Aircraft air conditioning device comprising a large-capacity mixer, method for installing such a device and aircraft equipped with such an air conditioning device

An air conditioning device comprising:

• a withdrawing circuit configured to withdraw air present in a conditioned-air zone,
• a mixer configured to mix the air withdrawn from the conditioned-air zone with regulated air coming from a regulated-air source, and
• a distribution circuit configured to re-inject the air exiting the mixer into the conditioned-air zone,
• the mixer comprising a body extending between lower and upper ends having at least one air inlet connected to the withdrawing circuit and positioned closer to the lower end than the upper end, and at least one air outlet connected to the distribution circuit and positioned closer to the upper end than the lower end,
• wherein one of the lower and upper ends is closed off by a lower or upper transverse wall,
• wherein the body of the mixer comprises an upper part comprising the upper end of the body and having a first junction plane, a lower part comprising the lower end of the body and having a second junction plane, and a connection system connecting the upper and lower parts in a sealed manner, the connection system being configured to allow relative movements between the upper and lower parts, and
• wherein the connection system comprises:
• a first sleeve, surrounding the upper and lower parts, having a first zone of overlap overlapping the upper part, a second zone of overlap overlapping the lower part and an intermediate zone connecting the first and second zones of overlap, the first sleeve having a first rigidity,
• a second sleeve surrounding the first sleeve, having a second rigidity greater than the first rigidity of the first sleeve and an adjustable diameter, comprising a first end segment at least partially overlapping the first zone of overlap of the first sleeve and a second end segment at least partially overlapping the second zone of overlap of the first sleeve,
• a first ring positioned between the first zone of overlap of the first sleeve and the first end segment of the second sleeve,
• a second ring positioned between the second zone of overlap of the first sleeve and the second end segment of the second sleeve.