JP2010116899A - Ejector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejector device preventing suction of air into a steam ejector and heat transfer failure. <P>SOLUTION: A steam supply pipe 8 is connected to a suction chamber 2 of the steam ejector 1. The suction chamber 2 of the steam ejector 1 is connected to a re-evaporation tank 13. An air sump part 7 is formed on an upper part of the re-evaporation tank 13, and is connected to a suction chamber 16 of a water ejector 3. A gas discharge means 10 is interposed between the water ejector 3 and re-evaporation tank 13. Condensate collected in a bottom of the re-evaporation tank 13 is supplied to the water ejector 3 by a liquid pressure-feeding member 17, and suction force is generated in the suction chamber 16 of the water ejector 3, and the air collected in the air sump part 7 of the re-evaporation tank 13 is sucked through the gas discharge means 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ejector device in which drive steam is ejected from a nozzle at high speed and a steam ejector that generates suction force in a suction chamber by the velocity energy of the fluid is combined.

  In the ejector device, a steam pipe is connected to the inlet side of the suction chamber containing the nozzle, an outlet pipe is connected to the outlet side of the diffuser, and the suction chamber of the steam ejector is connected to the upper part of the re-evaporation tank. The steam re-evaporated in the evaporation tank can be used effectively.

In this ejector device, the air mixed in the re-evaporation tank is sucked into the steam ejector together with the re-evaporated vapor and supplied from the outlet pipe to a separate steam use location. There was a problem that caused. This is because air hinders the heat transfer of steam.
JP2007-332859A

  The problem to be solved is to provide an ejector device in which air is not sucked into the steam ejector and heat transfer failure does not occur.

  The present invention relates to a nozzle part composed of pores for constricting fluid, a suction chamber formed around the nozzle part, a steam ejector comprising the suction chamber and the diffuser communicating with the nozzle part, and a suction of the steam ejector In the case where the chamber is connected to the reevaporation tank, the upper part of the reevaporation tank is connected to the suction chamber of the water ejector via the gas discharge means.

  In the ejector device according to the present invention, since the upper part of the reevaporation tank is connected to the suction chamber of the water ejector, the air mixed into the reevaporation tank is sucked into the water ejector and is therefore sucked into the steam ejector. Therefore, it is possible to provide an ejector device that does not cause poor heat transfer at the location where steam is used.

  As the ejector of the present invention, a conventionally used ejector can be used, and an ejector comprising a nozzle, a suction chamber provided with a suction port, and a diffuser part can be used, and the drive fluid is vaporized. A steam ejector that uses water and a water ejector that uses water as the driving fluid are used.

  In FIG. 1, an ejector includes a steam ejector 1, a suction chamber 2 containing a nozzle portion, a diffuser 4, an outlet pipe 5 connected to an outlet side portion of the diffuser 4, a re-evaporation tank 13, and a water ejector 3. Configure the device.

  A driving steam supply pipe 8 is connected to the inlet side of the suction chamber 2 of the steam ejector 1. A pressure control valve 6 for controlling the supplied steam pressure is interposed in the steam supply pipe 8. The steam ejector 1 is composed of a suction chamber 2 and a diffuser 4 each having a nozzle portion. A suction passage 12 into which re-evaporated vapor sucked in the suction chamber 2 flows is provided at the lower end of the suction chamber 2 and is connected to the upper portion of the re-evaporation tank 13.

  The reevaporation tank 13 has a horizontally long cylindrical shape, and a high-temperature condensate inflow pipe 14 is connected to the upper left portion. An air reservoir 7 is formed on the upper right side of the reevaporation tank 13, and one end of the air suction passage 9 is connected to the upper end of the air reservoir 7. A gas discharge means 10 is attached in the middle of the air suction passage 9. The gas discharge means 10 can be equipped with an automatic air vent valve conventionally used, or a manual valve that can exclude gas by manually opening and closing the valve. This gas discharge means 10 can discharge the air mixed in the fluid flowing down in the passage 9 out of the system.

  The outlet side of the gas discharge means 10 is connected to the suction chamber 16 of the water ejector 3. The inlet side of the suction chamber 16 of the water ejector 3 is connected to a liquid pumping line 18 of the liquid pumping member 17 described later. In addition, a condensate discharge pipe 15 is connected to the center of the lower end of the reevaporation tank 13.

  The liquid pumping member 17 has a condensate inlet 19 and a condensate outlet 20, a high-pressure operation steam inlet 21 and a steam outlet 22, and a condensate discharge pipe is connected to the condensate inlet 19 via a check valve 23. 15 is connected. The check valve 23 allows the condensate to flow from the condensate discharge pipe 15 into the liquid pumping member 17 and prevents the flow in the opposite direction.

Similarly, the liquid pumping line 18 is connected to the condensate outlet 20 via a check valve 24. The check valve 24 has a function of allowing the condensate to flow from the liquid pumping member 17 to the liquid pumping pipeline 18 and blocking the flow in the opposite direction. A high-pressure steam pipe 25 branched from the steam supply pipe 8 is connected to the high-pressure operation steam inlet 21. The vapor discharge port 22 communicates with the upper left side surface of the reevaporation tank 13.

The liquid pumping member 17 closes the high-pressure operation steam inlet 21 and opens the steam outlet 22 when the float (not shown) disposed therein is located in the lower part, and then recovers from the re-evaporation tank 13. Water is caused to flow down into the liquid pumping member 17 through the condensate discharge pipe 15, the check valve 23, and the condensate inlet 19.

When condensate accumulates in the liquid pumping member 17 and a float (not shown) is positioned at a predetermined upper portion, the steam discharge port 22 is closed and the high-pressure operation steam introducing port 21 is opened, so that high-pressure pumping from the high-pressure steam pipe 25 is performed. By causing the steam for use to flow into the interior, the condensate accumulated therein is fed to the water ejector 3 through the condensate outlet 20, the check valve 24 and the liquid pressure feed line 18.

  When the condensate is pumped and the liquid level in the liquid pumping member 17 is lowered, the high pressure operation steam inlet 21 is closed again, and the steam outlet 22 is opened, so that the condensate is discharged from the reevaporation tank 13 to the inside. Flow down. By repeating such an operation cycle, the liquid pumping member 17 can intermittently supply the condensate in the reevaporation tank 13 to the water ejector 3.

  Inside the re-evaporation tank 13, the high-temperature condensate flowing in from the high-temperature condensate inflow pipe 14 is re-evaporated and becomes steam again, and is sucked into the suction chamber 2 of the steam ejector 1 from the suction passage 12. Condensate whose temperature has decreased to some extent due to re-evaporation accumulates at the bottom of the re-evaporation tank 13.

 Condensate collected at the bottom of the re-evaporation tank 13 is supplied to the water ejector 3 by the liquid pumping member 17, generating a suction force in the suction chamber 16 of the water ejector 3, and entering the air reservoir 7 of the re-evaporation tank 13. By sucking the accumulated air through the gas discharge means 10, the air in the re-evaporation tank 13 is not sucked into the steam ejector 1.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam ejector 2 Suction chamber 3 Water ejector 4 Diffuser 5 Outlet pipe 7 Outlet pipe 8 Air supply part 10 Steam supply pipe 10 Gas discharge means 12 Suction passage 13 Re-evaporation tank 14 High temperature condensate inflow pipe 15 Condensate discharge pipe 17 Liquid pressure feed member 18 Liquid pressure feed Pipeline

Claims (1)

Re-evaporating the nozzle part composed of a pore for narrowing the fluid, a suction chamber formed around the nozzle part, a steam ejector comprising the suction chamber and the diffuser communicating with the nozzle part, and the suction chamber of the steam ejector What is connected to a tank, The ejector apparatus characterized by connecting the upper part of the re-evaporation tank with the suction chamber of the water ejector via the gas discharge means.

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