A wind tunnel experiment sensitive paint coating spraying device

Abstract

The present application provides a kind of wind tunnel experiment sensitive paint coating spraying device, it includes workbench, rotary table, model support rod, adapter ring, connecting rod, conductive slip ring and electrostatic spray gun;Rotary table is installed on the tabletop of workbench;Adapter ring is sleeved and fixed to the end of model support rod that extends above rotary table;Experimental model is placed on the upper part of adapter ring and is fixedly connected with model support rod;One end of connecting rod is fixedly connected with the end of model support rod that extends below the tabletop of workbench;Conductive slip ring is fixed on conductive slip ring installation base, rotor part is fixedly connected to the other end of connecting rod, rotor wire is wound on connecting rod, stator wire is connected with the electrode of electrostatic spray gun;Rotary table and adapter ring and the tabletop of workbench are all insulated by electrically insulating structure.The present application has reasonable structure design, simple operation and use, can realize the production of wind tunnel experiment full model sensitive paint coating, and can strongly promote the development of wind tunnel experiment sensitive paint measurement technology.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing technology for aircraft, and specifically to a wind tunnel testing sensitive paint coating spraying device. Background Technology

[0002] Wind tunnel testing is an essential part of aircraft design and a key technology for verifying the aerodynamic characteristics of aircraft. With the development of hypersonic aircraft, their shapes are becoming increasingly complex, demanding higher spatial resolution from wind tunnel measurements. To meet these needs, surface parameter measurement techniques for models, such as temperature-sensitive paint and pressure-sensitive paint measurement, have been developed in recent years to measure the temperature and pressure distribution characteristics of model surfaces. In the early stages of development, these techniques were primarily used to measure localized areas of aircraft models with simple shapes and small dimensions, making the fabrication of the sensitive paint coating relatively easy. However, with the improvement of sensitive paint measurement technology, the measurement area has expanded from localized to the entire model, making the fabrication of the sensitive paint coating increasingly difficult. Because sensitive paint is expensive and is primarily for scientific experiments, the number of models requiring coating is limited. Immersing the model in sensitive paint would waste a significant amount of paint; therefore, wind tunnel testing can only use spraying methods to fabricate sensitive paint coatings.

[0003] The difficulty in creating a full-model sensitive paint coating is mainly due to:

[0004] 1) The experimental model is a three-dimensional model. In order to ensure the uniformity of the coating when spraying the entire model, a professional workbench is required to enable the experimental model to rotate 360 ​​degrees during the spraying process, and the speed can be adjusted, compared to partial spraying.

[0005] 2) Compared to local spraying, the curvature of the entire model varies over a larger range, which places higher demands on the adhesion of the sensitive paint coating. On the one hand, the adhesion can be enhanced by adjusting the ratio of the sensitive paint components, and on the other hand, an electrostatic spraying process is required to enhance the adhesion.

[0006] Because electrostatic spraying requires the model to be connected to the high-voltage electrodes of the electrostatic spraying device, the spraying device must achieve both rotation and electrical conductivity between the model and the electrostatic spray gun electrodes. However, existing electrostatic spraying methods are mainly designed for static models and lack corresponding spraying devices. Summary of the Invention

[0007] To address the problems existing in the aforementioned background technology, this invention proposes a wind tunnel experimental sensitive paint coating spraying device with a reasonable structural design, convenient and simple operation, capable of producing sensitive paint coatings for the entire model of wind tunnel experiments, and which can strongly promote the development of sensitive paint measurement technology in wind tunnel experiments.

[0008] To solve the above-mentioned technical problems, the present invention provides a wind tunnel experimental sensitive paint coating spraying device, which includes a worktable, a rotary table, a model support rod, an adapter ring, a connecting rod, a conductive slip ring, and an electrostatic spray gun; the rotary table is fitted onto the surface of the worktable; the model support rod is fitted vertically through the rotary table and the surface of the worktable, with one end extending upwards from the rotary table and the other end extending downwards from the surface of the worktable; the adapter ring is fitted onto the end of the model support rod extending upwards from the rotary table and fixed to the model support rod; the experimental model is fitted onto the upper part of the adapter ring and... The model support rod is fixedly connected to one end extending upwards from the rotary table; one end of the connecting rod is fixedly connected to the end extending downwards from the surface of the worktable from the model support rod; the conductive slip ring is matched and fixedly mounted on a conductive slip ring mounting base located directly below the connecting rod, and its rotor portion is fixedly connected to the other end of the connecting rod, with the rotor wire wound around the connecting rod; the electrostatic spray gun is located outside the worktable, and its electrode is connected to the stator wire of the conductive slip ring; the rotary table and the adapter ring, as well as the rotary table and the surface of the worktable, are all insulated by an electrical insulation structure.

[0009] The wind tunnel experimental sensitive paint coating spraying device includes: a rotating table comprising a base fixed to the upper part of the workbench and a turntable disposed on the upper part of the base; a stepper motor is also mounted on the base; the stepper motor is connected to the turntable through a worm gear structure and can drive it to rotate 360 ​​degrees.

[0010] The wind tunnel experimental sensitive paint coating spraying device includes: a base through hole that is vertically aligned and opened at the center of the base, allowing the model support rod to pass through; a turntable through hole that is vertically aligned and opened at the center of the turntable, allowing the model support rod to pass through; and the turntable through hole and the base through hole are coaxial.

[0011] The wind tunnel experimental sensitive paint coating spraying device, wherein: an insulating rubber ring is fitted between the bottom of the base and the surface of the workbench.

[0012] The wind tunnel experimental sensitive paint coating spraying device includes an insulating rubber ring sandwiched between the lower end face of the adapter ring and the upper end face of the turntable.

[0013] The wind tunnel experimental sensitive paint coating spraying device includes a metal adapter ring with an inner diameter larger than the outer diameter of the model support rod, a lower end face diameter larger than the diameter of the turntable, and an upper end face completely covered by the bottom of the experimental model.

[0014] The wind tunnel experimental sensitive paint coating spraying device includes: the lower end face of the adapter ring is connected to the upper end face of the turntable by screws; a locking thread hole is radially matched on one side of the middle part of the adapter ring, and a locking screw is used in the locking thread hole to fix it to the model support rod.

[0015] The wind tunnel experimental sensitive paint coating spraying device includes a model support rod made of metal. Its upper end extends upwards from the turntable and is fixedly connected to the experimental model by screws. An internal threaded hole is provided in the center of the lower end face along the axial direction.

[0016] The wind tunnel experimental sensitive paint coating spraying device includes a connecting rod made of metal, one end of which is connected to the internal threaded hole through an external thread structure, and is secured with a locking nut to the end of the model support rod that extends below the worktable.

[0017] The wind tunnel experimental sensitive paint coating spraying device includes: the conductive slip ring mounting base is a cement component; the conductive slip ring is fixed to the upper part of the conductive slip ring mounting base by expansion screws; the rotor part of the conductive slip ring is fixed to the other end of the connecting rod by screws.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects:

[0019] The wind tunnel experimental sensitive paint coating spraying device of this invention has a reasonable structural design and is simple and convenient to operate. It can efficiently realize the production of sensitive paint coating for three-dimensional full model of wind tunnel experiment, improve the coating adhesion and uniformity, and thus ensure the accuracy of experimental measurement results.

[0020] The application of the wind tunnel experimental sensitive paint coating spraying device of this invention can greatly promote the development of wind tunnel experimental sensitive paint measurement technology, realize high-precision measurement of aerodynamic parameters of the whole model, provide fine aerodynamic data for hypersonic vehicle design, optimize the aerodynamic performance of hypersonic vehicles, and is suitable for promotion and application. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the wind tunnel experimental sensitive paint coating spraying device of the present invention;

[0023] Figure 2This invention relates to a wind tunnel experimental sensitive paint coating spraying device. Figure 1 A magnified view of region A in the middle. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] like Figures 1 to 2 As shown, the wind tunnel experimental sensitive paint coating spraying device provided in this embodiment includes a workbench 1, a rotary table 2, a model support rod 3, an adapter ring 4, an insulating rubber ring 5, a connecting rod 6, a conductive slip ring mounting base 7, a conductive slip ring 8, and an electrostatic spray gun 9.

[0027] The workbench 1 consists of a support column 11 and a table surface 12 that is horizontally fixed on the upper part of the support column 11; the table surface 12 has a through hole in the center along the vertical direction, through which the model support rod 3 can pass.

[0028] The rotary table 2 includes a base 21 and a turntable 22. The base 21 is fixed to the center of the top surface of the table 12 of the workbench 1, specifically by screws. An insulating rubber ring 5 (i.e., an electrical insulation structure) is fitted between the bottom of the base 21 and the top surface of the table 12. The turntable 22 is mounted on the upper part of the base 21. A vertical through-hole is formed in the center of the base 21, through which the model support rod 3 can pass. A vertical through-hole is also formed in the center of the turntable, through which the model support rod 3 can pass. The turntable through-hole and the base through-hole are coaxial. A stepper motor is also mounted on the base 21, which drives the turntable 22 to rotate via a worm gear structure. The turntable 22 can rotate the experimental model 10 360 degrees, and the rotation speed and direction are adjustable.

[0029] The model support rod 3 is made of metal and, from top to bottom, it is matched with the turntable through hole of the turntable 22, the base through hole of the base 21, and the worktable through hole of the table surface 12 of the worktable 1. The upper end of the model support rod 3 extends above the top surface of the turntable 22, and the lower end extends below the bottom of the table surface 12. The model support rod 3 has an internal threaded hole axially matched from the center of its lower end face. The depth of the internal threaded hole must meet the installation requirements of the conductive slip ring 7.

[0030] The adapter ring 4 is made of metal, with an inner diameter slightly larger than the outer diameter of the model support rod 3, providing installation space for the model support rod 3. The adapter ring 4 is fitted onto the end of the model support rod 3 extending above the top surface of the turntable 22. A locking threaded hole is radially formed on one side of the middle of the adapter ring 4, and a locking screw 41 is used to fix it to the model support rod 3, allowing it to rotate synchronously with the turntable 22. The lower end face of the adapter ring 4 is connected to the turntable 22 of the turntable 2 by screws, and another insulating rubber ring 5 is sandwiched between the lower end face of the adapter ring 4 and the upper end face of the turntable 22. The diameter of the lower end face of the adapter ring 4 is larger than the diameter of the turntable 22 to prevent sensitive paint from spraying onto the turntable 2 and other components during the spraying process. The upper end face of the adapter ring 4 is completely covered by the bottom of the experimental model 10 to ensure that the sensitive paint flows naturally during the spraying process and does not accumulate between the adapter ring 4 and the experimental model 10, forming a step. Since the rotation of the turntable 22 is driven by a stepper motor mounted on the base 21, and the operating voltage of the stepper motor is different from that of the electrostatic spray gun 9, the insulating rubber ring 5 is used to achieve electrical insulation between the turntable 2 and the experimental model 10 and the workbench 1.

[0031] The connecting rod 6 is made of metal. Its upper end is connected to the internal threaded hole in the center of the lower end face of the model support rod 3 through an external thread structure, and is locked and fixed to the lower end of the model support rod with a locking nut 61.

[0032] The conductive slip ring mounting base 7 is a cement component and is located directly below the connecting rod 6. The conductive slip ring 8 is fixedly mounted on its upper center by an expansion screw.

[0033] The conductive slip ring 8 is a standard product. Its rotor part is fixed to the lower end of the connecting rod 6 by a side screw. The rotor wire is wound around the connecting rod 6 to ensure good contact. The stator wire of the conductive slip ring 8 is connected to the electrode of the electrostatic spray gun 9 located outside the workbench 1, so that the electrode of the electrostatic spray gun 9 and the experimental model 10 are always in a conductive state during the model rotation.

[0034] The experimental model 10 is made of metal, and its size and shape are determined according to the wind tunnel experiment content and requirements. The bottom center of the experimental model 10 is fixedly connected to the upper end of the model support rod 3 with screws. After the experimental model 10 is coated with sensitive paint, it should be avoided as much as possible to protect the sensitive paint coating. To facilitate the installation of the experimental model 10 inside the wind tunnel experimental chamber, the model support rod 3 is pre-connected to the experimental model 10 with screws. After coating, the experimental model 10 can be installed by moving the model support rod 3. The dimensions of the model support rod 3 are compatible with the support structure inside the wind tunnel experimental chamber. The model support rod 3 also serves to fix the experimental model 10 during the sensitive paint coating process. Both the experimental model 10 and the model support rod 3 are made of metal.

[0035] The installation or use process of the wind tunnel experimental sensitive paint coating spraying device of the present invention is as follows:

[0036] (1) Place workbench 1 in place;

[0037] (2) Place the insulating rubber ring 5 on the workbench 1, place the rotary table 2, and connect the lower part of the base 21 to the table surface 12 of the workbench 1 with screws, and use the insulating rubber ring 5 to ensure electrical insulation.

[0038] (3) Place another insulating rubber ring 5 on the upper part of the turntable 22, place the adapter ring 4 on it and connect it with screws. The adapter ring 4 and the turntable 22 are electrically insulated.

[0039] (4) The experimental model 10 is connected to the model support rod 3. After cleaning the oil and dust, it is placed on the upper part of the connecting ring 4. The model support rod 3 is inserted into the connecting ring 4 and the locking screw 41 is tightened so that the turntable 22 and the experimental model 10 can rotate synchronously.

[0040] (5) Screw the locking nut 61 into the connecting rod 6, and screw the connecting rod 6 into the internal thread hole on the lower end face of the model support rod 3;

[0041] (6) Use expansion screws to fix the conductive slip ring 8 onto the conductive slip ring mounting base 7 and move it directly below the connecting rod 6;

[0042] (7) Rotate the connecting rod 6 to make it enter the rotor mounting hole of the conductive slip ring 8 and tighten the side screws to fix it;

[0043] (8) Rotate the locking nut 61 to make the connecting rod 6 and the model support rod 3 firmly connected without shaking;

[0044] (9) Set up the electrostatic spray gun 9;

[0045] (10) Wrap the rotor wire of the conductive slip ring 8 around the connecting rod 6, and connect the stator electrode wire of the conductive slip ring 8 to the electrode of the electrostatic spray gun 9 to achieve conduction between the electrode of the static spray gun 9 and the experimental model 10.

[0046] (11) Start spraying, and remove in reverse order of installation after completion.

[0047] The invention has a reasonable structural design and can realize the fabrication of sensitive paint coatings for the entire model of wind tunnel experiments, which can greatly promote the development of sensitive paint measurement technology in wind tunnel experiments.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind tunnel experimental sensitive paint coating spraying device, characterized in that... The spraying device includes a worktable, a rotary table, a model support rod, an adapter ring, a connecting rod, a conductive slip ring, and an electrostatic spray gun. The rotary table is fitted and mounted on the table surface of the workbench; The model support rod is matched to the vertical surface of the rotary table and the worktable, with one end extending upwards from the rotary table and the other end extending downwards from the surface of the worktable. The adapter ring is fitted onto the end of the model support rod that extends upward toward the rotary table and is fixed to the model support rod; the experimental model is placed on the upper part of the adapter ring and is fixedly connected to the end of the model support rod that extends upward toward the rotary table. One end of the connecting rod is fixedly connected to the end of the model support rod that extends below the surface of the workbench; The conductive slip ring is fixedly mounted on the conductive slip ring mounting base located directly below the connecting rod, and its rotor portion is fixedly connected to the other end of the connecting rod, with the rotor wire wound around the connecting rod; The electrostatic spray gun is located outside the workbench, and its electrodes are connected to the stator wires of the conductive slip ring. The rotary table and the adapter ring, as well as the rotary table and the worktable, are insulated from each other by an electrical insulation structure. The rotary table includes a base fixed to the upper part of the worktable and a turntable disposed on the upper part of the base; a stepper motor is also mounted on the base; the stepper motor is connected to the turntable through a worm gear structure and can drive it to rotate 360 ​​degrees. An insulating rubber ring is fitted between the bottom of the base and the surface of the workbench. Another insulating rubber ring is sandwiched between the lower end face of the adapter ring and the upper end face of the turntable, which is the electrical insulation structure. The adapter ring is made of metal, with an inner diameter larger than the outer diameter of the model support rod, a lower end face diameter larger than the diameter of the turntable, and an upper end face completely covered by the bottom of the experimental model.

2. The wind tunnel experimental sensitive paint coating spraying device as described in claim 1, characterized in that... The base has a vertical through hole at its center, through which the model support rod can pass; the turntable has a vertical through hole at its center, through which the model support rod can pass; the turntable through hole and the base through hole are coaxial.

3. The wind tunnel experimental sensitive paint coating spraying device as described in claim 1, characterized in that... The lower end face of the adapter ring is connected to the upper end face of the turntable by screws; a locking thread hole is radially matched on one side of the middle part of the adapter ring, and a locking screw is used in the locking thread hole to fix it to the model support rod.

4. The wind tunnel experimental sensitive paint coating spraying device as described in claim 1, characterized in that: The model support rod is made of metal. Its upper end, which extends upwards toward the turntable, is fixedly connected to the experimental model by screws. An internal threaded hole is provided in the center of the lower end face along the axial direction.

5. The wind tunnel experimental sensitive paint coating spraying device as described in claim 4, characterized in that: The connecting rod is made of metal, and one end of it is connected to the internal threaded hole through an external thread structure. It is also secured with a lock nut to the end of the model support rod that extends below the surface of the worktable.

6. The wind tunnel experimental sensitive paint coating spraying device as described in claim 1, characterized in that: The conductive slip ring mounting base is a cement component; the conductive slip ring is fixed to the upper part of the conductive slip ring mounting base by expansion screws; the rotor part of the conductive slip ring is fixed to the other end of the connecting rod by screws.

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