Liquid fuel discharge method and application thereof

Abstract

The present invention relates to a liquid fuel discharge method and its application, belonging to the technical field of underwater vehicles, and the discharge method comprises the following steps: 1) depressurizing the fuel tank of the recovered underwater vehicle; 2) using a fuel filling vehicle to vacuumize a fuel tank connected to the fuel tank when the vacuum hole of the fuel tank is open, and discharge the liquid fuel in the fuel tank into the fuel tank. The liquid fuel discharge method of the present invention uses a fuel filling vehicle to vacuumize a fuel tank connected to the depressurized fuel tank, so that the fuel tank is in a negative pressure state, and the fuel tank is in a positive pressure state when its vacuum hole is open, so that the pressure difference between the fuel tank and the fuel tank can be used to discharge the liquid fuel in the fuel tank into the fuel tank, and ensure that the fuel tank will not generate the safety problem of fuel spraying during the process of discharging the liquid fuel. The discharge method is easy to operate and not prone to abnormal failures, and can ensure the safety of operators and underwater vehicle products.

Description

Liquid fuel discharge method and application thereof Technical Field

[0001] The present invention relates to the technical field of underwater vehicles, and in particular to a liquid fuel discharge method and application thereof. Background Art

[0002] Thermal-powered underwater vehicles that use liquid fuel are affected by many factors during training, such as trajectory planning and environmental adaptation. Generally, there is a certain amount of fuel remaining at the end of the voyage. For the safety of personnel and underwater vehicle products, the remaining fuel in the underwater vehicle's fuel tank is usually discharged when all products are recovered.

[0003] The existing discharge method is to use the exhaust gas of the fuel filling vehicle to pressurize the fuel tank (as shown in Figure 1), squeeze out the liquid fuel in the fuel tank and discharge it into the fuel tank. This liquid fuel discharge method has two obvious defects:

[0004] First, the exhaust of the fuel filling truck uses the gas generated by the vacuum pump when it is working. There is no overflow device on the gas passage, so the amount of gas entering the fuel tank cannot be controlled and the operation is inconvenient;

[0005] Second, the entire discharge system (a system formed by fuel tanks, fuel tanks, fuel filling trucks and various connecting pipelines) is in a state of internal pressure during the liquid fuel discharge process, and the internal pressure cannot be controlled. During the discharge process, a large amount of liquid fuel is sprayed out, posing a personal safety hazard to the operators and a risk to product safety. Summary of the invention

[0006] In order to solve the safety problems caused by the discharge of liquid fuel in the prior art, the present invention provides a liquid fuel discharge method and application thereof, which is suitable for the recovery and discharge of liquid fuel in a fuel tank of an underwater vehicle.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions.

[0008] In a first aspect, the present invention provides a method for discharging liquid fuel, comprising the following steps:

[0009] 1) Depressurize the fuel tank of the recovered underwater vehicle;

[0010] 2) With the vacuum hole of the fuel tank open, use a fuel filling truck to vacuum the fuel tank connected to the fuel tank and drain the liquid fuel in the fuel tank into the fuel tank.

[0011] As an optional embodiment, the fuel tank includes a front gas pressurized fuel tank (referred to as the front fuel tank) and a rear fuel supply tank (rear fuel tank), and an anti-swaying bulkhead is provided in the rear fuel tank. The anti-swaying bulkhead is used to prevent the fuel-entrained gas from entering the fuel pipe in the rear fuel tank and then entering the power system when the underwater vehicle is maneuvering.

[0012] In the present invention, the fuel tank mainly includes a front gas pressurized fuel tank and a rear fuel supply tank, and an anti-swaying bulkhead is arranged in the rear fuel tank; the anti-swaying bulkhead divides the rear fuel tank into two parts: an inner chamber and an outer chamber. The anti-swaying bulkhead is arranged with a gas delivery pipe to prevent the fuel from entraining gas into the fuel pipe in the rear fuel tank and then into the power system when the underwater vehicle is maneuvering.

[0013] As an optional implementation, in step 2), the air extraction hole of the fuel filling vehicle is connected to the air inlet of the fuel tank through a pipeline, the filling hole of the fuel tank is connected to the liquid outlet of the fuel tank through a pipeline, the vacuum hole of the fuel tank is opened, and the vacuum pump of the fuel filling vehicle is started to vacuum the fuel tank, and the fuel inside the fuel tank is discharged into the fuel tank.

[0014] As an optional implementation, in step 2), during the process of discharging the liquid fuel in the fuel tank into the fuel tank, the internal pressure of the fuel tank is lower than the internal pressure of the fuel tank.

[0015] In the present invention, the fuel filling vehicle, the fuel tank and the fuel cabin are connected in sequence, the fuel tank is evacuated with the vacuum hole of the fuel cabin opened, and the fuel inside the fuel cabin is discharged into the fuel tank by using the pressure difference.

[0016] As an optional embodiment, in step 2), during the process of evacuating the fuel tank, the internal pressure (or vacuum degree) of the fuel tank is controlled by the regulating valve of the fuel filling vehicle to discharge the fuel inside the fuel compartment into the fuel tank.

[0017] As an optional implementation, in step 2), the internal pressure of the fuel tank is controlled to be in a negative pressure state by a regulating valve of the fuel filling vehicle. Negative pressure here is relative to atmospheric pressure, and pressure lower than atmospheric pressure is called negative pressure.

[0018] The present invention uses the vacuum pump of the fuel filling vehicle to evacuate the fuel tank, and controls the internal pressure of the fuel tank through the regulating valve of the fuel filling vehicle to make the fuel tank in a negative pressure state; because the vacuum hole of the fuel tank is opened during the process of evacuating the fuel tank, the fuel tank is in a positive pressure state at this time, so that the internal pressure of the fuel tank is greater than the internal pressure of the fuel tank. Under the pressure difference between the two, the liquid fuel in the fuel tank is squeezed and discharged into the fuel tank. This operation ensures that the fuel tank will not produce a safety problem of fuel spraying during the process of discharging liquid fuel.

[0019] As an optional implementation, in step 2), the internal pressure of the fuel tank is controlled to be -0.038 to -0.042 MPa (eg, -0.04 MPa) by a regulating valve of the fuel filling vehicle.

[0020] In a second aspect, the present invention also provides an application of the above-mentioned liquid fuel discharge method, which is suitable for the discharge and recovery of liquid fuel in the fuel tank of an underwater vehicle.

[0021] In the present invention, the above technical features can be freely combined to form a new technical solution without conflicting with each other.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0023] (1) The liquid fuel discharge method provided by the present invention comprises connecting a fuel filling vehicle, a fuel tank and a fuel tank in sequence, evacuating the fuel tank while the vacuum hole of the fuel tank is open, and utilizing the pressure difference to discharge the fuel inside the fuel tank into the fuel tank;

[0024] (2) The liquid fuel discharge method provided by the present invention uses a fuel filling vehicle to evacuate the fuel tank and the depressurized fuel tank, so that the fuel tank is in a negative pressure state during the liquid fuel discharge process, which can ensure that there will be no safety problems such as fuel spraying during the liquid fuel discharge process of the fuel tank;

[0025] (3) The liquid fuel discharge method provided by the present invention is suitable for the discharge and recovery of liquid fuel in the fuel tank of an underwater vehicle. It is easy to operate and is not prone to abnormal failures, and can well ensure the safety of operators and underwater vehicle products. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] FIG1 is a schematic diagram showing a conventional connection of a liquid fuel discharge device for a fuel tank of an underwater vehicle;

[0028] FIG. 2 is a schematic diagram showing the connection of a liquid fuel discharge device according to the present invention.

[0029] Among them, the figure markings are: 1-fuel filling vehicle, 2-fuel compartment, 3-fuel tank, 4-exhaust hole, 5-air extraction hole, 6-regulating valve, 7-vacuum extraction hole, 8-filling hole, 9-liquid outlet, 10-air inlet. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0032] Example 1

[0033] A liquid fuel discharge method is applicable to the discharge of liquid fuel from a fuel tank of an underwater vehicle. The discharge method uses a fuel filling vehicle to discharge the liquid fuel in the fuel tank recovered by the underwater vehicle during actual navigation into a fuel tank, and specifically comprises the following steps:

[0034] Step S1: depressurizing the fuel tank recovered during actual flight;

[0035] Step S2: As shown in Figure 2, before the fuel is discharged, the air extraction hole 5 of the fuel filling vehicle 1 is connected to the air inlet 10 of the fuel tank 3 through a pipeline, the filling hole 8 of the fuel compartment 2 is connected to the liquid outlet 9 of the fuel tank 3 through a pipeline, the vacuum hole 7 of the fuel compartment 2 is opened, the fuel filling vehicle 1 is started, and the vacuum degree of the fuel tank 3 is controlled by the regulating valve 6 of the fuel filling vehicle 1 to discharge the remaining fuel inside the fuel compartment 2 into the fuel tank 3.

[0036] The liquid fuel discharge method of this embodiment is used to discharge and recover the liquid fuel from the fuel tank of the recovered underwater vehicle product, and then the liquid fuel is refilled to carry out the actual flight test of the underwater vehicle product. After hundreds of actual flight test recovery, the underwater vehicle product is in good use.

[0037] It can be seen that the fuel discharge method of the present invention is used to discharge liquid fuel from the fuel tank of the underwater product recovered during actual navigation. The operation is convenient and no abnormal failure occurs. At the same time, the safety of the operators and the products is well guaranteed.

[0038] Comparative Example 1

[0039] A liquid fuel discharge method is used for discharging liquid fuel from a fuel tank recovered by an underwater vehicle during actual navigation. The discharge method uses a fuel filling vehicle to discharge the liquid fuel in the fuel tank recovered by the underwater vehicle during actual navigation into a fuel tank, and specifically comprises the following steps:

[0040] As shown in Figure 1, before the fuel is discharged, the exhaust hole 4 of the fuel filling vehicle 1 is connected to the vacuum hole 7 of the fuel tank 2 through a pipeline, and the filling hole 8 of the fuel tank 2 is connected to the liquid outlet 9 of the fuel tank 3 through a pipeline. The fuel filling vehicle 1 is opened to discharge the gas in the fuel filling vehicle to the fuel tank 2, so that the internal pressure of the fuel tank 2 is squeezed out and discharged into the fuel tank 3 by utilizing the pressure difference between the fuel tank 2 and the fuel tank 3.

[0041] The discharge method provided in this comparative example belongs to the conventional method of discharging liquid fuel from the fuel tank recovered by the actual navigation of the underwater vehicle. It uses the exhaust gas of the fuel filling vehicle to pressurize the fuel tank and discharge the liquid fuel in the fuel tank to the fuel tank 3. Since the exhaust gas of the fuel filling vehicle uses the gas generated when the vacuum pump is working, there is no overflow device on the gas passage, so the amount of gas entering the fuel tank cannot be controlled, and the operation is inconvenient. In addition, the entire discharge system (a system formed by the fuel tank, fuel tank, fuel filling vehicle and various connecting pipelines) is in a state of internal pressure during the liquid fuel discharge process, and the internal pressure cannot be controlled. There is a large amount of liquid fuel spraying out during the discharge process, which poses a personal safety hazard to the operator and a risk to product safety.

[0042] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for discharging liquid fuel, characterized in that: The discharge method comprises the following steps: 1) depressurizing the fuel tank of the recovered underwater vehicle; 2) using a fuel filling vehicle to evacuate the fuel tank connected to the fuel tank while the vacuum hole of the fuel tank is open, and discharging the liquid fuel in the fuel tank into the fuel tank.

2. The method for discharging liquid fuel according to claim 1, characterized in that: The fuel tank includes a front gas pressurized fuel tank and a rear fuel supply tank. The rear fuel supply tank is provided with an anti-swaying bulkhead, which is used to prevent the fuel-entrained gas from entering the fuel pipe in the rear fuel supply tank and then entering the power system when the underwater vehicle is maneuvering.

3. The liquid fuel discharge method according to claim 1 or 2, characterized in that: In step 2), the air extraction hole of the fuel filling vehicle is connected to the air inlet of the fuel tank through a pipeline, the filling hole of the fuel tank is connected to the liquid outlet of the fuel tank through a pipeline, the vacuum hole of the fuel tank is opened, and the vacuum pump of the fuel filling vehicle is started to vacuum the fuel tank, and the fuel inside the fuel tank is discharged into the fuel tank.

4. The liquid fuel discharge method according to claim 1 or 2, characterized in that: In step 2), during the process of discharging the liquid fuel in the fuel tank into the fuel tank, the internal pressure of the fuel tank is lower than the internal pressure of the fuel tank.

5. The liquid fuel discharge method according to claim 1 or 2, characterized in that: In step 2), during the process of evacuating the fuel tank, the internal pressure of the fuel tank is controlled by the regulating valve of the fuel filling vehicle, and the fuel inside the fuel tank is discharged into the fuel tank.

6. The method for discharging liquid fuel according to claim 3, characterized in that: In step 2), during the process of evacuating the fuel tank, the internal pressure of the fuel tank is controlled by the regulating valve of the fuel filling vehicle, and the fuel inside the fuel tank is discharged into the fuel tank.

7. The method for discharging liquid fuel according to claim 5, characterized in that: In step 2), the internal pressure of the fuel tank is controlled to be in a negative pressure state by a regulating valve of the fuel filling vehicle.

8. The method for discharging liquid fuel according to claim 6, characterized in that: In step 2), the internal pressure of the fuel tank is controlled to be in a negative pressure state by a regulating valve of the fuel filling vehicle.

9. The method for discharging liquid fuel according to claim 7 or 8, characterized in that: In step 2), the internal pressure of the fuel tank is controlled to be -0.038 to -0.042 MPa by the regulating valve of the fuel filling vehicle.

10. An application of the liquid fuel discharge method according to any one of claims 1 to 9, wherein the discharge method is suitable for discharge and recovery of liquid fuel in a fuel tank of an underwater vehicle.

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