阅读说明：本技术 一种冷喷涂枪快速加热装置 (Quick heating device of cold spraying gun ) 是由 李羿含 张清贵 李星彤 高植强 徐建 于 2020-10-06 设计创作，主要内容包括：本发明涉及飞机起落架梁疲劳裂纹修复设备技术领域,具体为一种冷喷涂枪快速加热装置。该冷喷涂枪快速加热装置,包括外壳,所述外壳的内部设置有发热部；所述外壳内还设有环绕在发热部外的电磁感应线圈；所述发热部的内部开设有多条导气通道；每条所述导气通道均沿发热部内部曲折环绕。本发明的有益效果是:该冷喷涂枪快速加热装置,通过对电磁感应线圈通电,使其周围产生磁场,从而对发热部的内部产生感应涡电流,使得整个发热部迅速升温,当高压气体从发热部内的导气通道流通过程中会与导气通道的内壁充分接触,从而保证气体能充分换热,即实现对气体的快速升温处理,整个加热过程升温快,绝缘性好,能耗小,换热效率高。(The invention relates to the technical field of airplane landing gear beam fatigue crack repairing equipment, in particular to a quick heating device of a cold spraying gun. The quick heating device of the cold spray gun comprises a shell, wherein a heating part is arranged inside the shell; an electromagnetic induction coil surrounding the heating part is also arranged in the shell; a plurality of air guide channels are arranged in the heating part; each air guide channel is wound along the inside of the heating part in a zigzag mode. The rapid heating device of the cold spraying gun has the advantages that the electromagnetic induction coil is electrified to generate a magnetic field around the electromagnetic induction coil, so that induced eddy current is generated inside the heating part, the whole heating part is rapidly heated, and high-pressure gas can be fully contacted with the inner wall of the gas guide channel in the heating part in the circulation process of the high-pressure gas from the gas guide channel in the heating part, so that the gas can be fully subjected to heat exchange, namely, the rapid heating treatment of the gas is realized.)

1. A quick heating device of a cold spray gun is characterized by comprising a shell (1), wherein a heating part (2) is arranged inside the shell (1); an electromagnetic induction coil (3) surrounding the heating part (2) is also arranged in the shell (1);

a plurality of air guide channels (21) are arranged in the heating part (2); each air guide channel (21) is wound along the inside of the heating part (2) in a zigzag way; the air inlet end of each air guide channel (21) is provided with an air inlet pipe (101) extending out of the shell (1), and the air outlet end of each air guide channel is provided with an air outlet pipe (102) extending out of the shell (1).

2. The rapid heating device of a cold spray gun according to claim 1, wherein each of the air guide channels (21) is distributed along the same plane, and the distance between two adjacent air guide channels (21) is equal.

3. The rapid heating device of a cold spray gun according to claim 1, characterized by comprising two air collecting hoppers (4); a gas collection cavity is formed in the gas collection hopper (4), one end of the gas collection hopper is communicated with a main gas pipe (401), and the other end of the gas collection hopper is communicated with a plurality of auxiliary gas guide branch pipes (402); a plurality of auxiliary air guide branch pipes (402) of one air collecting hopper (4) are correspondingly connected with a plurality of air inlet pipes (101); and a plurality of auxiliary air guide branch pipes (402) of the other air collecting hopper (4) are correspondingly connected with a plurality of exhaust pipes (102).

4. The rapid heating device of claim 3, wherein a temperature sensor is arranged in the gas collection cavity of the gas collection hopper (4).

5. The rapid heating device of a cold spray gun according to claim 1, wherein the inner wall of the housing (1) is provided with a high temperature resistant layer (5), and a heat insulating layer (6) is further provided between the gap between the high temperature resistant layer (5) and the heat generating part (2).

6. The rapid heating device of claim 1, wherein the heat generating portion (2) is made of one of molybdenum, tungsten and rhenium.

7. The rapid heating device of a cold spray gun according to claim 1, characterized in that the housing (1) comprises two half shells (1 a); a connecting piece for splicing is arranged between the two half shells (1 a); the connecting piece comprises a groove (1b) and a bulge (1c) which are respectively arranged on the splicing surfaces of the two half shells (1a) and are matched with each other.

Technical Field

The invention relates to the technical field of airplane landing gear beam fatigue crack repairing equipment, in particular to a quick heating device of a cold spraying gun.

Background

With the increase of combat training frequency and strength, the landing gear of a large number of active main combat types starts to generate fatigue cracks with different degrees, and once the fatigue cracks are generated, if the fatigue cracks are not processed in time, the service life of the landing gear is seriously influenced. Fatigue cracks are found in the landing gear beam when a certain type of airplane is overhauled, and the cold spraying technology is determined to be adopted to increase the material and prolong the service life for repairing through earlier research and demonstration.

The cold spraying equipment adopted at present preheats high-pressure carrier gas to a higher temperature by an electric heater, the carrier gas enters a Laval nozzle to be accelerated to form supersonic airflow, spraying powder is carried by powder conveying airflow and is axially injected into the nozzle, and then high-speed particles impact a substrate in a solid state to generate severe plastic deformation to form a coating due to the fact that the supersonic airflow in the nozzle is accelerated to a high speed.

However, in the existing gas heating process, resistance is generally adopted for heating, and a medium is conducted through a flow pipeline and flows through a heater for heating, but the method has the problem of low heating efficiency, and the temperature of the heated gas is relatively low.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a quick heating device of a cold spraying gun to solve the problem that the heating efficiency of the heating device is too low in the gas heating process.

The technical scheme for solving the technical problems is as follows: a quick heating device of a cold spray gun comprises a shell, wherein a heating part is arranged inside the shell; an electromagnetic induction coil surrounding the heating part is also arranged in the shell;

a plurality of air guide channels are arranged in the heating part; each air guide channel is wound along the inside of the heating part in a zigzag manner; the air inlet end of each air guide channel is provided with an air inlet pipe extending out of the shell, and the air outlet end of each air guide channel is provided with an air outlet pipe extending out of the shell.

Furthermore, each air guide channel is distributed along the same plane, and the distance between every two adjacent air guide channels is equal.

Further, two air collecting hoppers are included; a gas collection cavity is formed in the gas collection hopper, one end of the gas collection hopper is communicated with a main gas pipe, and the other end of the gas collection hopper is communicated with a plurality of auxiliary gas guide branch pipes; a plurality of auxiliary air guide branch pipes of one air collecting hopper are correspondingly connected with a plurality of air inlet pipes; and a plurality of auxiliary air guide branch pipes of the other air collecting hopper are correspondingly connected with a plurality of exhaust pipes.

Furthermore, a temperature sensor is arranged in the gas collection cavity of the gas collection hopper.

Further, the inner wall of the shell is provided with a high temperature resistant layer, and a heat preservation layer is arranged between the high temperature resistant layer and a gap of the heating part.

Further, the heating part is made of one of molybdenum, tungsten and rhenium.

Further, the housing comprises two half shells; a connecting piece for splicing is arranged between the two half shells; the connecting piece comprises a groove and a protruding part which are respectively arranged on the splicing surfaces of the two half shells and are matched with each other.

The rapid heating device of the cold spraying gun has the advantages that the electromagnetic induction coil is electrified to generate a magnetic field around the electromagnetic induction coil, so that induced eddy current is generated inside the heating part, the whole heating part is rapidly heated, and high-pressure gas can be fully contacted with the inner wall of the gas guide channel in the heating part in the circulation process of the high-pressure gas from the gas guide channel in the heating part, so that the gas can be fully subjected to heat exchange, namely, the rapid heating treatment of the gas is realized.

Drawings

FIG. 1 is a schematic diagram of a high pressure cold spray system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a conventional high-pressure cold spray system;

FIG. 3 is a front view of the rapid heating apparatus of the cold spray gun of the present invention;

FIG. 4 is a top view of the rapid heating device of the cold spray gun of the present invention;

FIG. 5 is a schematic view showing the internal structure of the rapid heating apparatus of the cold spray gun according to the present invention;

FIG. 6 is a cross-sectional view of a heat-generating portion of the present invention;

fig. 7 is a schematic structural view of the housing of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the device comprises a shell, a shell body 1a, a half shell body 1b, a groove 1c, a bulge, 101, an air inlet pipe 102, an air outlet pipe 2, a heating part 21, an air guide channel 3, an electromagnetic induction coil 4, an air collecting hopper 401, a main air guide pipe 402, an auxiliary air guide branch pipe 5, a high-temperature resistant layer 6, a heat insulation layer 7, a heating device 8, a powder feeder 9, a Laval nozzle 10 and a substrate.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

Landing gear is an attachment device for supporting an aircraft for ground (surface) movement during takeoff and landing or ground (surface) taxiing on the lower portion of the aircraft. The landing gear is the only part for supporting the whole airplane, so that the landing gear is an integral part of the airplane; without it, the aircraft cannot move on the ground. After the aircraft takes off, the landing gear may be retracted depending on flight performance. The landing gear device is an important bearing and maneuvering part of the aircraft, and plays an extremely important role in the safe taking-off and landing process of the aircraft. The landing gear is a support system necessary for taking off, landing, running, ground moving and parking of the airplane, is one of main parts of the airplane, and the quality of the performance of the landing gear is directly related to the use safety of the airplane.

Cold spraying is a spray technique based entirely on the aerodynamic principle. The particles are low in heating temperature and still keep solid, and the solid particles are deposited on the surface of a workpiece through mechanical processes such as adiabatic shear instability caused plastic rheology or severe plastic deformation under the conditions of extremely high stress, strain and strain rate. Therefore, the particles are not easy to be oxidized, burnt, phase change, structure change and the like in the spraying process.

The residual stress of the coating is mainly compressive stress, the spraying efficiency is high, and thick coatings and even block materials can be prepared. Based on the characteristics, the technology has obvious advantages in the aspects of preparing and developing novel material coatings such as nano and amorphous material coatings and other heat-sensitive material coatings, and is low in energy consumption, recyclable in material resources and free of environmental pollution, thereby being a green spraying technology. Through the experiment, adopt the cold spraying mode of repairing to restore the tired line of aircraft landing gear roof beam, can effectively promote the structural strength and the surperficial integrality of landing gear roof beam, avoided the emergence life-span of the whole crackle of structure, promoted the fatigue life of landing gear roof beam base member to a large extent.

It should be noted that, as shown in fig. 2, the system of the conventional high-pressure cold spraying is mainly composed of a heating device 7, a powder feeder 8, and a Laval nozzle 9. In the cold spraying technology, high-pressure carrier gas (usually air, nitrogen, helium or other mixed gas) is preheated to a higher temperature (usually 300-.

Because this heating device adopts resistance heating mostly, has the problem that heating efficiency is lower, leads to the temperature behind the gas heating to be difficult to reach expected value.

The electric heating device adopted at present generally adopts the following two heating modes:

the first mode that adopts the helical tube heating, for example, the bulletin number is CN210951849U, the utility model discloses a cold spray gun rapid heating device's chinese patent wherein discloses heats the cartridge heater through heating resistor, and the gaseous process that passes through the spiral pipe has prolonged the heat transfer time to promote the heating effect.

The second type of spiral heating element, for example, CN102206820B, entitled air heater for cold spray, discloses a spiral heating element, in which gas is conducted through a metal shell, and the gas is rapidly heated by passing through the heating element.

Above-mentioned two kinds of heating methods all adopt the mode of resistance-type heating to heat, will realize higher heating temperature, are difficult to effective selection to the conducting material that can last work under the high temperature, and the device intensity requirement of conveying gas is great among the heating process moreover, and there are the problem that the energy consumption is too high and heat exchange efficiency is low in whole heating process.

As shown in fig. 1 to 6, in order to solve the above problems, the present invention provides a rapid heating device for a cold spray gun, comprising a housing 1, a heating portion 2 provided inside the housing 1; an electromagnetic induction coil 3 surrounding the heating part 2 is also arranged in the shell 1.

A plurality of air guide channels 21 are arranged in the heating part 2; each air guide channel 21 is wound along the inside of the heat generating part 2, as shown in fig. 5 and 6, so that the residence time of the air in the heat generating part 2 is effectively increased; the air inlet end of each air guide channel 21 is provided with an air inlet pipe 101 extending out of the casing 1, and the air outlet end is provided with an air outlet pipe 102 extending out of the casing 1. The heating device adopts an electromagnetic induction heating mode, the heating efficiency is higher, a magnetic field is generated around the electromagnetic induction coil 3 by electrifying the electromagnetic induction coil, so that induced eddy current is generated inside the heating part 2, the whole heating part 2 is heated up rapidly, and high-pressure gas can be in full contact with the inner wall of the gas guide channel 21 in the process of flowing from the gas guide channel 21 in the heating part 2, so that the gas can be ensured to exchange heat fully, namely, the rapid heating treatment of the gas is realized, and the schematic diagram of a system of the heating device applied to high-pressure cold spraying is shown in figure 1; whole heating process can heat high-pressure gas to required temperature rapidly, and heating temperature easily controls moreover, and the energy consumption of working process is littleer, and insulating nature is higher, has promoted heating process's security.

In this embodiment, five air guide channels 21 are provided, each air guide channel 21 is distributed along the same plane, the distance between two adjacent air guide channels 21 is equal, a single high-pressure gas is sent into a plurality of air guide channels 21, and the gas in each air guide channel 21 can stably exchange heat with the heating portion 2 in the flowing process, so that the heat exchange efficiency is further improved.

Further, the quick heating device of the cold spray gun also comprises two air collecting hoppers 4; a gas collection cavity is formed in the gas collection hopper 4, one end of the gas collection hopper is communicated with a main gas guide pipe 401, and the other end of the gas collection hopper is communicated with a plurality of auxiliary gas guide branch pipes 402; a plurality of auxiliary air guide branch pipes 402 of one air collecting hopper 4 are correspondingly connected with a plurality of air inlet pipes 101; a plurality of auxiliary air guide branch pipes 402 of the other air collecting hopper 4 are correspondingly connected with a plurality of exhaust pipes 102; the main air duct 401 of the front air collecting hopper 4 is connected with high-pressure air flow, and single-strand high-pressure air flow is rapidly dispersed into a plurality of air flows after passing through the air collecting hopper 4 and is conveyed into the corresponding air guide channels 21 through the auxiliary air guide branch pipes 402 respectively to complete heating. After the gas is heated, multiple gas flows sequentially pass through the auxiliary gas guide branch pipes 402 and enter the gas collecting hopper 4 arranged behind, the gas collecting hopper 4 integrates the multiple gas flows into a single gas flow and the single gas flow is conveyed through the main gas guide pipe 401, and the gas heating can be completed.

In this embodiment, a temperature sensor is arranged in the gas collection cavity of the gas collection hopper 4, and the temperature before and after the gas is heated is detected, so that the power of the electromagnetic induction coil 3 is accurately adjusted, and the heating temperature is accurately controlled.

In this embodiment, the inner wall of the housing 1 is provided with a high temperature resistant layer 5, the high temperature resistant layer 5 may be an alumina ceramic fiber product, a heat insulating layer 6 is further disposed between the high temperature resistant layer 5 and the gap of the heating portion 2, and the heat insulating layer 6 may be a novel ceramic material such as boron nitride.

In the present embodiment, the heat generating portion 2 is made of one of molybdenum, tungsten and rhenium, and in the present embodiment, tungsten is preferred. Tungsten belongs to nonferrous metals, generally has a melting point higher than 1650 ℃, is high in hardness and is a paramagnetic substance, and has good heat conduction performance relative to the magnetic permeability of 50, so that the tungsten can be used as a manufacturing material of the heating part 2 in the embodiment and can effectively and rapidly heat gas.

In the present embodiment, as shown in fig. 7, the housing 1 includes two housing halves 1 a; a connecting piece for splicing is arranged between the two half shells 1 a; the connecting piece comprises a groove 1b and a bulge 1c which are respectively arranged on the splicing surfaces of the two half shells 1a and are matched with each other. The bulge 1c and the groove 1b are mutually matched to realize splicing and disassembling of the two half shells 1a, so that internal components of workers can be maintained.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.