Airplane hydraulic experiment table test modification device

Abstract

The utility model relates to test modification of a hydraulic test bench, in particular to a test modification device of an airplane hydraulic test bench. By reducing the number of test point joints, the joint connecting positions of the system are reduced, so that the problem of oil leakage at the connecting positions is effectively reduced. Comprising a hydraulic pipeline I, a hydraulic pipeline II, a temperature sensor, a pressure sensor, a hydraulic finished product and a test five-way joint, the test five-way joint adopts a five-way structure, the five-way structure comprises a central chamber and five branch channels communicated with the central chamber, the five branch channels are all communicated with the central chamber, and the free end of each branch channel is an outlet; wherein the first outlet is connected with the temperature sensor and is used for monitoring the temperature of the hydraulic system in real time; the second outlet is connected with the pressure sensor and is used for detecting the pressure of the hydraulic system; the third outlet is connected with the hydraulic pipeline I; the fourth outlet is connected with the hydraulic pipeline II; and the fifth outlet is connected with the hydraulic finished product.

Description

Technical Field

[0001] The utility model relates to the test modification of a hydraulic test bench, in particular to a test modification device for an aircraft hydraulic test bench. Background Art

[0002] In order to better meet the requirements of modern aero-engines, it is necessary to improve the existing hydraulic test bench. In the current use of the hydraulic test bench, the hydraulic pipeline mainly adopts 1Cr18Ni9Ti material. However, due to the limitations of traditional 1Cr18Ni9Ti and 0Cr18Ni9 materials in terms of corrosion resistance and mechanical strength, their deficiencies have gradually emerged, and they even face the situation of being phased out in some application fields.

[0003] Currently, as Figure 1 shown, the test of the aircraft hydraulic test bench usually includes the method of pairing a single temperature or pressure sensor with a test joint, and the method of using pipe clamps (such as Figure 2 ) to fix the hydraulic pipeline. These pipe clamps help to reduce the vibration during system operation, thus ensuring the accuracy of test data and the stability of the system. However, this existing technology has the following objective disadvantages:

[0004] 1. Although 1Cr18Ni9Ti stainless steel has good plasticity and toughness, its ability to resist stress corrosion cracking and pitting corrosion is relatively weak. In addition, the uneven distribution of titanium elements in this alloy may cause intergranular corrosion problems, thus affecting the overall quality of the material. Moreover, due to the poor performance of 1Cr18Ni9Ti in terms of hardness and high-pressure resistance, when the hydraulic test is in a high-pressure environment for a long time, leakage or pipe wall expansion may occur.

[0005] 2. A large number of joint connections increase the risk of leakage, especially oil leakage is likely to occur at the connection points.

[0006] 3. When the working temperature reaches 135 °C, the rubber gasket on the pipe clamp will melt due to high temperature and adhere to the outside of the pipeline, affecting the reliability and service life of the system. Summary of the Invention

[0007] The utility model aims at the defects existing in the prior art and provides a test modification device for an aircraft hydraulic test bench.

[0008] To achieve the above object, the utility model adopts the following technical solutions, including a first hydraulic pipeline, a second hydraulic pipeline, a temperature sensor, a pressure sensor, and a hydraulic finished product. It is characterized in that it further includes a test five-way joint; (The test five-way structure is used to connect the hydraulic pipeline and the hydraulic finished product, so that the fluid can flow in different directions, facilitating multi-directional testing.)

[0009] The described test five-way joint adopts a five-way structure, which includes a central chamber and five branch channels connected to the central chamber, and all five branch channels are connected to the central chamber. The free end of each branch channel is an outlet; among them, the first outlet is connected to the temperature sensor for real-time monitoring of the temperature of the hydraulic system;

[0010] The second outlet is connected to the pressure sensor for detecting the pressure of the hydraulic system;

[0011] The third outlet is connected to the first hydraulic pipeline;

[0012] The fourth outlet is connected to the second hydraulic pipeline;

[0013] The fifth outlet is connected to the hydraulic finished product.

[0014] Furthermore, the first hydraulic pipeline and the second hydraulic pipeline adopt seamless stainless steel pipes of 03Cr21Ni6Mn9N.

[0015] Furthermore, the first hydraulic pipeline and the second hydraulic pipeline are both fixed to the hydraulic installation platform through their respective pipe clamps. The pipe clamp is used to fix the hydraulic pipeline to ensure that it will not shift or loosen during operation.

[0016] Even further, the pipe clamp includes a pipe clamp body, and a through hole one for fixing the corresponding hydraulic pipeline is provided on the pipe clamp body. A fluoroplastics bushing is provided on the inner wall of the through hole one; during use, the corresponding hydraulic pipeline passes through the through hole one and the fluoroplastics bushing.

[0017] Even further, the corresponding hydraulic pipeline is in contact with the fluoroplastics bushing.

[0018] Even further, the pipe clamp body is made of aluminum material.

[0019] Even further, the pipe clamp body is fixed to the hydraulic installation platform through fasteners, and a through hole two for the fasteners to pass through is provided on the pipe clamp body.

[0020] Even further, the fasteners adopt screws, and the screws pass through the through hole two and are threadedly connected to the hydraulic installation platform.

[0021] Compared with the prior art, the beneficial effects of the present utility model.

[0022] 1) By replacing the raw materials of the hydraulic pipeline, the present utility model reduces the leakage and wall expansion of the system under high pressure conditions.

[0023] 2) By reducing the number of test point joints, the present utility model reduces the joint connections of the system, thereby effectively reducing the oil leakage problem at the joints.

[0024] 3) The utility model fixes the pipeline through pipe clamps, avoiding the situation that the pipe hoop melts at high temperature of the system, resulting in unstable pipeline structure of the system and rubber melting and sticking to the pipeline. Brief Description of the Drawings

[0025] The following further describes the utility model in conjunction with the drawings and specific embodiments. The protection scope of the utility model is not limited to the description of the following content.

[0026] Figure 1 is a schematic structural diagram of an existing aircraft hydraulic test bench.

[0027] Figure 2 is a schematic structural diagram of an existing pipe hoop.

[0028] Figure 3 is a schematic diagram of a test modification device for an aircraft hydraulic test bench in a specific embodiment.

[0029] Figure 4 is a schematic structural diagram of a pipe clamp in a specific embodiment.

[0030] In the figure, 1, hydraulic installation platform; 2, test joint one; 3, test joint two; 4, temperature sensor; 5, pressure sensor; 6, pipe hoop; 7, hydraulic finished product; 8, rubber; 9, metal support; 10, test five-way joint; 11, pipe clamp; 12, hydraulic pipeline one; 13, hydraulic pipeline two; 14, pipe clamp body; 15, bushing. Detailed Description of the Embodiments

[0031] To make the objectives, technical solutions and beneficial effects of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0032] As Figures 3 - 4 shown, the test modification device of the aircraft hydraulic test bench includes a hydraulic pipeline one 12, a hydraulic pipeline two 13, a temperature sensor 4, a pressure sensor 5, and a hydraulic finished product 7, and also includes a test five-way joint 10; the test five-way structure is used to connect the hydraulic pipeline and the hydraulic finished product 7, so that the fluid can flow in different directions, facilitating multi-directional testing.

[0033] The test five-way joint 10 adopts a five-way structure, which includes a central chamber and five branch channels connected to the central chamber, and all five branch channels are connected to the central chamber. The free end of each branch channel is an outlet; among them, the first outlet is connected to the temperature sensor 4 for real-time monitoring of the temperature of the hydraulic system; the second outlet is connected to the pressure sensor 5 for detecting the pressure of the hydraulic system; the third outlet is connected to the first hydraulic pipeline 12, the fourth outlet is connected to the second hydraulic pipeline 13, and the fifth outlet is connected to the hydraulic finished product 7.

[0034] Example 1: The first hydraulic pipeline 12 and the second hydraulic pipeline 13 adopt seamless stainless steel pipes of 03Cr21Ni6Mn9N. Specifically, the system is divided into two hydraulic lines through the pipeline joint via the hydraulic finished product 7. The first hydraulic pipeline 12 leads to the landing gear control line, and the second hydraulic pipeline 13 leads to the hatch retraction line.

[0035] Example 2: The first hydraulic pipeline 12 and the second hydraulic pipeline 13 are both fixed to the hydraulic installation platform 1 through their respective pipe clamps 11. The pipe clamp 11 is used to fix the hydraulic pipeline to ensure that it will not shift or loosen during operation.

[0036] The pipe clamp 11 includes a pipe clamp 11 body, and the pipe clamp 11 body is made of aluminum. A through hole one for fixing the corresponding hydraulic pipeline is provided on the pipe clamp 11 body, and a fluoroplast lining 15 is provided on the inner wall of the through hole one; during use, the corresponding hydraulic pipeline passes through the through hole one and the fluoroplast lining 15. And the corresponding hydraulic pipeline is in contact with the fluoroplast lining 15. The pipe clamp 11 body is fixed to the hydraulic installation platform 1 through fasteners, and a through hole two for the fasteners to pass through is provided on the pipe clamp 11 body. And the fasteners adopt screws, and the screws pass through the through hole two and are threadedly connected to the hydraulic installation platform 1. Specifically, in the system, the pipe clamp 11 first plays a role in fixing the direction of the hydraulic pipeline to ensure the overall unity of the system pipeline layout. And because the finished products in the hydraulic system contain high-power finished pumps and loading servo devices, the vibration frequency is too high during operation, so the pipe clamp 11 is needed to fix the pipeline to eliminate vibration and ensure the stability and accuracy of the test results.

[0037] Example 3: The hydraulic pipeline now adopts 03Cr21Ni6Mn9N. The final finished product of this cold-hardened pressure-resistant non-flared connection seamless stainless steel pipe is obtained by cold rolling processing method. Among the room temperature mechanical properties, the tensile strength is 980 to 1120 Mpa, the yield strength ≥ 825 Mpa, and the elongation rate ≥ 20%. When the nominal outer diameter of the cold-hardened pressure-resistant non-flared connection seamless stainless steel pipe is less than Φ12mm and the nominal wall thickness is less than or equal to 0.5mm, the elongation rate of the cold-hardened pressure-resistant non-flared connection seamless stainless steel pipe ≥ 18%.

[0038] 03Cr21Ni6Mn9N stainless steel seamless steel pipe belongs to an austenitic stainless steel that stabilizes austenite by replacing part of Ni with Mn and N. Nitrogen has a strengthening effect, making the steel have higher toughness, extremely low magnetic permeability and a more stable austenite structure. It is suitable for making ultra-low temperature non-magnetic steel (that is, the magnetic permeability of the material is very small). Below 650 °C, this steel pipe has good oxidation resistance.

[0039] That is to say, due to the long-term high-pressure state of the hydraulic test, compared with 1Cr18Ni9Ti, 03Cr21Ni6Mn9N has better hardness and high-pressure resistance, and is less likely to leak and expand the wall.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; therefore, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present invention.

Claims

1. An aircraft hydraulic test bench test modification device, comprising a hydraulic pipeline 1 (12), a hydraulic pipeline 2 (13), a temperature sensor (4), a pressure sensor (5), and a hydraulic finished product (7), characterized in that: Also included is a test five-way joint (10); The test five-way joint (10) adopts a five-way structure, which includes a central chamber and five branch channels connected to the central chamber, and the five branch channels are all connected to the central chamber, and the free end of each branch channel is an outlet; Wherein, the first outlet is connected to the temperature sensor (4) for real-time monitoring of the temperature of the hydraulic system; The second outlet is connected to the pressure sensor (5) and is used to detect the pressure of the hydraulic system; The third outlet is connected to the hydraulic pipeline 1 (12); The fourth outlet is connected to the second hydraulic pipeline (13); The fifth outlet is connected to the hydraulic product (7).

2. The aircraft hydraulic test bench test modification device according to claim 1, characterized in that: The hydraulic pipeline 1 (12) and the hydraulic pipeline 2 (13) are made of 03Cr21Ni6Mn9N stainless steel seamless pipes.

3. The aircraft hydraulic test bench test modification device according to claim 1, characterized in that: The hydraulic pipeline one (12) and the hydraulic pipeline two (13) are both fixed on the hydraulic installation platform (1) via respective pipe clamps (11).

4. The aircraft hydraulic test bench test modification device according to claim 3, characterized in that: The pipe clamp (11) comprises a pipe clamp body (14), the pipe clamp body (14) is provided with a through hole 1 for fixing a corresponding hydraulic pipeline, and the inner wall of the through hole 1 is provided with a fluoroplastic bushing (15); when in use, the corresponding hydraulic pipeline passes through the through hole 1 and the fluoroplastic bushing (15).

5. The aircraft hydraulic test bench test modification device according to claim 4, characterized in that: The corresponding hydraulic pipeline is in contact with the fluoroplastic bushing (15).

6. The aircraft hydraulic test bench test modification device according to claim 5, characterized in that: The pipe clamp (11) body is made of aluminum.

7. The aircraft hydraulic test bench test modification device according to claim 4 or 6, characterized in that: The pipe clamp (11) body is fixed to the hydraulic installation platform (1) by means of a fastener, and a second through hole for the fastener to pass through is provided on the pipe clamp (11) body.

8. The aircraft hydraulic test bench test modification device according to claim 7, characterized in that: The fastener is a screw, which passes through the second through hole and is threadedly connected to the hydraulic installation platform (1).

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