Greenhouse

A greenhouse comprising:

• a support frame;
• and
• a spray pipe fixed on the support frame, the spray pipe comprising a plurality of pipes and a pipe joint disposed between ends of two adjacent pipes, and the pipe joint comprising a connecting pipe and two rotary sleeves respectively screwed to and sleeved on two ends of the connecting pipe;
• wherein the two adjacent pipes are respectively inserted into the two ends of the connecting pipe, each of the ends of the two adjacent pipes is sleeved with a sealing sleeve and a locking sleeve, and the sealing sleeve and the locking sleeve are located in a corresponding rotary sleeve of the two rotary sleeves;
• wherein each of the ends of the two adjacent pipes is further sleeved with a washer made of rigid material, each of the washers is located between the connecting pipe and the locking sleeve correspondingly, an inner edge of each of end surfaces of the connecting pipe has a sealing tapered surface, each of the sealing sleeves is located between the connecting pipe and the washer correspondingly;
• wherein when the two rotary sleeves are thread-tightened, the connecting pipe and each of the locking sleeves are capable of respectively abutting and pressing against two sides of each of the washers correspondingly;
• wherein when the connecting pipe is abutted and pressed against each of the washers, each of the sealing tapered surfaces is capable of acting on the sealing sleeve correspondingly, so that each of the sealing sleeves is compression-tightened between the connecting pipe, the washer, and the first adjacent pipe correspondingly;
• wherein under the abutting and pushing of the corresponding rotary sleeve of the two rotary sleeves and under the limiting of the washer, each of the locking sleeves is capable of grasping the adjacent pipe tightly and forming an axial positioning with the corresponding rotary sleeve of the two rotary sleeves;
• wherein a first end of each of the two rotary sleeves is sleeved on the connecting pipe, and an inner peripheral surface of a second end of each of the two rotary sleeves has an inward protruding locking portion, each of the locking sleeves is located between the inward protruding locking portion and the adjacent pipe correspondingly, when each of the locking sleeves is pressed against the washer, each of the locking sleeves is capable of contracting in a radial direction and grasping the adjacent pipe tightly under an action of the inward protruding locking portion correspondingly;
• wherein an inner peripheral surface of each of the inward protruding locking portions and an outer peripheral surface of each of the locking sleeves are both tapered surfaces, an end of the inner peripheral surface of each of the inward protruding locking portions with a larger diameter and an end of the outer peripheral surface of each of the locking sleeves with a larger diameter both face toward the connecting pipe, and a taper of the inner peripheral surface of each of the inward protruding locking portions is greater than a taper of the outer peripheral surface of each of the locking sleeves correspondingly;
• and
• wherein an end of each of the locking sleeves facing the washer has an outward protruding abutting rim circumferentially, and the inner peripheral surface of each of the inward protruding locking portions has abutted with the outward protruding abutting rim correspondingly.