series connection control second relay, and the normally closed contact of second relay is connected alarm circuit. When the second float ball switch failure leads to liquid level too high, or the liquid level of steel bottle is too low and leads to, all can trigger second relay action, and start alarm. The utility model discloses through the cooperation of multiple float balls and the control of double relay logic, realizes automatic oil supplement, high liquid level redundancy protection, low liquid level liquid alarm and fuel delivery pump dry pumping protection and other functions.

Description

Technical Field

[0001] This utility model relates to the field of alcohol-based fuel supply technology, specifically to the automatic control system and supply device of an intelligent safety liquid fuel supply device for alcohol-based liquid fuel. Background Technology

[0002] As an important alternative energy source, the application of alcohol-based liquid fuels is undergoing profound changes due to increasingly stringent safety standards. Traditional methods of supplying fuels using suspended plastic drums are gradually being replaced by ground-mounted, atmospheric-pressure stainless steel cylinders due to their inherent safety risks. However, while this shift improves storage safety, it also presents new technical challenges to the fuel supply control system, revealing numerous shortcomings in existing technologies for addressing these challenges.

[0003] Existing fuel supply control systems have certain shortcomings. Users typically cannot know the remaining fuel level in the cylinders in real time, often only realizing the problem passively after the fuel runs out and the stove goes out. This not only causes sudden business interruptions but also necessitates a cumbersome purging process after replacing the fuel cylinder due to air being drawn into the pipeline—a time-consuming and extremely inconvenient process resulting in a poor user experience. Furthermore, some solutions incorrectly install the level detection components on walls or the top of the cylinders, failing to meet national and local standards. The existing control logic also suffers from serious deficiencies in safety and reliability. Systems generally lack necessary safety redundancy, relying entirely on a single level control element. If this element (such as a float switch) malfunctions, such as contact sticking, the fuel delivery pump may malfunction, continuously pumping fuel until it overflows, posing a serious safety hazard. Conversely, if the element fails to close, the system will shut down directly. In these abnormal situations, the system cannot provide users with clear fault diagnosis information; users cannot determine whether it is a component failure or fuel depletion, nor can they handle the situation without interrupting business operations, significantly compromising the continuity and reliability of the equipment.

[0004] To address these issues, this invention provides an automatic control system and a liquid dispenser for an intelligent and safe alcohol-based liquid fuel dispenser. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an automatic control system and a liquid dispenser for an intelligent and safe alcohol-based liquid fuel dispenser, thus solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic control system for an intelligent and safe alcohol-based liquid fuel dispenser, comprising:

[0007] A power conversion circuit is used to convert an external 220V voltage into the 12V voltage required by the system. The power conversion circuit includes a transformer U13, a voltage regulator U11 and a power connector J25. A fuse FU and a varistor R4 are connected between the transformer U13 and the power connector J25.

[0008] An interface circuit, used to connect an external fuel delivery pump and system components, includes an eight-pin connector J24.

[0009] A float control module, which is electrically connected to an interface circuit, includes a first float switch, a second float switch, and a third float switch.

[0010] A relay control circuit is provided to cooperate with the float control module to control the working state of the entire system. The relay control circuit is electrically connected to the float control module. The relay control circuit includes a first relay U10 and a second relay U12. The first relay U10 is electrically connected to a first rectifier diode D7, and a first RC snubber circuit is provided between the first relay U10 and the first rectifier diode D7. The second relay U12 is electrically connected to a second rectifier diode D41, and a second RC snubber circuit is provided between the second relay U12 and the second rectifier diode D41. The first relay U10 is a time-delay relay.

[0011] An alarm circuit is provided for performing an alarm operation. The alarm circuit is electrically connected to the relay control circuit and includes a buzzer J65.

[0012] An indicator light circuit is provided to indicate the system's operating status. The indicator light circuit is electrically connected to the power conversion circuit and includes an LED D42.

[0013] Preferably, pin 1 of the transformer U13 is connected in series with fuse FU and then signal-connected to pin 1 of the power connector J25. Pin 2 of the transformer U13 is signal-connected to pin 2 of the power connector J25. The varistor R4 is connected in series between pins 1 and 2 of the transformer U13. Pin 3 of the transformer U13 is grounded. Pin 4 of the transformer U13 is signal-connected to pin 1 of the voltage regulator U11. Capacitors C1 and C2 are connected in parallel between pins 2 and 3 of the voltage regulator U11. Pin 3 of the voltage regulator U11 is used to output 12V voltage. The power connector J25 is used to connect to an external 220V power supply.

[0014] Preferably, pins 1 and 2 of the eight-pin connector J24 are used to connect to the power input terminal of the external fuel delivery pump, pin 3 of the eight-pin connector J24 is electrically connected to pin 3 of the voltage regulator U11, and pins 4, 5 and 7 of the eight-pin connector J24 are connected together.

[0015] Preferably, the positive terminal of the first float switch is electrically connected to pin 3 of the eight-pin connector J24, the negative terminal of the first float switch is electrically connected to pin 4 of the eight-pin connector J24, the positive terminal of the second float switch is electrically connected to pin 5 of the eight-pin connector J24, the negative terminal of the second float switch is electrically connected to pin 6 of the eight-pin connector J24, the positive terminal of the third float switch is electrically connected to pin 7 of the eight-pin connector J24, and the negative terminal of the third float switch is electrically connected to pin 8 of the eight-pin connector J24.

[0016] Preferably, pin 1 of the first relay U10 is electrically connected to pin 6 of the eight-pin connector J24, pin 2 of the first relay U10 is grounded, pin 3 of the first relay U10 is electrically connected to pin 2 of the power connector J25, pin 5 of the first relay U10 is electrically connected to pin 2 of the eight-pin connector J24, pin 1 of the first rectifier diode D7 is connected to pin 1 of the first relay U10 after being connected in series with resistor R42, pin 2 of the first rectifier diode D7 is grounded, and the first RC snubber circuit includes resistor R43 and capacitor C4, which are connected in series between pin 1 of the first relay U10 and pin 2 of the first rectifier diode D7.

[0017] Pin 1 of the second relay U12 is electrically connected to pin 8 of the eight-pin connector J24. Pins 2 and 3 of the second relay U12 are grounded. Pin 1 of the second rectifier diode D41 is electrically connected to pin 1 of the second relay U12 after being connected in series with resistor R2336. Pin 2 of the second rectifier diode D41 is grounded. The second RC snubber circuit includes resistor R44 and capacitor C3, which are connected in series between pin 1 of the second relay U12 and pin 2 of the second rectifier diode D41.

[0018] Preferably, pin 1 of the buzzer J65 is electrically connected to pin 4 of the transformer U13, and pin 2 of the buzzer J65 is electrically connected to pin 5 of the second relay U12.

[0019] Preferably, the positive terminal of the LED lamp D42 is connected to pin 4 of the transformer U13 via a series resistor R2337, and the negative terminal of the LED lamp D42 is grounded.

[0020] This utility model also includes a liquid dispenser, comprising a dispenser body, a breathing port device fixed to one side of the top wall of the dispenser body, an inlet pipe fixedly connected to the connecting pipe between the breathing port device and the dispenser body, a flame arrestor mesh and activated carbon installed inside the breathing port device, and two outlet pipes fixedly connected to the bottom of the side wall of the dispenser body, and further comprising:

[0021] The automatic control system of the intelligent safety liquid fuel dispenser for alcohol-based liquid fuels, as described above; and

[0022] An electrical box is fixed to one side of the liquid dispenser body. The automatic control system of the alcohol-based liquid fuel intelligent safety liquid dispenser is installed inside the electrical box. The first float switch, the second float switch, and the third float switch are all installed on the top wall of the liquid dispenser body, and the float installation heights of the first float switch, the second float switch, and the third float switch decrease sequentially.

[0023] Beneficial effects

[0024] This invention provides an automatic control system and a dispenser for an intelligent and safe alcohol-based liquid fuel dispenser. Compared with the prior art, it has the following advantages:

[0025] (1) The automatic control system and the dispenser of the intelligent safety dispenser for alcohol-based liquid fuel have a dual-redundancy anti-overflow protection mechanism through the coordinated operation of the first float switch and the second float switch. Under normal circumstances, the second float switch controls the automatic replenishment of fuel; once the second float switch fails and causes the liquid level to rise abnormally, the first float switch will take over the control and trigger an alarm, effectively eliminating the risk of fuel overflow caused by control failure and ensuring the safety of the place of use. At the same time, by configuring a delay function for the relay controlling the fuel delivery pump, when the system causes the fuel delivery pump to run dry for a long time due to reasons such as insufficient liquid in the cylinder, the system will automatically cut off the power supply to the fuel delivery pump after a preset safe time, effectively protecting the fuel delivery pump from damage, further improving the durability of the system and significantly reducing the user's replacement frequency and maintenance costs.

[0026] (2) The automatic control system and dispenser of this intelligent safety dispenser for alcohol-based liquid fuel achieve fully automated liquid supply management through the precise coordination of the float control module and the relay control circuit, without the need for manual intervention. In particular, by setting a low-position third float switch, it can intelligently detect whether the fuel in the cylinder is exhausted and clearly remind the user to replace the fuel with a continuous long alarm, solving the problem that the user cannot predict the remaining fuel, and avoiding the cumbersome operation of emptying the pump and pipeline after replacing the fuel cylinder due to timely replacement.

[0027] (3) The automatic control system and the liquid dispenser of the intelligent safety liquid dispenser for alcohol-based liquid fuel have high stability and anti-interference capability in their power conversion circuit. The output fluctuation is ≤ ±0.3V and the withstand voltage is up to 600V. It provides a clean and stable working power supply for the core control module and sensors, ensuring long-term reliable operation in complex power environments. The interface circuit design has high integration and strong expandability. It has reserved standard interfaces with external fuel delivery pumps, various float switches and remote monitoring modules, supporting flexible expansion and integration of system functions. It is easy to adapt to different models of combustion appliances and installation environments. The whole system has a compact structure and integrates the liquid level detection and control system directly into the miniature liquid dispenser inside the stove. It completely eliminates the illegal situation of installing electrical control components on the cylinder or wall. It fully complies with the national and local safety regulations for civilian equipment of alcohol-based liquid fuel and has significant compliance and safety advantages. Attached Figure Description

[0028] Figure 1 This is a system block diagram of this utility model;

[0029] Figure 2 This is the circuit diagram of the power conversion circuit of this utility model;

[0030] Figure 3 This is the circuit diagram of the interface circuit of this utility model;

[0031] Figure 4 This is the connection circuit diagram of the first relay in the relay control circuit of this utility model;

[0032] Figure 5 This is the connection circuit diagram of the second relay in the relay control circuit of this utility model;

[0033] Figure 6 This is the circuit diagram of the alarm circuit of this utility model;

[0034] Figure 7 This is the circuit diagram of the indicator light circuit of this utility model;

[0035] Figure 8 This is a three-dimensional structural view of the liquid supply device of this utility model.

[0036] In the diagram: 1. First float switch; 2. Second float switch; 3. Third float switch; 4. Inlet pipe; 5. Electrical box; 6. Breathing port device; 7. Outlet pipe; 8. Liquid dispenser body. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Example:

[0039] Please see Figure 1-7 The automatic control system of the intelligent safety liquid fuel dispenser for alcohol-based liquid fuel includes a power conversion circuit, an interface circuit, a float control module, a relay control circuit, an alarm circuit, and an indicator light circuit.

[0040] Power Conversion Circuit: This circuit converts the external 220V AC mains power to the safe 12V low voltage required for system operation. Specifically, the power conversion circuit includes a power connector J25 for connecting to an external 220V AC power source. Pin 1 of the power connector J25 is connected in series with pin 1 of the transformer U13 via a fuse FU. Pin 2 of the power connector J25 is directly connected to pin 2 of the transformer U13. A varistor R4 is connected in series between pins 1 and 2 of the transformer U13. The fuse FU provides protection against overload or short circuit, preventing damage to the entire circuit board. The varistor R4 clamps the voltage when the circuit experiences overvoltage (such as lightning strikes or voltage spikes), absorbing excess current to protect sensitive components. Transformer U13 steps down the input 220V AC power and transmits it from its pin 4 to the voltage regulator U11. There, capacitors C1 and C2 perform rectification, filtering, and voltage regulation, outputting a 12V DC power with fluctuations ≤ ±0.3V and a withstand voltage ≤ 600V. This power supplies the system's control components (such as relays and buzzers). Pin 3 of transformer U13 is grounded, creating a safe grounding loop.

[0041] Indicator light circuit: In this embodiment, an indicator light circuit is provided to visually indicate to the user that the system is powered on. This circuit consists of an LED D42 and a current-limiting resistor R2337 connected in series. The positive terminal of LED D42 is connected to pin 4 (12V power supply) of transformer U13 through resistor R2337, and its negative terminal is grounded. When the system is powered on, LED D42 will light up, indicating that the system is in standby mode.

[0042] Interface Circuit: This circuit provides an interface for the system to connect to external devices (fuel delivery pump, float switch). The interface circuit mainly includes an eight-pin connector J24. (The details are missing from the original text.)

[0043] Pins 1 and 2 of the eight-pin connector J24 are used to connect to the power input of an external fuel delivery pump, providing the fuel delivery pump with a 220V operating voltage.

[0044] Pin 3 of the eight-pin connector J24 is electrically connected to pin 4 of the transformer U13 to provide a 12V safe operating power supply to an external float switch.

[0045] Pins 4, 5, and 7 of the eight-pin connector J24 are interconnected on the circuit board, serving as the common terminal for the float switch signal.

[0046] Float control module: This module is the core component for sensing changes in liquid level. It includes a first float switch 1, a second float switch 2, and a third float switch 3 installed on the liquid dispenser body 8. All three use 316 stainless steel floats (diameter ≤ 28mm) and are sealed with polytetrafluoroethylene (PTFE). The float of the first float switch 1 is 10mm higher than the float of the second float switch 2, and the float of the third float switch 3 is 10mm lower than the float of the second float switch 2.

[0047] The second float switch 2 (main control float) is the switch that controls the start and stop of the fuel delivery pump during normal operation. Its positive terminal is connected to pin 5 of the eight-pin connector J24, and its negative terminal is connected to pin 6 of the eight-pin connector J24.

[0048] The first float switch 1 (high-level backup float) is a redundant protection switch used in case the second float switch fails. It is installed higher than the second float switch. Its positive terminal is connected to pin 3 of the eight-pin connector J24, and its negative terminal is connected to pin 4 of the eight-pin connector J24.

[0049] The third float switch (low-level low-liquidity float) is used to detect whether the fuel in the liquid storage container is depleted. It is installed at the lowest position. Its positive terminal is connected to pin 7 of the eight-pin connector J24, and its negative terminal is connected to pin 8 of the eight-pin connector J24. The third float switch 3 has the opposite on / off logic to the first float switch 1 and the second float switch 2, forming independent detection and complementary control for low-level low-liquidity operation.

[0050] Relay control circuit: This circuit is the core of the system's execution, controlling the operation of the fuel delivery pump and alarm based on signals from the float control module. This circuit includes a first relay U10 and a second relay U12.

[0051] The first relay U10 is used to control the start and stop of the fuel delivery pump. The control circuit of its coil (pins 1 and 2) is determined by the second float switch. Specifically, pin 1 of the first relay U10 is connected to pin 6 of the eight-pin connector J24 (i.e., the negative terminal of the second float switch), and pin 2 is grounded. Pins 3 and 5 are connected in series in the 220V power supply circuit of the fuel delivery pump: pin 3 of the first relay U10 is connected to pin 2 of the power connector J25 (220V neutral wire), and pin 5 is connected to pin 2 of the eight-pin connector J24 (fuel delivery pump control). Pin 1 of the first rectifier diode D7 is electrically connected to pin 1 of the first relay U10 after being connected in series with resistor R42. A first RC snubber circuit is also provided, consisting of resistor R43 and capacitor C4, connected in series between pin 1 of the first relay U10 and pin 2 of the first rectifier diode D7. This circuit absorbs the reverse electromotive force generated when the coil is de-energized, protecting the circuit. It is worth mentioning that the first relay U10 is a time-delay relay. By setting a preset time (e.g., 1 minute), if the liquid level fails to rise for an extended period due to reasons such as insufficient liquid in the cylinder (i.e., the second float switch 2 remains closed for an extended period), the time-delay relay will automatically disconnect after the preset time is reached, stopping the operation of the fuel delivery pump. This achieves dry-pump protection for the fuel delivery pump and extends its service life.

[0052] The second relay U12 is used to control the alarm circuit. Its coil (pins 1 and 2) control circuit is determined by the first float switch 1 and the third float switch 3 connected in series. Specifically, pin 1 of the second relay U12 is connected to pin 8 of the eight-pin connector J24 (i.e., the negative terminal of the third float switch 3), and pin 2 is grounded. Pin 1 of the second rectifier diode D41 is electrically connected to pin 1 of the second relay U12 after being connected in series with resistor R2336. A second RC snubber circuit is also provided, comprising resistor R44 and capacitor C3, which are connected in series between pin 1 of the second relay U12 and pin 2 of the second rectifier diode D41. Its function is the same as that of the first rectifier diode D7 and the first RC snubber circuit.

[0053] Alarm Circuit: This circuit is used to issue an audible alarm when the system malfunctions. The alarm circuit includes a buzzer J65. Pin 1 of buzzer J65 is connected to pin 4 of transformer U13 (12V power supply), and pin 2 is connected to pin 5 of the second relay U12, i.e., its normally closed contact. It is worth noting that buzzer J65 can also be replaced with or connected in parallel with a wireless signal transmitting module. In the event of a fault or low fluid level, the system can not only issue a local alarm but also send alarm information to the user's mobile phone or a central monitoring platform, enabling remote monitoring and management.

[0054] Working principle:

[0055] I. Normal automatic fluid replenishment working status:

[0056] When the stove continuously consumes fuel, causing the liquid level in the fuel dispenser to drop, the float of the second float switch 2 sinks, closing its internal switch. The coil of the first relay U10 is energized and its pins 3 and 5 close. 220V power is supplied to the fuel delivery pump via pin 3 of the first relay U10 and pins 1 and 2 of the eight-pin connector J24, and the fuel delivery pump begins pumping fuel. As the liquid level rises, the float of the second float switch 2 rises, opening its internal switch and cutting off the current to the coil of the first relay U10. The contacts of U10 open, and the fuel delivery pump stops working. This cycle repeats, automatically maintaining the liquid level. During this normal process, the floats of both the first float switch 1 and the third float switch 3 are in the rising state, and their internal switches are both closed. Therefore, the coil of the second relay U12 is conductive, and the second relay U12 is energized. Its normally closed contact (connected to the buzzer) is open, so the buzzer J65 does not sound.

[0057] II. Main control float fault protection (overflow redundancy mechanism):

[0058] If the second float switch malfunctions (e.g., contacts sticking and unable to disconnect), the fuel delivery pump will continue to operate, causing the liquid level to rise abnormally. When the liquid level rises to the set height of the first float switch 1, its float rises, causing its internal switch to open. The opening of the first float switch 1 cuts off the power supply circuit to the coil of the second relay U12. The second relay U12 is de-energized and releases, and its normally closed contacts reopen. At this time, the buzzer J65 sounds an alarm. As the stove continues to consume fuel, the liquid level will slowly decrease. When it drops to the reset height of the first float switch 1, its switch closes, U12 re-engages, and the buzzer stops. However, because the fuel delivery pump is still operating malfunctioning, the liquid level will rise again, triggering the alarm. This creates intermittent buzzer alarms, alerting the user that the main control float has malfunctioned and requires timely repair, while also preventing the risk of fuel spillage.

[0059] III. Low Liquid Level Alarm for Gas Cylinders:

[0060] When the fuel in the external fuel cylinder is depleted, the fuel delivery pump, although operating (controlled by the second float switch 2), cannot draw fuel, causing the liquid level in the pressure regulator box to continuously drop. When the liquid level drops to the set height of the third float switch 3, its float sinks, causing its internal switch to open. Similar to the above fault, the opening of the third float switch 3 also cuts off the power supply circuit to the coil of the second relay U12. The second relay U12 is de-energized and releases, its normally closed contact closes, and the buzzer J65 sounds an alarm. Since the cylinder is empty and the liquid level cannot rise, the third float switch will remain open, therefore the buzzer J65 will continuously sound, clearly reminding the user to immediately replace the fuel cylinder to avoid system idling and business interruption.

[0061] This system also features a dry-run protection function: the first relay U10 has a delayed disconnection characteristic. If the pump continues to run for more than a set time (e.g., 1-2 minutes) due to insufficient liquid in the cylinder, the first relay U10 will automatically cut off the pump power supply, effectively preventing the pump body from running dry and causing damage, and extending the equipment life.

[0062] Please see Figure 8 This embodiment also provides a burner, which includes a liquid supply body 8 (with a volume ≤ 640 mL), a breather device 6 fixedly attached to one side of the top wall of the liquid supply body 8, an inlet pipe 4 fixedly connected to the connecting pipe between the breather device 6 and the liquid supply body 8, a flame arrestor mesh and activated carbon installed inside the breather device 6, and two outlet pipes 7 fixedly connected to the bottom of the side wall of the liquid supply body 8, and further includes:

[0063] The automatic control system of the above-mentioned intelligent safety dispenser for alcohol-based liquid fuels; and

[0064] Electrical box 5 is fixed to one side of the liquid dispenser body 8. The automatic control system of the alcohol-based liquid fuel intelligent safety liquid dispenser is installed in electrical box 5. The first float switch 1, the second float switch 2 and the third float switch 3 are all installed on the top wall of the liquid dispenser body 8. The installation height of the floats of the first float switch 1, the second float switch 2 and the third float switch 3 decreases in sequence.

[0065] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic control system for an intelligent safety fuel dispenser for alcohol-based liquids, characterized in that, include: A power conversion circuit is used to convert an external 220V voltage into the 12V voltage required by the system. The power conversion circuit includes a transformer U13, a voltage regulator U11 and a power connector J25. A fuse FU and a varistor R4 are connected between the transformer U13 and the power connector J25. An interface circuit, used to connect an external fuel delivery pump and system components, includes an eight-pin connector J24. A float control module is electrically connected to an interface circuit. The float control module includes a first float switch (1), a second float switch (2), and a third float switch (3). A relay control circuit is provided to cooperate with the float control module to control the working state of the entire system. The relay control circuit is electrically connected to the float control module. The relay control circuit includes a first relay U10 and a second relay U12. The first relay U10 is electrically connected to a first rectifier diode D7, and a first RC snubber circuit is provided between the first relay U10 and the first rectifier diode D7. The second relay U12 is electrically connected to a second rectifier diode D41, and a second RC snubber circuit is provided between the second relay U12 and the second rectifier diode D41. The first relay U10 is a time-delay relay. An alarm circuit is provided for performing an alarm operation. The alarm circuit is electrically connected to the relay control circuit and includes a buzzer J65. An indicator light circuit is provided to indicate the system's operating status. The indicator light circuit is electrically connected to the power conversion circuit and includes an LED D42.

2. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 1, characterized in that, The transformer U13 has its pin 1 connected in series with fuse FU and then its signal is connected to pin 1 of power connector J25. The transformer U13 has its pin 2 connected in series with pin 2 of power connector J25. The varistor R4 is connected in series between pins 1 and 2 of transformer U13. The transformer U13 has its pin 3 grounded. The transformer U13 has its pin 4 connected in series with pin 1 of voltage regulator U11. Capacitors C1 and C2 are connected in parallel between pins 2 and 3 of voltage regulator U11. The voltage regulator U11 has its pin 3 used to output 12V voltage. Power connector J25 is used to connect to an external 220V power supply.

3. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 2, characterized in that, Pins 1 and 2 of the eight-pin connector J24 are used to connect to the power input terminal of the external fuel delivery pump. Pin 3 of the eight-pin connector J24 is electrically connected to pin 3 of the voltage regulator U11. Pins 4, 5 and 7 of the eight-pin connector J24 are connected together.

4. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 3, characterized in that, The positive terminal of the first float switch (1) is electrically connected to pin 3 of the eight-pin connector J24, the negative terminal of the first float switch (1) is electrically connected to pin 4 of the eight-pin connector J24, the positive terminal of the second float switch (2) is electrically connected to pin 5 of the eight-pin connector J24, the negative terminal of the second float switch (2) is electrically connected to pin 6 of the eight-pin connector J24, the positive terminal of the third float switch (3) is electrically connected to pin 7 of the eight-pin connector J24, and the negative terminal of the third float switch (3) is electrically connected to pin 8 of the eight-pin connector J24.

5. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 4, characterized in that, The first relay U10's pin 1 is electrically connected to pin 6 of the eight-pin connector J24, the first relay U10's pin 2 is grounded, the first relay U10's pin 3 is electrically connected to pin 2 of the power connector J25, the first relay U10's pin 5 is electrically connected to pin 2 of the eight-pin connector J24, the first rectifier diode D7's pin 1 is electrically connected to the first relay U10's pin 1 after being connected in series with resistor R42, the first rectifier diode D7's pin 2 is grounded, and the first RC snubber circuit includes resistor R43 and capacitor C4, which are connected in series between the first relay U10's pin 1 and the first rectifier diode D7's pin 2. Pin 1 of the second relay U12 is electrically connected to pin 8 of the eight-pin connector J24. Pins 2 and 3 of the second relay U12 are grounded. Pin 1 of the second rectifier diode D41 is electrically connected to pin 1 of the second relay U12 after being connected in series with resistor R2336. Pin 2 of the second rectifier diode D41 is grounded. The second RC snubber circuit includes resistor R44 and capacitor C3, which are connected in series between pin 1 of the second relay U12 and pin 2 of the second rectifier diode D41.

6. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 5, characterized in that, Pin 1 of the buzzer J65 is electrically connected to pin 4 of the transformer U13, and pin 2 of the buzzer J65 is electrically connected to pin 5 of the second relay U12.

7. The automatic control system of the intelligent safe liquid fuel dispenser according to claim 6, characterized in that, The positive terminal of the LED lamp D42 is connected to pin 4 of the transformer U13 via a series resistor R2337, and the negative terminal of the LED lamp D42 is grounded.

8. A liquid dispenser, comprising a dispenser body (8), a breathing port device (6) fixedly attached to one side of the top wall of the dispenser body (8), an inlet pipe (4) fixedly connected to the connecting pipe between the breathing port device (6) and the dispenser body (8), the breathing port device (6) being equipped with a flame arrestor and activated carbon, and two outlet pipes (7) fixedly connected to the bottom of the side wall of the dispenser body (8), characterized in that, Also includes: The automatic control system of the intelligent safety liquid fuel dispenser as described in claim 1; as well as Electrical box (5) is fixed on one side of the liquid supply body (8). The automatic control system of the alcohol-based liquid fuel intelligent safety liquid supply device is installed in the electrical box (5). The first float switch (1), the second float switch (2) and the third float switch (3) are all installed on the top wall of the liquid supply body (8). The float installation height of the first float switch (1), the second float switch (2) and the third float switch (3) decreases in sequence.

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