JPH05321876A - Precedence standby operation pump operating method - Google Patents

Abstract

PURPOSE:To restrain incomplete combustion of an engine, and save fuel consumption when a pump body is operated in a light load in a precedence standby operation pump. CONSTITUTION:The first engine E1 is connected to one input shaft end part 1a of a speed reducer R through the first clutch C1, and the second engine E2 is connected to the other end part 1b through the second clutch C2, respectively and separately from each other, and an output shaft 4 of the speed reducer R is connected to a main shaft of a pump body P. A load of the pump body P is detected, and the operating condition is judged, and when the pump body is operated in a high load, both the clutches C1 and C2 are put in an engaged condition so as to be put in a driving condition by means of both the engine E1 and E2, and when it is operated in a light load, only the second clutch C2 is put in a disengaged condition so as to be put in a driving condition only by means of the first engine E1.

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 preceding standby operation pump which uses an engine such as a diesel engine as a drive source.

[0002]

2. Description of the Related Art Due to the recent tendency of urban areas to become dense, it has become difficult to provide drainage storage channels on the ground. Therefore, as part of deep underground use, the idea of constructing a large-scale pumping station with a drainage and storage function underground has been proposed. When a pumping station is installed underground at such a deep depth, the preceding standby operation pump used as a pump facility has a function to perform drainage operation with a large capacity and a high head, and an operation such as preceding standby operation and pumping interruption operation. Functions such as operation in the air or light load are required.

On the other hand, in a preceding standby operation pump that uses an engine such as a diesel engine as a drive source, with respect to the load during operation of the pump main body, it is operated at the time of draining operation and at light load in air operation or water-water mixing. And when you do
The load on the engine is very different. Of course, it is necessary for the engine to have a performance capable of producing a sufficient output for the drain operation of the pump body, but an engine equipped with such an output performance can be operated in the air. If you try to operate the pump body with a light load such as when pumping or shutting off pumping, the load applied to the engine becomes too small, which may cause incomplete combustion of the engine and at the same time Fuel consumption is relatively high.

[0004]

The present invention has been made in view of the above circumstances. That is, in the method for operating the preceding standby operation pump according to the present invention, the drive system of the pump main body is equipped with two engines as power sources, and two pumps are used when a large output is required such as when the pump main body is drained. The required output is obtained by operating the pump main body with each engine, and the load is distributed to the two engines so that the output performance required for each engine is small. When a low output is required, such as when operating, by operating the pump body with one engine to obtain the required output and allowing that load to be burdened with one engine, The aim is to prevent the incomplete combustion of the engine at the same time and to save the fuel consumption at the time of light load.

[0005]

A method of operating an engine-driven pump according to the present invention comprises a casing surrounding an impeller chamber, a suction pipe having a suction port being continuously provided at a lower end of the casing, and a pumping start water level and pumping time during operation. A method of operating a preceding standby operation pump in which an air passage for controlling the cutoff water level is connected to the impeller chamber, wherein an output shaft of a first engine is connected to a first clutch at one end of an input shaft of a speed reducer. A drive system in which the output shaft of the second engine is connected to the other end of the input shaft of the speed reducer via the second clutch, and the output shaft of the speed reducer is connected to the main shaft of the pump body. Detects the load during pump operation to determine whether the pump is operating in the air, draining, starting pumping, or shutting off pumping. Then
In each state of drainage operation and operation at the start of pumping,
The first clutch and the second clutch are put in the connected state, and both the first engine and the second engine are driven to operate the pump main body. In each state of the air operation and the operation when pumping off, the first clutch And only one of the second clutches is disengaged, the engine corresponding to the disengaged clutch is stopped, and only the engine corresponding to the engaged clutch is driven to operate the pump main body. .

[0006]

According to the present invention, the output for rotating the main shaft of the pump main body is obtained by simultaneously operating the first and second two engines with both the first clutch and the second clutch in the connected state. Are obtained by these two engines. Nevertheless, the load on each engine is halved compared to driving the pump with one engine. That is, the load during operation of the pump body is distributed to the two engines. Therefore, the drainage operation in which a high load is applied to the drive system and the operation at the start of pumping can be performed by the engine having a small exhaust capacity.

On the other hand, if either the first clutch or the second clutch, for example, the second clutch is disengaged and the second engine is stopped, only the first engine corresponding to the engaged first clutch is driven. The output for rotating the main shaft of the pump body is obtained only by the first engine. Such an operating state is suitable for performing a light load operation such as an air operation during standby or an operation when the pumping is cut off. Since the load of the pump main body at the time of operation is added to the first engine, it is possible to prevent the load of the first engine from being unnecessarily reduced, which helps prevent incomplete combustion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an apparatus used in a method for operating a preceding standby operation pump according to an embodiment of the present invention, where R is a speed reducer, E1 is a first engine, and E2 is a second engine. , P indicates the pump main body of the preceding standby operation pump. The first engine E is attached to one end 1a of the input shaft of the speed reducer R.
The output shaft 2 of No. 1 is connected to the other end 1b of the input shaft of the speed reducer R via the first clutch C1, and the output shaft 3 of the second engine E1 is connected to the other end 1b via the second clutch C2. The output shaft 4 is connected to the main shaft 5 of the pump body P. Here, the drive system of the pump body P is composed of a first engine E1, a first clutch C1, a speed reducer R, a second engine E2, and a second clutch C2.

In the pump body P of the preceding standby operation pump, a casing 61 surrounding the impeller chamber 60 is connected with a suction pipe 63 having a suction port 62 at its lower end, and the pumping start water level and pumping cutoff water level during operation are set. A ventilation passage for controlling is connected to the impeller chamber. In the preceding standby operation pump of the illustrated example, the ventilation passage is formed by the through hole 64 formed in the suction pipe 63 below the impeller chamber 60, the suction pipe 63, and the internal space passage 65 of the impeller chamber 60. Further, an intake pipe 66 having an intake valve 67 is communicated with the through hole 64 of the air passage. 68 is a pumping pipe, 69
Is a water level gauge for controlling the opening and closing of the intake valve 67.

Such a preceding standby operation pump operates as follows, for example. That is, when the water level rises at the pump installation location, the intake valve 67 is opened and the air operation is performed until the water level reaches the pumping start water level L2, and when the water level is the pumping start water level, the operation at the pumping start time is performed. , When the water level rises above the pumping start water level L2, the intake valve 67
By closing the and shutting off the air introduction, drainage operation using only water (normal drainage operation) is performed.

On the other hand, when the water level is lowered at the pump installation location, the intake valve 67 is closed and the water level is the pumping cutoff water level L1.
The normal drainage operation is continued until the water level reaches, and the operation at the time of water cutoff is performed by opening the intake valve 67 when the water level reaches the water cutoff water level L1.

Next, in the method of operating the preceding standby operation pump according to the embodiment, whether the operating state of the pump body P is the air operation by detecting the load during the operation of the pump body P,
It is determined whether the operation is the drain operation, the operation at the start of pumping, or the operation at the time of stopping the pump, and in each state of the drain operation and the operation at the start of pumping, the first clutch C1 and the second clutch C2. Is connected and the first engine E1 and the second engine E2 are both driven to operate the pump body P. In each of the air operation and the operation at the time of pumping off, the second clutch C2 is disengaged. And the second engine E2 corresponding to the second clutch C2 in the disengaged state is stopped and the first clutch C1 in the connected state is
In order to drive the pump body P by driving only the first engine E1 corresponding to.

By the way, the load applied to the drive system is almost the same when the pump main body P is drained or pumped when the water level in the water tank (not shown) is raised or lowered. 100%). When performing aerial operation when the water level of the water tank rises, a light load of about 5 to 10% of the load of the pump main body P during drainage operation is applied to the drive system, and pumping when the water level of the water tank is lowered. It has been confirmed that, when the operation after shutting off is performed, 50% or less of the load of the pump body P during the drainage operation is applied to the drive system.

Therefore, when the above-mentioned operating method is adopted, when the load of the pump main body P becomes larger than the value of 50% of the load of the draining operation or the operation at the start of pumping, this is detected by the detecting means (described later). It is determined that the operating state of the pump body P is detected to be the draining operation or the operation at the start of pumping. Then, the first clutch C1 and the second clutch C2 are both in the connected state, and the first and second two engines E1 and E2 are simultaneously operated. In such an operating state, the load applied to each of the engines E1 and E2 is halved compared to the case where the pump is driven by one engine. In other words, the first engine E1
It is also possible to use an engine with a small output as the second engine E2. Nevertheless, since the output for rotating the main shaft of the pump body P is obtained by the two engines E1 and E2, the drainage operation and the operation at the start of pumping can be performed without any trouble.

When the load of the pump body P becomes 50% or less of the load of the drainage operation or the operation at the start of pumping, that is detected by the detecting means and the operating state of the pump body P is in the air operation or It is judged that the operation is when the pumping is cut off. Then, the second clutch C2 is disengaged, the second engine E2 is stopped, and only the first engine E1 corresponding to the engaged first clutch C1 is operated. Therefore, the load applied to the drive system is all borne by the first engine E1, the load applied to the first engine E1 is not so small as that applied during the drainage operation, and the incomplete combustion is less likely to occur. .. Further, since the load applied to the second engine E2 is 0, the fuel consumption amount is saved in the entire drive system.

Next, there are various means for detecting the load during operation of the pump body P. For example, when the first engine E1 and the second engine E2 are diesel engines, the scale of the fuel injection adjusting rack and the exhaust temperature can be used as the load detecting means. In addition, a means to detect the torque of the pump spindle using a torque sensor and to calculate the load from the detected value, a means to detect the water level in the water tank and then to calculate the load from the value, a water supply detection installed in the pumping passage of the vertical pump It is possible to suitably employ a means for determining the load from the value detected by the container.

In the embodiment described above, when the pump main body P is operated in the air or when pumping is interrupted, only the second clutch C2 is in the disengaged state, and the first clutch C1 in the connected state corresponds to the first clutch C1. Although the method of setting the drive state by only the engine E1 has been described, only the first clutch C1 is disengaged when the pump main body P is operated in the air or when pumping is cut off, and the second clutch C2 in the connected state is supported. Alternatively, the driving state may be set to the second engine E2 only.

[0018]

According to the present invention, the high-load operation of the pump main body, that is, the operation at the time of drainage operation and the start of pumping can be performed without trouble in an engine having a small exhaust capacity of about 50% of the conventional exhaust capacity. become. Therefore, the fuel consumption amount during the low load operation of the pump body, that is, the air operation or the operation when the pumping water is cut off is saved. Further, in the low load operation of the pump main body, one engine bears the load of the pump main body, so that in the engine, a large fluctuation does not occur between the high load operation and the low load operation. That is,
The load on the engine does not become unnecessarily small during air operation or pump cutoff operation. Therefore, incomplete combustion of the engine during light load operation is prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a preceding standby operation pump used in an embodiment of the present invention.

[Explanation of symbols]

 1a One end of the input shaft of the speed reducer 1b The other end of the input shaft of the speed reducer 2 Output shaft of the first engine 3 Output shaft of the second engine 4 Output shaft of the speed reducer 60 Impeller chamber 61 Casing 62 Suction port 63 Suction Pipe 64 Through hole (ventilation passage) 65 Internal space passage R Reduction gear E1 1st engine E2 2nd engine C1 1st clutch C2 2nd clutch LI Pumping cutoff water level L2 Pumping start water level

Claims (1)

[Claims] 1. A suction pipe having a suction port is continuously provided at a lower end of a casing surrounding an impeller chamber, and a ventilation path for controlling a pumping start water level and a pumping cutoff water level during operation communicates with the impeller chamber. In the method of operating the preceding standby operation pump, the first output shaft of the first engine is provided at one end of the input shaft of the speed reducer.
A drive system is provided in which the output shaft of the second engine is connected to the other end of the input shaft of the speed reducer via the clutch and the output shaft of the speed reducer is connected to the main shaft of the pump body. , Whether the operating state of the pump body is air operation, drainage operation, pumping start operation, or pumping cutoff operation by detecting the load during operation of the pump body In each state of drainage operation and operation at the start of pumping,
The first clutch and the second clutch are put in the connected state, and both the first engine and the second engine are driven to operate the pump main body. In each state of the air operation and the operation when the pumping is cut off,
Only one of the first clutch and the second clutch is disengaged, the engine corresponding to the disengaged clutch is stopped, and only the engine corresponding to the engaged clutch is driven to operate the pump main body. A method for operating an engine-driven pump, which is characterized in that