Tube coupling

A tube coupling configured to connect and couple two tubes that are configured to cause a fluid to flow inside the two tubes, the tube coupling comprising:

• a male connector including a first pipe configured to cause the fluid to flow inside the first pipe, and an insertion part having a protruding shape, the insertion part protruding in an axial direction that is an insertion direction;
• and
• a female connector including a second pipe configured to cause the fluid to flow inside the second pipe, and an insertion receiving part having a recessed shape, the insertion receiving part being recessed in the axial direction, the insertion receiving part being coupled to the insertion part when the insertion part is inserted into the insertion receiving part, wherein
• the insertion part includes:
• a first spring,
• a first pressing member having a protruding shape, the first pressing member protruding in the axial direction, the first pressing member being biased in the axial direction by the first spring when the male connector is not inserted into the female connector,
• a first seal member having an annular shape, the first seal member being disposed around the first pressing member, and
• a first outer peripheral member supporting the first spring in the axial direction, the first outer peripheral member being spaced from the first pressing member and surrounding the first pressing member,
• when the first pressing member is biased by the first spring, the first outer peripheral member is caused to abut on the first seal member, and a flow path between the first pipe and the second pipe is closed, and
• when the first spring is compressed, the first outer peripheral member is separated from the first seal member, and the flow path is opened,
• the insertion receiving part includes:
• a second spring,
• a second pressing member having a protruding shape, the second pressing member protruding in the axial direction, the second pressing member being biased outward in the axial direction by the second spring when the male connector is not inserted into the female connector, the second pressing member being caused to abut on the first pressing member when the male connector is inserted into the female connector,
• a second seal member having an annular shape, the second seal member being disposed around the second pressing member, and
• a second outer peripheral member,
• when the second pressing member is biased by the second spring, the second outer peripheral member is caused to abut on the second seal member, and the flow path is closed,
• when the second pressing member is not biased by the second spring, the second outer peripheral member is separated from the second seal member, and the flow path is opened,
• when the first spring biases the first pressing member and the second spring biases the second pressing member, the first outer peripheral member is caused to abut on the first seal member and the second outer peripheral member is caused to abut on the second seal member, and the flow path is brought into a closed state,
• when the male connector is inserted into the female connector and the first spring and the second spring are compressed, the first outer peripheral member is separated from the first seal member and the second outer peripheral member is separated from the second seal member, and the flow path is brought into an open state, and
• the second seal member has an outer diameter smaller than an outer diameter of the first seal member.