A cryogenic nozzle

Abstract

The utility model discloses a low temperature nozzle belongs to turbojet engine technical field, including the outside shield of fixed connection in the engine tail nozzle, the side of outside shield near engine body is equipped with a plurality of air inlet at interval, and the one end of outside shield near engine tail nozzle spout is equipped with the air outlet. When engine body runs, the spout of engine tail nozzle sprays high temperature high -speed gas, at this moment, utilize siphon principle, will bring out the airflow in outside shield, and cold air keeps on continuously acting between engine tail nozzle and outside shield, and the cooling of engine tail nozzle is given, and outside shield also will break off the heat radiation that inside tail nozzle emits, reaches the effect that reduces engine tail nozzle temperature.

Description

Technical Field

[0001] This utility model belongs to the field of turbojet engine technology, and in particular relates to a cryogenic nozzle. Background Technology

[0002] Turbojet engines, as core components of aero-engine systems, are widely used in both military and civil aviation. In existing technologies, to optimize aircraft aerodynamics and reduce drag, turbojet engines are typically installed within the aircraft's main body using an embedded structure. However, this installation method introduces significant thermal management problems during engine operation: the exhaust nozzle, as a high-temperature exhaust channel, has an external casing surface temperature that can reach 600-1000℃ (the specific temperature depends on engine operating conditions). Due to unavoidable distance limitations (usually less than 300mm) between aircraft structural components and the exhaust nozzle's outer wall, the continuous accumulation of heat radiation and convective heat conduction creates abnormally high-temperature zones on the fuselage skin, frame, and adjacent equipment surfaces. Utility Model Content

[0003] The purpose of this invention is to provide a cryogenic nozzle to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a cryogenic nozzle, including an external cover fixed to the outside of the engine tail nozzle, wherein the external cover is provided with a plurality of air inlets at equal intervals on the side near the engine body, and an air outlet is provided at the end of the external cover near the outlet of the engine tail nozzle.

[0005] Preferably, the outer shield and the engine exhaust nozzle are fixedly connected by a plurality of first support plates and a plurality of second support plates, wherein the first support plates are located on the side of the engine exhaust nozzle closer to the engine body, and the second support plates are located on the side of the engine exhaust nozzle away from the engine body.

[0006] Preferably, a plurality of the first support plates are fixed at equal intervals to the outer wall of the engine exhaust nozzle.

[0007] Preferably, a plurality of the second support plates are fixed at equal intervals to the outer wall of the engine exhaust nozzle.

[0008] Preferably, the outer protective cover is made of a high-temperature alloy material.

[0009] The present invention discloses the following technical effects: When the engine body is running, high-temperature and high-speed gas is ejected from the nozzle of the engine tail nozzle. At this time, by using the siphon principle, the airflow inside the outer shield will be carried out. The cold air continuously acts between the engine tail nozzle and the outer shield, cooling the engine tail nozzle. At the same time, the outer shield will also block the heat radiation emitted by the internal tail nozzle, thereby achieving the effect of reducing the temperature of the engine tail nozzle. Attached Figure Description

[0010] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0011] Figure 1 This is a schematic diagram of the structure of the cryogenic nozzle of this utility model;

[0012] Figure 2 This is a structural schematic diagram of the cryogenic nozzle of this utility model from another angle;

[0013] Figure 3 This is a schematic diagram showing the distribution of the first and second support plates of this utility model.

[0014] In the diagram: 1. Engine tail nozzle; 2. External protective cover; 3. Engine body; 4. Air inlet; 5. Air outlet; 6. First support plate; 7. Second support plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] Reference Figures 1-3 As shown, this embodiment provides a cryogenic nozzle, including an outer cover 2 fixed to the outside of the engine tail nozzle 1. The outer cover 2 has a plurality of air inlets 4 at equal intervals on the side near the engine body 3, and an air outlet 5 is provided at the end of the outer cover 2 near the nozzle opening of the engine tail nozzle 1.

[0019] When the engine body 3 is running, high-temperature and high-speed gas is ejected from the nozzle of the engine tail nozzle 1. At this time, the airflow inside the outer shield 2 is carried out by the siphon principle. The cold air continuously acts between the engine tail nozzle 1 and the outer shield 2 to cool down the engine tail nozzle 1. At the same time, the outer shield 2 also blocks the heat radiation emitted by the internal tail nozzle, thus achieving the effect of reducing the temperature of the engine tail nozzle 1.

[0020] In a further optimized design, the outer shield 2 and the engine exhaust nozzle 1 are fixedly connected by multiple first support plates 6 and multiple second support plates 7. The first support plates 6 are located on the side of the engine exhaust nozzle 1 closer to the engine body 3, and the second support plates 7 are located on the side of the engine exhaust nozzle 1 away from the engine body 3.

[0021] The design was further optimized by fixing multiple first support plates 6 at equal intervals to the outer wall of the engine tail nozzle 1.

[0022] The design was further optimized by fixing multiple second support plates 7 at equal intervals to the outer wall of the engine exhaust nozzle 1.

[0023] The outer cover 2 is fixed by multiple first support plates 6 and multiple second support plates 7.

[0024] The design was further optimized, and the outer protective cover 2 was made of high-temperature alloy material.

[0025] Example 2

[0026] The only difference between the cryogenic nozzle in this embodiment and that in embodiment 1 is that a stainless steel oil pipe is wound around the outside of the engine tail nozzle 1. Before the engine oil enters the engine, it first passes through the oil passage of the stainless steel oil pipe to cool the engine tail nozzle 1 before entering the engine.

[0027] Example 3

[0028] The only difference between the cryogenic nozzle in this embodiment and that in embodiment 1 is that a liquid nitrogen cylinder and a pump are installed on the engine body, and a spray needle is installed outside the engine tail nozzle 1. The liquid nitrogen cylinder and the spray needle are connected by the pump, and the liquid nitrogen is continuously sprayed onto the engine tail nozzle 1 during the operation of the engine body 3 to achieve a cooling effect.

[0029] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A cryogenic nozzle characterized by: It includes an external shield (2) fixed to the outside of the engine tail nozzle (1), the external shield (2) having multiple air inlets (4) at equal intervals on the side near the engine body (3), and an air outlet (5) at the end of the external shield (2) near the opening of the engine tail nozzle (1).

2. The cryogenic nozzle of claim 1, wherein: The outer shield (2) is fixed to the engine tail nozzle (1) by a plurality of first support plates (6) and a plurality of second support plates (7), respectively. The first support plates (6) are located on the side of the engine tail nozzle (1) closer to the engine body (3), and the second support plates (7) are located on the side of the engine tail nozzle (1) away from the engine body (3).

3. The cryogenic nozzle of claim 2, wherein: Multiple first support plates (6) are fixed at equal intervals to the outer wall of the engine tail nozzle (1).

4. The cryogenic nozzle of claim 1, wherein: Multiple second support plates (7) are fixed at equal intervals to the outer wall of the engine tail nozzle (1).

5. The cryogenic nozzle of claim 1, wherein: The outer protective cover (2) is made of high-temperature alloy material.

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