Gas supply device, device for controlling inside air, and refrigeration device for container
In a gas supply device that supplies gas to a target space through a filter unit, the filter unit is composed of a filter box and an air filter housed in the filter box, and the air filter is a filter having a filter substrate made of a membrane filter and a fibrous coating layer covering a surface of the filter substrate through which air is sucked.
1. A container refrigeration apparatus, comprising:
a casing mounted on a container for use in marine transportation;
components of a refrigerant circuit attached to the casing; and
an inside air control system attached to the casing, wherein
the container refrigeration apparatus is configured to cool an internal space of the container, and supply a gas mixture to the internal space of the container using the inside air control system, and
the inside air control system includes:
a gas supply device; and
a gas mixture generator that generates a gas mixture having a higher nitrogen concentration and a lower oxygen concentration than air sucked through a filter unit of the gas supply device,
the gas supply device includes:
a gas passage that supplies gas to an indoor space;
a filter unit provided at an inlet of the gas passage; and
an air pump provided in the middle of the gas passage and configured to supply gas generated by the gas mixture generator to the indoor space,
the filter unit includes a filter box having an air intake surface and a plurality of wall surfaces and an air filter housed in the filter box such that a space between the air filter and the filter box includes a primary space which is present between the air intake surface of filter box and an air flow surface of the air filter and a plurality of secondary spaces, each of the plurality of secondary spaces being present between another surface of the air filter and an associated one of the wall surfaces of the filter box,
the air filter includes a filter substrate made of a membrane filter having waterproofness and air permeability, and a fibrous coating layer covering a surface of the filter substrate through which air is sucked, the fibrous coating layer being water absorbent,
the filter box further includes an integral seal packing which adheres to the air filter and the filter box, the integral seal packing adhering to the air filter around a peripheral edge of the air filter and adhering to the filter box around a peripheral edge of the air intake surface of the filter box to separate the primary space from the secondary spaces.
2. The container refrigeration apparatus of claim 1 , wherein the air filter includes a stack of a plurality of filter substrates.