JP2592647B2 - Pressure type sewer system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressure type sewerage system for pumping sewage from a plurality of sewage pumping units to one sewage pumping main pipe.

(Prior Art) In a pressure type sewer system in which sewage is pumped from a plurality of sewage pumping units in which sewage pumps are arranged to one sewage pumping main pipe, the pipe diameter of the sewage pumping main pipe is determined by a plurality of sewage pumping units. May be determined based on the amount of sewage pumped to the sewage main pipe when all the pumps are operated.

The plurality of sewage pumping units generally include a storage tank for temporarily storing sewage flowing down from a sewage generation source, and a sewage disposed in the storage tank and pumping sewage stored in the storage tank to a sewage pressure main pipe. Pump. Then, when the water level of the sewage flowing down to the water storage tank reaches the operation start water level, this water level is detected and the operation of the pump is started to pump the sewage of the water storage tank to the sewage pressure main pipe.

The operation of the pump continues until the water level drops to the stop water level of the pump.If a large amount of sewage exceeding the capacity of the pump flows into the storage tank and the water level reaches the maximum alarm water level, Issued an alarm to limit the sewage flow to the sewage pumping unit.

(Problems to be Solved by the Invention) By the way, in an area where a large amount of sewage flows down, such as a building area (office area), the frequency of use of a sewage generation source, particularly during a lunchtime or a closing time in the daytime. During high rush hours, the amount of sewage flowing down to the sewage pumping unit significantly increases, and the water level in the water storage tank reaches the operation start water level in a relatively short time.

Therefore, in the conventional system in which the pumps are continuously operated from the time when the water level of the sewage pumping unit reaches the operation start water level to the time when the water level drops to the operation stop water level, almost all pumps are simultaneously operated during the rush hour. An operating rush will occur and a large amount of sewage will be pumped to the sewage main at the same time. Therefore, the pipe diameter of the sewage main pipe becomes large, which is a factor of increasing construction cost of sewage facilities.

The present invention has been made in view of such circumstances, and the frequency of simultaneous use of a sewage generation source is high. It is an object of the present invention to provide a pressure-type sewer system capable of suppressing the amount of sewage to be discharged and reducing the diameter of a sewage pressure main pipe.

(Means for Solving the Problems) A first invention for achieving the above object is an operation rush time of a pump arranged in each of a plurality of sewage pumping units for pumping sewage to one sewage pumping main pipe. In this operation rush hour zone, the water level of each of the sewage pumping units is detected, and the pump of the sewage pumping unit whose detected water level is equal to or higher than the preset operation start water level is started. Pumping the sewage to the sewage pumping main pipe, and after a lapse of a predetermined time from the start of pump operation, detecting the water level of the sewage pumping unit in which the pump that is operating at that time is disposed and comparing the detected water level with the operation start water level, When the comparison water level is equal to or higher than the operation start water level, the operation of the operating pump is continued, and when the comparison water level is lower than the operation start water level, the operation of the pump is stopped. That's what I did.

In addition, a second invention for achieving the above object is to set in advance the allowable number of operating pumps arranged in each of a plurality of sewage pumping units for pumping sewage to one sewage pumping main pipe, Detecting the water level of each of the sewage pumping units, respectively, and starts operating the pump of the sewage pumping unit whose detected water level is equal to or higher than a preset operation start water level to pump sewage to the sewage pumping main pipe, When the actual number of pumps that have been started in this way exceeds the allowable number of pumps, the water level of the sewage pumping unit in which the pump that is operating at that time is disposed is detected and compared with the operation start water level. When the comparison water level is lower than the operation start water level, the operation of the pump of the corresponding sewage pumping unit is stopped.

(Operation) According to the first aspect of the present invention, in a preset pump operation rush hour, after a predetermined time has elapsed from the start of the pump operation, the sewage pumping in which the pump being operated at that time is disposed. The water level of the unit is detected and compared with a preset operation start level.If the comparative level is equal to or higher than the operation start level, the operation of the pump is continued, but if the comparative level is lower than the operation start level, the pump is operated. , The pump is stopped after a lapse of a predetermined time from the start of pump operation, and a sewage pumping unit that does not pump sewage to the sewage pumping main pipe appears. And the diameter of the sewage main pipe can be reduced.

Further, according to the second aspect, the actual number of pumps started to operate with the water level of each sewage pumping unit being equal to or higher than the preset operation start water level exceeds the preset allowable operation number. At this time, the water level of the sewage pumping unit in which the operating pump is located at that time is detected and compared with the operation start water level, and the operation of the pump of the sewage pumping unit whose comparison water level is lower than the operation start water level is stopped. Thus, after a situation in which the sewage is pumped from a plurality of sewage pumping units to one sewage pumping main pipe, the pump is stopped and a sewage pumping unit that does not pump sewage to the sewage pumping main pipe appears. Thus, the operation rush of the pump can be reduced, and the pipe diameter of the sewage pressure main pipe can be set small.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic system diagram showing an embodiment of the first invention according to the present invention. A plurality of sewage pumping units 2a to 2n are connected to one sewage pumping main pipe 1 by branching. The sewage is pumped from the units 2a to 2n to the sewage pressure main pipe 1. Then, sewage flows from a plurality of sewage generation sources (not shown) into each of the sewage pumping units 2a to 2n.

As shown in FIG. 2, the sewage pumping units 2a to 2n each include a water storage tank 21 and a pump 22 arranged in the water storage tank 21. Flows in and is stored. And usually, the water tank 21
When the water level reaches the operation start water level WH ₀ , the operation start water level signal output from the water level detector 4 that detects this water level is input to the control means 5, and the operation start signal output from the control means 5 The pump 22 starts operating based on the discharge pipe
The sewage in the water storage tank 21 is pumped to the sewage pumping main pipe 1 through 22A. In addition, the water level is stopped by the operation of the pump 22.
When dropped to WH _L, operation stop level signal detected by the water level detector 4 is input to the control unit 5 stops the operation of the pump 22 based on the operation stop signal outputted from the control means 5. The amount of sewage flowing into the water storage tank 21 is
Beyond the capacity, thus the alarm level signal detected by the water level detector 4 is input to the control unit 5 when the water level reaches the alarm level WH _h, alarm 6 on the basis of the alarm signal output from here To regulate the use of sewage sources.

Reference numeral 7 denotes a timer for setting an operation rush time zone of the pump 22 disposed in each of the sewage pumping units 2a to 2n. The timer 7 is electrically connected to the water level detector 4 and the control means 5, respectively. Connected.

Next, the frequency of use of the sewage source during the operation rush hours of the pump 22, for example, in an area with a large amount of sewage flow such as a building area (office area), particularly during a break time in the daytime or a closing time. The operation at the time of a high rush will be described with reference to the flowchart shown in FIG. In the drawing, P ₁ to P ₉
Indicates each control step.

Reaches the set time period by the timer 7 starts first with P _1, the water level in the water tank 21 of the lower pressure feed unit 2a~2n is determined is less than or whether operation start level WHO more than P _2, the water level starts operation the pump 22 proceeds to P ₃ is less than the water level WHO kept stopped. And if the water level is higher than the operation start water level WHO, P
Proceed to ₄ to operate the pump 22.

When the pump 22 is operated at P _4, the process proceeds to P ₆ after the timer time (not shown) is operated to be set in the timer t has elapsed proceeds to P _5, the herein by the water level detector 4 The water level of the water storage tank 21 at the time is detected. When the water level is detected in P ₆ proceeds to P _7, wherein the operation start level
Or less or more than the WHO is determined, the water level is the pump 22 is stopped proceeds to P ₈ is less than the operation start level WHO returns to P _2. At this time, the timer of the P ₅ is reset. Also, P ₇
Continued operation of the pump 22 proceeds to P ₉ when the water level is determined to be the operation start level WHO or in, which returns to P _2, such operation set time period of the timer 7 Is repeated in At this time, the timer of the P ₅ is reset.

Therefore, the water level is once set to the operation start water level WH
If the water level reaches O, the operation of the pump 22 is not continued until the water level drops to the operation stop water level WHL.After the operation of the pump 22 starts, the water level detected after a predetermined time elapses. If the operation start water level is lower than WHO, the operation of the pump 22 is stopped, so that a sewage pumping unit that does not pump sewage to the sewage pumping main pipe 1 appears during the operation rush hour of the pump 22 set by the timer 7. Will be. Therefore, the operation rush is alleviated and the amount of sewage pumped simultaneously to the sewage pressure main pipe 1 can be reduced, so that the pipe diameter of the sewage pressure main pipe 1 can be set small.

FIG. 4 is a schematic system diagram showing an embodiment of the second invention according to the present invention, and the same or corresponding parts as those of the first invention are denoted by the same reference numerals.

In FIG. 4, the actual number of operating pumps 22 arranged in each of the plurality of sewage pumping units 2a to 2n is measured by a counter 8, and a measurement signal of the actual number of operating pumps output from the counter 8 is compared with a comparator 9. , And a signal indicating a preset allowable number of pumps to be operated is input to the other input terminal of the comparator 9.
Then, the actual number of pumps operated by the two signals input to the comparator 9 is compared with the allowable number of pumps, and when the actual number of pumps exceeds the allowable number, the pump 22 that is operating at that time is arranged. Means 10 which detects the water level of the sewage pumping units 2a to 2n by the water level detector 4 and compares the water level with the operation start water level WHO to determine whether or not the comparison water level is equal to or higher than the operation start water level WHO. Sewage pumping units 2a to 2 that are determined to be below the operation start water level WHO
The determination signal of n is output to the control means 5, from which an operation stop signal is output to the corresponding pump 22, the pump 22 is stopped and the sewage pumping unit 2 having a water level lower than the operation start water level WHO.
The sewage pumping to the sewage pumping main pipe 1 is stopped from any of a to 2n. Therefore, also in the second invention, when the number of pumps 22 exceeding the preset allowable number of operation of the pumps 22 is actually operated, for example, at the time of the operation rush of the pumps 22, at that time, The water level of the sewage pumping units 2a to 2n where the pump is operating is detected, and the sewage pumping unit whose water level is lower than the operation start water level
Since the operation of the pumps 22 arranged in 2a to 2n is stopped, a sewage pumping unit which does not pump sewage to the sewage pumping main pipe 1 appears. Therefore, the operation rush is alleviated, and the amount of sewage simultaneously pumped to the sewage main pipe 1 can be reduced, so that the pipe diameter of the sewage main pipe 1 can be set small.

(Effects of the Invention) As described above, according to the first aspect of the present invention, the pump is operated at a predetermined time after the elapse of a predetermined time from the start of the pump operation in the preset operation rush time period of the pump. Detecting the water level of the sewage pumping unit in which the pump is disposed, comparing the detected water level with a preset operation start water level, and stopping the operation of the pump of the corresponding sewage pumping unit when the comparison water level is lower than the operation start water level. Therefore, a sewage pumping unit that does not pump sewage to the sewage main pipe during the pump operation rush hour will appear, so that the pump rush is alleviated and the pump is simultaneously pumped to the sewage main pipe. Sewage volume as much as possible, and the diameter of the sewage pressure main pipe can be set smaller by that amount, thereby achieving lower sewage facility construction costs. be able to.

Further, according to the second aspect of the present invention, the actual number of pumps that have been started to operate when the water level of each sewage pumping unit is equal to or higher than a predetermined operation start water level is set to a preset allowable operation number. When it exceeds, the water level of the sewage pumping unit in which the pump operating at that time is arranged is detected and compared with the operation start water level, and the operation of the pump of the sewage pumping unit whose comparison water level is lower than the operation start water level is determined. Since the pump is stopped, the pump is stopped after a situation where the sewage is pumped from a plurality of sewage pumping units to one sewage pumping main pipe, and the sewage pumping unit that does not pump sewage to the sewage pumping main pipe is used. Therefore, the operation rush of the pump is alleviated, the amount of sewage pumped simultaneously to the sewage main pipe is reduced as much as possible, and the pipe diameter of the sewage main pipe is reduced accordingly. It is possible to fence set, as in the first invention, an effect that it is possible to achieve a reduction of the sewage facility construction costs.

[Brief description of the drawings]

1 is a schematic system diagram showing an embodiment of the first invention according to the present invention, FIG. 2 is a schematic sectional view showing an example of a sewage pumping unit, FIG. 3 is a flowchart, and FIG. 1 is a schematic system diagram showing an embodiment of the second invention. DESCRIPTION OF SYMBOLS 1 ... Sewage pressure main pipe 2a-2n ... Sewage pressure sending unit 4 ... Water level detector 7 ... Rush time zone setting timer 10 ... Pump operating number judgment means 22 ... Pump

Claims (2)

(57) [Claims] In a pressure type sewer system for pumping sewage from a plurality of sewage pumping units to one sewage pumping main pipe, an operation rush time zone of a pump disposed in each of the plurality of sewage pumping units is preset. In the operation rush hour, the water level of each of the sewage pumping units is detected, and the pump of the sewage pumping unit whose detected water level is equal to or higher than a preset operation start water level is started to discharge the sewage. The pump is pumped to the sewage main pipe, and after a lapse of a predetermined time from the start of the pump operation, the water level of the sewage pumping unit in which the operating pump is disposed at that time is detected and compared with the operation start water level. When the water level is equal to or higher than the operation start water level, the operation of the pump during operation is continued, and when the comparative water level is lower than the operation start water level, the operation of the pump is stopped. Pressure sewer system being characterized in that so as to. 2. In a pressure type sewer system for pumping sewage from a plurality of sewage pumping units to one sewage pumping main pipe, an allowable operation number of pumps arranged in each of the plurality of sewage pumping units is set in advance. In advance, the water level of each of the sewage pumping units is detected, and the detected water level is higher than or equal to a preset operation start water level, the pump of the sewage pumping unit is started to operate, and sewage is sent to the sewage main pipe. When the actual number of pumps operated in this way exceeds the permissible number of operating pumps, the water level of the sewage pumping unit in which the pumps that are operating at that time are arranged is detected to start the operation. A pressure type wherein the operation of the pump of the corresponding sewage pumping unit is stopped when the comparison water level is lower than the operation start water level. Water supply system.