Device for displaying remaining operation time of main pump apparatus in drainage pumping station, and driving system of main pump apparatus

Abstract

To provide a device for displaying a remaining operation time which outputs a residual operation possible time of an internal combustion engine for driving a main pump device in a drainage pumping station with a simple constitution.SOLUTION: A display device is connected to a driving part for driving at least one main pump device by using at least one internal combustion engine and a fuel supply part for supplying fuel to the driving part, and displays a remaining operation time of the internal combustion engine. The display device includes: a first input / output part which is connected to at least one fuel flow meter for measuring a flow rate of fuel supplied to the internal combustion engine, and outputs a first analog signal indicating the fuel flow rate to the internal combustion engine; a second input / output part which is connected to at least one remaining fuel measuring instrument for measuring a remaining fuel amount in the fuel supply part, and outputs a second analog signal indicating the remaining fuel amount; an analog divider to which the first analog signal and the second analog signal are inputted and which outputs a third analog signal indicating the remaining operation time of the internal combustion engine; and a display unit into which the third analog signal is inputted and which displays information indicating the remaining operation time of the internal combustion engine.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a display device for displaying the remaining operating time of an internal combustion engine including a main pump unit installed in a drainage pumping station, and a drive system for the main pump unit using the display device. [Background technology]

[0002] In drainage pumping stations that use a main pump unit powered by an internal combustion engine to discharge water, calculating the remaining operating time of the main pump unit and visualizing the calculation results is useful for maintaining and managing the pumping station and for operators to understand the operating status.

[0003] The remaining operable time of the main pump unit can be calculated from the remaining fuel amount and fuel consumption amount of the drainage pumping station. For example, in the technology described in Patent Document 1, an average fuel consumption value is calculated from the integrated value of the engine fuel injection amount stored in a storage device, and the remaining fuel amount detected by a fuel sensor is divided by the average fuel consumption value to calculate the remaining operable time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-37112 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology described in Patent Document 1 requires equipment such as a storage device and a computing device to calculate the remaining operable time, and certain costs are incurred for introducing and maintaining the equipment. Patent Document 1 is a technology for calculating the operating time of a work vehicle whose output is prone to fluctuation, and while it is necessary to quickly calculate the average fuel consumption value, fluctuations in the output (and average fuel consumption) of the main pump device at a drainage pumping station are small, and there is relatively little need to quickly calculate the remaining operable time, so equipment such as a storage device and a computing device are not necessarily required.

[0006] The present invention has been made in consideration of the above, and aims to provide a device that has a simple configuration and is capable of outputting the remaining operating time of an internal combustion engine that drives a main pump device in a drainage pumping station, and a drive system for the main pump device using said device. [Means for solving the problem]

[0007] In view of the above, one aspect of the present invention is a display device connected to a drive unit that drives at least one main pump device using at least one internal combustion engine and a fuel supply unit that supplies fuel to the drive unit, the display device displaying a remaining operating time of the internal combustion engine, The device has a configuration including: a first input / output unit connected to at least one fuel flow meter that measures the fuel flow rate supplied to the internal combustion engine and that outputs a first analog signal indicating the fuel flow rate to the internal combustion engine; a second input / output unit connected to at least one remaining fuel measuring device that measures the amount of remaining fuel in the fuel supply unit and that outputs a second analog signal that indicates the amount of remaining fuel; an analog divider that receives the first analog signal and the second analog signal and outputs a third analog signal that indicates the remaining operating time of the internal combustion engine; and a display that receives the third analog signal and that displays information that indicates the remaining operating time of the internal combustion engine.

[0008] In the above configuration, the first input / output unit is an analog adder connected to a plurality of the fuel flow meters corresponding to a plurality of internal combustion engines, and outputs the first analog signal by adding up analog signals from the plurality of fuel flow meters, and the second input / output unit is an analog adder connected to a plurality of the remaining fuel measuring devices corresponding to a plurality of fuel reservoirs constituting the fuel supply unit, and outputs the second analog signal by adding up analog signals from the plurality of the remaining fuel measuring devices.

[0009] The above configuration further comprises an analog signal output device that outputs a fourth analog signal that indicates a set value of the fuel flow rate to the internal combustion engine, and a switch that switches the connection of the analog signal divider to either the first input / output unit or the analog signal output device, and is configured such that the switch is switched to the analog signal output device side when the internal combustion engine is stopped.

[0010] The device further includes an output device that outputs an indication when the third analog signal output by the analog divider falls below a predetermined value.

[0011] Another aspect of the present invention is a drive system for a main pump device, comprising a remaining operating time display device having the above-mentioned configuration, an internal combustion engine that drives at least one main pump device, and a fuel supply unit that supplies fuel to the internal combustion engine. [Effects of the Invention]

[0012] According to the present invention, it is possible to output the remaining operable time of the internal combustion engine that drives the main pump device in a drainage pumping station with a simple configuration. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a system configuration diagram showing an embodiment of a drive system for a main pump device equipped with a remaining operation time display device in a drainage pumping station. FIG. [Figure 2] FIG. 2 is a diagram schematically illustrating an example of the configuration of a drainage pumping station equipped with the drive system of FIG. 1. [Figure 3] 1 is a graph showing the relationship between the discharge rate of the main pump unit and the total head and shaft power. [Figure 4] 2 is a diagram illustrating the operation of the remaining operating time display device of FIG. 1. FIG. [Figure 5] FIG. 10 is a block diagram showing another embodiment of a drive system for a main pump unit equipped with a remaining operating time display. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a system configuration diagram showing one embodiment of a drive system for a main pump unit in a drainage pumping station equipped with a remaining operating time display device for the main pump unit, and Fig. 2 is a diagram showing an example of the configuration of a drainage pumping station equipped with the drive system of Fig. 1. The drive system 10 includes a drive unit 11, a fuel supply unit 12, an on-site panel 13, and an analog signal output device 14. The drive system 10 in this embodiment is installed in, for example, a drainage pumping station and constitutes a drainage system for discharging rainwater that has flowed into a suction inlet from a river into a discharge tank.

[0015] The drive unit 11 includes drivers 23-25 ​​for driving the main pump device 20 and a private power generating facility 22 as an emergency power source, and the private power generating facility 22 and the drivers 23-25 ​​form an internal combustion engine. The private power generating facility 22 and the drivers 23-25 ​​are connected upstream to fuel flow meters 26-29 that measure the flow rate of fuel (fuel consumption) supplied from the fuel supply unit 12, which will be described later. Each of the fuel flow meters 26-29 outputs analog signals q1-q4 (e.g., DC 4-20 mA, 1-5 V signals) corresponding to the measured flow rate, and these analog signals q1-q4 are input to the on-site panel 13, which will be described later.

[0016] 2, each of the main pump units 20 arranged in a pump room 31 in a building 34 is connected to a driver 23 via a reducer 30 arranged in a driver room 32. The suction pipe side of the main pump unit 20 is connected to a suction tank 33, and the main pump unit 20 pumps up liquid (wastewater) stored in the suction tank 33 and sends it out via a discharge pipe to an external discharge tank (not shown).

[0017] The driver 23 is connected to the input shaft of the reducer 30, and the output shaft of the reducer 30 is connected to a main shaft (not shown) inside the main pump device 20. The reducer 30 has a predetermined reduction ratio so that the ratio between the rotation speed of the input shaft and the rotation speed of the output shaft is a predetermined value. When the driver 23 rotates, the rotational force is transmitted to the main shaft inside the main pump device 20 via the reducer 30, causing an impeller (not shown) connected to the main shaft to rotate. As a result, the liquid in the suction tank 33 is guided via the main pump device 20 to an external discharge tank.

[0018] In addition, in this embodiment, the drive unit 11 is configured to have three drive machines 23 to 25, each connected to a main pump device, but the number of drive machines is not limited to three, as long as it is the same number as the main pump devices to which they are connected.

[0019] 1, the fuel supply unit 12 includes a fuel dispense tank 40, a fuel tank 41, a fuel transfer pump 42, and a fuel supply box 43. The fuel dispense tank 40 is connected to the private power generation facility 22 and the drivers 23-25, and supplies fuel to the private power generation facility 22 and the drivers 23-25. The fuel dispense tank 40 is provided with an oil level gauge 44 that measures the liquid level in the tank, and outputs an analog signal Q1 corresponding to the measured liquid level. This analog signal Q1 is a signal corresponding to the amount of fuel remaining in the fuel dispense tank 40, and is input to the on-site panel 13, which will be described later.

[0020] Fuel tank 41 is, for example, an underground fuel tank installed underground, and supplies fuel to fuel dispensing tank 40 via fuel transfer pump 42. When an oil level gauge provided in fuel dispensing tank 40 reaches its lower limit (a predetermined height), fuel transfer pump 42 starts up and fuel in fuel tank 41 is supplied to fuel dispensing tank 40. Fuel tank 41 is also provided with oil level gauge 45 that measures the liquid level in the tank, and outputs analog signal Q2 corresponding to the measured liquid level. This analog signal Q2 is a signal corresponding to the amount of fuel remaining in fuel tank 41, and is input to on-site panel 13, which will be described later.

[0021] The fuel supply box 43 is connected to an external fuel supply means (for example, a tank truck) and supplies fuel to the fuel tank 41. An analog signal Q1 from the fuel dispensing tank 40 and an analog signal Q2 from the fuel tank 41 may be input to the fuel supply box 43, and an analog output device provided in the fuel supply box 43 may output an analog signal to the on-site panel 13, which will be described later.

[0022] The on-site panel 13 clearly displays the driving machines and private power generating equipment that are in operation, as well as their remaining operable time, and is equipped with analog adders 50, 51, an analog divider 52, a remaining operable time indicator 53, an operating machine indicator light 54, a fuel supply lamp 55, and a C contact 56.

[0023] Analog signals (fuel flow rate signals) q1 to q4 from fuel flow meters 26 to 29 corresponding to the private power generation equipment 22 and driving machines 23 to 25, respectively, are input to one analog adder 50, and an analog signal (total fuel flow rate signal) Q3 (= q1 + q2 + q3 + q4) corresponding to their sum is output. Analog signals (remaining fuel amount signals) Q1 and Q2 from fuel level gauges 44 and 45 corresponding to the fuel dispensing tank 40 and fuel tank 41, respectively, are input to the other analog adder 51, and an analog signal (total remaining fuel amount signal) Q4 (= Q1 + Q2) corresponding to their sum is output.

[0024] The analog divider 52 receives the analog signal (total fuel flow rate signal) Q3 from the analog adder 50 and the analog signal (total remaining fuel amount signal) Q4 from the analog adder 51, and outputs an analog signal (remaining operable time signal) corresponding to the value (Q4 / Q3) obtained by dividing the former by the latter. The analog signal (remaining operable time signal) output from the analog divider 52 is input to a remaining operable time display 53, which is an analog meter, and the remaining operable time of the internal combustion engine (private power generation equipment 22 and drive machines 23-25) being driven is displayed in a manner that is visible to the operator.

[0025] Figure 3(a) is a curve (QH curve) that shows the relationship between pump flow rate and total head for each pump specific speed Ns, and Figure 3(b) is a curve (QL curve) that shows the relationship between pump flow rate and shaft power for each pump specific speed Ns. The horizontal axis of the figure is the ratio (Q / Q0) of the actual discharge volume Q to the discharge volume (planned discharge volume) Q0 at the design point, the vertical axis of Figure 3(a) is the ratio (H / H0) of the actual total head H to the total head H0 at the design point, and the vertical axis of Figure 3(b) is the ratio (P / P0) of the actual shaft power P to the shaft power P0 at the design point.

[0026] In drainage pumping stations, pumps with a high specific speed Ns (large-capacity pumps with low head) are generally used. In Figures 3(a) and (b), pumps are generally operated within an operating range of Q / Q0 of approximately 70% to approximately 120%. If the ratio deviates from this range, the pump may generate abnormal vibrations and noise, which may lead to pump failure.

[0027] For example, internal combustion engines of automobiles, etc., do not have a rated output and frequently accelerate and decelerate depending on traffic conditions, so their output constantly fluctuates, and as a result, their fuel consumption also constantly fluctuates. Therefore, it is necessary to calculate the remaining operating time using devices such as memory and a CPU. In contrast, internal combustion engines used to drive drainage pumps have a rated output, and as shown in Figure 3(b), fluctuations in shaft power (i.e., fluctuations in fuel consumption) are small within the above operating range. Therefore, for internal combustion engines used to drive drainage pumps, there is little need to use devices such as memory and a CPU to calculate the remaining operating time, and they are suitable for calculating the remaining operating time using analog calculations.

[0028] 1, the operating unit indicator light 54 has a plurality of indicator lights corresponding to the private power generating equipment 22 and the drivers 23 to 25, and is connected to the private power generating equipment 22 and the drivers 23 to 25 via wiring (not shown). The operating unit indicator light 54 lights up the lamps corresponding to the private power generating equipment 22 and the drivers 23 to 25 that are in operation, to notify the operator of the equipment or driver that is in operation.

[0029] The fuel supply lamp 55 is configured to light up when the analog signal (remaining operable time signal) corresponding to Q4 / Q3 from the analog divider 52 falls below a set value, urging the operator to replenish fuel. Note that an alarm may be provided on the site panel 13 to sound an alarm when the analog signal (remaining operable time signal) corresponding to Q4 / Q3 from the analog divider 52 falls below a set value.

[0030] The C contact 56 is a switch that is switched depending on whether or not all of the internal combustion engines (the private power generation equipment 22 and the driving machines 23 to 25) have stopped. When either the private power generation equipment 22 or the driving machines 23 to 25 are being driven, the C contact is connected at the right contact (the internal combustion engine operating side). On the other hand, when all of the internal combustion engines have stopped, the C contact is connected at the left contact (the internal combustion engine stopped side).

[0031] The analog signal output device 14 outputs an analog signal corresponding to the theoretical fuel flow rate when it is assumed that a certain internal combustion engine is operating when all the internal combustion engines in the drainage pumping station have stopped operating.

[0032] The analog signal output device 14 is equipped with a knob switch 60, which is a rotary selector switch, and can be switched between multiple positions corresponding to the combination of, for example, the driver (No. 1) 23, driver (No. 2) 24, and driver (No. 3) 25 that drive the main pump device. In this embodiment, the knob switch 14 can be switched between eight positions: [1] driver (No. 1) only, [2] driver (No. 1) + driver (No. 2), [3] driver (No. 1) + driver (No. 2) + driver (No. 3), [4] driver (No. 2) only, [5] driver (No. 2) + driver (No. 3), [6] driver (No. 3) only, [7] driver (No. 1) + driver (No. 3), and [8] private power generation equipment only (drivers 23 to 25 are stopped).

[0033] The analog signal output device 14 is capable of outputting an analog signal corresponding to the set value of the fuel flow rate of the private power generation facility 22 and each of the driving machines 23 to 25 (for example, the fuel flow rate when the shaft power (P / P0) is 100%). The analog signal output device 14 is further provided with an analog adder, and when the C contact 56 is connected to the contact on the left side (the internal combustion engine stop side), it outputs an analog signal according to the fuel flow rate of the driving machine or private power generation facility corresponding to the switching position of the knob switch 60 as a fuel flow rate signal Q5.

[0034] For example, when the knob switch 60 is set to a position corresponding to the above [1], an analog signal corresponding to the fuel flow rate (set value) of the driver (No. 1) 23 is output. When the knob switch 60 is set to a position corresponding to the above [2], an analog signal corresponding to the sum of the fuel flow rates (set values) of the driver (No. 1) 23 and the driver (No. 2) 24 is output. When the knob switch 60 is set to a position corresponding to the above [8], an analog signal corresponding to the fuel flow rate (set value) of the private power generation facility 22 is output.

[0035] When the C contact 56 is connected to the contact on the left side (the internal combustion engine stop side) (i.e., when all internal combustion engines are stopped), the analog divider 52 receives the analog signal (total fuel flow rate signal) Q5 from the analog signal output device 14 and the analog signal (total remaining fuel amount signal) Q4 from the analog adder 51, and outputs an analog signal (remaining operable time signal) corresponding to the value (Q4 / Q5) obtained by dividing the former by the latter, which is input to the remaining operable time indicator 53, which is an analog meter.

[0036] As a result, even when the internal combustion engine is stopped, the theoretical remaining operable time is displayed in a state that can be seen by the operator. In particular, the internal combustion engine for driving the drainage pump has a rated output, and fluctuations in shaft power (i.e., fluctuations in fuel consumption) are small within the operating range shown in Figure 3(b), so even if it is a set value (theoretical value), it is possible to display and output a remaining operable time that is close to what it would be if the internal combustion engine were actually driven.

[0037] 4 shows an example of the operation of the remaining operating time display device according to the embodiment. When any one of the internal combustion engines is running ("Y" in S10 of FIG. 4), the C contact 56 of the on-site panel 13 is switched to the operating side (S11). The analog divider 52 of the on-site panel 13 receives an analog signal Q4 (=Q1+Q2) indicating the amount of remaining oil and an analog signal Q3 indicating the sum of the fuel flow rates q1-q4 of the internal combustion engines (the private power generation facility 22 and the drive machines 23-25) (S12), and outputs an analog signal indicating the remaining operating time (S13).

[0038] This analog signal is input to the remaining operable time indicator 53 to indicate the remaining operable time, and the lamps corresponding to the operating private power generating equipment 22 and driving machines 23 to 25 are turned on in the operating unit indicator light 54 to notify the operator of the private power generating equipment or driving machine that is in operation (S14).

[0039] When the analog signal (indicating the remaining operable time) output from the analog divider 52 of the on-site panel 13 falls below a set value ("Y" in S15 of FIG. 4), the fuel supply lamp 55 is turned on (S16). This makes it possible to prompt the operator to refuel.

[0040] On the other hand, when all of the internal combustion engines are stopped ("N" in S10 of FIG. 4), the C contact 56 of the on-site panel 13 is switched to the stop side (S21). The analog divider 52 of the on-site panel 13 receives the analog signal Q4 (=Q1+Q2) indicating the remaining oil amount and the analog signal Q5 indicating the fuel flow rate setting value (corresponding to the position of the knob switch 60) from the analog signal output device 14 (S22), and outputs an analog signal indicating the remaining operable time (S23).

[0041] This analog signal is input to the remaining operable time indicator 53, which indicates the (theoretical) remaining operable time, and also lights up the lamps in the operating unit indicator light 54 corresponding to the private power generating equipment 22 and driving units 23 to 25 indicated by the knob switch 60 (S14).

[0042] 5 is a block diagram showing another embodiment of a drive system 70 for a main pump unit equipped with a remaining operating time display device. This embodiment is the same as that shown in FIG. 1, except that a single fuel flow meter 71 is provided in the fuel pipe. An analog signal Q6 corresponding to the fuel flow rate measured by the fuel flow meter 71 indicates the sum of the fuel flow rates flowing to the private power generation facility 22 and the drivers 23-25, and this signal is input to an analog adder 50 on the on-site panel 13.

[0043] Then, an analog signal Q4 (=Q1+Q2) indicating the remaining oil amount and an analog signal Q6 indicating the sum of the fuel flow rates of the internal combustion engines (private power generation equipment 22 and drive machines 23-25) are input to an analog divider 52 of the on-site panel 13, which outputs an analog signal indicating the remaining operable time. With this configuration, there is no need to use fuel flow meters for the number of internal combustion engines, and the installation costs of the system can be reduced.

[0044] In the above embodiment, the private power generating equipment 22 and the driving machines 23-25 ​​are internal combustion engines, but if the fuel consumption of the private power generating equipment 22 is small, only the driving machines 23-25 ​​connected to the main pump device may be configured as internal combustion engines.

[0045] The above-described embodiments have been described for the purpose of enabling a person having ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments would naturally be possible for a person skilled in the art, and the technical concept of the present invention may also be applied to other embodiments. The present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope in accordance with the technical concept defined by the claims. [Explanation of symbols]

[0046] 14 Analog signal output device 20 Main pump unit 22 Private power generation facilities 23~25 Drive 26~29, 71 Fuel flow meter 40 Fuel dispense tank 41 Fuel tank 50, 51 Analog adder 52 Analog Divider 53 Remaining operating time indicator 54 Operation unit indicator light 55 Fuel lamp 56 C contact 60 Knob Switch

Claims

1. a display device connected to a drive unit that drives at least one main pump device using at least one internal combustion engine and a fuel supply unit that supplies fuel to the drive unit, the display device displaying a remaining operating time of the internal combustion engine, a first input / output unit connected to at least one fuel flow meter that measures a flow rate of fuel supplied to the internal combustion engine and that outputs a first analog signal that indicates the flow rate of fuel to the internal combustion engine; a second input / output unit connected to at least one remaining fuel measuring device that measures the amount of remaining fuel in the fuel supply unit and that outputs a second analog signal that indicates the amount of remaining fuel; an analog divider that receives the first analog signal and the second analog signal and outputs a third analog signal indicating a remaining operating time of the internal combustion engine; a display that receives the third analog signal and displays information indicating the remaining operating time of the internal combustion engine.

2. 2. The remaining operating time display device according to claim 1, wherein the first input / output unit is an analog adder that is connected to a plurality of the fuel flow meters corresponding to each of a plurality of internal combustion engines and outputs the first analog signal by adding up analog signals from the plurality of the fuel flow meters.

3. The remaining operating time display device of claim 1, wherein the second input / output unit is an analog adder connected to a plurality of remaining fuel measuring devices corresponding to each of a plurality of fuel reservoirs constituting the fuel supply unit, and outputs the second analog signal by adding up analog signals from the plurality of remaining fuel measuring devices.

4. an analog signal output device that outputs a fourth analog signal that indicates a set value of the fuel flow rate to the internal combustion engine; a switch that switches a connection with the analog signal divider between the first input / output unit and the analog signal output unit, 2. The remaining operating time display device according to claim 1, wherein the switch is switched to the analog signal output device side while the internal combustion engine is stopped.

5. 2. The remaining operating time display device according to claim 1, further comprising an output device that outputs an indication when the third analog signal output by the analog divider falls below a predetermined value.

6. 10. A drive system for a main pump device, comprising: the remaining operation time display device according to claim 1; an internal combustion engine for driving at least one main pump device; and a fuel supply unit for supplying fuel to the internal combustion engine.

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