JP5230168B2 - Pump operation control device - Google Patents

Description

  The present invention relates to a pump operation control device for starting and stopping a pump that is disposed in a water storage section such as a water storage tank in which water is stored and that discharges water from the water storage section, depending on the water level of the water storage section. It belongs to the technical field.

  Conventionally, this kind of pump operation control device is well known, and this device detects the water level of the water storage part by a water level sensor or the like, and the water level detected while the pump is stopped is a preset starting water level. When the above is reached, the pump is started, and when the water level detected during operation of the pump is equal to or lower than the stop water level set in advance to a value lower than the starting water level, the pump is It is made to stop (for example, refer patent document 1).

  In the pump operation control device, if the starting water level is set high, when the amount of water flowing into the reservoir increases, the drainage may not be in time and water may overflow from the reservoir. If it is lowered, the difference from the stop water level is small, and the pump is frequently started and stopped, resulting in problems with the durability of the pump.

Therefore, in Patent Document 1, it is proposed that the rising speed of the water level of the water storage unit is obtained, and when the rising speed is large, the starting water level is changed low, and when the rising speed is small, the starting water level is changed high. Has been.
Japanese Patent Laid-Open No. 6-193484

  However, in the conventional pump operation control device that changes the starting water level as described above, it is not easy to determine what value to change the starting water level, and depending on the change value, there is a possibility that drainage may not be in time. . Moreover, it is necessary to compare the changed value with the actual water level, and the start timing of the pump is delayed by that amount, so there is room for improvement.

  The present invention has been made in view of such points, and an object of the present invention is to provide a pump that is disposed in the water storage section and discharges the water in the water storage section. For the pump operation control device that is started when the water level becomes equal to or lower than the stop water level, the pump is not frequently started and stopped by improving the control of the pump. However, even if the amount of water flowing into the water reservoir increases, it is intended to reliably prevent the water from overflowing from the water reservoir.

  In order to achieve the above object, according to the present invention, when the water level rising speed is detected while the pump is stopped and the water level rising speed is equal to or higher than a predetermined speed, the water level of the water storage section is higher than the starting water level. Even if it is low, the pump was started.

  Specifically, in the first aspect of the present invention, a pump that is disposed in a water storage section that stores water, discharges the water in the water storage section, a water level detection means that detects a water level in the water storage section, When the water level detected by the water level detection means during stoppage is equal to or higher than a preset start water level, the pump is started, while the water level detected by the water level detection means during operation of the pump is Further, the present invention is directed to a pump operation control device including control means for stopping the pump when the water level is lower than or equal to a stop water level set in advance to a value lower than the start water level.

And a water level rising speed detecting means for detecting the rising speed of the water level of the water reservoir, wherein the control means is preset with a water level rising speed detected by the water level rising speed detecting means while the pump is stopped. When the speed is equal to or higher than the predetermined speed , the pump is configured to be activated regardless of the detected water level even if the water level detected by the water level detection means is lower than the startup water level. .

  With the above configuration, when the water level rising speed is equal to or higher than a predetermined speed, the pump is activated regardless of the water level of the water storage section, and the water in the water storage section is discharged outside the water storage section. As a result, the start timing of the pump when the water level rising speed is equal to or higher than the predetermined speed becomes irrelevant to the start water level, so that the start water level is somewhat high, that is, the pump is not frequently started and stopped. Such a water level can be set. And even if it is such a high starting water level, if a water level raise speed becomes more than predetermined speed, since a pump will start immediately, it can prevent reliably that a water overflows from a water storage part.

  According to a second aspect of the present invention, there is provided a plurality of the pumps according to the first aspect of the present invention, and the control means is configured to perform the control according to the water level rising speed detected by the water level rising speed detecting means while the pump is stopped. It is assumed that a pump to be activated is determined from among a plurality of pumps and the determined pump is activated.

  As a result, the larger the water level rise speed, the more water can be discharged according to the water level rise speed by starting more pumps or starting pumps with higher discharge rates. The water in the water reservoir can be efficiently discharged out of the water reservoir without operating the pump wastefully.

  According to a third aspect of the invention, in the first aspect of the invention, the water level lowering speed detecting means for detecting the lowering speed of the water level of the water storage section is provided, and the control means is the water level lowering speed detecting means during operation of the pump. When the water level lowering speed detected by the above is lower than a preset reference speed, the pump is not stopped even if the water level detected by the water level detecting means is equal to or lower than the stop water level. Shall.

  In other words, when the water level lowering speed is smaller than the reference speed, water of approximately the same amount as the amount of water discharged by the pump has flowed into the water reservoir, so when the pump is stopped at that time, the water level rises immediately. When the speed becomes equal to or higher than a predetermined speed, the pump is started. Thereby, starting and a stop of a pump are performed frequently, or the water level of a water storage part will rise rapidly during a stop of a pump. However, in the present invention, when the water level lowering speed is smaller than the reference speed, the pump is not stopped, so that it is possible to prevent the pump from being started and stopped frequently and to prevent water from overflowing from the water storage section. This can be prevented more reliably.

  According to a fourth aspect of the present invention, there is provided a plurality of the pumps according to the first aspect of the present invention, and the control means is configured to perform the control according to the water level rising speed detected by the water level rising speed detecting means while the pump is stopped. When a pump to be activated is determined from among a plurality of pumps and the determined pump is activated, and when the water level lowering speed detected by the water level lowering speed detecting means during operation of the pump is smaller than the reference speed In addition, even when the water level detected by the water level detecting means is equal to or lower than the stop water level, at least one of the pumps in operation is not stopped.

  Thus, similarly to the invention of claim 2, the water in the water storage section can be efficiently discharged out of the water storage section without operating the pump wastefully, and, as in the invention of claim 3, While preventing the pump from being frequently started and stopped, it is possible to prevent the water from overflowing more reliably.

As described above, according to the pump operation control apparatus of the present invention, when the water level rising speed of the water storage unit is equal to or higher than the predetermined speed, even if the water level of the water storage unit is lower than the startup water level, regardless of the water level of the water storage unit. As a result of starting the pump, the starting water level is set to a certain level so that the pump does not start and stop frequently, and the amount of water flowing into the water storage section increases. However, it is possible to reliably prevent the water from overflowing from the water reservoir.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a pump operation control apparatus according to Embodiment 1 of the present invention, and this pump operation control apparatus is disposed in a water tank 1 as a water storage section in which water flowing in from an inflow pipe 2 is stored. One submersible pump 5 is provided. The water tank 1 is installed, for example, in a sewage treatment facility. The pump 5 is configured such that when the pump 5 is operated, the water in the water storage tank 1 is sucked through the suction pipe 6 and then discharged out of the water storage tank 1 through the discharge pipe 7. The amount of water discharged by the pump 5 is larger than the maximum value of the amount of water flowing into the water tank 1, and as a result, the water level of the water tank 1 is always lowered by the operation of the pump 5. In addition, as a water storage part, it is not restricted to the form of a tank, For example, the part in which the spring water of a construction site is stored may be sufficient.

  Further, a water level meter 11 as a water level detecting means for detecting the water level of the water tank 1 is disposed in the water tank 1. In addition to the water level, the water level gauge 11 detects fluctuations in the pressure of the gas when supplying gas into the water in the water tank 1 to generate bubbles in order to detect the water level rising speed of the water tank 1 as will be described later. A bubble type that detects the water level based on the water pressure or a water pressure type that detects the water level based on the water pressure is used.

  Information on the water level detected by the water level gauge 11 is input to a controller 12 as control means provided outside the water tank 1, and the controller 12 starts and stops the pump 5 based on the input water level. Is to control. That is, the controller 12 starts and operates the pump 5 when the water level detected by the water level gauge 11 while the pump 5 is stopped becomes equal to or higher than a preset starting water level H1, The pump 5 is stopped when the water level detected by the water level gauge 11 during the operation of the pump 5 becomes equal to or lower than the stop water level H2 set to a value lower than the starting water level H1 in advance.

  The stop water level H2 is higher than the lowest water level at which the pump 5 can suck water from the suction pipe 6, and is close to the bottom surface of the water tank 1. The start water level H1 is Is set to such a level that water is not frequently started and stopped (a water level having a relatively large difference from the stop water level H2).

  In addition, the controller 12 changes the water level, which is a value obtained by subtracting the water level input last time from the water level input this time, while the pump 5 is stopped, as an interval time between both inputs (steps S1 to S4 in the flowchart described later). The rate of rise of the water level of the water tank 1 is obtained by dividing by the (repetition interval time). Thus, the water level gauge 11 and the controller 12 constitute water level rising speed detecting means for detecting the rising speed of the water level in the water tank 1.

  Then, the controller 12 activates the pump 5 even when the water level detected by the water level gauge 11 is lower than the starting water level H1 when the water level rising speed is equal to or higher than the first predetermined speed A set in advance. It has become. That is, when the amount of water flowing into the water tank 1 increases and the pump 5 is started after the water level becomes equal to or higher than the starting water level H1, the water level rises such that the water may overflow from the water tank 1. When the speed is reached, even if the water level is not equal to or higher than the startup water level H1, the pump 5 is immediately started to prevent water from overflowing from the water storage tank 1. In this embodiment, it is rare that the water level rising speed is usually smaller than the first predetermined speed A and equal to or higher than the first predetermined speed A.

  Here, the operation of the pump starting process in the controller 12 will be described based on the flowchart of FIG. The pump activation process starts when the pump 5 is stopped.

  In the first step S1, the water level information is input from the water level gauge 11, and in the next step S2, the water level rising speed is calculated from the water level input this time and the previous time.

  In the next step S3, it is determined whether or not the water level rising speed obtained in step S2 is equal to or higher than the first predetermined speed A. When the determination in step S3 is NO, the process proceeds to step S4, while in step S3. When the determination is YES, the process proceeds to step S5, where the pump 5 is activated, and then the pump activation process is terminated.

  In step S4, it is determined whether or not the water level input from the water level gauge 11 is equal to or higher than the starting water level H1, and when the determination in step S4 is NO, the process returns to step S1 while the determination in step S4 is performed. When the determination is YES, the process proceeds to step S5 to start the pump 5, and then the pump start process is terminated.

  When the water level rising speed of the water storage tank 1 is smaller than the first predetermined speed A by the operation of the pump activation process in the controller 12, the pump 5 is detected when the water level detected by the water level gauge 11 is lower than the activation water level H1. Is in a stopped state. And if the said water level reaches the starting water level H1 in the state where the water level rising speed of the water tank 1 is smaller than the first predetermined speed A, the pump 5 is started. When the pump 5 is started, the water level is lowered, and eventually the pump 5 is stopped by a pump stop process (not shown) in the controller 12 when the water level becomes equal to or lower than the stop water level H2.

  On the other hand, when the pump 5 is stopped, the amount of water flowing into the water tank 1 increases, and the water level rising speed of the water tank 1 exceeds the first predetermined speed A, which is detected by the water level gauge 11. Even if the water level is lower than the activation water level H1, the pump 5 is activated immediately, thereby preventing the water from overflowing from the water tank 1. Then, when the water level detected by the water level gauge 11 during the operation of the pump 5 becomes equal to or lower than the stop water level H2, the pump 5 is stopped by a pump stop process (not shown) in the controller 12. If the water level rising speed is equal to or higher than the first predetermined speed A after the pump 5 is stopped, the pump 5 is started again if the water level rising speed is lower than the first predetermined speed A. The pump 5 remains stopped until the water level reaches the starting water level H1.

  Therefore, in this embodiment, when the water level rising speed of the water tank 1 is equal to or higher than the first predetermined speed A, the pump 5 is started even if the water level of the water tank 1 is lower than the starting water level H1. The start timing of the pump 5 when the water level rising speed is equal to or higher than the first predetermined speed A becomes irrelevant to the start water level, and the start water level H1 is high so that the start and stop of the pump 5 are not frequently performed. The water level can be set. And even if it is such a high starting water level H1, if the water level rising speed is equal to or higher than the first predetermined speed A, the pump 5 is started immediately, so that it is possible to reliably prevent water from overflowing from the water storage tank 1. be able to.

(Embodiment 2)
FIG. 3 shows a second embodiment of the present invention (note that the same parts as those in FIG. 1 are denoted by the same reference numerals and the detailed description thereof is omitted), and a plurality of units (three in this embodiment) are provided in the water tank 1. Is different from the first embodiment in that a pump 5 (5a, 5b, 5c) is provided.

  That is, in the present embodiment, first, second and third pumps 5a, 5b and 5c (also referred to as pump 5 when not distinguished from each other) are disposed in the water tank 1, and these first, second and The start and stop of the third pumps 5a, 5b, 5c are controlled independently from each other by the controller 12. The first pump 5a sucks the water in the water storage tank 1 through the suction pipe 6a and then discharges the water from the water storage tank 1 through the discharge pipe 7a. The second pump 5b Is sucked out through the suction pipe 6b and then discharged out of the water storage tank 1 through the discharge pipe 7b. After the third pump 5c sucks the water in the water storage tank 1 through the suction pipe 6c, The water is discharged out of the water storage tank 1 through the discharge pipe 7c. The amount of water discharged by each pump 5a, 5b, 5c is the same.

  The controller 12 determines the pump 5 to be activated (hereinafter referred to as the activation pump) according to the water level rising speed obtained while the pump 5 is stopped, and activates the determined pump 5.

  Specifically, when the water level rising speed is lower than the second predetermined speed B (greater than the first predetermined speed A), only the first pump 5a is activated, and the water level rising speed is equal to or higher than the second predetermined speed B. When the speed is lower than the third predetermined speed C (greater than the second predetermined speed B), the first and second pumps 5a and 5b are activated, and when the water level rising speed is equal to or higher than the third predetermined speed C, the first The second and third pumps 5a, 5b and 5c are all started. That is, when the water level rising speed is smaller than the second predetermined speed B, the water level of the water storage tank 1 can be lowered only by the operation of the first pump 5a, the water level rising speed is equal to or higher than the second predetermined speed B and the third When the speed is lower than the predetermined speed C, the water level of the water storage tank 1 can be lowered by the operation of the first and second pumps 5a and 5b, and when the water level rising speed is equal to or higher than the third predetermined speed C, the first and first The water level of the water storage tank 1 can be lowered by operating all of the second and third pumps 5a, 5b, 5c.

  And when the water level rising speed of the water tank 1 is smaller than the first predetermined speed A, the controller 12 has the water level rising speed when the water level detected by the water level gauge 11 becomes equal to or higher than the starting water level H1. Since it is smaller than the second predetermined speed B, the starting pump is determined to be the first pump 5a, and the determined first pump 5a is started.

  On the other hand, when the water level rising speed of the water storage tank 1 is equal to or higher than the first predetermined speed A while the pump 5 is stopped, if the water level rising speed is lower than the second predetermined speed B, the first pump is turned on. When the pump 5a is determined and the water level rising speed is equal to or higher than the second predetermined speed B and smaller than the third predetermined speed C, the starter pump is determined to be the first and second pumps 5a and 5b, and the water level rising speed is the third. When the speed is equal to or higher than the predetermined speed C, the starter pumps are determined as the first, second, and third pumps 5a, 5b, and 5c, and the determined pump 5 is started.

  When the water level of the water storage tank 1 becomes equal to or lower than the stop water level H2 during the operation of the pump 5, the pump 5 being operated is stopped by a pump stop process (not shown) in the controller 12.

  Here, the operation of the pump starting process in the controller 12 will be described based on the flowchart of FIG. This pump activation process starts when all the pumps 5 are stopped.

  In the first step S11, the water level information is input from the water level gauge 11, and in the next step S12, the water level rising speed is calculated from the water level input this time and the previous time, and in the next step S13, the water level information is obtained in the above step S12. The starting pump is determined as described above according to the water level rising speed.

  In the next step S14, it is determined whether or not the water level rising speed is equal to or higher than the first predetermined speed A. When the determination in step S14 is NO, the process proceeds to step S15, while the determination in step S14 is performed. When it is YES, it progresses to step S16, the pump 5 determined by said step S13 is started, and this pump starting process is complete | finished after that.

  In step S15, it is determined whether or not the water level input from the water level gauge 11 is equal to or higher than the activation water level H1, and when the determination in step S15 is NO, the process returns to step S11, while the determination in step S15 is performed. If YES, the process proceeds to step S16 to start the pump 5 determined in step S13, and then the pump start process is terminated.

  Therefore, also in this embodiment, when the water level rising speed of the water tank 1 is equal to or higher than the first predetermined speed A, the pump 5 is started even if the water level of the water tank 1 is lower than the starting water level H1. Since it is the same as that of form 1, the starting water level H1 is set to a somewhat high water level so that the pump 5 is not frequently started and stopped, and the amount of water flowing into the water storage tank 1 increases. However, it is possible to reliably prevent the water from overflowing from the water storage tank 1.

  Further, in the present embodiment, a plurality of pumps 5 are arranged in the water tank 1, and the larger the water level rising speed, the more pumps 5 are activated, and the discharge amount suitable for the water level rising speed and Thus, the water in the water storage tank 1 can be efficiently discharged without operating the pump 5 wastefully.

  In the second embodiment, the amount of water discharged by each pump 5 is the same, and the number of starter pumps is changed according to the water level rising speed, but the amount of water discharged by each pump 5 is different from each other, For example, when the water level rising speed is lower than the second predetermined speed B, only the first pump 5a is activated, and when the water level rising speed is equal to or higher than the second predetermined speed B and lower than the third predetermined speed C, the second pump Only 5b may be activated, and only the third pump 5c may be activated when the water level rising speed is equal to or higher than the third predetermined speed C. In short, it is sufficient to obtain a discharge amount suitable for the water level rising speed.

  Further, the number of pumps disposed in the water storage tank is not limited to three, but may be two or four or more.

(Embodiment 3)
In the present embodiment, the hardware configuration of the pump operation control device and the pump activation process in the controller 12 are the same as those in the first embodiment, but the pump stop process in the controller 12 is different from that in the first embodiment.

  Specifically, the controller 12 activates the pump 5 in the same manner as in the first embodiment, and during operation of the pump 5 (in this embodiment, the water level detected by the water level gauge 11 is a predetermined water level H3 (stopped). When the water level descent rate is smaller than a preset reference speed D, the water level descent rate is determined. Even if the water level detected by 11 is equal to or lower than the stop water level H2, the pump 5 during operation is not stopped. The reference speed D is a speed at which it can be considered that approximately the same amount of water discharged from the pump 5 is flowing into the water tank 1, and immediately after the pump 5 is stopped, the water level rises. The speed is such that the speed is equal to or higher than the first predetermined speed A.

  The water level lowering speed is obtained from the change in the water level detected by the water level gauge 11 by the controller 12 in the same manner as the water level rising speed. Therefore, the water level gauge 11 and the controller 12 constitute water level lowering speed detecting means for detecting the lowering speed of the water level in the water tank 1 in addition to the water level rising speed detecting means.

  The operation of the pump stop process in the controller 12 will be described based on the flowchart of FIG. This pump stop process starts when the pump 5 is started.

  In the first step S31, the water level information is input from the water level gauge 11, and in the next step S32, when the input water level reaches the predetermined water level H3, the water level lowering speed is calculated, and this is calculated in the controller 12. Store in memory.

  In the next step S33, the water level information is input from the water level gauge 11, and in the next step S34, it is determined whether or not the input water level is equal to or lower than the stop water level H2. When the determination in step S34 is NO On the other hand, the process returns to step S33, but if the determination in step S34 is YES, the process proceeds to step S35.

  In step S35, it is determined whether or not the water level lowering speed stored in step S32 is smaller than the reference speed D. When the determination in step S35 is NO, the process proceeds to step S36, where the pump 5 is stopped, and then the pump stop process is terminated. On the other hand, when the determination in step S35 is YES, the process proceeds to step S37. The pump operation continuation process is executed, and then the pump stop process is terminated.

  In the pump operation continuation process, for example, the pump 5 is operated for a predetermined time from when the water level input from the water level gauge 11 becomes equal to or lower than the stop water level H2 (when the determination at step S34 is YES). The pump 5 is stopped after the predetermined time has elapsed. The predetermined time may be longer as the water level lowering speed stored in step S32 is smaller, and may be a constant value regardless of the water level lowering speed. Alternatively, the pump 5 is operated until the water level input from the water level gauge 11 reaches the lowest water level at which the pump 5 can suck water from the suction pipe 6, and when the lowest water level is reached, the pump 5 is stopped. You may do it.

  When the water level lowering speed is smaller than the reference speed D, water of approximately the same amount as the amount of water discharged by the pump 5 is flowing into the water tank 1, so that the pump 5 is stopped at that time. Immediately, the water level rising speed becomes equal to or higher than the first predetermined speed A, and the pump 5 is started. As a result, the pump 5 is frequently started and stopped, or the water level of the water tank 1 rises rapidly while the pump 5 is stopped. However, in this embodiment, when the water level lowering speed during operation of the pump 5 (more precisely, the water level lowering speed when the water level detected by the water level gauge 11 becomes the predetermined water level H3) is smaller than the reference speed D. Since the pump 5 is not stopped even when the water level detected by the water level gauge 11 is equal to or lower than the stop water level H2, it is possible to prevent the pump 5 from being frequently started and stopped, and to store water. It is possible to more reliably prevent water from overflowing from the tank 1.

(Embodiment 4)
In this embodiment, the hardware configuration of the pump operation control device and the pump start process in the controller 12 are the same as those in the second embodiment, but the pump stop process in the controller 12 is different from that in the second embodiment. The same pump stop process is performed.

  Specifically, the controller 12 activates the pump 5 determined as the activation pump in the same manner as in the second embodiment, and during operation of the pump 5 (by the water level gauge 11) as in the third embodiment. When the detected water level reaches a predetermined water level H3), the water level descent rate of the water tank 1 is determined. When the water level lowering speed is smaller than the reference speed D, even if the water level detected by the water level gauge 11 is equal to or lower than the stop water level H2, at least one of the pumps 5 in operation is not stopped. To. In the present embodiment, the pump operation continuation process similar to that of the third embodiment is performed for the predetermined pump 5 in operation, and the other pumps 5 are stopped. The predetermined pump 5 is, for example, the first pump 5a during the operation of only the first pump 5a, and the second pump 5b during the operation of the first and second pumps 5a and 5b. During the operation of the second and third pumps 5a, 5b, 5c, the second and third pumps 5b, 5c.

  The operation of the pump stop process in the controller 12 will be described based on the flowchart of FIG. The pump stop process starts when at least one pump 5 is activated.

  In steps S51 to S55, the same processing as that in steps S31 to S35 in the flowchart of the third embodiment (see FIG. 5) is performed, and the determination in step S55 (the water level lowering speed stored in step S52 is smaller than the reference speed D). If NO in step S56, the process proceeds to step S56 to stop all pumps 5 in operation, and then the pump stop process is terminated. On the other hand, if the determination in step S55 is YES, step S56 is performed. Proceeding to S57, the pump operation continuation process for the predetermined pump 5 is executed, the other pumps 5 are stopped, and then the pump stop process is terminated.

  Therefore, in this embodiment, when there are a plurality of pumps 5, the water level lowering speed during operation of the pump 5 (the water level lowering speed when the water level detected by the water level gauge 11 becomes the predetermined water level H3) is the reference speed. When it is smaller than D, even if the water level detected by the water level gauge 11 is equal to or lower than the stop water level H2, the predetermined pump 5 during operation is not stopped. It is possible to prevent the start and stop from being frequently performed, and it is possible to more reliably prevent the water from overflowing from the water storage tank 1.

  INDUSTRIAL APPLICABILITY The present invention is useful for a pump operation control device that starts and stops a pump that is disposed in a water storage unit that stores water and discharges the water in the water storage unit according to the water level of the water storage unit.

It is the schematic which shows the pump operation control apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation | movement of the pump starting process in a controller. FIG. 3 is a view corresponding to FIG. 6 is a flowchart illustrating an operation of a pump activation process in the second embodiment. 10 is a flowchart illustrating an operation of a pump stop process in the third embodiment. 10 is a flowchart illustrating an operation of a pump stop process in the fourth embodiment.

1 Water tank (water storage part)
5 Submersible pump 11 Water level gauge (water level detection means) (water level rising speed detection means)
(Water level descent speed detection means)
12 Controller (Control means) (Water level rising speed detection means)
(Water level descent speed detection means)

Claims (4)

A pump that is disposed in a water storage unit that stores water, discharges water from the water storage unit, a water level detection unit that detects a water level of the water storage unit, and a water level detected by the water level detection unit while the pump is stopped However, the water level detected by the water level detecting means during operation of the pump is set to a value lower than the starting water level in advance. A pump operation control device comprising a control means for stopping the pump when the water level is below the stop water level,
Water level rising speed detecting means for detecting the rising speed of the water level of the water reservoir,
When the water level rising speed detected by the water level rising speed detecting means is equal to or higher than a preset predetermined speed while the pump is stopped, the control means determines that the water level detected by the water level detecting means is the starting water level. The pump operation control apparatus is configured to start the pump regardless of the detected water level even if the pump is lower than the lower limit . The pump operation control device according to claim 1,
There are multiple pumps,
The control means determines a pump to be activated from among the plurality of pumps according to the water level rise speed detected by the water level rise speed detection means while the pump is stopped, and activates the determined pump. It is comprised as follows. The pump operation control apparatus characterized by the above-mentioned. The pump operation control device according to claim 1,
Water level descent speed detecting means for detecting the descent speed of the water level of the water reservoir,
The control means is configured such that when the water level lowering speed detected by the water level lowering speed detecting means during operation of the pump is smaller than a preset reference speed, the water level detected by the water level detecting means is the stop water level. The pump operation control device is configured so as not to stop the pump even if it is below. In the pump operation control device according to claim 3,
There are multiple pumps,
The control means determines a pump to be activated from among the plurality of pumps according to the water level rise speed detected by the water level rise speed detection means while the pump is stopped, and activates the determined pump. In addition, when the water level lowering speed detected by the water level lowering speed detecting means during operation of the pump is smaller than the reference speed, the water level detected by the water level detecting means is less than or equal to the stop water level. A pump operation control device configured to not stop at least one of the pumps in operation.

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