JP7128620B2 - PUMP CONTROL DEVICE AND PUMP OPERATING METHOD - Google Patents

Description

The present invention relates to a pump control device and a pump operating method.

The manhole pump device installed at the sewage relay pumping station consists of a manhole that stores sewage that flows in from the inflow pipe at the end of the sewage conveying pipe, a submersible pump that pumps the sewage stored in the manhole to the outflow pipe, and a manhole that stores sewage. It is equipped with a water level sensor that measures the water level of the discharged sewage.

Such a manhole pump device has a control unit that starts the submersible pump when the water level measured by the water level sensor reaches a predetermined pump starting water level, and stops the submersible pump when it reaches a pump stopping water level lower than the pump starting water level. It has

Submersible pumps installed in manholes are designed to drain the maximum inflow of sewage, so a model with a large capacity is selected. In some cases.

By the submersible pump started at the pump start water level, sewage is pumped to the outflow pipe, and as the water level decreases, the pumping head increases and the pumped water volume decreases. In other words, as the pump approaches a fixed water level at which the pump is stopped, the efficiency is gradually lowered and the operation shifts to a region of high head and small amount of water.

JP 2006-057567 A

Drainage facilities such as manhole pumps are designed based on the planned drainage volume set in advance. In such a situation, if the pump is pumped to a fixed pump stop water level, the efficiency will be low and the operation will include a high head area, resulting in a problem that the amount of power consumption per unit of water supply will increase. rice field.

In addition, even after the population density has reached a pre-estimated scale, there may be cases where the actual drainage volume is less than the planned drainage volume due to population decline, etc. There is a problem that power consumption per unit amount of water is increased when the water is pumped to the water level.

Such problems are not limited to manhole pump equipment, but include pump equipment that supplies water to water distribution sites (water distribution tanks), pump equipment that prepares for irrigation water, and water to be treated from tanks to tanks at sewage treatment plants. The same was true for the pump equipment for transfer.

SUMMARY OF THE INVENTION In view of the above-described problems, an object of the present invention is to effectively use the capacity of the pump equipment and control the start and stop of the pump to operate, thereby effectively suppressing the amount of power consumption. The object is to provide a control device and a pump operating method.

In order to achieve the above object, a first characteristic configuration of a pump control device according to the present invention comprises a water tank, a water level gauge for measuring the water level of the water tank, and a pump for adjusting the water level of the water tank. The pump is started when the water level of the water storage tank measured by the water level gauge reaches the starting water level, and the pump is stopped when the water level reaches the stop water level. In the pump control device, a first stop water level and a second stop water level set on the starting water level side with reference to the first stop water level can be set as the stop water level, and the water storage facility is a manhole . When the water storage facility is a distribution reservoir facility, the amount of water inflow into the water tank per predetermined time when the pump is stopped is used as an index, and the water storage facility is a distribution reservoir facility. By setting the stop water level to the second stop water level when the outflow water amount is used as an index and the index is less than a preset threshold value, the stop water level is set to the first stop water level Also, the pump is configured to operate in a region in which the amount of power consumption per unit amount of water supplied is low.

For example, when the amount of water flowing into or out of the water tank per predetermined time when the pump is stopped is greater than a preset threshold value, by setting the first stop water level to the stop water level and driving the pump, frequent If the amount of water flowing into or out of the water tank per predetermined time when the pump is stopped is less than a preset threshold value, the first stop water level is used as a reference. The power consumption can be suppressed by setting the second stop water level set on the water level side to the stop water level, driving the pump, and operating in a region where the power consumption per unit water supply is low.

In addition to the above-described first characteristic configuration, the second characteristic configuration is the rate of increase or decrease of the most recent water level measured by the water level gauge when the pump is stopped, or the rate of increase or decrease from the starting water level to the stopping water level. The index is calculated based on the most recent operating time of the pump up to

Based on the most recent water level rise or fall rate , which is determined based on the water level measured by the water level gauge when the pump is stopped, the amount of water flowing into or out of the water tank per predetermined time can be grasped as an index, and when the starting water level is reached, the pump From the most recent operation time of the pump until reaching the stop water level after the start of the pump, the amount of water flowing out of the water tank per predetermined time can be grasped as an index.

The third characteristic configuration is a water storage facility, either a manhole facility or a distribution reservoir facility , comprising a water tank, a water level gauge for measuring the water level in the water tank, and a pump for adjusting the water level in the water tank. is provided in the pump control device for starting the pump when the water level in the water tank measured by the water level gauge reaches the starting water level, and stopping the pump when the water level reaches the stopping water level, wherein the stopping water level is a first A stopping water level and a second stopping water level set on the starting water level side with reference to the first stopping water level can be set, and the frequency of starting the pump per predetermined time is used as an index, and the index is set in advance. By setting the stop water level to the second stop water level when it is less than the set threshold value, the power consumption per unit water supply amount becomes lower than when the stop water level is set to the first stop water level. The point is that the pump is configured to operate repeatedly in a region.

A pump provided in a water storage facility has a maximum activation frequency for a predetermined period of time. However, there is a margin in the activation frequency except when the amount of water flowing into or out of the water tank is at its maximum. Therefore, when the activation frequency per predetermined time is less than a preset threshold value, it can be understood that the inflow water amount is small. , the power consumption can be suppressed by operating the pump in a region where the power consumption per unit of water supply is low.

The fourth characteristic configuration is that, in addition to any one of the first to third characteristic configurations, the index is calculated in consideration of preset date and time information.

For example, residential areas use more water in the morning and evening, while industrial areas use more water in the daytime. pattern can be seen. If the index is calculated with such a characteristic pattern taken into account, it becomes possible to reduce power consumption in a more realistic manner.

The fifth characteristic configuration is that, in addition to any one of the first to fourth characteristic configurations, the second stop water level is configured to be variably set based on the index.

Power consumption can be reduced more flexibly if the water level of the second stop water level, which is set on the starting water level side with respect to the first stop water level, is not fixed but set variable based on an index. Become.

In the sixth characteristic configuration, in addition to any one of the above-described first to fifth characteristic configurations, the starting water level is a first starting water level and the stopping water level is opposite to the first starting water level based on the first starting water level. A second activation water level set on the side can be set, and when the index is less than a preset threshold value, the activation water level is set to the second activation water level, thereby increasing the activation water level to the second activation water level. The pump is configured to operate repeatedly in a region in which the power consumption per unit water supply is lower than in the case of setting one starting water level.

When the index is less than a preset threshold, by setting the starting water level to the second starting water level on the higher water level side than the first starting water level, the pump in the region where the power consumption per unit water supply is low can be operated, and power consumption can be reduced more effectively.

The seventh characteristic configuration is that, in addition to the sixth characteristic configuration described above, the second starting water level is configured to be variably set based on the index.

Power consumption can be reduced more flexibly if the second starting water level, which is set on the opposite side of the stopping water level based on the first starting water level, is not fixed but set variable based on an index. become.

The eighth characteristic configuration, in addition to any one of the first to seventh characteristic configurations described above, is that the water storage facility is a manhole facility, and the second stop water level is lower than the lower end water level of the effective storage water depth of the manhole facility. is set at a high position.

In manhole facilities, the lower end of the effective reservoir water depth of the manhole is often set as the first stop water level. By setting the second stop water level higher than the lower end of the effective reservoir water depth, Operation with low power consumption is ensured.

In the ninth characteristic configuration, in addition to any one of the first to eighth characteristic configurations described above, the first stop water level is set to the lower end water level of the effective storage water depth of the manhole facility, and the second stop water level is set to the stop water level and/or the pump is operated a predetermined number of times and/or after a predetermined period of time has elapsed, the pump is operated with the first stop water level set to the stop water level at least once. in the point.

When the water tank is a drain tank such as a manhole, organic matter such as kitchen waste and oil mixed in with the inflow floats on the surface of the water and forms a film of scum, which generates a foul odor inside. Even in such a case, the pump has been operated a predetermined number of times and/or the predetermined time has passed while the first stop water level is set to the lower end water level of the effective storage water depth of the manhole facility or less, and the second stop water level is set to the stop water level. Sometimes, when the stop water level is set to the first stop water level and the pump is operated, the scum accumulated in the drain tank is drained by the pump, and the inside of the tank is purified.

The tenth characteristic configuration, in addition to the above-described ninth characteristic configuration, is characterized in that the starting water level and the second stopping water level are set so as to satisfy a preset minimum starting time interval of the pump. be.

If the start-up time interval of the pump is short, the motor of the pump may generate heat due to frequent start-up, which may shorten the life of the pump. However, by properly setting the start water level and the second stop water level, the required minimum start time interval of the pump can be met and the occurrence of the above mentioned disadvantages can be avoided.

The eleventh characteristic structure is, in addition to any one of the first to tenth characteristics, the pump discharges a unit amount of water as the discharge amount per unit time increases within the range of use. It is a pump that exhibits the characteristic that the amount of electric power required for

It is possible to effectively reduce the power consumption of the pump exhibiting such characteristics.

The twelfth characteristic configuration is a water storage tank, a water level gauge for measuring the water level of the water tank, and a pump for adjusting the water level of the water tank. A pump control device provided in equipment for starting the pump when the water level in the water tank measured by the water level gauge reaches the starting water level, and stopping the pump when the water level reaches the stopping water level, wherein the starting water level is A first starting water level and a second starting water level set on the opposite side of the stopping water level with respect to the first starting water level can be set, and the frequency of starting the pump per predetermined time is used as an index, By setting the activation water level to the second activation water level when the index is less than the preset threshold value, power consumption per unit water supply is lower than when the activation water level is set to the first activation water level. The pump is designed to operate repeatedly in the low volume region.

For example , even with a pump such as an axial flow pump whose shaft power increases as it approaches the cut-off operation, power consumption can be effectively reduced.

A first characteristic configuration of the pump operation method according to the present invention is a manhole installation or distribution reservoir installation comprising a water tank, a water level gauge for measuring the water level in the water tank, and a pump for adjusting the water level in the water tank. A pump operation method that is applied to any one of the water storage facilities, starts the pump when the water level in the water tank measured by the water level gauge reaches the start water level, and stops the pump when it reaches the stop water level after that, The stop water level can be set to either a first stop water level or a second stop water level set on the starting water level side with reference to the first stop water level, and when the water storage facility is a manhole facility, A preset threshold for the amount of water flowing into the water tank per predetermined time when the pump is stopped, or the amount of water flowing out of the water tank per predetermined time when the pump is stopped when the water storage facility is a distribution reservoir facility When the stop water level is set to the second stop water level, the power consumption per unit water supply amount is lower than when the stop water level is set to the first stop water level. is to be operated repeatedly.

If the amount of water flowing into or out of the water storage tank per predetermined time period when the pump is stopped is less than a preset threshold value, the pump does not start frequently, so the power consumption per unit of water supply increases. The second stop water level, which is set closer to the starting water level than the first stop water level, can be used as the stop water level, and power consumption can be reduced. As a result, even if the number of start-up times per predetermined time period is higher than when the stop water level is set to the first stop water level, the total power consumption is reduced.

The second characteristic configuration is, in addition to the above-described first characteristic configuration, the second starting water level set on the side opposite to the stopping water level with reference to the first starting water level and the first starting water level. and the starting water level, and when the inflow water amount or the outflow water amount is less than a preset threshold value, the starting water level is set to the second starting water level, so that the starting water level is set to the second starting water level. The point is that the pump is operated repeatedly in a region in which the amount of power consumption per unit water supply is lower than in the case of setting one starting water level.

When the amount of water flowing into or out of the water tank per predetermined time is less than a preset threshold value, the pump does not start frequently. Power consumption per unit water supply is lower when the pump is started at the second starting water level set on the opposite side of the stop water level with respect to . As a result, even if the number of activations per predetermined time period is higher than when the activation water level is set to the first activation water level, the total amount of power consumption is reduced.

In the third characteristic configuration, in addition to the above-described first or second characteristic configuration, the inflow water amount or the outflow water amount is the water level in the water storage tank measured by the water level gauge when the pump is stopped. , the most recent operating time of the pump from the start water level to the stop water level, and the correlation between the preset date and time and the inflow water amount or the outflow water amount. at the point.

The fourth characteristic configuration is applied to a water storage facility comprising a water tank, a water level gauge for measuring the water level in the water tank, and a pump for adjusting the water level in the water tank, and the water level is measured by the water level gauge. A pump operation method for starting the pump when the water level in the water tank reaches the starting water level, and stopping the pump when the water level reaches the stopping water level, wherein the stopping water level is defined as a first stopping water level and the first stopping water level. It can be set to either a second stopping water level set on the starting water level side as a reference, and when the frequency of starting the pump per predetermined time is less than a preset threshold value, the stopping water level is set to the second stopping water level. By setting the stop water level, the pump is operated repeatedly in a region where the power consumption per unit water supply is lower than when the stop water level is set to the first stop water level.

If the frequency of starting the pump per predetermined time is less than a preset threshold value, the amount of water flowing into the water tank per predetermined time is small, so the power consumption per unit water supply is high. First stop The second stop water level, which is set closer to the starting water level than the water level, can be used as the stop water level, and power consumption can be reduced. As a result, even if the number of start-up times per predetermined time period is higher than when the stop water level is set to the first stop water level, the total power consumption is reduced.

The fifth characteristic configuration is, in addition to the above-described fourth characteristic configuration, the second starting water level in which the first starting water level and the first starting water level are set on the opposite side of the stopping water level. or the activation water level, and when the frequency of activation of the pump per predetermined time is less than a preset threshold value, the activation water level is set to the second activation water level, thereby increasing the activation water level. The point is that the pump is operated repeatedly in a region in which the amount of power consumption per unit water supply is lower than in the case of setting the water level to the first starting water level.

When the activation frequency of the pump per predetermined time is less than a preset threshold value, the amount of water flowing into the water tank per predetermined time is small, so the first activation in which the power consumption per unit water supply increases. The second activation water level set on the opposite side of the water level to the stop water level can be used as the activation water level, and power consumption can be reduced. As a result, even if the number of activations per predetermined time period is higher than when the activation water level is set to the first activation water level, the total amount of power consumption is reduced.

As described above, according to the present invention, the capacity of the pump equipment is effectively used to control the start and stop of the pump, thereby effectively suppressing the amount of power consumption. It became possible to provide an apparatus and a method of operating a pump.

Explanatory drawing of a manhole pump device to which the present invention is applied Explanatory diagram of the pump controller Flowchart showing pump operation method Explanatory diagram of simulation results

A manhole pump device to which the pump control device and the pump operating method according to the present invention are applied will be described below.

As shown in FIG. 1, the manhole pump device 10 includes a manhole 11 as a water tank for storing sewage that has flowed in from an inflow pipe 12, and pumps the sewage stored in the manhole 11 to an outflow pipe 14 through a riser pipe 13. and a water level sensor 15 for measuring the water level of sewage stored in the manhole 11 .

A control device 50 for controlling start/stop of the submersible pump 20 is provided near the manhole pump device 10 on the ground.

A power supply line 57 for supplying power to the submersible pump 20 is wired between the control device 50 and the submersible pump 20 , and a water level detection signal line 58 is wired between the control device 50 and the water level sensor 15 .

As the water level sensor 15, an injection pressure type or air bubble type water level sensor is used, which is installed at the bottom of the manhole 11 and configured to continuously detect the water level of the sewage stored in the manhole 11. In addition, a backup float-type water level sensor 16 is installed at an abnormally high water level in case the water level sensor 15 fails, and the water level sensor 15 and the water level sensor 16 are configured to detect an abnormally high water level HHWL. there is A float-type water level sensor may be used as the water level sensor to detect the water level each time a predetermined water level is reached, or another known water level sensor may be used to measure the water level.

As shown in FIG. 2, the control device 50 stores a microcomputer 51 functioning as a control unit (hereinafter also referred to as a "control unit 51") and a control program executed by the microcomputer 51, and also stores a working program. A memory 52 used as an area and a pump drive circuit 53 controlled by a microcomputer 51 are provided.

Further, a communication unit 54 and the like are provided for receiving a monitor signal output from the microcomputer 51 and wirelessly communicating the status of the manhole to an external remote control device 55 .

Specifically, it relates to the start time of the pump grasped by the control unit 51, the number of start times per day, the presence or absence of an abnormally high water level, and an abnormal state such as abnormal heating detected by a sensor provided in the pump. Information, furthermore, the setting information of the pump starting water level and the pump stopping water level shown below, the time information thereof, and the like are transmitted to the remote control device 55 via the communication unit 54 .

The control unit 51 controls the pump driving circuit 53 based on the water level measured by the water level sensor 15 to start and control the electric motor 30 of the submersible pump 20 . For example, when the pump drive circuit 53 is configured by an inverter circuit, the rotation speed of the electric motor 30 is controlled, and when the pump drive circuit 53 is configured by a relay circuit for power supply, the state of power supply to the electric motor 30 is controlled. is controlled.

When the water level sensor 15 detects that the amount of stored water has reached the pump starting water level HWL, the control unit 51 starts the electric motor 30 (hereinafter, also referred to as “starting the submersible pump”) to cause the submersible pump 20 to discharge sewage downstream. When the pump stop water level LWL is measured, the motor motor 30 to stop discharging sewage by the submersible pump 20 .

The control unit 51 sets the stop water level LWL to the starting water level HWL side, that is, the high water level side with reference to the first stop water level LWL1 set at the lower end water level of the effective storage water depth of the manhole facility and the first stop water level LWL1. The second stop water level LWL2 can be set, and either the first stop water level LWL1 or the second stop water level LWL2 is set as the stop water level LWL using the amount of water flowing into or out of the manhole 11 per predetermined time as an index. is configured to

Further, the control unit 51 sets, as the starting water level HWL, the first starting water level HWL1 and the second starting water level HWL2 set on the opposite side of the stopping water level LWL with respect to the first starting water level HWL1, that is, on the high water level side. Either one of the first activation water level HWL1 and the second activation water level HWL2 is set as the activation water level HWL based on the index.

For example, when the amount of water flowing into or out of the manhole 11 per predetermined time is large, the submersible pump 20 is driven by setting the first stop water level LWL1 to the stop water level LWL, thereby avoiding frequent pump activation. When the amount of water flowing into or out of the manhole 11 per predetermined time period is small, the second stop water level LWL2, which is set on the starting water level HWL side with reference to the first stop water level LWL1, is set to the stop water level LWL. to drive the submersible pump 20 . The latter control makes it possible to suppress the power consumption by avoiding operation in a region where the power consumption per unit of water supply is high.

The starting water level HWL can be switched between the first starting water level HWL1 and the second starting water level HWL2 set on the opposite side of the first starting water level HWL1 from the stopping water level LWL. It becomes possible to operate in a region where the amount of power consumption per unit of water supply is low, and it becomes possible to reduce power consumption more effectively. At least, it is sufficient that the stop water level is switchable.

The index for setting the stop water level LWL and the starting water level HWL is the amount of water inflow into the manhole 11 per predetermined time. The first stop water level LWL1 is set to the stop water level LWL, and the first start water level HWL1 is set to the start water level HWL to avoid overflow.

Conversely, when the amount of inflow water per unit of water flow is small, the consumption per unit of water flow should be avoided in order to avoid operation in a region where the lift is large and the water level is low, that is, the region where the power consumption per unit water flow is high. The stop water level LWL is set to the second stop water level LWL2 with the low power amount, and the start water level HWL is set to the second start water level HWL1.

The amount of inflow water per predetermined time can be determined based on the most recent water level rise rate measured by the water level gauge 15 when the submersible pump 20 is stopped. The determination can be made based on the rising speed, and the index may be calculated in consideration of the most recent operation time of the submersible pump 20 .

In the latter case, if the operation time of the submersible pump 20 from the starting water level HWL to the stopping water level LWL is long, it can be determined that the amount of inflow water per predetermined time is large. If the operating time of the submersible pump 20 is short, it can be determined that the amount of inflow water per predetermined time is small.

By monitoring the most recent water level fluctuations or the most recent operating hours of the pump, you can determine the amount of water required by the pump at that time. , it is possible to operate with reduced power consumption while maintaining a predetermined amount of water supply required at that time.

Further, it is preferable to calculate a specific numerical value of the amount of inflow water per predetermined time based on the amount of electric power required for the outflow of a unit amount of water to the manhole 11 and use it as an index. By setting such an index, the pump can be operated in a region in which the amount of electric power required for outflow of a unit amount of water is further reduced.

Furthermore, it may be configured such that the index is calculated in consideration of preset date and time information. For example, in residential areas, water consumption increases in the morning and evening, while in industrial areas, water consumption increases during the day. A characteristic pattern can be seen depending on whether it is a weekend or not. If the index is calculated with such a characteristic pattern taken into account, it becomes possible to reduce power consumption in a more realistic manner.

Since such date and time information differs from area to area, the individual date and time information may be transmitted wirelessly from the remote control device 55 to the communication unit 54 of each manhole pump device 10 and stored in the memory 52 . preferable.

It is preferable that the second stop water level LWL2 and/or the second starting water level HWL2 are configured to be variably settable based on the index, and power consumption can be further reduced by flexibly responding to fluctuations in the amount of inflow water. be possible. For example, when the amount of inflow water per predetermined time is extremely small, the power consumption can be further reduced by setting the second stop water level LWL2 and/or the second starting water level HWL2 higher.

Further, the submersible pump 20 is operated a predetermined number of times and/or a predetermined period of time has elapsed while the first stop water level LWL1 is set to the lower end water level of the effective storage water depth of the manhole facility or less, and the second stop water level LWL2 is set to the stop water level LWL. Then, it is preferable that the submersible pump 20 is operated with the first stop water level LWL1 set to the stop water level LWL at least once.

When the water tank is a drain tank such as the manhole 11, organic matter such as garbage and oil mixed in with the inflow floats on the surface of the water and forms a film of scum, which generates a foul odor inside. Even in such a case, the pump is operated a predetermined number of times in a state in which the first stop water level LWL1 is set to the lower end water level of the effective storage water depth of the manhole facility or lower, and the second stop water level LWL2 above it is set to the stop water level. /or when the pump is operated with the stop water level LWL set to the first stop water level LWL1 after a predetermined time has elapsed, the scum accumulated in the manhole 11 is drained by the submersible pump 20, and the inside of the manhole 11 is purified. be able to

Further, it is preferable that the starting water level HWL and the second stop water level LWL2 are set so as to satisfy a preset minimum starting time interval of the submersible pump 20 .

If the pump start-up time interval is short, power consumption increases due to frequent start-up, heat is generated in the motor of the pump, and there is a risk of shortening the life of the motor, that is, the pump. However, by appropriately setting the starting water level and the second stopping water level, it is possible to meet the preset minimum start-up time interval of the pump, thereby avoiding the occurrence of the aforementioned inconveniences.

As shown in FIG. 4, the pump needs to exhibit characteristics such that the amount of electric power required to discharge a unit amount of water decreases as the discharge amount per unit time increases within the range of use.

Based on the flowchart shown in FIG. 3, the pump operating method executed by the control unit 51 of the pump having characteristics similar to those shown in FIG. 4 will be described.
The control unit 51 reads the index from the memory 52 (S1), and if the value is lower than a preset threshold value, that is, if it determines that the inflow amount per unit time is small (S2), sets the starting water level to HWL2 and stops The water level is set to LWL2 (S3), and when it is determined that the inflow amount per unit time is large (S2), the start water level is set to HWL1 and the stop water level is set to LWL1 (S11).

The starting water level is set to HWL2, and the stopping water level is set to LWL2 (S3). When the water level of the manhole 11 reaches or exceeds the starting water level HWL2 (S4), the pump is started and the pump starting counter is incremented (S5). The value of the pump activation counter is initially set to 0 and incremented by 1 each time it is activated.

When the value of the pump activation counter is less than a preset threshold value N (N=6 in this embodiment) (S6), the pump is driven until the water level drops with reference to the stop water level LWL2 (S8). Then, the submersible pump 20 is driven until the water level drops with reference to the stop water level LWL1, and when the water level drops below the stop water level LWL1 (S7), the value of the pump activation counter is reset to 0 (S9), and after a predetermined time has elapsed, the submersible pump 20 is started. It is stopped (S10).

That is, the pump is stopped when the water level reaches the stop water level LWL2 until the value of the pump start counter reaches N=6, and when the water level reaches the stop water level LWL1 when the value of the pump start counter reaches N=6, the pump is stopped. . As a result, the scum accumulated in the manhole 11 is crushed and pumped downstream together with the sewage.

When the starting water level is set to HWL1 and the stopping water level is set to LWL1 in step S11, when the water level of the manhole 11 becomes equal to or higher than the starting water level HWL1 (S12), the pump is started (S13), and when the water level becomes equal to or lower than the stopping water level LWL1. (S14), and the submersible pump 20 is stopped after a predetermined time has elapsed (S15).

That is, the pump operation method according to the present invention is applied to a water storage facility provided with a water storage tank and a pump for discharging water from the water storage tank or flowing water into the water storage tank, and the water level of the water storage tank is activated. A pump operating method for starting the pump when the water level reaches the stop water level and then stopping the pump when the stop water level is reached. and the second stop water level set on the starting water level side can be set, the second stop water level is set as the stop water level, and the pump is operated with the first stop water level as the stop water level. to meet a predetermined amount of water inflow or outflow to the reservoir per predetermined period of time.

Also, the second stop water level is set based on the most recent water level fluctuation measured by the water level gauge or based on the most recent operating time of the pump.

The water storage facility is a manhole facility, the first stop water level is set at the lower end water level of the effective storage water depth of the manhole facility, and the second stop water level is set at a position higher than the lower end water level of the effective storage water depth of the manhole facility. , when the pump is operated a predetermined number of times and/or after a predetermined period of time has passed while the second stop water level is set to the stop water level, the pump is operated with the first stop water level set to the stop water level at least once. It is

Based on FIG. 4, simulation results of the present invention will be described.
FIG. 4 shows the characteristic lines of the total head, efficiency and shaft power of the manhole pump. The total lift range from 9m to 4m was divided into 5 sections A to E at intervals of 1m. Then, the 1m discharge power amount (power consumption per unit water supply amount) at that time was calculated.

Here, the amount of power discharged for 1 m is the amount of power consumed to discharge water for a height of 1 m, assuming a water tank of the same cross section. Since the water tanks have the same cross-sectional area, the amount of water discharged from the height of 1 m is always the same amount.

For example, when discharging a lift of 10 m, if it is set to operate in sections B and A (lift of 2 m), if sections B and A are operated 5 times, (2.58 + 3.36) × 5 = 29 .7 kWmin=0.495 kWh (100%) of electric energy is required.

If only section B (head 1 m) is operated 10 times, 2.58×10=25.8 kWmin=0.43 kWh (86.9%), and it can be seen that reduction in power consumption can be achieved.

When only section B (lifting height 1 m) is operated 8 times and then section A and B (lifting height 2 m) are operated once, 2.58 × 9 + 3.36 = 26.58 kWmin = 0.443 kWh (89.5%), It is possible to remove scum by operating in sections B and A while achieving low power consumption.

It can be seen from the similar simulation that low power consumption can be achieved for sections E and D as well.

For example, when a lift of 15 m is discharged, if it is set to operate in sections C, B, and A, when sections C, B, and A (lift of 3 m) are operated five times, (2.09 + 2.58 + 3. 36) For × 5 = 40.15 kWmin = 0.669 kWh (100%), when section C (lifting height 1 m) is operated every time, 2.09 × 15 = 31.35 kWmin = 0.523 kWh (78.2%) As a result, it can be seen that reduction in power consumption can be achieved.

To remove scum, if section C (lifting height 1 m) is operated 12 times and sections C, B, and A (lifting height 3 m) are operated once, 2.09 × 13 + 2.58 + 3.36 = 33.11 kWmin = 0.552 kWh (82.5%), and it can be seen that the power consumption can be reduced while the scum can be removed.

It has been clarified that similar results can be obtained by performing similar calculations in the case of driving in other sections, such as sections E, D, and C as well.

Another embodiment will be described below.
In the above-described embodiment, both the stopping water level and the starting water level are switched and set, but at least the stopping water level may be switched and set.

In the above-described embodiment, the case where the water storage facility is a manhole facility has been described, but the present invention can also be applied to a water distribution reservoir (water distribution tank) that supplies clean water. That is, as the stopping water level, the first stopping water level and the second stopping water level set on the starting water level side with reference to the first stopping water level can be set, and the amount of water flowing out of the water tank per predetermined time is used as an index. , any one of the first stop water level and the second stop water level may be set to the stop water level.

When the water demand from the distribution reservoir (distribution tank) per unit time is low, power consumption is reduced by stopping the pumping of water to the distribution reservoir at the second stop water level, which is lower than the first stop water level. can be suppressed.

Similarly, as the starting water level HWL, a first starting water level HWL1 and a second starting water level HWL2, which is set on the opposite side of the stopping water level LWL with respect to the first starting water level HWL1, that is, on the low water level side, can be set. Either one of the first activation water level HWL1 and the second activation water level HWL2 may be set as the activation water level HWL based on the index.

Then, the index may be calculated based on the amount of electric power required for the unit amount of water to flow out of the water tank.

In the above-described embodiment, the amount of water flowing into or out of the water tank per predetermined time period is used as an index, and either one of the first stop water level and the second stop water level is set as the stop water level. As an index for setting , the activation frequency of the pump per predetermined time may be used.

For example, referring to the Manhole Pump Installation Technical Manual, a 7.5 kW pump has a minimum start-up interval of 6 minutes. Assuming that a manhole pump device is provided with two such pumps and that the two pumps are alternately operated, the apparent minimum startup interval for the two pumps is 3 minutes.

In such a manhole pump device, as one method of switching the stop water level to either the first stop water level or the second stop water level, when the start water level is reached, the elapsed time from the previous stop at the stop water level ( An example of the pump activation frequency per predetermined time) may be checked, and the stop water level may be determined based on the elapsed time.

Since the pump design takes into account the maximum inflow into the tank, the minimum activation interval is ensured, so if the inflow water volume is normal, the activation interval will be longer than the minimum activation interval. Therefore, at the initial stage of construction, the 2nd stop water level is adopted as the initial value of the stop water level, and if the time from when the pump is stopped to the start water level is within 3 minutes, the stop water level is switched to the 1st stop water level. , the stop water level may be maintained at the second stop water level for 3 minutes or longer.

When the discharge capacity at the 2nd stop water level (storage capacity from the starting water level to the 2nd stop water level) is about 1/2 of the discharge capacity at the 1st stop water level (storage capacity from the start water level to the 1st stop water level) If the previous stop water level was the 1st stop water level and the time from when the pump was stopped to the start water level was 6 minutes or more, even if the stop water level is set to the 2nd stop water level, the start interval may be 3 minutes or more. Therefore, the stop water level is switched to the second stop water level, and the stop water level is maintained at the first stop water level within 6 minutes.

If one pump fails and only the normal pump is operating, the reference value for the time from when the pump is stopped to reaching the starting water level should be doubled from 6 minutes to 12 minutes. . Also, if the two pumps have different capacities or if there is an imbalance in the operation time due to a failure or the like, the above reference value may be doubled as the time from the previous operation of the pump concerned.

In this way, when the frequency of activation of the pump per predetermined time is low, the power consumption can be suppressed by operating in a region where the power consumption per unit water supply is low.

As another method of switching the stopping water level between the first stopping water level and the second stopping water level based on the pump starting frequency per predetermined time, a method of determining the stopping water level according to the number of starts per unit time is adopted. may

In the pump device according to the above example, since the minimum activation interval is 3 minutes, when the activation frequency in the past 30 minutes reaches 10 times, the stop water level is set to the first stop water level. It may be configured to be set to the stop water level. In this case, considering the possibility that the activation interval is shorter than the minimum activation interval, it is desirable that the activation frequency for switching the stop water level is about half of the above number.

In the above example, the second stop water level and the first stop water level are set to fixed water levels. Although the configuration for switching to the second stop water level has been described, the configuration may be such that the second stop water level is variably set according to the activation frequency.

When the activation frequency falls below the threshold, if the degree is large, the second stop water level is set to the start water level side, and if the degree is small, the second stop water level is set to the first stop water level side. That is, based on the index, the second stop water level may be variably set to the start water level side with respect to the first stop.

In the above example where the elapsed time since stopping at the stop water level is used as the start frequency, if the previous stop water level was the first stop water level and the time from when the pump was stopped to the start water level was 6 minutes or more , the second stop water level may be set closer to the start water level. For example, when the second stop water level is set at a point where the discharge capacity is 1/3 or 1/4, the interval for switching to the second stop water level may be tripled to 9 minutes or quadrupled to 12 minutes.

Depending on the pump activation frequency per predetermined time, it may be difficult to continue operation at a fixed value of the second stop water level. It may be variably set to the start water level side based on, that is, set to the first stop water level side. For example, if the time to reach the starting water level is 6 minutes or less, for example, if it is 4 minutes and 30 seconds, the position where the first stop water level and the second stop water level are 1/2 is set as the new second stop water level. do it. Although the flow rate per unit time varies depending on the water level, it is described here as uniform.

In this way, when the pump is variably set to the second stopping water level starting water level set at that time depending on the starting frequency of the pump per predetermined time, it becomes possible to reduce power consumption more flexibly. Reduction of power consumption can be achieved.

In the above-described embodiment, the present invention has been described as an example of a pump that exhibits the characteristic that the amount of electric power required to discharge a unit amount of water decreases as the amount of discharge per unit time increases within the range of use. , even for a pump such as an axial flow pump whose shaft power increases as it approaches the cutoff operation, select the stop water level and the start water level in the region where the power consumption per unit water flow of the pump is low, and the effective storage capacity Power consumption can be suppressed by setting the number of times of operation greater than the number of times of operation when the pump is operated at the stop water level and the starting water level for discharging or inflowing the water.

The pump control device and the pump operating method described above are merely examples, and needless to say, they can be modified and designed as appropriate within the scope of the effects of the present invention.

10: Manhole pump device 12: Inflow pipe 11: Manhole 13: Rise pipe 14: Outflow pipe 15, 16: Water level sensor 20: Submersible pump 50: Control device 51: Control unit (Microcomputer 52: Memory 53: Pump drive circuit 54 : Communication unit LWL: Stopping water level LWL1: First stopping water level LWL2: Second stopping water level HWL: Starting water level HWL1: First starting water level HWL2: Second starting water level

Claims (17)

Provided in a water storage facility such as a manhole facility or a distribution reservoir facility comprising a water tank, a water level gauge for measuring the water level in the water storage tank, and a pump for adjusting the water level in the water storage tank, wherein the water level gauge A pump control device that starts the pump when the measured water level of the water tank reaches the starting water level, and stops the pump when the measured water level reaches the stop water level,
As the stopping water level, a first stopping water level and a second stopping water level set on the starting water level side with reference to the first stopping water level can be set,
When the water storage facility is a manhole facility, the amount of water flowing into the water tank per predetermined time when the pump is stopped is used as an index, and when the water storage facility is a distribution reservoir facility, the water storage when the pump is stopped. By setting the stop water level to the second stop water level when the outflow water volume per predetermined time from the tank is used as an index and the index is less than a preset threshold value, the stop water level is changed to the first stop water level. A pump control device configured to operate the pump in a region in which power consumption per unit water supply is lower than when set to . The indicator is calculated based on the most recent rate of rise or fall of the water level measured by the water level gauge when the pump is stopped, or the most recent operating time of the pump from the start water level to the stop water level. 2. The pump controller of claim 1, configured to: Provided in a water storage facility such as a manhole facility or a distribution reservoir facility comprising a water tank, a water level gauge for measuring the water level in the water storage tank, and a pump for adjusting the water level in the water storage tank, wherein the water level gauge A pump control device that starts the pump when the measured water level of the water tank reaches the starting water level, and stops the pump when the measured water level reaches the stop water level,
As the stop water level, a first stop water level and a second stop water level set on the starting water level side with reference to the first stop water level can be set,
By setting the stopping water level to the second stopping water level when the starting frequency of the pump per predetermined time is used as an index and the index is less than a preset threshold value, the stopping water level is changed to the first stopping water level. A pump control device configured to repeatedly operate the pump in a region in which power consumption per unit water supply is lower than when set to the water level. 4. The pump control device according to any one of claims 1 to 3, wherein the index is calculated in consideration of preset date and time information. 5. The pump control device according to any one of claims 1 to 4, wherein said second stop water level is variably settable based on said index. As the starting water level, a first starting water level and a second starting water level set on the opposite side of the stopping water level with respect to the first starting water level can be set,
By setting the activation water level to the second activation water level when the index is less than the preset threshold value, power consumption per unit water supply is lower than when the activation water level is set to the first activation water level. 6. A pump controller as claimed in any one of the preceding claims, arranged to repeatedly operate the pump in a low volume region. 7. The pump control device according to claim 6, wherein said second starting water level is variably settable based on said index. 8. The pump according to any one of claims 1 to 7, wherein the water storage facility is a manhole facility, and the second stop water level is set higher than the bottom water level of the effective storage water depth of the manhole facility. Control device. When the pump is operated a predetermined number of times and/or after a predetermined period of time has elapsed, with the first stop water level set to the lower end water level of the effective storage water depth of the manhole installation or less and the second stop water level set to the stop water level, 9. The pump control device according to claim 8, wherein the pump is operated with the first stop water level set to the stop water level at least once. 10. The pump control device according to claim 9, wherein the starting water level and the second stopping water level are set so as to satisfy a preset minimum starting time interval of the pump. 11. The pump control device according to any one of claims 1 to 10, wherein the pump has a characteristic that the amount of electric power required to discharge a unit amount of water decreases as the amount of water discharged per unit time increases. Provided in a water storage facility such as a manhole facility or a distribution reservoir facility comprising a water tank, a water level gauge for measuring the water level in the water storage tank, and a pump for adjusting the water level in the water storage tank, wherein the water level gauge A pump control device that starts the pump when the measured water level of the water tank reaches the starting water level, and stops the pump when the measured water level reaches the stop water level,
As the starting water level, a first starting water level and a second starting water level set on the opposite side of the stopping water level with respect to the first starting water level can be set,
By setting the starting water level to the second starting water level when the starting frequency of the pump per predetermined time is used as an index and the index is less than a preset threshold value, the starting water level is set to the first starting water level. A pump control device configured to repeatedly operate the pump in a region in which power consumption per unit water supply is lower than when set to the water level. Applied to a water storage facility such as a manhole facility or a distribution reservoir facility comprising a water tank, a water level gauge for measuring the water level in the water storage tank, and a pump for adjusting the water level in the water storage tank, and the water level gauge A pump operation method for starting the pump when the measured water level of the water tank reaches the starting water level, and stopping the pump when the measured water level reaches the stopping water level,
The stop water level can be set to either a first stop water level or a second stop water level set on the starting water level side with reference to the first stop water level,
When the water storage facility is a manhole facility, the amount of water flowing into the water storage tank per predetermined time when the pump is stopped, or when the water storage facility is a distribution reservoir facility, a predetermined amount of water for the water storage tank when the pump is stopped By setting the stop water level to the second stop water level when the amount of outflow water per hour is less than the preset threshold value, the stop water level is set to the first stop water level. A pump operation method for repeatedly operating the pump in a region where the amount of power consumption is low. The starting water level can be set to either a first starting water level or a second starting water level set on the opposite side of the stopping water level with respect to the first starting water level,
By setting the starting water level to the second starting water level when the inflow water amount or the outflow water amount is less than a preset threshold value, the unit feed rate is higher than when the starting water level is set to the first starting water level. 14. The method of operating a pump according to claim 13 , wherein the pump is repeatedly operated in a region where power consumption per water volume is low. The inflow water amount or the outflow water amount is the rising speed or falling speed of the water level of the water tank measured by the water level gauge when the pump is stopped, and the speed of the pump from the starting water level to the stopping water level. 15. The pump operation method according to claim 13 or 14 , wherein the pump operation method is obtained based on the most recent operation time, the correlation between a preset date and time, and the amount of inflow water or the amount of outflow water. Applied to a water storage facility comprising a water storage tank, a water level gauge for measuring the water level of the water storage tank, and a pump for adjusting the water level of the water storage tank, and the water level of the water storage tank measured by the water level gauge is activated. A pump operating method for starting the pump when the water level reaches a level and then stopping the pump when the water level reaches a stop,
The stop water level can be set to either a first stop water level or a second stop water level set on the starting water level side with reference to the first stop water level,
By setting the stop water level to the second stop water level when the activation frequency of the pump per predetermined time is less than a preset threshold value, the stop water level is set to the first stop water level. A pump operating method for repeatedly operating the pump in a region where power consumption per unit water supply is low. The starting water level can be set to either a first starting water level or a second starting water level set on the opposite side of the stopping water level with respect to the first starting water level,
By setting the activation water level to the second activation water level when the frequency of activation of the pump per predetermined time is less than a preset threshold value, the activation water level is set to the first activation water level. 17. The method of operating a pump according to claim 16 , wherein the pump is repeatedly operated in a region where power consumption per unit water supply is low.

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