JP2000110225A - Method and device for controlling pump in vacuum sewerage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a large volume of sewage from flowing into and overflowing from a catchment tank at one time when a large volume of sewage is stored in a vacuum sewer pipe on the upstream side of a lift close to a vacuum station, and a vacuum pump is also started. SOLUTION: A vacuum sewerage system is provided with a vacuum pump 7 to evacuate a space in a catchment tank 5 to which a vacuum sewer pipe 3 is connected, and a force-feed pump 8 to feed the sewage collected in the catchment tank 5. The system controls the operation of the force-feed pump 8 and/or the vacuum pump 7 based on the elevation ratio of the sewage level in the catchment tank 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump control method and a pump control device in a vacuum sewer system.

[0002]

2. Description of the Related Art As shown in FIG. 7, a vacuum type sewer system collects sewage naturally flowing down from a building 1 such as a general household or a public facility in a vacuum valve unit (sewage smelt) 2 and collects the sewage. The vacuum suction (vacuum) generated at the vacuum station 4 through the vacuum drain pipe 3 is used to suck and collect the water into the water collecting tank 5 of the vacuum station 4 (for example, Japanese Patent Application Laid-Open No. -32099, Japanese Patent Laid-Open No.
0-159167).

According to such a vacuum type sewer system, the sewage stored in the vacuum valve unit 2 is sucked by the vacuum pressure (negative pressure) in the water collecting tank 5. Since the ascending pipe 6 called a lift can be provided, the burial depth of the vacuum sewer pipe 3 can be reduced, the construction cost can be reduced due to the speed of the construction, and the underground pipe is buried in the middle of the pipe. There is an advantage that even when there is an obstacle such as an object or a waterway, the obstacle can be easily avoided or crossed by the lift 6.

[0004] Such a vacuum-type sewer system comprises a plurality of vacuum valve units 2 for temporarily storing sewage naturally flowing down from a building 1 and the like, and a vacuum station 4 having a water collecting tank 5.
And a vacuum sewer pipe 3 that sucks sewage and air from the plurality of vacuum valve units 2 and conveys the vacuum water to the vacuum station 4.

[0005] The vacuum valve unit 2 serves as an interface between the vacuum type sewerage system and the drainage system on the premises of each building, and when a predetermined amount of sewage is stored,
It is provided with a suction pipe for sucking sewage in the sewage tank, and a vacuum valve provided at a connection between the vacuum sewer pipe 3 and the suction pipe. This vacuum valve operates using the vacuum pressure (negative pressure) of the vacuum sewer pipe as power, and when the sewage in the sewage tank exceeds a predetermined valve opening level, the valve is opened and drops below a predetermined valve closing level. Or when a predetermined time elapses from the opening of the valve.

The vacuum sewer pipe 3 is an airtight pipe connecting the vacuum station 4 and the vacuum valve unit 2, and the pipe diameter is gradually reduced from the vacuum station 4 toward a large number of vacuum valve units 2. It is laid in a tree shape.
Basically, it is laid with a downward slope, but a lift 6 is provided at a point where the burial depth has increased to some extent to reduce the burial depth. In this lift, sewage is transported by the air expanding in the pipe acting to lift the sewage. In the vacuum sewage pipe 3, a mixed phase flow of sewage and air occurs in a relatively small portion of the pipe diameter near the vacuum valve unit 2, and the sewage and air flows up and down in a relatively thick portion of the pipe diameter near the vacuum station 4. It tends to be a two-layer flow divided into two.

The vacuum station 4 has a vacuum pump 7 for making the upper space in the water collecting tank 5 a vacuum atmosphere,
A pump 8 for sending sewage collected in the water collecting tank 5 to a sewage treatment plant and the like, and a control device 9 for controlling operations of the vacuum pump 7 and the pump 8 are provided.

As shown in FIG. 8, a control device 9 includes a pressure sensor 10 for measuring a vacuum pressure in the internal space of the water collecting tank 5.
(Tank pressure detecting means), a water level sensor 11 (water level detecting means) for detecting the water level of the sewage in the tank 5, and start and stop of the pumps 7, 8 according to the outputs of these sensors 10, 11. It is constituted by operation control means 20 such as a sequencer.

The operation of the vacuum pump 7 is controlled mainly based on the vacuum pressure in the tank, and the degree of vacuum rises and the vacuum pressure (negative pressure) in the tank becomes higher than -7.0 mAq (that is, the pressure becomes lower). ), The vacuum pump 7 is stopped, and when the degree of vacuum is reduced and the vacuum pressure in the tank becomes lower than −6.0 mAq (that is, the pressure is increased), the vacuum pump 7 is activated to thereby reduce the vacuum pressure in the tank. To about -7.0 mAq
The value is kept within a range of -6.0 mAq. In order to prevent a large amount of sewage from flowing into the tank 5 in a short time, the sewage overflows from the tank 5 and the sewage flows into the suction pipe to the vacuum pump 7 connected to the upper part of the tank. , The sewage has a predetermined water level H. H. W. When the water level sensor 11 detects that L has been exceeded, the vacuum pump 7 is forcibly stopped regardless of the vacuum pressure in the tank.

The operation of the pressure pump 8 is controlled based on the level of the sewage in the tank 5, and the high water level H.P. W. L, the pump 8 is started, and the low water level L. W. By stopping the pump 8 when the water level falls to L, the water level becomes as high as possible. W. L and low water level L. W. L is maintained in the range.

Also, failure of the pumps 7 and 8 and the collecting tank 5
When the vacuum pressure in the tank becomes equal to or less than a predetermined value (for example, -4.5 mAq) in order to detect that the pressure in the tank or the water level of the sewage has become an abnormal value due to breakage of the pipe or the piping, And the water level of sewage is V. H. W. L or more.
L. W. It is set so that an alarm is issued when it becomes L or less.

According to the conventional vacuum type sewer system described above, when a predetermined amount of sewage accumulates in the sewage tank of the vacuum valve unit, the vacuum valve is opened, and the sewage in the sewage tank is evacuated to the vacuum pressure in the collection tank. Is drawn into the vacuum sewer pipe 3 and
By repeating this inflow, the sewage in the vacuum sewage pipe 3 is discharged together with the newly introduced sewage.
The sewage in the vacuum sewer pipe 3 is sucked into the water collecting tank by being pushed by the air flowing into the inside.

[0013]

According to the above-described control method, the apparatus operates normally in most time zones.
In the time zone when the amount of sewage in the morning suddenly increases, alarms may be issued frequently even though no failure occurs.

According to the findings of the inventors of the present application, the cause is as follows. That is, during the night when the sewage is hardly drained, the level of the sewage in the sewage tank of the vacuum valve unit 2 hardly rises, so that the vacuum valve is rarely opened. As a result, the force for lifting sewage in the lift 6 near the vacuum station 4 becomes weak, and the lift 6
The sewage is stored in the vacuum sewer pipe 3 on the upstream side, and a large amount of sewage accumulates in the vacuum sewer pipe 3 for a long distance. When the amount of sewage discharge in the morning increases rapidly, the vacuum valves of many vacuum valve units 2 of the entire system are opened, and the vacuum pump 7 is started in response thereto. This is because it flows into 5.

On the other hand, assuming that such a phenomenon will occur, operating the pump at a large pumping capacity at all times will accelerate the deterioration of the pump and necessitate frequent maintenance. Installing a large capacity water collection tank is inefficient and uneconomical. further,
Since the power equipment of the system is centrally installed in the vacuum station, it is desired to solve the above-mentioned problem by controlling the operation of the equipment in the vacuum station.

Accordingly, the present invention provides a method for increasing the level of sewage in a collection tank when a large amount of sewage accumulated on the upstream side of the lift flows into the collection tank because the sewage flows continuously. It is an object of the present invention to prevent the water level from rising too much by the sewage flowing into the collecting tank at a time by controlling the operation of the pump based on the water level rising rate by paying attention to the increase in the water rate.

[0017]

SUMMARY OF THE INVENTION The present invention provides a vacuum pump for creating a vacuum atmosphere in a space of a water collecting tank to which a vacuum sewer pipe is connected, and a pressure feed for sending out sewage collected in the water collecting tank. In a vacuum type sewer system provided with a pump, the following technical measures have been taken to achieve the above object.

That is, the pump control method of the present invention provides a pump for pumping and / or a pump based on the rate of rise of the level of sewage in a collecting tank.
Alternatively, the operation of the vacuum pump is controlled.

According to this control method, when the sewage continuously flows into the water collecting tank, the rate of rise of the water level of the sewage in the tank increases. For example, when the rate of rise in the water level exceeds a predetermined value, the rise in the water level can be suppressed by increasing the delivery capacity of the pressure pump or by urgently stopping the vacuum pump. Therefore, the operation of the alarm system for notifying that the water level has become abnormally high is also suppressed.

The operation control of the pressure pump and / or the vacuum pump based on the water level rise rate may be always performed,
It may be performed only in a predetermined case. For example, the operation control of the present invention may be performed only in a predetermined time period (such as a time period in which the amount of sewage in the morning is expected to increase rapidly). Further, the operation control of the present invention can be performed only when it is predicted that a large amount of sewage flows in by various sensors.

In the above-mentioned vacuum type sewer system having a plurality of pressure pumps, the operation control of the pressure pump based on the rise rate of the water level in the tank is performed when the rise rate of the water level of the sewage in the collection tank exceeds a predetermined value. In addition, the operation control of the plurality of pumps may be performed so that the wastewater is sent out by a greater number of pumps than when the pumping is not exceeded.

According to this control method, a large number of sewage can be continuously collected at once, while prolonging the life of the pumps by alternately operating a small number of pumps during normal times. When flowing into the tank,
By increasing the number of operating pumps to increase the amount of sewage discharged, it is possible to prevent the level of sewage in the tank from becoming abnormally high. Even if the amount of sewage flowing from the vacuum sewer pipe is constant, the water level rise rate when all the pumps are stopped, and the water level rise rate when some of the pumps are operating are Therefore, it is preferable to set a predetermined value to be compared with the water level rise rate according to the amount of sewage delivered by the pressure pump.

It is to be noted that a pump having a variable delivery capacity can be used. In this case, the delivery capacity of the pump is set to be larger when the rate of rise of the water level exceeds a predetermined value than when the rate of rise does not exceed the predetermined value. The operation of the pump may be controlled.
When such a variable-pressure pump is used, the control of the present invention described above can be performed by one pump.

In addition, the operation control of the vacuum pump based on the rise rate of the water level in the tank suppresses the rise in the degree of vacuum in the water collection tank when the rise rate of the water level of the sewage in the water collection tank exceeds a predetermined value. Thus, the operation of the vacuum pump can be controlled. According to this control method, in the process where a large amount of sewage is continuously flowing into the water collecting tank, an increase in the degree of vacuum in the tank is suppressed by operation control of the vacuum pump, and accordingly, the sewage suction power is also reduced. As a result, the inflow of sewage decreases.

Therefore, the normal operation flow of the vacuum pump is such that the vacuum pump is started when the degree of vacuum in the water collecting tank is lower than a predetermined value, and when the degree of vacuum in the tank is higher than the predetermined value. Even when the vacuum pump is stopped, a large amount of sewage is continuously flowed into the collection tank, and when the rate of rise of the sewage in the tank exceeds a predetermined value, the degree of vacuum in the tank is reduced. Regardless, an emergency stop of the vacuum pump or the like prevents an excessive amount of wastewater from flowing into the water collecting tank. After the emergency stop of the vacuum pump, the excess capacity of the water collecting tank is increased by operating the pressure pump until the sewage reaches a predetermined water level. By preparing for the inflow at once,
The water level can be prevented from becoming abnormally high.

Further, the present invention includes a vacuum pump for making a space in the water collecting tank to which the vacuum sewer pipe is connected a vacuum atmosphere, and a pressure pump for sending out sewage collected in the water collecting tank. A pump control device provided in a vacuum type sewer system, comprising: setting means for setting a comparison value within a predetermined range; and a water level rising rate for detecting a rising rate of water level per unit time of sewage in a collection tank. Detecting means, and operation control means for operating the vacuum pump and / or the pressure pump in an operation flow according to the result of comparing the water level rise rate detected by the means with the comparison value set by the setting means. It is characterized by the following.

According to the pump control device of the present invention,
The vacuum pump and / or the pressure pump can be operated with an appropriate operation flow according to the water level rise rate. Therefore, when the water level rise rate is not high, the vacuum pump is controlled so as to maintain the degree of vacuum in the tank within a certain range. While controlling and controlling the pump to prevent early deterioration due to continuous operation, the water level rises only when the rate of rise of the water level is high, rather than maintaining the degree of vacuum in the tank or extending the life of the pump. By performing the control with emphasis on suppression, it is possible to prevent the water level from becoming abnormally high.

In the case where the vacuum type sewer system has a plurality of pumps, the pump control device of the present invention includes an operation control means for operating the plurality of pumps in a predetermined operation flow, Setting means for setting within the range, comprising a water level rise rate detection means for detecting the rise rate of the water level of the sewage in the water collection tank, the operation control means,
When the water level rise rate detected by the water level rise rate detection means exceeds the comparison value set by the setting means, a plurality of pressure pumps are operated so as to send sewage by a larger number of pressure pumps than when the water level rise rate does not exceed the comparison value. It may be configured to control.

Further, the pump control device of the present invention comprises: operation control means for operating the vacuum pump according to a predetermined operation flow; setting means for setting a comparison value within a predetermined range; Water level rise rate detection means for detecting a rise rate of the water level, wherein the operation control means collects when the water level rise rate detected by the water level rise rate detection means exceeds the comparison value set by the setting means. The operation of the vacuum pump may be controlled so as to suppress an increase in the degree of vacuum in the water tank.

The operation control means for the pressure pump and the operation control means for the vacuum pump can be constituted by a common sequencer.

Further, the water level rise rate detecting means includes a water level detection means for detecting a water level of the sewage in the water collecting tank, and an arithmetic means for calculating a water level rise rate based on an output signal from the detection means. The calculation result of the calculating means may be a detection value of the water level rise rate detecting means. According to this configuration, since the water level rise rate is detected from the output signal of the water level detection means, it is not necessary to separately provide a sensor for detecting the water level rise rate.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. Since the basic configuration of the vacuum type sewer system is the same as that of the above-described conventional technology, the detailed description thereof is omitted by attaching the same reference numerals, and the embodiments of the pump control device and the pump control method of the present invention will be described in detail. explain.

FIG. 1 shows a piping configuration connected to the water collecting tank 5 constituting the vacuum station 4 and a block configuration of the pump control device 9. In the drawings, the piping is shown by a thick line, and the wiring is shown by a thin line.

In this embodiment, a plurality of vacuum sewer pipes 3 are connected to the upper part of the water collecting tank 5. Further, two vacuum pumps 7 are provided, each of which is connected to the upper part of the water collecting tank 5 via an intake pipe 12 and an exhaust pipe 13 of the vacuum pump 7 is provided with a deodorizing device (not shown). )). By the operation of the vacuum pump 7, gas present in the space in the water collecting tank 5 is forcibly evacuated, and a vacuum pressure sufficient to suck the sewage stored in the vacuum valve unit 2 to the water collecting tank 5 is generated. I am trying to get it.

Further, two pumps 8 are provided, and a suction pipe 14 is connected to a suction port of each pump 8, and the leading end opening of the suction pipe is located at the bottom in the water collecting tank 5. It is arranged so that sewage can be discharged from the tank bottom. A delivery pipe 15 is connected to the delivery port of the pressure delivery pump 8, and the delivery pipe 15 is connected to a sewage treatment plant or the like. In the middle of the delivery pipe 15, a flow sensor 1 for detecting the amount of sewage delivered by the pressure pump 8 is provided.
6 are provided.

The pump control unit 9 includes a pressure sensor 10 for detecting the pressure in the upper space in the water collecting tank 5, a water level sensor 11 for detecting the water level of the sewage in the tank, the flow rate sensor 16, and these sensors 10. , 11 and 16, and operation control means 20 for controlling the operations of the vacuum pump 7 and the pressure pump 8. Note that, as the water level sensor 11, a differential pressure sensor that detects a water level by a differential pressure between the pressure in the upper space in the tank and the pressure in the bottom of the sewage in the tank is used, but the present invention is limited to this mode. Not something.

The operation control means 20 includes a general-purpose sequencer,
It can be configured by a general-purpose computer, or can be configured by an electric circuit designed for the system. Preferably, a general-purpose sequencer can be used.

FIG. 2 is a virtual circuit block diagram of the pump control device 9. The output signals of the pressure sensor 10 and the water level sensor 11 are input to the operation control means 20, and the output of the water level sensor 11 is The signal is also input to the calculating means 21. The calculating means 21 is provided with the water level sensor 11
Calculates the rate of rise of the water level per unit time based on the change over time of the output signal from. The calculation result 21 is input to the operation control means 20, and the water level sensor 1
1 and the calculating means 21 constitute a water level rise rate detecting means. The arithmetic unit 21 may be configured in a sequencer or a computer common to the operation control unit 20, or may be configured by an external circuit connected to a sequencer or the like included in the operation control unit 20.

The operation control means 20 is provided with a setting means 22 which can set a comparison value with the water level rise rate within a predetermined range. The setting unit 22 can have an appropriate configuration such as a volume provided in a sequencer, a storage unit (memory) in a computer, and the like.

The comparison value set in the setting means 22 is:
The operation control unit 20 compares the output of the arithmetic unit 21, that is, the water level rise rate, and controls the vacuum pump 7 and the pressure pump 8 in an operation flow according to the result. Such a configuration can be realized by a sequencer or a computer program, or can be realized by a dedicated control circuit.

The operation flow of the control can be designed in various ways. As the operation control of the vacuum pump 7 based on the water level rising rate, for example, the rising rate of the water level of the sewage in the water collecting tank 5 is determined by the setting means 22. Is exceeded, the vacuum pump 7 is forcibly stopped so as to suppress an increase in the degree of vacuum (that is, a decrease in pressure) in the water collecting tank 5, or the amount of suction of the vacuum pump 7 is reduced. It is conceivable to reduce it. In addition, when the water level rise rate does not exceed the comparison value, the operation control based on the vacuum pressure in the tank can be performed as in the related art.

As described above, when the rate of rise of the water level is high, the suction force of the sewage from the vacuum sewer pipe 3 is reduced by suppressing the increase in the degree of vacuum in the tank, and the amount of sewage flowing into the tank 5 is temporarily reduced. By reducing the water level and operating the pressure pump 8 during that time to lower the water level in the tank, it is possible to prevent the tank 5 from being filled with dirty water and flowing into the vacuum pump 7.

As the operation control of the pressure pump 8 based on the water level rising rate, the rising rate of the water level in the water collecting tank 5 is as follows.
When the comparison value set by the setting means 22 is exceeded, the two pumping pumps 8 are operated simultaneously.
The pressure pump 8 can be operated alternately for each unit.
In addition, when the water level rise rate does not exceed, the pressure pump 8
Can be the same control as the conventional one based on the water level in the tank.

According to the operation control of the plurality of pumps 8, the amount of sewage discharged by the pump 8 is increased only when the water level rise rate is high, and the abnormally high water level is maintained even when a large amount of sewage flows in. In addition, by operating the pumps 8 alternately one by one at normal times, the life of the pump 8 can be extended.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the control based on the water level rise rate can be performed only on the vacuum pump 7 or only on the pump 8. The number of the pumps 7 and 8 is not particularly limited, and one each, or
There can be three or more.

[0046]

3 and 4 show one embodiment of the operation flow of the pressure feed pump 8. FIG. To explain sequentially, in step S1, the water level in the water collecting tank 5 is set to the critical low water level (Low Low).
Water Line). If the water level is lower than the critical low water level, there is a possibility that some trouble or breakage has occurred, so the process branches to the alarm control shown in FIG. Step S1 is an important process for preventing the inside of the water collecting tank 5 from being emptied, and for preventing air from flowing into the pressure pump 8 and the suction pipe 14.

As shown in FIG. 4, the operation flow of the alarm control is to stop the pump 8 and start an alarm. Such an alarm can be given by an appropriate means such as notification by an alarm provided in the operation control means 20 or notification to a centralized monitoring system connected to the operation control means 20 via communication means such as a telephone line. it can.

After the alarm starts, the water level in the tank becomes low (Low water level).
Water level), and after the sewage flows into the water collection tank 5 from the vacuum sewer pipe 3 to exceed the low water level, the pump 8
, The alarm is reset, the alarm is reset, and the control returns to the normal control.

If it is confirmed in step S1 that the water level has not fallen to the critical low water level, the process proceeds to step S2. In step S2, the water level in the tank is set to the high water level (High W
ater Level).

When the water level in the tank is lower than the starting water level of the pressure pump, the flow shifts to step S3 to determine whether or not the water level rising rate exceeds the first comparison value set by the setting means 22. . The first comparison value corresponds to the water level rise rate when the pressure pump 8 is not started, that is, when the sewage is not sent from the water collecting tank 5. If the rate of rise in water level exceeds the first comparison value, it is assumed that a large amount of sewage will continue to flow in from the vacuum sewer pipe 3, and both pump pumps 8 are started to double the amount of sewage discharged. This prevents the water level from becoming abnormally high. Thereafter, in step S4, the pump 8 is operated until the water level becomes low (Low Water Level).

In step S2, when the water level in the tank exceeds the starting water level, the next pump of the two pumps 8 to be operated is selected and the selected pump 8 is started. Then, the pump 8 is operated until the water level in the tank becomes the low water level. Even when such a single pump is operated, the operation flow is branched based on the water level rising rate in step S5. That is, during operation of one of the pumps, it is determined whether or not the water level rise rate exceeds the second comparison value. The second comparison value may be set by a setting unit configured separately from the first comparison value, or may be detected by the flow sensor 16 and the first comparison value set by the setting unit 22. It can be obtained from the difference from the delivery amount during the operation of one pump. Then, when the water level rise rate exceeds the second comparison value, the two pumps 8 are started.

Thereafter, when the water level in the tank has dropped to the low water level LWL, the pump 8 is stopped, and step S
Return to 1.

FIGS. 5 and 6 show an embodiment of the operation flow of the vacuum pump 7. FIG. To explain sequentially, in step S6, the vacuum pressure (negative pressure) of the upper space in the water collecting tank 5
However, when the degree of vacuum is smaller than -4.5 mAq set as the abnormal pressure, the failure of the vacuum pump 7 or the tank 5
Since there is a possibility that air leakage has occurred, the process branches to the alarm control shown in FIG.

The operation flow of the alarm control of the vacuum pump 7 is as follows.
As shown in FIG. 6, the emergency stop of the vacuum pump 7 and the alarm start. Such an alarm is issued by the operation control means 20.
And an appropriate means such as notification to a centralized monitoring system connected to the operation control means 20 via communication means such as a telephone line.

After the start of the alarm, the alarm continues to be issued even if the vacuum in the tank exceeds the normal pressure range of -6.0 mAq, and the alarm is manually reset.

If it is confirmed in step S6 that the vacuum pressure in the tank is within the normal range, the process proceeds to step S7. In the step S7, it is determined whether or not the vacuum pressure in the tank exceeds -6.0 mAq, which is the starting pressure of the vacuum pump 7. If the starting pressure has not been reached, the process returns to step S6. If the starting pressure has been reached, the vacuum pump 7
Start

Next, the process proceeds to step S8, and it is determined whether or not the water level rise rate exceeds the comparison value set by the setting means 22 after the vacuum pump 7 is started. In addition, such a comparison value can be set according to the amount of sewage delivered by the pump 8. For example, the difference between the setting value of the setting means 22 and the detection value of the flow sensor 16 can be used as a comparison value.

When the rate of rise of the water level exceeds the comparison value, a large amount of sewage is flowing into the water collecting tank 5, so that the vacuum pump 7 is temporarily stopped. At this time, as described above, since both of the two pumps 8 are started, the water level in the tank can be quickly lowered together with the suppression of the increase in the degree of vacuum in the tank due to the stop of the vacuum pump 7. It becomes possible.
Then, the vacuum pump 7 is stopped until the sewage is sent out by the pressure feed pump to a low water level, and the vacuum pump 7 is started again after the low water level. Even if the vacuum pump 7 is forcibly stopped until the water level becomes low as described above, the sewage is stored in the vacuum drain pipe 3 near the water collecting tank 5 at this time. Not a small amount of sewage is introduced by the start, and the water level does not become too low.

When the water level rise rate does not exceed the comparison value after the start of the vacuum pump 7, the process proceeds to step S9, and the vacuum pressure in the tank is the stop pressure of -7.0 mA.
It is determined whether or not q has been exceeded, and if not, control is returned to step S8 to continuously operate the vacuum pump 7, and if it has been exceeded, the vacuum pump 7 is stopped and control is returned to step S6. .

With this control method, when a large amount of sewage is accumulated in the vacuum drain 3 upstream of the lift 6 provided at the position closest to the vacuum station 4,
Even if the vacuum pump 7 is activated and is about to flow into the water collecting tank 5 at a stretch, it is detected in advance by the water level rise rate shortly after the inflow is started, and the delivery amount of the pump 8 is doubled and the degree of vacuum is reduced. The operation of the vacuum pump 7 can be controlled so as to suppress the rise, and it is possible to prevent the water level in the tank from becoming abnormally high.

[0061]

According to the present invention, the operation of the pressure pump and / or the vacuum pump is controlled based on the rate of rise of the level of sewage in the water collecting tank, so that the water is collected on the upstream side of the lift immediately before the vacuum station. When a large amount of sewage flows into the tank, the pump and / or vacuum pump can be operated properly to prevent the water level in the tank from becoming too high. It can be prevented that a warning is issued.

Further, the present invention provides a plurality of pumps for feeding sewage by a larger number of pumps than when the rate of rise of the level of sewage in the water collection tank exceeds a predetermined value. During normal operation, multiple pumps are operated alternately during normal operation to prolong the service life of the pumps, while a large amount of sewage accumulated on the upstream side of the immediately preceding lift flows in. When it is done, the occurrence of such inflow is detected by the rate of rise in the level of sewage,
By controlling the plurality of pumps to operate at the same time, it is possible to increase the amount of discharged sewage and to suppress the water level from becoming too high.

Further, the present invention controls the operation of a vacuum pump so as to suppress an increase in the degree of vacuum in the water collecting tank when the rate of increase in the level of sewage in the water collecting tank exceeds a predetermined value. Therefore, when a large amount of sewage accumulated on the upstream side of the immediately preceding lift flows in, the occurrence of such inflow is detected by the rate of rise of the sewage water level, so that the vacuum degree is suppressed, for example, by vacuum. Stop the operation of the pump,
Prevents a large amount of sewage from flowing in at a stretch,
This can suppress the water level from becoming abnormally high.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vacuum station according to an embodiment of the present invention.

FIG. 2 is a block diagram of a pump control device according to the embodiment.

FIG. 3 is a flowchart showing one embodiment of an operation flow of the pressure feed pump.

FIG. 4 is a flowchart of alarm control of the pressure pump.

FIG. 5 is a flowchart showing an embodiment of an operation flow of the vacuum pump.

FIG. 6 is a flowchart of alarm control of the vacuum pump.

FIG. 7 is a simplified vertical sectional view of the system.

FIG. 8 is an explanatory diagram of control in a vacuum station of the system.

[Explanation of symbols]

 3 Vacuum sewer pipe 5 Water collecting tank 6 Lift 7 Vacuum pump 8 Pumping pump 9 Pump controller 11 Water level detecting means 20 Operation control means 22 Setting means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D063 AA07 DC06 3H045 AA06 AA09 AA16 AA23 AA39 BA25 BA26 CA16 CA17 CA26 DA01 DA31 EA38 5H309 AA07 BB08 CC04 CC09 DD04 DD08 DD27 EE05 FF17 GG03 HH02 HH09 JJ02

Claims (9)

[Claims] 1. A vacuum sewer system comprising a vacuum pump for creating a vacuum atmosphere in a water collecting tank to which a vacuum sewer pipe is connected, and a pressure pump for sending out sewage collected in the water collecting tank. A method of controlling the operation of a pressure pump and / or a vacuum pump based on a rising rate of the level of sewage in a water collecting tank. 2. A vacuum system comprising: a vacuum pump for making a space in a water collecting tank connected to a vacuum sewer pipe into a vacuum atmosphere; and a plurality of pressure pumps for sending out sewage collected in the water collecting tank. In the sewage system, when the rising rate of the sewage water level in the collection tank exceeds a predetermined value, the operation control of the plurality of pumps is performed so that the sewage is sent out by a larger number of pumps than when the rate does not exceed. A pump control method in a vacuum type sewer system characterized by the above-mentioned. 3. A vacuum system comprising: a vacuum pump for converting a space in a water collecting tank to which a vacuum sewer pipe is connected into a vacuum atmosphere; and a plurality of pressure pumps for discharging sewage collected in the water collecting tank. In the sewage system, when the rate of rise of the level of sewage in the water collection tank exceeds a predetermined value, the vacuum pump is characterized in that the operation of the vacuum pump is controlled so as to suppress a rise in the degree of vacuum in the water collection tank Pump control method in a sewer system. 4. The vacuum sewer system according to claim 3, wherein the operation control of the vacuum pump stops the vacuum pump when a rising rate of the level of the sewage in the water collecting tank exceeds a predetermined value. Pump control method. 5. The pump control method in a vacuum sewer system according to claim 4, wherein after the vacuum pump is stopped, the pressure pump is operated until the sewage reaches a predetermined water level. 6. A vacuum type sewerage system comprising: a vacuum pump for making a space in a water collecting tank to which a vacuum sewer pipe is connected a vacuum atmosphere; and a pressure pump for sending out waste water collected in the water collecting tank. A pump control device provided with: a setting means for setting a comparison value within a predetermined range; a water level rise rate detecting means for detecting a rise rate of water level per unit time of sewage in the collection tank; Operation control means for operating the vacuum pump and / or the pressure feed pump in an operation flow according to the result of comparing the water level rise rate detected by the means with the comparison value set by the setting means. Pump control device for vacuum type sewer system. 7. A vacuum system comprising: a vacuum pump for creating a vacuum atmosphere in a water collecting tank to which a vacuum sewer pipe is connected; and a plurality of pressure pumps for feeding sewage collected in the water collecting tank. A pump control device provided in a sewerage system, comprising: operation control means for operating the plurality of pumps in a predetermined operation flow; setting means for setting a comparison value within a predetermined range; Water level rise rate detecting means for detecting the rise rate of the water level of the sewage, the operation control means, when the water level rise rate detected by the water level rise rate detection means exceeds the comparison value set by the setting means A pump control device for a vacuum sewerage system, wherein the pump control device is configured to control the operation of a plurality of pumps so as to send out sewage with a greater number of pumps than when not exceeding. 8. A vacuum sewerage system comprising: a vacuum pump for creating a vacuum atmosphere in a water collecting tank to which a vacuum sewer pipe is connected; and a pressure pump for sending out sewage collected in the water collecting tank. An operation control means for operating the vacuum pump in a predetermined operation flow, a setting means for setting a comparison value within a predetermined range, and a water level of the sewage in the water collection tank Water level rise rate detection means for detecting a rise rate, wherein the operation control means, when the water level rise rate detected by the water level rise rate detection means exceeds the comparison value set by the setting means, the water collecting tank A pump control device for a vacuum sewer system, wherein the pump control device is configured to control the operation of a vacuum pump so as to suppress an increase in the degree of vacuum in the inside. 9. The water level rise rate detection means includes a water level detection means for detecting a water level of sewage in a water collecting tank, and a calculation means for calculating a water level rise rate based on an output signal from the detection means. 9. The pump control device for a vacuum sewer system according to claim 6, wherein the calculation result of the calculation means is a detection value of a water level rise rate detection means.