High-temperature-resistant fireproof sound-absorbing emission chimney for aviation turbojet engine test room

Abstract

The utility model relates to the technical field of aero-engine testing equipment, and discloses a high-temperature-resistant fireproof sound-absorbing emission chimney for a testing room of an aero-turbojet engine, which comprises a chimney and a filler placed in the chimney, the steel mesh is wound and fixed on the outer side of the steel bar rib frame; the first high-temperature-resistant fireproof non-woven fabric layer is wrapped on the outer side of the steel mesh; the sound-absorbing and heat-insulating cotton is wound and wrapped on the outer side of the first high-temperature-resistant fireproof non-woven fabric layer; and the second high-temperature-resistant fireproof non-woven fabric layer wraps and fixes the sound absorption and heat insulation cotton. The filler is placed in the chimney, so that the chimney has the functions of noise reduction, shock absorption and heat insulation.

Description

TECHNICAL FIELD

[0001] The utility model relates to aero -engine test equipment technical field more specifically, especially, it is a kind of aero -jet engine test room high temperature fireproof sound-absorbing exhaust chimney. BACKGROUND

[0002] Aero -jet engine test room tail gas exhaust chimney is the key facility of engine performance test, its core function is to guide the tail gas of high temperature, high pressure to outdoor safely, simultaneously need to bear the violent vibration and high frequency noise generated when engine operates.In the field of aviation industry, the stability and functionality of chimney directly affect the accuracy of test data and surrounding environment compliance.

[0003] Prior art is through welding chimney, installs elbow, directly from test room broken top to outdoor, there is no any filling in pipe, relies on a stainless steel pipe to carry out engine tail gas discharge, noisy, vibration, influence surrounding residential environment and other problems.

[0004] Therefore, there is a kind of aero -jet engine test room high temperature fireproof sound-absorbing exhaust chimney that can solve a series of problems such as noisy, vibration, disturb people and other problems when aero -jet engine whole machine test. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of aero -jet engine test room high temperature fireproof sound-absorbing exhaust chimney, to solve the problems existing in prior art, by placing filler in chimney, can make chimney have the function of noise reduction, shock absorption and heat insulation.

[0006] To achieve the above object, the utility model provides the following scheme: the utility model provides a kind of aero -jet engine test room high temperature fireproof sound-absorbing exhaust chimney, comprising: chimney and the filler placed in the chimney, the filler includes: steel rib frame;Steel net, the steel net is fixed by winding on the outer side of the steel rib frame;First high temperature fireproof non-woven fabric layer, the first high temperature fireproof non-woven fabric layer is wrapped in the outer side of the steel net;Sound-absorbing heat insulation cotton, the sound-absorbing heat insulation cotton is wrapped in the outer side of the first high temperature fireproof non-woven fabric layer;Second high temperature fireproof non-woven fabric layer, second high temperature fireproof non-woven fabric layer is wrapped and fixed the sound-absorbing heat insulation cotton.

[0007] According to the utility model provides a kind of aero -jet engine test room high temperature fireproof sound-absorbing exhaust chimney, the steel rib frame includes several steel reinforcement rings and several steel rib bones, several steel reinforcement rings are same in diameter, the steel rib bone is evenly distributed along the outer circumferential side of the steel reinforcement ring, and is fixedly connected with the steel reinforcement ring.

[0008] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, the steel net includes first steel net and second steel net, the first steel net is 12mm mesh's thick net, the second steel net is 3mm mesh's fine net.

[0009] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, the first steel net is fixed by winding at the outer side of the reinforcing ring and reinforcing rib, and the second steel net is fixed by winding at the outer side of the first steel net.

[0010] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, the first high temperature resistant fireproof non-woven fabric layer is fixed by winding at the outer side of second steel net.

[0011] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, the first steel net is fixed by stainless steel wire binding on the reinforcing ring and the reinforcing rib, and the second steel net is fixed by stainless steel wire staggered winding between the first steel net.

[0012] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, the filler top is fixed in the top of the chimney by first flange, and the filler bottom is fixed in the bottom of the chimney by second flange.

[0013] The utility model provides a kind of aviation turbojet engine test room high temperature resistant fireproof sound absorption emission chimney, and the chimney bottom is provided with a drain valve.

[0014] The utility model discloses the following technical effects:

[0015] The device is fixedly installed with filler in the chimney, the filler is the composite filling structure of reinforcing ring rib frame, steel net, high temperature resistant fireproof non-woven fabric layer and sound absorption heat insulation cotton, plays the role of noise reduction, shock absorption and heat insulation, to make the chimney have noise reduction, shock absorption and heat insulation function. DRAWINGS DESCRIPTION

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be briefly introduced to the drawing needed to be used in the embodiment, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2The utility model discloses a reinforcing rib framework structure schematic diagram for the utility model;

[0019] Figure 3 The utility model discloses a filler side wall section view for the utility model;

[0020] Figure 4 The utility model discloses a first steel net structure schematic diagram for the utility model;

[0021] Figure 5 The utility model discloses a second steel net structure schematic diagram for the utility model;

[0022] Figure 6 The utility model discloses a sound-absorbing and heat-insulating cotton structure schematic diagram for the utility model;

[0023] 1, smoke stack, 2, reinforcing ring, 3, reinforcing rib, 4, first steel net, 5, second steel net, 6, first high-temperature-resistant fireproof non-woven fabric layer, 7, sound-absorbing and heat-insulating cotton, 8, second high-temperature-resistant fireproof non-woven fabric layer, 9, first flange, 10, second flange, 11, water release valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative work belong to the protection scope of the utility model.

[0025] In the following embodiments, the aviation turbojet engine test room is involved. The aviation turbojet engine test room is a closed facility specially used for testing the performance of aviation turbojet engines. Its core function is to simulate the actual working environment of the engine and systematically test key parameters such as thrust, fuel consumption, vibration, and noise. The test room is usually equipped with high-precision sensors, exhaust treatment systems, and safety protection devices to ensure that the testing process meets the requirements of the "Air Engine Airworthiness Regulations" (such as CCAR-33-R2). The technical features are: environmental control: through heat insulation, noise reduction structure (such as sound-absorbing wall, shock-absorbing foundation) to reduce external interference and ensure the accuracy of test data. Exhaust system: equipped with high-temperature-resistant (≥800℃) smoke stack for safe discharge of high-temperature exhaust gas (containing CO, NOx, and other pollutants). Safety specification: need to meet the requirements of GB 50157-2013 "Design Specification for Aviation Engine Test Stand" on fire prevention, explosion prevention, and emergency shutdown.

[0026] Also related to the test chamber exhaust chimney, the test chamber exhaust chimney is a special pipeline connecting the aviation turbojet engine tail nozzle and the external atmosphere, used for directional discharge of high-temperature (500-1000℃) and high-pressure tail gas generated during engine testing. Its core role is to prevent backflow of tail gas, reduce noise and heat radiation pollution. Structure composition: main material: 316L stainless steel (resistant to high temperature and corrosion), wall thickness ≥3mm. Functional design: noise reduction: reduce noise to below 85dB (GB 12348-2008 standard) through internal filler (such as sound-absorbing cotton). Heat insulation: double-layer structure or composite heat insulation layer (such as aluminum silicate fiber cotton), surface temperature ≤80℃. Drainage: bottom manual ball valve (DN50) is provided to prevent rainwater accumulation from causing corrosion.

[0027] High-temperature non-woven fabric, high-temperature non-woven fabric is a non-woven material made of ceramic fiber or glass fiber as the base material, which can be used in high-temperature environment of 800-1200℃ for a long time, and has fireproof, heat insulation and mechanical strength. Performance: temperature resistance: continuous working temperature ≥800℃ (GB / T 3003-2017 standard). Fireproof grade: A-class non-combustible material (GB 8624-2012). Mechanical strength: tensile strength ≥50MPa, used to fix sound-absorbing cotton and resist airflow erosion. Application scenario: wrapping sound-absorbing and heat-insulating cotton in the exhaust chimney to prevent fiber shedding and block direct heat radiation of high-temperature tail gas to the metal pipe wall.

[0028] High-temperature fireproof sound-absorbing and heat-insulating cotton, high-temperature fireproof sound-absorbing and heat-insulating cotton is a porous material made of aluminum silicate fiber as the main body through wet forming process, which has sound-absorbing (noise reduction), heat-insulating (flame-retardant) and shock-absorbing functions, suitable for high-temperature and high-noise environment. Sound-absorbing performance: noise reduction coefficient (NRC) ≥0.8 (GB / T 20247-2006), can absorb more than 120dB high-frequency sound waves. Heat-insulating performance: thermal conductivity coefficient ≤0.12W / (m·K) (GB / T 10294-2008), temperature resistance ≥1000℃. Fireproof performance: meets UL 94V-0 level flame retardant standard, oxygen index ≥28%. Structural design: density: 80kg / m 3 (optimize sound-absorbing and weight reduction balance). Installation method: axially continuously wrapped outside the steel reinforcement framework, fixed by double-layer non-woven fabric, to avoid airflow erosion causing structure loosening.

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below combined with the drawings and specific embodiments.

[0030] As Figures 1-6As shown, this utility model provides a high-temperature resistant, fireproof, and sound-absorbing exhaust chimney for an aircraft turbojet engine test chamber, comprising: a chimney 1 and a filling material placed inside the chimney 1, the filling material comprising: a steel rib frame; a steel mesh, the steel mesh being wound and fixed on the outside of the steel rib frame; a first high-temperature resistant and fireproof non-woven fabric layer 6, the first high-temperature resistant and fireproof non-woven fabric layer 6 being wrapped around the outside of the steel mesh; sound-absorbing and heat-insulating cotton 7, the sound-absorbing and heat-insulating cotton 7 being wound and wrapped around the outside of the first high-temperature resistant and fireproof non-woven fabric layer 6; and a second high-temperature resistant and fireproof non-woven fabric layer 8, the second high-temperature resistant and fireproof non-woven fabric layer 8 being wrapped around and fixed to the sound-absorbing and heat-insulating cotton 7.

[0031] This device not only functions as a chimney for emissions, but also utilizes its design to thicken the diameter of the chimney 1. A filling material is then placed inside the thickened chimney 1, providing noise reduction, vibration damping, fireproofing, and heat insulation. This results in the chimney 1 possessing these functions. The chimney 1 in this device is made of stainless steel.

[0032] The steel reinforcement rib cage includes several steel reinforcement rings 2 and several steel reinforcement ribs 3. The steel reinforcement rings 2 are circular structures of the same size made of steel bars with a diameter of 10mm. The diameter of the steel reinforcement rings 2 is smaller than that of the chimney 1, and the diameter of the steel reinforcement rings 2 is about 55cm. The distance between adjacent steel reinforcement rings 2 is maintained at about 65cm. The purpose of the distance between the steel reinforcement rings 2 is to ensure that the 1m wide steel mesh can be staggered, wrapped, overlap and interconnected, and to ensure the overall rigidity of the steel reinforcement rib cage, so that the steel reinforcement rib cage is not easily deformed. In this embodiment, there are 4 steel reinforcement ribs 3, which are evenly distributed around the steel reinforcement rings 2 by welding. The included angle between adjacent steel reinforcement ribs 3 is 90°.

[0033] In this embodiment, the steel mesh is a stainless steel mesh, which includes a first steel mesh 4 and a second steel mesh 5. The first steel mesh 4 is a coarse mesh with a mesh size of 12mm*12mm. The steel wire is thicker and has higher hardness. The first steel mesh 4 is wrapped around the reinforcing steel rib skeleton and fixed to the reinforcing steel ring 2 and the reinforcing steel rib 3 with stainless steel wire to prevent the reinforcing steel rib skeleton from deforming later and causing obstruction of waste discharge. The second steel mesh 5 is a fine mesh with a mesh size of 3mm*3mm. It is relatively soft and plays a role in ensuring that the sound-absorbing and heat-insulating cotton 7 is not blown away and falls off.

[0034] The first high-temperature resistant fireproof nonwoven fabric layer 6 is wrapped and fixed to the outside of the second steel mesh 5 to form the first high-temperature resistant fireproof nonwoven fabric layer 6. The high-temperature resistant fireproof nonwoven fabric has the functions of high temperature resistance, flame retardancy and good air permeability.

[0035] The sound-absorbing and heat-insulating cotton 7 is high-density high-temperature-resistant fireproof sound-absorbing cotton, and the sound-absorbing and heat-insulating cotton 7 is wound and wrapped block by block to cover the first high-temperature-resistant fireproof non-woven fabric layer 6, and the second high-temperature-resistant fireproof non-woven fabric layer 8 is used to wind and compress the sound-absorbing and heat-insulating cotton 7, the winding is compact, and the overall diameter of the barrel-shaped filler with the sound-absorbing and heat-insulating cotton 7 wound is ensured to be little different. The first high-temperature-resistant fireproof non-woven fabric layer 6 and the second high-temperature-resistant fireproof non-woven fabric layer 8 are arranged in the sound-absorbing and heat-insulating cotton 7 respectively, so that the sound-absorbing and heat-insulating cotton can be prevented from being blown away and falling off due to strong wind during engine test. During engine test, smoke, noise and vibration can be absorbed and filtered by the high-temperature-resistant fireproof sound-absorbing and heat-insulating cotton 7, so that the effects of noise reduction, vibration reduction and heat insulation can be effectively achieved, and the high-temperature-resistant fireproof sound-absorbing and heat-insulating cotton 7 plays a very important role in environmental governance.

[0036] After the second high-temperature-resistant fireproof non-woven fabric layer 8 is wound, the complete filler is formed, the length of the filler is consistent with the length of the chimney 1, the length of the chimney 1 is 9 m in the vertical direction, the chimney 1 is pulled into the chimney 1 by using an island chain, the top of the filler is fixed at the top of the chimney 1 by the first flange 9 and bolts, and the bottom of the filler is fixed at the bottom of the chimney 1 by the second flange 10 and bolts. The first flange 9 and the second flange 10 are arranged to facilitate maintenance and disassembly in the later period.

[0037] Since the chimney 1 is installed in the open air, rainwater may flow into the chimney in rainy days, so a drain valve 11 is welded at the lowest end of the bottom elbow of the chimney to timely drain the accumulated water.

[0038] A detection window is arranged at a position about 2.5 m below the top of the chimney 1, the opening penetrates the chimney 1 and the filler, a stainless steel plate is connected to the opening by a hinge and rotates, in a normal state, the stainless steel plate blocks the opening, and when the noise reduction and vibration reduction effects need to be detected, the stainless steel plate is opened to detect the inside of the chimney 1.

[0039] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell, characterized in that, The application relates to a chimney (1) and a filler placed in the chimney (1), wherein the filler comprises: a steel rib framework; a steel mesh fixed on the outside of the steel rib framework; a first high-temperature-resistant fireproof non-woven fabric layer (6) wrapped on the outside of the steel mesh; sound-absorbing and heat-insulating cotton (7) wrapped on the outside of the first high-temperature-resistant fireproof non-woven fabric layer (6); a second high-temperature-resistant fireproof non-woven fabric layer (8) wrapping and fixing the sound-absorbing and heat-insulating cotton (7). The steel rib framework comprises a plurality of steel ring (2) and a plurality of steel rib bones (3), the steel ring (2) has the same diameter, the steel rib bones (3) are uniformly distributed along the outer circumferential side of the steel ring (2) and are fixedly connected with the steel ring (2).

2. The high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell according to claim 1, characterized in that: The steel mesh comprises a first steel mesh (4) and a second steel mesh (5), the first steel mesh (4) is a coarse mesh with a mesh hole of 12 mm, and the second steel mesh (5) is a fine mesh with a mesh hole of 3 mm.

3. The high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell according to claim 2, characterized in that: The first steel mesh (4) is fixed on the outside of the steel ring (2) and the steel rib bones (3), and the second steel mesh (5) is fixed on the outside of the first steel mesh (4).

4. The high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell according to claim 3, characterized in that: The first high-temperature-resistant fireproof non-woven fabric layer (6) is fixed on the outside of the second steel mesh (5).

5. The high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell according to claim 4, characterized in that: The first steel mesh (4) is fixed on the steel ring (2) and the steel rib bones (3) through stainless steel wire binding, and the second steel mesh (5) is fixed on the first steel mesh (4) through stainless steel wire staggered winding.

6. The high temperature resistant fireproof sound absorbing and discharging chimney for aviation turbojet engine test cell according to claim 3, characterized in that: The top of the filler is fixed in the top of the chimney (1) through a first flange (9), and the bottom of the filler is fixed in the bottom of the chimney (1) through a second flange (10).

7. The high temperature resistant fire rated sound absorbing exhaust stack for jet engine test cell according to claim 1, wherein: The bottom of the chimney (1) is provided with a water drain valve.

8. The high temperature resistant fire rated sound absorbing exhaust stack for jet engine test cell according to claim 1, wherein: ​

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