Anti-siphon and pump priming for sewage grinder pump |
|||||||
| 申请号 | US39846973 | 申请日 | 1973-09-18 | 公开(公告)号 | US3857517A | 公开(公告)日 | 1974-12-31 |
| 申请人 | ENVIRONMENT ONE CORP; | 发明人 | GRACE R; VAN LUIK F; | ||||
| 摘要 | Sewage enters and fills a receiving tank to a predetermined maximum level before being pumped through a discharge passage by means of a grinder and pump, with a check valve being provided in the discharge passage to prevent back flow of sewage, in combination with a conduit connected to the discharge passage between the pump pressure side and the back flow preventing check valve. The conduit provides air through a differentially operable check valve to the discharge line for anti siphoning protection and will further provide reverse air flow from the pump into the tank to prime the pump as well as to prevent discharge of liquid sewage out of the conduit into the tank. The conduit opens above the maximum predetermined level that actuates the grinder-pump, and is well above the pump suction inlet and pump working chamber. There are no other outlets or inlets between the tank interior and the dishcarge line or pump chamber so that the unit can be sealed closed at the factory but may be easily primed upon installation and provides anti siphoning protection. | ||||||
| 权利要求 | 1. An anti-siphoning pumping system for liquids comprising a receiving tank having an inlet and an outlet, pump means having a suction inlet below the liquid level in said tank for tanking suction on the contents of the tank and discharging the same under increased pressure from an outlet, a discharge passage connected to the outlet from said pump means for discharging liquid from said tank under pressure through said tank outlet, first check valve means coupled to said discharge passage permitting fluid flow only in the direction from said pump outlet to said tank outlet and to prevent backflow of pressurized liquid, conduit means connected at one end to said discharge passage between said first check valve means and said pump outlet, said conduit means being freely open at its other end to a source of venting gas, and second differentially operable check valve means within said conduit means for passing gaseous fluids through said conduit means in either direction and for preventing the passage of liquid from said one end to said open end of said conduit means. 2. An anti-siphoning pumping syStem according to claim 1 further including level control means for actuating the pump means upon the liquid within the tank reaching a predetermined maximum level, and wherein the pump means has its suction inlet substantially below the maximum level, the open end of said conduit means opens directly into the receiving tank at a level substantially above said predetermined maximum level, and the receiving tank is vented to atmosphere. 3. An anti-siphoning pumping system according to claim 2 wherein the system comprises a sewage pump grinder for grinding and discharging under pressure raw sewage collected in the receiving tank, a sewage grinder macerator mounted within the pump suction inlet to grind sewage before it passes through the pump means, the pump means comprises a positive helical screw-type pump employing a flexible boot with an internal helical surface in cooperative working engagement with a rigid shaft having an external helical surface, but of a different pitch, the discharge from said helical screw-type pump being directly connected to said discharge passage, the inlet to said pump means being mounted below said maximum predetermined level and said maximum predetermined level being below the open end of said conduit means; said conduit means and said second differentially operable check valve means constituting pump priming means for relieving build-up gaseous fluids and allowing liquid sewage to rise through the suction inlet into the flexible boot of the pump means as the liquid sewage within said tank rises to said predetermined maximum level that actuates the pump means. 4. An anti-siphoning pumping system according to claim 3 wherein said conduit means and said second differentially operable check valve means comprise anti-siphon means for preventing the removal of the pump liquid prime and liquid from said tank below the level of the point of connection of the conduit means to the discharge passage upon vacuum being produced in said discharge line due to siphoning whereupon said anti-siphon means allows removal of the liquid sewage in said discharge line down to the point of connection of said conduit means and thereafter provides passage of venting air through said conduit means open end and through said second differentially operable check valve means into said discharge line. 5. An anti-siphoning pumping system according to claim 4 wherein said discharge passage is permanently sealed with respect to the interior of said tank between said pump discharge head and said conduit means. 6. A sewage grinder pump for taking suction on a sewage collection tank that receives liquid sewage containing entrained solids from a sewage generating site, said sewage grinder pump having a discharge passage and a suction inlet and being adapted to be mounted within a collection tank for taking suction on the contents of the tank and discharging ground liquid slurry sewage under pressure from the discharge passage to a pressurized sewage main, first check valve means coupled to said discharge passage for permitting ground liquid slurry flow only in one direction from said discharge passage to the pressurized sewage main and to prevent backflow of pressurized liquid slurry sewage, and second differentially operable check valve means coupled to a source of venting gas and to said discharge passage at a point intermediate the first check valve means and the grinder pump for passing gaseous fluids in either direction through said discharge passage to or from said grinder pump preventing flow of liquid therethrough in a direction from said discharge passage to said source of venting gas and allowing liquid sewage collected in the tank to rise within the grinder pump for self-priming said grinder pump, reducing transient loads on the grinder pump during start-up and anti-siphon protection. 7. A sewage grinder pump according to claim 6 further including sewage level control means for sensing the liquid sewage level and actuating the grinder pump upon the sEwage level in a collection tank reaching a predetermined maximum level, and wherein the grinder pump is adapted to have its suction inlet substantially below the predetermined maximum liquid level of a collection tank upon being mounted therein, and the second differentially operable check valve means opens directly into a collection tank in which the grinder pump is mounted at a level substantially above the predetermined maximum level. 8. A sewage grinder pump according to claim 7 wherein said grinder pump comprises a positive helical screw-type pump employing a flexible boot with an internal helical surface in cooperative working engagement with a rigid shaft having an external helical surface, but of a different pitch, the discharge from said helical screw-type pump being directly connected to said discharge passage, the grinder pump being mounted in a collection tank below the maximum predetermined level and the maximum predetermined level being below the open end of the conduit means; the conduit means and the second differentially operable check valve means constituting pump priming means for relieving build-up of gaseous fluids and allowing liquid sewage to rise through the suction inlet into the flexible boot of the grinder pump as the liquid sewage within a collection tank rises to a predetermined maximum level that actuates the grinder pump. 9. A sewage grinder pump according to claim 8 wherein the conduit means and the second differentially operable check valve means also comprise anti-siphon means for preventing the removal of the pump liquid prime and liquid from a collection tank below the level of the point of connection of the conduit means to the discharge passage upon a vacuum being produced in the discharge passage due to siphoning whereupon said anti-siphon means allows removal of the liquid sewage in said discharge passage down to the point of connection of the conduit means and thereafter provides passage of venting air through the conduit means open end and through the second differentially operable check valve means into the discharge passage. 10. A low pressure sewage grinder pump system including in combination a collection tank, grinder means having its inlet taking suction on the liquid sewage contents of the tank and discharging ground liquid slurry sewage from an outlet, positive displacement pump means having an inlet connected to the outlet from said grinder means and providing a discharge flow of ground liquid slurry sewage under pressure from its outlet irrespective of the pressure head into which the discharge is directed, a discharge passage connected to the outlet from said pump means for discharging ground liquid slurry sewage from said tank under pressure, first check valve means within said discharge passage permitting liquid sewage flow only in the direction from the outlet of said pump means to the receiving point and preventing backflow of pressurized liquid sewage, first conduit means connected at one end to said discharge passage and freely open at its other end to a source of venting gas, second differentially operable anti-siphon check valve means within said first conduit means for passing gaseous fluids through said conduit means in either direction and for preventing the passage of liquid sewage from said one end to said open end of said first conduit means. 11. A low pressure sewage grinder pump system according to claim 10 wherein said positive displacement pump means comprises a positive helical screw-type pump employing a flexible boot with an internal helical surface in cooperative working engagement with a rigid shaft having an external helical surface, but of a different pitch, the discharge from said helical screw-type pump being directly connected to said discharge passage, said first conduit means and said second differentially operable check valve means comprising pump priming means for relieving build-up of gaseous fluids in the pump means and allowing liquid sewage to rise through the suction inlet into thE flexible boot of the pump means as liquid sewage accumulates within the collection tank to some predetermined maximum level and actuates the pump means. 12. A low pressure sewage grinder pump system according to claim 11 wherein said first conduit means and said second differentially operable check valve means also comprise anti-siphon means for preventing the removal of the pump liquid prime and liquid from said collection tank below the level of the point of connection of the first conduit means to the discharge passage upon a vacuum being produced in said discharge line due to siphoning, said anti-siphoning means allowing removal of liquid sewage in said discharge line down to the point of connection of said first conduit means and thereafter providing passage of venting gas through said first conduit means open end and through said differentially operable check valve means into said discharge line. 13. A low pressure sewage grinder pump system according to claim 12 wherein said discharge passage is permanently sealed with respect to the interior of said collection tank between said outlet from said pump and said first conduit means, the interior of said collection tank is vented to the atmosphere, said first conduit means is sealed and uninterrupted between its one end connected to the discharge passage and its open end save for the second differentially operable check valve means and the open end of said first conduit means opens directly into said collection tank at a level substantially above the maximum predetermined level of sewage collected in the tank. 14. A low pressure sewage grinder pump including in combination grinder pump means designed for mounting within the interior of a sewage collection tank and having an inlet taking suction on the liquid sewage contents of the tank and discharging ground liquid slurry sewage from an outlet; said grinder pump means including positive displacement pump means having its inlet connected to the outlet from the grinder means and providing a discharge flow of ground liquid slurry sewage under pressure from its outlet irrespective of the pressure head into which the discharge is directed, a discharge passage connected to the outlet from said pump means for discharging ground liquid slurry sewage from said tank under pressure; first check valve means within said discharge passage permitting liquid sewage flow only in the direction from the outlet of said pump means and preventing backflow of pressurized liquid sewage; first conduit means connected at one end to said discharge passage and freely open at its other end to a source of venting gas; and second differentially operable anti-siphon check valve means within said first conduit means for passing gaseous fluids through said conduit means in either direction and for preventing the passage of liquid sewage from said one end to said open end of said first conduit means. 15. A low pressure sewage grinder pump according to claim 14 wherein said positive displacement pump means comprises a positive helical screw-type pump employing a flexible boot with an internal helical surface in cooperative working engagement with a rigid shaft having an external helical surface, but of a different pitch, the discharge from said helical screw-type pump being directly connected to said discharge passage, said first conduit means comprising pump priming means for relieving build-up of gaseous fluids in the pump means and allowing liquid sewage to rise through the suction inlet into the flexible boot of the pump means as liquid sewage accumulates within a collection tank in which the grinder pump is mounted to some predetermined maximum level. 16. A low pressure sewage grinder pump according to claim 15 wherein said first conduit means and said second differentially operable check valve means also comprise anti-siphon means for preventing the removal of the pump liquid prime and liquid from a collection tank in which the grinder pump is mounted below the level of the point of connectiOn of the first conduit means to the discharge passage upon a vacuum being produced in said discharge line due to siphoning, said anti-siphoning means allowing removal of liquid sewage in said discharge line down to the point of connection of said first conduit means and thereafter providing passage of venting gas through said first conduit means open end and through said differentially operable check valve means into said discharge line. 17. A low pressure sewage grinder pump according to claim 16 wherein the collection tank in which the grinder pump is designed to be mounted is vented to atmosphere, the discharge passage is permanently sealed with respect to the interior of the collection tank in which the grinder pump is mounted between the outlet from said pump and said first conduit means, said first conduit means is sealed and uninterrupted between its one end connected to the discharge passage and its open end save for the second differentially operable check valve means and the open end of the first conduit means is designed to open directly into the collection tank in which the grinder pump is mounted at a level substantially above the maximum predetermined level of sewage collected in the tank. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈