Draining device

Abstract

A draining device includes a draining mechanism, two conduits, and a driving mechanism. The draining mechanism includes a first cylinder defining a cavity, a first cover and a connecting member mounted on two opposite ends of the first cylinder respectively, a piston rod extending through the connecting member, and a first piston assembly mounted on the piston rod. The first cover defines a first draining hole, the connecting member defines a second draining hole. The two conduits is coupled to the first cylinder corresponding to the first and the second draining holes respectively, and communicating with the cavity. Each of the two conduits includes a first conduit and a second conduit. A first and a second check valves are positioned in the first and the second conduits respectively. The driving mechanism is mounted on the connecting member, configured to drive the piston rod to slide in the first cylinder.

What is claimed is: 
     
         1 . A draining device for draining fluid, the draining device comprising:
 a draining mechanism including:
 a first cylinder having opposite ends and defining a cavity; 
 a first cover defining a first draining hole; 
 a connecting member defining a second draining hole; 
 a piston rod extending through the connecting member and partially received in the cavity; and 
 a first piston assembly mounted on an end of the piston rod and received in the cavity, wherein the first cover and the connecting member are respectively mounted on the opposite ends of the first cylinder; 
   two conduits coupled to the first cylinder and communicating with the cavity through the first and second draining holes, respectively, each of the two conduits comprising:
 a first conduit communicating with the first and second draining holes; 
 a first check valve positioned in the first conduit and configured to enable fluid to flow from the cavity towards the first conduit; 
 a second conduit spaced from the first conduit and communicating with the first and second draining holes; and 
   a second check valve positioned in the second conduit and configured to enable fluid to flow from the second conduit towards the cavity; and   a driving mechanism mounted on the connecting member and configured to drive the piston rod to slide in the first cylinder.   
     
     
         2 . The draining device of  claim 1  , wherein the connecting member comprises a mounting portion protruding from a periphery thereof; the mounting portion is a flange, and defines a mounting slot configured to receive a sealing member. 
     
     
         3 . The draining device of  claim 1  , wherein the piston rod comprises a main body extending through the connecting member; a sealing member is positioned between the main body and the connecting member. 
     
     
         4 . The draining device of  claim 3  , wherein the piston rod further comprises a first fixing portion and a second fixing portion on opposite ends of the main body; the first piston assembly is sleeved on the first fixing portion and the driving mechanism is positioned on the second fixing portion. 
     
     
         5 . The draining device of  claim 4 , wherein the main body defines a first receiving hole at a periphery thereof; the receiving hole is adjacent to the first fixing portion and extends along radial direction of the main body; the first fixing portion defines a second receiving hole on an end thereof; the second receiving hole is away from the main body and extending along an axis of the first fixing portion; the second receiving hole extends into the main body and communicates with the first receiving hole. 
     
     
         6 . The draining device of  claim 3 , wherein the first piston assembly comprises a mounting base mounted on the piston rod, and a magnetic member sleeved on the mounting base. 
     
     
         7 . The draining device of  claim 6 , wherein the first piston assembly further comprises a piston body sleeved on the piston rod; the piston rod is positioned on a side of the magnetic member adjacent to the first cover. 
     
     
         8 . The draining device of  claim 7 , wherein the first piston assembly further comprises a sealing ring positioned on an outer surface of the piston rod and resisting against an inner surface of the cover. 
     
     
         9 . The draining device of  claim 7 , wherein the first piston assembly further comprises two cushions; one of the cushion is positioned on a surface of the mounting base facing the connecting member; the other cushion is positioned on a surface of the piston body departing from the magnetic. 
     
     
         10 . The draining device of  claim 7 , wherein the piston rod further comprises a connecting portion on an end of the main body; the first piston assembly further comprises a securing member, the securing member is sleeved on the piston rod adjacent to the piston body. 
     
     
         11 . The draining device of  claim 10 , wherein the connecting portion is equipped with an external thread on an outer surface thereof, the securing member threads to the connecting portion to fix the first piston assembly. 
     
     
         12 . The draining device of  claim 1 , wherein the driving mechanism comprises a second cylinder, a second cover, and a second piston; the second cylinder couples to an end of the connecting member away from the first cylinder and defines a cavity configured to partially receive the piston rod; the second cover is positioned on an end of the second cylinder away from the connecting member; the second piston assembly is sleeved on the piston rod and received in the second cylinder. 
     
     
         13 . The draining device of  claim 12 , wherein the connecting member further defines a first air inlet at a periphery thereof; the second cover defines a second air inlet thereon; the first air inlet and the second air inlet both communicate with the cavity of the second cylinder. 
     
     
         14 . A draining device, comprising:
 a draining mechanism including:
 a first cylinder having opposite ends and defining a cavity; 
 a first cover defining a first draining hole; 
 a connecting member defining a second draining hole; 
 a piston rod extending through the connecting member and partially received in the cavity; and 
 a first piston assembly mounted on an end of the piston rod and received in the cavity, wherein the first cover and the connecting member are respectively mounted on the opposite ends of the first cylinder;; 
   two conduits coupled to the first cylinder and communicating with the cavity through the first and second draining holes, respectively, each of the two conduits comprising:
 a first conduit communicating with the first and second draining holes; 
 a first check valve positioned in the first conduit and configured to enable fluid to flow from the cavity towards the first conduit; 
 a second conduit spaced from the first conduit and communicating with the first and second draining holes; and 
 a second check valve positioned in the second conduit and configured to enable fluid to flow from the second conduit towards the cavity. 
   
     
     
         15 . The draining device of  claim 14 , further comprising a driving mechanism mounted on the connecting member and coupling to the piston rod; the driving mechanism is a four-bar mechanism capable of driving the piston rod and the first piston assembly to slide reciprocally in the first cavity. 
     
     
         16 . The draining device of  claim 14 , further comprising a driving mechanism mounted on the connecting member and coupling to the piston rod; the driving mechanism is a feed screw-nut mechanism capable of driving the piston rod and the first piston assembly to slide reciprocally in the first cavity. 
     
     
         17 . The draining device of  claim 14 , wherein the connecting member comprises a mounting portion protruding from a periphery thereof; the mounting portion is a flange, and defines a mounting slot configured to receive a sealing member. 
     
     
         18 . The draining device of  claim 14 , wherein the piston rod comprises a main body extending through the connecting member, a first fixing portion and a second fixing portion on opposite ends of the main body; the first piston assembly is sleeved on the first fixing portion. 
     
     
         19 . The draining device of  claim 18 , wherein the main body defines a first receiving hole at a periphery thereof; the receiving hole is adjacent to the first fixing portion and extends along a radial direction of the main body; the first fixing portion defines a second receiving hole on an end thereof; the second receiving hole is away from the main body and extending along an axis of the first fixing portion ; the second receiving hole extends into the main body and communicates with the first receiving hole. 
     
     
         20 . A draining device, comprising:
 a draining mechanism comprising:
 a first cylinder defining a cavity and comprising a bottom on a end thereof, the bottom defining a first draining hole; 
 a connecting member defining a second draining hole, and being mounted on an end r oppositely to the bottom; 
 a piston rod extending through the connecting member and partially received in the cavity; and 
 a first piston assembly mounted on an end of the piston rod and received in the cavity; 
   two conduits coupled to the first cylinder and communicating with the cavity through the first and second draining holes, respectively, each of the two conduits comprising:
 a first conduit communicating with the first and second draining holes; 
 a first check valve positioned in the first conduit to allow a flow to flow out from the cavity towards the first conduit; 
   a second conduit spaced from the first conduit and communicating with the first and second draining holes; and
 a second check valve positioned in the second conduit to allow a flow to flow out from the second conduit towards the cavity( ) and 
   a driving mechanism mounted on the connecting member and configured to drive the piston rod to slide in the first cylinder, comprising:
 a second cylinder with a bottom coupled to an end of the connecting member away from the first cylinder and defining a cavity configured to partially receive the piston rod, the bottom of the second cylinder being away from the connecting member; and 
 a second piston assembly sleeved on the piston rod and received in the second cylinder.