Oil gun and oil filling system

Abstract

The invention provides a refueling gun and a refueling system, the refueling gun is configured to be electrically connected with a control system, the refueling gun comprises a gun nozzle and a gun body with an oil supply main path, and the gun nozzle is provided with an induction path used for inducting liquid level information; the pressure cavity is arranged in the gun body and is connected with the sensing access; the pressure sensing device is used for sensing pressure information of the pressure cavity; the control valve is used for controlling connection and disconnection between the oil supply main path and the gun nozzle in the oil inlet direction; a communication link is established among the control valve, the pressure sensing device and the control system, the communication link can transmit a preset signal based on the pressure information, and the control valve is configured to be controlled to be opened or closed based on the preset signal through the control system. According to the design of the oil gun, the structure of the tail end of the mechanical arm can be simplified, so that the tail end of the mechanical arm does not need to be provided with a special mechanical transmission structure, and the oil gun can be operated.

Description

Technical Field

[0001] The present application relates to the technical field of fuel filling equipment, and in particular to a refueling gun and a refueling system. Background Art

[0002] With the development of science and technology, automated robots are gradually being used in various industries, including the automatic refueling industry at gas stations. Refueling robots have been piloted in some gas stations and have achieved good results.

[0003] At present, the refueling robot is equipped with a refueling gun during the refueling process. When the refueling robot needs to refuel the car, the refueling robot's mechanical arm drives the refueling gun to move to the specified position and operates the switch handle of the refueling gun to open the refueling gun for refueling. Among them, the switch mechanism of the refueling gun is a relatively complex mechanical structure, which requires a special mechanical transmission structure to be set at the end of the mechanical arm to complete the operation of the switch handle of the refueling gun, and puts forward relatively high requirements on the positioning accuracy of the end of the mechanical arm. Summary of the invention

[0004] In order to solve at least one technical problem existing in the prior art, one object of the present application is to provide a refueling gun and a refueling system, the design of which can simplify the structure of the end of a robotic arm so that the end of the robotic arm does not need to be equipped with a special mechanical transmission structure to complete the operation of the refueling gun.

[0005] To achieve at least one of the above purposes, the present application adopts the following technical solutions:

[0006] A refueling gun, configured to be electrically connected to a control system, comprising: a gun nozzle and a gun body having a main oil supply path, the gun nozzle being provided with a sensing path for sensing liquid level information; a pressure chamber, provided in the gun body and connected to the sensing path; a pressure sensing device for sensing pressure information of the pressure chamber; a control valve, used to control the on-off between the main oil supply path and the gun nozzle in the oil inlet direction;

[0007] A communication link is established between the control valve, the pressure sensing device and the control system, and the communication link can transmit a preset signal based on the pressure information. The control valve is configured to be controlled to be opened or closed by the control system based on the preset signal.

[0008] As a preferred embodiment, the sensing passage includes: an anti-drip valve and a sensing pipeline connected thereto, and a sensing through hole arranged on the side wall of the gun nozzle and connected to the sensing pipeline, the anti-drip valve is arranged downstream of the control valve in the oil inlet direction, and the anti-drip valve is connected between the pressure chamber and the sensing pipeline.

[0009] As a preferred embodiment, the control valve and the pressure sensing device are connected via a first connecting device, which includes: a first conductive part and a second conductive part, and the first connecting device has a connection state in which the first conductive part and the second conductive part are engaged, and a cut-off state in which the first conductive part and the second conductive part are separated after the pressure information reaches a threshold value; in the cut-off state, the control system controls the control valve to close based on the current value on the communication link.

[0010] As a preferred implementation manner, a cable interface is provided on the gun body, and the control system is connected to the pressure sensing device and the control valve via the cable interface.

[0011] As a preferred embodiment, the pressure sensing device is connected to the cable interface via a second connecting device, the control valve is connected to the cable interface via a third connecting device, and a communication link is formed among the first connecting device, the second connecting device and the third connecting device; the control valve is a solenoid valve, and in the cut-off state, the control valve loses power and is disconnected, and the control system is configured to supply power to the control valve.

[0012] As a preferred embodiment, the pressure sensing device includes: a shell having a chamber, a diaphragm arranged in the chamber, wherein the pressure chamber is formed between the diaphragm and the bottom surface of the shell, the chamber is provided with a switching unit connected to the diaphragm, the switching unit is connected to the second conductive part, and the switching unit can follow the movement of the diaphragm to enable the first connecting device to switch between a connected state and a disconnected state.

[0013] As a preferred embodiment, the pressure sensing device also includes: a counterweight unit and a potential energy unit, the counterweight unit is connected to the diaphragm, the potential energy unit provides the counterweight unit with an elastic force to resist its own gravity, one end of the adapter unit is connected to the counterweight unit, and the second conductive part is provided at the other end of the adapter unit.

[0014] As a preferred embodiment, the first connecting device also includes a first wire, one end of which is connected to the first conductive part, and the other end of the first wire is connected to the control valve; the second connecting device includes a second wire, one end of which is connected to the second conductive part, and the other end of the second wire is connected to the cable interface; the third connecting device includes: a third wire and a fourth wire, one end of the third wire is connected to the control valve, and the other end of the third wire is connected to the wiring terminal; one end of the fourth wire is connected to the wiring terminal, and the other end of the fourth wire is connected to the cable interface.

[0015] As a preferred embodiment, the chamber of the shell further includes: an upper chamber and a lower chamber, the upper chamber and the lower chamber are separated by a partition, the first conductive part, the second conductive part and the terminal are all arranged in the upper chamber, the partition is provided with a channel for passing the adapter unit, and the adapter unit enters the upper chamber from the lower chamber via the channel from the position of the diaphragm.

[0016] As a preferred embodiment, a first interface and a second interface are provided on the shell corresponding to the upper chamber, the first wire and the third wire are inserted into the first interface through a first explosion-proof joint, and the second wire and the fourth wire are inserted into the second interface through a second explosion-proof joint.

[0017] As a preferred embodiment, the adapter unit has a hollow structure with a conductor arranged inside, the adapter unit has a first terminal and a second terminal, the second conductive part is connected to the conductor through the first terminal, and the second wire is connected to the conductor through the second terminal.

[0018] A refueling system comprises any one of the above-mentioned refueling guns and a control system.

[0019] As a preferred embodiment, it further comprises a refueling robot, and the refueling gun is attached to the refueling robot.

[0020] Beneficial effects:

[0021] The refueling gun and refueling system provided in the embodiment of the present application use a control valve to replace the switch handle of the traditional refueling gun, and by establishing a communication link between the control valve and the pressure sensing device and the control system, the control system can directly control the opening or closing of the control valve. The refueling gun can reduce the complexity of the mechanical arm of the refueling robot, so that the end of the mechanical arm does not need to be provided with a special mechanical transmission structure, and the end of the mechanical arm only needs to play the role of clamping the refueling gun, which simplifies the structure of the refueling robot, reduces the weight of the mechanical arm of the refueling robot and improves its stability.

[0022] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0023] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0024] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 Shown is a schematic diagram of the structure of a refueling gun in an embodiment of the present application;

[0027] Figure 2 The figure shows a schematic diagram of the internal structure of the pressure sensing device in the embodiment of the present application;

[0028] Figure 3 The figure shows the internal structure of the pressure sensing device in the cut-off state;

[0029] Figure 4 The figure shows a working flow chart of the refueling gun in the embodiment of the present application when refueling.

[0030] Description of reference numerals:

[0031] 1. Gun body; 2. Control valve; 3. Pressure sensing device; 30. Partition; 31. Counterweight unit; 32. Diaphragm; 33. Adapter unit; 34. Second conductive part; 35. First conductive part; 36. Vent; 37. First explosion-proof connector / second explosion-proof connector; 38. Wiring terminal; 39. Potential energy unit; 4. Anti-drip valve; 5. Sensing through hole; 6. Cable interface; 7. First connecting device; 71. First wire; 72. Third wire; 8. Second connecting device; 81. Second wire; 82. Fourth wire; 9. Gun nozzle; 10. Pressure chamber. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] like Figure 1 As shown, the present specification provides a refueling gun, which is configured to be electrically connected to a control system (not shown), and the refueling gun includes: a gun nozzle 9 and a gun body 1 with a main oil supply path, the gun nozzle 9 is provided with a sensing path for sensing liquid level information; a pressure chamber 10, which is arranged in the gun body 1 and connected to the sensing path; a pressure sensing device 3 for sensing pressure information of the pressure chamber 10; a control valve 2, which is used to control the on-off between the main oil supply path and the gun nozzle 9 in the oil inlet direction; a communication link is established between the control valve 2, the pressure sensing device 3 and the control system, and the communication link can transmit a preset signal based on the pressure information, and the control valve 2 is configured to be controlled to be opened or closed by the control system based on the preset signal.

[0035] The fueling gun provided in this specification uses a control valve to replace the switch handle of a traditional fueling gun, and by establishing a communication link between the control valve and the pressure sensing device and the control system, the control system can directly control the opening or closing of the control valve. The fueling gun can reduce the complexity of the mechanical arm of the fueling robot, so that the end of the mechanical arm does not need to be provided with a special mechanical transmission structure.

[0036] The main oil supply line of the refueling gun is connected to the refueling pump. When the refueling pump is started and the control valve is in the open state, the oil is pumped out by the refueling pump and supplied to the fuel tank through the main oil supply line, the control valve, the gun nozzle, and the oil tank. When refueling in a fixed quantity, after the control system starts refueling, it controls the start and stop of the refueling system according to the accumulated flow of the flow meter. In this state, the induction path of the refueling gun is always connected to the air. At this time, the control valve of the refueling gun is completely controlled by the control system of the refueling robot. When the flow meter accumulates to the specified flow, the control system issues a stop command, and the control valve and the refueling pump are closed, and the refueling process ends.

[0037] In this specification, the control valve 2 has an open state and a closed state. In the open state, the oil can reach the nozzle 9 through the main oil supply path; in the closed state, the oil can be blocked and will not be supplied to the nozzle 9. In order to realize the electric control of the control valve 2 by the control system, the control valve 2 is preferably a solenoid valve. When the control valve 2 is a solenoid valve, the control system is also configured to provide electrical energy to the solenoid valve, so as to control the solenoid valve to be closed or disconnected after power is supplied, so as to realize the connection and disconnection between the main oil supply path and the nozzle 9. When the refueling gun is refueling the fuel tank, it is often necessary to determine whether the oil in the fuel tank is full. The traditional refueling gun is equipped with an automatic gun jump mechanism. After determining that the oil is full, the valve is closed by the automatic gun jump mechanism inside the refueling gun to block the continued supply of oil. In this specification, the refueling gun is equipped with an induction path, a pressure chamber and a pressure sensing device, and the three are coordinated to determine whether the fuel tank is full.

[0038] In some embodiments, the sensing passage includes: an anti-drip valve 4 and a sensing pipeline connected thereto, and a sensing through hole 5 arranged on the side wall of the nozzle 9 and connected to the sensing pipeline. In the oil inlet direction, the anti-drip valve 4 is arranged downstream of the control valve 2, and the anti-drip valve 4 is connected between the pressure chamber 10 and the sensing pipeline.

[0039] Specifically, the anti-drip valve 4 is located downstream of the control valve 2 in the oil inlet direction. Under the premise that the control valve 2 is open, when the oil reaches the anti-drip valve 4, the anti-drip valve 4 is automatically opened by the oil pressure, and then enters the gun nozzle 9, and supplies oil to the fuel tank through the outlet of the gun nozzle 9. Among them, the anti-drip valve 4 is also connected to a sensing pipeline, and the sensing pipeline is connected to the sensing through hole 5 on the side wall of the gun nozzle 9. The sensing through hole 5 is generally located upstream of the outlet of the gun nozzle 9. As the gasoline is filled into the fuel tank, the air in the fuel tank continuously enters the sensing pipeline through the sensing through hole 5 and enters the pressure chamber 10 along the sensing pipeline. However, when the fuel tank is about to be filled, even the oil blocks the sensing through hole 5, no gas will enter the pressure chamber 10 along the sensing pipeline, which causes the pressure in the pressure chamber 10 to change. After sensing this change, the pressure sensing device 3 can transmit a preset signal to the control system through the communication link, and then the control system controls the control valve 2 to close to cut off the main oil supply route to supply oil to the gun nozzle 9. When the control valve 2 is closed, no more oil passes through the anti-drip valve 4, and the spring inside the anti-drip valve 4 automatically returns to close, ending the oil supply process.

[0040] In order to ensure that the air in the oil tank can enter the pressure chamber 10 during the filling process, it is necessary to form a negative pressure upstream of the sensing pipeline to suck the air into the sensing pipeline. Furthermore, the anti-drip valve 4 can often form this "negative pressure" effect. The anti-drip valve 4 generally has two flow channels, one is the main flow channel through which the oil can pass to enter the gun nozzle 9; the other flow channel is used to connect the sensing pipeline to transport air to the pressure chamber 10. The gap of the main flow channel is small, and the flow rate of gasoline increases when passing through, thereby forming a "Venturi effect" there. A hole can be set on the main body of the anti-drip valve 4, and the hole can connect the sensing pipeline and the pressure chamber 10 to introduce the "Venturi effect" on the main flow channel into the sensing pipeline and the pressure chamber 10.

[0041] It should be noted that the Venturi effect caused by the anti-drip valve is a common setting of the refueling gun in the prior art, and this specification will not be repeated here, only to enable a simple understanding of the principle of the refueling gun jumping. The connection method of the anti-drip valve and the pressure chamber is not specifically limited in this application, and can also be transformed into other connection structures. As long as they can play the same substantial role, they are within the scope of protection of this application.

[0042] In one embodiment, the control valve 2 is connected to the pressure sensing device 3 via a first connecting device 7, which includes: a first conductive part 35 and a second conductive part 34. The first connecting device 7 has a connection state in which the first conductive part 35 and the second conductive part 34 are engaged, and a cut-off state in which the first conductive part 35 and the second conductive part 34 are separated after the pressure information reaches a threshold value; in the cut-off state, the control system controls the control valve 2 to close based on the current value on the communication link.

[0043] In this embodiment, the control system has a detection module, which can detect the current value of the communication link and control the control valve 2 to a closed state based on the detected current value. Figure 1 As shown, the gun body 1 is provided with a cable interface 6, and the control system is connected to the pressure sensing device 3 and the control valve 2 through the cable interface 6. The communication link is a wired connection, and the control system can be connected to the cable interface 6 through a cable.

[0044] In this embodiment, the pressure sensing device 3 is connected to the cable interface 6 via a second connecting device 8, the control valve 2 is connected to the cable interface 6 via a third connecting device, and a communication link is formed between the first connecting device 7, the second connecting device 8 and the third connecting device; the control valve 2 is a solenoid valve, and in the cut-off state, the control valve 2 loses power and is disconnected, and the control system is configured to supply power to the control valve 2.

[0045] In this embodiment, the pressure sensing device 3, the control system, and the control valve 2 form a series control loop, and the control system supplies power to the control valve 2 and provides electrical energy. The starting point of the entire control loop is the control system, which is connected to the pressure sensing device 3 through the cable interface 6 via the second connection device 8, and then connected to the control valve 2 through the first connection device 7, and then returned to the cable interface 6 and the control system through the third connection device. The control valve 2 is a solenoid valve, which is normally open or normally closed. Preferably, the solenoid valve is a direct-acting normally closed type, and the working voltage is selected as 24VDC. The control system applies a 24V DC voltage to the solenoid valve and detects the current of the entire control loop. When the control system issues a refueling command, it starts the refueling pump and provides a 24V DC voltage to the refueling gun. When the control system detects that the control loop current is less than the threshold, the control system determines that the refueling operation is completed and cuts off the 24V power supply.

[0046] In one embodiment, Figure 2 and Figure 3 As shown, the pressure sensing device 3 includes: a shell having a chamber, a diaphragm 32 arranged in the chamber, wherein the pressure chamber 10 is formed between the diaphragm 32 and the bottom surface of the shell, and the chamber is provided with a switching unit 33 connected to the diaphragm 32, the switching unit 33 is connected to the second conductive part 34, and the switching unit 33 can move with the diaphragm 32 so that the first connecting device 7 can switch between a connected state and a disconnected state.

[0047] Specifically, the pressure sensing device 3 is arranged in the gun body 1, and the pressure chamber 10 is located inside the shell chamber of the pressure sensing device 3, and is formed by the diaphragm 32 and the bottom surface of the shell. Therefore, when the pressure inside the pressure chamber 10 changes, this change will be reflected on the diaphragm 32. The bottom surface of the shell is also provided with a vent hole 36 for connecting the anti-drip valve 4 and the sensing pipeline. The adapter unit 33 is connected to the diaphragm 32. When the pressure inside the pressure chamber 10 changes, the adapter unit 33 will follow the movement of the diaphragm 32, and the second conductive part 34 will also follow the movement, and the first conductive part 35 and the second conductive part 34 will switch between the state of engagement and separation. Therefore, when the pressure information of the pressure chamber 10 reaches the threshold, the first conductive part 35 and the second conductive part 34 will separate, and the threshold of the pressure information is the pressure when the first conductive part 35 and the second conductive part 34 are separated.

[0048] The first conductive part 34 and the second conductive part 35 may be made of metal, or made of conductive material, and may be metal conductive sheets.

[0049] Furthermore, the pressure sensing device 3 also includes: a counterweight unit 31 and a potential energy unit 39, the counterweight unit 31 is connected to the diaphragm 32, the potential energy unit 39 provides the counterweight unit 31 with an elastic force to resist its own gravity, one end of the adapter unit 33 is connected to the counterweight unit 31, and the other end of the adapter unit 33 is provided with the second conductive part 34.

[0050] The counterweight unit 31 is a block structure, not limited to square, columnar, regular or irregular structures, and acts on the diaphragm 32. The potential energy unit 39 is an elastic member with elastic potential energy, and the potential energy unit 39 and the pressure in the pressure chamber 10 acting on the diaphragm 32 cooperate to resist the gravity of the counterweight unit 31.

[0051] In one application scenario, the potential energy unit 39 provides a pulling force for the counterweight unit 31, and the pulling force and the pressure inside the pressure chamber 10 work together to resist the gravity of the counterweight unit 31. When the pressure inside the pressure chamber 10 decreases, the diaphragm 32 drops, the pulling force on the potential energy unit 39 increases and is stretched, and the counterweight unit 31 drives the adapter unit 33 to move downward. Of course, in another application scenario, the potential energy unit 39 provides a thrust for the counterweight unit 31, and the thrust and the pressure inside the pressure chamber 10 work together to resist the gravity of the counterweight unit 31. When the pressure inside the pressure chamber 10 decreases, the diaphragm 32 drops, the thrust on the potential energy unit 39 increases and is compressed, and the counterweight unit 31 drives the adapter unit 33 to move downward.

[0052] like Figures 2 to 4 As shown, when the gasoline in the fuel tank is full, since no air enters the pressure chamber 10 along the sensing pipeline, the pressure in the pressure chamber 10 decreases, the counterweight unit 31 acting on the diaphragm 32 drops, driving the adapter unit 33 to drop, which directly causes the first conductive part 35 and the second conductive part 34 to separate, and the series control loop formed by the pressure sensing device 3, the control system, and the control valve 2 is broken. When the control valve 2 is a solenoid valve, it will cause the solenoid valve to lose power directly, thereby disconnecting the main oil supply line from supplying oil to the gun nozzle 9. The control system controls the solenoid valve to close based on the circuit breaker of the series control loop, that is, cuts off the 24V power supply.

[0053] Then, the anti-drip valve 4 is restored under the action of the internal spring because it is not subjected to oil pressure, the main flow channel of the anti-drip valve 4 is closed, and the pressure in the pressure chamber 10 is restored to the level before oil supply and acts on the diaphragm 32. Under the action of the potential energy unit 39, the counterweight unit 31 drives the adapter unit 33 to move upward, and reconnects the first conductive part 34 and the second conductive part 35, so that the entire series control circuit is reconnected. Since the control system has cut off the power supply, the solenoid valve will not open again to cause oil spills. The refueling gun resumes the standby state, and the refueling robot draws the gun to wait for the next refueling operation.

[0054] In this embodiment, through the internal structure of the pressure sensing device 3 and the communication link formed with the solenoid valve and the control system, when the gasoline oil level reaches the sensing through hole 5 and the pressure in the pressure chamber 10 changes, the communication link can respond quickly and the solenoid valve loses power and closes. At this time, the control system detects the current value of the series control loop and cancels the power supply to the solenoid valve, then pulls out the fuel gun, and will not re-trigger the fuel gun to refuel.

[0055] In one embodiment, the first connecting device 7 also includes a first wire 71, one end of which is connected to the first conductive part 35, and the other end of which is connected to the control valve 2; the second connecting device 8 includes a second wire 81, one end of which is connected to the second conductive part 34, and the other end of which is connected to the cable interface 6; the third connecting device includes: a third wire 72 and a fourth wire 82, one end of the third wire 72 is connected to the control valve 2, and the other end of the third wire 72 is connected to the wiring terminal 38; one end of the fourth wire 82 is connected to the wiring terminal 38, and the other end of the fourth wire 82 is connected to the cable interface 6.

[0056] In this embodiment, the control valve 2 is a solenoid valve, the solenoid valve coil is connected to the first wire 71 and the third wire 72 respectively, the other end of the first wire 71 is connected to the first conductive part 35, and the other end of the third wire 72 is connected to the fourth wire 82 through the terminal 38. The other end of the fourth wire 82 is connected to the cable interface 6, one end of the second wire 81 is connected to the cable interface 6, and the other end of the second wire 81 is connected to the second conductive part 34. Thus, the second wire 81 and the fourth wire 82 are connected to the cable interface 6 of the gun body 1 as a two-core cable, and the cable interface 6 can be connected to the control system by a cable also having two cores.

[0057] Furthermore, the chamber of the shell of the pressure sensing device 3 also includes: an upper chamber and a lower chamber, the upper chamber and the lower chamber are separated by a partition 30, the first conductive part 35, the second conductive part 34 and the connecting terminal 38 are all arranged in the upper chamber, the partition 30 is provided with a channel for passing the adapter unit 33, and the adapter unit 33 enters the upper chamber from the lower chamber via the channel from the position of the diaphragm 32.

[0058] In this embodiment, by dividing the partition 30 into an upper chamber and a lower chamber, and placing all the conductive components in the upper chamber, the fuel gun has a better explosion-proof effect. The upper chamber is farther away from the pressure chamber 10 than the lower chamber, that is, the upper chamber is separated from the pressure chamber 10 by the lower chamber. In this way, even if the oil and gas concentration inside the pressure chamber 10 may be relatively high, the first conductive part 35, the second conductive part 34, and the terminal 38 installed in the upper chamber can be prevented from causing an explosion hazard due to the high oil and gas concentration.

[0059] In order to further improve the explosion-proof effect, a first interface and a second interface are provided on the shell corresponding to the upper chamber, and the first wire 71 and the third wire 72 are inserted into the first interface through the first explosion-proof joint 37 to introduce the first conductive part 35 and the terminal 38 into the upper chamber; the second wire 81 and the fourth wire 82 are inserted into the second interface through the second explosion-proof joint 37 to introduce the second conductive part 34 into the upper chamber.

[0060] In order to ensure the explosion-proof effect of the upper chamber, the adapter unit 33 also has a hollow structure, in which a conductor is arranged, and the adapter unit 33 has a first terminal and a second terminal, the second conductive part 34 is connected to the conductor through the first terminal, and the second wire 81 is connected to the conductor through the second terminal. The adapter unit 33 can be a cylindrical shaft, and the outside is wrapped with insulating material to ensure that it is insulated from the shell of the pressure sensing device 3. Two terminals are set on the cylindrical shaft for the external wire to be electrically connected with the conductor inside the cylindrical shaft.

[0061] This specification also provides a refueling system, including any of the above-mentioned refueling guns and control systems. The refueling system provided in this specification can achieve the technical problems solved by the above-mentioned embodiments and correspondingly achieve the technical effects of the above-mentioned implementation methods, and the specific application will not be repeated here.

[0062] In this specification, the refueling system also includes a refueling robot, and the refueling gun is attached to the refueling robot. When the refueling gun is used in conjunction with the refueling robot, a conventional hose can be used to connect to the refueling machine to reliably fix the mechanical arm of the refueling robot and the refueling gun.

[0063] In one application scenario, when the refueling robot needs to refuel a car, the refueling robot's mechanical arm drives the oil gun to move to the designated position, opens the car's fuel tank cap, and moves the refueling gun to the designated position. At this time, the refueling gun is still in standby mode, and the control valve is closed. The control system can provide a DC voltage to the refueling gun to open the control valve. When the control system issues a refueling command, the refueling pump is started, and the oil enters the gun nozzle through the control valve and anti-drip valve to refuel the car's fuel tank.

[0064] For the refueling robot used in conjunction with the present refueling gun, the end of the robot's mechanical arm only needs a simple clamping device to complete the connection with the gun, reducing the back-end operation of the traditional refueling gun switch handle.

[0065] In addition, when refueling in a fixed quantity, after the control system starts refueling, it controls the start and stop of the refueling system according to the accumulated flow of the flow meter. In this state, the sensing through hole of the refueling gun is always connected to the air, and the first conductive part and the second conductive part of the first connecting device are always in a connected state. At this time, the control valve of the refueling gun is completely controlled by the control system. When the flow meter accumulates to the specified flow, the control system issues a stop command, the control valve and the refueling pump are closed, and the refueling process ends.

[0066] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0067] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A refueling gun, characterized in that: The fueling gun is configured to be electrically connected to a control system, and comprises: a nozzle and a gun body having a main oil supply path, the nozzle is provided with a sensing path for sensing liquid level information; a pressure chamber, which is provided in the gun body and connected to the sensing path; a pressure sensing device for sensing pressure information of the pressure chamber; and a control valve, which is used to control the on-off between the main oil supply path and the nozzle in the oil inlet direction; A communication link is established between the control valve, the pressure sensing device and the control system, and the communication link can transmit a preset signal based on the pressure information. The control valve is configured to be controlled to be opened or closed by the control system based on the preset signal.

2. The refueling gun according to claim 1, characterized in that: The sensing passage includes: an anti-drip valve and a sensing pipeline connected thereto, and a sensing through hole arranged on the side wall of the gun nozzle and connected to the sensing pipeline. The anti-drip valve is arranged downstream of the control valve in the oil inlet direction, and the anti-drip valve is connected between the pressure chamber and the sensing pipeline.

3. The refueling gun according to claim 1, characterized in that: The control valve and the pressure sensing device are connected via a first connecting device, which includes: a first conductive part and a second conductive part. The first connecting device has a connection state in which the first conductive part and the second conductive part are engaged, and a cut-off state in which the first conductive part and the second conductive part are separated after the pressure information reaches a threshold value; in the cut-off state, the control system controls the control valve to close based on the current value on the communication link.

4. The refueling gun according to claim 3, characterized in that: The gun body is provided with a cable interface, and the control system is connected with the pressure sensing device and the control valve via the cable interface.

5. The refueling gun according to claim 4, characterized in that: The pressure sensing device is connected to the cable interface via a second connecting device, the control valve is connected to the cable interface via a third connecting device, and a communication link is formed among the first connecting device, the second connecting device and the third connecting device; the control valve is a solenoid valve, and in the cut-off state, the control valve loses power and is disconnected, and the control system is configured to supply power to the control valve.

6. The refueling gun according to claim 4, characterized in that: The pressure sensing device includes: a shell having a chamber, a diaphragm arranged in the chamber, wherein the pressure chamber is formed between the diaphragm and the bottom surface of the shell, the chamber is provided with a switching unit connected to the diaphragm, the switching unit is connected to the second conductive part, and the switching unit can follow the movement of the diaphragm to enable the first connecting device to switch between a connected state and a disconnected state.

7. The refueling gun according to claim 6, characterized in that: The pressure sensing device also includes: a counterweight unit and a potential energy unit, the counterweight unit is connected to the diaphragm, the potential energy unit provides the counterweight unit with elastic force to resist its own gravity, one end of the adapter unit is connected to the counterweight unit, and the other end of the adapter unit is provided with the second conductive part.

8. The refueling gun according to claim 6, characterized in that: The first connection device further comprises a first wire, one end of which is connected to the first conductive part, and the other end of which is connected to the control valve; the second connection device comprises a second wire, one end of which is connected to the second conductive part, and the other end of which is connected to the cable interface; The third connecting device comprises: a third wire and a fourth wire, one end of the third wire is connected to the control valve, and the other end of the third wire is connected to the wiring terminal; One end of the fourth wire is connected to the wiring terminal, and the other end of the fourth wire is connected to the cable interface.

9. The refueling gun according to claim 8, characterized in that: The chamber of the shell also includes: an upper chamber and a lower chamber, the upper chamber and the lower chamber are separated by a partition, the first conductive part, the second conductive part and the terminal are all arranged in the upper chamber, the partition is provided with a channel for passing the adapter unit, and the adapter unit enters the upper chamber from the lower chamber via the channel at the location of the diaphragm.

10. The refueling gun according to claim 9, characterized in that: A first interface and a second interface are provided on the shell corresponding to the upper chamber, the first wire and the third wire are inserted into the first interface through a first explosion-proof joint, and the second wire and the fourth wire are inserted into the second interface through a second explosion-proof joint.

11. The refueling gun according to claim 9, characterized in that: The adapter unit has a hollow structure with a conductor disposed therein. The adapter unit has a first terminal and a second terminal. The second conductive portion is connected to the conductor via the first terminal, and the second wire is connected to the conductor via the second terminal.

12. A refueling system, characterized in that: It comprises a refueling gun and a control system as described in any one of claims 1 to 11.

13. The refueling system according to claim 12, characterized in that: Also included is a refueling robot, to which the refueling gun is attached.

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