Online cryogenic heat exchange device for pressurized gas of liquid rocket

Abstract

The utility model provides an on-line cryogenic heat exchange device for pressurized gas of a liquid rocket. The on-line cryogenic heat exchange device comprises an outer cylinder, an inner cylinder and a heat exchange tube structure, the inner cylinder is a hollow sealed cylinder body, and a top through hole is formed in the middle of the top surface of the sealed cylinder body; a liquid low-temperature evaporation heat exchange medium is stored in the inner cylinder; a heat preservation gap which uses evaporation heat of a heat exchange medium as a heat preservation interlayer and isolates the inner cylinder from external heat leakage is formed between the inner cylinder and the outer cylinder, and the liquid low-temperature evaporation heat exchange medium in the sealed cylinder is discharged from a top through hole after being evaporated and enters the heat preservation gap; and the heat exchange tube structure is arranged in the inner cylinder. According to the utility model, the structural arrangement is reasonable, the processing difficulty is favorably reduced, the external heat leakage of the inner cylinder is isolated, the heat exchange and heat preservation effects are favorably improved, the evaporation capacity of a low-temperature propellant is reduced, the charging time of pressurized gas is shortened, the charging efficiency is improved, and the technical defects of low heat exchange efficiency and influence on the charging efficiency in the prior art are overcome.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology for liquid rocket pressurizing gas, specifically to an online cryogenic heat exchange device for liquid rocket pressurizing gas. Background Technology

[0002] During the flight of a liquid rocket, as the propellant in the tanks is continuously consumed, it is necessary to continuously fill the tanks with a medium to ensure that the engine inlet pressure remains stable, thereby ensuring the safe operation of the engine and ensuring flight safety. In the pressurization system of a liquid rocket, the tanks are usually pressurized with helium or nitrogen. To reduce the storage space of pressurized helium or nitrogen, it is usually immersed in a cryogenic propellant tank under high pressure and low temperature. When the pressurized gas is stored on the rocket, in order to ensure the ability to cover the entire flight process, while also reducing the space occupied on the rocket and the load loss caused by the weight of the gas cylinders, the pressurized gas cylinders are usually immersed in cryogenic propellant, allowing the pressurized gas to be stored in a high-pressure, low-temperature form, which can greatly improve the storage quality of pressurized gas per unit volume.

[0003] The loading of pressurizing gas into a hydraulic rocket is completed on the ground. It is part of the pre-launch pressurization process before the launch of the hydraulic rocket. The loading rate and temperature of the pressurizing gas directly affect the mass of the pressurizing gas and the amount of propellant loaded into the cryogenic storage tank, which in turn determines the rocket launch time.

[0004] Chinese patent application No. 201020686012.1 discloses a spiral cryogenic gas heat exchanger for a liquid rocket propellant tank, in which heat exchange tubes are mounted on the bottom of a liquid oxygen tank via mounting brackets, and the heat exchange tube assembly is achieved by spirally rising heat exchange tubes.

[0005] In the process of developing this utility model, the inventors discovered at least the following problems in the prior art: the heat exchanger heats the liquid cryogenic evaporation heat exchange medium, while the ground-based refueling system needs to cool the added medium; the heat exchanger only has heat exchange coils and is installed inside the liquid oxygen tank, so there is no need to consider the heating and exhaust of liquid oxygen, while the ground-based refueling system uses cryogenic medium to cool the pressurized gas online, and the exhaust effect of the heated gas on the cryogenic medium needs to be considered. The existing technology cannot meet the needs of high-flow-rate pressurization and heat exchange refueling on the ground, thus limiting its applicability and practicality. Utility Model Content

[0006] In view of this, the purpose of this utility model embodiment is to provide an online cryogenic heat exchange device for liquid rocket pressurization gas, which aims to solve the technical shortcomings of the prior art that are not suitable for the large-flow online cryogenic heat exchange refueling of onboard liquid cryogenic evaporation heat exchange medium on the ground, while achieving the purpose of shortening the pressurization gas refueling time, improving refueling efficiency, and ensuring rocket launch nodes.

[0007] This utility model provides an online cryogenic heat exchange device for liquid rocket pressurization gas, including an outer cylinder, an inner cylinder, and a heat exchange tube structure;

[0008] The inner cylinder is a hollow sealed cylinder, and a top through hole is provided in the middle of the top surface of the sealed cylinder;

[0009] The inner cylinder contains a liquid low-temperature evaporative heat exchange medium.

[0010] A heat-insulating gap is provided between the inner cylinder and the outer cylinder, which uses the heat evaporation heat of the heat exchange medium as a heat-insulating layer and isolates the inner cylinder from external heat leakage.

[0011] After the liquid low-temperature evaporating heat exchange medium in the sealed cylinder evaporates, it is discharged from the top through hole and enters the heat preservation gap.

[0012] The heat exchange tube structure is disposed in the inner cylinder.

[0013] A further preferred embodiment is that the outer cylinder is provided with a liquid low-temperature evaporation heat exchange medium discharge port, which is used to discharge the liquid low-temperature evaporation heat exchange medium in the insulation gap from the outer cylinder.

[0014] A further preferred embodiment is that a connecting flange cover is fixedly connected to the top end of the outer cylinder;

[0015] The heat exchanger tube structure includes multiple heat exchanger tube bodies of different diameters, a pressurizing medium exhaust gas collection pipe, and a pressurizing medium inlet gas collection pipe.

[0016] The top ends of the booster medium exhaust manifold and the booster medium inlet manifold pass through the connecting flange cover.

[0017] A further preferred embodiment is that the plurality of heat exchange tube bodies are concentrically arranged, the pressurizing medium exhaust gas collecting pipe is welded and fixed to the top end of the heat exchange tube body, and the pressurizing medium inlet gas collecting pipe is welded and fixed to the bottom end of the heat exchange tube body.

[0018] A further preferred embodiment is that the middle part of the connecting flange cover is provided with a serpentine exhaust gas collection pipe interface and a serpentine inlet gas collection pipe interface, and the middle part of the connecting flange cover is also fixed with a liquid low-temperature evaporation heat exchange medium injection pipe and a liquid circuit pressure tapping pipe.

[0019] The lower parts of the liquid low-temperature evaporation heat exchange medium filling pipe and the liquid circuit pressure tapping pipe extend to the bottom of the inner cylinder, and the outer end of the liquid circuit pressure tapping pipe is directly connected to the atmosphere. The liquid low-temperature evaporation heat exchange medium filling pipe is used to fill the inner cylinder with liquid low-temperature evaporation heat exchange medium.

[0020] A further preferred embodiment is that a heat insulation pad is provided at the bottom of the inner cylinder;

[0021] The inner cylinder and the heat insulation pad are integrally disposed inside the outer cylinder.

[0022] A further preferred embodiment is that a level gauge is provided at the top of the outer cylinder;

[0023] The level gauge passes through the outer cylinder and extends into the inner cylinder to detect the liquid level of the low-temperature evaporative heat exchange medium in the inner cylinder.

[0024] The level gauge includes a pressure tapping tube for liquid low-temperature evaporative heat exchange medium, an atmospheric environment communication interface, a digital display screen, and a mounting plate.

[0025] The liquid low-temperature evaporation heat exchange medium pressure tapping pipe and the top of the atmospheric environment conduction interface are connected to the bottom interface of the digital display screen, and the digital display screen is fixed on the mounting plate;

[0026] The mounting plate is fixed to the top of the outer cylinder, the bottom end of the liquid low-temperature evaporation heat exchange medium pressure tapping pipe extends into the inner cylinder, and the atmospheric environment conduction interface is connected to the external atmospheric environment.

[0027] The digital display screen is used to show that the equivalent flow area of ​​the inner cylinder and the pressurized medium inlet gas collecting pipe is the same as the sum of the flow areas of the multiple heat exchange tube bodies.

[0028] A further preferred embodiment is that a plurality of serpentine tube fixing clamps are welded and fixed inside the inner cylinder;

[0029] Multiple heat exchange tube bodies are threaded onto the serpentine tube fixing clamps and spot-welded in place.

[0030] A further preferred embodiment is that the liquid cryogenic evaporation heat exchange medium is liquid nitrogen, liquid oxygen, or liquid helium, and the liquid level of the liquid cryogenic evaporation heat exchange medium is 50%-70% of the depth of the inner cylinder.

[0031] The above technical solution has the following beneficial effects:

[0032] 1. The present invention has a reasonable structure, including an outer cylinder and an inner cylinder, with an insulation gap between the inner cylinder and the outer cylinder. The overall structure is simple, which helps to reduce the processing difficulty and processing cost. It can isolate the inner cylinder from external heat leakage, which helps to improve the heat exchange and insulation effect, reduce the evaporation of cryogenic propellant, thereby shortening the pressurization gas filling time and improving the filling efficiency. It solves the technical shortcomings of the prior art, such as low heat exchange efficiency that affects the filling efficiency.

[0033] 2. Furthermore, it is equipped with a heat exchange tube structure, heat insulation pad, connecting flange cover and liquid level gauge, which can deeply cool the high-flow-rate, high-pressure ambient temperature liquid cryogenic evaporative heat exchange medium to near the temperature of cryogenic propellant online. This can reduce the heat generation during gas pressurization, ensure that the pressurized gas temperature reaches the ambient temperature quickly, reduce the waiting time for the gas temperature to drop during the pressurization process, reduce the amount of cryogenic propellant evaporation, thereby shortening the pressurized gas refueling time, improving refueling efficiency, and ensuring rocket launch nodes are met.

[0034] 3. The heat exchanger tube structure includes four heat exchanger tube bodies of different diameters, a pressurized medium exhaust gas collection pipe and a pressurized medium inlet gas collection pipe. The above structure helps to increase the heat exchange area, improve the heat exchange efficiency, and reduce the evaporation of cryogenic propellant, thereby shortening the pressurized gas filling time and improving the filling efficiency.

[0035] 4. Several coil fixing clamps are welded and fixed in the inner cylinder, which can effectively ensure the installation stability of the heat exchange tube structure, ensure the effectiveness of heat exchange, and also increase the reinforcement of the heat exchange tube structure, ensuring that the coil does not move or shift when the material shrinks and deforms at low temperature, thus improving the reliability of use.

[0036] 5. Several mounting bolt holes are evenly spaced along the edge of the connecting flange cover. A serpentine exhaust gas collection pipe interface and a serpentine inlet gas collection pipe interface are provided in the middle. A liquid low-temperature evaporative heat exchange medium filling pipe and a liquid circuit pressure tapping pipe are also fixed in the middle. The overall structure is simple, which facilitates the filling of liquid low-temperature evaporative heat exchange medium and the operation of liquid circuit pressure tapping. It also facilitates the connection and positioning of the heat exchange tube structure, and improves the stability and reliability of the assembly.

[0037] 6. The level gauge includes a pressure tapping tube for the liquid cryogenic evaporation heat exchange medium, an atmospheric environment connection interface, a digital display screen, and a mounting plate. It facilitates pressure tapping and monitoring display, allows for real-time viewing, helps ensure the liquid level of the liquid cryogenic evaporation heat exchange medium, and improves the stability and effectiveness of its use.

[0038] 7. The equivalent flow area of ​​both the pressurized medium exhaust gas collection pipe and the pressurized medium inlet gas collection pipe is the same as the sum of the flow areas of the four heat exchange tube bodies. Through the above structure, the flow path is guaranteed to be unthrottled, which is conducive to improving the effectiveness and smoothness of heat exchange. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0041] Figure 2 This is a schematic diagram of the outer cylinder in an embodiment of this utility model;

[0042] Figure 3 This is a cross-sectional structural diagram of the outer cylinder in an embodiment of this utility model;

[0043] Figure 4 This is a schematic diagram of the inner cylinder structure in an embodiment of this utility model;

[0044] Figure 5 This is a schematic diagram of the heat exchange tube structure in an embodiment of this utility model;

[0045] Figure 6 This is a schematic diagram of the structure of the heat insulation pad in an embodiment of this utility model;

[0046] Figure 7 This is a schematic diagram of the structure of the snake tube fixing clamp in an embodiment of this utility model;

[0047] Figure 8 This is a schematic diagram of the liquid level gauge in an embodiment of this utility model;

[0048] Figure 9 This is a schematic diagram of the connecting flange cover in an embodiment of this utility model.

[0049] Figure label:

[0050] 1. Outer cylinder; 11. Cylinder body; 12. Outer cylinder cover; 13. Bottom guide section inside the cylinder; 14. Discharge port for liquid low-temperature evaporative heat exchange medium; 15. Flange interface; 16. Mounting lugs; 17. Cylinder body lifting points; 18. Bottom support legs of the cylinder;

[0051] 2. Inner cylinder; 21. Sealed cylinder; 22. Top through hole;

[0052] 3. Heat exchanger tube structure; 31. Heat exchanger tube body; 32. Pressurized medium exhaust and collection pipe; 33. Pressurized medium inlet and collection pipe;

[0053] 4. Heat insulation pad;

[0054] 5. Connecting flange cover; 51. Mounting bolt holes; 52. Coiled tube exhaust manifold interface; 53. Coiled tube inlet manifold interface; 54. Liquid cryogenic evaporative heat exchange medium filling pipe; 55. Liquid circuit pressure tapping pipe;

[0055] 6. Level gauge; 61. Pressure tapping pipe for low-temperature liquid evaporation heat exchange medium; 62. Atmospheric environment communication interface; 63. Digital display screen; 64. Mounting support plate;

[0056] 7. Snake tube fixing clamp. Detailed Implementation

[0057] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. In the accompanying drawings and the following description, at least some well-known structures and techniques have not been shown to avoid unnecessarily obscuring the utility model; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0058] like Figures 1 to 9 As shown, an online cryogenic heat exchange device for liquid rocket pressurization gas includes an outer cylinder 1, an inner cylinder 2, a heat exchange tube structure 3, a heat insulation pad 4, a connecting flange cover 5, and a liquid level gauge 6. Its working principle is to use the high enthalpy of evaporation generated by the evaporation of the liquid low-temperature evaporation heat exchange medium in the inner cylinder 2 to cool the high-pressure, high-flow-rate pressurization gas flowing in the heat exchange tube structure 3, thereby realizing cryogenic heat exchange operation.

[0059] like Figure 6 As shown, in practical applications, during assembly, the heat insulation pad 4 is fitted onto the bottom of the inner cylinder 2, and the inner cylinder 2 and the heat insulation pad 4 are integrally arranged inside the outer cylinder 1, with an insulation gap between the inner cylinder 2 and the outer cylinder 1. In this embodiment, the outer surface of the heat insulation pad 4 is in close contact with the bottom guide section 13 of the outer cylinder 1, and the inner surface of the heat insulation pad 4 is in close contact with the sealing cylinder 21 of the inner cylinder 2. Its main function is to reduce heat conduction through contact between the inner cylinder 2 and the outer cylinder 1. Furthermore, the heat exchange tube structure 3 is arranged in the inner cylinder 2, and the inner cylinder 2 stores a liquid low-temperature evaporative heat exchange medium; in this embodiment, the liquid low-temperature evaporative heat exchange medium is nitrogen, oxygen, or helium. The liquid level of the liquid low-temperature evaporative heat exchange medium is 50%-70% of the depth of the inner cylinder 2. When the liquid level is below 50%, it needs to be replenished to approximately 70%. Simultaneously, the connecting flange cover 5 is pressed onto the top of the outer cylinder 1 and fixedly connected, with the end of the heat exchange tube structure 3 passing through the connecting flange cover 5. The level gauge 6 is fixed to the top of the outer cylinder 1, passing through the outer cylinder 1 and extending into the inner cylinder 2, used to detect the liquid level of the cryogenic evaporative heat exchange medium in the inner cylinder 2. The cryogenic evaporative heat exchange medium can be liquid nitrogen. Under conditions requiring higher heat exchange loads and even lower temperatures after cryogenic heat exchange using pressurized gas, liquid helium can also be used as the cryogenic evaporative heat exchange medium.

[0060] like Figure 5As shown, in this embodiment, the heat exchanger tube structure 3 includes four heat exchanger tube bodies 31 with different diameters, a pressurized medium exhaust and collection pipe 32, and a pressurized medium inlet and collection pipe 33. During assembly, the four heat exchanger tube bodies 31 are concentrically arranged. The pressurized medium exhaust and collection pipe 32 is welded and fixed to the top of the four heat exchanger tube bodies 31, and the pressurized medium inlet and collection pipe 33 is welded and fixed to the bottom of the four heat exchanger tube bodies 31. The top ends of the pressurized medium exhaust and collection pipe 32 and the pressurized medium inlet and collection pipe 33 pass through the connecting flange cover 5. Furthermore, the equivalent flow area of ​​the pressurized medium exhaust and collection pipe 32 and the pressurized medium inlet and collection pipe 33 is the same as the sum of the flow areas of the four heat exchanger tube bodies 31. This structure ensures that the flow path is unobstructed, guaranteeing the effectiveness and uniformity of heat exchange. The length, spacing, diameter, and pipe diameter of the heat exchanger tube bodies 31 can be obtained through thermal calculations based on the input parameters of the liquid low-temperature evaporation heat exchange medium and the required temperature, ensuring the effectiveness and reliability of heat exchange. During operation, high-pressure, high-flow-rate pressurized gas is continuously introduced into the heat exchange tube body 31, resulting in cryogenic pressurized gas with a temperature below -192℃ at the outlet of the heat exchange tube body 31. This ensures the effectiveness and stability of heat exchange, effectively addresses the need for online cryogenic pressurization of the pressurized gas, shortens the pressurized gas refueling time, and improves the cryogenic quality of the pressurized gas. Regarding the pressurizing medium, during liquid rocket flight, as the propellant in the storage tank is continuously consumed, a medium needs to be continuously added to the tank to maintain a stable engine inlet pressure, thereby ensuring safe engine operation and flight safety. In the pressurization system of a liquid rocket, the storage tank is pressurized by helium or nitrogen. To reduce the storage space required for pressurized helium or nitrogen, it is immersed in a cryogenic propellant tank under high pressure and low temperature. When the pressurized gas is stored on the rocket, in order to ensure the ability to cover the entire flight process, while also reducing the space occupied on the rocket and the load loss caused by the weight of the gas cylinder, the pressurized gas cylinder is immersed in cryogenic propellant. This allows the pressurized gas to be stored in a high-pressure and low-temperature form, which can greatly improve the mass of pressurized gas stored per unit volume.

[0061] like Figure 7 As shown, in this embodiment, several coil fixing clamps 7 are welded and fixed in the inner cylinder 2; four heat exchange tube bodies 31 are inserted through the coil fixing clamps 7 and spot-welded. The sides and bottom surfaces of the coil fixing clamps 7 are welded and fixed to the inner wall and bottom wall of the inner cylinder 2, which can ensure the stability and reliability of the installation. The heat exchange tube bodies 31 pass through the coil fixing clamps 7 and are spot-welded, which is mainly used to fix the heat exchange tube bodies 31 and increase the strength of the heat exchange tube bodies 31, ensuring that no abnormalities such as movement or displacement occur when the material shrinks and deforms at low temperatures, thus ensuring the stability and reliability of use.

[0062] Figure 9As shown, in this embodiment, a plurality of mounting bolt holes 51 are evenly spaced along the edge of the connecting flange cover 5. A serpentine exhaust gas collection pipe interface 52 and a serpentine inlet gas collection pipe interface 53 are provided in the middle of the connecting flange cover 5. A liquid low-temperature evaporative heat exchange medium filling pipe 54 and a liquid pressure tapping pipe 55 are also fixed in the middle of the connecting flange cover 5. During assembly, the lower parts of the liquid low-temperature evaporative heat exchange medium filling pipe 54 and the liquid pressure tapping pipe 55 extend to the bottom of the inner cylinder 2, and the outer end of the liquid pressure tapping pipe 55 is directly connected to the bottom of the level gauge 6. The liquid low-temperature evaporative heat exchange medium filling pipe 54 is used to fill the inner cylinder 2 with liquid low-temperature evaporative heat exchange medium. The pressurizing medium exhaust gas collection pipe 32 passes through the serpentine exhaust gas collection pipe interface 52 and is welded and fixed. The pressurizing medium inlet gas collection pipe 33 passes through the serpentine inlet gas collection pipe interface 53 and is welded and fixed. The connecting flange cover 5 is attached to the top of the outer cylinder 1 and fixed with bolts. Its overall structure helps to simplify the structure of the heat exchange device, and integrates the liquid low-temperature evaporation heat exchange medium filling, liquid level gauge pressure tapping, liquid low-temperature evaporation heat exchange medium venting into one place, making the overall structure simpler, reducing processing difficulty, processing cost and product processing cycle, and improving the stability and reliability of use.

[0063] like Figure 4 As shown, in this embodiment, the inner cylinder 2 is a hollow sealed cylinder 21, and a top through hole 22 is provided in the middle of the top surface of the sealed cylinder 21. The pressurized medium exhaust gas collection pipe 32 and the pressurized medium inlet gas collection pipe 33 are both inserted through the top through hole 22, and the liquid low-temperature evaporation heat exchange medium in the sealed cylinder 21 is discharged from the top through hole 22 and enters the insulation gap after evaporation. The main function of the top through hole 22 is to allow the assembly of the heat exchange tube structure 3 and the corresponding tube of the level gauge 6 to pass through, and to allow the liquid low-temperature evaporation heat exchange medium in the sealed cylinder 21 to be discharged from the top through hole 22 and enter the insulation gap after evaporation, so that nitrogen can flow to act as an insulation layer.

[0064] like Figure 2 and Figure 3As shown, in practical applications, the outer cylinder 1 includes a cylinder body 11, an outer cylinder cover 12, an inner bottom guide section 13, and a liquid low-temperature evaporation heat exchange medium discharge port 14. A flange interface 15 is provided in the center of the top surface of the outer cylinder cover 12, and mounting lugs 16 are fixed on both the outer cylinder cover 12 and the cylinder body 11. The outer cylinder cover 12 is connected to the connecting flange cover 5 via the flange interface 15 and fixed with bolts, and the two mounting lugs 16 are connected and fixed. The inner bottom guide section 13 is located at the bottom of the inner wall of the cylinder body 11, and the bottom of the inner cylinder 2 is restrained within the inner bottom guide section 13 by a heat insulation pad 4. The liquid low-temperature evaporation heat exchange medium discharge port 14 is located at the lower part of the side wall of the cylinder body 11, used to discharge the liquid low-temperature evaporation heat exchange medium in the insulation gap into the outer cylinder 1. Several cylinder body lifting points 17 are fixed on the upper part of the outer wall of the cylinder body 11, and cylinder bottom support legs 18 are fixed on the bottom of the cylinder body 11. Its liquid low-temperature evaporation heat exchange medium discharge port 14 is used to discharge nitrogen gas generated after the liquid low-temperature evaporation heat exchange medium in the inner cylinder 2 evaporates and flows through the insulation gap. The installation lugs 16 ensure the stability and sealing reliability of the connection between the cylinder body 11 and the outer cylinder cover 12, and also ensure the uniformity of the connection force. The cylinder body lifting point 17 facilitates the transportation and relocation of the entire device. The cylinder bottom support leg 18 can be connected and fixed to the ground through the expansion bolt holes to ensure the stability and reliability of the installation position. The bottom guide section 13 inside the cylinder is used to constrain the installation position of the inner cylinder 2 to be stable.

[0065] like Figure 8 As shown, in this embodiment, the level gauge 6 includes a liquid low-temperature evaporation heat exchange medium pressure tapping pipe 61, an atmospheric environment communication interface 62, a digital display screen 63, and a mounting plate 64. The tops of the liquid low-temperature evaporation heat exchange medium pressure tapping pipe 61 and the atmospheric environment communication interface 62 are connected to the bottom interface of the level display screen 63, which is fixed on the mounting plate 64. The mounting plate 64 is fixed to the top of the outer cylinder cover 12, and the bottom end of the liquid low-temperature evaporation heat exchange medium pressure tapping pipe 61 extends into the inner cylinder 2. The atmospheric environment communication interface 62 is connected to the external atmospheric environment. The digital display screen 63 is used to display the liquid level height of the liquid low-temperature evaporation heat exchange medium in the inner cylinder 2. It is fixed to the top of the outer cylinder cover 12 by welding to ensure the stability and reliability of the installation.

[0066] The method of use is as follows: liquid nitrogen is added to the inner cylinder 2 to pre-cool the overall structure and ensure that the liquid level reaches about 70% of the inner cylinder 2. The heat exchange tube structure 3 is connected and high-pressure, high-flow-rate pressurized gas is continuously introduced. This allows the outlet of the heat exchange tube structure 3 to obtain cryogenic pressurized gas with a temperature of less than -192℃. During the online cryogenic process of the liquid cryogenic evaporation heat exchange medium, the liquid level display of the liquid level gauge 6 needs to be monitored. When the liquid level is lower than 50%, the liquid level needs to be added to about 70% to ensure the effectiveness and stability of the online cryogenic process. After the liquid nitrogen is heated and evaporated into cold nitrogen gas, it will enter the insulation gap between the inner cylinder 2 and the outer cylinder 1 through the top through hole 22 of the inner cylinder 2. It will act as a flowing insulation layer to isolate the heat input to the inner cylinder 2 from the outside, and finally be discharged out through the liquid cryogenic evaporation heat exchange medium discharge port 14 in the outer cylinder 1.

[0067] The above technical solution has the following beneficial effects:

[0068] 1. The present invention has a reasonable structure, including an outer cylinder and an inner cylinder, with an insulation gap between the inner and outer cylinders. Its overall structure is simple, which helps to reduce processing difficulty and processing cost. It can isolate the inner cylinder from external heat leakage, which helps to improve the heat exchange and insulation effect, reduce the evaporation of cryogenic propellant, thereby shortening the pressurization gas filling time and improving the filling efficiency. It solves the technical shortcomings of the prior art that have low heat exchange efficiency and affect the filling efficiency.

[0069] 2. Furthermore, it is equipped with a heat exchange tube structure, heat insulation pad, connecting flange cover and liquid level gauge, which can deeply cool the high-flow-rate, high-pressure ambient temperature liquid cryogenic evaporative heat exchange medium to near the temperature of cryogenic propellant online. This can reduce the heat generation during gas pressurization, ensure that the pressurized gas temperature reaches the ambient temperature quickly, reduce the waiting time for the gas temperature to drop during the pressurization process, reduce the amount of cryogenic propellant evaporation, thereby shortening the pressurized gas refueling time, improving refueling efficiency, and ensuring rocket launch nodes are met.

[0070] 3. The heat exchanger tube structure includes four heat exchanger tube bodies of different diameters, a pressurized medium exhaust gas collection pipe and a pressurized medium inlet gas collection pipe. The above structure helps to increase the heat exchange area, improve the heat exchange efficiency, and reduce the evaporation of cryogenic propellant, thereby shortening the pressurized gas filling time and improving the filling efficiency.

[0071] 4. Several coil fixing clamps are welded and fixed in the inner cylinder, which can effectively ensure the installation stability of the heat exchange tube structure, ensure the effectiveness of heat exchange, and also increase the reinforcement of the heat exchange tube structure, ensuring that the coil does not move or shift when the material shrinks and deforms at low temperature, thus improving the reliability of use.

[0072] 5. Several mounting bolt holes are evenly spaced along the edge of the connecting flange cover. A serpentine exhaust gas collection pipe interface and a serpentine inlet gas collection pipe interface are provided in the middle. A liquid low-temperature evaporative heat exchange medium filling pipe and a liquid circuit pressure tapping pipe are also fixed in the middle. The overall structure is simple, which facilitates the filling of liquid low-temperature evaporative heat exchange medium and the operation of liquid circuit pressure tapping. It also facilitates the connection and positioning of the heat exchange tube structure, and improves the stability and reliability of the assembly.

[0073] 6. The level gauge includes a pressure tapping tube for the liquid cryogenic evaporation heat exchange medium, an atmospheric environment connection interface, a digital display screen, and a mounting plate. It facilitates pressure tapping and monitoring display, allows for real-time viewing, helps ensure the liquid level of the liquid cryogenic evaporation heat exchange medium, and improves the stability and effectiveness of its use.

[0074] 7. The equivalent flow area of ​​both the pressurized medium exhaust gas collection pipe and the pressurized medium inlet gas collection pipe is the same as the sum of the flow areas of the four heat exchange tube bodies. Through the above structure, the flow path is guaranteed to be unthrottled, which is conducive to improving the effectiveness and smoothness of heat exchange.

[0075] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the utility model and for simplifying the description, 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 the utility model. Furthermore, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this utility model should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0077] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An online cryogenic heat exchange device for liquid rocket pressurization gas, characterized in that: It includes an outer cylinder (1), an inner cylinder (2), and a heat exchange tube structure (3); The inner cylinder (2) is a hollow sealed cylinder (21), and a top through hole (22) is provided in the middle of the top surface of the sealed cylinder (21); The inner cylinder (2) contains a liquid low-temperature evaporative heat exchange medium; A heat-insulating gap is provided between the inner cylinder (2) and the outer cylinder (1) to use the heat of evaporation of the heat exchange medium as a heat-insulating layer and to prevent the inner cylinder (2) from being exposed to external heat leakage. After the liquid low-temperature evaporation heat exchange medium in the sealed cylinder (21) evaporates, it is discharged from the top through hole (22) and enters the heat preservation gap; The heat exchange tube structure (3) is disposed in the inner cylinder (2).

2. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 1, characterized in that: The outer cylinder (1) is provided with a liquid low-temperature evaporation heat exchange medium discharge port (14) for discharging the liquid low-temperature evaporation heat exchange medium in the insulation gap from the outer cylinder (1).

3. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 1, characterized in that: A connecting flange cover (5) is fixedly connected to the top of the outer cylinder (1); The heat exchange tube structure (3) includes multiple heat exchange tube bodies (31) with different diameters, a pressurized medium exhaust gas collection pipe (32) and a pressurized medium inlet gas collection pipe (33); The top ends of the booster medium exhaust manifold (32) and the booster medium inlet manifold (33) are inserted through the connecting flange cover (5).

4. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 3, characterized in that: Multiple heat exchange tube bodies (31) are arranged concentrically. The pressurized medium exhaust gas collection pipe (32) is welded and fixed to the top of the heat exchange tube body (31), and the pressurized medium inlet gas collection pipe (33) is welded and fixed to the bottom of the heat exchange tube body (31).

5. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 3, characterized in that: The connecting flange cover (5) is provided with a serpentine exhaust gas collection pipe interface (52) and a serpentine inlet gas collection pipe interface (53) in the middle part. The connecting flange cover (5) is also fixed with a liquid low temperature evaporation heat exchange medium injection pipe (54) and a liquid circuit pressure tapping pipe (55). The lower parts of the liquid low-temperature evaporation heat exchange medium filling pipe (54) and the liquid circuit pressure tapping pipe (55) extend to the bottom of the inner cylinder (2), and the outer end of the liquid circuit pressure tapping pipe (55) is directly connected to the atmosphere. The liquid low-temperature evaporation heat exchange medium filling pipe (54) is used to fill the inner cylinder (2) with liquid low-temperature evaporation heat exchange medium.

6. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 1, characterized in that: A heat insulation pad (4) is provided at the bottom of the inner cylinder (2); The inner cylinder (2) and the heat insulation pad (4) are integrally disposed inside the outer cylinder (1).

7. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 1, characterized in that: A level gauge (6) is provided on the top of the outer cylinder (1); The level gauge (6) passes through the outer cylinder (1) and extends into the inner cylinder (2) to detect the liquid level of the liquid low-temperature evaporative heat exchange medium in the inner cylinder (2); The level gauge (6) includes a liquid low-temperature evaporation heat exchange medium pressure tapping tube (61), an atmospheric environment communication interface (62), a digital display screen (63), and a mounting plate (64); The top of the liquid low-temperature evaporation heat exchange medium pressure tapping pipe (61) and the atmospheric environment conduction interface (62) are connected to the bottom interface of the digital display screen (63), and the digital display screen (63) is fixed on the mounting plate (64); The mounting plate (64) is fixed to the top of the outer cylinder (1), the bottom end of the liquid low temperature evaporation heat exchange medium pressure tapping pipe (61) extends into the inner cylinder (2), and the atmospheric environment conduction interface (62) is connected to the external atmospheric environment; The digital display screen (63) is used to display the liquid level of the liquid low-temperature evaporation heat exchange medium inside the inner cylinder (2).

8. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 3, characterized in that: The equivalent flow area of ​​the pressurized medium exhaust gas collection pipe (32) and the pressurized medium inlet gas collection pipe (33) is the same as the sum of the flow areas of the multiple heat exchange tube bodies (31).

9. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 3, characterized in that: Several serpentine tube fixing clamps (7) are welded and fixed in the inner cylinder (2); Multiple heat exchange tube bodies (31) are threaded through the serpentine tube fixing clamp (7) and spot welded to fix them.

10. The online cryogenic heat exchanger for liquid rocket pressurization gas according to claim 1, characterized in that: The liquid cryogenic evaporation heat exchange medium is liquid nitrogen, liquid oxygen or liquid helium, and the liquid level of the liquid cryogenic evaporation heat exchange medium is 50%-70% of the depth of the inner cylinder (2).

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