JP2665996B2 - Pump operating condition detection method and lubricating water supply method for pump bearings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an operating state of a pump and a method for supplying lubricating water to a bearing of the pump.

[0002]

2. Description of the Related Art For example, as a bearing for a vertical shaft pump, a ceramic bearing capable of performing stable operation by lubricating and cooling by self-lifting water is employed. In this type of bearing, after a very short time has elapsed immediately after the start of the pump, the bearing is immediately lubricated and cooled by self-lifting water and enters a stable operation. That is, since the dry operation is limited to a short time, wear and seizure of the ceramic bearings can be avoided and stable operation can be performed.

On the other hand, with the rapid progress of urbanization, the amount of rainwater flowing into drainage stations installed in waterways has become large and rapid. In such a situation, even if the water level of the water intake well at the drainage station falls to the pumping interruption water level of the vertical shaft pump, the dry operation is continued, and the preliminary standby operation or the air management operation that precedes the operation state of the pump is performed. It responds by doing. In the vertical shaft pump used for the preliminary standby operation or the air management operation, the dry operation is performed for a long time, and during this time, lubricating water is not supplied to the bearing. Therefore, a ceramic bearing whose dry operation is limited to a short time could not be adopted for the vertical shaft pump that performs the preliminary standby operation or the air management operation.

As a means for solving such a problem, it is conceivable to supply lubricating water to the bearing from the outside. In this case, although the pumping operation (draining operation) is being performed, the lubricating water is supplied from the outside. It is pointless to continue supplying lubricating water. Therefore, by measuring the water level of the water intake well, if the water level is lower than the preset water level, that is, if the water level is lower than the pumping start water level of the vertical shaft pump, lubricating water is supplied to the bearing. The method of supplying the water was adopted. However, in such a method of supplying the lubricating water to the bearing based on the water level of the water absorption well, it is necessary to consider the case where the water surface of the water absorption well is calm and the case where the water surface is wavy. In consideration of the above case, it is necessary to set the lubrication water supply stop water level high enough to allow for a margin.

However, in such a control method, when the water surface is relatively calm, lubricating water is supplied even though the pumping operation is being performed. That is, since the operating state of the pump cannot be accurately detected, useless supply of lubricating water is performed.

[0006]

The problems to be solved are that the operating condition of the pump cannot be detected accurately and that the operating condition of the pump cannot be detected accurately. The point is that useless lubricating water is supplied.

[0007] Accordingly, the present invention provides a pump in which the pump is operated in a regular drainage operation.
Status, air / water mixed operation status or airborne operation status
Being able to accurately detect whether the vehicle is in a driving situation
The main purpose is to operate the pump, and the other
Lubrication water supply to bearings based on accurate detection of the situation
Is to be able to eliminate waste.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above main object.
In order, a first aspect of the invention, the pump impeller inlet and the air detected by the intake air conditions intake state detection means in the intake pipe for communicating the intake amount and the fluctuation factor measurement means the detected intake state signal type intake air amount of the intake gas state and to measure the variation value, the operating conditions of the pump on the basis of the intake air amount and the variation value of the measured intake air condition, the intake air amount of 0 to
The normal drainage operation status and the fluctuation value of the intake air amount
Gas-water mixing operation and the intake air amount
To distinguish the aerial operation situation when serial smaller than the set range is characterized in the Turkey issue test <br/>.

[0009] In order to achieve the above another object, the invention of claim 2, an intake state of the intake pipe for communicating the inlet with the atmosphere of the pump impeller detected by an intake state detection unit, which is the detected enter the intake state signal to the intake air amount and fluctuation measuring means measures the intake air amount and the variation value of the intake air condition, the operating conditions of the pump on the basis of the intake air amount and the variation value of the measured intake air conditions, the intake air amount Normal when is 0
If the fluctuation value of drainage operation status and intake air amount is larger than the set range
The water / mixing operation condition and the intake air fluctuation
It is detected separately from the in-air driving condition when it is smaller than
Stops supplying lubricating water from the lubricating water supply system to the bearing of the pump main shaft when detecting the normal drainage operation state and the air-water mixing operation state, and detects the above-described in-air operation state
Supply lubricating water from the lubricating water supply system to the pump spindle bearing
And characterized by performing the lubrication water supply stop control so as to feed
Is what you do.

[0010]

SUMMARY OF] According to the present invention, the intake gas state of the intake pipe detected by the intake state detecting means, the intake air amount of the intake gas state by entering the detected intake state signal to the intake air amount and fluctuation measuring means And measure the variation. On the other hand, the operating state of the pump, the intake state of the intake pipe, the intake air amount in the intake state, and the fluctuation value have a fixed relationship depending on the operating state of the pump. That is, the intake air amount in the intake state becomes 0 in the normal drain operation state in which 100% drainage amount is secured, and the fluctuation of the intake air amount in the intake state in the air- water mixed operation state in which the intake operation is performed with the drain amount decreased. The value is large, and in the in-air operation state where the pump is running idle, the intake air amount is very small and its fluctuation value is small. Therefore, the above intake
Detection of the intake state by state detection means and the intake amount and
The measurement of the intake air volume and the fluctuation value by the fluctuation value measurement means
The current operating status of the pump is
Or an amount that is in the drainage operation conditions of normal becomes 0, the intake air amount
If the water / water mixture operation condition
Or the fluctuation value of the intake air amount is smaller than the above set range.
No matter what aerial driving situation, it is clearly distinguishable and accurate
Can be detected.

[0011] According to the second aspect of the invention, the billing
Accurately determine the current operating status of the pump in the same manner as in the invention of Item 1.
Based on accurate detection results, correct drainage operation status and
When detecting the mixing operation status, stop supplying the lubricating water and
Control to supply lubricating water when detecting in-air operating conditions.
By doing so, during normal drainage operation and air-water mixing operation
Supply of lubricating water and power consumption for
It is possible to save money.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a vertical shaft pump to which the present invention is applied. The main shaft 2 of the pump 1 is substantially equivalent to a bearing 5 fixed to a base of a guide vane 4 above an impeller 3 and a floor surface 7 of a water absorption well 6. is rotatably supported by a bearing 8 fixed at the same height level, it is rotationally driven by a drive source 9 such as a motor or an engine if example embodiment. The bearings 5 and 8 are each formed of ceramics such as silicon carbide, and lubricating water for lubrication and cooling is supplied from a lubricating water supply system 10 to each. The lubricating water supply system 10 includes a lubricating water supply source 10A,
A pipeline 10B for supplying lubricating water from 0A to the bearings 5, 8;
It is constituted by a valve 10C such as an electromagnetic valve or an electric ball valve provided in the pipe 10B. Therefore, valve 10
When the valve C is opened, the lubricating water is supplied from the lubricating water supply source 10A to the bearings 5 and 8, and when the valve 10C is closed, the supply of the lubricating water to the bearings 5 and 8 is stopped .

An intake pipe 11 is provided below the impeller 3, that is, an intake pipe 11 for communicating the air with the inlet of the impeller 3, and the intake pipe 11 detects intake state such as intake amount or intake speed. Twelve detection sensors 12a are interposed. The intake state signal detected by the intake state detection unit 12 is input to the intake amount and variation value measurement unit 13, where the intake amount and variation value in the intake state are measured. The intake air amount and fluctuation value signal in the inhalation state is input to the comparison circuit 14 from the intake air amount and fluctuation value measuring means 13. The intake amount and the fluctuation reference value in the intake state are input to the comparison circuit 14 from a setter 15 having a selector. The comparison circuit 14 compares the intake air amount and the fluctuation reference value input from the setting device 15 with the intake air amount and the fluctuation value input from the intake air amount and the fluctuation value measuring means 13 to obtain the intake air amount in the intake state. Is 0 or the intake air amount is not 0 and the fluctuation value is larger than the intake air amount fluctuation reference value, the valve 10
When a closing signal Sh for closing C is output and a display signal is output to the first display 16 and the intake amount in the intake state is not 0 and the variation value is smaller than the intake amount variation reference value, A closing signal 0p for opening the valve 10C is output and a display signal is output to the second display 17. Incidentally, the comparison circuit 14 and the setter 15 is incorporated in the controller 19.

Next, a method of detecting the operating condition of the vertical shaft pump and a method of supplying lubricating water to the bearings 5 and 8 will be described. The operating state of the pump 1 and the intake air amount and the fluctuation value in the intake state of the intake pipe 11 have a fixed relationship depending on the operating state of the pump 1. That is, even if a suction negative pressure generated at the inlet (the impeller chamber) of the impeller 3 by operating the pump with the water level of the water absorption well 6 is applied to the intake pipe 11, no air is sucked from the intake pipe 11. When the level is equal to or higher than the level WL1, the normal drain operation is performed and the intake air is 0. In a region where the water level of the water absorption well 6 is reduced to a level WL2 at which air is sucked into the intake pipe 11, while sucking air by a suction negative pressure generated at the inlet of the impeller 3,
Drainage operation will be performed. At this time, the intake air amount increases with a decrease in the water level, and thus the drainage amount gradually decreases. During such a gas-water mixing operation, the fluctuation value of the intake state is large due to the fluctuation of the water level of the water absorption well 6 or the waving of the water surface. In addition, when the water level of the water intake well 6 falls below the level WL2, the pumping is interrupted and only the air is sucked by the suction negative pressure generated at the inlet of the impeller 3, so that the influence of the water surface fluctuation is reduced. Since it is not received, the fluctuation value of the intake state becomes small. Therefore, when the pump 1 is in the normal drain operation, the intake air in the intake pipe 11 becomes 0, and the intake air amount detecting means 1
2 detects a state where the intake air of the intake pipe 11 is 0, and outputs an intake state signal of 0 from the intake air amount and fluctuation value measuring means 1.
Enter 3 Therefore, the comparison circuit 14 outputs the value of the valve 10C.
, And outputs a display signal to the third display 18 to detect the normal drainage operation state of the pump 1. In this case, the bearings 5, 8 are lubricated and cooled by the self-lifting water drawn by the impeller.

On the other hand, when the pump 1 is in the gas-water mixing operation, the intake state of the intake pipe 11 is detected by the intake state detecting means 12, and an intake state signal is input to the intake quantity and fluctuation value measuring means 13 from this. The intake air amount and fluctuation value in the inhalation state are measured from the intake air amount and fluctuation value measuring means 13, and the intake air amount and fluctuation value signal in the inhalation state are input to the comparison circuit 14. FIG.
As shown in FIG. 2B, an intake state variation set value H0 that is smaller than the intake state variation value H1 during the air-water mixing operation and greater than the intake state variation value H2 during the in-air operation is input in advance. ing. Therefore, the comparison circuit 14 of FIG. 1 compares the intake state variation reference value H0 with the intake state variation value H1, and
A closing signal Sh for closing the valve 10C is output, and a display signal is output to the first display 16 to detect a gas-water mixing operation state of the pump 1. In this case, the bearings 5, 8 are lubricated and cooled by the self-lifting water drawn by the impeller.

On the other hand, when the pump 1 is operating in the air, the intake state of the intake pipe 11 is detected by the intake state detecting means 12, and an intake state signal is input to the intake quantity and fluctuation value measuring means 13 from this. The intake air amount and the fluctuation value in the intake state are measured, and the intake air state fluctuation value signal H2 (see FIG. 2B) during the in-air operation smaller than the intake state fluctuation reference value H0 is obtained from the intake air amount and fluctuation value measuring means 13. It is input to the comparison circuit 14. Therefore, the comparison circuit 14 compares the intake state variation reference value H0 with the intake state variation value H2, outputs an opening signal Op for opening the valve 10C, and outputs a display signal to the second display 17. , The in-flight operation state of the pump 1 is detected. By opening the valve 10C, lubricating water is supplied to the bearings 5 and 8 from the lubricating water supply source 10A, and the bearings 5 and 8 are lubricated and cooled.

As described above, the lubricating water supplied from the lubricating water supply source 10A lubricates and cools the bearings 5 and 8 during the in-air operation of the pump 1, so that the dry operation is continued for a long time. The ceramic bearings 5 and 8 can also be used for the vertical pump 1 that performs the standby operation and the air management operation. It is needless to say that the present invention is not limited to the vertical shaft pump 1 described in the above embodiment, but may be applied to other pumps capable of performing aerial operation. In the embodiment, immediately after the intake state detection means 12 detects the intake state of the intake pipe 11, the intake state detection means 1
2 describes that the intake state signal is input to the intake air amount and fluctuation value measuring means 13.
The intake state signal may be input to the intake amount and fluctuation value measuring means 13 after a lapse of a predetermined time (for example, about 10 seconds) from the point in time at which the intake state of the intake pipe 11 is detected by 2.

[0018]

According to the present invention as described above, according to the present invention, based on operating conditions of the pump and the intake shape of the intake air amount and fluctuation value and the intake state of the intake pipe in the fixed relationship, the current
Pump operation status is set to zero when the intake volume of the intake pipe is in the intake state.
Is the normal drainage operation condition,
Check if the air-water mixture operation is larger than the set range.
Or, if the fluctuation value of the intake air amount is smaller than the set range,
It is clearly distinguished whether it is in the middle driving situation and accurately detected
This has the effect of being able to

According to the second aspect of the present invention, the above-mentioned claim is provided.
In the same manner as in the first invention, an accurate
Based on the detection result, the self during drainage operation and during the steam-water mixing operation legitimate can be lubricated and cooled the bearing by pumping to stop the supply of the lubricating water, and, self-pumping bearing lubrication and cooling impossible by Lubricating water during aerial operation
By controlling the supply of oil to the bearings, it is possible to use ceramic bearings as the bearings for the pump that performs the preliminary standby operation and the air management operation, but at the time of regular drainage operation and
Waste supply of lubricating water during water mixing operation
Power consumption can be reduced.
I do .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vertical shaft pump to which an embodiment of the present invention is applied.

FIG. 2A is a graph showing the relationship between the air-water mixing operation of the pump and the intake air state fluctuation value, and FIG. 2B is a graph showing the relationship between the air-driven operation of the pump and the intake air state fluctuation value. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Main shaft 5 Bearing 8 Bearing 10 Lubricating water supply system 11 Intake pipe 12 Intake state detection means 13 Intake amount and fluctuation value measurement means

Claims (2)

(57) [Claims] 1. An intake state detection means detects an intake state of an intake pipe for communicating an inlet of a pump impeller with the atmosphere, and
The detected intake state signal is input to the intake air amount and fluctuation measuring means measures the intake air amount and fluctuation value of the intake state operating conditions of the pump on the basis of the intake air amount and the variation value of the measured intake air conditions Is the regular exhaust when the intake air amount is 0.
When the fluctuation value of the water operation status and the intake air amount is larger than the set range
The air / water mixing operation status and the intake air amount fluctuation value
Operating condition detecting method of the pump, wherein the benzalkonium be detected separately care during operation situation when Ri small. 2. An intake state detection means detects an intake state of an intake pipe for communicating an inlet of the pump impeller with the atmosphere,
The detected intake state signal is input to the intake air amount and fluctuation measuring means measures the intake air amount and fluctuation value of the intake state operating conditions of the pump on the basis of the intake air amount and the variation value of the measured intake air conditions Is the regular exhaust when the intake air amount is 0.
When the fluctuation value of the water operation status and the intake air amount is larger than the set range
The air / water mixing operation status and the intake air amount fluctuation value
Detected while distinguishing from the in-air driving situation when the
Supply of lubricating water from the lubricating water supply system to the bearing of the pump main shaft when detecting the normal drainage operation status and the air / water mixing operation status
Is stopped, and when the above-mentioned in-air driving condition is detected,
Lubricating water is supplied from the water supply system to the bearing of the pump spindle
Lubricant supplying method for a bearing of the pump, characterized in that performing the lubrication water supply stop control to.