Multi-layer sleeping pad

A multi-layer sleeping pad, comprising:

• an outer air cushion;
• an inner air cushion;
• and
• a first cushion pad;
• wherein the outer air cushion is provided with a first cavity;
• the inner air cushion is arranged in the first cavity, such that the first cavity is divided into a first sub-cavity arranged between an inner top of the outer air cushion and an outer top of the inner cushion and a second sub-cavity arranged between an outer bottom of the inner air cushion and an inner bottom of the outer air cushion;
• the first cushion pad is arranged in the first sub-cavity;
• and the first cushion pad is configured to cushion a pressure applied by the inner top of the outer air cushion to the outer top of the inner air cushion;
• the multi-layer sleeping pad further comprises an inflation structure;
• the inflation structure is connected to the outer air cushion and the inner air cushion;
• the inner air cushion is provided with a second cavity;
• and the inflation structure is configured to inflate the first sub-cavity, the second sub-cavity and the second cavity;
• the inflation structure comprises a first inflation assembly and a second inflation assembly;
• the first inflation assembly is connected to the second inflation assembly and the outer air cushion;
• the second inflation assembly is connected to the inner air cushion;
• the first inflation assembly is configured to inflate the first sub-cavity and the second sub-cavity;
• and the second inflation assembly is configured to inflate the second cavity;
• the first inflation assembly comprises a first sealing assembly and a first air channel;
• the first sealing assembly is connected to the second inflation assembly and a first end of the first air channel;
• a second end of the first air channel is arranged in the first cavity;
• the first air channel is configured to communicate the first cavity with an external environment;
• and the first sealing assembly is configured to seal the first air channel;
• the first sealing assembly comprises a first sealing part and a first connecting part;
• one end of the first connecting part is connected to the second inflation assembly and the first end of the first air channel;
• and the other end of the first connecting part is connected to the first sealing part;
• and
• the first connecting part is provided with a first convex surface and a first concave surface;
• the first convex surface is configured to be connected to the first air channel in use, and the first concave surface is configured to be connected to the first sealing part in use;
• the first sealing assembly further comprises a first gasket;
• and the first gasket is arranged on the first convex surface, and is configured to enhance sealing between the first convex surface and the first air channel.