Compact high altitude environment simulation system based on closed air circulation and control method

Abstract

The invention discloses a compact high altitude environment simulation system based on closed air circulation and a control method. The system is mainly composed of a high and low temperature closed environment chamber, a compressor, an expansion machine, a heat exchanger, a compression-side four-way reversing valve and an expansion-side four-way reversing valve, wherein the high and low temperature closed environment chamber is provided with a compression-side air vent and an expansion-side air vent; and the compressor and the expansion machine are coaxially arranged, and a high speed motor for driving the compressor and the expansion machine is arranged between the compressor and the expansion machine. According to different demands, the system can work in a refrigerating mode or a heating mode; when the system works in the refrigerating mode, the compression-side air vent serves as an air inlet, the expansion-side air vent serves as an air outlet, and the air in the closed environment chamber sequentially passes through the compression-side four-way reversing valve, the compressor, the heat exchanger, the expansion-side four-way reversing valve and the expansion machine so as to complete a refrigerating cycle; and when the system works in the heating mode, the compression-side air vent serves as an air outlet, the expansion-side air vent serves as an air inlet, and the air in the closed environment chamber sequentially passes through the expansion-side four-way reversing valve, the expansion machine, the heat exchanger, the compression-side four-way reversing valve and the compressor so as to complete a heating cycle.

Description

[0001] Technical field: [0002] The invention relates to a compact high-altitude environment simulation system and a control method based on closed air circulation, which are especially suitable for the environment creation of a large airtight high-low temperature environment cabin (ie, an aircraft environment simulation cabin), and belong to the field of aircraft environmental control. [0003] Background technique: [0004] The large airtight high and low temperature environment cabin, that is, the aircraft environment simulation cabin, requires the temperature in the cabin to vary from about -70°C to 70°C, with fast and reliable cooling and heating, energy saving and environmental protection, and requires good sealing performance in the cabin to achieve the required vacuum state . The existing environmental construction technology features are as follows: [0005] (1) Vapor compression cycle refrigeration is widely used, mature technology and high refrigeration efficiency....

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Problems solved by technology

But there are the following problems: ①Two sets of equipment (electric compressor and compressor-expander) need to be installed, which makes the system complex and difficult to maintain; heat, which makes the heating energy consumption huge; ③ generally open air circulation system, it is difficult to ensure the sealing of the system, which increases the load of vacuum equipment

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