JPS5847189A - Method of controlling number of pumps - Google Patents

Abstract

PURPOSE:To prevent particular pumps from a burden by determining operating time of each pump on the basis of integrated value of the operating time to unify the operating time and number of times of starting. CONSTITUTION:In step 30 is supplied the input of integrated operating time value of each circulating pump. In step 31 is judged whether or not said values of the respective pump are all equal, and in step 32 is determined initial operation sequence when said values are all equal. If said values are not equal, the operating sequence is determined in step 33 on the basis of integrated operating time values of said pumps. In step 34 is made advance to step 35 if water level reaches operating one. In step 35 is read the number of operating pumps to send the operating signal outputs of pumps to a pump controller. In step 38 is judged whether or not some pumps should be stopped. In step 39 is reset the operating signal of pump which is cleared after count value of an operating time timer is stored. Further in step 40 is renewed integrated operating time value memory and judged whether or not all pumps should be stopped to repeat the above- mentioned operations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides efficient water level control in water plants.
This will control the number of Pong meetings lc@.

Regarding the method of controlling the number of pumps, equalizing the operating time and number of activations of each pump by 8 is a superimposition because all pumps are used under the same conditions. In the method of controlling the number of pumps at IE Yoneeda Jutsuko, after deciding on the number of operation sessions, the method of selecting the operation order is manually selected according to a predetermined pattern.
Or, by automatically changing T, the operating time and number of starts can be equalized.

The problem with this control method is that when manually selecting the operating order of the pumps, the operator must read the cumulative operating time and the cumulative number of startups of all pumps, and use these values in a predetermined pattern. It requires a high level of judgment to ensure uniformity within the process. Next, automatically select the operation order (this change T
In this case, the setting of the pump operation order is changed every time the number of pumps in operation changes.

Although the operating time and number of starts are made uniform after this, the above settings are repeatedly set, and the change in the number of pumps in operation is uneven due to the tlL amount fluctuation number. Therefore, it is difficult to achieve equalization during long-term control, and the operator must perform corrective operations.

The present invention was made based on the above reasons, and the startup of each pump (the impact on the equipment) was evaluated by converting it into 118 operating hours.
We provide a method for controlling the number of pumps in operation that can equalize the pump operating time and number of startups even during long-term control by determining the operating order of contact pumps. ◆Aimed at.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 shows a flow sheet exemplifying a standard system for the water distribution process and a number control device t, and the water distribution process is a simplified representation of the actual water distribution equipment.

After the sand water 1 is stored in the bong chamber 2, it is sent to the water pump 3 #t6
After detection, the water level signal 7 is inputted to the operating number determination circuit 8. 7t is determined by the operation number determining circuit 8.
4 Seedling rotation number deviation number 9 determines the operation order setting times % 10f trowel pump operation number and order.

The operating signal 11 is input to the pump control device 12, and each water pump 3 is controlled by a water pump control command 13 from the water pump control device 12.

FIG. 2 is a publicly known method for determining the number of water pumps for five water pumps, which is determined by the number determining circuit No. 8. The axis at 9 represents the water level of the water distribution reservoir, 7, and is set up to level 14 and level 16 at the time when the number of units is decided at j38.

Level 18 is the starting water level of the water pump, level 14 is the first starting water level, level 15 is the second starting water level, and thereafter, level 18 is the fifth starting water level. From level 19, the level gauge is the stop water level of the water pump, and level 19i; E is the stop water level of the 11th unit, level addition is the stop water level of the second unit, and similar to F. This level 23 is the stop water level of the fifth unit. . The third factor is a flowchart showing a method of setting the driving order in the prior art by the driving sequence setting circuit 10, and the details of the actual flowchart are simplified and shown.

Step 24 is a step of selecting a leading machine as a 0-period condition, and this can be applied externally or predetermined.

A case in which light emission from the first unit is given on a step road will be explained below in 6c.

For Stetsuno 6, the operating order setting for 9 cases is as follows: 2nd machine - 2nd machine, 3rd machine - 3rd machine, 4th machine = 4
The fifth machine is set as machine No. 5, and in response to the operating machine number signal 94, the operating machine No. 91 and 11 are output. , the water pump 3 is operated, and when the water level 7 of the water distribution reservoir reaches the level 19, which is the all-unit stop water level, the operation signal 11i of the water pump 3 is reset, and the process moves to step 3.

In the step song, the 2nd machine is the first machine, the 2nd machine is the 3rd machine, the 3rd machine is the 4th machine, the 4th machine is the 5th machine, and the 5th - 1st machine is operated in the same manner as in Step 5. , step n
From the beginning to f In the same manner, the process sequentially moves from step n to step path, step okara step path, and from step path to step δ, and the driving order setting is automatically changed. According to this method, the flow rate i of water distribution 5 to consumers changes (therefore, the operating time and number of operating units change at each step, so it is difficult to accurately equalize the operating time and the number of starts.

FIG. 4 is a flowchart showing an operation order setting method according to the present invention by the operation order setting circuit IO. This program starts the water pump by specifying automatic operation,
This ends when automatic operation is canceled and can be easily realized using a sequence controller.

First, in step I, the cumulative operating time of each water pump is input.

H, = Unit 1 operating time integrated value, H1 = Unit 2 n, = s machine operating time calculation.

Next, in step 31, check whether the total operating time 1 of each water pump read in step (material) is the same.
1'1lll'rL, if they are all the same, move to the step north. In step &, the initial driving order is determined. Here, a predetermined fitting order is determined.

For example, define the following: 1st machine = 1st machine, 2nd machine = 2nd machine, 5th machine = 5th machine. If it is determined in step 31 that the cumulative operating hours of the valley water pumps are not all the same,
Based on the accumulated operating time of each water pump in the step, the operating order shown below is determined.

1st gold = H1fi smallest bong 2nd gold = Bot 1 with the second smallest H 5 white = H is the largest pump.

Next, the step tool determines whether the water pump is in operation based on the operation number signal 9, and if the operating water level has been reached, the step goes to step A. Number of water supply bongs operated at Step A, including a.
Step '364 The trowel outputs the water pump operation signal 11% of the desired number of operating units to the pump 11I controller. In step n, the operating time timer of the started water pump is set.

Further, the step is determined from the operation number signal 9 to determine whether or not the water supply pump is to be stopped, and if there is a water supply pump that is lagging behind the stop water level, the process proceeds to Stella 739. In the step song, the delivery number of the water pump that has reached the stop water level is reset, and the count value Tn of the operating time timer set in step 39 is saved and cleared. In the rough step, the memory of the cumulative operating time of the water pump that has finished operating is updated.

Therefore, the cumulative operating time value Hn of unit n is Hn ”” H
a 10Tn + N 11KTn: Operation time count value of unit n (hours) N 2 Number of starts
[times] K: Constant [
time 7 times].

Here, the constant is used to compensate for the deterioration of the insulation of the winding, etc., which is applied to the motor when the pump is started 81 times, during the operating time. Therefore, the starting method of the motor and the CD that the motor bears are more strange than this.

In addition, in step 41, all the water pumps have a total stopping force of 1, and if all units are not floating, return to step 34 and repeat the process up to the step cut-off. . The number of rotations N is N = 1, which updates the memory after one operation in Flow: 7-1'-) in Fig. 44, but it does not update the memory after several operations. It doesn't matter.

Furthermore, if all the water pumps are stopped, the program ends from step 42 at 4'lJIML, and if it is executed, returns to the step garden and executes the program based on the new operation time cumulative value.
Repeat the same process.

As explained above, according to the present invention, by calculating and comparing the operating times that take into account the number of times of starting of all pumps, the order of pump operation to equalize the operating time and number of starting times of all pumps. Therefore, it is possible to provide an effective method for controlling the number of t-pumps, which prevents damage to bearings, deterioration of insulation of connections, etc. due to the concentration of operating time and startup frequency on specific pumps.

[Brief explanation of drawings]

Fig. 11a is an example diagram of the flow &-) of the water distribution process and the number control device, Fig. 2 is a diagram showing a method for determining the number of five water pumps, and Fig. 3 is a flowchart showing a method for setting the operating order in the conventional technology. , FIG. 4 is a flowchart showing the operation order setting circuit of the present invention. l...Water purification, 2...Bonbuna, 3...Water pump, 4...Water reservoir, 5...Water distribution, 6...
Water level needle, 7...Water level signal, 8...Number of operating units determining circuit, 9...Number of operating units signal, lO...Operating order setting circuit 11...Interlocking deviation 12...Pump control system 1
3...Pump control command (7317) Representative Patent Attorney Keisuke Noriko (and 1 other person)
Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In the pump number control method that controls the water level using multiple pumps of the same amount as the answer, the operating time of each pump is accumulated, and -
Convert the number of startups into operating time and add it to the cumulative time above.
A method of controlling the number of pumps with the aim of equalizing the operating time and number of activations of all the pumps by determining the operating time based on this cumulative operating time value.