JPS5916120B2 - condensate pump equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a condensate pump device that pumps condensate generated in steam-using equipment or the like to a high-pressure system such as a boiler or a condensate recovery pipe installed at a high place.

Conventionally, an injection nozzle of an ejector member is connected to the discharge side of a pump driven by an electric motor to eject condensate at high speed, and a vacuum is generated by reducing the static pressure due to the high-speed jet and condensing steam due to heat radiation cooling. The ejector member suction chamber, which opens at the end of the passageway, inhales condensate into a high-speed jet, and utilizes the increase in static pressure due to the decrease in the speed of the jet to forcefully send high-pressure condensate to the outflow passage. A condensate pump device is known in which a portion of water is circulated to the suction side of the pump and discharged into the ejector member to serve as a high-speed jet source.

In the above pump device, since steam is also sucked into the suction chamber of the ejector member along with condensate, the steam is cooled and condensed using the heat dissipation of the conduit provided from the diffuser of the ejector member to the pump suction side. By condensing water,
Always ensure that only condensate is sucked into the pump, prevent steam from being sucked into the pump, and prevent the pump from cavitating or seizing due to idling.
The object of the present invention is to provide a pump device that always has high operating efficiency and can operate safely and stably.

However, due to its structure, this pump device always circulates a portion of the condensate within the device and uses it as a high-speed jet source. Water circulates within the device, and the temperature of the condensate gradually rises due to the kinetic energy provided by the pump to which energy is supplied in excess of the amount of heat radiated.

Eventually, vaporized condensate will be sucked into the pump, causing the pump to seize due to idling or reduce efficiency due to cavitation.
For practical purposes, it was necessary to reliably control its operation.

In view of the above circumstances, the present invention installs a condensate storage container and a condensate level detection switch that detects the condensate level in the container in the condensate flow passage, and controls the operation of the electric motor that drives the pump according to the inflow state of condensate. and prevent the condensate circulating within the pump device from rising in temperature due to the kinetic energy of the pump, causing cavitation or seizure of the pump,
The object of the present invention is to ensure safe and stable operation of the pump device and to obtain a pump device that is easy to put into practical use.

Next, the present invention will be explained based on embodiments shown in the figures.

Reference numeral 1 denotes a pump driven by an electric motor 2, and an injection nozzle 5 of an ejector member 4 is disposed on the discharge side 3.

A suction port 20 opens into the suction chamber 6 of the ejector member 4 and communicates with the end of the condensate flow passage 7, and the end of the venturi diffuser 8 of the member 4 is connected to the suction side 10 of the pump 1 through a conduit 9.

Reference numeral 11 denotes a heat radiation fin provided on the outer surface of the conduit 9.

The conduit 9 still has an outlet 13 leading to a condensate outlet passage 12.
is open.

14 is a condensate storage container provided in the condensate flow passage 7,
An end of a condensate discharge passage 15 of a trap 17 for discharging condensate generated by steam-using equipment or the like is opened in the container 14 .

16 is a condensate amount sensing switch installed in the container 14, and the switch 16 opens and closes the power supply circuit 19 from the power source 18 to the electric motor 2 that drives the pump 1 according to the water level in the container 14. be.

In this embodiment, a generally widespread float type level switch is used as the water level sensing switch 16, but any other commonly used water level sensing switches, such as photoelectric or magnetic type switches, may be used. It is also possible to use

Next, its operation will be explained based on an example.

The figure shows that condensate discharged from the trap 17 through the discharge passage 15 flows into the condensate storage container 14 and accumulates therein, the water level sensing switch 16 closes the power supply circuit 19 to the electric motor 2 of the pump 1, and the pump 1 is operated. Indicates the state in which

In the pump device, a part of the condensate is sucked into the pump 1 and is discharged to the injection nozzle 5 of the ejector member 4, so that a static pressure is generated in the ejector member 4 due to the high-speed jet of condensate. In addition, with the help of heat dissipation cooling from the conduit 9, the suction chamber 6 in the member 4 is evacuated, and the condensate from the condensate storage container 14 is sucked into the jet through the inlet passage 7 and the suction port 20. do.

Furthermore, re-evaporated steam is also sucked in together with condensed water, but since the steam is cooled, it becomes condensed again and flows into the suction chamber 6 of the ejector member 4.
This lowers the pressure and helps the suction of condensate.

In this way, the condensate suctioned into the condensate jet is sent to the diffuser 8, and the condensate jet gradually decreases its speed and increases its pressure at the same time, and becomes higher than the pressure on the condensate outflow passage 12 side, and the condensate jet is sent to the diffuser 8. The water flows out from the outlet 13 to a high-pressure system such as a boiler or a condensate recovery pipe installed at a high place.

Also, a part of the condensate is circulated again to the suction side 10 of the pump 1 and becomes a source of high-speed jet flow.

At this point, if the flow of condensate into the condensate storage container 14 stops or if the amount of condensate in the container becomes so small as to fall below a predetermined level, the water level detection switch 16 switches the flow of water to the electric motor 2 that drives the pump 1. The power supply circuit 19 is opened, the electric motor 2 is stopped, and the circulation of condensate in the pump device is stopped.

Therefore, the condensate circulating in the pump device is circulated by the pump as a jet source, and the above-mentioned operation is repeated. It is possible to operate the pump device economically by starting and stopping the pump device according to fluctuations in the water level.

As described above, the present invention prevents the pumps of conventionally known condensate pump devices from decreasing in efficiency due to cavitation and from malfunctioning due to seizure due to idling, thereby ensuring safe and stable operation. It is possible to obtain a pump device which guarantees the above-mentioned conditions and can operate economically depending on the amount of condensate, which is effective in practical use.

[Brief explanation of drawings]

The figure is a sectional view showing one embodiment of the present invention, in which 1 is a pump, 2
5, 6.8 are injection nozzles, suction chambers and diffusers that constitute the ejector member 4, 7 is a condensate flow passage, 9 is a conduit, 12 is an outflow passage, 13 is an outlet, 14 is a condensate storage container, 15 is a condensate discharge passage, 16 is a water level sensing switch, 18 is a power source, 19 is a power supply circuit, and 20 is an inlet.

Claims (1)

[Scope of Claims] 1. An ejector member consisting of an injection nozzle, a suction chamber with a condensate inlet opening, and a venturi-type diffuser, and the injection nozzle and diffuser of the member are connected to the discharge side and the intake through a conduit with a condensate outlet opening. In the condensate pump device, the control mechanism includes a pump 7° connected to each side, an electric motor that drives the pump, and a control mechanism that controls the operation of the electric motor. Connect to business account. A condensate pump device configured to control the operation of the electric motor according to the condensate level in the container by a water level sensing switch disposed in a condensate storage container provided in a condensate flow passage.