Optical test section for a double glazing

Abstract

The application belongs to the technical field of optical non-contact measurement, and particularly relates to an optical test test section of a double-layer observation window, which comprises an outer cavity, an inner cavity, an observation window and a blowing device; an outer cavity for cooling airflow circulation is formed between the inner cavity and the outer cavity, and the inner cavity has an inner cavity for high-temperature and high-pressure test airflow circulation; the blowing device comprises a blowing inlet pipe, a fixed wall and a mounting plate; the mounting plate comprises a mounting cylinder and a mounting edge located at one end surface of the mounting cylinder, the mounting edge is sleeved on the inner side of the inner cavity, the fixed wall is mounted between the mounting cylinder and the inner cavity, the fixed wall, the mounting cylinder, the inner cavity and the mounting edge form a blowing cavity, the fixed wall is provided with an air inlet hole, the blowing inlet pipe is connected with the air inlet hole on the fixed wall through the outer cavity and the inner cavity, blowing gas is introduced into the blowing cavity, the mounting edge and the inner wall of the inner cavity form a blowing air gap, and the gas in the blowing cavity is blown to the observation window through the blowing air gap.

Description

Technical Field

[0001] This application belongs to the field of optical non-contact measurement technology, and specifically relates to an optical test section with a double-layer observation window. Background Technology

[0002] In recent years, optical non-contact measurement technology has been widely used in gas flow measurement. It can currently measure high-temperature and high-pressure flow fields in real time, but it lacks a visual test section that can perform high-temperature and high-pressure optical experiments.

[0003] Currently, the observation window of the optical visualization test section is mainly a single-layer glass structure.

[0004] Existing optical visualization test sections primarily use single-layer glass observation windows, which have the following drawbacks: 1) They can only be used for heating tests at room temperature or lower temperatures; 2) The observation windows are easily contaminated; 3) There is no effective solution for the thermal expansion of the test section caused by high-temperature airflow; 4) The sealing plate mainly prevents large-scale leakage of cooling flow and allows the internal structure to extend freely backward after thermal expansion at high temperatures. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an optical test section with a double-layered observation window, comprising an outer cavity, an inner cavity, an observation window, and a purging device;

[0006] The inner cavity is fitted inside the outer cavity, and the inner cavity and the outer cavity form an outer cavity for cooling airflow. The inner cavity has an inner cavity for high temperature and high pressure test airflow.

[0007] The observation window includes multiple viewing glasses installed on the outer cavity and the inner cavity;

[0008] The purging device includes a purging inlet pipe, a fixed wall, and a mounting plate. The mounting plate includes a mounting cylinder and a mounting edge located on one end face of the mounting cylinder. The mounting edge is fitted inside the inner cavity. The fixed wall is installed between the mounting cylinder and the inner cavity. The fixed wall, mounting cylinder, inner cavity, and mounting edge form a purging chamber. The fixed wall has an air inlet hole. The purging inlet pipe passes through the outer cavity and connects to the air inlet hole on the fixed wall of the inner cavity to introduce purging gas into the purging chamber. The mounting edge has a notch at the location of the observation window in the inner cavity. The notch and the inner wall of the inner cavity form a purging gas slit. The gas in the purging chamber is blown toward the observation window through the purging gas slit.

[0009] Preferably, the purge air outlet has a purge air curtain, one side of which has a sawtooth structure. The sawtooth structure forms an equally spaced airflow gap with the outer cavity, so that the purge air flowing out of the purge air outlet is blown toward the observation window through the airflow gap.

[0010] Preferably, a cooling air inlet pipe and a cooling air return pipe are installed on the outer cavity. The cooling airflow enters the outer cavity through the cooling air inlet pipe and then flows out through the cooling air return pipe.

[0011] Preferably, the end face of the air inlet of the outer cavity has multiple circumferentially distributed internal threaded holes, and the end face of the exhaust of the outer cavity is fixed with a rear pressure plate by bolts, and an annular sealing pressure plate is fixed at the end of the rear pressure plate.

[0012] The air inlet end of the inner cavity has a mounting flange, which is fixed in the internal threaded hole of the outer cavity by bolts. The exhaust end of the inner cavity is fitted inside the sealing pressure plate, and there is an annular gap between the sealing pressure plate and the inner cavity.

[0013] Preferably, the inner cavity has a gradually narrowing section near the exhaust end, and a guide slope is installed on the outer cavity to form an equally spaced channel with the narrowing section. Multiple evenly distributed vertical holes are opened on the guide slope. The guide slope, the outer cavity, and the rear pressure plate form an air intake chamber, and the cooling air intake pipe is connected to the air intake chamber.

[0014] Preferably, the observation window includes a large observation window and a small observation window installed in different positions, with the large observation window having a larger transparent area than the small observation window.

[0015] Preferably, the large observation window includes an outer large observation window and an inner large observation window. The outer large observation window is fixed to the outer large observation window mounting base by a stop and an outer large observation window cover. The outer large observation window mounting base is fixed to the outer cavity by bolts. The inner large observation window is fixed to the inner cavity by a stop that matches the inner cavity and an inner observation window cover.

[0016] Preferably, the small observation window includes an outer small observation window and an inner observation window cover; the outer small observation window is fixed to the outer small observation window mounting base by the outer small observation window cover, and the outer small observation window mounting base is fixed to the outer cavity by bolts; the inner small observation window is embedded in the inner small observation window clamping plate, and then fixed to the inner small observation window adapter plate by the inner small observation window cover; the inner small observation window adapter plate is fixed to the inner cavity by the inner small observation window cover.

[0017] Preferably, the cross-section of the optical test section is rectangular.

[0018] The advantages of this application include: 1) It can withstand the high temperature and high pressure airflow of the test section; 2) It effectively avoids the problem of contamination of the observation window; 3) It effectively solves the problem of thermal expansion caused by high temperature airflow in the test section; 4) The main function of the sealing plate is to prevent a large amount of cooling flow leakage and to allow the inner tube to extend freely backward after thermal expansion at high temperature. Attached Figure Description

[0019] Figure 1 A half-section view of an optical test section with a double-layer observation window;

[0020] Figure 2 for Figure 1 AA perspective view;

[0021] Figure 3 A schematic diagram of the scavenging curtain structure for the purge flow;

[0022] Figure 4 This is a schematic diagram of the sealing pressure plate structure;

[0023] Figure 5 This is a schematic diagram of the cooling gas inlet circuit. Detailed Implementation

[0024] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0025] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0026] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0027] A test section for high-temperature, high-pressure optical testing, see Figure 1 Its main functional principles are as follows: a) To improve the temperature and pressure resistance of the optical test section, the test section is designed with an inner and outer two-layer structure. The inner cavity is a high-temperature, high-pressure test airflow, and the outer cavity is a normal-temperature, high-pressure cooling airflow. The inner and outer cavities achieve pressure balance. Therefore, the outer cavity and outer observation window only bear the high pressure of the cooling airflow, while the inner cavity and inner observation window only bear the high temperature of the test airflow. Moreover, the outer wall of the inner cavity and inner observation window is a cooling flow, which greatly improves its temperature resistance; b) To avoid the contamination problem of the inner observation window, a purge air curtain structure is designed to accelerate the purge flow and effectively extend the purge length of the airflow, forming an air film on the surface of the inner observation window to isolate the inner observation window from the mainstream; c) To solve the problem of thermal expansion caused by the high-temperature airflow in the test section, a sealing pressure plate structure is designed with a small gap in the circumferential direction, allowing the thermal expansion caused by the high temperature in the test section to extend freely.

[0028] An optical test section with a double-layer observation window, comprising an outer cavity 10, an inner cavity 5, an observation window, and a purging device;

[0029] The inner cavity 5 is fitted inside the outer cavity 10, and the inner cavity 5 and the outer cavity 10 form an outer cavity for cooling airflow. The inner cavity 5 has an inner cavity for high temperature and high pressure test airflow.

[0030] The observation window includes multiple viewing glasses mounted on the outer cavity 10 and the inner cavity 5;

[0031] The purging device includes a purging inlet pipe 1, a fixed wall 2, and a mounting plate 3. The mounting plate 3 includes a mounting cylinder and a mounting edge located on one end face of the mounting cylinder. The mounting edge is fitted inside the inner cavity 5. The fixed wall 2 is installed between the mounting cylinder and the inner cavity 5. The fixed wall 2, the mounting cylinder, the inner cavity 5, and the mounting edge form a purging chamber. The fixed wall 2 has an air inlet hole. The purging inlet pipe 1 passes through the outer cavity 10 and connects to the air inlet hole on the inner cavity 5 and the fixed wall 2 to introduce purging gas into the purging chamber. The mounting edge has a notch at the location where the inner cavity 5 has an observation window. The notch and the inner wall of the inner cavity 5 form a purge air slit. The gas in the purge chamber is blown toward the observation window through the purge air slit. The purge air slit outlet has a purge air curtain 4. One side of the purge air curtain 4 has a sawtooth structure. The sawtooth structure and the outer cavity 10 form an equally spaced airflow gap, so that the purge air flowing out of the purge air slit is blown toward the observation window through the airflow gap. Furthermore, the purge air inlet pipe 1 is supported and fixed by the fixed wall 2. The fixed wall 2 is welded together with the outer cavity 10 and the mounting plate 3. The purge air curtain 4 has a sawtooth structure and is welded to the fixed wall 2.

[0032] The outer cavity 10 has an overall wall thickness of 50mm. It has temperature mounting holes, air inlet holes, air return holes, and rectangular holes for mounting visual glass. After the entire process is completed, a fluorescence inspection is required, and cracks are not allowed.

[0033] The outer cavity 10 is equipped with a cooling flow inlet pipe 9 and a cooling flow return pipe 11. After the cooling flow enters the outer cavity through the cooling flow inlet pipe 9, it flows out through the cooling flow return pipe 11. The cooling flow inlet pipe 9 and the cooling flow return pipe 11 are equipped with pressure and temperature measuring points.

[0034] Preferably, the end face of the air inlet of the outer cavity 10 has multiple circumferentially distributed internal threaded holes, and the end face of the exhaust of the outer cavity 10 is fixed with a rear pressure plate 8 by bolts, and an annular sealing pressure plate 7 is fixed at the end of the rear pressure plate 8; the bolts lie inside the rear pressure plate 8.

[0035] The air inlet end of the inner cavity 5 has a mounting flange, which is fixed in the internal threaded hole of the outer cavity 10 by bolts. The exhaust end of the inner cavity 5 is fitted inside the sealing pressure plate 7. There is an annular gap between the sealing pressure plate 7 and the inner cavity 5. Furthermore, the annular gap is formed by the 1mm gap left between the sealing pressure plate 7 and the inner cavity 5.

[0036] Preferably, the inner cavity 5 has a gradually contracting section near the exhaust end, and a guide slope 6 is installed on the outer cavity 10 to form a channel with equal spacing to the contracting section. Multiple evenly distributed vertical holes are opened on the guide slope 6. The guide slope 6, the outer cavity 10 and the rear pressure plate 8 form an air intake chamber. The cooling flow air intake pipe 9 is connected to the air intake chamber. Furthermore, the guide slope 6 is a thin metal wall, and its distance from the inner cavity 5 remains constant. It is fixed by the bosses of the outer cavity 10 and the rear pressure plate 8.

[0037] Preferably, the observation window includes a large observation window and a small observation window installed in different positions, with the large observation window having a larger transparent area than the small observation window.

[0038] Preferably, the large observation window includes an outer large observation window 17 and an inner large observation window 19. The outer large observation window 17 is fixed to the outer large observation window mounting base 15 by a stop and an outer large observation window cover 16. The outer large observation window mounting base 15 is fixed to the outer cavity 10 by bolts. The inner large observation window 19 is fixed to the inner cavity 5 by a stop that matches the inner cavity 5 and an inner observation window cover 18.

[0039] Preferably, the small observation window includes an outer small observation window 14 and an inner observation window cover 18; the outer small observation window 14 is fixed to the outer small observation window mounting base 12 by the outer small observation window cover 13, the outer small observation window mounting base 12 is fixed to the outer cavity 10 by bolts, the inner small observation window 21 is embedded in the inner small observation window clamping plate 20, and then fixed to the inner small observation window adapter plate 22 by the inner small observation window cover 18, the inner small observation window adapter plate 22 is fixed to the inner cavity 5 by the inner small observation window cover 18.

[0040] It is permissible that the cross-section of the optical test section is rectangular:

[0041] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical test section with a double-layer observation window, characterized in that, The outer cavity (10), the inner cavity (5), the observation window, and the purging device; The inner cavity (5) is fitted inside the outer cavity (10), and the inner cavity (5) and the outer cavity (10) form an outer cavity for cooling airflow. The inner cavity (5) has an inner cavity for high temperature and high pressure test airflow. The observation window includes multiple viewing glasses mounted on the outer cavity (10) and the inner cavity (5); The purging device includes a purging inlet pipe (1), a fixed wall (2), and a mounting plate (3). The mounting plate (3) includes a mounting cylinder and a mounting edge located on one end face of the mounting cylinder. The mounting edge is fitted inside the inner cavity (5). The fixed wall (2) is installed between the mounting cylinder and the inner cavity (5). The fixed wall (2), the mounting cylinder, the inner cavity (5), and the mounting edge form a purging cavity. The fixed wall (2) has an air inlet hole. The purging inlet pipe (1) passes through the outer cavity (10) and connects to the air inlet hole on the inner cavity (5) and the fixed wall (2) to introduce purging gas into the purging cavity. The mounting edge has a notch at the position where the inner cavity (5) has an observation window. The notch and the inner wall surface of the inner cavity (5) form a purging gas slit. The gas in the purging cavity is blown toward the observation window through the purging gas slit. The air inlet end face of the outer cavity (10) has multiple circumferentially distributed internal threaded holes, and the exhaust end face of the outer cavity (10) is fixed with a rear pressure plate (8) by bolts. The end of the rear pressure plate (8) is fixed with an annular sealing pressure plate (7). The air inlet end of the inner cavity (5) has a mounting flange, which is fixed in the internal threaded hole of the outer cavity (10) by bolts. The exhaust end of the inner cavity (5) is fitted inside the sealing pressure plate (7), and there is an annular gap between the sealing pressure plate (7) and the inner cavity (5).

2. The optical test section of the double-layer observation window as described in claim 1, characterized in that, The purge air outlet has a purge air curtain (4), one side of which has a sawtooth structure. The sawtooth structure and the inner cavity (5) form an equally spaced airflow gap, so that the purge air flowing out of the purge air outlet is blown toward the observation window through the airflow gap.

3. The optical test section of the double-layer observation window as described in claim 1, characterized in that, The outer cavity (10) is equipped with a cooling flow inlet pipe (9) and a cooling flow return pipe (11). The cooling airflow enters the outer cavity from the cooling flow inlet pipe (9) and flows out from the cooling flow return pipe (11).

4. The optical test section of the double-layer observation window as described in claim 1, characterized in that, The inner cavity (5) has a gradually contracting section near the exhaust end. A guide slope (6) is installed on the outer cavity (10) to form an equally spaced channel with the contracting section. Multiple evenly distributed vertical holes are opened on the guide slope (6). The guide slope (6), the outer cavity (10), and the rear pressure plate (8) form an air intake chamber. The cooling flow air intake pipe (9) is connected to the air intake chamber.

5. The optical test section of the double-layer observation window as described in claim 1, characterized in that, The observation window includes large and small observation windows installed in different positions, with the large observation window having a larger transparent area than the small observation window.

6. The optical test section of the double-layer observation window as described in claim 5, characterized in that, The large observation window includes an outer large observation window (17) and an inner large observation window (19). The outer large observation window (17) is fixed to the outer large observation window mounting base (15) by a stop and an outer large observation window cover (16). The outer large observation window mounting base (15) is fixed to the outer cavity (10) by bolts. The inner large observation window (19) is fixed to the inner cavity (5) by a stop that matches the inner cavity (5) and an inner observation window cover (18).

7. The optical test section of the double-layer observation window as described in claim 5, characterized in that, The small observation window includes an outer small observation window (14) and an inner observation window cover (18); the outer small observation window (14) is fixed on the outer small observation window mounting base (12) by the outer small observation window cover (13), the outer small observation window mounting base (12) is fixed on the outer cavity (10) by bolts, the inner small observation window (21) is embedded in the inner small observation window clamp (20), and then fixed on the inner small observation window adapter plate (22) by the inner small observation window cover (18), the inner small observation window adapter plate (22) is fixed on the inner cavity (5) by the inner small observation window cover (18).

8. The optical test section of the double-layer observation window as described in claim 1, characterized in that, The cross-section of the optical test section is rectangular.

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