A kind of anti-condensation air supply system for rocket engine cabin, inter-bay section instrument cabin

Abstract

The application discloses a kind of for rocket engine cabin, anti-condensation air supply system of inter-bay section instrument cabin, comprising: fresh air pipeline unit, all fresh air handling unit, pressurized fan unit, air supply pipeline unit and control unit;Wherein, all fresh air handling unit and pressurized fan unit are using N+1 redundancy backup mode, and quantity one-to-one correspondence, N is the number of required unit calculation;All fresh air handling unit and pressurized fan unit are installed in air-conditioning room, under the control of control unit, fresh air pipeline unit will outdoor fresh air be sent to all fresh air handling unit, and all fresh air handling unit will be handled to the set state point according to the temperature requirement proposed by rocket propellant filling system, then be pressurized by pressurized fan unit and be sent to docking interface by air supply pipeline unit, and be docked with the active end device of space department, finally be sent into engine cabin and inter-bay section instrument cabin.

Description

Technical Field

[0001] This invention relates to the field of rocket launch technology, specifically to an anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section. Background Technology

[0002] During rocket cryogenic propellant loading, the temperature is extremely low, and the large temperature difference between the fuel tank and the adjacent instrument or engine compartments makes condensation and even icing highly likely. This poses a significant threat to the safe and stable operation of equipment and cables within the instrument and engine compartments. Based on domestic and international research, compressed air and nitrogen purging systems are generally used to maintain the temperature and humidity within the instrument and engine compartments, ensuring they meet operational requirements.

[0003] During summer refueling of conventional rocket propellants, the temperature is only a few degrees Celsius. The low temperature of the fuel tank after refueling makes it prone to condensation, affecting the safe operation of equipment and cables in the instrument and engine compartments. While the aforementioned compressed air and nitrogen purging system can maintain the thermal environment in the instrument and engine compartments, it increases the system load and reduces system reliability. Furthermore, setting up a separate compressed air and nitrogen purging system for conventional propellant refueling increases the complexity and investment in ground facilities and equipment, resulting in poor economic efficiency.

[0004] Therefore, it is of great significance to develop a stable, safe, reliable, easy-to-maintain, economical and energy-saving anti-condensation ventilation system to maintain the thermal environment of the instrument compartment and engine compartment in the rocket launch section to meet the usage requirements before launch. Summary of the Invention

[0005] In view of this, based on the technical conditions of the launch site and in response to the thermal environment requirements of the engine compartment and instrument compartment of the inter-compartment section during conventional rocket propellant loading, this invention provides an anti-condensation ventilation system for the rocket engine compartment and instrument compartment of the inter-compartment section, which can effectively meet the requirements of stable operation, safety and reliability, convenient maintenance, and economic energy saving.

[0006] The technical solution of the present invention is: an anti-condensation air supply system for rocket engine compartment and instrument compartment of inter-compartment, comprising: a fresh air duct unit, a fresh air handling unit unit, a pressurized fan unit, an air supply duct unit and a control unit; wherein, the fresh air handling unit unit and the pressurized fan unit adopt an N+1 redundancy backup method, and the number corresponds one-to-one, where N is the number of units required for calculation.

[0007] Both the fresh air handling unit and the pressurized fan unit are installed in the air conditioning room. Under the control of the control unit, the fresh air duct unit delivers outdoor fresh air to the fresh air handling unit. The fresh air handling unit processes the outdoor fresh air to the set state point according to the temperature requirements proposed by the rocket propellant refueling system. Then, it is pressurized by the pressurized fan unit and delivered to the docking interface through the air supply duct unit. It then connects with the aerospace department's active end device and finally delivers it into the engine compartment and the instrument compartment of the inter-compartment section. The air supply duct unit is equipped with two or more docking interfaces according to the elevation of the rocket engine compartment, the instrument compartment of the inter-compartment section and the location of the air outlet. The set state point of the outdoor fresh air is a dry bulb temperature of 15-25°C and a dew point temperature lower than the outer surface temperature of the rocket body fuel tank after refueling.

[0008] Preferably, N is 1, the fresh air handling unit unit includes: fresh air handling unit I and fresh air handling unit II, and the pressurized fan unit includes: pressurized fan I and pressurized fan II;

[0009] The 100% fresh air handling unit I and 100% fresh air handling unit II have the same structure, consisting of a shell and nine functional sections housed within it. The nine functional sections are distributed along the airflow direction inside the shell as follows: inlet pre-filter section, intermediate section I, surface cooling section, fan section, heating section, intermediate section II, medium-efficiency filter section, and outlet section. The inlet pre-filter section contains a pre-filter with a filtration efficiency of G4, using either a plate filter or a bag filter. The surface cooling section contains a surface cooler, employing either a direct evaporative cooling coil or a water-cooled surface cooler. When a water-cooled surface cooler is used, a baffle plate is installed after it. The fan section is equipped with a supply fan, whose air pressure is equal to the sum of the resistance of the fresh air duct unit and the internal resistance of the corresponding unit, with a margin of 10% to 20%. The heating section is equipped with a heater, which can be an electric heater, a direct evaporation heating coil, or a surface heat exchanger. When a surface heat exchanger is used, a stainless steel baffle is installed after the surface heat exchanger if the heat medium is hot water, and a stainless steel condensate pan is installed at the bottom of the surface heat exchanger if the heat medium is high-temperature steam. The medium-efficiency filtration section is equipped with a medium-efficiency filter with a filtration efficiency of F7, which can be a plate filter or a bag filter. The intermediate section I, intermediate section II, and the air outlet section are all empty sections.

[0010] Preferably, differential pressure sensors I are installed before and after the primary filter, and an alarm is triggered when the measured differential pressure I is greater than a set value; differential pressure sensors II are installed before and after the medium-efficiency filter, and an alarm is triggered when the measured differential pressure II is greater than a set value; differential pressure sensors III are installed before and after the blower, and an alarm is triggered when the measured differential pressure III is equal to 0; differential pressure sensors IV are installed before and after the pressurizing blower I and the pressurizing blower II, and an alarm is triggered when the measured differential pressure IV is equal to 0.

[0011] Preferably, the direct evaporation cooling coil, water-cooled surface cooler, direct evaporation heating coil, and surface heat exchanger all adopt a copper tube with aluminum fin structure, and are guaranteed to be leak-free under a test pressure of 1.6 MPa.

[0012] Preferably, the electric heater is interlocked with the blower. If the blower is not turned on, the electric heater cannot start, the electric heater stops running, the blower stops after a delay, and the blower is equipped with an alarm and protection for the upper limit of the blower temperature. At the same time, the power of the electric heater is activated in stages, with the final stage being continuously adjustable, and the heating element is made of stainless steel.

[0013] Preferably, the shell consists of a frame, a box panel, an inner panel, an inner bottom plate, and an outer bottom plate. The frame is made of aluminum alloy profiles, with insulation material filling the middle. The box panel is made of 0.5mm thick color steel plate. The inner panel is made of 0.5mm thick galvanized steel plate, with polyurethane foam filling the middle, which is 50mm thick. The inner bottom plate of the non-pedestrian maintenance area is made of 1.5mm thick color steel plate, and the inner bottom plate of the pedestrian maintenance area is made of 2.0mm thick galvanized steel plate. The outer bottom plate is made of 1.5mm thick galvanized steel plate.

[0014] Preferably, the fresh air duct unit includes: a fresh air duct and electrically operated airtight valves III and I installed on the fresh air duct, and the outlet of the fresh air duct is connected to the air inlet of the fresh air handling unit I and the fresh air handling unit II. The inlet of the fresh air duct is a rainproof louvered air outlet, which is detachably connected to a primary filter. The electrically operated airtight valves III and I are respectively installed after the inlet and before the outlet of the fresh air duct.

[0015] Preferably, the air supply duct unit includes: an air supply duct and an electrically operated airtight valve II, an air volume sensor I, an air volume sensor II, an explosion-proof electrically operated airtight regulating valve, an air duct union and an airtight valve and a manual airtight valve installed on the air supply duct.

[0016] The air supply duct's inlet connects to the outlets of both the fresh air handling unit I and the fresh air handling unit II, and its outlet is a connecting port. The air supply duct includes: a connecting duct I between the fresh air handling unit I and the booster fan I; a connecting duct II between the fresh air handling unit II and the booster fan II; an air supply riser; a connecting duct III between the booster fan I and the air supply riser; a connecting duct IV between the booster fan II and the air supply riser; and several horizontal branch pipes. The number of horizontal branch pipes is the same as the number of connecting ports.

[0017] The air volume sensor I is installed on the air supply riser in the air conditioning room;

[0018] Each horizontal branch pipe is equipped with an air volume sensor II and an explosion-proof electric airtight regulating valve, which are used to control the opening and closing of the corresponding interface and adjust the air volume according to the rocket model; the opening degree of the explosion-proof electric airtight regulating valve is adjusted according to the air volume measured by the air volume sensor II.

[0019] The horizontal branch pipe is equipped with a duct joint and a sealing valve at the junction of the fixed platform and the rotating platform of the launch tower.

[0020] Each interface is equipped with a manual shut-off valve.

[0021] Preferably, the electrically operated airtight valves I and II on the branch where the fresh air handling unit I and the pressurized fan I are located are interlocked with the fresh air handling unit I and the pressurized fan I, and open and close simultaneously; the electrically operated airtight valves I and II on the branch where the fresh air handling unit II and the pressurized fan II are located are interlocked with the fresh air handling unit II and the pressurized fan II, and open and close simultaneously.

[0022] Preferably, the elevation of the horizontal branch pipe is consistent with the elevation of the rocket engine compartment and the instrument compartment of the inter-compartment section; the diameter of the horizontal branch pipe is determined according to the required air volume of the rocket engine compartment and the instrument compartment of the inter-compartment section, based on a wind speed of 4 to 6 m / s; the number of the horizontal branch pipes is equal to the number of air outlets in the rocket engine compartment and the instrument compartment of the inter-compartment section.

[0023] Beneficial effects:

[0024] 1. The anti-condensation air supply system provided by this invention, through the cooperation of the fresh air duct unit, the fresh air handling unit unit, the air supply duct unit and the control unit, can effectively maintain the thermal environment requirements of the instrument compartment and engine compartment in the inter-cabin section before rocket launch, and effectively meet the requirements of stable operation, safety and reliability, convenient maintenance and economic energy saving. At the same time, considering that the air supply duct unit has a long pipe length and high end resistance, but requires a small air volume, it is difficult for ordinary fans to match. Therefore, a pressurized fan unit is used to take over.

[0025] 2. In this invention, the units required for the calculation of the fresh air handling unit and the pressurized fan unit are all set up as one set, and a backup set is set up for each set to ensure system reliability. At the same time, the specific structural design of the fresh air handling unit I and the fresh air handling unit II can process the outdoor fresh air supplied to them to a suitable state point, so that after being supplied to the engine compartment and the instrument compartment of the inter-cabinet section, it can effectively meet the mission requirements of the thermal environment inside the compartment and effectively prevent condensation in the rocket engine compartment and the instrument compartment of the inter-cabinet section.

[0026] 3. The anti-condensation air supply system of the present invention is equipped with differential pressure sensors before and after the primary filter, medium-efficiency filter, air supply fan, pressurizing fan I and pressurizing fan II. This facilitates real-time monitoring of pressure changes throughout the system and enables timely alarms in case of abnormal pressure, thereby further ensuring stable, safe and reliable, convenient maintenance and energy-saving operation of the system.

[0027] 4. The specific design of the fresh air duct unit in this invention can not only control the delivery of outdoor fresh air to the fresh air handling unit I and the fresh air handling unit II in real time through the control unit, but also effectively ensure the cleanliness inside the fresh air duct unit.

[0028] 5. The specific design of the air supply duct unit in this invention comprehensively considers the coordinated operation of multiple functions, such as real-time control of the control unit, air volume monitoring, air volume adjustment, opening and closing control of the interface, and opening and closing control of the rotary platform. Attached Figure Description

[0029] Figure 1 This is a rendering of the anti-condensation air supply system of the present invention.

[0030] Figure 2 This is a front view of the all-fresh-air air handling unit I (or all-fresh-air air handling unit II) in this invention.

[0031] Figure 3 This is a top view of the all-fresh-air air handling unit I (or all-fresh-air air handling unit II) in this invention.

[0032] Figure 4 This is a schematic diagram of the duct joint and the shut-off valve when the rotary platform is closed.

[0033] Figure 5 This is a schematic diagram of the ductwork joint and the airtight valve when the rotating platform is open.

[0034] Among them, 1a, Fresh Air Handling Unit I; 1b, Fresh Air Handling Unit II; 2a, Booster Fan I; 2b, Booster Fan II; 3, Supply Air Riser; 4, Air Volume Sensor I; 5, Horizontal Branch Pipe; 6, Connecting Interface; 7, Duct Union and Sealing Valve; 8, Explosion-proof Electric Sealing Regulating Valve; 9, Electric Sealing Valve I; 10, Electric Sealing Valve II; 11, Electric Sealing Valve III; 12, Rainproof Louvered Air Outlet; 13, Air Volume Sensor II; 1 4. Air inlet; 15. Air outlet; 16. Inspection door; 17. Pre-filter; 18. Surface cooler; 19. Water baffle; 20. Blower; 21. Heater; 22. Medium-efficiency filter; 23. Manual shut-off valve; 24. Shut-off air valve; 25. Air valve connecting rod; 26. Mechanical push rod transmission mechanism; 27. Air valve switch push rod; 28. Union joint sealing gasket; 29. ​​Union joint sealing flange; 30. Rotating shaft; 31. Stainless steel wire mesh. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] This embodiment provides an anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section, which can effectively meet the requirements of stable operation, safety and reliability, convenient maintenance, and economic energy saving.

[0037] like Figure 1 As shown, the anti-condensation air supply system includes: a fresh air duct unit, a fresh air handling unit unit, a pressurized fan unit, an air supply duct unit, and a control unit; wherein, the fresh air handling unit unit and the pressurized fan unit both adopt an N+1 redundancy backup method, and the number corresponds one-to-one, where N is the number of units required for calculation, to ensure that the rocket can be provided with low dew point fresh air that meets the requirements during the mission. In this embodiment, N is 1. The fresh air handling unit unit includes: fresh air handling unit I1a and fresh air handling unit II1b, and the pressurized fan unit includes: pressurized fan I2a and pressurized fan II2b;

[0038] Both the fresh air handling unit and the pressurized fan unit are installed in the air conditioning room, which is built on the launch tower or an auxiliary building of the launch tower. At the same time, the specific location of the air conditioning room should be designed to minimize the pipe length of the air supply duct unit in order to reduce system resistance.

[0039] Under the control of the control unit, the fresh air duct unit delivers outdoor fresh air to the 100% fresh air handling unit I1a and 100% fresh air handling unit II1b respectively. According to the temperature requirements proposed by the rocket propellant loading system, the 100% fresh air handling unit I1a and 100% fresh air handling unit II1b process the outdoor fresh air to a suitable state point (dry bulb temperature 15-25℃, dew point temperature lower than the outer surface temperature of the rocket body fuel tank after loading, generally controlled below 8℃). After being pressurized by pressurizing fan I2a and pressurizing fan II2b respectively, it is delivered to the docking interface 6 through the air supply duct unit, docking with the aerospace department's active end device (external device), and finally delivered into the engine compartment and the instrument compartment of the inter-cabin section to ensure that the thermal environment inside the compartment meets the mission requirements. Among them, the air supply duct unit is equipped with multiple docking interfaces 6 according to the elevation of the rocket engine compartment, the instrument compartment of the inter-cabin section and the location of the air supply outlet.

[0040] In this embodiment, the fresh air handling unit I1a and the fresh air handling unit II1b have the same structure, such as Figure 2 and Figure 3As shown, it consists of a shell and nine functional sections set within the shell. The shell is composed of a frame, a box panel, an inner panel, an inner bottom plate, and an outer bottom plate. Inside the shell, along the airflow direction, are respectively arranged an inlet pre-filter section, intermediate section I, a surface cooling section, a fan section, a heating section, intermediate section II, a medium-efficiency filter section, and an outlet section. The inlet pre-filter section contains a pre-filter 17 with a filtration efficiency of G4 level, which can be a plate filter or a bag filter. Intermediate sections I and II are empty sections, mainly serving to even out airflow. The surface cooling section contains a surface cooler 18, which can be a direct evaporative cooling coil (with an outdoor unit) or a water-cooled surface cooler. When a water-cooled surface cooler is used, a baffle 19 is installed after it (to prevent water from entering the next functional section). The baffle 19 is made of stainless steel. The unit section is equipped with a blower 20, which is a high-efficiency, low-noise blower. The air pressure is equal to the sum of the resistance of the fresh air duct unit and the internal resistance of the corresponding unit, with a margin (or redundancy) of 10% to 20%. The heating section is equipped with a heater 21, which can be an electric heater, a direct evaporation heat pump, or a surface heat exchanger. When a surface heat exchanger is used, a stainless steel baffle is installed after the surface heat exchanger if the heat medium is hot water, and a stainless steel condensate pan is installed at the bottom of the surface heat exchanger if the heat medium is high-temperature steam. The medium-efficiency filtration section is equipped with a medium-efficiency filter 22, with a filtration efficiency of F7, which can be a plate filter or a bag filter. The air outlet section is also an empty section, which can both uniformly distribute airflow and connect to the booster fan I 2a or booster fan II 2b through the air duct, i.e., it serves as a connection.

[0041] In this embodiment, differential pressure sensors I are installed before and after the primary filter 17 of both fresh air handling units I1a and II1b. An alarm is triggered when the measured differential pressure I: ΔP1 ≥ the set value. Differential pressure sensors II are installed before and after the secondary filter 22 of both fresh air handling units I1a and II1b. An alarm is triggered when the measured differential pressure II: ΔP2 ≥ the set value. Differential pressure sensors III are installed before and after the supply fan 20 of both fresh air handling units I1a and II1b. An alarm is triggered when the measured differential pressure III: ΔP3 = 0. Differential pressure sensors IV are installed before and after the pressurization fan I2a and II2b. An alarm is triggered when the measured differential pressure IV: ΔP4 = 0.

[0042] In this embodiment, both the cooling section of the fresh air handling unit I1a and the fresh air handling unit II1b are equipped with regulating device I, which can automatically adjust the cooling capacity of the section according to the temperature after the cooling section; both the heating section of the fresh air handling unit I1a and the fresh air handling unit II1b are equipped with regulating device II, which can automatically adjust the heating capacity of the section according to the temperature after the heating section.

[0043] In this embodiment, the inlet primary filter section, medium-efficiency filter section, fan section and heating section of the fresh air handling unit I1a and the fresh air handling unit II1b are all equipped with inspection doors 16, and the door panels of the inspection doors 16 are all double-layered structures, and polyurethane foam is molded in one piece, which can effectively prevent cold bridges.

[0044] In this embodiment, when the surface cooler 18 of the fresh air handling unit I1a and / or the fresh air handling unit II1b adopts a direct evaporative cooling coil or a water-cooled surface cooler, and the heater 21 adopts a direct evaporative heating coil or a surface heat exchanger, the direct evaporative cooling coil, the water-cooled surface cooler, the direct evaporative heating coil, and the surface heat exchanger all adopt a copper tube with aluminum fin structure (to enhance corrosion resistance), and ensure that there is no leakage under a test pressure of 1.6 MPa (in order to improve the system's pressure resistance).

[0045] In this embodiment, when the heater 21 of the fresh air handling unit I1a and / or fresh air handling unit II1b is an electric heater, the electric heater is interlocked with the air supply fan 20. If the air supply fan 20 is not turned on, the electric heater cannot start and will stop running. The air supply fan 20 needs to be delayed before stopping. The air supply fan 20 is equipped with an upper limit alarm and protection for the air supply temperature, that is, when the upper limit temperature is reached, the electric heater stops working. At the same time, the power of the electric heater can be stepped up according to the air supply temperature requirements. The final stage uses a thyristor for continuous adjustment (to facilitate energy saving), and the heating element is made of stainless steel (to improve service life).

[0046] In this embodiment, the frames of both the fresh air handling unit I1a and the fresh air handling unit II1b are made of aluminum alloy profiles, with insulation material filling the middle to ensure that neither the fresh air handling unit I1a nor the fresh air handling unit II1b generates cold bridges.

[0047] In this embodiment, the cabinet panels of both the fresh air handling unit I1a and the fresh air handling unit II1b are made of 0.5mm thick color steel plate (which helps to enhance corrosion resistance); the inner panels are made of 0.5mm thick galvanized steel plate; the middle is filled with polyurethane foam with a thickness of 50mm; the inner bottom plate of the non-pedestrian maintenance area is made of 1.5mm thick color steel plate; the inner bottom plate of the pedestrian maintenance area is made of 2.0mm thick galvanized steel plate; the outer bottom plate is made of 1.5mm thick galvanized steel plate; the overall design of the fresh air handling unit I1a and the fresh air handling unit II1b fully considers the prevention of cold bridges.

[0048] In this embodiment, both the pressurizing fan I2a and the pressurizing fan II2b are low-noise, high-pressure fans.

[0049] In this embodiment, the air ducts of both the fresh air duct unit and the supply air duct unit are made of galvanized steel sheet with a thickness of 1.0 to 1.2 mm, so as to adapt to the high-pressure system after the pressurizing fan I2a and pressurizing fan II2b.

[0050] In this embodiment, the duct insulation layer of the air supply duct unit is made of flame-retardant or non-combustible insulation material, and the insulation layer is covered with a galvanized steel plate or aluminum plate protective layer with a thickness of not less than 0.5mm.

[0051] In this embodiment, the processing air volume of the all-fresh air handling unit I1a or the all-fresh air handling unit II1b is determined by calculating the anti-condensation air volume requirements of all types of rockets served by the launch tower and taking the maximum value.

[0052] In this embodiment, the processing air volume of the pressurizing fan I2a is adapted to the corresponding fresh air handling unit I1a (with comparable air volume), and the processing air volume of the pressurizing fan II2b is adapted to the corresponding fresh air handling unit II1b (with comparable air volume). The air pressure is equal to the sum of the pressure loss of the entire air supply duct unit and the external active terminal device, with a 10% to 20% redundancy.

[0053] In this embodiment, interface 6 is a circular interface, the diameter of which is determined according to the size of the opening in the engine compartment and instrument compartment of the rocket body, generally φ100~φ250.

[0054] In this embodiment, the fresh air duct unit includes: a fresh air duct and an electrically operated airtight valve III11 and an electrically operated airtight valve I9 ​​installed on the fresh air duct. The outlet of the fresh air duct is connected to the air inlet 14 of the fresh air handling unit I1a and the fresh air handling unit II1b. The inlet of the fresh air duct is a rainproof louvered air outlet 12 with a built-in primary filter that can be disassembled and cleaned. The electrically operated airtight valve III11 and the electrically operated airtight valve I9 ​​are respectively installed after the inlet and before the outlet of the fresh air duct.

[0055] In this embodiment, the air supply duct unit includes: an air supply duct and an electrically operated airtight valve II10, an air volume sensor I4, an air volume sensor II13, an explosion-proof electrically operated airtight regulating valve 8, a duct joint and an airtight valve 7, and a manually operated airtight valve 23 installed on the air supply duct; wherein, the inlet of the air supply duct is connected to the air outlet 15 of the fresh air handling unit I1a and the fresh air handling unit II1b, and the outlet is a connector 6; the air supply duct includes: a connecting pipe I between the fresh air handling unit I1a and the booster fan I2a, a connecting pipe II between the fresh air handling unit II1b and the booster fan II2b, an air supply riser 3, a connecting pipe III between the booster fan I2a and the air supply riser 3, a connecting pipe IV between the booster fan II2b and the air supply riser 3, and several horizontal branch pipes 5 (the same number as the connectors 6);

[0056] An air volume sensor I4 is installed on the air supply riser 3 in the air conditioning room;

[0057] Each horizontal branch pipe 5 is equipped with an air volume sensor II13 and an explosion-proof electric airtight regulating valve 8 to control the opening and closing of the corresponding interface 6 and adjust the air volume according to the rocket model. The opening degree of the explosion-proof electric airtight regulating valve 8 can be adjusted according to the air volume measured by the air volume sensor II13. That is, if the air volume measured by the air volume sensor II13 is less than the preset air volume, the opening degree is increased; if the air volume measured by the air volume sensor II13 is greater than the preset air volume, the opening degree is decreased.

[0058] At the junction of the fixed platform and the rotating platform of the launch tower, the horizontal branch pipe 5 is equipped with a duct joint and a shut-off valve 7. The duct joint ensures the smooth opening and closing of the rotating platform, and the shut-off valve ensures the cleanliness of the air supply pipeline unit.

[0059] Each interface 6 is equipped with a manual shut-off valve 23 to ensure the cleanliness of the horizontal branch pipe 5 corresponding to each interface 6 of the air supply pipeline unit. That is, during the interval between rocket launches, the manual shut-off valve 23 is closed to maintain the cleanliness of the horizontal branch pipe 5. When the air supply pipeline unit is working, the explosion-proof electric shut-off regulating valve 8 on the corresponding horizontal branch pipe 5 and the manual shut-off valve 23 at the interface 6 are opened according to the rocket model to supply air to the rocket engine compartment and the instrument compartment of the inter-compartment section. Among them, the manual shut-off valve 23 should be a valve with low resistance when fully open to reduce the resistance of the entire system and ultimately achieve the purpose of energy saving.

[0060] In this embodiment, the electrically operated airtight valves I9 and II10 on the branch where the fresh air handling unit I1a and the pressurized fan I2a are located are interlocked with the fresh air handling unit I1a and the pressurized fan I2a, opening and closing simultaneously; the electrically operated airtight valves I9 and II10 on the branch where the fresh air handling unit II1b and the pressurized fan II2b are located are interlocked with the fresh air handling unit II1b and the pressurized fan II2b, opening and closing simultaneously.

[0061] In this embodiment, as Figure 4 As shown, when the tower is closed (the slewing platform rotates towards the fixed platform to facilitate holding the rocket), the slewing platform rotates inward along its rotation axis 30, pushing the air valve switch rod 27 to drive the air valve connecting rod 25 through the mechanical rod transmission mechanism 26 (with a return spring), thus opening the sealed air valve 24 to the fully open position; as Figure 5 As shown, when the tower is opened, the slewing platform rotates outward along its rotation axis 30, the pressure applied to the air valve switch rod 27 is released, the reset spring of the mechanical rod transmission mechanism 26 is restored, and the air valve connecting rod 25 is driven by the mechanical rod transmission mechanism 26 to naturally close the airtight air valve 24.

[0062] In this embodiment, the main body of the duct joint and the airtight valve 7 is made of stainless steel; stainless steel wire mesh 31 is welded to both sides of the duct joint close to the airtight flange 29 to prevent insects and birds from entering and staying during tower opening, thus affecting the cleanliness of the air supply duct unit; the stainless steel wire mesh 31 has a mesh count of 2, a wire diameter of 1.5mm, and an aperture of 12mm; the airtight flange 29 of the joint is made of a 10mm thick integral stainless steel plate to ensure its structural strength; the joint sealing gasket 28 set between the two airtight flanges 29 is made of 20mm thick closed-cell sponge, and the closed-cell sponge is connected by interlocking to ensure sealing performance.

[0063] In this embodiment, the elevation, diameter, and number of horizontal branch pipes 5 in the air supply duct unit are determined as follows: the elevation of the horizontal branch pipes 5 is as consistent as possible with the elevation of the rocket engine compartment and the instrument compartment of the inter-compartment section; the diameter of the horizontal branch pipes 5 is determined according to the required air volume of the rocket engine compartment and the instrument compartment of the inter-compartment section, based on a wind speed of 4 to 6 m / s; the number of end interfaces 6 of the air supply duct unit is equal to the number of air outlets in the rocket engine compartment and the instrument compartment of the inter-compartment section.

[0064] In this embodiment, the control unit consists of a control cabinet located in the air conditioning room and a control console located in the air conditioning central control room, along with their industrial control network. The control unit adopts a distributed control approach, allowing for centralized management and hierarchical control from the control console in the central control room, as well as local control of the fresh air handling units I1a and II1b from the air conditioning room. It balances manual and automatic control, centralized and local control, and also enables remote control. Furthermore, the control unit automatically records the operating time of the fresh air handling units I1a and II1b, facilitating users to rationally select which unit to operate (prioritizing the unit with the shorter cumulative operating time).

[0065] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A condensation-prevention ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section, characterized in that, include: The system comprises a fresh air duct unit, a fresh air handling unit, a booster fan unit, a supply air duct unit, and a control unit; among which, the fresh air handling unit and the booster fan unit both adopt an N+1 redundancy backup method, and the number corresponds one-to-one, where N is the number of units required for calculation. The fresh air handling unit and the pressurized fan unit are both installed in the air conditioning room. Under the control of the control unit, the fresh air duct unit sends the outdoor fresh air to the fresh air handling unit. The fresh air handling unit processes the outdoor fresh air to the set state point according to the temperature requirements proposed by the rocket propellant refueling system. Then, it is pressurized by the pressurized fan unit and sent to the docking interface (6) through the air supply duct unit. It is connected to the active end device of the aerospace department and finally sent into the engine compartment and the instrument compartment of the inter-box section. The air supply duct unit is equipped with two or more docking interfaces (6) according to the elevation of the rocket engine compartment, the instrument compartment of the inter-box section and the position of the air outlet. The set state point of the outdoor fresh air is that the dry bulb temperature is set at 15~25℃ and the dew point temperature is lower than the outer surface temperature of the rocket body fuel tank after refueling. The fresh air handling unit includes: fresh air handling unit I (1a) and fresh air handling unit II (1b), and the pressurized fan unit includes: pressurized fan I (2a) and pressurized fan II (2b); The fresh air handling unit I (1a) and fresh air handling unit II (1b) have the same structure, consisting of a shell and nine functional sections installed in the shell. The nine functional sections are distributed in the shell along the airflow direction as follows: inlet primary filter section, intermediate section I, surface cooling section, fan section, heating section, intermediate section II, medium-efficiency filter section and outlet section. Among them, the inlet primary filter section is equipped with a primary filter (17) with a filtration efficiency level of G4, which adopts a plate filter or a bag filter. The surface cooling section is equipped with a surface cooler (18), which adopts a direct evaporative cooling coil or a water-cooled surface cooler. When a water-cooled surface cooler is used, a baffle plate is installed behind it. (19); The fan section is equipped with a blower (20), whose air pressure is equal to the sum of the resistance of the fresh air duct unit and the internal resistance of the corresponding unit, with a margin of 10%~20%; The heating section is equipped with a heater (21), which adopts an electric heater, a direct evaporation heating coil, or a surface heat exchanger. When a surface heat exchanger is used, a stainless steel baffle is installed after the surface heat exchanger when the heat medium is hot water, and a stainless steel condensate pan is installed at the bottom of the surface heat exchanger when the heat medium is high-temperature steam; The medium-efficiency filter section is equipped with a medium-efficiency filter (22), with a filtration efficiency level of F7, which adopts a plate filter or a bag filter; The intermediate section I, intermediate section II, and the air outlet section are all empty sections; The fresh air duct unit includes: a fresh air duct and an electrically operated airtight valve III (11) and an electrically operated airtight valve I (9) installed on the fresh air duct. The outlet of the fresh air duct is connected to the air inlet (14) of the fresh air handling unit I (1a) and the fresh air handling unit II (1b). The inlet of the fresh air duct is a rainproof louvered air outlet (12) with a detachable primary filter screen. The electrically operated airtight valve III (11) and the electrically operated airtight valve I (9) are respectively installed after the inlet and before the outlet of the fresh air duct. The air supply pipeline unit includes: an air supply pipeline and an electric airtight valve II (10), an air volume sensor I (4), an air volume sensor II (13), an explosion-proof electric airtight regulating valve (8), an air duct union and an airtight valve (7), and a manual airtight valve (23) installed on the air supply pipeline. The inlet of the air supply duct is connected to the outlet (15) of the fresh air handling unit I (1a) and the fresh air handling unit II (1b), and the outlet is the interface (6); the air supply duct includes: the connecting duct I between the fresh air handling unit I (1a) and the booster fan I (2a), the connecting duct II between the fresh air handling unit II (1b) and the booster fan II (2b), the air supply riser (3), the connecting duct III between the booster fan I (2a) and the air supply riser (3), the connecting duct IV between the booster fan II (2b) and the air supply riser (3), and several horizontal branch pipes (5); wherein the number of horizontal branch pipes (5) is the same as the number of interfaces (6); The air volume sensor I (4) is installed on the air supply riser (3) in the air conditioning room; Each horizontal branch pipe (5) is equipped with an air volume sensor II (13) and an explosion-proof electric airtight regulating valve (8) to control the opening and closing of the corresponding interface (6) and regulate the air volume according to the rocket model; wherein, the opening degree of the explosion-proof electric airtight regulating valve (8) is adjusted according to the air volume measured by the air volume sensor II (13). The horizontal branch pipe (5) is equipped with a duct joint and a shut-off valve (7) at the junction of the fixed platform and the rotating platform of the launch tower. Each interface (6) is equipped with a manual shut-off valve (23).

2. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1, characterized in that, The primary filter (17) is equipped with differential pressure sensor I before and after it. When the measured differential pressure I is greater than the set value, an alarm is triggered. The secondary filter (22) is equipped with differential pressure sensor II before and after it. When the measured differential pressure II is greater than the set value, an alarm is triggered. The blower (20) is equipped with differential pressure sensor III before and after it. When the measured differential pressure III is equal to 0, an alarm is triggered. The pressurizing blower I (2a) and pressurizing blower II (2b) are equipped with differential pressure sensor IV before and after it. When the measured differential pressure IV is equal to 0, an alarm is triggered.

3. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1 or 2, characterized in that, The direct evaporation cooling coil, water-cooled surface cooler, direct evaporation heating coil, and surface heat exchanger all adopt a copper tube with aluminum fin structure and are guaranteed to be leak-free under a test pressure of 1.6 MPa.

4. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1 or 2, characterized in that, The electric heater is interlocked with the blower (20). If the blower (20) is not turned on, the electric heater cannot be started. The electric heater stops running, and the blower (20) stops after a delay. The blower (20) is set with an alarm and protection for the upper limit of the blower temperature. At the same time, the power of the electric heater is put into operation in stages, and the final stage is continuously adjustable. The heating element is made of stainless steel.

5. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1 or 2, characterized in that, The shell consists of a frame, a box panel, an inner panel, an inner bottom plate, and an outer bottom plate. The frame is made of aluminum alloy profiles with insulation material filling the middle. The box panel is made of 0.5mm thick color steel plate. The inner panel is made of 0.5mm thick galvanized steel plate with 50mm thick polyurethane foam filling the middle. The inner bottom plate of the non-pedestrian maintenance area is made of 1.5mm thick color steel plate, and the inner bottom plate of the pedestrian maintenance area is made of 2.0mm thick galvanized steel plate. The outer bottom plate is made of 1.5mm thick galvanized steel plate.

6. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1, characterized in that, The electrically operated airtight valves I (9) and II (10) on the branch where the fresh air handling unit I (1a) and the pressurized fan I (2a) are located are interlocked with the fresh air handling unit I (1a) and the pressurized fan I (2a) and open and close together. The electrically operated airtight valves I (9) and II (10) on the branch where the fresh air handling unit II (1b) and the pressurized fan II (2b) are located are interlocked with the fresh air handling unit II (1b) and the pressurized fan II (2b) and open and close together.

7. The anti-condensation ventilation system for rocket engine compartments and instrument compartments in the inter-compartment section as described in claim 1, characterized in that, The elevation of the horizontal branch pipe (5) is consistent with the elevation of the rocket engine compartment and the instrument compartment of the inter-compartment section; the pipe diameter of the horizontal branch pipe (5) is determined according to the required air volume of the rocket engine compartment and the instrument compartment of the inter-compartment section, based on a wind speed of 4~6m / s; the number of the horizontal branch pipes (5) is equal to the number of air outlets of the rocket engine compartment and the instrument compartment of the inter-compartment section.

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