CN115353061B

CN115353061B - Pressure relief protection system of aircraft ground oil filling pipeline

Info

Publication number: CN115353061B
Application number: CN202211295216.6A
Authority: CN
Inventors: 朱宏刚; 苏军; 扶军; 肖亮; 邓应杰
Original assignee: Chengdu Branch Of China Aviation Fuel Co ltd
Current assignee: Chengdu Branch Of China Aviation Fuel Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-01-17
Anticipated expiration: 2042-10-21
Also published as: CN115353061A

Abstract

The invention discloses a pressure relief protection system of an aircraft ground oil filling pipeline, which is arranged on an aircraft oil filling pipeline and used for relieving pressure and recovering oil at an oil filling end pipe fitting, wherein the oil filling pipeline comprises an oil filling hard pipe and an oil filling hose, a valve is arranged on the oil filling hard pipe, the oil filling hard pipe comprises a pressure relief pipeline which is communicated with a pipe body part from the valve to the end part of the oil filling hose, and the oil is guided into a recovery oil tank arranged by the pressure relief pipeline; the device also comprises a placement mechanism matched with the refueling joint at the end part of the refueling hose, wherein the placement mechanism is provided with a detection module, and the detection end part of the detection module faces to the occupied area of the refueling joint placed on the placement mechanism; the detection module is connected with the control module, when the oiling joint is connected with/disconnected from the placing mechanism, the detection module sends a change signal to the control module, and the control module controls the electromagnetic valve arranged on the pressure relief pipeline to be opened/closed according to the change signal.

Description

Pressure relief protection system of aircraft ground oil filling pipeline

Technical Field

The invention belongs to the technical field of aircraft refueling equipment, and particularly relates to a pressure relief protection system for an aircraft ground refueling pipeline.

Background

The airplane refueling is an activity of refueling the airplane by using refueling equipment/facilities, so that the airplane is timely, quickly, efficiently and reliably refueled, and the refueling device/facility has important significance for improving the rapid take-off and landing operation of the airplane.

The modes of refueling an aircraft include both air and ground, whereas a civil aircraft generally refuels on the ground, i.e. in a landing airport the aircraft is refueled by ground crews according to a plan. The method for filling aviation fuel oil on the ground comprises two modes, namely gravity refueling and pressure refueling, and because the gravity refueling efficiency is low and the conditions are harsh, the conventional refueling mode adopts external equipment for assisting pressure refueling.

Pressure refueling refers to a method of pressurizing and filling fuel oil into an aircraft through a centralized refueling nozzle at the lower part of the aircraft, and in order to achieve high refueling efficiency, a large pressure is usually added, so that the requirements on pipe fittings during refueling are different from those of other fuel consumption equipment.

When the oil is filled, the oil filling joint is connected with an oil filling pipe of an oil filling vehicle or an oil filling ground station, the oil filling main pipe body conveys the fuel oil coming from the oil filling joint to the oil filling shutoff valve, and the oil filling valve controls the fuel oil to flow to the oil tank. The refueling process has the automatic control and the manual control, refuels check valve can make when changing refueling joint and house steward need take out the oil tank fuel occasionally, and the fuel of jettison nipple can take the fuel of every oil tank to refuel the house steward and be used for the cluster oil or the jettison.

When the ground station is generally adopted for refueling, the refueling pipeline is directly connected with the oil pump, and aviation fuel in the ground well is pumped out through the oil pump and is pressurized to be output outwards. And the tail end of the oiling pipeline is a soft rubber pipe, so that the rubber pipe has certain length in order to facilitate operation, and the length can be conveniently adjusted to meet the oiling requirements of different positions. When fuel is filled, the fuel in the pipeline moves at a high speed and has larger pressure, and the hose part during fuel filling is generally in a low bending state, namely has smaller bending amplitude, so that the phenomenon that the excessive bending of the hose part causes the larger pressure of the fuel in the hose part to impact and damage the extending bending part of the hose part is avoided. However, when the refueling is completed, a certain distance is reserved between the valve and the hose on the ground refueling line, and a certain amount of fuel is still kept in the refueling hose after the valve is closed. This part fuel is still keeping the pressure when refueling, if directly keep higher internal pressure with the hose bending this moment under outdoor environment for a long time, thereby can lead to refueling the hose and take place to damage and the oil spilling oil leak, serious potential safety hazard may appear.

When refueling is completed, fuel oil with high pressure in the refueling pipeline needs to be decompressed after a valve of the refueling pipeline is closed, and the fuel oil is prevented from being retained in the hose for a long time to damage the hose. The problem of general artifical pressure release process can be because of the problem of management or other people are for therefore neglected, and the automatic pressure release pipeline that is provided with can solve corresponding problem, avoids the people to forget the pressure release flow and leads to the pipe fitting to damage.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a pressure relief protection system for an airplane ground oil filling pipeline, which enables an oil filling operator to automatically discharge and recover fuel oil with certain pressure in an oil filling hose after placing an oil filling joint in place through automatic linkage equipment.

The technical scheme adopted by the invention is as follows:

in a first aspect, the invention provides a pressure relief protection system for an aircraft ground refueling pipeline, which is arranged on an aircraft refueling pipeline and is used for relieving pressure and recovering oil for a pipe fitting at the refueling end, wherein the refueling pipeline comprises a refueling hard pipe and a refueling hose, a valve is arranged on the refueling hard pipe and comprises a pressure relief pipeline communicated with a pipe body part from the valve to the end part of the refueling hose, and the pressure relief pipeline guides the oil into a recovery oil tank;

the device also comprises a placing mechanism matched with the refueling joint at the end part of the refueling hose, wherein the placing mechanism is provided with a detection module, and the detection end part of the detection module faces to the occupied area of the refueling joint placed on the placing mechanism;

the detection module is connected with the control module, when the oiling joint is connected with/disconnected from the placing mechanism, the detection module sends a change signal to the control module, and the control module controls the electromagnetic valve arranged on the pressure relief pipeline to be opened/closed according to the change signal.

In combination with the first aspect, the present invention provides a first implementation manner of the first aspect, wherein the pressure relief pipeline includes a pressure relief secondary pipe and a pressure relief branch pipe, the pressure relief secondary pipe introduces oil with pressure into the pressure relief branch pipe, the electromagnetic valve is disposed on the pressure relief branch pipe, and a safety valve is further disposed on the pressure relief branch pipe provided with the electromagnetic valve.

With reference to the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, which includes two pressure relief branches connected in parallel, wherein the first pressure relief branch is provided with an electromagnetic valve and a safety valve, and the other second pressure relief branch is provided with an automatic return valve and a pressure relief ball valve 7;

the first pressure relief branch pipe is automatically cut off when the pressure of oil entering the recovery oil tank is smaller than the first pressure threshold value;

setting a second pressure threshold value for an automatic return valve on a second pressure relief branch pipe, and when the pressure value in the recovery oil tank exceeds the second pressure threshold value, opening the automatic return valve to guide oil in the recovery oil tank back to the oil filling pipeline;

and a pressure sensor is arranged on the pressure relief secondary pipe, a third pressure threshold is set for the pressure sensor on the pressure relief secondary pipe, and when the pressure in the pressure relief secondary pipe is higher than the third pressure threshold, the control module controls the pressure relief ball valve 7 to be kept closed.

It should be noted that, unlike other oil filling pipelines, the oil filling system of the present invention only fills oil for medium and large aircraft, is disposed at the oil filling island, generally connects to the underground oil depot of the oil filling island, and pumps the oil through the pressurized pump station of the oil filling island itself, whereas the oil filling pipeline involved in the present invention is only a part of pipe transportation equipment existing on the ground. In the present a great deal of oil filling pipelines, because all adopt the pressure oiling mode, then all can retrieve the fluid in the pipeline to the storage tank when accomplishing to refuel, avoid continuously keeping in the pipeline and have great oil pressure. However, the partial ground refueling pipelines for the aircraft are controlled to be closed by the main ball valve on the ground after refueling is completed, oil in the main pipelines can be recycled to the oil tank, but the oil in the partial refueling pipelines between the main ball valve and the refueling joint cannot be recycled timely or directly, the quantity of the oil is small, the oil can be temporarily stored in a pressure relief mode only through the recycling oil tank, and the oil in the sealed recycling oil tank can be transferred to a corresponding place for disposal in an inspection period.

The possibility that recovered oil needs to be returned due to overlarge pressure does not exist in the prior art, and particularly, a part of refueling equipment can cause deviation of equipment for detecting single refueling volume pricing once the oil is returned. In the pressure relief recovery system, due to the structural particularity of the large and long oil filling hose, large impact pressure can occur at the beginning of pressure relief, after a certain pressure relief time, the pressure of the oil filling pipeline is reduced after the oil pressure in the oil filling pipeline is balanced, and the situation that the oil pressure in the oil filling pipeline is lower than that of a recovery oil tank can possibly exist. Only when the pressure in the recovery oil tank is greater than the set second pressure threshold and the oil pressure in the pressure relief auxiliary pipe is higher than the third pressure threshold, the whole system can send out a warning to indicate that an operator or a manager should transfer the oil in the recovery oil tank in time.

With reference to the first implementation manner of the first aspect, the present invention provides a third implementation manner of the first aspect, wherein the pressure relief pipeline further includes a leakage oil pipe disposed between the refueling hard pipe and the refueling hose through a flange, and a lower portion of the leakage oil pipe is communicated with the pressure relief secondary pipe.

With reference to the third embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein a pressure relief ball valve 7 is arranged on the pressure relief secondary pipe.

In combination with the first embodiment of the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the refueling hard pipe comprises at least two main fuel inlet pipes connected in parallel, and each main fuel inlet pipe is connected with a refueling hose.

With reference to the first aspect or the first to fifth implementation manners of the first aspect, the present invention provides a sixth implementation manner of the first aspect, wherein the placing mechanism includes a fixed frame disposed on the same fixed surface as the oil filling pipeline, a hanging frame is disposed on the fixed frame, and the oil filling joint is placed on the hanging frame and is within the detection range of the detection module.

In combination with the sixth implementation manner of the first aspect, the present invention provides a seventh implementation manner of the first aspect, wherein the hanging rack is movably connected with a fixed rack, the hanging rack is linked with the detection module, and when the refueling joint is placed on the hanging rack, the action of the hanging rack causes the detection module to receive a signal.

With reference to the sixth implementation manner of the first aspect, the invention provides an eighth implementation manner of the first aspect, wherein the hanging bracket is a placing groove which is rotatably connected with the fixed bracket through a rotating bracket, the placing groove is used for accommodating the insertion of an operation handle of the refueling adapter, and the operation handle enters the detection range of a detection module arranged at the lower part of the placing groove after being inserted.

With reference to the eighth implementation manner of the first aspect, the present invention provides a ninth implementation manner of the first aspect, wherein the detection module is a proximity switch, and the proximity switch is disposed on an outer wall of the placement slot and the detection end of the proximity switch penetrates into the placement slot.

The invention has the beneficial effects that:

(1) According to the invention, through the arrangement of the pressure relief pipeline and the matching of the detection module on the placing mechanism, an automatic pressure relief process can be started when an oiling operator places an oiling joint on the placing mechanism for mounting after oiling, and oil with certain pressure in an oiling hose is transferred into a recovery oil tank, so that the oil pressure in the oiling hose can be automatically and rapidly reduced, and meanwhile, part of fuel oil is recovered and then treated, so that the situation that the fuel oil stays in the pipeline for a long time to influence the oiling quality is avoided;

(2) According to the invention, the oil is conducted and refluxed through a plurality of pressure relief auxiliary pipes and different valve structures, so that automatic and efficient oil drainage management is realized;

(3) The special structure on the refueling joint can be used for fixing through the special fixing frame and the mounting mechanism for placing the refueling joint, and meanwhile, the position of the refueling joint is detected and sent to the control module as a switch signal to start the pressure relief process.

Drawings

FIG. 1 is a top view of the piping for the overall system of the present invention;

FIG. 2 is a side view of the piping for the overall system of the present invention;

FIG. 3 is a front view of the piping for the overall system of the present invention;

FIG. 4 is an isometric view of the piping for the overall system of the present invention;

FIG. 5 is a first isometric view of the entire hang tag carrier of the present invention;

FIG. 6 is a front view of the overall hanger bracket of the present invention;

FIG. 7 is a second perspective view of the entire suspend platform of the present invention;

fig. 8 is a partially enlarged view of a in fig. 3 according to the present invention.

In the figure: 1-main oil inlet pipe, 2-main ball valve, 3-drainage oil pipe, 4-oil filling joint, 5-explosion-proof electric box, 6-drainage auxiliary pipe, 7-drainage ball valve, 8-automatic return valve, 9-electromagnetic valve, 10-safety valve, 11-recovery oil tank, 12-oil discharge pump, 13-placing groove, 14-fixing frame, 15-proximity switch, 16-operating handle and 17-rotating bracket.

Detailed Description

The invention is further explained below with reference to the drawings and the specific embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the embodiment discloses a pressure relief protection system of an aircraft ground oil filling pipeline, as shown in fig. 1-8, the pressure relief protection system is arranged on an aircraft oil filling pipeline and used for relieving pressure and recovering oil at an oil filling end pipe fitting, wherein the oil filling pipeline comprises an oil filling hard pipe and an oil filling hose, a valve is arranged on the oil filling hard pipe and comprises a pressure relief pipeline communicated with a pipe body part from the valve to the end part of the oil filling hose, and the oil is guided into a recovery oil tank 11 arranged by the pressure relief pipeline; the device also comprises a placement mechanism matched with the refueling joint 4 at the end part of the refueling hose, wherein the placement mechanism is provided with a detection module, and the detection end part of the detection module faces to the occupied area of the refueling joint 4 placed on the placement mechanism;

the detection module is connected with the control module, when the oil filling connector 4 is connected with/disconnected from the placing mechanism, the detection module sends a change signal to the control module, and the control module controls the electromagnetic valve 9 arranged on the pressure relief pipeline to be opened/closed according to the change signal.

When refueling the completion, operating personnel can close the main ball valve 2 who adds the oil pipe way, and the main ball valve 2 that demonstrates in the picture is manual ball valve equipment, generally can adopt the structure of electromagnetism ball valve in this embodiment, carries out the automatic control switching through control module. The filler neck 4 is then removed and placed on the placement mechanism to initiate the venting process. And the operator can set the inspection period on duty schedule, and the inspection period can be adjusted according to the number of times of refueling every day. In each inspection cycle, the operator periodically transfers the oil in the recovery tank 11 and discharges the oil through the drain pump 12 provided at the lower portion of the recovery tank 11.

Wherein, the pressure release pipeline includes pressure release auxiliary pipe 6 and pressure release branch pipe, on the fluid that will have pressure by pressure release auxiliary pipe 6 introduces the pressure release branch pipe, solenoid valve 9 sets up on the pressure release branch pipe to still be equipped with relief valve 10 on the pressure release branch pipe that is equipped with solenoid valve 9. A first pressure threshold value is set for a safety valve 10 of the first pressure relief branch pipe, and the first pressure relief branch pipe is automatically cut off when the pressure of oil entering a recovery oil tank 11 is smaller than the first pressure threshold value; a second pressure threshold value is set for the automatic return valve 8 on the second pressure relief branch pipe, and when the pressure value in the recovery oil tank 11 exceeds the second pressure threshold value, the automatic return valve 8 is opened to guide the oil in the recovery oil tank 11 back to the oil filling pipeline; and a pressure sensor is arranged on the auxiliary pressure relief pipe 6, a third pressure threshold is set for the pressure sensor on the auxiliary pressure relief pipe 6, and when the pressure in the auxiliary pressure relief pipe 6 is higher than the third pressure threshold, the control module controls the pressure relief ball valve 7 to be kept closed.

The embodiment provides an implementation mode, that is, the implementation mode comprises two pressure relief branch pipes connected in parallel, wherein a solenoid valve 9 and a safety valve 10 are arranged on a first pressure relief branch pipe, and an automatic return valve 8 and a pressure relief ball valve 7 are arranged on the other second pressure relief branch pipe. The pressure relief pipeline further comprises a leakage flow oil pipe 3 arranged between the refueling hard pipe and the refueling hose through a flange, and the lower part of the leakage flow oil pipe 3 is communicated with the pressure relief auxiliary pipe 6. The pressure relief auxiliary pipe 6 is provided with a pressure relief ball valve 7. Wherein, first pressure release branch pipe is as the main pipeline that gets into recovery oil tank 11, and the entering of oil can be controlled to its solenoid valve 9 that is equipped with, and the pressure value of the fluid that the while relief valve 10 can guarantee to get into, and the oil pressure threshold value can be set for in the in-service use, minimum pressure value in the oil filling pipeline promptly, if be less than this pressure value, judge the safety range, need not to retrieve in the oil tank 11 with the leading-in of fluid.

When finishing the single and refuelling, refuel the intraductal pressure value of hose and all be higher than the safe pressure value of settlement, cause relief valve 10 can be in the open mode under the solenoid valve 9 open mode with root pressure release branch pipe, make in leading-in recovery oil tank 11 of fluid that comes from refuelling the hose.

And the second pressure release branch pipe makes its direction of conduction opposite with first pressure release branch pipe through the automation that is equipped with back to valve 8, its purpose is used for leading back to refuel the hose with the fluid in the recovery oil tank 11 that sudden oil pressure sharply increases and surpass the limit value, should return automatically to valve 8 different with relief valve 10, it switches on the condition and exists positive oil pressure difference between recovery oil tank 11 end and the vice pipe 6 end of pressure release, and when this oil pressure difference is greater than the threshold value of settlement, close the solenoid valve 9 of first pressure release branch pipe by control module control, open the solenoid valve 9 of second pressure release branch pipe, fluid in recovery oil tank 11 lets out and flows back into the vice pipe 6 of pressure release from the second pressure release branch pipe. The pressure relief auxiliary pipe 6 is communicated with the refueling hose, and then returned oil can enter the refueling hose, so that potential safety hazards caused by overlarge oil pressure of the recovery oil tank 11 are avoided.

It should be noted that, unlike a conventional fuel filler line, a fuel filler line with a long fuel filler hose, especially a line with a large flow rate and oil pressure for refueling aircraft equipment, has a large impact during pressure relief, and oil with residual pressure in the fuel filler hose can rapidly enter the pressure relief secondary pipe 6. The pressure relief system in this embodiment is an automatic pressure relief mode, and the system controls the opening and closing of the pipeline according to the position of the refueling joint 4 after refueling. The recovery tank 11 has a maximum receiving capacity in the checking period, and the oil in the recovery tank 11 is led out of the recovery process once in each checking period. If the recovery tank 11 is already close to saturation level in each inspection cycle, the oil level may exceed the set threshold value due to the next oil unloading process, so that the pressure in the recovery tank 11 may increase.

In fig. 4, it can be seen that the connection of the pressure relief secondary pipe 6 is not provided on the filler hose, but on the filler pipe close to the main ball valve 2, in order to ensure connection stability and pressure relief efficiency as much as possible. During pressure relief, because the oil pressure of refueling at every time is large, oil can quickly enter the recovery oil tank 11 through the first pressure relief branch pipe after the pressure relief electromagnetic valve 9 is opened. The fluid that is in at this moment refuels in the hard tube can flow out rapidly, and the pressure that is in the outside part of ball valve 2 refuels in hard tube and the hose that refuels can reduce, and the fluid volume can reduce rapidly. At this time, there is a case where the initial oil pressure is too high and the oil rapidly flows into the recovery oil tank 11 and then the recovery oil tank 11 is filled with the oil, and the internal pressure of the recovery oil tank 11 is increased. Can be provided with the communicating valve among the recovery oil tank 11 and switch on inside air, the fluid in the recovery oil tank 11 of being convenient for can freely pass in and out, if the pressure in the recovery oil tank 11 surpasss behind the pressure threshold value, this communicating valve probably is destroyed and leads to fluid to reveal, needs control module this moment to close solenoid valve 9 and restricts high-pressure fluid and assaults. At this moment, because the fluid in the outside refueling hose reaches pressure balance after the pressure release, the fluid that leads to fast pressure release flows out in a large number, adds the pressure in the oil pipe way and has reduced, then returns toward valve 8 through the automation that is equipped with and can flow back a certain amount of fluid in retrieving oil tank 11 to adding the oil pipe way, avoids too big fluid to cause the damage of retrieving oil tank 11.

The oil filling hard tube comprises at least two main oil inlet tubes 1 which are connected in parallel, and each main oil inlet tube 1 is connected with an oil filling hose.

The placing mechanism comprises a fixing frame 14 arranged on the same fixing surface with an oil filling pipeline, a hanging frame is arranged on the fixing frame 14, and the oil filling connector 4 is placed on the hanging frame and is located in the detection range of the detection module. The hanging frame is movably connected with the fixing frame 14 and is linked with the detection module, and when the refueling joint 4 is placed on the hanging frame, the action of the hanging frame causes the detection module to receive signals.

The hanging bracket is a placing groove 13 which is rotatably connected with the fixed bracket 14 through a rotating bracket 17, the placing groove 13 is used for accommodating the insertion of an operating handle 16 of the refueling adapter 4, and the operating handle 16 enters the detection range of a detection module arranged at the lower part of the placing groove 13 after being inserted.

The detection module is a proximity switch 15, the proximity switch 15 is arranged on the outer wall of the placing groove 13, and the end part of the detection end of the proximity switch penetrates into the placing groove 13.

The embodiment also provides a hanging frame for a refueling joint 4 of a ground refueling pipeline of an aircraft, which is used for placing a refueling pipe fitting of the aircraft, and comprises a fixed frame 14 arranged on the same fixed surface with the refueling pipe fitting, wherein the fixed frame 14 is provided with a plurality of hanging positions, and the end structure of the refueling pipe fitting is placed on the hanging positions; the mounting position is provided with a detection module corresponding to the end structure of the oil filling pipe, and the end structure of the oil filling pipe enters the detection area when being positioned at the mounting position and is overlapped with the part of the end structure at the mounting position.

The fixed frame 14 is provided with a mounting frame movably connected with the fixed frame 14, the refueling pipe fitting comprises a refueling hard pipe and a refueling hose, and the end part structure is a refueling joint 4 arranged at the end part of the refueling hose; when fixed, the refueling joint 4 is vertically hung on a hanging frame.

The hanging frame is provided with a snap ring with a notch, the inner diameter of the snap ring is smaller than the maximum outer diameter of the oil filling connector 4, and the oil filling connector 4 is clamped in the snap ring to realize hanging when being fixed. The hanging rack comprises a rotating support 17 fixedly connected with the fixed rack 14, one end of the rotating support 17 extends outwards, a rotary table is arranged at the end part of the rotating support 17, a clamping ring is connected with the rotary table, and the clamping ring is detachably connected with the oiling joint 4; the detection module is a rotary switch or an angular velocity sensor arranged in the turntable.

The hanging rack comprises a rotating bracket 17 fixedly connected with the fixed rack 14, one end of the rotating bracket 17 extends outwards, a turntable is arranged at the end part of the rotating bracket 17, and a placing groove 13 is connected through the turntable; the placement groove 13 has a through passage for receiving an operating handle 16 provided on the filler neck 4; the detection module is a proximity switch 15 or a distance sensor provided on the placement slot 13.

The top of the placing groove 13 is a flat opening, the lower part of the placing groove is an inclined opening, the proximity switch 15 or the distance sensor is arranged on the outer wall of the inclined opening, and the detection end part of the proximity switch penetrates into the placing groove 13 and faces to the outer side of the inclined opening.

In another embodiment, the mounting rack comprises a rotating bracket 17 fixedly connected with the fixed rack 14, one end of the rotating bracket 17 extends outwards and is provided with a rotating disc at the end part, and a placing groove 13 used for accommodating an operating handle 16 of the refueling adapter 4 is connected with the rotating disc; the placing groove 13 is provided with an inner bottom, and the operating handle 16 abuts against the surface of an elastic plate arranged on the inner bottom when inserted; the detection module is a pressure switch or a pressure sensor arranged on the inner side of the elastic plate.

The fixing frame 14 is provided with a base and a top frame, the top frame is provided with an explosion-proof electric box 5, and the detection module is connected with the explosion-proof electric box 5 through a cable. Be equipped with the pressure sensor who is connected with explosion-proof electronic box 5 on the fuel filler neck 4, be equipped with the display screen and the audio-optical feedback structure of the oil pressure information in the feedback fuel filler neck 4 on the explosion-proof electronic box 5.

In the embodiment, the refueling joint 4 is placed through the special placing mechanism, so that the structure damage caused by the random placement of the overweight refueling joint 4 can be avoided, meanwhile, the refueling joint can be hung at a certain height through the movably connected hanging frame structure, and the refueling hose moves towards the direction of reducing the bending amplitude due to the influence of the elastic force generated by the bending of the overlong refueling hose, so that the structural strength of the refueling hose is prevented from being influenced by the long-time over-bending of the refueling hose due to the fixed hanging mode; meanwhile, the detection module arranged in the embodiment is used for detecting whether the refueling joint 4 is placed in place or not and feeding back the information to the oil drainage pipeline control module for automatic pressure relief operation, so that the steps of manual operation are reduced, and the problem of omission caused by human negligence is avoided.

The explosion-proof electronic box 5 loaded with the control module is arranged on the fixing frame 14 and is matched with the pressure sensor and the acousto-optic feedback structure to prompt an oil filler whether to finish oil drainage operation or not, and the effect of prompting the operator to carry out manual pressure relief can be achieved when no automatic pressure relief pipeline exists.

It should be noted that the fuel filler neck 4 configuration of the present embodiment shows the lever 16 on only one side thereof, and the fuel filler neck 4 itself has two symmetrically disposed rotatable levers 16 for controlling the connection to the aircraft fuel filler port. However, in the present embodiment, the structure of the filler neck 4 is not limited, and only the way of placing the filler neck 4 and the mounting bracket is described, and only one of the levers 16 is shown in the drawing, and it is not limited which lever 16 is connected to the mounting bracket in actual use.

In another embodiment, as can be seen in fig. 8, the placement groove 13 is a cylindrical structure with an inner length slightly less than the length of the operating handle 16. The placement groove 13 has an insertion opening in the longitudinal direction, and the operation lever 16 is inserted from the insertion opening until the connection point of the operation lever 16 and the filler neck 4 abuts against the edge of the insertion opening of the placement groove 13 to be fixed. The placing groove 13 is rotatably connected with the fixed frame 14 through the rotating bracket 17, and the connection position of the placing groove is positioned at the insertion opening of the placing groove 13, so that the placing groove 13 keeps a vertical placing mode along with the action of gravity in a natural state. When the filler neck 4 needs to be placed on the mount 14, the operator inserts the operating levers 16 on either side in alignment with the insertion openings of the placement groove 13 so that the filler neck 4 can be placed at the placement groove 13. Because the flexible pipe that refuels 4 rear sides has certain length, refuels when refuelling joint 4 places the flexible pipe and then has the part to drag and place subaerial, can give 4 deflection forces of refuelling joint this moment, causes refuelling joint 4 to drive standing groove 13 and rotates certain angle to avoid leading to pipeline or refuelling joint 4 impaired because of the stress that refuelling hose lasts.

In this embodiment, the bottom of the placing groove 13 is further provided with an opening, and one side of the opening is provided with a wedge-shaped notch. The cut-out is chamfered from the outside to the inside in the axial direction of the placement groove 13 and is on the outside with respect to the holder 14, for the operator to see. When the operation handle 16 is inserted into the placement groove 13, the operation handle 16 can be exposed from the cut of the bottom in a normal state due to the proper length of the placement groove 13. In order to avoid that the stress of the refueling hose itself affects the placement of the refueling adapter 4, especially when the operator is not aware of the placement, the bending stress of the refueling hose may slowly push the refueling adapter 4 out by a portion as the placement groove 13 deflects, and the bottom pressure detection triggering in the above embodiment may close the solenoid valve 9 to terminate the pressure relief process when the pressure relief is not completed due to the release of the operating handle 16 from contact. In the present embodiment, the operator is required to check whether the operation handle 16 exists from the incision when placing the touch switch according to the arrangement of the incision and the manner of the access opening arranged near the incision, and even if the operation handle 16 is pushed out partially upwards when external force is lost, the detection range of the touch switch is not affected.

And because the proximity switch 15 is fixed on the upper part of the placing groove 13 through screw threads, the port of the proximity switch penetrates into the placing groove 13 to detect the inserted operating handle 16, even if the placing groove 13 deflects, the detection effect can be ensured. Meanwhile, in order to limit the deflection of the placing chute 13, the relative deflection angle range between the rotations can be limited, generally within ± 45 °, by providing a stopper at the rotation bracket 17.

Meanwhile, in the scheme not shown in the figure, the rotating support can be arranged in a ball seat and ball pin connecting mode, and the rotating support has a larger space rotating angle.

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims

1. The utility model provides an aircraft ground adds pressure release protection system of oil pipe way sets up and carries out the pressure release to refueling terminal pipe fitting and retrieve the oil on the aircraft adds oil pipe way, wherein adds oil pipe way and has valve, its characterized in that including refueling the hard tube with refuel the hose on refueling the hard tube: the oil recovery device comprises a pressure relief pipeline communicated with a pipe body part from a valve to the end part of an oil filling hose, and oil is guided into a recovery oil tank (11) by the pressure relief pipeline;

the device also comprises a placement mechanism matched with the refueling joint (4) at the end part of the refueling hose, wherein the placement mechanism is provided with a detection module, and the detection end part of the detection module faces to the occupied area of the refueling joint (4) placed on the placement mechanism;

the detection module is connected with the control module, when the refueling joint (4) is connected with the placing mechanism, the detection module sends a change signal to the control module, and the control module controls an electromagnetic valve (9) arranged on the pressure relief pipeline to be opened according to the change signal; when the oil filling connector (4) is separated from the placing mechanism, the control module controls an electromagnetic valve (9) arranged on the pressure relief pipeline to be closed according to the change signal;

the pressure relief pipeline comprises a pressure relief auxiliary pipe (6) and a pressure relief branch pipe, oil with pressure is introduced to the pressure relief branch pipe through the pressure relief auxiliary pipe, the electromagnetic valve (9) is arranged on the pressure relief branch pipe, and a safety valve (10) is further arranged on the pressure relief branch pipe provided with the electromagnetic valve (9);

the automatic pressure relief valve also comprises two pressure relief branch pipes connected in parallel, wherein the first pressure relief branch pipe is provided with an electromagnetic valve (9) and a safety valve (10), and the other second pressure relief branch pipe is provided with an automatic return valve (8) and a pressure relief ball valve (7);

the first pressure relief branch pipe is automatically cut off when the pressure of oil entering a recovery oil tank (11) is smaller than the first pressure threshold value;

a second pressure threshold value is set for the automatic return valve (8) on the second pressure relief branch pipe, and when the pressure value in the recovery oil tank (11) exceeds the second pressure threshold value, the automatic return valve (8) is opened to guide the oil in the recovery oil tank (11) back to the oil filling pipeline;

and a pressure sensor is arranged on the pressure relief auxiliary pipe (6), a third pressure threshold value is set for the pressure sensor on the pressure relief auxiliary pipe (6), and when the pressure in the pressure relief auxiliary pipe (6) is higher than the third pressure threshold value, the control module controls the pressure relief ball valve (7) to be kept closed.

2. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 1, wherein: the pressure relief pipeline further comprises a leakage flow oil pipe (3) arranged between the refueling hard pipe and the refueling hose through a flange, and the lower part of the leakage flow oil pipe (3) is communicated with the pressure relief auxiliary pipe (6).

3. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 2, wherein: and a pressure relief ball valve (7) is arranged on the pressure relief auxiliary pipe (6).

4. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 1, wherein: the oiling hard tube comprises at least two main oil inlet tubes (1) which are connected in parallel, and each main oil inlet tube (1) is connected with an oiling hose.

5. An aircraft ground refueling pipeline pressure relief protection system according to any one of claims 1 to 4 wherein: the oil filling mechanism is characterized in that the placing mechanism comprises a fixing frame (14) arranged on the same fixing surface with an oil filling pipeline, a hanging frame is arranged on the fixing frame (14), and the oil filling connector (4) is placed on the hanging frame and is located in the detection range of the detection module.

6. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 5, wherein: the hanging frame is movably connected with the fixing frame (14), the hanging frame is linked with the detection module, and when the oiling joint (4) is placed on the hanging frame, the action of the hanging frame causes the detection module to receive signals.

7. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 5, wherein: the hanging frame is a placing groove (13) which is rotatably connected with the fixed frame (14) through a rotating support (17), the placing groove (13) is used for accommodating an operation handle (16) of the oiling joint (4) to be inserted, and after the operation handle (16) is inserted, the operation handle enters the detection range of a detection module arranged at the lower part of the placing groove.

8. An aircraft ground refueling pipeline pressure relief protection system as claimed in claim 7, wherein: the detection module is a proximity switch (15), the proximity switch (15) is arranged on the outer wall of the placing groove (13), and the end part of the detection end of the proximity switch penetrates into the placing groove (13).