CN108146643B

CN108146643B - Manufacturing method of small oil tank suitable for large diving angle

Info

Publication number: CN108146643B
Application number: CN201611111502.7A
Authority: CN
Inventors: 殷贵刚; 石端; 张雷; 王晓明; 田平; 左小红
Original assignee: Chengdu Kaidi Precision Technology Co ltd
Current assignee: Chengdu Kaidi Precision Technology Co ltd
Priority date: 2016-12-06
Filing date: 2016-12-06
Publication date: 2020-12-29
Anticipated expiration: 2036-12-06
Also published as: CN108146643A

Abstract

The invention belongs to the field of aviation, and particularly relates to a manufacturing method of a small oil tank suitable for a large diving angle. According to the structure characteristics and the manufacturing difficulty of the small oil tank, smooth oil supply of the oil tank in various flight attitude states is guaranteed, the inverted convex structure of the end face of the oil tank and the small oil tank oil separation plate with the back inclination angle of 10 degrees are ingeniously designed, and the 30Min non-stop oil supply of an airplane in a large diving angle (not more than 60 degrees) state is guaranteed; the use of a small oil suction and ventilation nozzle and a spherical oil hammer meets the oil supply requirements of the airplane in various flight postures such as climbing, rolling, diving and the like; oil-proof impact sponge is filled in the hollow cavity, so that oil liquid can not generate large oil liquid impact under various large overload postures, and the gravity center of the airplane can not be greatly changed; the oil tank base body is made of composite materials, so that the weight of the oil tank is reduced, the defect that the traditional oil tank is made of aluminum alloy in a welding manufacturing process is overcome, the oil tank is lighter and lower in cost under the condition of the same oil capacity.

Description

Manufacturing method of small oil tank suitable for large diving angle

Technical Field

The invention belongs to the field of aviation, and particularly relates to a method for manufacturing a small oil tank adaptive to a large depression angle, which is characterized in that an oil separation plate of the small oil tank with an end face inverted-convex structure and a back inclination angle of 10 degrees is designed, so that an airplane can be supplied with oil 30Min without stopping under the state of the large depression angle (not more than 60 degrees); the hollow filled oil-proof impact sponge prevents the fuel oil of the airplane from generating large oil impact under various large overload postures, so that the gravity center of the airplane does not change greatly.

Background

With the rapid development of small unmanned aircrafts, the requirements on the flight distance and the flight height of the aircrafts are higher and higher. The battery-driven small unmanned aircraft has limited range and endurance time, so that the range and endurance time are increased by times after the aircraft is driven by an oil engine instead of a motor, and the high-power gasoline engine also increases the effective load of the aircraft. For realizing the electric drive to change the oil drive, wherein just require the oil tank of utensil oil storage function, traditional aircraft oil tank adopts aluminum alloy welding to make mostly, but unmanned aerial vehicle's oil tank has its special requirement: the same oil capacity requires lighter oil tank, low cost, no shutdown for oil supply 30Min under the condition of large depression angle (not more than 60 degrees), and no large impact shock is generated by the oil liquid under the condition of large overload. The oil tank structure with the composite material as the matrix is required to be realized, the oil tank structure is provided with a small oil suction and ventilation nozzle, the oil separation plate which ensures the relatively stable oil in the small oil tank is ensured, and the oil tank hollow filling sponge which prevents the oil from generating large impact under the large flight attitude is provided.

Disclosure of Invention

Objects of the invention

The manufacturing method of the small oil tank with the inverted-convex structure is realized, the oil tank can meet the small oil tank oil separation plate with the back inclination angle of 10 degrees, and the 30Min oil supply of the airplane is not stopped under the state of a large diving angle (not more than 60 degrees); the hollow filled oil-proof impact sponge meets the requirement that the aircraft is not likely to generate large oil impact under various large overload postures, and the gravity center of the aircraft is not greatly changed.

Technical scheme

A method for manufacturing a small oil tank adapting to a large depression angle is characterized by comprising the following steps:

the method comprises the following steps: designing a composite material mold of the oil tank shell according to the theoretical appearance of the oil tank;

step two: laying an upper shell of the oil tank according to the theoretical female die profile of the upper shell die of the oil tank;

step three: laying the lower shell of the oil tank according to the theoretical female die profile of the lower shell die of the oil tank;

step four: bonding the short side check blocks 21 on the left side and the right side of the lower shell of the oil tank by using epoxy resin, and leaving half of the short side check blocks exposed in the width direction;

step five: bonding the long side check blocks 22 on the front side and the rear side of the lower shell of the oil tank by using epoxy resin, and leaving half of the long check blocks exposed in the width direction;

step six: bonding the small oil tank stop block 23 to the inverted convex-shaped concave pit opening by using epoxy resin, keeping an inclination angle of 10 degrees (the end of the semicircular hole is declined) with the bottom plane of the oil tank, and firmly bonding and sealing the outer periphery of the semicircular hole with the side wall of the oil tank;

step seven: inserting the oil nozzle suite 5 into a corresponding hole of the upper shell 1 of the oil tank, and firmly gluing the oil nozzle suite to be sealed;

step eight: the oil pipe 6 is sleeved into the corresponding oil suction nozzle of the oil nozzle suite and bundled by a small steel wire;

step nine: the oil hammer 7 is inserted into the oil pipe 6 and bundled by a small steel wire, and the steel wire cannot protrude greatly, so that the free sliding of the oil hammer in a small oil tank is influenced;

step ten: coating epoxy resin on the stop blocks of the raised edges on the periphery of the lower oil tank shell completing the seventh step in advance, inserting the upper oil tank shell assembly completing the tenth step into the lower oil tank shell completing the seventh step, and paying attention to that all edge stop blocks are attached to the inner edge of the upper oil tank shell;

step eleven: the joint surfaces of the upper shell and the lower shell of the oil tank are coated with epoxy resin by the sealing connecting cloth 3 to be adhered into a whole and sealed.

In the lower shell 2 of the oil tank, the height is about 10mm away from the surface edge of the lower shell of the oil tank, and a sponge body 4 with a semicircular hole cut at one end is filled in the lower shell to be approximately aligned with the semicircular hole of the small oil tank stop block 23;

advantageous effects

According to the structure characteristics and the manufacturing difficulty of the small oil tank, smooth oil supply of the oil tank in various flight attitude states is guaranteed, the inverted convex structure of the end face of the oil tank and the small oil tank oil separation plate with the back inclination angle of 10 degrees are ingeniously designed, and the 30Min non-stop oil supply of an airplane in a large diving angle (not more than 60 degrees) state is guaranteed; the use of a small oil suction and ventilation nozzle and a spherical oil hammer meets the oil supply requirements of the airplane in various flight postures such as climbing, rolling, diving and the like; oil-proof impact sponge is filled in the hollow cavity, so that oil liquid can not generate large oil liquid impact under various large overload postures, and the gravity center of the airplane can not be greatly changed; the oil tank base body is made of composite materials, so that the weight of the oil tank is reduced, the defect that the traditional oil tank is made of aluminum alloy in a welding manufacturing process is overcome, the oil tank is lighter and lower in cost under the condition of the same oil capacity.

Drawings

FIG. 1 is a schematic structural view of an oil tank to be formed according to an embodiment of the invention;

FIG. 2 is a schematic view of a mold on a fuel tank shell according to an embodiment of the invention;

FIG. 3 is a schematic view of a lower mold of a fuel tank shell according to an embodiment of the invention;

FIG. 4 is an exploded view of a fuel tank enclosure according to an embodiment of the present invention;

FIG. 5 is a schematic view of sponge filling of the lower case of the fuel tank according to the embodiment of the present invention;

FIG. 6 is a schematic view of the assembly of the oil nozzle of the upper shell of the oil tank according to the embodiment of the invention;

fig. 7 is a schematic view of the assembly of the upper shell of the fuel tank according to the embodiment of the invention.

The oil tank comprises an oil tank upper shell, an oil tank lower shell, a short side stop block 21, a long side stop block 22, a small oil tank stop block 23, a sealing connecting cloth 3, a sponge body 4, an oil nozzle assembly 5, an oil pipe 6 and an oil hammer 7.

Detailed description of the preferred embodiments

The present invention will be described in further detail with reference to the accompanying drawings, referring to fig. 1 to 7.

Fig. 1 is a schematic structural diagram of a fuel tank to be molded.

The oil tank shell is made of glass fiber composite materials, the thickness of the shell is 0.6mm, and the shell is laid and molded by a mold. The casing divide into casing and two subassemblies of casing down, go up casing and glib talker subassembly, oil pipe, the oil hammer links to each other, the junction of glib talker and last casing requires sealedly, glib talker and oil pipe are except inserting the knot, it is firm still to need to tie with thin steel wire, the oil hammer design is the ball type form, also need to tie with thin steel wire after pegging graft with oil pipe, oil pipe will choose for use soft material, do benefit to the aircraft under different course gestures, the oil hammer homoenergetic rolls the lowest of little oil tank, thereby guarantee the suction of oil. A small oil tank stop block needs to be adhered to the opening of the small oil tank of the lower shell, the stop block is inclined backwards, the inclination angle is about 10 degrees, and the periphery of the small oil tank is required to be adhered and sealed except for the upper semicircular hole of the partition plate. The inclination is favorable to the oil to smoothly flow into little oil tank through dog semicircle orifice and carry out the oil and supply. In the oil tank hollow portion, need fill the resistant oil sponge of 15PPi porosities, the sponge does not occupy the oil tank too much space, carries out big overload maneuver gesture at the aircraft, can control the fuel and produce the impact in the twinkling of an eye, and the fuel can also slowly free flow in the oil tank.

The technology aims to solve the problem that the oil supply 30Min of the airplane is not stopped when the airplane is in a large diving angle (not more than 60 degrees); the use of a small oil suction and ventilation nozzle and a spherical oil hammer meets the oil supply requirements of the airplane in various flight postures such as climbing, rolling, diving and the like; oil-proof impact sponge is filled in the hollow cavity, so that oil liquid cannot generate large oil liquid impact under various large overload postures, and the gravity center of the airplane is greatly changed; the oil tank base body is made of composite materials, so that the weight of the oil tank is reduced, the defect that the traditional oil tank is made of aluminum alloy in a welding manufacturing process is overcome, the oil tank is lighter and lower in cost under the condition of the same oil capacity.

The invention relates to a method for manufacturing a small oil tank adaptive to a large diving angle, which comprises the following steps:

step seven: a semicircular hole is cut at one end of the sponge body 4, the sponge body is filled into the lower shell 2 of the oil tank, the height of the semicircular hole is about 10mm of the surface edge of the lower shell of the oil tank, and the semicircular hole of the sponge body is approximately aligned with the semicircular hole of the small oil tank stop block 23;

step eight: inserting the oil nozzle suite 5 into a corresponding hole of the upper shell 1 of the oil tank, and firmly gluing the oil nozzle suite to be sealed;

step nine: the oil pipe 6 is sleeved into the corresponding oil suction nozzle of the oil nozzle suite and bundled by a small steel wire;

step 10: the oil hammer 7 is inserted into the oil pipe 6 and bundled by a small steel wire, and the steel wire cannot protrude greatly, so that the free sliding of the oil hammer in a small oil tank is influenced;

step 11: coating epoxy resin on the stop blocks of the raised edges on the periphery of the lower oil tank shell completing the seventh step in advance, inserting the upper oil tank shell assembly completing the tenth step into the lower oil tank shell completing the seventh step, and paying attention to that all edge stop blocks are attached to the inner edge of the upper oil tank shell;

step 12: the joint surfaces of the upper shell and the lower shell of the oil tank are coated with epoxy resin by the sealing connecting cloth 3 to be adhered into a whole and sealed.

Fig. 2 is a schematic diagram of a mold on a fuel tank shell, which shows a mold design method when laying down the fuel tank upper shell: in order to facilitate demoulding, the mould is divided into a left half and a right half, and when the mould is used, the positioning pins are inserted into the positioning holes at the two ends, so that the left mould and the right mould are combined into a whole. After the glass fiber composite material skin (0.6mm thick) is laid, the skin is cut and shaped along the upper opening of the die after being solidified, and the oil nozzle suite mounting hole is cut along the middle circular pit of the die. At the moment, the positioning pin holes at the left end and the right end are pulled out, the left die and the right die are separated, and the oil tank skin is demoulded.

Fig. 3 is a schematic view of a lower tank shell mold showing a mold design method in laying the lower tank shell: the specific laying operation steps are the same as the operation sequence of the upper shell of the oil tank.

As shown in fig. 4, the exploded view of the tank shell shows the process of assembling and sealing the upper and lower shells of the tank after assembling the components. Short side dog 21 and long side dog 22 bond firmly back 2 under the oil tank casing, casing 1 is neat with casing 2 lid down and is aligned on the oil tank, and short side dog 21 and long side dog 22 are scribbled earlier and are inserted the casing inboard on the oil tank after the epoxy adhesive, and the butt joint department of casing is along mending a sealing connection cloth 3 all around about the oil tank, and the effect of this connection cloth is casing about the firm connection oil tank of still outside the gap of casing about the sealed oil tank, makes it as an organic whole.

As shown in fig. 5, which is a schematic diagram of filling the sponge of the lower shell of the fuel tank, the diagram shows that the space area of the oil-proof sponge 4 with the porosity of 15PPi is filled in the lower shell of the fuel tank, the sponge does not occupy too much space of the fuel tank, the instant impact of the fuel can be controlled under the condition that the airplane is subjected to a large overload maneuver, and the fuel can slowly and freely flow in the fuel tank.

Fig. 6 is a schematic view of the assembly of the oil nozzle of the upper shell of the oil tank, which shows the assembly relationship of the oil nozzle set 5, the oil pipe 6 and the oil hammer 7. Go up the casing and link to each other with glib subassembly, oil pipe, oil hammer, the junction of glib and last casing requires sealedly, and glib and oil pipe are except inserting the knot, still need to tie up firmly with thin steel wire, and the oil hammer design is the ball form, also need tie up with thin steel wire after pegging graft with oil pipe, and soft material is chooseed for use to oil pipe, does benefit to the aircraft under different course gestures, and the oil hammer homoenergetic rolls the lowest of little oil tank to guarantee the suction of oil.

As shown in fig. 7, the upper case of the fuel tank is assembled schematically, which shows the assembled position of the upper and lower cases of the fuel tank, and the middle of the upper case is cut away to show the internal structure.

Claims

1. A method for manufacturing a small oil tank adapting to a large depression angle is characterized by comprising the following steps:

step four: the short side check blocks (21) are bonded on the left side and the right side of the lower shell of the oil tank by epoxy resin, and half of the short side check blocks are exposed in the width direction;

step five: bonding long side check blocks (22) to the front side and the rear side of the lower shell of the oil tank by using epoxy resin, and leaving half of the long check blocks exposed in the width direction;

step six: bonding a small oil tank stop block (23) to the inverted convex-shaped concave pit opening by using epoxy resin, keeping a 10-degree inclination angle with the bottom plane of the oil tank, and firmly bonding and sealing the periphery except the semicircular hole with the side wall of the oil tank;

step seven: inserting the oil nozzle sleeve (5) into a corresponding hole of the upper shell (1) of the oil tank, and firmly gluing the oil nozzle sleeve to be sealed;

step eight: the oil pipe (6) is sleeved into the corresponding oil suction nozzle of the oil nozzle sleeve and bundled by a small steel wire;

step nine: the oil hammer (7) is inserted into the oil pipe (6) and is bundled by a small steel wire, and the steel wire cannot protrude greatly, so that the free sliding of the oil hammer in a small oil tank is influenced;

step ten: coating epoxy resin on the stop blocks with raised edges on the periphery of the lower oil tank shell completing the seventh step in advance, inserting the upper oil tank shell assembly completing the tenth step into the lower oil tank shell completing the seventh step, and attaching all the edge stop blocks to the inner edge of the upper oil tank shell;

step eleven: the joint surfaces of the upper shell and the lower shell of the oil tank are coated with epoxy resin by a sealing connecting cloth (3) to be bonded into a whole and sealed.

2. A method for manufacturing a small fuel tank adapted to a large depression angle according to claim 1, wherein a sponge body (4) having a semicircular hole cut at one end is filled in the lower case (2) of the fuel tank at a height of about 10mm from the surface edge of the lower case of the fuel tank, and the semicircular hole of the sponge body is substantially aligned with the semicircular hole of the small fuel tank stopper (23).