A kind of air pressure balance device

Abstract

The invention discloses an air pressure balancing device, which comprises two wind screen caps, a shell with two open ends, two pressure pieces, a fixation frame and a spring. The wind screen caps respectively cover the two open ends of the shell, the wind screen caps are provided with a plurality of air inlet grids, and the inner surfaces of the wind screen caps are provided with a first guide rail rod. The fixation frame is located in the shell, the edge of the fixation frame clings to the inner wall of the shell, the fixation frame is provided with air holes, both sides of the fixation frame are respectively provided with a second guide rail rod, and the second guide rail rods and the first guide rail rods are in mutual butt joint. The air pressure balancing device can meet the air pressure balance requirement of the device, also can effectively eliminate the influence of circulating air flow on air pressure balance control, and has the characteristics of good airtightness under no pressure difference, accurate compensation of air pressure, and convenient installation, etc.

Description

technical field [0001] The invention relates to the technical field of environment simulation, in particular to an air pressure balance device. Background technique [0002] As a device for simulating ambient temperature, the high and low temperature test chamber can range from -70°C to 100°C. When carrying out high and low temperature tests, according to the principle of thermal expansion and cold contraction, the air pressure in the box is higher than the external air pressure at high temperature; the air pressure in the box is lower than the external air pressure at low temperature. If there is no air pressure balance device to ensure that the air pressure inside the box is balanced with the outside air pressure, it will cause the deformation of the test box body. However, if the air pressure balance device is poorly sealed, or is easily affected by the circulating wind in the chamber, resulting in excessive air exchange, it will affect the thermal insulation performance...

AI Technical Summary

Problems solved by technology

If there is no air pressure balance device to ensure the balance between the air pressure inside the box and the outside air pressure, it will cause the deformation of the test box

However, if the air pressure balance device is poorly sealed, or is easily affected by the circulating wind in the chamber, resulting in excessive air exchange, it will affect the thermal insulation performance of the test chamber

And when conducting low-temperature tests, due to excessive internal and external air exchange, a large amount of water vapor will condense around the condenser to form an ice layer, which will cause the test box to fail to cool down, and the low-temperature performance of the test box cannot meet the requirements.

[0003] The existing air pressure balance window adopts the pendulum type baffle design, the gap around the baffle is large, and the sealing performance is poor

It is easily affected by the wind force of the circulating fan in the box and frequently swings, resulting in a large amount of air exchange

At high temperature, heat is easily lost to the external environment, and the thermal insulation is poor; while in the low temperature test process, due to a large amount of air exchange, water vapor enters the test chamber and freezes on the condenser, making the test chamber unable to cool down

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