Drip emitter

Abstract

A drip emitter has a hollow body provided with first and second pools and with an inlet recess between the first and second pools. The inlet recess has inlet hole(s). The emitter is provided with an elastic band surrounding at least one of the inlet holes. The elastic band, in its closed position, is in a tight contact with the inlet hole(s). In its open position, it is expanded to open the inlet hole(s).

1 . An irrigation drip emitter ( 1 ) comprising:
 a hollow body having a first end ( 100 ), a second end ( 500 ), an outer surface ( 200 ), and an inner surface ( 300 );   a first end wall ( 11 ) formed on the outer surface ( 200 ) at or near the first end ( 100 );   a second end wall ( 51 ) formed on the outer surface ( 200 ) at or near the second end ( 500 );   a first inner wall ( 21 ) formed on the outer surface ( 200 ) and having a first end ( 211 ) and a second end ( 212 );   a second inner wall ( 41 ) formed on the outer surface ( 200 ) and having a first end ( 411 ) and a second end ( 412 );   an inlet recess ( 30 ) defined by the outer surface ( 200 ), the second end ( 212 ) of the first inner wall ( 21 ), and the second end ( 412 ) of the second inner wall ( 41 ) and provided with one or more inlet holes ( 35 ) through which a fluid flowing along the inner surface ( 300 ) is configured to be supplied to the inlet recess ( 30 );   a first pool ( 10 ) defined by the outer surface ( 200 ), the first end wall ( 11 ), and the first end ( 211 ) of the first inner wall ( 21 );   a second pool ( 50 ) defined by the outer surface ( 200 ), the second end wall ( 51 ), and the first end ( 411 ) of the second inner wall ( 41 ); and   an elastic band ( 60 ) surrounding at least one of the inlet holes ( 35 ) provided in the inlet recess ( 30 ),   wherein the first inner wall ( 21 ) includes at least one vertical wall, at least one horizontal wall, or a combination thereof to define a first labyrinth fluid flow path ( 20 ),   wherein the second inner wall ( 41 ) includes at least one vertical wall, at least one horizontal wall, or a combination thereof to define a second labyrinth fluid flow path ( 40 ), and   wherein the elastic band ( 60 ) is configured to move between a closed position where the elastic band ( 60 ) is in a tight contact with the inlet holes ( 35 ) to prevent a fluid from flowing out of the inlet holes ( 35 ) and an open position where the elastic band ( 60 ) is expanded by a fluid flowing out of the inlet holes ( 35 ) to thereby allow the fluid to flow to the inlet recess ( 30 ).   
     
     
         2 . The irrigation drip emitter of  claim 1 , wherein the first inner wall ( 21 ) includes at least one horizontal branch wall, at least one vertical branch wall, or a combination thereof. 
     
     
         3 . The irrigation drip emitter of  claim 1 , wherein the second inner wall ( 41 ) includes at least one horizontal branch wall, at least one vertical branch wall, or a combination thereof. 
     
     
         4 . The irrigation drip emitter of  claim 1 , wherein the width of horizontal and vertical fluid paths formed by the horizontal and vertical walls of the first inner wall ( 21 ) gradually increases or decrease as it goes from the second end ( 212 ) of the first inner wall ( 21 ) towards the first end ( 211 ) of the first inner wall ( 21 ). 
     
     
         5 . The irrigation drip emitter of  claim 1 , wherein the width of horizontal and vertical fluid paths formed by the horizontal and vertical walls and sub-walls of the second inner wall ( 41 ) gradually increases or decreases as it goes from the second end ( 412 ) of the second inner wall ( 41 ) towards the first end ( 411 ) of the second inner wall ( 41 ). 
     
     
         6 . The irrigation drip emitter of  claim 1 , wherein the first end ( 211 ) of the first inner wall ( 21 ) has one or more fluid passages ( 24 ), the second end ( 212 ) of the first inner wall ( 21 ) has one or more fluid passages ( 23 ), the second end ( 412 ) of the second inner wall ( 41 ) has one or more fluid passages ( 43 ), and the first end ( 411 ) of the second inner wall ( 41 ) has one or more fluid passages ( 44 ) such that the first and second pools ( 10 ,  50 ), the first and second labyrinth fluid flow paths ( 20 ,  40 ), and the inlet recess ( 30 ) are in fluid communication with each other directly or indirectly. 
     
     
         7 . The irrigation drip emitter of  claim 6 , wherein at least one of the fluid passages is formed in the midst of the first end ( 211 ) of the first inner wall ( 21 ), the second end ( 212 ) of the first inner wall ( 21 ), the first end ( 411 ) of the second inner wall ( 41 ), the second end ( 412 ) of the second inner wall ( 41 ), or a combination thereof. 
     
     
         8 . The irrigation drip emitter of  claim 1 , further comprising an additional first end wall ( 13 ) formed on the outer surface ( 200 ) at or near the first end ( 100 ), an additional second end wall ( 53 ) formed on the outer surface ( 200 ) at or near the second end ( 500 ), or both. 
     
     
         9 . The irrigation drip emitter of  claim 1 , wherein the inlet holes ( 35 ) are formed in a single or multiple rows ( 33 ). 
     
     
         10 . The irrigation drip emitter of  claim 1 , wherein the elastic band ( 60 ) surrounds some of the inlet holes ( 35 ). 
     
     
         11 . An irrigation line tube ( 5 ) formed in a hollow body having a first end, a second end, an outer surface, and an inner surface, the irrigation line tube comprising:
 dripping holes ( 15 ,  55 ) penetrating the outer surface and the inner surface of the irrigation line tube; and   a plurality of the irrigation drip emitters of  claim 1  provided in series inside the irrigation line tube,   wherein the dripping holes ( 55 ,  15 ) are positioned above all or some of the first pools ( 10 ) of the irrigation drip emitters ( 1 ), all or some of the second pools ( 50 ) of the irrigation drip emitters, or a combination thereof.   
     
     
         12 . The irrigation line tube of  claim 11 , wherein the area of cross-sections of the inner surfaces ( 300 ) of the irrigation drip emitters ( 1 ) gradually increase or decrease as it goes from the first irrigation drip emitter positioned at or near the first end of the irrigation line tube towards the last irrigation drip emitter positioned at or near the second end of the irrigation line tube.