Negative Pressure Pipeline Opening and Closing Device

Abstract

A negative pressure pipeline opening-and-closing device includes a blocking member and a buoyant member. The buoyant member comprises two floats and a connection rod connected to the two floats. The liquid reservoir is provided with a guide therein, and the guide confines the two floats, the blocking member and the liquid outlet port in the same vertical line. A limiting member is arranged between the two floats and is fixed to an inner wall of the liquid reservoir. A maximum distance between the limiting member and a top wall of a lower float of the two floats is smaller than a maximum distance between a top wall of an upper float of the two floats and a top wall of the liquid reservoir. The negative pressure pipeline opening-and-closing device can replace an existing electrically controlled valve. Therefore, the cost is reduced, the maintenance is convenient and service life is prolonged.

What is claimed is: 
     
         1 . A negative pressure pipeline opening-and-closing device, wherein:
 the negative pressure pipeline opening-and-closing device comprises a blocking member for blocking a liquid outlet port of a liquid reservoir and a buoyant member connected to the blocking member,   the buoyant member comprises a float and a first connection rod, wherein one end of the first connection rod is pivotably connected to an inside of the liquid reservoir, the first connection rod is rotated around a hinge point in a vertical plane, and the float is connected to a location of the first connection rod far away from the hinge point,   the blocking member comprises a blocking element and a second connection rod, wherein the second connection rod is pivotably connected to the inside of the liquid reservoir and is rotated around the hinge point in a vertical plane, the blocking member is connected to a location of the second connection rod far away from the hinge point, and the liquid outlet port of the liquid reservoir is located in a motion path of the blocking member that moves as the second connection rod moves, and an opening portion of the liquid outlet port is perpendicular to a tangential direction of the motion path, and   the negative pressure pipeline opening-and-closing device further includes an energy transferring member, wherein the energy transferring member transmits the potential energy of the buoyant member to the blocking member to drive the blocking member to rotate around a hinge point of the blocking member.   
     
     
         2 . The negative pressure pipeline opening-and-closing device according to  claim 1 , wherein:
 the energy transferring member includes a first triggering element on the first connection rod, a second energy receiving element on the second connection rod, and an intermediate energy transferring element,   the intermediate energy transferring element is pivotably connected to the inside of the liquid reservoir, the intermediate energy transferring element is rotated around the hinge point in the vertical plane, and a rotation path of the intermediate energy transferring element and a motion path of the first triggering element and the second energy receiving element cross each other,   the intermediate energy transferring element is further provided with a third energy receiving element and a third triggering element,   a rotation path of the first triggering element and a rotation path of the third energy receiving element cross each other, and   a rotation path of the third triggering element and a motion path of the second connection rod cross each other.   
     
     
         3 . The negative pressure pipeline opening-and-closing device according to  claim 1 , wherein:
 a second triggering element is fixed on and perpendicular to the intermediate energy transferring element,   the second triggering element is located in a rotation plane of the intermediate energy transferring element and extends toward the second energy receiving element,   the liquid outlet port of the liquid reservoir is located in a motion path of the blocking member that moves as the second connection rod moves, and   an opening portion of the liquid outlet port is perpendicular to a tangential direction of the motion path.   
     
     
         4 . The negative pressure pipeline opening-and-closing device according to  claim 2 , wherein a first weight is fixed at an end of the intermediate energy transferring element far away from the hinge point,
 a motion path of the first weight passes directly above the hinge point of the intermediate energy transferring element, and   the third triggering element lies in a line of the first weight and a hinge point between the first weight and the intermediate energy transferring element in a location far away from the first weight.