Convection heat exchange device for heating casing
By designing a spiral-rising convection heat exchange device, the problems of slow heating speed and uneven temperature of the casing were solved, and rapid and uniform heating of the casing section was achieved, which meets the structural strength verification requirements of the aero-engine.
Patent Information
- Application Number
- CN202610184132.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-09
- Publication Date
- 2026-04-14
AI Technical Summary
Existing casing heating methods suffer from slow heating speed and uneven heating temperature, making it difficult to meet the requirements of efficient and uniform heating for aero-engine casings.
Design a convection heat exchange device, including an inner layer, an outer layer, and a guide plate, forming a spirally rising convection heat exchange cavity. The uniform distribution of hot air is achieved through the spiral channel and independent flow channels, resulting in high heating efficiency. An insulation cavity is formed between the inner and outer layers to isolate external cold air from contact, ensuring uniform heating of the casing section.
It achieves rapid and uniform heating of the casing section with good temperature uniformity, meeting the structural strength verification requirements of the aero-engine casing. The device has a simple structure and is easy to install.
Smart Images
Figure CN121855882A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of heat exchange and heat transfer equipment, specifically relating to a convection heat exchange device for heating a casing, used to achieve uniform heating of the test casing section. Background Technology
[0002] During the operation of an aero-engine, different casing sections are connected end to end, and their inner walls together form a complete outer bypass duct airflow wall. Subjected to the scouring of high-temperature and high-speed airflow, the casing must have sufficient rigidity and strength to prevent deformation and instability under high temperature conditions, so as to ensure that the engine airflow field meets the design requirements. During the operation of the engine casing, the complexity of the load-bearing structure and the load-bearing conditions of the casing make the design and evaluation of the structural strength of the casing a critical issue, and thermal fatigue testing of the casing is necessary.
[0003] In the heating test of aero-engine casing, it is necessary to heat the casing uniformly to ensure its performance during the heating test. Currently, commonly used casing heating methods include ambient chamber heating, heated plate heating, and air heating. Air heating can most realistically simulate the operating conditions of the casing compared to ambient chamber heating and heated plate heating. However, the current air heating method still has problems such as slow heating speed, the need for a large amount of high-temperature air to reach the required temperature, and poor temperature uniformity. Summary of the Invention
[0004] The purpose of this invention is to provide a convection heat exchange device for heating the casing, which has a fast heating speed and is used to achieve uniform heating of the test casing section, so as to facilitate subsequent verification of the structural strength of the test casing section.
[0005] To achieve the above objectives, the present invention provides a convection heat exchange device for casing heating, comprising a lower rotating stage, a lower inlet section, a test casing section, an upper exhaust section, and an upper rotating stage. The test casing section is disposed between the upper exhaust section and the lower inlet section. The upper exhaust section is connected to the upper rotating stage at its upper part, and the lower inlet section is connected to the lower rotating stage at its lower part. A convection heat exchange inner sleeve is also installed on the inner wall between the lower rotating stage and the upper rotating stage. The convection heat exchange inner sleeve includes an inner layer, an outer layer, and a guide plate. An insulation cavity is formed between the inner layer and the outer layer. A convection heat exchange cavity with a spiral rising channel is formed between the inner layer and the test casing section. The guide plate is fixed to the outer surface of the inner layer in a spiral rising manner. The lower rotating stage, the lower inlet section, the test casing section, the upper exhaust section, the upper rotating stage, and the convection heat exchange inner sleeve are all cylindrical structures.
[0006] Furthermore, the lower rotation stage and the lower intake stage, the lower intake stage and the test casing stage, the test casing stage and the upper exhaust stage, and the upper exhaust stage and the upper rotation stage are all connected by bolts, and sealing gaskets are provided between adjacent connection surfaces.
[0007] Furthermore, a sealing ring is provided between the surface of the inner layer and the contact surfaces of the lower and upper rotation stages.
[0008] Furthermore, the lower air intake section is provided with four air intake ports: lower air intake port one, lower air intake port two, lower air intake port three, and lower air intake port four. All four air intake ports are arranged tangentially to the outer wall surface of the lower air intake section and are used to connect with the external hot air intake pipe to introduce hot air into the casing heating test device.
[0009] Furthermore, the upper exhaust section is provided with four exhaust ports: upper exhaust section exhaust port one, upper exhaust section exhaust port two, upper exhaust section exhaust port three, and upper exhaust section exhaust port four; all four exhaust ports are arranged tangentially to the outer wall of the upper exhaust section and are used to connect with external exhaust air pipes to discharge the hot air inside the test chamber section.
[0010] Furthermore, the convection heat exchange cavity has four independent air channels, the lower end of each air channel is connected to the four air inlets of the lower air inlet section, and the upper end of each air channel is connected to the four air inlets of the upper exhaust section.
[0011] Furthermore, the cross-sectional area of each airflow channel is smaller than the cross-sectional area of the air inlet of the lower air intake section it connects to.
[0012] Furthermore, the lowering stage is fixed to the ground using bolts.
[0013] Furthermore, a spiral channel is formed on the outer surface of the convection heat exchange cavity, and the distance between two adjacent channels is 10-30mm.
[0014] Compared with the prior art, the present invention has the following advantages: 1. During heating, hot air flows along the spiral-rising convection heat exchange cavity composed of the inner layer of the convection heat exchange inner sleeve and the test casing section, thereby achieving convection heat exchange heating of the test casing section with high heating efficiency. The guide plate is fixed on the outer surface of the inner layer in a spiral-rising manner to achieve uniform heating of the test casing section.
[0015] 2. An insulation cavity is formed between the inner and outer layers, which not only has the function of heat preservation, but also isolates the air inside the convective heat exchange cavity from direct contact with the cold air outside the test casing section, so as to achieve the purpose of uniform heating of the test casing section.
[0016] 3. The lower rotation stage, lower air intake section, test casing section, upper exhaust section, upper rotation stage, and convection heat exchange inner sleeve are all cylindrical structures for easy installation and connection.
[0017] 4. The convection heat exchange chamber with spiral rising channel has four independent air flow channels. The lower end of each flow channel corresponds to the air inlet of the lower air inlet section, and the upper end of each flow channel corresponds to the exhaust port of the upper exhaust section. Furthermore, the cross-sectional area of each flow channel is smaller than the cross-sectional area of the air inlet of the corresponding lower air inlet section, thereby increasing the flow velocity of hot air in the flow channel and achieving the purpose of uniformly heating the test casing section. Attached Figure Description
[0018] Figure 1 This is a perspective view of the casing heating convection heat exchange device of the present invention; Figure 2 This is a cross-sectional view of the casing heating convection heat exchange device of the present invention; Figure 3 This is a three-dimensional view of the convection heat transfer inner sleeve of the present invention; Figure 4 This is a cross-sectional view of the convection heat exchange inner sleeve of the present invention; Figure 5 This is a temperature distribution data diagram of the casing after heating according to the present invention; Among them, 100-lower stage; 200-lower air intake section; 201-lower air intake port one; 202-lower air intake port two; 203-lower air intake port three; 204-lower air intake port four; 300-test casing section; 400-upper exhaust section; 401-upper exhaust port one; 402-upper exhaust port two; 403-upper exhaust port three; 404-upper exhaust port four; 500-upper stage; 600-convection heat exchange inner sleeve; 601-inner layer; 602-outer layer; 603-guide plate; 604-insulation cavity; 605-convection heat exchange cavity. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.
[0020] like Figure 1-4As shown, a convective heat exchange device for casing heating includes a lower rotating stage 100, a lower inlet section 200, a test casing section 300, an upper exhaust section 400, and an upper rotating stage 500. The test casing section 300 is disposed between the upper exhaust section 400 and the lower inlet section 200. The upper exhaust section 400 is connected to the upper rotating stage 500 at its upper part, and the lower inlet section 200 is connected to the lower rotating stage 100 at its lower part. A convective heat exchange inner sleeve 600 is also installed on the inner wall between the lower rotating stage 100 and the upper rotating stage 500. The inner heat exchanger 600 includes an inner layer 601, an outer layer 602, and a baffle plate 603. An insulation cavity 604 is formed between the inner layer 601 and the outer layer 602. A convection heat exchange cavity 605 with a spiral rising channel is formed between the inner layer 601 and the test casing section 300. The baffle plate 603 is fixed to the outer surface of the inner layer 601 in a spiral rising manner. The lower rotation stage 100, the lower air inlet section 200, the test casing section 300, the upper exhaust section 400, the upper rotation stage 500, and the convection heat exchanger 600 are all cylindrical structures.
[0021] Specifically: the lower rotation stage 100 and the lower air intake stage 200, the lower air intake stage 200 and the test casing stage 300, the test casing stage 300 and the upper exhaust stage 400, and the upper exhaust stage 400 and the upper rotation stage 500 are connected by bolts, and sealing gaskets are provided between adjacent connection surfaces to ensure the airtightness of the casing cavity.
[0022] A sealing ring is also provided between the surface of the inner layer 601 and the contact surfaces of the lower turning stage 100 and the upper turning stage 500 to prevent leakage of heated air.
[0023] The lower stage 100 is typically bolted to a support base, such as the ground, to secure the entire casing heating device.
[0024] The lower air intake section 200 is provided with four air intake ports: lower air intake port one 201, lower air intake port two 202, lower air intake port three 203, and lower air intake port four 204. All four air intake ports are arranged tangentially to the outer wall surface of the lower air intake section 200 and are used to connect with external hot air intake pipes to introduce hot air into the casing heating test device.
[0025] The upper exhaust section 400 is provided with four exhaust ports: upper exhaust section exhaust port one 401, upper exhaust section exhaust port two 402, upper exhaust section exhaust port three 403 and upper exhaust section exhaust port four 404. The four exhaust ports are arranged tangentially to the outer wall of the upper exhaust section 400 and are used to connect with the external exhaust air pipe to discharge the hot air in the test casing section.
[0026] Specifically, the convection heat exchange inner sleeve 600 consists of an inner layer 601, an outer layer 602, and a guide plate 603. The inner layer 601, the middle layer 602, and the guide plate 603 are fixed together by welding. The convection heat exchange inner sleeve 600 contains two cavities, namely an insulation cavity 604 formed between the inner layer 601 and the outer layer 602. The insulation cavity formed between the inner and outer layers not only has a heat preservation function but also isolates the air inside the convection heat exchange cavity from direct contact with the cold air outside the test casing section, thereby achieving the purpose of uniform heating of the test casing section.
[0027] A spirally rising convection heat exchange cavity 605 is formed by an inner layer 601 and a test casing section 300. A guide plate 603 is welded to the outer surface of the inner layer 601 in a spirally rising manner. The outer surface of the convection heat exchange cavity 605 forms a spiral channel, with a distance of 10-30 mm between adjacent channels. During heating, hot air flows along the spirally rising convection heat exchange cavity formed by the inner layer of the convection heat exchange inner sleeve and the test casing section, achieving convective heat exchange heating of the test casing section with high heating efficiency. The guide plate is fixed to the outer surface of the inner layer in a spirally rising manner to achieve uniform heating of the test casing section.
[0028] The convection heat exchange cavity 605 has four independent air channels. The lower end of each air channel is connected to the four air inlets of the lower air inlet section 200, and the upper end of each air channel is connected to the four air inlets of the upper exhaust section 400. The cross-sectional area of each air channel is smaller than the cross-sectional area of the air inlet of the lower air inlet section 200 to which it is connected, thereby increasing the flow velocity of hot air in the channel and achieving the purpose of uniformly heating the test casing section.
[0029] The working process of the casing heating convection heat exchange device of the present invention is as follows: Before the test begins, the hot air pipeline needs to be connected to the lower air inlet 201, lower air inlet 202, lower air inlet 303, and lower air inlet 404; the exhaust pipeline needs to be connected to the upper exhaust outlet 401, upper exhaust outlet 402, upper exhaust outlet 303, and upper exhaust outlet 404. Hot air is introduced into the test casing section from the lower air inlet 200. The hot air flows along the spirally rising convection heat exchange cavity 605 formed by the inner layer 601 of the convection heat exchange inner sleeve 600 and the test casing section 300, thereby achieving convection heat exchange heating of the test casing section 300; finally, the hot air flows into the exhaust pipeline from the four exhaust outlets (upper exhaust outlet 401, upper exhaust outlet 202, upper exhaust outlet 303, and upper exhaust outlet 404) on the upper exhaust section 400. The intake pipe continuously supplies hot air, which, through the above process, continuously heats the test casing section 300, raising the overall temperature of the test casing section 300 and ultimately achieving uniform heating of the test casing section 300.
[0030] After the test, the hot air is replaced with cold air. Through the above process, the cold air can quickly cool down the test casing section 300.
[0031] By controlling the temperature of the air in the intake pipe, the heating temperature of the test casing section 300 can be controlled, thereby realizing the alternating cycle test conditions of high temperature and low temperature heating of the test casing section 300.
[0032] When the test casing is heated to the required temperature, the temperature of the upper and lower ends of the test casing section 300 transitions uniformly. The upper end of the casing is between 342.5℃ and 348.5℃, and the lower end is between 358.5℃ and 365℃. The temperature difference of the test casing section 300 is within the required range, indicating that the casing heating convection heat exchange device can achieve uniform heating of the casing and solve the problem of uneven heating of the casing by hot air.
Claims
1. A convection heat exchange device for heating a casing, characterized in that, It includes a lower rotation stage (100), a lower intake section (200), a test casing section (300), an upper exhaust section (400), and an upper rotation stage (500). The test casing section (300) is located between the upper exhaust section (400) and the lower intake section (200). The upper exhaust section (400) is connected to the upper rotation stage (500) at its upper part, and the lower intake section (200) is connected to the lower rotation stage (100) at its lower part. A convection heat exchange inner sleeve (600) is also installed on the inner wall between the lower rotation stage (100) and the upper rotation stage (500). The convection heat exchange inner sleeve (600) includes an inner layer ( The inner layer (601), outer layer (602), and guide plate (603) form an insulation cavity (604) between the inner layer (601) and the outer layer (602). A convection heat exchange cavity (605) with a spiral rising channel is formed between the inner layer (601) and the test casing section (300). The guide plate (603) is fixed on the outer surface of the inner layer (601) in a spiral rising manner. The lower rotation stage (100), lower air inlet section (200), test casing section (300), upper exhaust section (400), upper rotation stage (500), and convection heat exchange inner sleeve (600) are all cylindrical structures.
2. The convection heat exchange device for casing heating according to claim 1, characterized in that, The lower turning stage (100) and the lower air intake section (200), the lower air intake section (200) and the test casing section (300), the test casing section (300) and the upper exhaust section (400), and the upper exhaust section (400) and the upper turning stage (500) are all connected by bolts, and sealing gaskets are provided between adjacent connecting surfaces.
3. A convection heat exchange device for casing heating according to claim 1, characterized in that, A sealing ring is also provided between the surface of the inner layer (601) and the contact surfaces of the lower turning stage (100) and the upper turning stage (500).
4. A convection heat exchange device for casing heating according to claim 2, characterized in that, The lower air intake section (200) is provided with four air intake ports: lower air intake port one (201), lower air intake port two (202), lower air intake port three (203) and lower air intake port four (204); the four air intake ports are arranged tangentially to the outer wall surface of the lower air intake section (200) and are used to connect with the external hot air intake pipe to introduce hot air into the test casing section.
5. A convection heat exchange device for casing heating according to claim 2, characterized in that, The upper exhaust section (400) is provided with four exhaust ports: upper exhaust port one (401), upper exhaust port two (402), upper exhaust port three (403), and upper exhaust port four (404); the four exhaust ports are arranged tangentially to the outer wall of the upper exhaust section (400) and are used to connect with the external exhaust air pipe to discharge the hot air in the test casing section.
6. A convection heat exchange device for casing heating according to any one of claims 4 or 5, characterized in that, The convection heat exchange cavity (605) has four independent air channels. The lower end of each air channel is connected to the four air inlets of the lower air inlet section (200), and the upper end of each air channel is connected to the four air inlets of the upper exhaust section (400).
7. A convection heat exchange device for casing heating according to claim 6, characterized in that, The cross-sectional area of each airflow channel is smaller than the cross-sectional area of the air inlet of the lower air intake section (200) connected to it.
8. A convection heat exchange device for casing heating according to claim 1, characterized in that, The lowering stage (100) is fixed to the ground using bolts.
9. A convection heat exchange device for casing heating according to claim 1, characterized in that, The outer surface of the convection heat exchange cavity (605) forms a spiral channel, and the distance between two adjacent channels is 10-30mm.