JP2013130148A - Ejector type vacuum pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ejector type vacuum pump requiring no use of an electric motor and no consumption of electric power.SOLUTION: A plurality of liquid pressure feed pumps 1, 2 are connected to an inlet side of an ejector 6, and a liquid tank 8 is connected to an outlet side of the ejector 6. Liquid inflow pipes 16, 17 which are disposed within the liquid tank 8 are arranged individually with a height difference. A sub-liquid tank 5 is connected above the ejector 6 by a predetermined distance, and a pipe path 11 is connected below the sub-liquid tank 5 and is further connected to a nozzle side inside a suction opening 3 of the ejector 6. The liquid pressure feed pumps 1, 2 are operated to work the ejector 6 and the liquid within the sub-liquid tank 5 is forced to flow down in the ejector 6 under hydraulic head pressure, providing an inexpensive ejector type vacuum pump using no consumption of electric power.

Description

 The present invention relates to an ejector type vacuum pump in which an ejector and pump means are combined. The ejector type vacuum pump generates a vacuum suction force in the ejector section by circulating a fluid in the ejector by a pump means, and has been conventionally used as a condensate suction recovery device from a low-pressure steam using device or the like. .

A conventional ejector-type vacuum pump includes a spiral pump, a circulation path connecting a discharge port and a suction port of the spiral pump, and an ejector and a tank disposed in the middle of the circulation path.

In the conventional ejector type vacuum pump, an electric motor has to be operated in order to drive the spiral pump, and there is a problem that a relatively large amount of electric power is consumed with the operation of the electric motor. In addition, various plants have explosion-proof areas for preventing explosion accidents. In such explosion-proof areas, there is a problem that a large amount of cost is required to make the electric motor explosion-proof specifications.

JP 7-253100 A

  The problem to be solved is to obtain an inexpensive ejector vacuum pump that does not require the operation of an electric motor and does not consume power.

  In the present invention, a liquid as a driving fluid is supplied to a nozzle of an ejector, and a separate fluid is sucked from a suction port on the outer periphery of the nozzle. A plurality of liquid pumps are provided on an inlet side of the ejector, and an outlet side of the ejector is provided. The liquid tanks are arranged in sequence, and the liquid inlets of a plurality of liquid pumps are arranged at different heights in the liquid tank, and the auxiliary liquid is placed at a predetermined distance above the ejector on the outlet side of the ejector. A tank is arranged, and the liquid that flows down to the ejector by the water head pressure from the sub liquid tank is used as a driving fluid for the nozzle.

  According to the present invention, the liquid inlets of the plurality of liquid pumps are arranged at different heights in the liquid tank, so that the liquid accumulated in the liquid tanks is sequentially supplied from the plurality of liquid pumps. An inexpensive ejector vacuum pump that can be supplied to the nozzle, eliminates the need for an electric pump, and does not consume power can be provided.

The block diagram which shows the Example of the ejector type vacuum pump of this invention.

  In the present invention, a liquid pump is disposed on the outlet side of the ejector. However, the liquid pump can pump liquid using high-pressure compressed air or steam as a pump source without using an electric motor. Those are preferred.

  In this embodiment, a plurality of liquid pumps 1 and 2 disposed on the inlet side of the ejector 6, a liquid tank 8 disposed on the outlet side of the ejector 6, and a fluid suction pipe 4 connected to the suction port 3 of the ejector 6. And the example using the subliquid tank 5 arrange | positioned above the ejector 6 is shown.

  The outlet side of the ejector 6 is connected to the upper part of the liquid tank 8 by a conduit 9. The liquid tank 8 is a cylindrical sealed tank, and an overflow pipe 14 that can also discharge air and a cooling water supply pipe 15 that can supply cooling water to the liquid tank 8 are connected to the upper part of the liquid tank 8.

 The fluid suction pipe 4 is connected to the suction port 3 of the ejector 6. The left end of the fluid suction pipe 4 is connected to a condensate generator (not shown). A nozzle (not shown) is disposed inside the suction port 3 of the ejector 6.

  Two liquid pumps 1 and 2 are disposed below the liquid tank 8 and connected to the liquid inlets 25 and 30 via liquid inflow pipes 16 and 17 whose upper ends are opened inside the liquid tank 8. . The liquid inflow pipe 17 opens at the bottom in the liquid tank 8, and the liquid inflow pipe 16 opens at the top of the liquid tank 8, so that the liquid inflow pipe 17 is arranged with a height difference.

The liquid pumping pump 1 has a liquid inlet 25 and a liquid outlet 26, and a high-pressure pumping fluid introduction port 27 and a high-pressure pumping fluid discharge port 28. The liquid pumping pump 2 includes a liquid inlet 30 and a liquid stream. It has an outlet 31, a high-pressure pumping fluid introduction port 32, and a high-pressure pumping fluid discharge port 33. The liquid outlets 26 and 31 are connected to the nozzles in the suction port 3 of the ejector 6 by pipe lines 34 and 35, respectively.

Although not shown, the liquid inflow pipes 16 and 17 are each equipped with a check valve that allows only passage of fluid in one direction. This check valve allows passage of fluid from the liquid tank 8 to the liquid pumps 1 and 2 and prevents passage in the opposite direction. Pipe lines 34 and 35 are connected to the liquid outlets 26 and 31 via check valves (not shown), and a high-pressure vapor source is connected to the high-pressure pumping fluid inlets 27 and 32. Further, the high-pressure pumping fluid discharge ports 28 and 33 communicate with the atmosphere.

The liquid pumps 1 and 2 close the high-pressure pumping fluid inlets 27 and 32 and open the high-pressure pumped fluid outlets 28 and 33 when a float (not shown) disposed inside is located in the lower part. The liquid accumulated in the liquid tank 8 is caused to flow down into the liquid pumps 1 and 2 through the liquid inlets 25 and 30. When the liquid accumulates in the liquid pumps 1 and 2 and a float (not shown) is located at a predetermined upper portion, the high-pressure pumping fluid discharge ports 28 and 33 are closed, while the high-pressure pumping fluid inlets 27 and 32 are opened. Then, the high-pressure pressure-feeding steam is caused to flow into the inside, whereby the liquid accumulated inside is pressure-fed from the liquid outlets 26 and 31 to the ejector 6.

  When the liquid is pumped with high-pressure steam and the liquid level in the liquid pumping pumps 1 and 2 is lowered, the high-pressure pumping fluid inlets 27 and 32 are closed again, and the high-pressure pumping fluid discharge ports 28 and 33 are opened, The liquid flows down from the liquid inlets 25 and 30 to the inside. By repeating such an operation cycle, the liquid pumps 1 and 2 pump the liquid from the liquid tank 8 to the ejector 6.

  The liquid inflow pipe 17 of the liquid pressure pump 1 opens at the upper end at the bottom in the liquid tank 8, and the liquid inflow pipe 16 of the liquid pressure pump 2 opens at the top of the liquid tank 8. When the liquid level of the liquid tank 8 is low, the liquid pumping pump 1 is driven, and when the liquid level of the liquid tank 8 is high, the liquid pumping pumps 1 and 2 are driven and long. A liquid is supplied to the ejector 6 over time, and the ejector 6 can generate a predetermined vacuum suction force.

  The sub liquid tank 5 is disposed at a position higher than the ejector 6 by a predetermined distance and above the liquid tank 8. The sub liquid tank 5 is connected to the ejector 6 by a branch pipe 10 that branches a pipe 9. A valve 12 is attached to the branch pipe 10. By adjusting the valve opening degree of the valve 12, a part of the liquid discharged from the ejector 6 can be stored in the sub liquid tank 5. A pipe line 11 is connected to the lower part of the sub liquid tank 5 and connected to the nozzle side inside the suction port 3 of the ejector 6. The liquid accumulated in the sub liquid tank 5 flows down in the nozzle of the ejector 6 by the water head pressure corresponding to the height up to the ejector 6, generates a vacuum suction force according to the velocity energy, and flows from the suction port 3 to the fluid. A predetermined fluid in the suction pipe 4 is sucked.

In order to continuously generate the vacuum suction force of the ejector 6, the liquid is supplied from the sub liquid tank 5 to the ejector 6 when the discharge from the liquid pumps 1 and 2 is interrupted. It is effective.

  It is not necessary to drive the electric motor by driving the liquid pumps 1 and 2 to operate the ejector 6 and causing the liquid in the sub liquid tank 5 to flow down in the ejector 6 by the hydraulic head pressure. It can be set as an inexpensive ejector type vacuum pump which does not consume.

  The present invention produces a vacuum suction force in the ejector portion by circulating a fluid in the ejector, and can be used for a condensate suction recovery device from a low-pressure steam using device or the like.

1, 2
Liquid pumping pump 3 Suction port 4 Fluid suction pipe 5 Sub liquid tank 6 Ejector 8 Liquid tank 9 Pipe line 10 Branch pipes 16, 17 Liquid inlet pipes 25, 30 Liquid inlet pipes 26, 31 Liquid outlet pipes 34, 35 Pipe lines

Claims (1)

Supplying liquid as drive fluid to the ejector nozzle and sucking a separate fluid from the suction port on the outer periphery of the nozzle. The liquid inlets of a plurality of liquid pumps are arranged at different levels in the liquid tank, and the sub liquid tank is arranged at a position higher than the ejector by a predetermined distance on the outlet side of the ejector. The ejector type vacuum pump is characterized in that the liquid flowing down to the ejector by the water head pressure from the sub liquid tank is used as the driving fluid for the nozzle.

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