JPS5810187A - Apparatus for judging capacity of feed water pump - Google Patents

Abstract

PURPOSE:To enable to judge the capacity of a feed water pump accurately without influence of pressure variation, by measuring the time required for the water level to reach a certain height, and comparing the measured time with a predetermined reference time. CONSTITUTION:The time required for the water level to be raised from zero to a level L through a height h under normal conditions is measured beforehand actually, and a reference time serving as a tolerable upper limit is preset in a timer or the like. The reference time can be also calculated arithmetically from the water feed rate of the pump and the quantity of water at the water head h. In case that the time required for the water level to reach the level L is compared with the reference time and an L-level signal is not produced even after passing of the reference time, an alarm is produced. Therefore, it is enabled to judge the capacity of pump accurately with no influence of pressure variation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for determining whether the capacity of a boiler feed pump is normal or not.

If the water supply pump malfunctions or wears out due to poor boiler operation, the normal operation of the boiler will of course be impaired.

If the drop is severe, the amount of evaporation will exceed the amount of water supplied, making it impossible to operate, which is dangerous. Although attempts have been made to determine 1
Since the discharge pressure fluctuates due to fluctuations in the pressure inside the can, the flow rate changes greatly, making it extremely difficult to determine whether the capacity has decreased.

The present invention eliminates the above-mentioned drawbacks of the conventional method by measuring the time it takes for the water level to reach a predetermined set water level from the state where one can of water is fully blown, and comparing it with a preset set time. , unaffected by short-term pressure fluctuations,
It is an object of the present invention to provide a water supply pump capacity determination device that can reliably determine the capacity of a pump.

The present invention will be explained with reference to the drawings based on examples.

1,! , l, and 4 are electrode rods as water level detection ends, the lower ends of which have different heights, and are each at H level.

They are M level, L level, and C level. Violence is the bottom of the boiler. Each level is.

H level...If this is exceeded, the water pump will stop M
Level: If the water level falls again and reaches F#, restart the water supply pump -5- L level: If it exceeds this level, start combustion. C level: Standard When the water surface comes into contact with each electrode rod 1, 2, 8, and 4f using the structure found in known water level detectors,
Each signal is emitted.

The water level detection end may be provided inside the can body of the boiler, or one
It may also be provided at a water level gauge located parallel to the can body or water pipe.

After all can water has been blown and before the boiler is restarted, the pressure inside one can is zero, so after confirming this,
Water is supplied from the water supply pump.

Thereafter, it is detected by the signal from the electrode rod 3 that the water level reaches 1, for example, the L level, and the one hour required until then is detected.

On the other hand, the normal state Ji1 when the water level rises from zero by h and reaches L level l! The time spent in the IC is actually measured in advance, and the set time as the upper limit for storage is set using a timer or the like. This set time can also be calculated from the water volume and pump water supply volume l for the water level difference hFc.
Pumps with large fluctuations in water supply volume may be used, so
It is preferable to determine and set the value based on the results of repeated actual measurements.

The time it takes for the water level to reach the L level mentioned above.

Compared to the set time above, 1 For example, even if the set time elapses, L
If no level signal is issued, it is assumed that the pump capacity is insufficient and an alarm is issued, and if necessary, a safety mechanism is activated to prevent combustion from starting even if an L level signal is subsequently issued.

The set water level can be selected arbitrarily, but if it is at L level or lower, combustion has stopped, so there is little danger even in an abnormal state.

The present invention starts from the start of water supply after one can of water is fully blown.

By detecting the time it takes to reach a predetermined water level and comparing it with a predetermined set time to determine the pump capacity, the capacity of the water supply pump can be reliably determined without being affected by pressure fluctuations. This makes it possible to provide a determination device, which has extremely great practical effects.

[Brief explanation of drawings]

5- The drawing is an explanatory diagram of a water level detection end according to an embodiment of the present invention. 1... Electrode rod depth... I 3... 1 4... I To... Bottom. Patent applicant: Ebara Corporation

Claims (1)

[Claims] 1. In the boiler water pump capacity judgment all, when restarting after blowing out all the water in one can, the time from the water pump starting to supply water to reaching the predetermined water level in the boiler is longer than the preset time. A water supply pump capacity determination device characterized in that it determines that the capacity of the water supply pump is insufficient and issues an alarm.