Liquid fuel emergency discharge method and application thereof

Abstract

The present invention relates to an emergency discharge method for liquid fuel and its application, belonging to the technical field of underwater vehicles. The emergency discharge method comprises the following steps: 1) depressurizing the recovered fuel tank; 2) using the vacuum pump in the fuel filling vehicle to evacuate the fuel tank; 3) when the vacuum hole of the fuel tank is open, using the fuel filling vehicle to evacuate the fuel tank connected to the fuel tank, and discharge the liquid fuel in the fuel tank into the fuel tank. The present invention uses the fuel filling vehicle to evacuate the depressurized fuel tank so that the fuel tank is in a negative pressure state, and then evacuates the fuel tank connected to the fuel tank to discharge the liquid fuel in the fuel tank into the fuel tank, without causing the problem of large amount of liquid fuel overflowing; the liquid fuel emergency discharge method according to the present invention is suitable for the discharge of liquid fuel in the fuel tank of underwater vehicles in abnormal situations, and is easy to operate, while also ensuring the safety of operators and products.

Description

Technical Field

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

[0002] In the prior art, the liquid fuel tank assembly of an underwater vehicle mainly includes a front gas pressurized fuel tank (referred to as the front fuel tank) and a rear fuel supply tank (rear fuel tank) separated by a partition, and an anti-swaying bulkhead is provided in the rear fuel tank, which divides the rear fuel tank into an inner chamber and an outer chamber. The anti-swaying bulkhead is arranged with a pipe that can convey gas, which is used to prevent the fuel from entraining gas into the fuel pipe in the rear fuel tank and then entering the power system when the underwater vehicle is maneuvering.

[0003] The main idea of ​​the existing liquid fuel tank assembly is: after the underwater vehicle enters the water, the outlet of the gas cylinder for pressurization installed in the liquid fuel tank assembly is opened, and the gas in the gas cylinder enters the front fuel tank after decompression to pressurize the fuel, so that the fuel enters the rear fuel tank from the front fuel tank. Specifically, the gas first enters the front fuel tank through the pressure reducer, and then the gas squeezes the liquid fuel from top to bottom and replaces the position of the liquid fuel so that the liquid fuel enters the anti-sloshing compartment. The gas squeezes the liquid fuel from top to bottom in the inner chamber of the rear fuel tank and replaces the position of the liquid fuel so that the fuel enters the fuel pipe, flows to the upper part of the outer chamber, and then moves downward from the upper part of the annular outer chamber to reach the small compartment at the bottom, and enters the power system through the valve.

[0004] This design mainly solves the demand for reliable fuel supply for light thermal-powered underwater vehicles when they are on a vertical hit trajectory, especially on the terminal trajectory. However, during actual navigation training at sea, due to various factors, the gas cylinder has pressurized the fuel tank but the underwater vehicle has not started. At this time, the discharge of fuel in the fuel tank will bring relatively large risks. The reason is that product recovery usually releases the pressure in the tank through the vent plug on the fuel tank. If the fuel consumption is very little or not (that is, the liquid fuel in the fuel tank is basically full), the pressure inside and outside the anti-sway bulkhead cannot be completely released (at this time, the gas in the anti-sway bulkhead cannot be completely discharged, so that it has a certain pressure). When the fuel tank filling hole is opened according to normal operation, a large amount of liquid fuel in the fuel tank will overflow, causing safety problems for operators and products. Summary of the invention

[0005] In order to solve the safety problem caused by fuel discharge under the above abnormal conditions, the present invention provides a liquid fuel emergency discharge method and application thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] In a first aspect, the present invention provides a method for emergency discharge of liquid fuel, comprising the following steps:

[0008] 1) Depressurize the recovered fuel tank;

[0009] 2) Use the vacuum pump in the fuel tanker to evacuate the fuel tank;

[0010] 3) With the vacuum hole of the fuel tank open, use a fuel filling vehicle to vacuum the fuel tank connected to the fuel tank and drain the liquid fuel in the fuel tank into the fuel tank.

[0011] In the present invention, since the gas cylinder has pressurized the fuel tank during the sea trial training of the underwater vehicle but the underwater vehicle has not been started, in this abnormal situation, the liquid fuel in the fuel tank is mainly concentrated in the rear fuel tank. After the fuel tank of the recovered underwater vehicle is depressurized by conventional methods, the air pressure in the fuel tank cannot be completely released due to the existence of the anti-sway bulkhead in the fuel tank. At this time, directly opening the fuel tank filling hole to recover the liquid fuel will cause a large amount of liquid fuel to suddenly overflow, causing safety problems for operators and products. Therefore, the present invention adopts the method of first evacuating the fuel tank to discharge the gas in the anti-sway bulkhead in the fuel tank, thereby releasing the pressure in the anti-sway bulkhead and the fuel tank. At this time, when the fuel tank filling hole is opened, there will be no large amount of liquid overflow.

[0012] As an optional embodiment, in step 2), the step of using a vacuum pump in the fuel filling vehicle to evacuate the fuel tank comprises the following steps:

[0013] Connect the air extraction hole 5 of the fuel filling vehicle to the vacuum extraction hole 7 of the fuel tank through a pipeline, start the fuel filling vehicle to vacuum the fuel tank to establish a negative pressure (to about -0.04MPa); then open the filling hole of the fuel tank, connect the filling hole of the fuel tank to the liquid outlet of the fuel tank through a pipeline, and close the fuel filling vehicle (i.e., stop vacuuming);

[0014] 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.

[0015] 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 provided with a gas delivery pipe to prevent the fuel from entraining gas into the fuel pipe in the rear fuel tank and thus into the power system when the underwater vehicle is maneuvering.

[0016] As an optional implementation, in step 2), the evacuating the fuel tank refers to evacuating the front fuel tank of the fuel tank.

[0017] As an optional implementation, in step 2), the fuel filling vehicle is started to evacuate the fuel tank to establish a negative pressure of -0.038 to -0.042 MPa (eg, -0.04 MPa).

[0018] As an optional implementation, the step 3) specifically includes the following steps:

[0019] Disconnect the pipeline connected to the vacuum hole of the fuel tank, connect the vacuum hole of the fuel filling vehicle to the air inlet of the fuel tank, open the vacuum hole of the fuel tank, start the fuel filling vehicle to vacuum the fuel tank, and discharge the fuel in the fuel tank into the fuel tank.

[0020] In the present invention, the negative pressure is relative to the atmospheric pressure, and the pressure lower than the atmospheric pressure is called negative pressure. The fuel tank is evacuated to make it in a negative pressure state, and in this state, when the filling hole of the fuel tank is opened, there will be no safety problem of a large amount of fuel spilling.

[0021] As an optional embodiment, in step 3), during the liquid fuel discharge process, the fuel tank is in a negative pressure state. In this negative pressure state, the liquid fuel discharge system formed by the fuel filling vehicle, the fuel tank, the fuel tank and various connecting pipes will not have the safety problem of large amount of fuel overflowing.

[0022] As an optional implementation, in step 3), in the process of starting the fuel filling vehicle to evacuate the fuel tank, the vacuum degree of the fuel tank is controlled by the regulating valve 6 of the fuel filling vehicle.

[0023] As an optional implementation, in step 3), the vacuum degree of the fuel tank is controlled by the regulating valve 6 of the fuel filling vehicle so that the pressure of the fuel tank is -0.038 to -0.042 MPa (for example, -0.04 MPa).

[0024] In a second aspect, the present invention provides an application of the above-mentioned liquid fuel emergency discharge method, which is suitable for the discharge of liquid fuel in the fuel tank of an underwater vehicle in an abnormal situation.

[0025] As an optional embodiment, the abnormal situation includes a situation where the underwater vehicle has a pressurized gas cylinder that has pressurized the fuel tank but the underwater vehicle has not started.

[0026] In the present invention, the above technical features can be freely combined to form a new technical solution without conflicting with each other.

[0027] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0028] (1) The present invention uses a fuel filling vehicle to evacuate the depressurized fuel tank, so that the fuel tank is in a negative pressure state, and then evacuates the fuel tank connected to the fuel tank to discharge the liquid fuel in the fuel tank into the fuel tank, thereby preventing safety problems caused by a large amount of liquid fuel overflowing;

[0029] (2) The liquid fuel emergency discharge method according to the present invention is suitable for the discharge of liquid fuel in the fuel tank of an underwater vehicle in abnormal situations. It is easy to operate and also well ensures the safety of operators and products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram showing the operation of evacuating a fuel tank in the liquid fuel emergency discharge method according to the present invention;

[0031] Figure 2 A schematic diagram showing the operation of draining fuel in the liquid fuel emergency draining method according to the present invention.

[0032] 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

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] A liquid fuel emergency discharge method is used for the discharge of liquid fuel in abnormal conditions of actual navigation recovery of an underwater vehicle. The fuel tank of the underwater vehicle mainly includes a front gas pressurized fuel tank and a rear fuel supply tank. An anti-swaying bulkhead is arranged in the rear fuel tank; the anti-swaying bulkhead divides the rear fuel tank into an inner chamber and an outer chamber. The anti-swaying bulkhead is arranged with a pipe for conveying gas, and the anti-swaying bulkhead is used to prevent the fuel from entraining gas into the fuel pipe in the rear fuel tank and thus into the power system when the underwater vehicle is maneuvering.

[0037] The emergency excretion method of this embodiment includes the following steps.

[0038] Step S1: After the underwater vehicle recovers the fuel tank 2, the fuel tank 2 is depressurized.

[0039] Step S2, using the vacuum pump in the fuel filling vehicle to evacuate the fuel tank 2, specifically comprising the following steps:

[0040] like Figure 1 As shown, the air extraction hole 5 of the fuel filling vehicle 1 is connected to the vacuum hole 7 of the fuel tank 2 through a pipeline, and the fuel filling vehicle 1 is started to vacuum the fuel tank 2 to establish a negative pressure of -0.04MPa; then the filling hole 8 of the fuel tank 2 is opened, 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, and the fuel filling vehicle 1 is closed (that is, the vacuum extraction is stopped). Since the fuel tank 2 is in a negative pressure state, opening the filling hole 8 of the fuel tank 2 will not cause a safety problem of a large amount of fuel overflowing.

[0041] Step S3: When the vacuum hole of the fuel tank is open, use a fuel filling vehicle to vacuum the fuel tank connected to the fuel tank, and discharge the liquid fuel in the fuel tank into the fuel tank. Specifically, the following steps are included:

[0042] like Figure 2 As shown, the pipeline connected to the vacuum hole 5 of the fuel tank 2 is disconnected, the vacuum hole 5 of the fuel filling vehicle 1 is connected to the air inlet 10 of the fuel tank 3, the vacuum hole 5 of the fuel tank 2 is opened, the fuel filling vehicle 1 is started to vacuum the fuel tank 3, the vacuum degree of the fuel tank 3 is controlled by the regulating valve 6 of the fuel filling vehicle 1, and the fuel in the fuel tank 2 is discharged into the fuel tank 3. During the liquid fuel discharge process, the fuel tank 3 is in a negative pressure state, and there will be no safety problem of a large amount of fuel overflowing.

[0043] The liquid fuel emergency 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 refill the liquid fuel to conduct the actual flight test of the underwater vehicle product. After hundreds of actual flight test recovery, the underwater vehicle product is in good use.

[0044] 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.

[0045] 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 emergency discharge of liquid fuel, characterized in that: The emergency excretion method comprises the following steps: 1) Depressurize the recovered fuel tank; 2) Use the vacuum pump in the fuel tanker to evacuate the fuel tank; 3) With the vacuum hole of the fuel tank open, use a fuel filling vehicle to vacuum the fuel tank connected to the fuel tank and drain the liquid fuel in the fuel tank into the fuel tank.

2. The method for emergency discharge of liquid fuel according to claim 1, characterized in that: In step 2), the method of using a vacuum pump in the fuel filling vehicle to evacuate the fuel tank comprises the following steps: Connect the air extraction hole of the fuel filling truck with the vacuum extraction hole of the fuel tank through a pipeline, start the fuel filling truck to vacuum the fuel tank to establish negative pressure; then open the filling hole of the fuel tank, connect the filling hole of the fuel tank with the liquid outlet of the fuel tank through a pipeline, and stop vacuum extraction.

3. The method for emergency discharge of liquid fuel according to claim 1 or 2, characterized in that: The fuel tank comprises a front gas pressurized fuel tank and a rear fuel supply tank, wherein the rear fuel tank is provided with an anti-swaying bulkhead for preventing fuel-entrained gas from entering the fuel pipe in the rear fuel supply tank and thus entering the power system when the underwater vehicle is maneuvering.

4. The method for emergency discharge of liquid fuel according to claim 3, characterized in that: In step 2), the evacuating the fuel tank refers to evacuating the front gas pressurized fuel tank of the fuel tank.

5. The method for emergency discharge of liquid fuel according to claim 2, characterized in that: In the step 2), the fuel filling vehicle is started to evacuate the fuel tank to establish a negative pressure of -0.038 to -0.042 MPa.

6. The method for emergency discharge of liquid fuel according to claim 1 or 2, characterized in that: Step 3) comprises the following steps: Disconnect the pipeline connected to the vacuum hole of the fuel tank, connect the vacuum hole of the fuel filling vehicle to the air inlet of the fuel tank, open the vacuum hole of the fuel tank, start the fuel filling vehicle to vacuum the fuel tank, and discharge the fuel in the fuel tank into the fuel tank.

7. The method for emergency discharge of liquid fuel according to claim 6, characterized in that: In the step 3), during the process of starting the fuel filling vehicle to evacuate the fuel tank, the vacuum degree of the fuel tank is controlled by the regulating valve of the fuel filling vehicle.

8. The method for emergency discharge of liquid fuel according to claim 7, characterized in that: In the step 3), the vacuum degree of the fuel tank is controlled by the regulating valve of the fuel filling vehicle so that the pressure of the fuel tank is -0.038 to -0.042 MPa.

9. An application of the liquid fuel emergency discharge method according to any one of claims 1 to 8, wherein the discharge method is suitable for discharge of liquid fuel in a fuel tank of an underwater vehicle in abnormal circumstances.

10. Application of the liquid fuel emergency discharge method according to claim 9, wherein the abnormal situation includes a situation in which the underwater vehicle has a booster gas cylinder that has pressurized the fuel tank but the underwater vehicle has not started.

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