A high-pressure, high-flow, high-precision air bridge balance

Abstract

A high-pressure, high-flow, high-precision air bridge balance belongs to the technical field of wind tunnel balances. The present invention solves the problem of low strength of existing air bridge balances. The balance model end calibration piece and base of the present invention, a balance bracket is installed on the base, the balance is installed on the base through the balance bracket, the support rod end of the balance is connected to the balance support rod end calibration piece, the model end of the balance is connected to the balance model end calibration piece, the air bridge integration is installed on the balance bracket through the model end connector and the support rod end connector, and two groups of air bridge integrations are symmetrically arranged on both sides of the balance. A high-pressure, high-flow, high-precision air bridge balance of the present invention improves the strength of the balance, and the maximum stress generated by the air bridge balance is on the four-column beam of the balance, and the stress magnitude is about 648MPa, which meets the strength requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel balances, and in particular relates to a high-pressure, high-flow, high-precision air bridge balance. Background Art

[0002] In order to reduce the impact of the power system on the aerodynamic characteristics of the aircraft in the current aviation field, an integrated design method that treats the power unit and the fuselage as a whole has been developed. In wind tunnel tests, the main engine simulation devices used are ejector simulators (ejectors) and turbine powered simulators (TPS) to simulate turbofan engines, namely ejector power simulation test technology and TPS test technology.

[0003] When conducting a full-machine model TPS power simulation wind tunnel test in a wind tunnel, the test requires a large high-pressure air supply capacity, and the compressed air is input into the model through a reasonable air supply pipeline. Therefore, the internal air bridge balance that combines the air bridge with the strain balance has become a key equipment in the TPS power simulation test technology. The turbine power simulator (TPS) requires high-pressure air to drive. When the high-pressure air flows through the pipeline, it will bring a certain interference force to the balance measurement, resulting in a certain impact on the force measurement accuracy of the full-model test. Therefore, it is very necessary to eliminate the interference of the high-pressure air supply pipeline. Eliminating or weakening the interference load on the balance force measurement when the compressed air flows through the balance is a necessary prerequisite for ensuring the acquisition of high-precision test data.

[0004] An air bridge balance is a special type of balance that uses the balance of gas buoyancy and gravity to weigh objects. The working principle of this balance is based on Archimedean principle, which states that the buoyancy of an object in a liquid or gas is equal to the weight of the liquid or gas it displaces.

[0005] An air bridge balance usually consists of two balance arms and a buoyancy sensor. There is an air flow device above the balance that produces a steady air flow so that the airflow speeds on both sides of the balance are equal and opposite. The object is placed on one of the balance arms, while the other balance arm is used for calibration.

[0006] When an object is placed on the balance arm, the balance arm will be pressed down a little due to the gravity of the object. As the airflow passes through, the airflow above the balance arm will generate an upward buoyancy. This buoyancy just balances the gravity of the object, keeping the balance arm horizontal, thus achieving a balanced state of weighing.

[0007] The size of the buoyancy depends on the volume and density of the object. By measuring the force exerted on the buoyancy sensor, the weight or mass of the object can be determined. Air bridge balances are often used to accurately measure the weight of tiny objects, with the advantages of high sensitivity and stability.

[0008] It should be noted that the measurement results of the air bridge balance may be affected by environmental factors, such as changes in airflow or increased resistance. Therefore, when using the air bridge balance for measurement, calibration and control of environmental conditions are required to ensure accuracy and reliability. The present invention obtains a high-pressure, high-flow, and high-precision air bridge balance through the structural design of the balance and the selection of the air bridge elastic unit structure. Summary of the invention

[0009] The purpose of the present invention is to solve the above technical problems. A brief summary of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this summary is not an exhaustive summary of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0010] The technical solution of the present invention:

[0011] A high-pressure, high-flow, high-precision air bridge balance, comprising a balance, a balance rod end calibration piece, an air bridge integration, a balance model end calibration piece and a base, wherein a balance bracket is installed on the base, the balance is installed on the base through the balance bracket, the balance rod end is connected to the balance rod end calibration piece, the balance model end is connected to the balance model end calibration piece, the air bridge integration is installed on the balance bracket through the model end connector and the support rod end connector, and two sets of air bridge integrations are symmetrically arranged on both sides of the balance;

[0012] The air bridge integration includes a first pipeline integration and a second pipeline integration, one end of the first pipeline integration is connected to the first flange connecting pipeline through the first air bridge interference elimination unit, the first flange connecting pipeline is connected to the balance bracket through the model end connecting piece, the other end of the first pipeline integration is connected to one end of the second pipeline integration through the second air bridge interference elimination unit, the other end of the second pipeline integration is connected to the second flange connecting pipeline through the third air bridge interference elimination unit, and the second flange connecting pipeline is connected to the balance bracket through the support rod end connecting piece.

[0013] Furthermore, the first air bridge interference elimination unit, the second air bridge interference elimination unit and the third air bridge interference elimination unit have the same structure, and the first air bridge interference elimination unit includes a horizontal interference elimination unit movable part, an interference elimination unit elastic beam, a bellows assembly and a fixed part, the fixed part is integrated with the first pipeline through a flange sealing plate, the bellows assembly is mounted on the fixed part, the fixed part is connected to the elastic beam of the interference elimination unit, the elastic beam of the interference elimination unit is arranged on the outside of the bellows assembly, and the horizontal interference elimination unit movable part is connected to the first flange connecting pipeline.

[0014] Furthermore, a model end plugging cover is provided at the end of the first flange connection pipeline, and a support rod end plugging cover is provided at the end of the second flange connection pipeline.

[0015] Furthermore, a sealing ring is arranged between the inner side of the model end plugging cover and the first flange connecting pipeline, a flange adjustment gasket is arranged between the model end plugging cover and the first flange connecting pipeline, a sealing ring is arranged between the flange sealing plate and the fixing part, and a sealing ring is arranged between the flange sealing plate and the first pipeline integration.

[0016] Furthermore, a protective cover is provided on the outside of the balance, and the protective cover includes a first balance insulation protective cover, a second balance insulation protective cover, a third balance insulation protective cover and a fourth balance insulation protective cover. The first balance insulation protective cover, the second balance insulation protective cover, the third balance insulation protective cover and the fourth balance insulation protective cover form a cylindrical insulation cover covering the balance.

[0017] Furthermore, an air bridge conforming frame is installed on the base, a buffer pad is arranged on the air bridge conforming frame, the buffer pad is in integrated contact with the air bridge, and a balance plug connector is arranged at the end of the balance support rod end calibration piece.

[0018] Furthermore, temperature sensors are installed on the first air bridge interference elimination unit, the second air bridge interference elimination unit and the third air bridge interference elimination unit respectively.

[0019] Furthermore, it also includes a transport beam, which is set between two symmetrically arranged groups of air bridge assemblies, one end of the transport beam is connected to the model end connecting piece, and the other end is connected to the support rod end connecting piece, and a plurality of lifting rings are evenly distributed on the transport beam.

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

[0021] The high-pressure, high-flow, and high-precision air bridge balance of the present invention enables the balance to maintain high-precision measurement results in a high-pressure, high-flow working environment. Each air bridge interference elimination unit has two rotational degrees of freedom, which is equivalent to a cross hinge. Under the action of the air bridge interference elimination unit, the pressure influence force can be effectively weakened and the stiffness of the air bridge can be reduced.

[0022] A high-pressure, high-flow, high-precision air bridge balance of the present invention reduces the influence of high-pressure gas temperature on the force measuring accuracy and performance of the balance. An external temperature protection cover consisting of a first balance thermal insulation protection cover, a second balance thermal insulation protection cover, a third balance thermal insulation protection cover and a fourth balance thermal insulation protection cover is provided on the outside of the balance, thereby achieving a better protection effect on the balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a high-pressure, high-flow, high-precision air bridge balance;

[0024] Figure 2 It is a main view of a high-pressure, high-flow, high-precision air bridge balance;

[0025] Figure 3 It is a side view of a high-pressure, high-flow, high-precision air bridge balance;

[0026] Figure 4 It is the front view of the air bridge integration;

[0027] Figure 5 It is a top view of the air bridge integration;

[0028] Figure 6 yes Figure 5 Middle AA section view.

[0029] In the figure: 1-balance rod end calibration piece, 2-first balance insulation protection cover, 3-air bridge integration, 4-hanging ring, 5-second balance insulation protection cover, 6-balance model end calibration piece, 7-base, 8-third balance insulation protection cover, 9-air bridge conformal frame, 10-buffer pad, 11-fourth balance insulation protection cover, 12-balance bracket, 13-balance plug connector, 15-model end connector, 16-rod end connector, 17-first air bridge interference elimination unit, 18-first Pipeline integration, 19-second pipeline integration, 20-carrying beam, 21-model end plugging cover, 22-support rod end plugging cover, 23-first flange connecting pipeline, 24-second flange connecting pipeline, 25-temperature sensor, 26-sealing ring, 27-flange adjustment gasket, 28-flange sealing plate, 29-horizontal interference elimination unit movable part, 30-interference elimination unit elastic beam, 31-bellows assembly, 32-fixed part, 33-second air bridge interference elimination unit, 34-third air bridge interference elimination unit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] Embodiment 1, combination Figure 1-Figure 6 The present embodiment is described. A high-pressure, high-flow, high-precision air bridge balance of the present embodiment comprises a balance, a balance rod end calibration component 1, an air bridge integration 3, a balance model end calibration component 6 and a base 7. A balance bracket 12 is mounted on the base 7. The balance is mounted on the base 7 via the balance bracket 12. The balance rod end is connected to the balance rod end calibration component 1, the balance model end is connected to the balance model end calibration component 6, the air bridge integration 3 is mounted on the balance bracket 12 via the model end connector 15 and the rod end connector 16, and two sets of air bridge integrations 3 are symmetrically arranged on both sides of the balance.

[0032] The air bridge integration 3 includes a first pipeline integration 18 and a second pipeline integration 19, one end of the first pipeline integration 18 is connected to the first flange connection pipeline 23 through the first air bridge interference elimination unit 17, the first flange connection pipeline 23 is connected to the balance bracket 12 through the model end connector 15, the other end of the first pipeline integration 18 is connected to one end of the second pipeline integration 19 through the second air bridge interference elimination unit 33, the other end of the second pipeline integration 19 is connected to the second flange connection pipeline 24 through the third air bridge interference elimination unit 34, and the second flange connection pipeline 24 is connected to the balance bracket 12 through the support rod end connector 16.

[0033] Two balance brackets 12 are arranged on the base 7 in the front and back, one balance bracket 12 is arranged at the near model end of the balance, and the other balance bracket 12 is arranged at the near support rod end of the balance. The first flange connection pipeline 23 is connected to the balance bracket 12 near the model end through the model end connector 15, and the second flange connection pipeline 24 is connected to the balance bracket 12 near the support rod end through the support rod end connector 16.

[0034] The first air bridge interference elimination unit 17, the second air bridge interference elimination unit 33 and the third air bridge interference elimination unit 34 have the same structure. The first air bridge interference elimination unit 17 includes a horizontal interference elimination unit movable part 29, an interference elimination unit elastic beam 30, a bellows assembly 31 and a fixed part 32. The fixed part 32 is connected to the first pipeline integration 18 through a flange sealing plate 28. A sealing ring 26 is arranged between the flange sealing plate 28 and the fixed part 32. A sealing ring 26 is arranged between the flange sealing plate 28 and the first pipeline integration 18. The sealing ring 26 improves the sealing effect between the first pipeline integration 18, the flange sealing plate 28 and the fixed part 32. A bellows assembly 31 is mounted on the fixed part 32. The fixed part 32 is connected to the interference elimination unit elastic beam 30. The interference elimination unit elastic beam 30 is arranged on the outside of the bellows assembly 31. The horizontal interference elimination unit movable part 29 is connected to the first flange connecting pipeline 23. Each air bridge interference elimination unit has two rotational degrees of freedom, which is equivalent to a cross hinge. Under the action of each air bridge interference elimination unit, the pressure influence force is effectively weakened and the stiffness of the air bridge is reduced. Figure 5 As shown, each air bridge interference elimination unit adopts the form of a bellows. The arrow in the figure points to the flow path of the airflow. When the airflow flows through the air bridge interference elimination unit from the pipeline, it first passes through the internal bellows structure to reduce the impact and fluctuation caused by the airflow. At the same time, the external structure of the air bridge interference elimination unit is equivalent to a cross hinge, which performs secondary interference elimination on the airflow. Three air bridge interference elimination units are arranged on each air bridge, that is, to ensure that the airflow has six degrees of freedom when it flows between the model end and the fixed end, effectively reducing the impact of the airflow flowing through the pipeline on the balance. The first air bridge interference elimination unit 17, the second air bridge interference elimination unit 33 and the third air bridge interference elimination unit 34 are respectively installed with temperature sensors 25, and the temperature is detected and corrected by the temperature sensor 25.

[0035] A model end plugging cover 21 is installed at the end of the first flange connection pipeline 23, and a sealing ring 26 is arranged between the inner side of the model end plugging cover 21 and the outer wall of the first flange connection pipeline 23 to improve the airtightness of the air bridge integration 3. Similarly, a support rod end plugging cover 22 is arranged at the end of the second flange connection pipeline 24, and a sealing ring 26 is also arranged between the inner side of the support rod end plugging cover 22 and the outer wall of the second flange connection pipeline 24. A flange adjustment gasket 27 is arranged between the model end plugging cover 21 and the first flange connection pipeline 23, and a flange adjustment gasket 27 is also arranged between the support rod end plugging cover 22 and the second flange connection pipeline 24, and the model end plugging cover 21 and the support rod end plugging cover 22 are fine-tuned by the flange adjustment gasket 27.

[0036] The air bridge after the first pipeline integration 18 is connected to the second pipeline integration 19, wherein part of the pipeline is U-shaped, and the U-shaped pipeline part is placed on the air bridge shape-keeping frame 9, and the air bridge shape-keeping frame 9 is installed on the base 7, and a buffer pad 10 is laid on the air bridge shape-keeping frame 9, and the buffer pad 10 protects the U-shaped pipeline part of the air bridge.

[0037] Embodiment 2, combined Figure 1-Figure 6 The present embodiment is described. The present embodiment is a high-pressure, high-flow, high-precision air bridge balance. In order to reduce the influence of the high-pressure gas temperature on the force measuring accuracy and performance of the balance, a protective cover is arranged outside the balance. The protective cover includes a first balance insulation protection cover 2, a second balance insulation protection cover 5, a third balance insulation protection cover 8 and a fourth balance insulation protection cover 11. The first balance insulation protection cover 2, the second balance insulation protection cover 5, the third balance insulation protection cover 8 and the fourth balance insulation protection cover 11 form a cylindrical insulation cover covering the balance. The first balance insulation protection cover 2, the second balance insulation protection cover 5, the third balance insulation protection cover 8 and the fourth balance insulation protection cover 11 are made of heat-resistant resin and formed by 3D printing. Insulating material is sprayed on the outer surface of each insulation protection cover, and an anti-thermal radiation film is attached as a temperature radiation shield. There is a distance of 2 mm between two adjacent insulation protection covers. The four insulation protection covers protect the balance to ensure the force measuring accuracy and performance of the balance.

[0038] Embodiment 3, combined Figure 1-Figure 6 To illustrate the present embodiment, a high-pressure, high-flow, high-precision air bridge balance according to the present embodiment is used for easy transportation. In order to facilitate the transportation of the balance, a group of transport beams 20 are arranged between two symmetrically arranged groups of air bridge assemblies 3. One end of the transport beam 20 is connected to the model end connector 15, and the other end is connected to the support rod end connector 16. A plurality of lifting rings 4 are evenly distributed on the transport beam 20. The lifting hooks and lifting equipment are connected through the lifting rings 4 to facilitate the movement and transportation of the entire equipment.

[0039] This embodiment is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A high-pressure, high-flow, high-precision air bridge balance, characterized by: The invention comprises a balance, a balance rod end calibration component (1), an air bridge assembly (3), a balance model end calibration component (6) and a base (7), wherein a balance bracket (12) is mounted on the base (7), the balance is mounted on the base (7) via the balance bracket (12), the balance rod end is connected to the balance rod end calibration component (1), the balance model end is connected to the balance model end calibration component (6), the air bridge assembly (3) is mounted on the balance bracket (12) via a model end connector (15) and a balance rod end connector (16), and two sets of air bridge assemblies (3) are symmetrically arranged on both sides of the balance; The air bridge assembly (3) comprises a first pipeline assembly (18) and a second pipeline assembly (19), one end of the first pipeline assembly (18) is connected to a first flange connection pipeline (23) via a first air bridge interference elimination unit (17), the first flange connection pipeline (23) is connected to a balance bracket (12) via a model end connection piece (15), the other end of the first pipeline assembly (18) is connected to one end of the second pipeline assembly (19) via a second air bridge interference elimination unit (33), the other end of the second pipeline assembly (19) is connected to a second flange connection pipeline (24) via a third air bridge interference elimination unit (34), and the second flange connection pipeline (24) is connected to the balance bracket (12) via a support rod end connection piece (16); The first air bridge interference elimination unit (17), the second air bridge interference elimination unit (33) and the third air bridge interference elimination unit (34) have the same structure. The first air bridge interference elimination unit (17) comprises a horizontal interference elimination unit movable part (29), an interference elimination unit elastic beam (30), a bellows assembly (31) and a fixed part (32). The fixed part (32) is connected to the first pipeline assembly (18) through a flange sealing plate (28). The bellows assembly (31) is mounted on the fixed part (32). The fixed part (32) is connected to the interference elimination unit elastic beam (30). The interference elimination unit elastic beam (30) is arranged on the outside of the bellows assembly (31). The horizontal interference elimination unit movable part (29) is connected to the first flange connection pipeline (23).

2. A high-pressure, high-flow, high-precision air bridge balance according to claim 1, characterized in that: The end of the first flange connection pipeline (23) is provided with a model end plugging cover (21), and the end of the second flange connection pipeline (24) is provided with a support rod end plugging cover (22).

3. A high-pressure, high-flow, high-precision air bridge balance according to claim 2, characterized in that: A sealing ring (26) is provided between the inner side of the model end plugging cover (21) and the first flange connection pipeline (23), a flange adjustment gasket (27) is provided between the model end plugging cover (21) and the first flange connection pipeline (23), a sealing ring (26) is provided between the flange sealing plate (28) and the fixing portion (32), and a sealing ring (26) is provided between the flange sealing plate (28) and the first pipeline assembly (18).

4. A high-pressure, high-flow, high-precision air bridge balance according to claim 3, characterized in that: A protective cover is arranged on the outside of the balance, the protective cover comprising a first balance thermal insulation protective cover (2), a second balance thermal insulation protective cover (5), a third balance thermal insulation protective cover (8) and a fourth balance thermal insulation protective cover (11), the first balance thermal insulation protective cover (2), the second balance thermal insulation protective cover (5), the third balance thermal insulation protective cover (8) and the fourth balance thermal insulation protective cover (11) forming a cylindrical thermal insulation cover covering the balance.

5. A high-pressure, high-flow, high-precision air bridge balance according to claim 1 or 3, characterized in that: An air bridge shape-preserving frame (9) is mounted on the base (7), a buffer pad (10) is arranged on the air bridge shape-preserving frame (9), the buffer pad (10) is in contact with the air bridge assembly (3), and a balance plug connector (13) is arranged at the end of the balance support rod end calibration piece (1).

6. A high-pressure, high-flow, high-precision air bridge balance according to claim 4, characterized in that: Temperature sensors (25) are respectively installed on the first air bridge interference elimination unit (17), the second air bridge interference elimination unit (33) and the third air bridge interference elimination unit (34).

7. A high-pressure, high-flow, high-precision air bridge balance according to claim 5, characterized in that: It also includes a transport crossbeam (20), which is disposed between two symmetrically arranged groups of air bridge assemblies (3), one end of the transport crossbeam (20) is connected to the model end connecting piece (15), and the other end is connected to the support rod end connecting piece (16), and a plurality of lifting rings (4) are evenly distributed on the transport crossbeam (20).

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