JPH0797823A - Pressure type sewage system - Google Patents

Abstract

PURPOSE:To prevent an overload from working on a pump by making a comparison between the operation number of pumps in each pipe line and the number of concurrently operable pumps set for every pipe line, and keeping standby state for the operation of such pumps as exceeding an allowable concurrent operation number. CONSTITUTION:A monitor control section 12 makes a comparison between information sent from each pump unit control section 11 regarding the operation number of grinder pumps 2 corresponding to each pipe line, and the allowable concurrent operation number of the pumps 2 set for every pipe line. Also, the section 12 outputs information regarding the acceptance of the operation of the pumps 2 to the corresponding control sections 11 for pump units GP1, GP2 and so forth, when an allowable concurrent operation number is not exceeded, thereby causing the pumps 2 to operate. On the other hand, if the allowable concurrent operation number is exceeded, the section 12 outputs information on the non-acceptance of the operation of the pumps 2 to the corresponding control sections 11 for the pump units GP1, GP2 and so forth, thereby keeping the pumps 2 in standby state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure type sewer system for pumping sewage to a treatment plant by a plurality of pump units and a pipeline network.

[0002]

2. Description of the Related Art Generally, a change in the inflow of sewage to a pipeline network in one day is almost stable every day, and in a pressure type sewer system, the sewage amount rush hours during which the sewage discharge in one day is concentrated. If necessary, a plurality of pump units and a network of pipes connecting the pump units are appropriately arranged so that the pumping process can be performed without difficulty.

The wastewater discharged from each household flows into the wastewater tank of each pump unit and is temporarily stored therein. Each sewage tank is equipped with a start water level detection sensor and a stop water level detection sensor that detect the amount of sewage, and each pump unit control unit determines the water level of the sewage water stored in the sewage tank at the start water level detection sensor position. When it reaches, the pump is activated by the detection signal and the wastewater in the wastewater tank is controlled to be drained to the pipeline.By the operation of this pump, the level of the wastewater in the wastewater tank decreases and the stop water level detection sensor When the position was reached, the detection signal controlled the pump to stop operating.

Then, the waste water drained by each pump is configured to be pumped to a predetermined treatment site through a pipeline network.

[0005]

However, at the beginning of the installation of the pressure type sewer system, even if the capacity of each pump and the pipe diameter of the pipeline are sufficient in the rush hour rush hour. However, when the amount of sewage discharged increases due to the population increase year by year, there may occur a situation in which the capacity of each pump and the pipe diameter are insufficient.

That is, when each pump is in a rush state in which the pump is operated, the flow rate of the sewage pumped to the pipeline increases, so that the pressure loss in the pipeline increases and the motor driving the pump is overloaded. In addition to the action, a situation occurs in which the discharge flow rate becomes zero even if the pump connected to the pipeline having a large head is operating.

On the other hand, as a means for reducing the flow rate of sewage to the pipeline during the rush hour of the sewage amount, Japanese Patent Laid-Open No. 1-22
There is a structure disclosed in Japanese Patent Publication No. 47623. That is, according to the invention disclosed in this publication, in the rush hours of the pump, as a method of reducing the number of operating pumps, the operation start water level is compared with the water level after a predetermined period of time, and if the water level is lowered. , The one that stops the operation of the pump regardless of the operation stop water level, and the operation start water level and the water level after a lapse of a predetermined time among the operating pumps when the allowable number of simultaneously operating pumps is exceeded. In comparison, a system in which a water level is stopped regardless of the water level at which operation is stopped is disclosed.

However, according to the invention disclosed in this prior art publication, the operation start water level is compared with the water level after a lapse of a predetermined time, and if the water level is lowered, the operation of the pump is stopped. Each pump is overloaded until a certain period of time elapses, and even after that, the pump is allowed to overload until the water level drops.

Further, regardless of the water level at which operation is stopped, the pump is stopped even when the amount of waste water in each water tank is close to the water level at which the water starts to operate. Since the operation will be restarted, there is a large possibility that the above-mentioned operation of stopping the pump will be frequently repeated, the mitigation of the flow rate of sewage to the pipeline cannot be effectively achieved, and the above situation may occur. .

Further, there is a drawback that the pump capacity, pipe diameter, etc. in the existing pressure type sewer system cannot be easily changed.

In view of the above problems, it is therefore an object of the present invention to provide a pressure type sewer system which can effectively prevent overload operation of a pump and efficiently pump sewage according to a pipeline.

[0012]

The technical means for achieving the above object is to provide a plurality of pump units each having a pump for pumping the sewage flowing into the sewage tank and a pipe line connecting the pump units. In a pressure type sewer system that pumps sewage to a treatment plant through a net, water level detection sensors that detect the starting water level and the stop water level of the amount of sewage flowing from each sewage discharge source into each sewage tank and temporarily stored are provided. , A pump unit control unit for controlling the operation stop of each pump according to a detection signal from the water level detection sensor, and a monitoring control unit for monitoring and controlling the operating state of each pump, and the monitoring control unit includes each pipeline. The maximum number of pumps that can be operated simultaneously is compared with the preset number of pumps that can be operated simultaneously for each pipeline. The operation of up to cause a standby state, in that it outputs a standby signal.

[0013]

According to the present invention, in a normal time period when the discharge amount of sewage is not concentrated, in general, the number of operating pumps corresponding to each pipeline may exceed the allowable simultaneous operating number in that pipeline. Even if the monitoring control unit monitors the operating state of each pump, there is no fear that the standby signal is output from the monitoring control unit. Therefore, when the amount of sewage flowing into each sewage tank from each sewage discharge source reaches the starting water level position, the water level is detected by the water level detection sensor, and based on the detection signal, each operation command from each pump unit controller Thus, each pump is started up.

When the pump is operated, the sewage in the sewage tank is drained to the pipeline, the level of the sewage in the sewage tank is lowered, and when the stop water level is reached, the water level is detected by the water level detection sensor, The operation of each pump is stopped by each stop command from each pump unit controller based on the detection signal. The above control operation is repeated in the normal time zone.

Next, in the rush hour rush hour when the discharge amount of sewage is concentrated, the number of pumps corresponding to each pipeline may exceed the allowable number of simultaneous operations in that pipeline. In this case, The monitoring control unit compares, for each pipeline, the operating number of pumps corresponding to the pipeline with the allowable simultaneous operation number in the pipeline, and outputs a standby signal when the allowable simultaneous operation number is exceeded, and Put the pumps that are trying to exceed the allowable number of simultaneous operation into standby.

Here, the number of pumps operating in each pipeline can be suppressed within the allowable number of simultaneous operations, the overload operation of the pumps can be effectively prevented, and the wastewater can be efficiently pumped according to each pipeline. .

When the number of simultaneously operated vehicles is less than the allowable number,
The pump in the standby state is started up.

[0018]

Embodiments of the present invention will now be described with reference to the drawings. In FIGS. 2 and 3, GP1, GP2, ...
・ GPn is a pump unit, and pipelines P1 and P
2 ... Pn network connected to each other
1, P2, ... Pn network is configured to pump wastewater to a predetermined treatment site.

Each pump unit GP1, GP2, ... G
Each Pn comprises a sewage tank 1 and a grinder pump 2 arranged in the sewage tank 1, and sewage discharged from each house 3 as a sewage discharge source is passed through an inflow pipe 4 to each pump unit by a natural flow system. GP1, GP2, ... GP
n will guide you.

By operating the grinder pump 2,
The waste water stored in the waste water tank 1 is configured to be pressure-fed to the pipelines P1, P2, ... Pn through the discharge pipe 5.

In the waste water tank 1, in order to detect the water level of the waste water, the stop water level detecting sensor 7 and the start water level detecting sensor are respectively set to at least three levels of the stop water level LWL, the starting water level HWL and the abnormal water level HHWL of the grinder pump 2. 8. An abnormal water level detection sensor 9 is provided.

Each pump unit GP1, GP2, ... G
Each Pn is provided with a pump unit control unit 11 including a pump unit control panel and the like, and the pump unit control unit 11 detects detection signals from the stop water level detection sensor 7, the starting water level detection sensor 8, and the abnormal water level detection sensor 9, The grinder pump 2 is configured to capture a signal indicating whether the grinder pump 2 is in operation and control the operation of the grinder pump 2 to stop.

That is, when the water level of the sewage in the sewage tank 1 reaches the position of the starting water level detecting sensor 8, the water level is detected by the starting water level detecting sensor 8 and the operation command from the pump unit control section 11 is based on the detection signal. Thus, the grinder pump 2 is controlled to be started.

Then, by operating the grinder pump 2, the wastewater in the wastewater tank 1 is discharged to the pipes P1, P2, ... Pn, the water level of the wastewater in the wastewater tank 1 is lowered, and the position of the stop water level detection sensor 7 is lowered. When the water level reaches, the water level is detected by the stop water level detection sensor 7 and the operation of the grinder pump 2 is controlled by the stop command from the pump unit control section 11 based on the detection signal.

Further, the water level of the sewage is detected by the abnormal water level detection sensor 9
When the position is reached, notify each house 3 with an alarm etc.,
It is controlled to promote the regulation of wastewater drainage.

Further, in order to monitor and control the operating state of each grinder pump 2, each pump unit control section 11 is connected to a monitoring control section 12 including a monitoring control panel,
The monitoring control unit 12 takes in detection signal information from each of the sensors 7, 8 and 9 and information as to whether or not the grinder pump 2 is in operation, and also confirms that one of the signals has turned from OFF to ON and from ON to OFF. It is configured to monitor and determine whether or not each grinder pump 2 can be operated each time there is a change in the signal, and transfer a command corresponding to the pump unit controller 11 of each pump unit GP1, GP2, ... GPn.

In addition, the monitoring control unit 12 includes each of the pipelines P1,
For each P2, ... Pn, the permissible simultaneous operation number of the grinder pumps 2 of the pump units GP1, GP2 ,. For example, the pipeline P1 has one allowable simultaneous operation number of the grinder pump 2, the pipeline P2 has one allowable simultaneous operation number of the grinder pump 2, and the pipeline P3 has one allowable simultaneous operation number of the grinder pump 2. The pipeline P4 has one allowable simultaneous operation number of the grinder pump 2, the pipeline P5 has two allowable simultaneous operation numbers of the grinder pump 2, and the pipeline P6 has one allowable simultaneous operation number of the grinder pump 2. P7 is set such that the number of grinder pumps 2 allowed to operate simultaneously is three.

Then, the monitor control unit 12 receives the respective pipelines P1, P2, ...
Information on the number of operating grinder pumps 2 corresponding to Pn and each of the pipelines P1, P2, ... Pn grinder pump 2
If the allowable number of simultaneous operation is not exceeded, the corresponding pump units GP1, G
The information indicating that the grinder pump 2 can be operated is transferred to the pump unit control units 11 of P2, ..., GPn, and the grinder pump 2 is activated based on the operation command from the pump unit control unit 11, and the sensors 7, Based on the detection signals of 8 and 9, the operation of each grinder pump 2 is stopped by each pump unit controller 11.

On the contrary, information on the number of operating grinder pumps 2 corresponding to each of the pipelines P1, P2, ... Pn fetched from each pump unit control section 11 and each pipeline P1, Pn.
2. Compare the permissible simultaneous operation number of the grinder pump 2 for each Pn, and if the permissible simultaneous operation number is exceeded,
Information on whether or not the grinder pump 2 is operating, that is, a standby signal as a standby command is output to the pump unit controller 11 of the corresponding pump units GP1, GP2, ... GPn. The pump unit controller 11 to which this standby signal is input interrupts the operation command to the grinder pump 2, and here,
Grinder pump 2 trying to exceed the allowable number of simultaneous operation
Is controlled so that the operation of is put in a standby state.

By the way, the washing time, bathing time, cooking time, etc. in each household are almost stable every day.
As shown in Figure 1, in the area where the pressure type sewer system is generally installed, the pipeline P from each home in one day
1, P2, ... Pn net change in sewage flow rate is almost stable every day. For example, in FIG. 4, T1 and T2 are 1
This is the so-called sewage volume rush hour, where daily sewage discharges concentrate.

Next, the control operation will be described based on the flow chart shown in FIG.

When there is a change in the signals of the sensors 7, 8, 9, etc., the monitor control unit 12 operates, and in step S1, the allowable number of simultaneously operating grinder pumps 2 for each of the pipelines P1, P2, ... Pn. The difference (L = J−K) between J and the operating number K of the grinder pumps 2 corresponding to each of the pipelines P1, P2, ... Pn fetched from each pump unit controller 11 is obtained.

Then, the process proceeds to step S2, where the difference L
Is determined to be 0 or more, and if the difference L is 0 or more, the process proceeds to step S3, and the grinder pump 2 is operated / stopped based on each pump unit controller 11. For example, in the normal time zone in which the wastewater discharge amount is not concentrated, other than the wastewater volume rush time zones T1 and T2 in FIG.
The operating number K of the grinder pumps 2 corresponding to the respective pipelines P1, P2, ... Pn hardly exceeds the allowable simultaneous operating number J of the pipelines P1, P2 ,. When the amount of sewage flowing into each sewage tank 1 from the house 3 reaches the starting water level HWL position, the water level is detected by the starting water level detection sensor 8, and the grinder is operated by the operation command from the pump unit control unit 11 based on the detection signal. The pump 2 is started up. Then, by operating the grinder pump 2, the sewage in the sewage tank 1 is transferred to the pipelines P1, P
When the water level of the sewage in the sewage tank 1 drops to the stop water level LWL position after being discharged to Pn, the water level is detected by the stop water level detection sensor 7, and the pump unit control is performed based on the detection signal. The operation of the grinder pump 2 is stopped by the stop command from the section 11.

If it is determined in step S2 that the difference L is less than 0, the process proceeds to step S4, in which the corresponding pump unit control is performed to stop the grinder pump 2 which is going to be started over the allowable simultaneous operation number J. A standby command is output to the section 11. At this point, the operation of the corresponding grinder pump 2 is put in a standby state. For example, the sewage amount rush hours T1 and T2 in FIG. 4 where the sewage discharge amount is concentrated.
, The operating number K of the grinder pumps 2 corresponding to each of the pipelines P1, P2, ...
.. In some cases, the allowable number of simultaneous operation J in Pn may be exceeded, and in this case, the monitoring control unit 12 outputs a standby signal to the corresponding pump unit control unit 11 to try to exceed the allowable number of simultaneous operation J. The operation of the grinder pump 2 is put in a standby state.

After that, returning to step S1, when the operating number K of the grinder pumps 2 decreases, the process proceeds to step S2 and step S3 in sequence, and each pump unit control section 11
Based on this, the grinder pump 2 is controlled to be started / stopped.
That is, the grinder pump 2 that has been in the standby state is started. When there are a plurality of grinder pumps 2 in the standby state, the priority order may be set in advance and the operation may be sequentially started in accordance with the priority order.

The embodiment of the present invention is configured as described above, and the sewage amount rush time zone T in which the sewage discharge amount is concentrated.
1, T2, etc., the operating number K of the grinder pumps 2 corresponding to the respective pipelines P1, P2, ...
When the allowable number of simultaneous operation J in 1, P2, ..., Pn is exceeded, the monitoring control unit 12 outputs a standby signal and waits for the operation of the grinder pump 2 to exceed the allowable number of simultaneous operation J. Is controlled to Here, the operating number K of the grinder pumps 2 in each of the pipelines P1, P2, ... Pn can be suppressed within the allowable simultaneous operating number J, and the overload operation of the motor that drives the grinder pumps 2 can be effectively prevented. , Each pipeline P1, P2, ... P
The sewage can be efficiently pumped according to n.

[0037]

As described above, according to the pressure type sewer system of the present invention, the water level detection for detecting the starting water level and the stopping water level of the amount of the wastewater that is temporarily stored by flowing into each wastewater tank from each wastewater discharge source. Each of the sensors includes a pump unit controller that controls the operation of each pump according to a detection signal from the water level detection sensor, and a monitor controller that monitors and controls the operating state of each pump. The department compares the number of operating pumps corresponding to each pipeline with the preset number of allowable simultaneous operating pumps that can be operated simultaneously for each pipeline. A standby signal is output to put the operation into a standby state, and the number of pumps operating in each pipeline can be kept within the allowable number of simultaneous operations, and pump overload operation can be effectively prevented. It can be advantageously pumped efficiently sewage in accordance with each line.

[Brief description of drawings]

FIG. 1 is a flowchart according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of a pressure type sewer system according to an embodiment of the present invention.

FIG. 3 is a schematic explanatory diagram of a pressure type sewer system according to an embodiment of the present invention.

FIG. 4 is a diagram showing the relationship between time and the inflow of sewage.

[Explanation of symbols]

 1 Sewage tank 2 Grinder pump 3 House 4 Inflow pipe 5 Discharge pipe 7 Stop water level detection sensor 8 Start water level detection sensor 9 Abnormal water level detection sensor 11 Pump unit control unit 12 Monitoring control unit GP1, GP2, ... GPn Pump unit P1, P2 ··· Pn pipelines T1, T2 sewage volume rush hours

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeo Kondo 1-1-1 Shinmeiwacho, Takarazuka-shi, Hyogo Shinmeiwa Industry Co., Ltd. Industrial Machinery Division

Claims (1)

[Claims] 1. A pressure sewer system for pumping sewage to a treatment plant by a plurality of pump units having a pump for pumping sewage that has flowed into a sewage tank and a pipeline network connecting between the pump units, Each of the wastewater discharge sources is equipped with a water level detection sensor that detects the starting water level and the stop water level of the amount of wastewater that temporarily flows into each wastewater tank, and operates each pump according to the detection signal from the water level detection sensor. Each pump unit control unit for stop control and a monitoring control unit for monitoring and controlling the operating state of each pump are provided, and the monitoring control unit is preset for each operating number of pumps corresponding to each pipeline and each pipeline. The maximum number of pumps that can be operated simultaneously is compared with the maximum number of pumps that can be operated simultaneously. Pressure sewer system characterized and.