JPH10153462A - Manhole inflow amount detecting method, and device utilizing the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole inflow amount detecting method and a device utilizing the method, by which the inflow amount per unit time to the manhole can be detected only by installing a level sensor and a simple computing means. SOLUTION: In this manhole inflow amount detecting method for detecting the inflow amount of the liquid flown into a manhole 10, the first level sensor 15 is installed for detecting that the liquid level in the manhole 10 reaches the predetermined first level L1 , and the second level sensor 16 is installed for detecting the second level L2 of a position higher than the first level sensor 15 by a specific amount. And, the manhole inflow amount Qi per unit time is detected by operating a formula Qi=V/(t1 -t2 ) where V is the volume of the manhole between the first level sensor 15 and the second level sensor 16, t1 is the time when the liquid level of the first level L1 is detected by the first level sensor 15, and t2 is the time when the liquid level of the second level L2 is detected by the second level sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole inflow detecting method and a manhole inflow detecting method capable of detecting the inflow of liquid such as sewage or the like flowing into a manhole by a simple level sensor for detecting the liquid level and arithmetic means. The present invention relates to an apparatus using the same.

[0002]

2. Description of the Related Art In some cases, it is not possible to transfer sewage discharged from households, factories and the like to a sewage main pipe or a sewage treatment plant only by natural flow. In this case, a manhole provided with a pump is provided. Sewage is collected inside, pumped by a pump, and sent to the sewage main line and sewage treatment plant. When pumping sewage from a manhole in this way, to control the operation of the pump, detect pump blockage, airlock, and detect abnormal inflow of sewage into the manhole, and to issue an alarm, etc., the inflow of sewage into the manhole is required. You need to know the amount.

[0003] As a method of knowing the inflow of manholes,
There is a method of predicting the amount of sewage flowing into a manhole in advance at the stage of designing a manhole device having such a pump, or a method of providing a flow meter and detecting the amount of sewage actually flowing into the manhole.

[0004]

However, the method of predicting the amount of inflow of sewage in the above-mentioned design stage has a problem when the designed inflow amount of sewage and the inflow amount actually flowing in are different.
In addition, the method of providing a flowmeter has a problem that if an expensive flowmeter is provided in such a small-scale manhole device, the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and eliminates the above-mentioned problems. The manhole inflow which can detect the amount of inflow into the manhole per unit time only by providing a level sensor and simple arithmetic means is provided. It is an object of the present invention to provide a method for detecting an amount and an apparatus using the method.

[0006]

According to a first aspect of the present invention, there is provided a method for detecting an inflow amount of a liquid flowing into a manhole, the method comprising detecting a liquid level in the manhole. Is provided with a first level sensor for detecting that has reached a predetermined first level.
A second level sensor for detecting a second level at a position higher than the level sensor by a predetermined amount is provided, a volume of a manhole between the first level sensor and the second level sensor is set to V, and the first level sensor is a first level liquid. The time when the liquid level is detected is defined as t ₁ , the time when the second level sensor detects the liquid level of the second level is defined as t ₂ , and the following equation is calculated to detect the manhole inflow amount Qi per unit time. And Qi = V / (t ₂ −t ₁ )

[0007] The invention described in claim 2 is the first invention.
The manhole inflow detection method manhole inflow per unit last detected time and Qi _n-1 according to the manhole inflow per current unit time is Qi _n, manhole inflow per unit time from the following formula It is characterized in that the quantity Qi is detected. _{Qi = (K 1 × Qi n} -1 + K 2 × Qi n) where K _1, K ₂ are weighting constants, the fractional as a K ₁ + K ₂ = ₁

According to a third aspect of the present invention, a pump is installed in a manhole, and when the liquid level in the manhole reaches the pump operation level, the pump is operated, and the liquid level in the manhole becomes the pump operation level. A pump discharge amount detection device of a manhole device configured to stop the operation of the pump when a pump stop level lower than a predetermined amount is reached, wherein the volume of the manhole between the pump operation level and the pump stop level is determined. V, the manhole inflow amount per unit time is Qi, and the pump operation time is t, and the pump discharge amount V _PO from pump operation to stop is calculated from the following equation. V _PO = V + Qi × t

[0009] The invention described in claim 4 is the invention according to claim 3.
3. The manhole inflow according to claim 2, wherein the pump stoppage level is the first level and the pump operation level is the second level, and the manhole inflow Qi per unit time is detected. It is characterized by comprising means for using an amount detection method.

According to a fifth aspect of the present invention, a pump is installed in a manhole, the pump is operated when the liquid level in the manhole reaches a pump operation level, the liquid in the manhole is discharged, and the liquid level is changed. A pump suction blockage detection device for a manhole device configured to stop the operation of a pump when a pump stop level that is a predetermined amount lower than an operation level is detected, and detects an inflow amount of liquid flowing into the manhole per unit time. an inflow amount detecting means for the inflow amount detected by the inflow amount detecting means and Qi, from the start means for calculating a pump estimated operating time t _X from the following equation, the pump operation reaches the liquid level within the pump operating level a pump operating time measuring means for measuring a pump actual operating time t _P of the pump the expected operation time t _X and pump actual operating time t _P compares the pump actual operating time t _P is the pump Characterized by comprising a pump closure determining means for determining a suction pump Once the estimated operating time t _X exceeds a predetermined time occlusion. _{t X = V / (Q P} -Qi) However, Q _P> Qi, V is manhole volume, Q _P between the pump stop level and the pump operation level discharges minimum rated pumping rate

The invention described in claim 6 is the same as the invention in claim 5
A pump suction blockage detecting device for a manhole device according to claim 1, wherein the inflow amount detecting means is means for detecting a manhole inflow amount using the manhole inflow amount detecting method according to any one of claims 1 and 2. And

According to a seventh aspect of the present invention, a pump is installed in a manhole, the pump is operated when the liquid level in the manhole reaches a pump operation level, the liquid in the manhole is discharged, and the liquid level is set in the pump. A pump airlock detection device of a manhole device configured to stop the operation of a pump when a pump stop level that is a predetermined amount lower than an operation level is reached, and detects an inflow amount of liquid flowing into the manhole per unit time. an inflow amount detecting means for the inflow amount detected by the inflow amount detecting means and Qi, from the start means for calculating a pump estimated operating time t _X from the following equation, the pump operation reaches the liquid level within the pump operating level Pump actual operation time t
Pump operating time measuring means for measuring _P , and pump air lock determining means for determining a pump air lock when the liquid level does not fall below the pump operating level even if the actual pump operating time t _P exceeds the expected pump operating time t _X. It is characterized by having. _{t X = V / (Q P} -Qi) However, Q _P> Qi, V is manhole volume, Q _P between the pump stop level and the pump operation level discharges minimum rated pumping rate

[0013] The invention described in claim 8 is the invention according to claim 7.
In the pump airlock detection device for a manhole device described in (5), the inflow amount detection means is means for detecting the amount of manhole inflow using the manhole inflow amount detection method according to claim 1 or 2.

According to a ninth aspect of the present invention, a pump is installed in a manhole, and when the liquid level in the manhole reaches a pump operation level, the pump is operated to discharge the liquid in the manhole and to discharge the liquid in the manhole. An abnormal inflow detection device for a manhole device configured to stop the operation of the pump when the position reaches a pump stop level lower by a predetermined amount than the pump operation level. Inflow rate detection means for detecting the inflow rate, and the inflow rate detected by the inflow rate detection means exceeds a design maximum inflow rate of the manhole, and the level of the manhole reaches an alarm level set higher than the pump operation level. In this case, there is provided an abnormal inflow amount determining means for determining that the inflow amount is abnormal.

According to a tenth aspect of the present invention, in the apparatus for detecting an abnormal inflow amount of a manhole device according to the ninth aspect, the inflow amount detecting means uses the manhole inflow amount detection method according to the first or second aspect. Means for detecting the amount of inflow of manholes.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of a manhole device that implements the manhole inflow detection method of the present invention. In the figure, reference numeral 10 denotes a manhole, in which a drain pump 11 (No. 1 pump) and a pump 12 (No. 2 pump) are installed. Reference numeral 13 denotes an inflow pipe into which sewage flows, the tip of which is a manhole 1.
It opens inside 0. A discharge pipe 14 for discharging sewage has one end connected to the discharge ports of the pumps 11 and 12.

The manhole 10 is provided with level sensors 15 to 18 for detecting the level of sewage accumulated in the inside thereof. The first level sensor 15 is a level sensor for detecting that the level of sewage reaches the level L ₁ . level sensor second level sensor 16 which detects that the sewage water level reaches a level L _2, level sensor third level sensor 17 for detecting that the sewage water level reaches the level L _3, the fourth level sensor 18 is a level sensor for detecting that the sewage water level reaches the level L _4. Here, L ₁ is a pump stop level, L ₂ is one th pump operation start level, L ₃
The second unit of the pump operation start level, L ₄ is a warning level, which is set as _{L 1 <L 2 <L 3} <L 4.

The outputs of the level sensors 15 to 18 are output to a computing device 19, which computes the amount of sewage inflowing into the manhole 10 from the outputs of the level sensors 15 to 18 by a process described later in detail. Detects the amount of sewage discharge, pump blockage, pump air lock, etc., and outputs it to the control device 20. The control device 20 receives the output of the arithmetic device 19, and operates / stops the No. 1 pump 11 and the No. 2 pump 12, notifies the outside, issues an alarm, and the like.

In the manhole device having the above structure, the wastewater is usually
Water level rises and level L_TwoThe first pump No.1
The 11 or 2 pump 12 is operated. This allows inflow
If the amount of sewage discharged is greater than the amount of sewage
The sewage water level drops to level L ₁No. 1 pump 1
The first or second pump 12 is stopped. In addition, the first one
It is discharged even if the pump 11 or the No. 2 pump 12 is operated.
When the amount of sewage flowing in is greater than the amount of sewage, the sewage level rises
And the sewage water level is level L_ThreeWhen it comes to the second unit No. 2
The pump 12 or the first pump 11 also operates. This causes
Water level drops, water level is level L₁When it comes to the first pong
The pumps 11 and 2 are stopped.

Further, if you are scum measures, without sewage water level stops immediately pump even when the level L _1, continues to operate for a certain time (e.g., set by the timer) pumps, water level to stop after becoming the L _0.
In addition, the operation modes of the pumps include single operation of the first pump 11 or the second pump 12, parallel alternate operation, and emergency two-unit operation.

[Method of Detecting Sewage Inflow] Manhole 10
The amount of sewage inflow per unit time is detected by the following method. By setting the level L ₁ and level L ₂ the manhole 10, the volume of the manhole 10 is because it is known, the volume of the manhole 10 between the level L ₁ and L ₂ can be easily calculated. For example, if the cross-sectional area of the manhole 10 is A _M (m ² ), the volume V ₁ (m ³ ) is V ₁ =
A _M × (L ₂ −L ₁ ) (m ³ ).

With the first pump 11 and the second pump 12 stopped, the sewage water level rises from the level L ₀ and the time when the _first level sensor 15 detects the level L ₁ is t _1. Assuming that the time when the sewage water level rises and the second level sensor 16 detects the level L ₂ is t ₂ , the sewage inflow amount Qi (m ³ / sec) flowing into the manhole 10 per unit time is Qi _{1 = V 1 / (t 2} -t 1) to become.

The capacity V ₁ is stored in advance in the arithmetic unit 19, and the arithmetic unit 19 receives the output of the second level sensor 16 at time t ₁ when the output of the first level sensor 15 is received. from the time t ₂ when the calculated sewage inflow Qi ₁ per the unit time (m ³ / sec).

As shown in FIG. 2, the sewage water level is at level L _2.
(Time t ₂ ), the first pump 11 is operated,
When the sewage water level drops and reaches the level L ₁ (time t ₃ ), the first pump 11 is stopped, and the time when the sewage water level rises and reaches the level L ₂ again is t ₄ , the second time (time t 3) Sewage inflow Qi ₂ (m ³ / se) per unit time from ₃ to t ₄ )
c) is calculated from the following equation. Qi ₂ = V ₁ / (t ₄ -t ₃ )

Here, the previous wastewater inflow amount Qi ₁ (m ³ / se)
c) and the average value Qi of the current wastewater inflow Qi ₂ (m ³ / sec)
By obtaining (m ³ / sec) as Qi = (Qi ₁ + Qi ₂ ) / 2, it is possible to obtain a highly accurate amount of wastewater inflow. The N-1th inflow of sewage is Qi _N-1 (m ³ / sec), and the Nth inflow of sewage is Q
i _N (m ³ / sec), the average value Qi (m ³ / se)
By determining c) as Qi = (Qi _N-1 + Qi _N ) / 2, it is possible to similarly detect the amount of inflow of sewage with high accuracy.

In the above example, the average of the sewage inflow amounts detected at the (N-1) th and Nth times is taken, but the weighting can be calculated as in the following equation. (K ₁ × Qi _N−1 + K ₂ × Qi _N ) For example, K ₁ = 0.3, K ₂ = 0.7, etc., provided that K ₁ + K ₂ =
1

As shown in FIG. 3, the wastewater inflow Qi (m ³ / s
When ec) changes, the above weighting is performed when the average of the previous (N-1st) wastewater inflow Qi _N-1 and the current (Nth) wastewater inflow Qi _N is taken. Here, during operation of the pump (Δt ₃ = t ₃ −t ₂ between time t ₂ and time t ₃ )
When the wastewater inflow amount Qi (m ³ / sec) changes like a, b, and c, the weighting constants K ₁ and K ₂ are automatically calculated.

The automatic calculation method is based on the estimated pump operation time t.
_{X = V 1 / (Q P} -Qi) sewage inflow during the pump stops also calculated when even Qi _N when Qi _N-1. Here stop expected time when the sewage inflow Qi _N-1 t _X1, sewage inflow Qi _N stop expected time t _X2, when the measured value of the pump operation and Delta] t _3, the weighting constants K _1, K ₂ FIG. Under the conditions a, b, and c of ₃ , t _x1 > Δt ₃ > t _x2 . K ₁ and K ₂ are determined by the ratio of t _X1 , Δt ₃ , t _X1 , Qi _N-1 , Qi _N , and Q _P as follows: K ₁ = 1 / (1 + C) K ₂ = 1−K ₁ where C is C = ｛ (Q _P −Qi _N−1 ) · (t _X1 −Δt ₃ )｝ / ｛(Q _P
−Qi _N ) · (Δt ₃ −t _X2 )}. Also, t _X1 <Δt ₃ <t _X2
The same calculation can be performed even when

FIG. 4 is a diagram showing a flow of a process for calculating the amount of inflow of sewage. First and No.1 pump 11 in sewage water level L ₁ is determined whether being stopped (Step ST
1) If yes, the time t _N is set (step ST2). Then, the sewage water level is level L ₂ and 1
It is determined whether or not the signal pump 11 has been operated (step ST
3) If yes, the time t _{N + 1} is set (step ST4). Subsequently, the time difference Δt _N = (t _{N + 1} −t
Calculates the _N) (step ST5), sewage inflow from volume) of the manhole 10 between the result of the calculation as V ₁ stored in advance (level L ₁ and level ^{_{L 2 Qi N (m 3 /}} sec) Is calculated by the following equation (step ST6). Qi _N = V ₁ / Δt _N

[0030] and pump sewage water level L ₁ is judged whether it is stopped (step ST7), and sets the time t _{N + 2} at that time if there at YES (step ST8). Subsequently, the pump operation time Δt _{N + 1} = (t _{N + 2} −t
_{N + 1} ) is calculated (step ST9). Here, when two pumps, the first pump 11 and the second pump 12, are operated, the pump operation time Δt _{N + 1} is changed from the operation of the first pump (for example, the first pump 11) to the second pump (for example, This is the time until the second pump 12) is operated and the two first pumps 11 and the second pump 12 are stopped.

Subsequently, it is determined whether or not to calculate the sewage inflow amount with high accuracy (step ST10). If yes, it is determined whether or not the sewage inflow amount Qi _N-1 (m ³ / sec) has been collected. Is determined (step ST11), and if NO, the wastewater inflow amount Qi _N-1 (m ³ / sec) at that time is set (step ST12). Subsequently, steps ST1 to ST
6 and the current wastewater inflow Qi _N (m ³ / sec)
Is calculated.

[0032] After completing the collection of sewage inflow ^{_{Qi N (m 3 / sec)}} , the last of the sewage inflow Qi _N-1 of the (m ³ / sec) and the current of the sewage inflow Qi _N (m ³ / sec) Average value Qi (m ³ / se
c), i.e., Qi = (calculates _{Qi N-1 + Qi N)} / 2, to obtain a sewage inflow of high precision (step ST
13).

Sewage inflow V _P during operation of No. 1 pump 11
i (m ³ ) is calculated from the wastewater inflow amount Qi (m ³ / sec) and the pump operation time Δt _{N + 1} by calculating the following equation (step S:
T14). _{V P i = Qi × Δt N} + 1

Total sewage inflow V into manhole
_T i (m ³⁾ is calculated by the following formula (Step ST15). Here _{V T i = V P i +} V 1, V 1 is the volume of the manhole 10 between the same levels L ₁ and level L _2.

[Method of Detecting Pump Discharge Amount] FIG. 5 is a flowchart showing a pump discharge amount calculation processing flow. The pump discharge amount V _PO (m ³ ) is calculated from the following equation (step ST2)
1). _{V PO = V T i + V} S1 -V B where, V _S1 is the volume {manhole 1 manhole 10 between the scum measures operating capacity, i.e. the level L ₀ and level L ₁
0 of cross-sectional area _{A M × (L 1 -L 0} ) (m 3)}, V B is the return water of the discharge pipe 14 (m ^3).

Next, the number of operating pumps is checked (step ST22). If one of the first pump 11 or the second pump 12 is operating, the discharge amount V _PO1 or V _{PO2 is changed} to V _PO1 (or V _PO2). ) = V _PO (step ST23), and if the number of operating pumps is two, the discharge amount of each pump, that is, the discharge amount V _PO1 (m ³ ) of the first pump 11, the discharge of the second pump 12 Work volume V
_PO2 (m ³⁾ is calculated from the following equation (step ST24). Of _{V PO1 = {t ON1 / (} t ON1 + t ON2)} × V PO × k 3 V PO2 = {t ON2 / (t ON1 + t ON2)} × V PO × k 4 where t _ON1 the No.1 pump 11 The operation time, t _ON2, is the operation time of the No. 2 pump 12, and k ₃ and k ₄ are coefficient values when the rated discharge capacities of the pumps are the same and 1.0 when the rated discharge capacities are different from each other.

[Detection of pump suction blockage / air lock]
The detection of the pump suction blockage is performed as follows. The minimum rated discharge amount of the pump is set as Q _P (m ³ / sec) at the above-mentioned sewage inflow amount Qi (m ³ / sec). Pumps sewage water level is in the level L _2, operating the No. 1 pump 11 at this minimum rated discharge amount ^{_{Q P (m 3 / sec)}} , the pump is stopped sewage level manholes 10 becomes the level L ₁ Assuming that the expected operation time is t _X (sec), the following equation is satisfied unless there is a pump suction blockage or an air lock. _{t X × Q P = V 1} + Qi × t X t X = V 1 / (Q P -Qi) However, Q _P> Qi

Therefore, by comparing the actual operating time t _P of the pump with the expected pump operating time t _X , it can be determined whether or not the pump is blocked. That is, if T ₁ = k × t _X <t _P , it is determined that the pump is closed. Here, k is a constant and is set to, for example, 1.5 in anticipation of safety. That is, if the actual pump operation time is 1.5 times or more longer than the expected pump operation time, it is determined that the pump suction is blocked. In addition, as described above, the minimum rated discharge rate Q _P of the first pump 11 is Q _P (m ³ / sec).
In be operated, without the sewage water level lowers, if not fall below the operating level L ₃ is airlock is determined to have occurred in No. 1 pump 11.

FIG. 6 is a diagram showing a processing flow of the above-described pump suction blockage / air lock detection. First, the pump is operated (step ST31). Subsequently, the expected pump operation time t _X (sec) is calculated, and the time T ₁ = k × t _X for determining the pump blockage is calculated (step ST3).
2). Next, measurement of the actual operation time t _P of the first pump 11 is started (step ST33).

Subsequently, the pump blockage determination time T ₁ is compared with the actual pump operation time t _P (step ST 34). If the actual operation time t _P is smaller than the time T ₁ (t _P ≦ T ₁ ), T
₁ and t _P 1 No. pump when it is t _P> T ₁ continues the comparison of 1
1 is stopped (step ST).
35). Here the No. 1 pump 11 is normal if the stop (step ST36), whether further sewage water level when it is in operation is the operation level L ₂ or more, i.e., the level sensor 16 is operating It is determined whether or not it is not (step ST37). If yes, an airlock warning is output (step ST38). If no, a pump suction blockage warning is output (step ST39).

[Detection of abnormal inflow amount] When the inflow amount of sewage flowing into the manhole 10 is abnormally large, an abnormal inflow amount warning is issued, and the abnormality in the inflow amount of sewage is determined by the above method. The designed maximum flow rate Q _M i _D (m ³ / s) of the sewage flowing into the manhole 10 when the inflow amount Qi (m ³ / sec)
ec) and the level sensor 18 detects the alarm level L
_It is determined that an abnormal inflow has occurred by detecting ₄ .

FIG. 7 is a diagram showing a processing flow for detecting an abnormal inflow amount. First, the inflow amount Qi (m ³ / sec) of sewage flowing into the manhole 10 is calculated by the inflow amount detection method (step ST41). Next, it is determined whether the operation mode of the pump is two-unit operation or single-alternate operation (step ST42). In the case of two-unit operation, the wastewater inflow Qi (m ³ / sec) actually flowing into the manhole 10 is designed. Maximum inflow Q _M i _D (m ³ / s
ec) is determined (step ST43).
If it is larger, it is determined whether or not two pumps are operated (step ST44).
Determines whether detects the abnormal level L ₄ (step ST47), if you are detecting abnormal level L ₄ emits an abnormal inflow warning (step ST48).

In the step ST42, when the pump is operated alternately, the sewage inflow Qi (m ³ / sec) actually flowing into the manhole 10 is equal to the design maximum inflow Q
_It is determined whether it is larger than _M i _D (m ³ / sec) (step ST45). If it is larger, it is further determined whether one pump is operating (step ST46). 18 emits an abnormal inflow warning on the condition that has detected the abnormal level L _4.

In the current system, whether the alarm of the abnormally high water level is due to a failure of a water level meter (flow switch or the like), the alarm of the abnormally high water level due to a blockage of a pump, or the like, or the abnormally high water level due to an increase in the amount of inflow of wastewater. There was an inconvenience that it was not possible to judge whether this was an alarm. In the present embodiment, this determination is made possible by providing a function for issuing the above-mentioned abnormal inflow amount warning.

The sewage inflow actually flows into the manhole 10 Qi (m ³ / sec) is designed maximum flow rate ^{_{Q M i D (m 3 /}} se
c) determining whether larger or not, Qi> Q _M i after pump operation under the condition that _D, in the case of level sensor 16 (two pumps operating to detect the level L ₂ for detecting the level L ₃ level when the sensor 17) has elapsed a predetermined time not to OFF, failure level sensor 18 for detecting an abnormal level L ₄ can be judged to have occurred.

In the above-described embodiment, the manhole into which sewage flows is described as an example. However, the present invention is not limited to the manhole for sewage, but is naturally applicable to a manhole into which various liquids flow. .

[0047]

As described above, according to the present invention, the following excellent effects can be obtained. (1) According to the first or second aspect of the present invention, the amount of liquid flowing into the manhole per unit time can be detected without providing a special flow meter by a simple level sensor and calculation, and , Management of the pump discharge amount, and prediction of failure of the pump and the system.

(2) According to the third or fourth aspect of the present invention, the pump discharge amount from one pump operation to one stop can be detected by a simple level sensor and calculation without providing a special flow meter. it can.

(3) According to the fifth or sixth aspect of the present invention, a pump suction blockage can be detected with a simple configuration, and a prompt blockage warning can be issued.

(4) According to the invention described in claim 7 or 8, the pump airlock can be detected with a simple configuration, and a quick airlock warning can be issued.

(5) According to the ninth or tenth aspect of the present invention, the abnormal inflow into the manhole can be detected with a simple configuration, and whether the alarm of the abnormally high water level is caused by the failure of the level sensor, the blockage of the pump, etc. It is possible to determine whether the alarm is an abnormally high water level alarm or an abnormally high water level alarm due to an increase in the amount of sewage inflow.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a manhole device that implements a method for detecting a manhole inflow amount according to the present invention.

FIG. 2 is a view showing a change state of a sewage water level of a manhole.

FIG. 3 is a diagram showing an example of the relationship between the amount of inflow of sewage into a manhole and pump stop / operation.

FIG. 4 is a diagram showing a flow of sewage inflow amount calculation processing of the present invention.

FIG. 5 is a diagram showing a pump discharge amount calculation processing flow of the present invention.

FIG. 6 is a diagram showing a pump suction blockage / air lock detection processing flow of the present invention.

FIG. 7 is a diagram showing an abnormal inflow amount detection processing flow of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manhole 11 1st pump 12 2nd pump 13 Inflow pipe 14 Discharge pipe 15-18 Level sensor 19 Computing device 20 Control device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Morikawa 11-1 Haneda Asahimachi, Ota-ku, Tokyo Ebara Corporation (72) Inventor Shoichi Yonemura 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture Kubota Co., Ltd. (72) Inventor Fumio Morita 1-1-1, Kannagaragaike, Yawata City, Kyoto Prefecture Inside Tsurumi Works, Ltd. (72) Nobuyuki Yamada 7-5-2 Higashi Narashino, Narashino City, Chiba Prefecture Inside the company

Claims (10)

[Claims] 1. A manhole inflow detecting method for detecting an inflow amount of a liquid flowing into a manhole, comprising: a first level sensor for detecting that a liquid level in the manhole reaches a predetermined first level. And the first
A second level sensor that detects a second level at a position higher than the level sensor by a predetermined amount is provided, and the volume of the manhole between the first level sensor and the second level sensor is V,
The time when the first level sensor detects the liquid level of the first level is defined as t _1, and the time when the second level sensor detects the liquid level of the second level is defined as t _2. A method for detecting manhole inflow, comprising detecting a manhole inflow Qi per unit time. Qi = V / (t ₂ −t ₁ ) 2. A manhole inflow detection method manhole inflow per unit last detected time according to claim 1 and Qi _n-1, the manhole inflow per current unit time and Qi _n, lower A manhole inflow detection method characterized by detecting a manhole inflow Qi per unit time from an equation. _{Qi = (K 1 × Qi n} -1 + K 2 × Qi n) where K _1, K ₂ are weighting constants, the fractional as a K ₁ + K ₂ = ₁ 3. A pump is installed in the manhole, and when the liquid level in the manhole reaches the pump operation level, the pump is operated, and the pump in which the liquid level in the manhole is lower than the pump operation level by a predetermined amount is stopped. A pump discharge amount detection method for a manhole device configured to stop operation of the pump when the pump reaches a level, wherein the volume of the manhole between the pump operation level and the pump stop level is V, unit time A pump discharge amount detection device, wherein the pump discharge amount V _PO from the pump operation to the stop is calculated from the following equation, with the manhole inflow amount per contact being Qi and the pump operation time being t. V _PO = V + Qi × t 4. The pump discharge amount detection device for a manhole device according to claim 3, wherein the pump stop level is a first level, the pump operation level is a second level, and the manhole inflow amount Qi per unit time. 3. A device for detecting a pump discharge amount of a manhole device, comprising: means for detecting the inflow amount of manhole according to claim 1 for detecting the amount of inflow. 5. A pump is installed in the manhole, and when the liquid level in the manhole reaches the pump operation level, the pump is operated to discharge the liquid in the manhole, and the liquid level is reduced by a predetermined amount from the pump operation level. A pump suction blockage detection device for a manhole device configured to stop the operation of the pump when a lower pump stop level is reached, wherein an inflow amount for detecting an inflow amount of a liquid flowing into the manhole per unit time. detection means, the inflow amount detected by flow Iriryou detecting means and Qi, means for calculating a pump estimated operating time t _X from the following equation, liquid level from the start of the pump operation reaches the pump operation level Actual pump operation time t _P
And a pump operating time measuring means for measuring the pump expected operating time t _X and the pump actual operating time t _{P. If the} pump actual operating time t _P exceeds the pump expected operating time t _X for a predetermined time, the pump suction is blocked. A pump suction blockage detecting device for a manhole device, comprising: a pump blockage determining means for determining that the pump is blocked. _{t X = V / (Q P} -Qi) However, Q _P> Qi, V is manhole volume between the pump stop level and the pump operation level, the Q _P ejected minimum rated the pumping rate 6. A pump suction blockage according to claim 5, wherein said inflow amount detection means is means for detecting a manhole inflow amount using the manhole inflow amount detection method according to claim 1 or 2. Detection device. 7. A pump is installed in the manhole, and when the liquid level in the manhole reaches the pump operation level, the pump is operated to discharge the liquid in the manhole, and the liquid level becomes a predetermined amount from the pump operation level. A pump airlock detection device of a manhole device configured to stop the operation of the pump when a lower pump stop level is reached, wherein an inflow amount for detecting an inflow amount of a liquid flowing into the manhole per unit time. detection means, the inflow amount detected by flow Iriryou detecting means and Qi, means for calculating a pump estimated operating time t _X from the following equation, liquid level from the start of the pump operation reaches the pump operation level Actual pump operation time t _P
Means for measuring pump operation time, and a pump air lock determination for judging a pump air lock when the liquid position does not fall below the pump operation level even if the actual pump operation time t _P exceeds the expected pump operation time t _X. Means for detecting a pump airlock of a manhole device, characterized by comprising means. _{t X = V / (Q P} -Qi) However, Q _P> Qi, V is manhole volume between the pump stop level and the pump operation level, the Q _P ejected minimum rated the pumping rate 8. A manhole device according to claim 7, wherein said inflow amount detecting means is means for detecting a manhole inflow amount using the manhole inflow amount detection method according to claim 1 or 2. Pump airlock detector. 9. A pump is installed in the manhole, and when the liquid level in the manhole reaches the pump operation level, the pump is operated to discharge the liquid in the manhole, and the liquid level becomes a predetermined amount from the pump operation level. An abnormal inflow detection device for a manhole device configured to stop the operation of the pump when a lower pump stop level is reached, the inflow amount detecting the inflow amount of liquid flowing per unit time into the manhole. Detection means, the inflow detected by the inflow detection means exceeds the design maximum inflow of the manhole,
And an abnormal inflow detecting means for judging that the inflow is abnormal when the liquid level of the manhole reaches an alarm level set higher than the pump operation level. apparatus. 10. The inflow amount detecting means according to claim 1, wherein
10. A means for detecting a manhole inflow amount using the manhole inflow amount detection method according to claim 9.
4. The abnormal inflow amount detection device for a manhole device according to 4.