JP2012087631A - Liquid force-feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid force-feed device eliminated in the disassembling and cleaning of a strainer by a worker.SOLUTION: An ejector 5 is made to communicate with a circulation pump 13 by a driving fluid pipe 14. The driving fluid pipe 14 is branched to connect a force-feed path 6 and a branched pipe 15. A pressure sensing valve 4 is attached to the branched pipe 15. The outlet of the pressure sensing valve 4 is connected to the foreign matter filtering part 10 of the strainer 3. The strainer 3 is disposed in an underground pit 1 and a suction path 2 is connected to the inlet of the strainer 3. When fluid pressure in the driving fluid pipe 14 reaches set pressure or lower due to the clogging of the foreign matter filtering part 10 of the strainer 3 with the foreign matter like dust, the fluid is fed to the suction path 2 from the foreign matter filtering part 10 by the automatic opening of the pressure sensing valve 4, and the foreign matter filtering part 10 is automatically cleaned.

Description

The present invention relates to a liquid pumping device that can suck water collected in a pit with a liquid ejector and pump it to a predetermined location mainly in various plants, petrochemical complexes, and the like.

The liquid pumping device connects the driving fluid source and the ejector nozzle with a driving fluid pipe, forms a suction chamber around the nozzle, communicates the ejector diffuser with the pumping passage, and communicates the suction chamber with the liquid reservoir. A suction passage is provided, and rainwater collected in an underground pit can be sucked by an ejector and can be pumped to a predetermined location via a pumping passage.

  In this liquid pumping device, the foreign material scavenging part of the strainer that is generally attached to the suction passage is clogged in a relatively short time, and there is a problem that the operator has to disassemble and clean the strainer each time. Met.

JP 2005-120856 A

  The problem to be solved is to provide a liquid pumping device that does not require the operator to disassemble and clean the strainer.

According to the present invention, a driving fluid source and an ejector nozzle are connected by a driving fluid pipe, a suction chamber is formed around the nozzle, an ejector diffuser is communicated with a pumping passage, and a suction chamber is communicated with a liquid reservoir. In the case where a suction passage is provided, a strainer provided with a foreign matter scavenging part that scavenges foreign matter in the fluid is interposed in the suction passage, and pressure sensing that opens when the fluid pressure drops below the set value in the drive fluid pipe The outlet side of the pressure sensing valve is connected to the strainer's foreign material scavenging part via a valve.

  The liquid pumping apparatus of the present invention includes a strainer provided with a foreign material scavenging portion in the suction passage, and a pressure sensing valve that opens when the fluid pressure drops below a set value in the driving fluid pipe. By connecting the outlet side of the pressure sensing valve to the strainer foreign matter catching part, the foreign matter catching part of the strainer is clogged and the amount of fluid from the strainer is reduced, and the fluid pressure in the drive fluid pipe is When the pressure is less than the set value, the pressure sensing valve automatically opens and supplies the fluid to the foreign matter collecting portion of the strainer, whereby the foreign matter collecting portion is automatically cleaned.

The block diagram which shows the Example of the liquid pumping apparatus of this invention.

  The liquid pumping apparatus of the present invention uses a strainer. As this strainer, a conventionally known Y-type strainer can be used.

FIG. 1 is a configuration diagram of one embodiment of the present invention, and shows an example applied to pumping rainwater 7 accumulated in underground pits 1 provided in various factories. The suction passage 2, the strainer 3, the pressure sensing valve 4, the ejector 5, and the pressure feeding passage 6 disposed in the underground pit 1 as a liquid reservoir constitute a liquid feeding device.

A nozzle (not shown) is arranged in the suction chamber 8 of the ejector 5 and the upper end of the suction passage 2 is connected. A Y-type strainer 3 and a check valve 9 are sequentially interposed in the suction passage 2. The check valve 9 is a valve having a function of allowing passage of water from the suction passage 2 to the ejector 5 side but preventing passage of water in the opposite direction.

The Y-type strainer 3 connects the suction passage 2 to the inlet side, connects the outlet side to the check valve 9, and is provided with a foreign material scraping portion 10 extending obliquely in the upper left direction substantially at the center. The rainwater in the underground pit 1 that has flowed into the strainer 3 from the suction passage 2 is scavenged for foreign matters such as dust while passing through the foreign matter catching section 10 and sucked into the ejector 5.

The diffuser 11 of the ejector 5 is communicated with the pressure feed passage 6 through the pipe 12 and the circulation pump 13. The pipe line 12 is connected to a driving fluid pipe 14 that circulates and connects the circulation pump 13 and the ejector 5. The pressure sensing valve 4 is attached to a branch pipe 15 that branches a part of the drive fluid pipe 14. The pressure sensing valve 4 is automatically opened when the pressure of the fluid in the driving fluid pipe 14 falls below a set value, and connects the branch pipe 15 on the outlet side to the foreign material catching section 10 of the strainer 3.

By driving the circulation pump 13 and supplying the water in the drive fluid pipe 14 to the ejector 5, a suction force is generated in the suction chamber 8 of the ejector 5, and rainwater is drawn from the suction passage 2 through the strainer 3 and the check valve 9. 7 can be sucked. Part of the sucked water is pumped from the pumping passage 6 to a predetermined pumping point via the circulation pump 13 and circulated from the driving fluid pipe 14 to the ejector 5.

When the foreign material catching part 10 of the strainer 3 is clogged with foreign matters such as dust and the amount of fluid passing through the strainer 3 decreases and the fluid pressure in the drive fluid pipe 14 becomes lower than the set value of the pressure sensing valve 4, the pressure sensing valve 4 automatically opens and supplies the fluid from the foreign matter catching portion 10 of the strainer 3 to the suction passage 2 side, whereby the foreign matter catching portion 10 is automatically cleaned and peeled off from the foreign matter catching portion 10. The foreign matter thus made flows back into the underground pit 1 again.

  As described above, the foreign material scraping unit 10 is automatically cleaned, so that the strainer 3 need not be disassembled and cleaned by an operator.

  INDUSTRIAL APPLICABILITY The present invention can be used as a liquid pumping device that sucks water containing a large amount of foreign matter with an ejector.

DESCRIPTION OF SYMBOLS 1 Underground pit 2 Suction passage 3 Strainer 4 Pressure sensing valve 5 Ejector 6 Pressure feed passage 8 Suction chamber 9 Check valve 10 Foreign material removal part 11 Diffuser 13 Circulation pump 14 Drive fluid pipe 15 Branch pipe

Claims (1)

The drive fluid source and the ejector nozzle are connected by a drive fluid pipe, a suction chamber is formed around the nozzle, the ejector diffuser communicates with the pressure feed passage, and the suction passage communicates with the suction chamber and the liquid reservoir. In addition, a strainer provided with a foreign matter scavenging part that scavenges foreign matter in the fluid is interposed in the suction passage, and a pressure sensing valve that opens when the fluid pressure drops below a set value is interposed in the drive fluid pipe. In addition, the liquid pressure feeding device is characterized in that the outlet side of the pressure sensing valve is connected to the foreign matter scavenging portion of the strainer.