Anti-icing device of air circulation refrigerating system

Abstract

The invention belongs to the technical field of aviation environmental control air circulation refrigeration, and discloses an air circulation refrigeration system anti-icing device which comprises a turbine cooler, a condenser, a heat regenerator, a cold return connecting pipe, a vortex return connecting pipe, a vortex cold connecting pipe and a cold return connecting pipe. After entrained air of an engine enters the heat regenerator, the entrained air enters the condenser through the cold return connecting pipe and is mixed with cold air transmitted by the turbine cooler through the vortex cooling connecting pipe, one part of the entrained air enters a user area to be used, and the other part of the entrained air enters the turbine cooler through the vortex return connecting pipe after being subjected to heat exchange through the heat regenerator through the cold return connecting pipe. Then the air is converted into cold air by the turbine cooler; and a gas-liquid circulating system is arranged between the heat regenerator and the condenser, and engine bleed air heat in the heat regenerator is provided for the condenser for anti-icing. The hot air end of the heat regenerator absorbs heat, the capillary pump is driven by the heat to drive the phase change working medium to bring the heat to the inlet end of the condenser, the loop heat pipe pipelines are evenly arranged on sealing strips of each layer of an inlet of the condenser, the heat can evenly heat air of each layer, ice prevention / removal is carried out, and the structure can be used for preventing and removing ice under the condition that external energy is not used. And the heat of the system is used for preventing / removing ice, so that the compensation loss of the system and the whole machine is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation environmental control air circulation refrigeration, and relates to an anti-icing device for an air circulation refrigeration system, and specifically to an anti-icing device for a terminal condenser of an aviation air circulation refrigeration system based on a double liquid storage loop heat pipe. Background Art

[0002] Types of environmental control systems Early aircraft environmental control systems were mainly used for thermal regulation of the cockpit and electronic equipment. Taking a simple air circulation refrigeration system as an example, the high-temperature and high-pressure air from the main engine compressor is first cooled by the ram air heat exchanger, and then enters the turbine for cooling and pressure reduction, while working on the fan. The cooled air is then supplied to the cockpit and electronic equipment after the temperature is adjusted by the condenser, and finally discharged into the atmosphere. Since the air outlet temperature is lower than the freezing point after turbine cooling, the free water in the air will freeze, and the ice particles will adhere to the condenser at the back. When the degree of freezing is severe, it will cause increased system resistance or blockage, causing the refrigeration system to reduce power or fail.

[0003] In order to solve the problem of condenser icing, the traditional solution is to introduce a channel of hot air, mix and heat it up before de-icing. Re-introducing high-temperature air from the engine alone will affect the power of the engine and increase the compensation loss of the whole machine. In addition, due to the uneven flow field distribution of the introduced airflow, the de-icing effect in some areas is not ideal. At the same time, the introduction of hot air will reduce the power of the refrigeration system. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an anti-icing device for an air circulation refrigeration system, which can use the heat of the system itself to prevent / de-ice and reduce the compensation loss of the system and the whole machine.

[0005] The technical solution of the present invention is as follows:

[0006] An anti-icing device for an air circulation refrigeration system comprises a turbine cooler, a condenser, a regenerator, a cold return connecting pipe, a return vortex connecting pipe, a vortex cooling connecting pipe and a return cold connecting pipe; after the engine bleed air enters the regenerator, it enters the condenser through the return cold connecting pipe, and after mixing with the cold air transmitted from the turbine cooler through the vortex cooling connecting pipe, a part of it enters the user area for use, and the other part passes through the cold return connecting pipe, undergoes heat exchange in the regenerator, enters the turbine cooler through the return vortex connecting pipe, and is then converted into cold air by the turbine cooler; a gas-liquid circulation system is provided between the regenerator and the condenser, and the heat of the engine bleed air in the regenerator is provided to the condenser for anti-icing.

[0007] Furthermore, the gas-liquid circulation system includes: an evaporator assembly is provided in the regenerator, a heat pipe condensing coil is provided in the condenser, the evaporation end of the evaporator assembly is connected to the heat pipe condensing coil through a heat pipe steam pipeline, and the liquid supply end of the evaporator assembly is connected to the heat pipe condensing coil through a heat pipe liquid pipeline.

[0008] Furthermore, the evaporator assembly includes a main reservoir and an evaporator. The main reservoir is arranged at the engine air intake end of the regenerator. The evaporator is connected to the main reservoir, and the evaporator is connected to the heat pipe steam pipeline.

[0009] Furthermore, the evaporator assembly also includes a saddle and an auxiliary liquid reservoir, the other end of the evaporator is connected to the auxiliary liquid reservoir through the saddle, and the auxiliary liquid reservoir is connected to the heat pipe liquid pipeline.

[0010] Furthermore, the evaporator and the saddle are connected by brazing or assembly; when brazing is adopted, the assembly gap between the evaporator and the saddle is not greater than 0.5 mm; when assembly is adopted, thermal conductive silicone grease is applied to the gap between the evaporator and the saddle.

[0011] Furthermore, the main liquid reservoir and the auxiliary liquid reservoir store the phase change working medium in the gas-liquid circulation system, the evaporation phase change temperature of the phase change working medium is not greater than the maximum temperature of the evaporator wall, and the condensation phase change temperature of the phase change working medium is not lower than the minimum inlet air temperature of the condenser connecting vortex cooling connecting pipe.

[0012] Furthermore, a fixed bracket is provided at the inlet of the condenser-connecting vortex cooling connecting pipe, and the heat pipe condensing coil is reciprocatingly mounted on the fixed bracket.

[0013] Furthermore, a rectifier is provided on the fixed bracket.

[0014] Technical effects of the present invention:

[0015] A double-liquid reservoir loop heat pipe is proposed to absorb heat from the hot air end of the regenerator of the air circulation cooling system, and drive the phase change working fluid to bring the heat to the inlet of the condenser through the heat-driven capillary pump. The loop heat pipe pipelines are evenly arranged on each layer of the seal at the inlet of the condenser. The heat therein can evenly heat the air in each layer for anti-icing / de-icing. This structure can use the system's own heat for anti-icing / de-icing without using external energy, thereby reducing the compensation loss of the system and the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 The figure is a schematic diagram of an implementation of an anti-icing device for an air circulation refrigeration system according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 AA section view;

[0019] Figure 3 yes Figure 1 BB cross-sectional view;

[0020] Among them, 1 is a turbine cooler, 2 is a vortex connecting pipe, 3 is a heat regenerator, 4 is a main liquid reservoir, 5 is an evaporator, 6 is a saddle, 7 is an auxiliary liquid reservoir, 8 is a cold return connecting pipe, 9 is a heat pipe liquid pipeline, 10 is a return cold connecting pipe, 11 is a condenser, 12 is a heat pipe steam pipeline, 13 is a vortex cooling connecting pipe, 14 is a heat pipe condensing coil, and 15 is a fixed bracket. DETAILED DESCRIPTION

[0021] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0024] Embodiment 1:

[0025] An anti-icing device for an air circulation refrigeration system comprises a turbine cooler 1, a condenser 11, a regenerator 3, a cold return connecting pipe 8, a return vortex connecting pipe 2, a vortex cooling connecting pipe 13 and a return cold connecting pipe 10; after the engine bleed air enters the regenerator 3, it enters the condenser 11 through the return cold connecting pipe 10, and after mixing with the cold air transmitted from the turbine cooler 1 through the vortex cooling connecting pipe 13, a part of it enters the user area for use, and the other part passes through the cold return connecting pipe 8, undergoes heat exchange in the regenerator 3, enters the turbine cooler 1 through the return vortex connecting pipe 2, and is then converted into cold air by the turbine cooler 1; a gas-liquid circulation system is provided between the regenerator 3 and the condenser 11, and the heat of the engine bleed air in the regenerator 3 is provided to the condenser 11 for anti-icing.

[0026] The gas-liquid circulation system includes: an evaporator assembly is arranged in the regenerator 3, a heat pipe condensing coil 14 is arranged in the condenser 11, the evaporation end of the evaporator assembly is connected to the heat pipe condensing coil 14 through the heat pipe steam pipeline 12, and the liquid supply end of the evaporator assembly is connected to the heat pipe condensing coil 14 through the heat pipe liquid pipeline 9.

[0027] The evaporator assembly includes a main reservoir 4 and an evaporator 5 . The main reservoir 4 is arranged at the engine air bleed end of the regenerator 3 . The evaporator 5 is connected to the main reservoir 4 . The evaporator 5 is connected to the heat pipe steam pipeline 12 .

[0028] The evaporator assembly further includes a saddle 6 and an auxiliary liquid reservoir 7 . The other end of the evaporator 5 is connected to the auxiliary liquid reservoir 7 through the saddle 6 , and the auxiliary liquid reservoir 7 is connected to the heat pipe liquid pipeline 9 .

[0029] The evaporator 5 and the saddle 6 are connected by brazing or assembly. When brazing is adopted, the assembly gap between the evaporator 5 and the saddle 6 is not greater than 0.5 mm. When assembly is adopted, thermal conductive silicone grease is applied to the gap between the evaporator 5 and the saddle 6.

[0030] The main liquid reservoir 4 and the auxiliary liquid reservoir 7 store the phase change working medium in the gas-liquid circulation system. The evaporation phase change temperature of the phase change working medium is not greater than the maximum temperature of the wall of the evaporator 5, and the condensation phase change temperature of the phase change working medium is not lower than the minimum inlet air temperature of the condenser 11 connecting the vortex cooling connecting pipe 13.

[0031] A fixed bracket is provided at the inlet of the condenser 11 connected to the vortex cooling connecting pipe 13, and the heat pipe condensing coil 14 is reciprocated on the fixed bracket.

[0032] The fixing bracket is provided with a rectifier.

[0033] Embodiment 2:

[0034] Figure 1 It is a schematic diagram of an anti-icing device and a processing method for an air circulation refrigeration system according to an embodiment of the present invention.

[0035] refer to Figure 1 , an air cycle refrigeration system anti-icing device may include:

[0036] Turbine cooler 1, vortex connecting pipe 2, regenerator 3, main liquid reservoir 4, evaporator 5, saddle 6, auxiliary liquid reservoir 7, cold return connecting pipe 8, heat pipe liquid pipeline 9, return cold connecting pipe 10, condenser 11, heat pipe steam pipeline 12, vortex cooling connecting pipe 13, heat pipe condensing coil 14, fixing bracket 15.

[0037] The evaporator 5 and the saddle 6 can be connected by brazing or assembly. When brazing is adopted, the assembly gap between the evaporator 5 and the saddle 6 should be controlled to be no greater than 0.5 mm to ensure the quality of brazing. When assembling, thermal conductive silicone grease should be applied to the gap between the evaporator 5 and the saddle 6 to increase thermal conductivity.

[0038] A main liquid reservoir 4 and an auxiliary liquid reservoir 7 are respectively arranged at both ends of the evaporator to store the phase change working medium in the loop heat pipe, while reducing the impact on the heat transfer performance of the loop heat pipe when the posture changes or the overload direction changes; the evaporation phase change temperature of the working medium should not be greater than the maximum temperature of the wall of the evaporator 5, and the condensation phase change temperature should not be lower than the minimum air temperature at the inlet of the cooler 11.

[0039] In a possible embodiment, the material of the saddle 6 is the same as that of the wall of the evaporator 5 , so that the saddle 6 can be connected to the wall of the evaporator 5 by welding to increase the thermal conductivity.

[0040] In a possible embodiment, the material of the fixing bracket 15 is the same as the core material of the condenser 11 so as to be connected and fixed to the condenser 11 by welding.

[0041] In a possible embodiment, the spacing between the heat pipe condensing coils 14 should be the same as the spacing between the hot side sealing edges of the condenser 11 to avoid excessive increase in the flow resistance on the cold air side of the condenser 11 .

[0042] In a possible embodiment, the cold air intake air collecting cover of the condenser 11 should be provided with inlet and outlet holes matching the diameter of the loop heat pipe line to facilitate the entry and exit of the pipe.

[0043] In a possible embodiment, one end of the fixing bracket 15 is fixed on the windward surface of the condenser inlet, and the other end is constrained to fix the heat pipe condensing coil 14 .

[0044] In a possible embodiment, the fixed heat pipe condensing coil 14 should be fixed on the windward side of the cold air inlet of the condenser 11 .

[0045] Embodiment 3:

[0046] A loop heat pipe device is introduced into the existing air circulation refrigeration system. The evaporator of the loop heat pipe is installed at the hot air end of the regenerator in the system. The loop is filled with the corresponding working fluid. The working fluid in the tube is in a two-phase saturated state before startup. The capillary wick in the evaporator can be soaked by the liquid working fluid provided by the compensator. The liquid working fluid on the outer surface of the capillary wick absorbs the heat from the evaporator coupled with the heat source and then evaporates to form a gaseous working fluid. The gaseous working fluid flows through the gas pipeline into the condensation pipeline. The condensation pipeline is arranged at the inlet end of the condenser in the air circulation refrigeration system after repeated folding. The high-temperature gaseous working fluid releases heat to the cold air at the inlet of the condenser through the condensation pipeline. After the working fluid is condensed into liquid, it continues to be cooled to a supercooled state, and the cold air is heated to prevent / de-ice. The gaseous working medium formed by continuous evaporation gradually pushes the liquid working medium in the condensation pipeline back to the evaporator end through the liquid pipeline, and is sucked to the outer surface of the capillary core under the action of the capillary force generated by the microporous structure in the capillary core to participate in heat absorption evaporation again. At this point, the working medium forms a cycle of evaporation, condensation and flow inside the loop, thereby completing the transfer of heat from the heat source to the cold source, thereby realizing the use of the heat of the hot air in the system to self-drive heat transfer for the condenser in the system to prevent / ice.

[0047] A mounting base is provided on the heat path on the side of the heat regenerator to fix the loop heat pipe and fit it tightly to the side of the heat regenerator to reduce the contact thermal resistance and obtain the best heat extraction effect.

[0048] The loop heat pipe structure should have dual liquid reservoirs to cope with the impact of attitude changes on heat transfer effects during flight.

[0049] The loop heat pipe condensing line should be bent and coiled according to the spacing of the hot edge seals of the condenser.

[0050] A fixing ring should be added on the windward side of the condenser to constrain the condensation pipeline.

[0051] The air inlet cover of the condenser should be equipped with inlets and outlets that match the pipelines and should be sealed or welded to facilitate the entry and exit of the loop pipelines.

[0052] The outermost channel of the reheated air should be filled with hot air.

[0053] The diameter of the loop heat pipe condensation pipeline should be smaller than the height of the seal on the hot air side of the condenser.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. An anti-icing device for an air circulation refrigeration system, characterized in that: The invention comprises a turbine cooler (1), a condenser (11), a regenerator (3), a cold return connecting pipe (8), a vortex connecting pipe (2), a vortex cooling connecting pipe (13) and a cold return connecting pipe (10); after the engine bleed air enters the regenerator (3), it enters the condenser (11) through the cold return connecting pipe (10), and after mixing with the cold air transmitted from the turbine cooler (1) through the vortex cooling connecting pipe (13), a part of the engine bleed air enters the user area for use, and the other part passes through the cold return connecting pipe (8), undergoes heat exchange in the regenerator (3), enters the turbine cooler (1) through the vortex connecting pipe (2), and is then converted into cold air by the turbine cooler (1); a gas-liquid circulation system between the regenerator (3) and the condenser (11) provides the heat of the engine bleed air in the regenerator (3) to the condenser (11) for anti-icing.

2. The anti-icing device for an air circulation refrigeration system according to claim 1, characterized in that: The gas-liquid circulation system comprises: an evaporator assembly is arranged in a regenerator (3), a heat pipe condensing coil (14) is arranged in a condenser (11), the evaporation end of the evaporator assembly is connected to the heat pipe condensing coil (14) via a heat pipe steam pipeline (12), and the liquid supply end of the evaporator assembly is connected to the heat pipe condensing coil (14) via a heat pipe liquid pipeline (9).

3. The anti-icing device for an air circulation refrigeration system according to claim 2, characterized in that: The evaporator assembly comprises a main liquid reservoir (4) and an evaporator (5). The main liquid reservoir (4) is arranged at the engine air intake end of the regenerator (3). The evaporator (5) is connected to the main liquid reservoir (4). The evaporator (5) is connected to a heat pipe steam pipeline (12).

4. The anti-icing device for an air circulation refrigeration system according to claim 3, characterized in that: The evaporator assembly also includes a saddle (6) and an auxiliary liquid reservoir (7). The other end of the evaporator (5) is connected to the auxiliary liquid reservoir (7) via the saddle (6), and the auxiliary liquid reservoir (7) is connected to the heat pipe liquid pipeline (9).

5. The anti-icing device for an air circulation refrigeration system according to claim 4, characterized in that: The evaporator (5) and the saddle (6) are connected by brazing or assembly. When brazing is used, the assembly gap between the evaporator (5) and the saddle (6) is no greater than 0.5 mm. When assembly is used, thermal conductive silicone grease is applied to the gap between the evaporator (5) and the saddle (6).

6. The anti-icing device for an air circulation refrigeration system according to claim 4, characterized in that: The main liquid reservoir (4) and the auxiliary liquid reservoir (7) store the phase change working medium in the gas-liquid circulation system, the evaporation phase change temperature of the phase change working medium is not greater than the maximum temperature of the wall surface of the evaporator (5), and the condensation phase change temperature of the phase change working medium is not lower than the minimum inlet air temperature of the condenser (11) connected to the vortex cooling connecting pipe (13).

7. The anti-icing device for an air circulation refrigeration system according to claim 2, characterized in that: A fixed bracket is provided at the inlet of the condenser (11) connected to the vortex cooling connection pipe (13), and the heat pipe condensing coil (14) is reciprocatingly mounted on the fixed bracket.

8. The anti-icing device for an air circulation refrigeration system according to claim 7, characterized in that: The fixed bracket is provided with a rectifier.

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