JP2014066210A - Engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a connection pipe connecting heat exchangers for simplifying external appearance of the whole of an engine, reducing a weight, and decreasing a pressure drop of cooling water.SOLUTION: An engine 1 includes an intercooler 21 serving as a heat exchanger which performs cooling with cooling water, a lubrication oil cooler 25, and a clear water cooler 22. Connection pipes 45, 46, 47 connecting the intercooler 21, the lubrication oil cooler 25, and the clear water cooler 22, connect a plurality of heat exchangers in series and are provided in one face side of the engine 1.

Description

  The present invention relates to an engine technology, and more particularly to a heat exchanger and a layout technology of connecting pipes connecting the heat exchangers.

  Conventionally, in an engine mounted on a ship, seawater from the outside of the ship is taken in as primary cooling water, heat exchange is performed with a heat exchanger such as an intercooler, a lubricant cooler, and a fresh water cooler, and then discharged outside the ship. The configuration is known. Each heat exchanger is equipped with a pipe (connection pipe) that connects them.

  For example, in the engine shown in Patent Document 1, a cooling water pump (seawater pump) and a fresh water cooler are provided on the front surface, an intercooler is provided on the right side surface, and a lubricating oil cooler is provided on the left side surface. The fresh water cooler, the intercooler, and the lubricating oil cooler that are heat exchangers are connected to each other by a plurality of cooling water pipes that surround the entire circumference of the engine. And the cooling water from a cooling water pump is guide | induced to a lubricating oil cooler, an intercooler, and a fresh water cooler, and is discharged | emitted from a fresh water cooler to the exterior. The cooling water cools the air in the intercooler, the lubricating oil in the lubricating oil cooler, and the fresh water in the fresh water cooler through heat exchange.

  In such an engine, the cooling water pipe (connection pipe) that connects the cooling water pump, lubricating oil cooler, intercooler, and fresh water cooler to each other is long, causing pressure loss and increasing the overall weight of the engine. Invite the complexity of the image.

JP 2005-299393 A

  The problem to be solved is to shorten the connecting pipes connecting the heat exchangers so that the overall appearance of the engine is clean and the weight can be reduced and the pressure loss of the cooling water can be reduced. Is to provide.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the engine includes a plurality of heat exchangers that are cooled by cooling water, and the connection pipe that connects the plurality of heat exchangers connects the plurality of heat exchangers in series. Is provided on one side of the engine.

  According to a second aspect of the present invention, the plurality of heat exchangers are provided on the same straight line in the longitudinal direction of the engine.

  In Claim 3, The said several heat exchanger contains the fresh water cooler in which the fresh water which cools an engine main body is cooled, The water pump which pumps the fresh water from the said fresh water cooler to an engine main body, The said fresh water cooler And a fresh water connecting pipe for connecting the water pump, and a flange portion is formed at an end of the fresh water connecting pipe, and the flange portion is introduced into the engine body separately from the fresh water. A discharge pipe for discharging the cooling water to the outside of the engine is connected.

  In Claim 4, the said discharge pipe is connected to the said flange part at right angles to the flow direction of the fresh water which flows through the said fresh water connection pipe.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the connecting pipe can be shortened by connecting the plurality of heat exchangers in series. Furthermore, since the connecting pipe is provided on the one surface side of the engine, the connecting pipe can be further shortened. Therefore, the appearance image of the whole engine can be improved, the weight can be reduced, and the pressure loss of the cooling water can be reduced.

  In claim 2, by arranging a plurality of heat exchangers on the same straight line in the longitudinal direction of the engine, the appearance of the entire engine can be improved, weight can be further reduced, and cooling can be further achieved. Reduction of water pressure loss can be achieved.

  In claim 3, the discharge pipe for discharging the cooling water introduced into the engine body separately from the fresh water to the outside of the engine is connected to the flange portion of the fresh water connection pipe for connecting the fresh water cooler and the water pump. Thus, the entire connection pipe, which is a fresh water connection pipe, can be shortened without providing a special connection member and without increasing the outer shape of the entire engine. Further, since it is not necessary to provide a special connecting member, an extra space is created, and the space such as the exhaust pipe can be arranged without difficulty or the maintenance work is facilitated can be effectively used.

  In claim 4, the discharge pipe for discharging the cooling water introduced into the engine body separately from the fresh water to the outside of the engine is in the flow direction of the fresh water flowing through the fresh water connection pipe connecting the fresh water cooler and the water pump. By connecting to the flange portion at a right angle to the flange portion, the discharge pipe can be connected to the flange portion without difficulty.

1 is a perspective view showing an overall configuration of an engine according to an embodiment of the present invention. Similarly front view. Similarly right side view. The figure which shows the structure of an intercooler. (A) Front view of intercooler. (B) Rear view of intercooler. The top view which showed the whole structure of the engine which concerns on one Embodiment of this invention. The right view which shows the periphery of a flange part.

Next, an engine 1 according to an embodiment of the invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing the overall configuration of an engine according to an embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is a right side view.

  In the following description, the side of the engine 1 where the exhaust manifold 12 is disposed is the front side (front side), and the opposite side is the back side (rear side). In the left-right direction, the left side when the observer looks at the front side of the engine 1 is the left side of the engine 1, and the right side is the right side of the engine 1.

  The engine 1 of this embodiment is a six-cylinder diesel engine mounted on a ship.

  The engine 1 includes an engine body, and an intake / exhaust system, a cooling water system, and a lubricating oil system that are installed in the engine body.

  The engine body includes a cylinder block 2 having a shape that extends long in the left-right direction. A plurality of (six in this embodiment) cylinders are formed in the cylinder block 2 in the vertical direction, and a piston is accommodated in each cylinder so as to be slidable in the vertical direction. A cylinder head 3 is provided at the upper end of the cylinder block 2, and an oil pan 4 is provided at the lower end of the cylinder block 2.

  The cylinder block 2 is provided with a crankshaft (not shown) that extends substantially horizontally in the left-right direction. A flywheel is attached to the left end of the crankshaft. The flywheel is covered with a flywheel housing 7 fixed on the left side of the cylinder block 2.

  A damper is attached to the right end of the crankshaft. The damper is covered with a damper case 8 fixed on the right side of the cylinder block 2.

  An intake manifold constituting a part of the intake system is formed on the left side of the front portion of the cylinder block 2. Further, an exhaust manifold 12 constituting a part of the exhaust system is provided in front of the cylinder head 3.

  The intake system of the engine 1 will be described.

  Among the intake / exhaust systems, the intake system mainly includes an air cleaner 13, a part of the supercharger 14, an intercooler 21, an intake manifold, and an intake port.

  The air cleaner 13 is provided above the exhaust manifold 12 and removes air supplied to the engine body. The air cleaner 13 is connected to the compressor case 14 a of the supercharger 14.

  The supercharger 14 is provided above the exhaust manifold 12. The supercharger 14 has a compressor case 14a containing a blower wheel (not shown) and a turbine case 14b containing a turbine wheel (not shown). The supercharger 14 is configured to transmit the rotational force of the turbine wheel by the exhaust gas to the blower wheel via the turbo shaft. Among these, the air cleaner 13 is connected to the compressor case 14a on the left side of the supercharger 14, and is configured to compress the air in the compressor case 14a with a blower wheel. The outlet of the compressor case 14 a of the supercharger 14 is connected to the intake inlet 21 c of the intercooler 21 via the supercharge pipe 15.

  The intercooler 21 is for cooling the air that has been compressed by the supercharger 14 and has reached a high temperature. The intercooler 21 is provided on the left side of the front surface of the cylinder block 2 where the intake manifold is formed. As shown in FIG. 4, the intercooler 21 is formed with an intake passage 21a through which air passes and a cooling passage 21b (core) through which seawater as cooling water passes. In the intake passage 21a, one intake inlet 21c and a plurality of intake outlets 21d, 21d, and 21d are formed. An intake inlet 21 c of the intake passage 21 a is provided in the upper part of the intercooler 21, and an intake outlet 21 d of the intake passage 21 a is provided at a position facing an intake manifold formed in the cylinder block 2. Further, the intake inlet 21c of the intake passage 21a is formed on the right side with respect to the center of the left and right of the intercooler 21. An intake outlet 21d of the intake passage 21a is connected to an intake manifold formed in the cylinder block 2 shown in FIGS. The intake manifold branches into the number of cylinders (six) as it goes to the cylinder (cylinder) side, and communicates with the cylinder (cylinder) via an intake port.

  Thus, the air is sucked into the air cleaner 13 and removed, and then compressed in the compressor case 14a of the supercharger 14 so that the temperature becomes high, and the air is supplied to the cooling passage (core) in the intercooler 21 via the supercharge pipe 15. It cools by contacting and passing through an intake passage, and is supplied into each cylinder through each intake port of the cylinder head 3 via an intake manifold.

  Next, the exhaust system of the engine 1 will be described.

  Of the intake / exhaust systems, the exhaust system mainly includes an exhaust port, an exhaust manifold 12, a turbine case 14b of the supercharger 14, and an exhaust pipe 16.

  The exhaust port is an exhaust passage for guiding exhaust gas discharged from each cylinder in the cylinder block 2 to the exhaust manifold 12. The exhaust port is formed in the cylinder head 3 and connected to the exhaust manifold 12.

  The exhaust manifold 12 collects exhaust gases from a plurality of exhaust ports into one exhaust passage. The exhaust manifold 12 is provided on the front side of the cylinder head 3. The exhaust manifold 12 is formed with an exhaust passage through which exhaust gas passes and a cooling passage through which cooling water passes. The exhaust passage is formed so that a plurality of (six in the present embodiment) inlets are aggregated into one outlet. The inlet of the exhaust passage of the exhaust manifold 12 is formed at a position corresponding to the exhaust port of the exhaust port, and the outlet of the exhaust passage of the exhaust manifold 12 is formed at the center of the left and right of the upper surface of the exhaust manifold 12. The outlet of the exhaust passage of the exhaust manifold 12 is connected to the turbine case 14 b of the supercharger 14.

  The turbine case 14b of the supercharger 14 is for rotating the turbine wheel by the exhaust gas from the exhaust manifold 12, and rotating the blower wheel in the connected compressor case 14a via the turbo shaft. The outlet of the turbine case 14b of the supercharger 14 is provided on the right side of the turbine case 14b, and the discharge pipe 16 is connected to the outlet of the turbine case 14b. On the outlet side of the discharge pipe 16, a flange portion for attaching an external guide pipe is formed.

  Thus, the exhaust gas passes through the exhaust ports of the cylinder head 3 from the cylinders and passes through the exhaust manifold 12 to be collected while being cooled, and after rotating the turbine wheel in the turbine case 14b of the supercharger 14. , Flows to the discharge pipe 16 and is discharged from the guide pipe (not shown) to the outside of the ship.

  Next, the cooling water system will be described.

  The cooling water system suppresses a temperature rise of an appropriate device or a fluid (gas or liquid) in the device by exchanging heat with the cooling water. The cooling water system of the engine 1 of the present embodiment includes a type using fresh water as a cooling water and a type using seawater.

  The cooling water system using fresh water is configured to circulate through the fresh water cooler 22, the water pump 23, the water jacket inside the cylinder block 2, the water jacket inside the cylinder head 3, the cooling passage inside the exhaust manifold 12, and the fresh water tank. .

The fresh water cooler 22 mainly includes a tank part, a cooler part, and a thermostat, and is for cooling while storing fresh water that cools the engine body.
The fresh water cooler 22 is supported by the cylinder block 2 via a bracket 22a on the right side of the exhaust manifold 12. The inlet of the fresh water cooler 22 is formed on the front surface of the fresh water cooler 22, and is a common inlet for the tank part at the upper part and the cooler part at the lower part in the fresh water cooler 22. A thermostat is provided between the inlet of the fresh water cooler 22 and the tank and cooler sections. This thermostat is led to the cooler if the temperature of fresh water flowing from the inlet is equal to or higher than a set value, and to the tank if it is lower than the set value.
Each of the tank part and the cooler part is formed with an outlet for discharging the fresh water inside, and is connected to an outlet formed on the lower surface of the fresh water cooler 22 after becoming a single discharge passage in the fresh water cooler 22. . The outlet of the fresh water cooler 22 is connected to the suction port of the water pump 23 via a fresh water connection pipe 41 (see FIG. 3).

  The water pump 23 is for pumping the fresh water in the fresh water cooler 22 into the engine body, and is provided on the right side surface of the cylinder block 2. The discharge port of the water pump 23 is connected to the right side surface of the cylinder block 2 through a connection pipe (not shown) and communicates with a water jacket in the cylinder block 2. The water jacket in the cylinder block 2 further communicates with the water jacket inside the cylinder head 3. The water jacket of the cylinder head 3 communicates with the inlet of the cooling passage of the exhaust manifold 12.

  The cooling passage of the exhaust manifold 12 is formed around the exhaust passage, and has six inlets through which cooling water flows and one outlet through which it flows. The six inlets are formed at predetermined intervals on the rear side of the exhaust manifold 12, that is, on the cylinder head 3 side. The outlet of the cooling passage of the exhaust manifold 12 is formed on the right side of the upper surface of the exhaust manifold 12. The outlet of the cooling passage is connected to the inlet of the fresh water cooler 22 via the connection pipe 43. The inlet of the fresh water cooler 22 is formed on the front surface of the fresh water cooler 22 and communicates with the inside of the fresh water cooler 22.

  That is, the fresh water is pumped from the fresh water cooler 22 by the water pump 23 through the fresh water connection pipe 41 and is pumped to the water jacket inside the cylinder block 2 and the water jacket inside the cylinder head 3 to each water jacket. The apparatus in contact therewith is cooled, and further flows into the cooling passage in the exhaust manifold 12 to cool the outside of the exhaust manifold 12, and then returns to the fresh water cooler 22 again. That is, fresh water circulates through a cooling system composed of these devices.

  The seawater cooling water system is mainly composed of a seawater pump 24, an intercooler 21, a lubricating oil cooler 25, and a fresh water cooler 22.

  The seawater pump 24 is for taking in seawater from the outside of the engine 1, and is provided on the left side of the cylinder block 2. An inflow pipe 44 is connected to the inlet of the seawater pump 24. A flange portion is formed on the inflow side of the inflow pipe 44 so that a guide pipe for guiding seawater outside the engine 1 is easily connected. The discharge port of the seawater pump 24 is connected to the inlet of the cooling passage 21 b of the intercooler 21 through the connection pipe 45.

  The intercooler 21 is for cooling the air that has become hot due to the compression of the supercharger 14, and is provided on the front surface of the cylinder block 2 in which the intake manifold is formed. The intercooler 21 is provided on substantially the same straight line as the connected lubricating oil cooler 25 with its longitudinal direction being the left-right direction. The cooling passage 21 b of the intercooler 21 has an inlet formed on the left side of the intercooler 21 and an outlet formed on the right side of the intercooler 21. The outlet of the cooling passage 21 b is connected to the inlet of the cooling passage of the lubricating oil cooler 25 through the connection pipe 46.

  The lubricating oil cooler 25 is for cooling the lubricating oil, and is arranged in series on the front surface of the cylinder block 2 on the same straight line as the intercooler 21. The lubricating oil cooler 25 includes a lubricating oil pipe through which lubricating oil flows and a cooling passage formed around the lubricating oil pipe. The inlet of the cooling passage is formed on the left side of the lubricating oil cooler 25, and the outlet of the cooling passage is formed on the right side of the lubricating oil cooler 25. The outlet of the lubricating oil cooler 25 is connected to an inlet formed on the front surface of the fresh water cooler 22 above the lubricating oil cooler 25 via a connection pipe 47.

  The fresh water cooler 22 is for cooling the fresh water in the above-mentioned cooler part with seawater. A pipe through which seawater from the lubricating oil cooler 25 passes is disposed in the cooler portion of the fresh water cooler 22, and the fresh water comes into contact with the pipe and is cooled. The outlet of the fresh water cooler 22 is formed so as to be positioned above the inlet on the front surface of the fresh water cooler 22. The outlet of the fresh water cooler 22 is connected to the discharge pipe 48. The exhaust pipe 48 has a flange portion on the outlet side so that a guide pipe (not shown) outside the engine 1 can be easily connected.

  That is, the seawater for cooling is pumped up from the outside of the engine 1 by the seawater pump 24 through the inflow pipe 44, flows into the cooling passage of the intercooler 21 through the connection pipe 45, and is brought into contact with the cooling passage. The cooling oil is cooled and further flows into the cooling passage of the lubricating oil cooler 25 through the connection pipe 46 to cool the lubricating oil in contact with the cooling passage, and then flows into the fresh water cooler 22 through the connection pipe 47 and flows into the fresh water cooler. After the 22 fresh water is cooled, it is discharged to the outside of the engine 1 through the discharge pipe 48 and the induction pipe.

  Next, the lubricating oil system will be described.

  The lubricating oil system is for supplying lubricating oil into the engine body and lubricating appropriate devices. The lubricating oil system mainly includes an oil pan 4, a lubricating oil pump in the casing 31, a lubricating oil passage in the lubricating oil cooler 25, a lubricating oil filter 32, and a lubricating oil bypass filter 33.

  The oil pan 4 is a lubricating oil tank in which lubricating oil is stored. The oil pan 4 is connected to a suction port of the lubricating oil pump via a connection pipe 51 connected to the right side of the oil pan 4.

  The lubricating oil pump is for pumping up lubricating oil in the oil pan 4, and is attached to the right side of the front surface of the cylinder block 2 via a casing 31. The discharge port of the lubricating oil pump is formed on the left side of the casing 31 and connected to the branch pipe 34.

  The branch pipe 34 is formed with one lubricating oil inlet and two lubricating oil outlets. The first discharge port 34 a, which is one of the discharge ports, is connected to the inlet of the lubricant passage on the lower right side of the lubricant cooler 25. The outlet of the lubricating oil passage is formed on the lower left side of the lubricating oil cooler 25 and is connected to the inlet at the top of the collecting pipe 35.

  The collecting pipe 35 mixes the lubricating oil cooled by the lubricating oil cooler 25 and the uncooled lubricating oil from the branch pipe 34 to obtain a lubricating oil having an appropriate temperature. An inlet is formed on the right side of the collecting pipe 35, and the second outlet 34b, which is the other outlet of the branch pipe 34, is connected to the inlet. Further, the outlet at the lower end of the collecting pipe 35 is an outlet for lubricating oil having an appropriate temperature, and is connected to the upper part of the lubricating oil filter 32.

  The lubricating oil filter 32 is for removing impurities and the like of the lubricating oil, and is provided on the front surface of the cylinder block 2. The discharge port of the lubricating oil filter 32 is connected to the inlet side of the connection pipe 52. The discharge side of the connection pipe 52 is branched into two, and one discharge port is connected to the front surface of the cylinder block 2. The other discharge port is connected to a lubricating oil bypass filter 33 on the right side of the lubricating oil filter 32 via a connecting pipe 53. The discharge side of the lubricating oil bypass filter 33 is connected to the oil pan 4.

  That is, the lubricating oil in the oil pan 4 pumped up by the lubricating oil pump is divided into two hands on the downstream side of the branch pipe 34. Then, one lubricating oil passes through the first discharge port 34 a of the branch pipe 34, passes through the lubricating oil cooler 25, is cooled, and flows into the collecting pipe 35. The other lubricating oil flows through the second discharge port 34b of the branch pipe 34 and flows into the collecting pipe 35 without being cooled. The cooled lubricating oil and the uncooled lubricating oil are merged in the collecting pipe 35, and the lubricating oil is set to an appropriate temperature. The lubricating oil having an appropriate temperature is separated into two by the connecting pipe 52 after impurities are filtered by the lubricating oil filter 32. Then, one lubricating oil flows into the cylinder block 2 and lubricates an appropriate device of the engine body, and then returns to the oil pan 4. The other lubricating oil returns to the oil pan 4 through the lubricating oil bypass filter 33.

  Next, the layout of the seawater pump 24, the intercooler 21 as a heat exchanger, the lubricating oil cooler 25, the fresh water cooler 22, and the connecting pipes connecting them will be described in detail.

  As described above, the intercooler 21 and the lubricating oil cooler 25 are connected in series on a substantially straight line via the connecting pipe 46 as shown in FIGS. 1, 2, and 5. The conventional intercooler is provided on the surface opposite to the side where the lubricant cooler is disposed. Therefore, a connecting pipe that connects the intercooler and the lubricating oil cooler and allows seawater as cooling water to pass therethrough is provided so as to surround the entire circumference of the engine. Therefore, the connecting pipe connecting the intercooler and the lubricating oil cooler is inevitably long.

  In the present embodiment, the seawater pump 24 is provided from the front surface of the left side surface of the cylinder block 2. A connection pipe 45 is connected to the discharge port of the seawater pump 24. That is, the discharge port of the seawater pump 24 is located on the left extension of the front surface of the cylinder block 2.

  The connecting pipe 45 that connects the seawater pump 24 and the intercooler 21 is mainly composed of two pipes. The connection pipe 45a connected to the seawater pump 24 side extends from the seawater pump 24 at a substantially right angle to the straight line on which the intercooler 21 is disposed. That is, the connection pipe 45a is a pipe whose longitudinal direction is the front-rear direction. The inlet of the connecting pipe 45a is formed at the rear end, and the outlet of the connecting pipe 45a is formed above the front end. The connection pipe 45b on the intercooler 21 side is a pipe whose flow direction is the left-right direction. The connection pipe 45 b is provided on an extension line between the intercooler 21 and the lubricating oil cooler 25. The inlet of the connecting pipe 45b is formed below the left end portion of the connecting pipe 45b and joined to the outlet of the connecting pipe 45a. The outlet of the connection pipe 45b is formed at the right end and is connected to the inlet of the cooling passage 21b of the intercooler 21. That is, the connecting pipe 45 has a shape in which a midway portion is bent at a substantially right angle in plan view.

  The intercooler 21 is provided on the left side of the front surface of the intake manifold 11. The intercooler 21 is provided on substantially the same straight line as the lubricating oil cooler 25 to be connected, with its longitudinal direction being the left-right direction. The cooling passage 21 b of the intercooler 21 has an inlet formed on the left side of the intercooler 21 and an outlet formed on the right side of the intercooler 21. The outlet of the cooling passage 21 b is connected to the inlet of the cooling passage of the lubricating oil cooler 25 through the connection pipe 46.

  The lubricating oil cooler 25 is arranged in series on the right side of the front surface of the cylinder block 2 on the same straight line as the intercooler 21. The lubricating oil cooler 25 has a lubricating oil pipe through which lubricating oil flows and a cooling passage formed around the lubricating oil pipe. The inlet of the cooling passage is formed on the left side of the lubricating oil cooler 25, and the outlet of the cooling passage is formed on the right side of the lubricating oil cooler 25. The outlet of the lubricating oil cooler 25 is connected to an inlet formed on the front surface of the fresh water cooler 22 via a connection pipe 47.

  The fresh water cooler 22 is provided on the right surface of the cylinder block 2 so as to be positioned above the lubricating oil cooler 25. The inlet into which the seawater of the fresh water cooler 22 flows is provided on the front surface of the fresh water cooler 22, and the outlet is formed above the front inlet of the fresh water cooler 22.

  The connecting pipe 47 that connects the lubricating oil cooler 25 and the fresh water cooler 22 is a pipe having a bent middle portion. From the inlet of the connecting pipe 47 to the middle part, it is provided on the same straight line where the intercooler 21 and the lubricating oil cooler 25 are arranged. From the middle part of the connecting pipe 47 to the outlet, it extends rearward and upward so as to be substantially perpendicular to the same straight line.

The intercooler 21 and the lubricating oil cooler 25 that are heat exchangers are provided in series on the same straight line on the front surface of the cylinder block 2. And the fresh water cooler 22 which is a part of heat exchanger is provided in the right side of the cylinder block 2, and the inlet and outlet for cooling water are formed in the front side.
Therefore, the connection pipes 46 and 47 for connecting the heat exchanger are arranged so as to be concentrated on the front side of the cylinder block 2 without surrounding the entire circumference of the engine.

  Further, a seawater pump 24 that pumps seawater as cooling water to these heat exchangers (intercooler 21, lubricating oil cooler 25, and fresh water cooler 22) is a front side of the left side surface of the cylinder block 2 that is in the vicinity of the fresh water cooler 22. Is provided. And the discharge port which discharges the seawater which is cooling water is formed in the front side (intercooler 21 side). Accordingly, the connecting pipes 45, 46, and 47 including the connecting pipe 45 are arranged so as to be concentrated on the front side of the cylinder block 2 without surrounding the entire circumference of the engine 1.

  In the engine 1 of this embodiment, the discharge port of the seawater pump 24, the intercooler 21, the lubricant cooler 25, and the inlet of the fresh water cooler 22 are provided on the front side (one side). Therefore, the connecting pipes 45, 46, and 47 that connect them to each other can be configured to be shorter.

  Like the engine 1 of this embodiment, the connection pipe 46 which is piping for cooling can be shortened by connecting a heat exchanger (the intercooler 21 and the lubricating oil cooler 25) in series. Further, since the connecting pipes 46, 46 and 47 are provided on the front side which is one side of the engine, the connecting pipes 45 and 47 can be further shortened. Therefore, it is possible to reduce the complexity of the weight and appearance of the entire engine 1 and to reduce the pressure loss of the cooling water. Since the cooling connection pipes 45, 46, and 47 can be shortened, the weight of the entire engine 1 is reduced, the power weight ratio is improved, and the output characteristics are improved. Moreover, since the pressure loss of the seawater which is cooling water can be reduced, the force pumped by the seawater pump 24 can be reduced, leading to improvement of fuel consumption characteristics.

  Since the intercooler 21 and the lubricating oil cooler 25 that are heat exchangers are arranged in the longitudinal direction of the engine 1, the heat exchangers can be connected in series by the connecting pipe 46 without difficulty.

  Next, the above-described cooling water system will be described with reference to FIG. 6 regarding a connecting pipe that introduces and discharges cooling water to the engine 1 from a separate route. Here, the cooling water from a separate route is referred to as “third cooling water” and will be described below. The third cooling water may be seawater or fresh water.

  The third cooling water flowing into the engine body is introduced into the cylinder block 2 of the engine body via the introduction pipe 61. The introduction pipe 61 is disposed so as to protrude from the right side surface of the cylinder block 2 of the engine body. The introduction side end (right end) of the introduction pipe 61 is supported on the upper part of the water pump 23 via a spacer.

  The third cooling water discharged to the outside of the engine 1 is discharged to the outside of the engine 1 through the discharge pipe 62 communicating with the fresh water connection pipe 41.

  The flange portion 42 of the fresh water connection pipe 41 is connected to the fresh water outlet 22 b provided at the lower portion of the fresh water cooler 22. This flange part 42 is for connecting and fixing the fresh water connection pipe 41 for flowing fresh water to the fresh water cooler 22 normally. The flange portion 42 of the present embodiment is a connecting member configured to be separable from the fresh water connection pipe 41, and a fresh water passage 42a communicating in the vertical direction is formed. The upper end of the fresh water passage 42 a is a first inlet 42 b through which fresh water flows, and is connected to the outlet 22 b of the fresh water cooler 22. A first outlet 42c that discharges fresh water is formed at the lower end of the fresh water passage 42a, and a fresh water connection pipe 41 is connected thereto. By inserting the lower end of the flange part 42 into the upper end part of the fresh water connection pipe 41 via the O-ring, the flange part 42 and the fresh water connection pipe 41 become integral.

  A second outlet 42 d for connecting the discharge pipe 62 is formed on the front surface of the flange portion 42. In the flange part 42, the discharge path 42e is formed from the second outlet 42d to the fresh water passage 42a backward. The discharge passage 42e is connected to the fresh water passage 42a at a right angle and communicates with the fresh water passage 42a.

  The discharge pipe 62 is formed by a pipe bent at a gentle right angle in plan view. The discharge port 62a of the discharge pipe 62 faces the right outer side of the engine 1, and a flange is formed on the outer peripheral portion so that a guide pipe outside the engine 1 can be easily connected. The upstream end (inlet side) end of the discharge pipe 62 is connected to the second outlet 42 d of the flange portion 42. That is, the upstream side of the discharge pipe 62 is connected at right angles to the fresh water passage 42a of the flange portion.

  The third cooling water introduced into the engine main body is introduced into the fresh water cooler 22 through the same route as the fresh water. Then, the third cooling water is introduced from the outlet 22 b of the fresh water cooler 22 to the flange portion 42. Then, without passing through the water pump 23, it passes through the second outlet 42d and passes from the discharge pipe 62 to the discharge port 62a. Then, it flows into the guide pipe outside the engine 1 connected to the discharge port 62 a of the discharge pipe 62 and is discharged to the outside of the engine 1.

  In the engine 1 of the present embodiment, the heat exchanger has a fresh water cooler 22 in which fresh water that cools the engine body is cooled, and a water pump 23 that pumps fresh water from the fresh water cooler 22 to the engine body; A fresh water connection pipe 41 that connects the fresh water cooler 22 and the water pump 23, and a flange portion 42 is formed at an end of the fresh water connection pipe 41. In addition, a discharge pipe 62 for discharging cooling water separately introduced into the engine body to the outside of the engine 1 is connected.

  By connecting the discharge pipe 62 to the flange portion 42 of the fresh water connection pipe 41 in this way, a special connection member is not provided, and further, the entire fresh water connection pipe 41 is not enlarged without increasing the outer shape of the entire engine 1. Can be shortened. Furthermore, since no special connection member is provided, an extra space is created, and the exhaust pipe 62 and the like can be arranged without difficulty, and the space can be effectively used such that maintenance work is facilitated.

  The discharge pipe 62 is connected to the flange portion 42 at a right angle to the flow direction of the fresh water flowing through the fresh water connection pipe 41.

  Thus, the introduction pipe 61 can be connected to the flange part 42 without difficulty by connecting the introduction pipe 61 to the flange part 42 at right angles to the flow direction of the fresh water flowing through the fresh water connection pipe 41.

DESCRIPTION OF SYMBOLS 1 Engine 21 Intercooler 21a Intake passage 21b Cooling passage 21c Intake inlet 21d Intake outlet 25 Lubricating oil cooler 41 Connection pipe (fresh water connection pipe)
42 Flange 61 Inflow pipe

Claims (4)

An engine comprising a plurality of heat exchangers that are cooled by cooling water,
The connection pipe connecting the plurality of heat exchangers connects the plurality of heat exchangers in series and is provided on one side of the engine.   The engine according to claim 1, wherein the plurality of heat exchangers are provided on the same straight line in the longitudinal direction of the engine. The plurality of heat exchangers include a fresh water cooler in which fresh water for cooling the engine body is cooled,
A water pump for pumping fresh water from the fresh water cooler to the engine body;
A fresh water connection pipe connecting the fresh water cooler and the water pump;
At the end of the fresh water connection pipe, a flange is formed,
The engine according to claim 1 or 2, wherein a discharge pipe for discharging cooling water introduced into the engine main body to the outside of the engine separately from the fresh water is connected to the flange portion. .   The engine according to claim 3, wherein the discharge pipe is connected to the flange portion at a right angle to a flow direction of the fresh water flowing through the fresh water connection pipe.

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