JPH0718728A - Operation method for manhole pump - Google Patents

Abstract

PURPOSE:To provide a method wherein scums floating on and near the surface of the water or foreign matters such as sludge precipitated to the bottom are smoothly discharged together with waste water so that bad smell is eliminated and a manhole pump is normally operated by normal actions of a water level sensing means, while failures of the manhole pump due to the clogging thereof is avoided. CONSTITUTION:A water-level sensing means 11 senses a state wherein the water level in a manhole body 1 has reached an operation start water level HWL of a manhole pump 10. Based on a signal of sensing of the water level HWL, a start signal is outputted to the pump 10 to actuate it and at the same time a solenoid valve (shut-off operation means) 13 provided in a drainage pipe 8 is closed to perform a shut-off operation. After the lapse of a predetermined time period, the valve 13 is opened to perform a pumping operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a manhole pump.

[0002]

2. Description of the Related Art As shown in FIG. 2, a cylindrical manhole body 1 is placed on a bottom 2 with only an upper opening 1A thereof exposed on the surface of the earth, and the bottom 2 lowers the lower end of the manhole body 1. It is watertightly closed and penetrates the peripheral wall of the manhole body 1 to connect the sewage inflow pipe 3. On the other hand, the bottom 2
Of the discharge curved pipe 4 installed on the upper surface of the central part of the pump, the pumping pipe 5 extending upward to the outlet of the discharge curved pipe 4, the check valve 6 connected to the upper end of the pumping pipe 5, the check valve 6 The header pipe 7 connected to the outlet and the drain pipe 8 penetrating the peripheral wall of the manhole body 1 and connected to the header pipe 7 constitute the discharge system 9, and the discharge system 9 is located at the most upstream part, that is, the discharge curve. In the manhole pump unit in which the discharge pipe 10A of the manhole pump 10 is detachably connected to the pipe 4, the water level in the manhole main body 1 is generally the operation start water level HWL.
If it rises to this level, this state is detected by the water level detection means 11 composed of a float type water level gauge,
This operation start water level signal is input to the control means 12, and an activation signal is output from the control means 12 to the manhole pump 10 based on the input operation start water level signal for activation, and the water level in the manhole body 1 is operated. Stop water level LW
When the water level is lowered to L, this state is detected by the water level detection means 11, this operation stop water level signal is input to the control means 12, and the control means 12 stops the manhole pump 10 based on the input operation stop water level signal. A signal is output to control the operation so as to stop the manhole pump 10.

However, in such a conventional driving method,
Foreign matter such as scum floating on the surface of water near the manhole pump 10 and sludge settling and accumulated on the bottom 2 immediately below and near the suction port 10A can be sucked and discharged together with the sewage, but separated from the manhole pump 10. Foreign matter such as scum floating in the position and sludge settling on the bottom 2 away from directly below the suction port 10A cannot be sucked and discharged together with the dirty water. As a result, a large amount of residual foreign matter such as scum and sludge accumulates over time, giving off an unpleasant odor and causing an unpleasant sensation. In addition, the float-type water level gauge 12 malfunctions, and the manhole pump 10 is operated properly. A harmful effect occurs. Also,
If a large amount of accumulated foreign matter such as scum and sludge is suddenly sucked through the suction port 10B, the manhole pump 10 is clogged, which causes a failure.

[0004]

The problems to be solved are scum floating at a position away from the pump,
Foreign matter such as sludge settling at the bottom away from just below the suction port remains and accumulates in large quantities over time, giving off a bad odor and giving an unpleasant feeling, as well as causing malfunction of the water level gauge,
It is a point that the proper operation of the manhole pump is hindered, or the manhole pump is clogged with the manhole pump and the manhole pump is clogged to cause a failure.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a manhole pump whose operation is controlled based on a water level signal in the manhole body, which is output from a water level detecting means. In the operating method, the water level in the manhole main body is detected by the water level detection means to a state where the water level has risen to the operation start water level of the manhole pump, and a start signal is output to the manhole pump based on the detected operation start water level signal, and the manhole pump The shut-off operation means provided in the discharge system is closed to perform the cut-off operation, and after a lapse of a predetermined time, the cut-off of the cut-off operation means is released to perform the pumping operation, and the scum floating on and near the water surface. Smoothly drain foreign matter such as sludge that has settled to the bottom with the sewage,
The object of eliminating the bad smell, operating the manhole pump properly by the normal operation of the water level detecting means, and preventing the failure due to the clogging of the manhole pump was achieved.

[0006]

According to the present invention, when the water level in the manhole main body rises to the operation start water level of the manhole pump, this state is detected by the water level detection means, and a start signal is sent to the manhole pump based on the detected operation start water level signal. Is output. At the same time, a deadline signal is output to the deadline operating means provided in the discharge system of the manhole pump to shut off the deadline operating means. As a result, the manhole pump is shut off. By continuing the shutoff operation of the manhole pump, all foreign matter such as scum floating on the water surface in the manhole body and its vicinity and sludge settling at the bottom is forcibly stirred together with the sewage, and these foreign matter are Is almost evenly mixed in the wastewater. By releasing the deadline of the deadline operation means after a lapse of a predetermined time and switching to the pumping operation, it is possible to suck in the foreign matter mixed almost uniformly in the dirty water together with the dirty water and smoothly discharge it.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. It should be noted that the same or corresponding parts as those of the conventional example of FIG. In FIG. 1, a manhole pump unit is placed on a bottom portion 2 with only an upper opening 1A of a cylindrical manhole body portion 1 exposed to the ground surface, and the bottom portion 2 watertightly closes the lower end of the manhole body portion 1. In addition, the sewage inflow pipe 3 is connected through the peripheral wall of the manhole body 1 and the discharge curved pipe 4 is installed on the upper surface of the central portion of the invert 2. The discharge curved pipe 4 has a discharge pipe 10A of the manhole pump 10. Is connected detachably, and a pumping pipe 5 extending upward is connected to the outlet of the discharge curved pipe 4, and the upper end of the pumping pipe 5 is connected to the discharge header pipe 7 through a check valve 6, 7 has a structure in which a drainage pipe 8 is connected through the peripheral wall of the manhole main body 1, and a discharge system 9 includes a discharge bend pipe 4, a pumping pipe 5, a check valve 6, a header pipe 7 and a drainage pipe 8. Are configured.

On the other hand, the drain pipe 8 is provided with a shut-off operating means 13 which is, for example, an electric valve, and the water level detection signal detected by the water level detecting means 11 which is a float type water level gauge is provided with a timer 12A. The control means 12 is input to the manhole pump 10 and the deadline operation means 13 based on the water level detection signal.
Is configured to output a control signal.

With this structure, the water level in the manhole body 1 is the operation start water level H of the manhole pump 10.
When rising to WL, this state is detected by the water level detection means 11, and the operation start water level signal is input to the control means 12. The control means 12 excites the timer 12A, outputs an operation start signal to the manhole pump 10 to start the manhole pump 10, and the deadline operation means 1
A shutoff signal is output to 3 to shut off the shutoff operating means 13 (close the motor operated valve). As a result, the manhole pump 10 is shut off. By continuing the shut-off operation of the manhole pump 10 until the excitation of the timer 12A is released, the water surface HWL in the manhole body 1 and the scum floating around the water surface HWL and the bottom 2 are settling. All foreign substances such as sludge are forcibly stirred together with the sewage, and these foreign substances are almost evenly mixed in the sewage.

When the excitation of the timer 12A is released, a deadline release signal is output from the control means 12 to the deadline operation means 13, and the deadline of the deadline operation means 13 is released (the motor operated valve is opened). As a result, the manhole pump 10 is switched to the pumping operation, and the foreign matter mixed in the wastewater almost uniformly can be smoothly discharged together with the wastewater.

Therefore, as in the prior art, scum floating at a position away from the manhole pump 10 and foreign matter such as sludge settling at the bottom 2 away from immediately below the suction port 10B remain and a large amount is accumulated over time. Will not be deposited on. Therefore, the bad smell can be eliminated, the water level detecting means 11 can be normally operated, and the manhole pump 10 can be properly operated according to the water level, and a large amount of foreign matter such as scum and sludge can be rapidly sucked into the suction port. Since it is no longer sucked from 10B, it is possible to reliably prevent a failure due to clogging of the manhole pump 10.

By continuing the pumping operation of the manhole pump 10, the water level in the manhole main body 1 is changed to the manhole pump 1.
When the operation stop water level LWL is reduced to 0, this state is detected by the water level detection means 11, and the operation stop water level signal is input to the control means 12. The control means 12 outputs a stop signal to the manhole pump 10 based on the input operation stop water level signal to stop the manhole pump 10.

In the above-described embodiment, the drain pipe 8 is provided with the shutoff operating means 13, but the shutoff operating means 13 is provided at any one selected from the pumping pipe 5 and the header pipe 7. You may. Further, the deadline operation means 13 may be constituted by an electromagnetic valve instead of the motor operated valve.

[0014]

As described above, according to the present invention, the shut-off operation is continued for a predetermined time in the initial stage of starting the manhole pump, and the scum floating on and near the water surface in the manhole main body and the sedimentation at the bottom. Forcibly stirring all foreign matter such as sludge with sewage, mixing these foreign matters almost evenly in the sewage, then opening the deadline operation means and switching to pumping operation Since the foreign substances that are mixed evenly are discharged smoothly together with the sewage, the scum floating at a position away from the manhole pump or settling to the bottom away from just below the suction port as in the past Foreign matter, such as sludge, does not remain and accumulate in large quantities over time. Therefore, it is possible to eliminate the bad odor, operate the water level detection device normally, and operate the manhole pump properly according to the water level, and also abundantly accumulated foreign matter such as scum and sludge from the suction port. Since it will not be rare, failure due to clogging of the manhole pump can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 1 Manhole main body 9 Discharge system 10 Manhole pump 11 Water level detection means 13 Motorized valve (deadline operation means) HWL Operation start water level

Claims (1)

[Claims] 1. A method of operating a manhole pump, wherein the manhole pump installed inside the manhole body is controlled based on a water level signal in the manhole body output from a water level detecting means. A state in which the water level has risen to the operation start water level of the manhole pump is detected by the water level detection means, and a start signal is output to the manhole pump based on the detected operation start water level signal, and it is provided in the discharge system of the manhole pump. A method of operating a manhole pump, comprising: performing a shutoff operation by shutting off a certain shutoff operating means, and releasing a shutoff of the shutoff operating means after a predetermined time, and performing a pumping operation.