JPS6029680Y2 - vacuum pump equipment - Google Patents

Description

[Detailed description of the invention] A condenser that cools and condenses steam used in a steam turbine or the like has a high degree of vacuum inside the condenser, so leakage air flows into the condenser along with the steam.

In order to improve the condensation efficiency, it is necessary to constantly suck out the leaked air using a vacuum pump device to maintain a high degree of vacuum inside the vessel, and it is also desirable to be able to measure this degree of vacuum.

This invention relates to an improved vacuum pump device that maintains a high degree of vacuum inside the condenser to improve condensation efficiency and also allows the degree of vacuum to be measured.

As shown in FIG. 1, this type of conventional vacuum pump device includes a rotary vacuum pump 2 connected to a steam separator 1 on the discharge side;
an ejector-type vacuum pump 3 connected to the suction side of the vacuum pump 2; the leakage air discharge side of the condenser 4 is connected to the suction side of the ejector-type vacuum pump 3; It was connected to the suction side of the rotary vacuum pump 2 via a bypass valve 5 of No. 3.

The ejector type vacuum pump 3 was designed to suck in operating air from the air discharge side of the upper part of the steam/water separator 1 as shown by arrow P.

The steam/water separator 1 separates air containing mist water discharged from the discharge side of the rotary vacuum pump 1 into air and water,
A portion of the separated air is sucked out from the upper part of the steam/water separator 1 as operating air for the ejector type vacuum pump 3 as described above, and the rest is discharged to the outside through the discharge pipe 6.

An air flow meter 7 is attached to the discharge pipe 6 so that the amount of air discharged through the pipe 6 can be measured.

Further, the water separated by the steam-water separator 1 is collected from the lower part as a sealing liquid for the rotary vacuum pump 2 as shown by the arrow W.

In order to create a vacuum inside the condenser 4, if the degree of vacuum inside the condenser 4 is low, first the bypass valve 5 is opened and the rotary vacuum pump 2 is operated.

When the degree of vacuum in the condenser 4 increases as the rotary vacuum pump 2 operates, the bypass valve 5 is then closed.

In this state, the rotary vacuum pump 2 can sufficiently draw in operating air for the ejector-type vacuum pump 3 from the air discharge side of the steam/water separator 1, and the operating air is pumped inside the ejector-type vacuum pump 3. Adiabatic expansion from atmospheric pressure to vacuum region results in supersonic flow.

The ejector type vacuum pump 3 is used to supplement the performance of the rotary type vacuum pump 2 in the high vacuum region, and is used to remove steam and leakage air from the condenser 4 by the action of the supersonic flow of working air. The air-fuel mixture is sucked out as indicated by arrow R.

The air-fuel mixture is discharged from the discharge side of the ejector type vacuum pump 3 together with working air, and is sucked into the rotary type vacuum pump 2.

Since the working air is circulated in a constant amount, the condenser 4
The leaked air sucked out from inside is separated from moisture by the steam separator 1 and then discharged to the outside through the discharge pipe 6.

At this time, the degree of vacuum in the condenser 4 can be determined by measuring the amount of discharged air, that is, the amount of leaked air in the condenser 4 using the air flow meter 7.

If the amount of leaked air is abnormally large, the steam turbine, condenser 4, piping, etc. will be inspected.

In such a conventional structure, the air separated from water by the steam/water separator 1, that is, the operating air of the ejector type vacuum pump 3, still contains a large amount of mist moisture.
This has the drawback that the suction capacity of the ejector-type vacuum pump 3 is reduced, which makes it difficult to maintain a high degree of vacuum in the condenser 4 and improve condensation efficiency.

In order to eliminate the above-mentioned drawbacks, this invention aims to provide a vacuum pump device that maintains a high degree of vacuum inside the condenser to improve condensation efficiency, and also allows the degree of vacuum to be measured. .

In order to achieve the above-mentioned purpose, this invention is equipped with a rotary vacuum pump connected to a steam separator on the discharge side and an ejector type vacuum pump connected to the suction side of the vacuum pump. In a vacuum pump device that creates a vacuum inside, a switching valve is provided so that the working air of the ejector type vacuum pump can be sucked in from a steam separator or the outside, and the switching valve is operated to transfer the working air to a condenser. It is constructed by drawing in from the steam/water separator only when measuring the degree of vacuum inside, and drawing in from the outside at all times.

Hereinafter, embodiments of this invention will be described based on the drawings.

Figure 2 shows a vacuum pump device based on this invention.
Components designated by the same reference numerals as in FIG. 1 are the same parts.

In the pump device shown in this figure, a switching valve 21 is provided between the air discharge side of the upper part of the steam/water separator 1 connected to the discharge side of the rotary vacuum pump 2 and the suction side of the ejector type vacuum pump 3. There is.

This switching valve 21 is for allowing operating air for the ejector type vacuum pump 3 to be sucked in from the steam/water separator 1 or from the outside. By operating the switching valve 21, the vacuum level inside the condenser 4 can be The water is inhaled from the steam/water separator 1 only when measuring the water, and is normally inhaled from the outside as shown by the arrow Q.

The degree of vacuum in the condenser 4 is known by measuring the amount of air discharged to the outside through the discharge pipe 6 of the steam separator 1 using an air flow meter 7.

Exhaust air when the ejector-type vacuum pump 3 sucks working air from the outside is discharged to the outside through a discharge pipe 22 provided at the upper part of the steam/water separator 1.

Air valve 2 connected to the suction side of ejector type vacuum pump 3
3 is for adjusting the amount of operating air.

As mentioned above, according to this invention, the operating air of the ejector type vacuum pump is discharged from the rotary vacuum pump only when measuring the degree of vacuum in the vacuum device in the condenser by switching the switching valve. Inhale from a steam separator connected to the side,
The vacuum pump device is configured so that the switching valve is normally operated again to draw air in from the outside, so during normal operation, a vacuum is created by using outside air with low moisture content as operating air for the ejector-type vacuum pump. The effect is that the capacity is improved, the inside of the condenser is maintained at a high degree of vacuum, and the condensation efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional vacuum pump device, and FIG. 2 is a block diagram showing a vacuum pump device according to this invention. 1... Steam water separator, 2... Rotary vacuum pump, 3... Ejector type vacuum pump, 4...
...Condenser, 21...Switching valve.

Claims (1)

[Scope of utility model registration request] In a vacuum pump device that evacuates the inside of a condenser, the vacuum pump device includes a rotary vacuum pump having a steam separator connected to the discharge side and an ejector type vacuum pump connected to the suction side of the vacuum pump. A switching valve is installed to draw in the working air of the vacuum pump from a steam separator or from outside air, and by operating this switching valve, the working air is separated into steam and water only when measuring the degree of vacuum in the condenser. A vacuum pump device that draws air from outside air at all times.