| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain trap for a bathtub pan and a bathroom unit in which the drainage of a bathtub does not flow backward to the side of a bathtub pan even without providing a float valve and the maintenance is easy, a washing space floor can be lowered even if lowering a height of striding over the bathtub, and the occurrence of seal breaking sound in the drainage of the bathtub is prevented.SOLUTION: A drain trap for a bathtub pan is characterized by: partitioning the inside of a trap body 1 into a first seal water storage part and a second seal water storage part through a partition wall; draining bathtub drainage flowing into the first seal water storage part, from a first overflow port 32a into a first water passing part 21 of a drainage pipe part 2 through a first seal water pipe 42; performing suction drainage of the seal water in the second seal water storage part from a second overflow port 33a to the side of the drainage pipe part 2 until reaching a seal breaking state, when a negative pressure state occurs at the downstream from a second water passage 22 due to bathtub drainage; and making a portion of the drainage flowing into the second water passing part 22 from the first water passage 21 flow in as the seal water of the second seal water storage part through the second overflow port 33a, when the bathtub drainage is reduced. |
