JPS61142386A - Water-sealed pump - Google Patents

Abstract

PURPOSE:To prevent change of suction capacity even if the temperature of supply water to a water-sealed pump is changed, by a method wherein a regulating valve, regulating a mixture ratio of a reflux water amount to a new feed water amount according to the degree of vacuum on the suction side, is located in a reflux piping running from a gas moisture content separator. CONSTITUTION:A reflux piping 3 is coupled to a gas moisture content separator 2 on the discharge side of a water-sealed pump 1, and a regulating valve 6, regulating a mixture ratio of a reflux water amount to a pump to a new feed water amount through detection of a pressure on the suction side by means of a pressure switch 11, is situated in the piping. When a pressure on the suction side is decreased to lower than a specified value, the regulating valve 6 increases a ratio of reflux water, but since the temperature of the reflux water is relatively high, suction performance of the pump is automatically deteriorated. When suction performance of the pump is excessively lowered due to an excessive increase in the temperature of pump working water, an amount of new feed water fed through a line 5 is increased with the aid of a regulating valve 6 to improve suction performance of the pump.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a water ring pump device in which the suction performance of the pump can be automatically adjusted.

[Prior art and its problems]

The suction performance of a water ring pump decreases as the temperature of the working water increases, and the temperature of the water supplied from the outside as working water changes depending on the air temperature. In order to control the suction performance within a certain range even when the temperature of the make-up water changes, generally an outside air inlet is provided on the intake side with its opening area adjustable, or a vacuum breaker is provided. The former method requires a lot of work to adjust the opening area according to the temperature of the make-up water, while the latter method has the drawback that the degree of vacuum on the intake side changes rapidly, which can lead to a hunting phenomenon.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a water ring type pump device that can automatically adjust the suction performance within a certain range even if the temperature of makeup water changes. purpose.

[Key points of the invention]

In order to achieve the above object, the present invention provides a regulating valve in a pipe that separates moisture in the exhaust gas with a steam water separator connected to the exhaust side of the pump and returns it to the pump as working water.
With this adjustment valve, the temperature of the working water can be adjusted by changing the mixing ratio of the amount of recirculated water and the amount of new makeup water depending on the degree of vacuum on the intake side.

[Embodiments of the invention]

The figure shows an embodiment of the present invention, in which a steam-water separator 2 is connected to the exhaust side of a water ring pump 1, and is configured to separate working water contained in the exhaust gas in the form of a mist from air. ing.

A part of the water separated from the air is returned from the lower part of the separator 2 through the piping 8 to the pump 1 by self-priming action, and is reused as working water. Other water and air separated from the air are discharged to the outside through drain pipes 4 and exhaust ports 2a provided on the side and top of the separator 2, respectively. A portion of the working water is newly replenished through the replenishment piping 5. A common regulating valve 6 is provided in the pipe 3.5 to adjust the amount of return water and the amount of new make-up water, respectively. This regulating valve 6 is an on-off valve 7.8
and a piston-shaped valve stem 10 supported in a cylinder 9 so as to be movable only in the axial direction.
The opening and closing operations are opposite to each other as the opening and closing operations are performed.

A pressure switch 1 is installed on the intake side of the pump 1 to detect the degree of vacuum.
1 is provided, and this pressure switch 11 is activated when the degree of vacuum deviates from a certain range. The valve stem 10 of the regulating valve 6 is a solenoid valve 12 that operates in conjunction with a pressure switch 11.
The movement is operated by .

According to the embodiment, when the vacuum on the suction side becomes higher than a certain range as the pump 1 is operated, the solenoid valve 12 is activated to open the on-off valve 7 and throttle the on-off valve 8, thereby reducing the amount of water from the separator 2. You can change the mixing ratio between the amount of reflux water and the amount of new makeup water. The reflux water has a higher temperature than the make-up water due to the work heat generated within the pump 1, so the temperature of the working water mixed with these water increases by increasing the amount of reflux water, which automatically reduces the suction performance of the pump 1. The degree of vacuum can be lowered by When the temperature of the working water becomes too high and the degree of vacuum falls below a certain range, the solenoid valve 12 operates again to throttle the on-off valve 7 and open the on-off valve 8, thereby reducing the amount of reflux water and increasing the amount of make-up water. temperature can be lowered automatically.

Using return water to replenish working water is also effective in saving makeup water when the temperature of the makeup water is low and the suction performance of the pump 1 is sufficient.

〔Effect of the invention〕

According to this invention, in a water ring type pump device, a regulating valve is provided in the piping that returns the moisture in the exhaust gas separated by the steam-water separator to the pump as working water, and the regulating valve adjusts the amount of water in accordance with the degree of vacuum on the intake side. By changing the mixing ratio between the amount of reflux water and the amount of new make-up water, the effect is that even if the temperature of make-up water changes, the temperature of the working water can be adjusted and the suction performance can be automatically controlled within a certain range. is obtained.

[Brief explanation of drawings]

The figure is a schematic configuration diagram of an embodiment of the present invention. 1... Pump, 2... Separator, 8... Piping, 6...
··Regulating valve. 〆1---------)

Claims (1)

[Claims] 1) A water ring type pump, a steam separator connected to the exhaust side of the pump to separate moisture in the exhaust gas and return it to the pump as working water, and a reflux pipe from this separator connected to the vacuum level on the intake side. A water ring type pump device characterized by comprising a regulating valve that adjusts the mixing ratio of the return water amount and the new make-up water amount accordingly.