JP2020112066A - Power source-free drain system, cooling system and cooling method - Google Patents

Abstract

To simply make a cooling system of a diesel engine by eliminating an unnecessary auxiliary machine and power supply equipment, while greatly reducing an amount of cooling water, by constructing a primary cooling mode without the need for a secondary cooling water.SOLUTION: A drain system includes: a water supply tank 1 for an engine; a diesel engine 4 arranged in the position lower in the gravity direction than the water supply tank 1 for the engine, and having a pump 5 with a machine; a water supply pipe 7 for sending the water stored in the water supply tank 1 for the engine into the pump 5 with the machine using the gravity as the cooling water; a line pump 26 for sending the cooling water discharged from the diesel engine 4 into the diesel engine 4 again, and complementing the pressure necessary for reflow; a heat exchanger 10 for lowering temperature of the cooling water; first transportation piping (27, 28) for sending the cooling water pressurized with the line pump 26 into the heat exchanger 10; and a reflux pipe 29 for refluxing the cooling water of the temperature lowered by the heat exchanger 10 into the pump 5 with the machine. The pump 5 with the machine works by the torque generated by the diesel engine 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drainage system, a cooling system for a diesel engine that drives a drainage pump used in this drainage system, and a cooling method for a diesel engine.

Electric motors were once used as the prime mover for driving the drainage pumps of drainage pump stations, but diesel engines that do not require self-ignition after the power failure due to water damage during the typhoon of Isewan are often used. A secondary cooling system using a heat exchanger is mainly adopted for cooling the main body of the land-use diesel engine installed in the drainage pump station, lubricating oil, etc., and is technology that uses groundwater of the ground, for example, as this secondary cooling water. Is known (see Non-Patent Document 1).

For example, in the case of the conventional drainage system using the secondary cooling water shown in FIG. 3, the water drawn up by the intake pump 18 from an external well or the like is stored as cooling water in the primary cooling water tank 21, and the stored primary cooling water is stored. Needs to be pumped by the first pumping pump 12, and a power source for the first pumping pump 12 is required. The primary cooling water is raised to the position of the diesel engine 4 via the water supply pipe 7z. Then, the cooling water is caused to flow inside the diesel engine 4 through the pump 5 with a machine, reaches the heat exchanger 10 through the drain pipe 8 from the outlet of the diesel engine 4, and the heat exchanger 10 uses the secondary cooling water to Next, cool the cooling water. The cooled primary cooling water is returned to the primary cooling water tank 21 again. On the other hand, the secondary cooling water is stored in the secondary cooling water tank 22 that communicates with the drainage tank 20 in which the drainage pump 11 is located and needs to be pumped up by the second pumping pump 13, You need a power supply. The secondary cooling water is sent to the heat exchanger 10 to be used for cooling the primary cooling water, and then discarded.

Originally, although the diesel engine 4 is power-free, there is an irrationality that the power source for the first pumping pump 12 and the second pumping pump 13 is required, and the advantage of the diesel engine 4 is not utilized. .. As described above, when the secondary cooling method is used, it is necessary to attach a certain auxiliary equipment or power supply equipment to the drainage pump station, which complicates the drainage pump station, increases the frequency of failures, and complicates maintenance work. Problems such as occur. Further, in the secondary cooling system, there may be a case where the secondary cooling water that is about twice as much as the amount discharged in the primary cooling system is required. Therefore, using the technique of Non-Patent Document 1, a large amount of unlimited groundwater can be obtained. If it is pumped up and used, the shallow groundwater in the ground will be depleted and hollowed out, increasing the possibility of ground subsidence. That is, it is practically difficult to use groundwater as a stable water source.

Japan Construction Mechanization Association, “Drainage Pump Equipment Inspection and Maintenance Guidelines” Japan Construction Mechanization Association, p122-124, 1979

The present invention has been made in view of the above problems, and an object of the present invention is to provide a drainage system, a cooling system for a diesel engine, and a cooling method that are completely free of power supply.

In order to achieve the above object, the first aspect of the present invention is (a) a water tank for an engine, and (b) a cooling water pump attached to an engine, which is arranged at a position lower than the water tank for an engine in the direction of gravity. (Hereinafter referred to as "equipment pump"), and (c) a small portion of the same is put into a drainage tank located at a position lower than the diesel engine in the gravity direction and driven by the diesel engine. A drainage pump, (d) a water supply pipe provided between the water tank for the engine and the machine-equipped pump, which feeds water stored in the water tank for the engine to the machine-equipped pump as cooling water by gravity, and (e) the machine The cooling water discharged from the diesel engine is sent to the diesel engine by the pump, and the line pump that complements the pressure necessary for the reflux to send the cooling water to the diesel engine again and (f) the drainage channel of the drainage pump is provided with the cooling water. A heat exchanger for lowering the temperature, (g) a first transportation pipe provided between the diesel engine and the heat exchanger, for feeding the cooling water pressurized by the line pump to the heat exchanger, and (h) the heat exchanger The drainage system is provided between the diesel engine and the diesel engine, and includes a reflux pipe that recirculates the cooling water cooled by the heat exchanger to the on-machine pump. In the drainage system according to the first aspect, when draining the water in the drainage tank, the pump with a machine operates by the rotational force generated by the diesel engine.

A second aspect of the present invention is (a) a water tank for an engine, (b) a diesel engine having a pump with a machine arranged at a position lower in the gravity direction than the water tank for an engine, and (c) for an engine. A water supply pipe installed between the water tank and the pump with an engine to feed the water stored in the water tank for the engine to the pump with a gravity as cooling water; The line pump that supplements the pressure required for the reflux of the cooling water discharged from the engine to the diesel engine again, (e) the heat exchanger that cools the cooling water, and (f) the space between the diesel engine and the heat exchanger. The first transport pipe installed in the heat pump to send the cooling water pressurized by the line pump to the heat exchanger, and (g) the cooling water cooled by the heat exchanger installed between the heat exchanger and the diesel engine. The gist is that it is a cooling system for a diesel engine that is equipped with a recirculation pipe that recirculates to a pump with a machine. In the cooling system for a diesel engine according to the second aspect, the on-machine pump operates by the rotational force generated by the diesel engine.

A third aspect of the present invention is (a) a diesel engine equipped pump arranged at a position lower in a gravity direction than an engine water tank via a water supply pipe connected to the engine water tank, Gravity-feeding water stored in the engine water tank as cooling water; (b) water-cooling the diesel engine using the cooling water by a pump equipped with a machine; and (c) a diesel engine using the line pump. Of the diesel engine including the steps of complementing the pressure of the cooling water discharged from the engine, (d) lowering the temperature of the cooling water whose pressure is complemented, and (e) returning the cooled cooling water to an on-machine pump. The point is that it is a cooling method.

According to the present invention, it is possible to construct a completely power source-free drainage system by a primary cooling system, and to provide a drainage system, a cooling system for a diesel engine, and a cooling method that make the most of the advantages of the diesel engine.

It is a block diagram which explains the outline of composition of a drainage system and a cooling system concerning an embodiment of the invention typically in a partial cross section. It is a graph which shows the performance curve of the pump with a machine of the drainage system and cooling system which concern on embodiment of this invention. It is a block diagram which explains the outline of the composition of the conventional drainage system typically in a partial section. It is a block diagram which explains the outline of the composition of the drainage system and the cooling system concerning the modification of the present invention partially in a section.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic and the relationship between the thickness and the plane dimension, the thickness ratio of each layer, and the like are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following description. Further, it is a matter of course that the drawings include portions having different dimensional relationships and ratios. Further, the embodiments described below exemplify a device and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, The arrangement is not limited to the following. Various changes can be added to the technical idea of the present invention within the technical scope defined by the claims described in the claims. Furthermore, the directions of "left and right" and "up and down" in the following description are merely definitions for convenience of description, and do not limit the technical idea of the present invention. Therefore, for example, if the paper surface is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and if the paper surface is rotated 180 degrees, "left" becomes "right" and "right" becomes "left". Of course,

--- Structure of drainage system and cooling system of diesel engine ---
As shown in FIG. 1, a drainage system and a diesel engine cooling system according to an embodiment of the present invention include an engine water tank 1 for storing cooling water for cooling a diesel engine 4 to be cooled, and an engine water tank 1. A water-cooled diesel engine 4 arranged at a position lower than the water supply tank 1 in the direction of gravity. The drainage system and the cooling system for the diesel engine according to the embodiment of the present invention are provided between the engine water tank 1 and the engine-equipped pump 5 of the diesel engine 4, and are stored in the engine water tank 1. A water supply pipe 7 that sends water as cooling water to the diesel engine 4 by gravity, a first line pump 26 that supplements the pressure for sending cooling water to the diesel engine, and a small amount of water in the drainage tank (water absorption tank) 20. It is a completely power-free system that includes a drainage pump 11 that is partially charged and driven by the diesel engine 4. Further, the drainage system and the cooling system for the diesel engine according to the embodiment of the present invention are provided between the heat exchanger 10 for exchanging heat by cooling the cooling water, and between the diesel engine 4 and the heat exchanger 10. It is provided between the heat exchanger 10 and the diesel engine 4, and the transportation pipes (27, 28) for sending the cooling water that has passed through the inside of the diesel engine 4 and has been heated to the heat exchanger 10, and the temperature is lowered by the heat exchanger 10. And a return pipe 29 for returning the cooling water to the diesel engine 4.

In the drainage system and the cooling system for the diesel engine according to the embodiment of the present invention, in addition to the valves and sensors shown in FIG. 1, although not shown, a cooling water such as a foot valve or a reverse blocking valve is provided. There are various valves and devices for maintenance and inspection that are usually taken into consideration when forming the path.

A drainage system and a cooling system for a diesel engine according to an embodiment of the present invention, for example, in a basin of a first-class or second-class river, inundation of a low area when the amount of water in the river increases during flood or high tide. It is provided for prevention and is used for cooling a plurality of diesel engines 4 at a drainage station for draining rainwater for disaster. As shown in FIG. 1, the drainage pumping station is provided with a multi-story building (pump shed), and inside the building, a plurality of drainage pumps 11 and each of them are required to drive these drainage pumps 11. A plurality of diesel engines 4 that generate various powers are stored. For convenience of explanation, illustrations of diesel engines other than the illustrated diesel engine 4 and devices such as an overhead crane used for maintenance work of the drainage pump 11 are omitted.

On the pump floor below the engine installation floor, a single-bed vertical shaft type drainage pump 11 is exemplarily provided. The drainage pump 11 drains water at, for example, about 12.5 tons/sec. In addition, water from the increased river is stored on the water storage floor below the pump floor inside the building, and forms the drainage tank 20 of the drainage station. If there are few drainage pumps 11 and a part thereof is put into the drainage tank 20, the water in the drainage tank 20 can be drained.

The diesel engine 4 and the drainage pump 11 corresponding to the diesel engine 4 are connected via a speed reducer 14 provided on the floor surface of the engine installation floor. An impeller (not shown) is provided inside the drainage pump 11, and when the diesel engine 4 operates, the rotary motion is transmitted from the diesel engine 4 to the rotary shaft 19 of the impeller, and the impeller rotates via the rotary shaft 19. As shown by the white arrow on the lower side of FIG. 1, water is pumped from the drainage tank 20. The pumped water is discharged to the outside of the building as shown by the white arrow on the right side of FIG. 1, and is also discharged from the building through a discharge water tank, etc. (not shown) provided in the site of the drainage pump station. Water is discharged to a remote place.

A water tank 1 for an engine is provided in a part or the whole area of the roof of a building located above the engine installation floor. An auxiliary water tank 2 is provided at a level lower than the engine water tank 1. At a part of the bottom of the engine water tank 1, a drainage channel for guiding rainwater that has poured into the entire space of the engine water tank 1 is provided so as to lead to the auxiliary water tank 2, and the drainage channel has a filtering device. 3 is attached so as to cover the upper part of the drainage channel. As the filtering device 3, for example, a roof drain or the like can be used. By the filtering device 3, rainwater that has rained all over the roof and is guided to the water tank 1 for the engine can be stored by injecting it into the water tank 1 for the engine while removing foreign matters such as dust.

A through hole is provided in the lower portion of the side wall of the auxiliary water supply tank 2, and a water supply pipe 7 that descends from the through hole and extends to the position of the engine installation floor is attached. Rainwater stored in the engine water tank 1 is supplied via the water supply pipe 7 to the diesel engine 4, which has been operated for drainage treatment and has a high temperature, as cooling water.

The engine water tank 1 positively utilizes this precipitation when a rainfall accompanied by a large amount of precipitation occurs to the extent that the drainage pump station is required to operate, and supplies cooling water for the diesel engine 4 to the engine. Store a large amount. Rainwater is always stored in the engine water tank 1 at a constant amount, and the diesel engine 4 can be stably supplied with cooling water. The cooling water descends from the roof to a height near the floor surface of the engine installation floor according to gravity inside the water supply pipe 7, and thus a completely power-free system in which no electric power is consumed can be constructed.

It should be noted that the water tank 1 for the engine may be provided at one corner of the roof when a drainage station is newly constructed. When the existing drainage station is modified and newly added, for example, a surplus space in the drainage station is used. Can be installed by utilizing. When the water tank 1 for an engine is installed at a place other than the rooftop, an existing drainage channel or water distribution pipe is appropriately modified or combined and used to separately form a route for introducing rainwater to the water tank 1 for an engine.

A through hole is provided in the side wall of the engine installation floor, and the water supply pipe 7 is bent at the height of the through hole and is connected to the first bypass pipe 9 through the through hole. The water supply pipe 7 may be configured to branch depending on the number of diesel engines 4 so as to be connected to each of the plurality of diesel engines 4 at the position of the water storage floor. The first bypass pipe 9 connects the water supply pipe 7 and the reflux pipe 29 by bypass. The cooling water supplied by gravity energy from the water supply pipe 7 reaches the pump 5 with a machine via the water supply pipe 7 and the first bypass pipe 9.

The machine-equipped pump 5 is built in the diesel engine 4 and draws cooling water inside. For example, as shown in the upper performance curve of FIG. 2, the diesel engine 4 has a rated point of a discharge amount of about 63 m ³ /hour and a total head of about 24.7 m. Further, as can be seen from the curve of the engine internal pressure loss shown in the lower side of FIG. 2, a loss of about 6 m occurs at the rated point of the diesel engine 4.

The cooling water inside the diesel engine 4 is fed into the passage of the diesel engine 4 through the machine-equipped pump 5 as schematically shown by the dotted line in FIG. An oil cooler 6 equipped with a diesel engine is provided in the middle of the passage of the cooling water. The passage of the cooling water may branch into two or more inside after passing through the inlet of the diesel engine 4. For example, the passage of the cooling water may become high in temperature around the combustion chamber, other than the passage on the oil cooler 6 side. There may be provided a jacket-side passage or the like through the water jacket for cooling the cylinder.

The cooling water flowing out from the inside of the diesel engine 4 is sent out to the first line pump 26 through the first pipe 27. A second pipe 28 is provided between the first line pump 26 and the heat exchanger 10. The second pipe 28 extends to the heat exchanger 10 along the floor of the engine installation floor through a through hole provided in the floor of the engine installation floor. The 1st piping 27 and the 2nd piping 28 are equivalent to the "1st transportation piping" of the present invention.

The first line pump 26 is driven by utilizing the rotational force of the diesel engine 4. Specifically, the rotary shaft 19 is provided with a first transmission device 23 such as a sprocket that transmits a rotational force, and the first transmission device 23 and the first line pump drive device 25 are connected to a first transmission device such as a chain. The rotational force of the diesel engine 4 may be transmitted by connecting via the driven member 24 of No. 1.

The heat exchanger 10 may be provided by being wound around the outer peripheral surface of the drain side pipe of the drain pump 11, or may be provided on the inner peripheral surface of the drain side pipe. The heat exchanger 10 uses the water of the drainage floor as a water source for secondary cooling, raises the temperature inside the diesel engine 4, and lowers the temperature of the cooling water sent to the heat exchanger 10. A reflux pipe 29 is connected to the outlet of the cooling water of the heat exchanger 10. The reflux pipe 29 extends toward the side wall of the drainage floor at the upper part of the drainage floor, and the end of the reflux pipe 29 on the side opposite to the heat exchanger 10 passes through a part branching to the first bypass pipe 9 and then the drainage pipe. It is connected to 39.

A through hole is provided on the side wall of the water storage floor near the floor surface of the engine installation floor, and the drain pipe 39 extends to the outside through the through hole. Further, a through hole is provided in the vicinity of the engine-equipped pump 5 of the diesel engine 4 on the floor of the engine installation floor, and a portion of the reflux pipe 29 branched to the first bypass pipe 9 side extends through the through hole. There is.

--- Operation of the drainage system and the cooling system of the diesel engine ---
Next, the operation of the drainage system and the cooling system of the diesel engine according to the embodiment of the present invention will be described by using the diesel engine 4 shown in FIG. 1 as an example. First, it is assumed that a predetermined amount of cooling water is stored in the engine water supply tank 1 in advance. Next, the cooling water stored in the engine water supply tank 1 is moved to the auxiliary water supply tank 2 through the filtration device 3, and then the inside of the vertically falling portion of the water supply pipe 7 is dropped by gravity from a high place. , Through the water supply pipe 7 and the first bypass pipe 9 into the machine-equipped pump 5.

For initial operation, if water is supplied by, for example, a fire engine and the pump 5 is operated, the cooling water supply process thereafter can utilize the effect of gravity, and after water supply, the crankshaft of the diesel engine 4 can be used. Since the pump 5 with the machine is also driven by the rotation, it is possible to continue the motion of the pump 5 with the machine without using a dedicated power source.

The cooling water sent to the diesel engine 4 by gravity flows through the engine-equipped pump 5 to the engine-equipped oil cooler 6 which is a passage of the cooling water to cool the oil, thereby cooling the diesel engine 4. The cooling water that has flowed through the machined oil cooler 6 flows out from the outlet of the diesel engine 4 via the first pipe 27 to the outside and is pressurized by the first line pump 26. Since the cooling water is sucked at the outlet side of the diesel engine 4 by the operation of the first line pump 26, the effective conductance of the cooling water inside the diesel engine 4 increases. If the temperature of the cooling water is, for example, about 20° C. in the engine water supply tank 1, the temperature of the cooling water is lowered and becomes about 23° C. at the inlet of the diesel engine 4. Furthermore, the temperature of the cooling water that has passed through the inside of the diesel engine 4 and illustrated in FIG. 2 and has risen in temperature is about 35° C. at the outlet of the diesel engine 4.

The cooling water flowing out of the diesel engine 4 via the first pipe 27 is pressurized by the first line pump 26, then flows through the second pipe 28, and reaches the heat exchanger 10. In the heat exchanger 10, the cooling water is cooled by the water in the drainage tank 20 to about 20° C., which is similar to the water temperature in the engine water supply tank 1. The cooled cooling water flows back to the first bypass pipe 9 through the reflux pipe 29. Then, the recirculated cooling water is combined with the cooling water supplied from the engine water supply tank 1 and sent again to the machine-equipped pump 5 to be used for cooling the diesel engine 4.

When it becomes necessary to replace the cooling water, such as when the temperature of the cooling water sent to the diesel engine 4 rises above a certain temperature, the opening/closing device such as a valve attached to each pipe is appropriately operated. The cooling water is drained through the drain pipe 39. Then, the diesel engine 4 is cooled while repeating the supply process of the cooling water from the engine water tank 1 and the cooling process of the primary cooling water by the heat exchanger 10 until the diesel engine 4 reaches a predetermined cooling target temperature. ..

A drainage system and a cooling system for a diesel engine according to an embodiment of the present invention use a water tank 1 for an engine provided on a rooftop of a drainage pump station to store rainwater that has fallen on the rooftop through a filter device 3 or the like. It is used as a stable water source for cooling water by storing a large amount directly. Therefore, no electricity is required to pump tap water to high places or ground water to the ground. In addition, since rainwater is used to store cooling water, it is possible to configure a very simple water storage facility by reducing incidental equipment.

Therefore, as in the case of a marine diesel engine that uses inexhaustible seawater as primary cooling water, even a land-based diesel engine uses gravity energy to stably supply cooling water and push it into the motorized pump 5. It is possible and does not require any secondary cooling water. Therefore, even the land diesel engine 4 can be cooled by the primary cooling method, which significantly reduces the amount of cooling water compared to the conventional method, and eliminates unnecessary auxiliary equipment and power supply equipment, thereby reducing the capital investment cost. It is possible to configure a simple drainage pump station that suppresses this.

Further, in the drainage system and the cooling system for the diesel engine according to the embodiment of the present invention, when the cooling water is sent to the diesel engine 4, the first line pump 26 is used separately from the machine-equipped pump 5, so that It is possible to suppress the load of the attached pump 5 and the request for excessive pressure. Therefore, even with the primary cooling system, a large amount of cooling water can be sent to the diesel engine 4 at a relatively low pressure. Further, it is possible to prevent the internal pressure of the engine from excessively rising due to the generation of excessive pressure of the machine-equipped pump 5, and to prevent water leakage inside the engine.

On the other hand, in the case of the conventional drainage system shown in FIG. 3, the power supply for the first pumping pump 12 and the second pumping pump 12 is required as described above. In the conventional drainage system shown in FIG. 3, water pumped up by an intake pump 18 from an external well or the like is stored as cooling water in a primary cooling water tank 21, and the stored primary cooling water is pumped by a first pumping pump 12 to supply water. It is raised to the position of the diesel engine 4 via the pipe 7z. Then, the cooling water is caused to flow inside the diesel engine 4 through the pump 5 with a machine, reaches the heat exchanger 10 through the drain pipe 8 from the outlet of the diesel engine 4, and the heat exchanger 10 uses the secondary cooling water to Next, cool the cooling water. The cooled primary cooling water is returned to the primary cooling water tank 21 again. On the other hand, the secondary cooling water is stored in the secondary cooling water tank 22 communicating with the drainage tank 20 in which the drainage pump 11 is located, and is pumped up by the second pumping pump 13 and sent to the heat exchanger 10 to It is used to cool the next cooling water and then discarded.

As described above, in the case of the conventional cooling process of the diesel engine, the raised primary cooling water is returned to the water storage facility such as a tank or is discarded. In this respect, according to the drainage system and the cooling system for a diesel engine according to the embodiment of the present invention, if the primary cooling water is about 35° C., the primary cooling water is heated to 20° C. by the heat exchanger 10. The temperature is lowered to a certain degree, and it is returned to the on-machine pump 5 and reused for cooling the diesel engine 4. Further, since the temperature of the primary cooling water is lowered by using the heat exchanger 10 using the drainage of the drainage pump 11, it is not necessary to separately store or pump up the secondary cooling water. As a result, the number of incidental equipment, etc. can be reduced, the total amount of cooling water used can be greatly reduced, and even a limited amount of cooling water can be used efficiently, greatly increasing the stable supply of cooling water. be able to.

In the past, due to the problem of securing a large amount of cooling water, a gas turbine that does not require cooling water may be used for the drainage pump.In that case, an electric ignition type gas turbine is driven even during a power outage, so private power generation is required. It was necessary to separately prepare incidental equipment such as machines. Further, the gas turbine has a disadvantage that it is bulkier than a diesel engine in terms of power consumption and cost per unit output. According to the drainage system and the cooling system for the diesel engine according to the embodiment of the present invention, the drainage pump station using the self-ignition type diesel engine 4 can be easily configured while suppressing the amount of cooling water used. Therefore, the drainage pump 11 can be driven reliably and economically by utilizing the advantages of the diesel engine even during a power failure.

(Modification)
The drainage system and the cooling system for the diesel engine according to the embodiment of the present invention described above exemplify the case where only the diesel engine 4 is cooled, but the invention is not limited to this, and the speed reducer 14 can be simultaneously cooled. Is. For example, as shown in FIG. 4, the cooling system according to the modified example of the present invention connects the pump 5 with the speed reducer 14 and sends a part of the cooling water supplied from the water supply pipe 7 to the speed reducer 14. The second bypass pipe 30 is further provided.

Further, a second transmission device 33 is provided on the rotary shaft 19 that connects the diesel engine 4 and the speed reducer 14, a second driven member 34 is attached to the second transmission device 33, and a second driven member 34 is attached. A second line pump driving device and a second line pump 36 are attached to the. The second transmission device 33, the second driven member 34, the second line pump drive device 35, and the second line pump 36 are respectively the first transmission device 23 and the first driven member shown in FIG. 24, the first line pump driving device 25, and the first line pump 26 have an equivalent structure, and thus redundant description will be omitted.

The speed reducer 14 and the second line pump 36 are connected by a third pipe 37, and the second line pump 36 and the heat exchanger 10 are connected by a fourth pipe 38. The third pipe 37 and the fourth pipe 38 correspond to the "second transportation pipe" of the present invention. The cooling water heated in the speed reducer 14 flows into the second pipe 28 through the third pipe 37 and the fourth pipe 38, merges with the cooling water flowing from the diesel engine 4 side, and flows into the heat exchanger 10. .. That is, according to the cooling system of the modified example of the present invention, the first line pump 26 and the second line pump 36 are simultaneously driven by using the rotation of the diesel engine 4 to cool the diesel engine 4 and further reduce the speed. The machine 14 can be cooled simultaneously and efficiently.

(Other embodiments)
Although the present invention has been described by the above embodiments, it should not be understood that the description and drawings forming a part of this disclosure limit the present invention. From this disclosure, it should be considered that various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art.

Further, in the cooling system of the present invention, the drainage pump of the drainage pumping station and the diesel engine that drives the drainage pump are not limited to one, but a plurality of drainage pumps or a plurality of diesel engines that drive a plurality of drainage pumps. Institution may be provided. In this case, the plurality of second water supply pipes are branched from the middle of the first pipe 27 shown in FIG. 1, and the first bypass pipes 9 are connected to the respective branches, so that the plurality of first water supply pipes are connected. It suffices to reach the respective machine-equipped pumps 5 of a plurality of diesel engines via the bypass pipe 9.

Then, a line pump may be provided in each of the plurality of diesel engines so that the cooling water discharged from each outlet of the diesel engine is pressurized by each line pump and reaches the heat exchanger 10. In the heat exchanger 10, the cooling water cooled by the water in the drainage tank 20 is returned to the respective first bypass pipes through the respective return pipes. The cooling water supplied from the water tank 1 can be merged and supplied again to each pump with a machine.

Further, the cooling system of the present invention is not limited to the diesel engine that drives the drainage pump of the drainage pumping station, and may be, for example, a diesel engine for a power generator (generator). Further, it is applicable to the case of water-cooling a diesel engine that drives a pump other than the drainage pump, such as a diesel engine that drives a pump for pumping irrigation water equipment.

In addition, a natural energy power generation device such as a solar power generation unit may be provided on the rooftop of the building of the drainage pump station or on an idle space on the premises. By using the electric power generated by the power generator as a power source for various power sources or a device for performing flow path switching control, the power required at the drainage pump station can be covered by itself. The surplus power of the generated power may be sold separately to a power company or the like.

As described above, the present invention includes various embodiments not described in the present specification and the drawings, and the technical scope of the present invention is to specify the invention according to the scope of claims appropriate from the above description. It is defined only by.

1 Water tank for engine 2 Auxiliary water tank 3 Filtration device 4 Diesel engine 5 Pump with machine 6 Oil cooler with machine 7, 7z Water supply pipe 8 Drain pipe 9 First bypass pipe 10 Heat exchanger 11 Drain pump 12 First pump 13 2nd pumping pump 14 Reducer 19 Rotating shaft 17 Opening/closing device 18 Water intake pump 20 Drained tank 21 Primary cooling water tank 22 Secondary cooling water tank 23 First transmission device 24 First driven member 25 First line pump drive Device 26 First line pump 27 First pipe 28 Second pipe 29 Reflux pipe 30 Second bypass pipe 33 Second transmission device 34 Second driven member 35 Second line pump drive device 36 Second line pump 37 Third pipe 38 Fourth pipe 39 Drain pipe

Claims (8)

An engine water tank,
A diesel engine having a pump with a machine, which is arranged at a position lower in the gravity direction than the water tank for the engine,
Drainage pump driven by the diesel engine, a small portion of which is put in a drainage tank located at a position lower in the gravity direction than the diesel engine,
A water supply pipe provided between the water tank for the engine and the pump with the machine, for feeding water stored in the water tank for the engine to the machine pump by gravity as cooling water,
A line pump that is sent to the diesel engine by the machined pump, the cooling water discharged from the diesel engine is complemented with a pressure necessary for recirculation to be sent to the diesel engine again,
A heat exchanger provided in the drainage path of the drainage pump to cool the cooling water,
A first transport pipe provided between the diesel engine and the heat exchanger, for feeding the cooling water pressurized by the line pump to the heat exchanger,
A reflux pipe that is provided between the heat exchanger and the diesel engine, and recirculates the cooling water whose temperature has been lowered by the heat exchanger to the machine pump,
And a drainage system, wherein the pump with a machine is operated by a rotational force generated by the diesel engine when the water in the drainage tank is drained. An engine water tank,
A diesel engine having a pump with a machine, which is arranged at a position lower in the gravity direction than the water tank for the engine,
A water supply pipe provided between the water tank for the engine and the pump with the machine, for feeding water stored in the water tank for the engine to the machine pump by gravity as cooling water,
A line pump that is sent to the diesel engine by the machined pump, the cooling water discharged from the diesel engine is complemented with a pressure necessary for recirculation to be sent to the diesel engine again,
A heat exchanger for cooling the cooling water,
A first transport pipe provided between the diesel engine and the heat exchanger, for feeding the cooling water pressurized by the line pump to the heat exchanger,
A reflux pipe that is provided between the heat exchanger and the diesel engine, and recirculates the cooling water whose temperature has been lowered by the heat exchanger to the machine pump,
The cooling system, wherein the pump with a motor is operated by a rotational force generated by the diesel engine. The cooling system according to claim 2, further comprising a drive device that drives the line pump by a rotational force generated by the diesel engine. 4. The cooling system according to claim 2, wherein the engine water supply tank is provided on a roof of a building that houses the diesel engine, and rainwater is stored in the engine water supply tank when it rains. The cooling system according to claim 4, further comprising a filter device that filters the rainwater between the engine water tank and the water supply pipe. Furthermore, a bypass pipe for sending the cooling water of the water supply pipe to the speed reducer for cooling the speed reducer of the diesel engine,
A second transport pipe that is provided between the speed reducer and the heat exchanger, and that sends the cooling water that has passed through the speed reducer and has been heated to the heat exchanger. The cooling system according to any one of claims 3 to 5. The 2nd line pump which is provided in the said 2nd transportation piping and complements the pressure for sending the said cooling water to the said reducer, The cooling system of Claim 6 characterized by the above-mentioned. Via the water supply pipe connected to the engine water tank, the water pump stored in the engine water tank to the engine-equipped pump of the diesel engine arranged at a position lower in the gravity direction than the engine water tank. The step of sending by gravity as cooling water,
Water cooling the diesel engine with the cooling water;
Using a line pump to supplement the pressure of the cooling water discharged from the diesel engine;
Lowering the temperature of the cooling water supplemented with pressure,
Refluxing the cooled cooling water to the pump with machine;
A cooling method comprising:

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