An apparatus for refurbishing the surface of a heat exchanger for an aircraft air conditioning system

Abstract

The application discloses a device for surface treatment of an air conditioner heat exchanger of an airplane, which comprises a hanging basket for placing the heat exchanger, and further comprises: a derrick assembly with horizontal moving mechanism, lifting mechanism and tilting moving mechanism; a hanger connected with the derrick assembly to realize horizontal moving, lifting moving and tilting moving; the hanging basket is connected with the hanger, the hanging basket is a frame structure, and the bottom plate of the hanging basket is a hinged plate capable of rotating to a tilted state, a roller group composed of a plurality of rollers is installed on the hinged plate, and the heat exchanger is detachably fixed on the roller group. When the heat exchanger is subjected to surface treatment in a liquid tank, the inner and outer surfaces of the pipeline and core body of the heat exchanger can be fully contacted with the solution, so that local corrosion of the heat exchanger in the use process is avoided.

Description

Technical Field

[0001] This invention relates to the field of civil aviation, and more specifically to an apparatus for surface treatment of heat exchangers in aircraft air conditioning systems. Background Technology

[0002] The heat exchanger in an aircraft air conditioning system is a crucial component, directly affecting the ambient temperature of the cabin and cockpit, and thus impacting passenger and pilot comfort. However, due to years of use and the poor quality of the air medium flowing through it, heat exchangers frequently experience corrosion of the core, pipes, and flanges, resulting in a shortened component lifespan.

[0003] The current anti-corrosion treatment process for heat exchangers is as follows: The heat exchanger is fixed in a basket and then moved by a gantry crane to immerse it in different liquid tanks in sequence, so that an anti-corrosion coating is formed on the inner and / or outer surfaces of the heat exchanger's pipes and core.

[0004] However, the above-mentioned anti-corrosion process has the following problems:

[0005] 1. Based on the existing experience and methods of heat exchanger surface treatment by domestic and foreign repair manufacturers, it is impossible to thoroughly soak (or brush) the connection between the heat exchanger pipes and core with allodin solution. Therefore, the inner surface of the pipes is difficult to come into contact with allodin solution, resulting in the inability to form an effective anti-corrosion coating on the inner surface of the components. This leads to incomplete anti-corrosion treatment and causes the heat exchanger to be prone to localized corrosion.

[0006] 2. Due to the special honeycomb and pipe structure of the heat exchanger components, after the heat exchanger is horizontally immersed, a large amount of chemical raw material will be trapped inside the pipes and core each time it is lifted out of the liquid tank. The unemptied chemical raw material is very likely to contaminate the next liquid tank during the operation of the production line, causing cross-contamination of solutions between different liquid tanks, thereby affecting the chemical properties of the solution. Summary of the Invention

[0007] The purpose of this invention is to provide an apparatus for surface treatment of heat exchangers in aircraft air conditioning systems. When the heat exchanger is surface treated in a liquid tank, its pipes and core are fully in contact with the solution by flipping and tilting, forming a complete chemical conversion coating on the inner and outer surfaces, improving corrosion resistance, and avoiding cross-contamination of solutions in different liquid tanks.

[0008] The objective of this invention can be achieved through the following technical solutions.

[0009] An apparatus for surface treatment of heat exchangers in aircraft air conditioning systems, comprising a basket for placing the heat exchanger, and further comprising:

[0010] The gantry crane assembly includes a horizontal movement mechanism, a lifting mechanism, and a tilting movement mechanism.

[0011] The hanger is connected to the gantry crane assembly, enabling horizontal, vertical, and tilting movements.

[0012] The suspended basket is connected to the hanging frame. The suspended basket has a frame structure, and the bottom plate of the suspended basket is a rocker that can be rotated to an inclined state. A roller group consisting of several rollers is installed on the rocker, and the heat exchanger is detachably fixed to the roller group.

[0013] The device of this invention controls the horizontal and vertical movement of the heat exchanger within the basket into the liquid tank via a gantry crane assembly. Inside the tank, based on the heat exchanger's structural characteristics, the gantry crane assembly and rocker control the heat exchanger to tilt forward and backward and / or left and right at a certain angle. For example, the pipe opening is directed upwards to allow gas to escape from the pipe, and downwards to allow the solution to escape. This ensures that the solution in the tank can fully contact the inner and outer surfaces of the heat exchanger, forming a complete chemical conversion coating and improving corrosion resistance. Before entering the next tank after immersion in the previous tank, tilting the heat exchanger allows the solution in the pipe to be completely drained, preventing cross-contamination.

[0014] The present invention also has the following preferred designs:

[0015] The bottom center of the rocker of the present invention is connected to a rotating shaft, and the rotating shaft is connected to a power source. The rotating shaft drives the rocker to tilt and move back and forth along the length of the basket.

[0016] The tilting and moving mechanism of the present invention includes a moving wheel and two hanging chains. The hanging chains are connected to the moving wheel, and the two ends of each hanging chain are connected to the lifting points on the hanging frame. The hanging frame is lifted by the four lifting points. The moving wheel rotates to adjust the height of the lifting points at both ends of the hanging chains, so that the hanging frame and the basket connected to the hanging frame tilt left and right along the width direction of the basket.

[0017] The gantry crane assembly of the present invention is disposed above multiple liquid tanks for holding surface treatment solutions. The basket is lifted by connecting the hanger, so that the basket can move horizontally or vertically to enter or leave each liquid tank.

[0018] The suspended basket of the present invention is a cuboid frame.

[0019] The upper part of the suspended basket of the present invention is provided with four lifting supports, which are fixedly connected to the hanging frame.

[0020] The present invention has the following beneficial effects:

[0021] 1. This invention uses a gantry crane assembly to control the horizontal and vertical movement of a heat exchanger within a suspended basket as it enters a liquid tank. Inside the tank, the gantry crane assembly and a rocker arm control the heat exchanger to tilt forward and backward and / or left and right at a certain angle, allowing the solution in the tank to fully contact the inner and outer surfaces of the heat exchanger, forming a complete chemical conversion coating and improving corrosion resistance. Before entering the next tank after immersion in the previous tank, tilting the heat exchanger allows the solution in the pipes to be completely drained, preventing cross-contamination.

[0022] 2. The roller assembly provided in this invention facilitates workers in moving heavier heat exchangers into or out of the suspended basket. Attached Figure Description

[0023] Figure 1 This is a front view of an apparatus for surface treatment of heat exchangers in an aircraft air conditioning system according to the present invention.

[0024] Figure 2 This is a side view of an apparatus for surface treatment of heat exchangers in an aircraft air conditioning system according to the present invention, in which the basket is in a vertical position.

[0025] Figure 3 This is a side view of an apparatus for surface treatment of heat exchangers in an aircraft air conditioning system according to the present invention, in which the basket is tilted left and right.

[0026] Figure 4 This is a front view of the suspended basket of the present invention, which includes a schematic diagram of a heat exchanger;

[0027] Figure 5 This is a side view of the suspended basket of the present invention;

[0028] Figure 6 This is a top view of the suspended basket of the present invention;

[0029] Figure 7 for Figure 4 A schematic diagram of the tilted state of the swing platform in the middle hanging basket.

[0030] Explanation of reference numerals in the attached drawings: 1-Gantry assembly, 11-Horizontal moving mechanism, 12-Lifting mechanism, 13-Drive wheel, 14-Lifting chain, 2-Hanging frame, 3-Suspended basket, 31-Lifting support, 32-Hostle, 33-Rotating shaft, 34-Roller, 4-Gantry mounting frame, 5-Heat exchanger. Detailed Implementation

[0031] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand and implement the technical solution of the present invention.

[0032] like Figures 1 to 7As shown, an apparatus for surface treatment of heat exchangers in an aircraft air conditioning system includes a basket 3 for placing the heat exchanger 5, and further includes:

[0033] The gantry crane assembly 1 has a horizontal moving mechanism 11, a lifting mechanism 12 and a tilting moving mechanism. The horizontal moving mechanism 11 can be moved horizontally by a slide rail structure in the prior art, and the lifting mechanism 12 can be moved vertically by an actuator, linear motor or other structure in the prior art. The gantry crane assembly 1 is mounted on the gantry crane mounting frame 4. Multiple liquid tanks (not shown in the figure) for surface treatment steps are placed directly below the gantry crane mounting frame 4.

[0034] The hanger 2 is connected to the gantry crane assembly 1, enabling horizontal, vertical, and tilting movements.

[0035] The suspended basket 3 is connected to the hanging frame 2. The suspended basket 3 has a frame structure, and the bottom plate of the suspended basket 3 is a rocker plate 32 that can be rotated to an inclined state. A roller group consisting of several rollers 34 is installed on the rocker plate 32, and the heat exchanger 5 is detachably fixed on the roller group.

[0036] As a preferred embodiment:

[0037] A rotating shaft 33 is connected to the middle of the bottom of the rocker 32. The rotating shaft 33 is connected to a power source. The rotation of the rotating shaft 33 drives the rocker 32 to tilt back and forth along the length of the basket 3.

[0038] The tilting and moving mechanism includes a moving wheel 13 and two lifting chains 14. The lifting chains 14 are connected to the moving wheel 13. The two ends of each lifting chain 14 are connected to the lifting points on the gantry 2. The gantry 2 is lifted by the four lifting points. The moving wheel 13 rotates to adjust the height of the lifting points at both ends of the lifting chains 14, so that the gantry 2 and the basket 3 connected to the gantry 2 tilt left and right along the width direction of the basket 3.

[0039] The gantry crane assembly 1 is positioned above multiple liquid tanks used to hold surface treatment solutions. The basket 3 is lifted by the connecting hanger 2, allowing the basket 3 to move horizontally or vertically to enter or leave each liquid tank.

[0040] The suspended platform 3 is a rectangular frame. Four lifting supports 31 are provided on the upper part of the suspended platform 3, which are fixedly connected to the hanger 2.

[0041] In this embodiment, the gantry crane assembly 1 may also be equipped with an actuator to control the gantry crane assembly 1 to make the hanger 2 tilt and move back and forth.

[0042] The adjustable range of movement for gantry crane assembly 1 is shown in the table below:

[0043]

[0044] The tilt adjustment range of rocker 32:

[0045]

[0046] The operating method of this device is as follows:

[0047] 1. One end of the heat exchanger 5 is placed on the roller assembly consisting of rollers 34, and is pushed into the basket 3 by the workers. Then it is pressed by the pressure device, and the basket 3 and the heat exchanger 5 are sent into the liquid tank by the gantry crane assembly 1.

[0048] 2. The tail of the rocker arm 32 of the suspended basket 3 is tilted upwards (i.e., tilted forwards and backwards) by 25°, see [reference]. Figure 7 The state;

[0049] 3. The heat exchanger 5 is in the basket 3 and moves left and right or forward and backward in conjunction with the gantry crane assembly 1. This is equivalent to the tail of the heat exchanger component tilting upward by 50°, and can be accompanied by a 20° tilt to the left or right. During this process, the heat exchanger pipes and the inner and outer surfaces of the core can be fully in contact with the solution by flipping and tilting.

[0050] 4. After soaking in the previous liquid tank (e.g., the previous tank contained an acidic deoxidizer for pre-treatment against corrosion), as the basket 3 and heat exchanger 5 leave the liquid surface, tilting the basket to completely drain any solution hidden inside the pipes or core. Then, the solution enters the next tank containing the anti-corrosion solution (alool), avoiding contamination between solutions.

[0051] When the heat exchanger is surface treated in the liquid tank using the device of the present invention, the inner and outer surfaces of the heat exchanger's pipes and core can be in full contact with the solution, thus avoiding localized corrosion of the heat exchanger during use.

[0052] The above embodiments are merely preferred embodiments of the present invention, but should not be construed as limiting the invention. Any modifications and improvements made based on the concept of the present invention should fall within the protection scope of the present invention, and the specific protection scope is subject to the claims.

Claims

1. An apparatus for surface treatment of heat exchangers in aircraft air conditioning systems, comprising a basket for placing the heat exchanger, characterized in that, Also includes: The gantry crane assembly includes a horizontal movement mechanism, a lifting mechanism, and a tilting movement mechanism. The hanger is connected to the gantry crane assembly, enabling horizontal, vertical, and tilting movements. The suspended basket is connected to the hanging frame. The suspended basket has a frame structure, and the bottom plate of the suspended basket is a rocker that can be rotated to an inclined state. The rocker moves back and forth along the length of the suspended basket. A roller group consisting of several rollers is installed on the rocker. The heat exchanger is detachably fixed to the roller group. The tilting mechanism causes the basket to tilt left and right along its width.

2. The apparatus for surface treatment of heat exchangers in aircraft air conditioning systems according to claim 1, characterized in that: A rotating shaft is connected to the bottom center of the rocker, and the rotating shaft is connected to a power source. The rotation of the rotating shaft drives the rocker to tilt and move back and forth along the length of the basket.

3. The apparatus for surface treatment of heat exchangers in aircraft air conditioning systems according to claim 2, characterized in that: The tilting and moving mechanism includes a moving wheel and two suspension chains. The suspension chains are connected to the moving wheel, and the two ends of each suspension chain are connected to the lifting points on the gantry. The gantry is lifted by the four lifting points. The rotation of the moving wheel adjusts the height of the lifting points at both ends of the suspension chains, so that the gantry and the basket connected to the gantry tilt left and right along the width direction of the basket.

4. The apparatus for surface treatment of aircraft air conditioning system heat exchangers for overhaul according to claim 3, characterized in that: The gantry crane assembly is positioned above multiple liquid tanks for holding surface treatment solutions. The basket is lifted by the connecting frame, allowing the basket to move horizontally or vertically to enter or leave each liquid tank.

5. The apparatus for surface treatment of heat exchangers in aircraft air conditioning systems according to claim 4, characterized in that: The suspended platform is a rectangular frame.

6. The apparatus for surface treatment of heat exchangers in aircraft air conditioning systems according to claim 5, characterized in that: The upper part of the suspended platform is provided with four lifting supports, which are fixedly connected to the hanging frame.

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