JP2001132564A - Engine work machine with soundproof case - Google Patents

Abstract

(57) [Summary] [Problem] To improve heat efficiency by suppressing heat loss. An engine working machine includes an engine 2, a generator 3 driven by the engine 2, and an exhaust heat recovery device that recovers exhaust heat of the engine 2 by circulating a heat medium. It is housed in the soundproof case 13. The interior of the soundproof case 13 is vertically divided by a partition wall 100 to form two rooms. In the room below, Engine 2, Generator 3,
Further, an exhaust heat recovery device such as the exhaust heat exchanger 9 is accommodated, and the air cleaner 7 and the electric control device 26 are accommodated in the upper room. The fuel and the combustion air are supplied to the engine 2 housed in the lower room via the upper room and the pipe means penetrating the partition wall 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an engine working machine with a soundproof case, and more particularly to an engine working machine with a soundproof case having an exhaust heat recovery device for an engine.

[0002]

2. Description of the Related Art In recent years, the necessity of protecting the global environment has been publicized, and power generation, hot water supply, and the like using a gas engine or the like that uses city gas or the like as a power source have been promoted. Attention has been paid to an apparatus that collects and uses the heat generated thereby. In a working machine having an engine exhaust heat recovery device such as a cogeneration device of this type, the entire device is often covered with a soundproof case in consideration of the operation noise to the surrounding environment.
For example, Japanese Utility Model Publication No. 7-46741 discloses a work machine in which a ventilation fan and a ventilation port for cooling electrical equipment such as control equipment housed together with an engine in a soundproof case are devised. Is disclosed.

[0003]

However, it is important how to increase the heat recovery rate in the exhaust heat recovery apparatus. Therefore, lowering the temperature by ventilating the inside of the soundproof case in which the engine is housed leads to an increase in heat loss from the viewpoint of efficient recovery of exhaust heat of the engine. There is also a problem that driving the ventilation fan increases the energy consumption for the operation of the exhaust heat recovery device itself. Furthermore, especially in a small cogeneration device for home use or the like that requires quietness, the wind noise itself of the ventilation fan tends to be a noise source.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent the temperature around the exhaust heat recovery device of the engine from lowering and prevent the temperature around the electrical equipment from rising. It is an object of the present invention to provide an engine working machine with a soundproof case that can be used.

[0005]

SUMMARY OF THE INVENTION The present invention comprises an engine,
A work machine driven by the engine and an exhaust heat recovery device that recovers the exhaust heat of the engine by circulating a heat medium are accommodated in a soundproof case, and the recovered heat is supplied to the outside of the soundproof case. In engine working machine with soundproof case,
A partition wall that partitions the interior of the soundproof case up and down to form two rooms is provided, and the engine, the working machine, and the exhaust heat recovery device are housed in one of the two rooms,
The other is to house an air cleaner, a fuel supply system and an electric control device, and to have a pipe means for supplying fuel and combustion air to the engine housed in the one room via the other room. There is one feature.

According to the first feature, the room accommodating the high-temperature portion such as the engine is isolated from the room accommodating the control device and the like, so that the temperature of the room accommodating the engine is controlled. There is no need to lower the temperature of the device to an appropriate temperature. Therefore, the heat loss due to this can be suppressed, and the efficiency of heat recovery by the heat medium can be increased.

Further, according to the present invention, the one room is arranged in a lower stage and the other room is arranged in an upper stage, an air intake hole is provided in a bottom portion of the lower room, and an air intake hole is formed in an upper portion of the lower room. The second feature is that the discharge port is provided. According to the second feature, since the air taken in from the air intake port moves upward by natural convection and is discharged from the air discharge port, natural ventilation is performed.

Further, according to the present invention, a box-shaped ventilator is provided at an upper portion of the lower room, and the ventilator has an air inlet and a labyrinth structure connected to the air inlet. A third feature is that an outlet is connected to the air discharge port. According to the third feature, the labyrinth structure can significantly reduce the operating noise leaking from the air discharge port.

The present invention further includes an exhaust heat exchanger for recovering heat from the exhaust of the engine, wherein the engine is a vertical type having a crankshaft set vertically, and the working machine is configured to extend the crankshaft. A fourth feature is that the exhaust heat exchanger is arranged below the engine while being disposed on the upper side. According to the fourth feature, the installation area of the device is reduced by the vertical arrangement. can do.

Further, the present invention provides a heat medium circuit of the exhaust heat recovery device and an external heat medium circuit connected by joints provided at least at two places of the soundproof case. A fifth feature is that a pipe connected in parallel in a room of the soundproof case in which the exhaust heat recovery device is accommodated is provided. In the pipe, a high temperature side of the pipe is the engine and the exhaust heat exchange. There is a sixth feature in that it is arranged near the vessel.

According to the fifth and sixth features, the heat medium can be circulated to the outside by selectively using the joints provided at at least two places. Various positional relationships can be set. Since such various positional relationships are possible, the amount of external piping can be reduced, and the heat loss can be reduced. In particular, according to the sixth feature, heat radiation from this pipe can be reduced by installing a high-temperature pipe near an engine, an exhaust heat exchanger, or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an exhaust heat recovery device included in the cogeneration device. The exhaust heat recovery device 1 is configured to recover exhaust heat from the engine section of the engine generator. The exhaust heat recovery device 1
It consists of two upper and lower rooms separated by a partition plate 100, and the two rooms are separated from each other by the partition plate 100. Of the two rooms, an engine 2 and a generator 3 mechanically connected to and driven by the engine 2 are provided in a lower room. The generator 3 generates AC power according to the engine speed. The engine 2 is provided with an oil pan 4 for storing lubricating oil. An oil cooler (oil heat exchanger) 5 is connected to the oil pan 4, and the oil heat exchanger 5 exchanges heat between oil in the oil pan 4 and a heat medium (cooling water).

In the room above the engine 2 which is isolated from the room in which the engine 2 is housed and is hardly affected by the heat of the engine 2,
The air cleaner 7 and electric equipment such as the battery 25 and the ECU 26 are provided. Air is taken into the cylinder head 6 of the engine 2 from the air cleaner 7. Exhaust gas from the engine 2 passes through the exhaust manifold 8 and the exhaust heat exchanger 9, and is discharged to the outside via the silencer 31.

A circulation path 12 for a heat medium for efficiently recovering the heat generated in the engine 2 is provided. A water pump 10 for circulating the heat medium is provided on the inlet side of the heat medium circulation path 12. With this arrangement, contact with a high-temperature heat medium is avoided, so that the seal member and the like are hardly deteriorated, and the life of the water pump 10 is extended. The heat medium supplied by the water pump 10 is circulated to an external heat load through the oil heat exchanger 5, the exhaust heat exchanger 9, the engine 2, the cylinder head 6, and the thermo cover 16 in the oil pan 4 in this order. The thermo cover 16 has a built-in thermostat. When the temperature is lower than a preset temperature, the valve is closed to prevent the temperature of the cylinder from being lowered by the heat medium.

The heat generated in the engine 2 is recovered by the heat medium circulating in the circulation path 12 and supplied to the heat load. That is, the heat medium is introduced into the oil heat exchanger 5 in the oil pan 4 and exchanges heat with the oil recovered from the engine 2 to cool the oil and obtain heat therefrom. Subsequently, the heat medium exchanges heat with the exhaust gas from the engine 2 in the exhaust heat exchanger 9 to obtain heat. The heat medium whose temperature has been increased by obtaining heat in the oil heat exchanger 5 and the exhaust heat exchanger 9 is further supplied to a cooling section and a cylinder head formed by a pipe provided in the cylinder wall of the engine 2 and the cylinder head 6, that is, a water jacket 6A. Heat is recovered through 6 and its temperature is further increased.

FIG. 2 is a right perspective view showing the appearance of the exhaust heat recovery apparatus, and FIG. 3 is a left perspective view of the same. 2 and 3, the exhaust heat recovery device 1 is covered by a soundproof case 13 including an upper plate 13A, a bottom plate 13B, and a side plate 13C. Leg 14 is provided on bottom plate 13B, and side plate 13C is provided.
On the right side are provided an electric input / output terminal 15, a handle 17, and the like. Further, holes are formed in the right side of the side plate 13C through which the heat medium inlet pipe 18, the heat medium outlet pipe 19, the condensed water drain pipe 20, and the fuel gas inlet pipe 21 respectively penetrate. Holes through which the intake pipe 22 and the exhaust pipe 23 respectively penetrate are formed in the upper plate 13A.

An input control panel 15A and a handle 17A are provided on the left side of the side plate 13C. Furthermore, side plate 1
On the left side of 3C, there are formed holes through which the heat medium left inlet pipe 47 and the heat medium left outlet pipe 48 connected to the heat medium inlet pipe 18 and the heat medium outlet pipe 19 respectively. The heat medium inlet pipe 18 and the heat medium left inlet pipe 47, and the heat medium outlet pipe 19 and the heat medium left outlet pipe 48 are connected by hoses, respectively, which will be described later. It is possible. In FIG. 3, since the heat medium is set to be taken in and out from the right side, the heat medium left inlet pipe 47 and the heat medium left outlet pipe 48 are closed with plugs.

Next, the internal structure of the exhaust heat recovery apparatus 1 will be further described. 4 is a front view of the exhaust heat recovery apparatus with a part of the case removed, FIG. 5 is a right side view, FIG. 6 is a left side view, and FIG. 7 is a top view. 4 to 7, an air cleaner 7, a battery 25,
An ECU 26, an AVR 52, and a fuel gas pressure regulator 53 (FIG. 7) are arranged.
However, the engine 2 is arranged in the middle part.
The engine 2 is a vertical type in which a crankshaft (not shown) is set vertically, and a generator 3 is mounted on the crankshaft.
And an oil pan 4 is arranged below the engine 2. A mixer 27 is provided above the cylinder head of the engine 2. The mixer 27 is connected to an intake hose 28 extending from the air cleaner 7 and a gas pipe 29 extending from the fuel gas inlet pipe 21 through the pressure regulator 53. Have been.

A right stay 30 is provided on the bottom plate 13B along the side plate 13C. The heating medium inlet pipe 18, the heating medium outlet pipe 19, and the condensed water drain pipe 20 are attached to the right stay 30. A silencer 31 that absorbs exhaust noise from the exhaust heat exchanger 9 is provided along the right stay 30. Silencer 31
Is connected to the exhaust pipe 23, and the intake pipe 22 is connected to the air cleaner 7. The silencer 31 is provided with a curved pipe portion 32 on the inlet side, and the exhaust gas from the exhaust heat exchanger 9 is introduced into the silencer 31 through the curved pipe portion 32.

As described above, the engine 2 is of a vertical type, and the generator 3 as a working machine is connected to the crankshaft arranged on the vertical axis, and the exhaust heat exchanger 9 is located below the horizontally lying cylinder of the engine 2. They are arranged and set to be vertically long as a whole. Therefore, the installation area can be reduced, and ventilation by natural convection, which will be described later, can be performed efficiently.

A ventilation device 110 is provided on a lower surface of the partition plate 100. As described later with reference to FIG. 10 and the like, the ventilator 110 includes a labyrinth structure for discharging air taken in from an air intake hole provided in the bottom plate 13B of the soundproof case 13 to the outside of the soundproof case 13.

FIG. 8 is an exploded perspective view showing the piping of the exhaust system. In the figure, the outlet fitting 91 of the exhaust heat exchanger 9
The other end of the exhaust hose 33 having one end connected to the first joint 3 in which the heat medium inlet pipe 18 is integrally formed.
4 is connected to the base 341. Further, a silencer inlet hose 35 connected to the exhaust hose 33 via a first joint 34 is connected to an inlet end 321 of a curved pipe portion 32 formed in a stage preceding the silencer 31. Silencer 3
A silencer outlet hose 39 connected to the exhaust pipe 23 is connected to an upper portion of the first pipe.

The drain hose 36 extended from the outlet end 311 of the silencer 31 is connected to the base 3 of the first joint 34.
42. Further, a drain outlet hose 37 connected to the drain hose 36 via a first joint 34 is connected to a second joint 38 in which the condensed water drain pipe 20 is formed. Drain hose 36
The drain outlet hose 37 constitutes a drain trap which extends downward from the silencer 31 and rises upward therefrom. The condensed water accumulated in the drain trap prevents the exhaust gas in the silencer 31 from flowing into the drain trap, and facilitates the exhaust gas to be discharged upward. The first joint 34, the second joint 38, and the silencer 31 are fixed to the right stay 30 (see FIG. 9).

The exhaust gas introduced from the engine 2 to the exhaust heat exchanger 9 exchanges heat with a heat medium to lower the temperature. When the temperature decreases, condensed water is generated, and the condensed water is discharged from the exhaust heat exchanger 9 together with the exhaust gas. The exhaust gas accompanied by the condensed water is introduced into the curved pipe section 32 through the exhaust hose 33, the first joint 34, and the silencer inlet hose 35 (arrows A and B).

Exhaust gas and condensed water are separated at the joint 40 between the curved pipe portion 32 and the silencer 31, and the exhaust gas is separated by the silencer 3.
1 and the exhaust pipe 23 through the silencer outlet hose 39
Guided to the outside. On the other hand, the condensed water separated from the exhaust gas passes through a drain hose 36, a first short 34, and a drain outlet hose 37 to a second joint 38.
And is discharged from the condensed water drain pipe 20 (arrows C and D).

FIG. 9 is an exploded perspective view showing the piping of the heat medium circulation system. In the figure, a left stay 41 is provided opposite to the right stay 30. The left stay 41 is also erected on the bottom plate 13B similarly to the right stay 30. A fourth joint 43 having a heat medium left inlet pipe 47 formed therein is attached to a lower portion of the left stay 41, and a first joint 34.
And the fourth joint 43 are connected by a heat medium inlet connection hose 42.

A third joint 44 in which the heat medium outlet pipe 19 is formed is provided at an intermediate portion of the right stay 30, and a fifth joint 44 in which a heat medium left outlet pipe 48 is formed above the left stay 41. 46 are provided. The third joint 44 and the fifth joint 46 are connected by a heat medium outlet communication hose 45.

The fourth joint 43 and the fifth joint 46 are provided so that the heat medium inlet and the heat medium outlet can be taken from either the left or right side of the exhaust heat recovery apparatus 1.
When the heat medium inlet and the heat medium outlet are taken from the right side of the exhaust heat recovery device 1, the heat medium left inlet pipe 47 and the heat medium left outlet pipe 48 are closed by plugs 49 and 50, respectively. Similarly, when the heat medium inlet and the heat medium outlet are taken from the left side of the exhaust heat recovery device 1, the heat medium left inlet pipe 47 and the heat medium left outlet pipe 48 are opened, and the heat medium inlet pipe 18 and the heat medium The outlet pipe 19 is closed.

Since the heat medium inlet / outlet connecting hoses 42 and 45 are routed in a relatively high temperature area around the engine 2 and the exhaust heat exchanger 9, heat is radiated from the hoses 42 and 45. Can be reduced. Therefore, it is possible to prevent a decrease in the temperature of the heat medium whose temperature passing through the heat medium outlet communication hoses 42 and 45 is increased, and to enhance the thermal efficiency.

The first joint 34 has an oil heat exchanger 5
Cooler inlet hose 54 for introducing heat medium to the
The third joint 44 is connected to an engine outlet hose 51 extended from the cooling section of the engine 2.

As described above, since the inlet and outlet for the heat medium are provided on both sides of the case 13, the degree of freedom in the arrangement with respect to the external heat load and the heat storage device connected to the exhaust heat recovery device is increased, and the external heat load and the heat storage device are increased. The heat loss is small because the piping can be shortened. Further, since the communication hoses 42 and 45 for connecting the left and right inlets and the outlet are provided in the case 13 which is a relatively high temperature environment, heat loss from these hoses 42 and 45 can be reduced.

Next, the ventilation device 110 will be described in detail. FIG. 10 is a perspective view of the ventilation device 110, and FIG. 11 is a plan view of the same. The ventilation device 110 has a dish shape, and its upper part is closed by the partition plate 100. An air inlet 111 is provided at one end of the four walls of the ventilator 110, and an inlet 111 is provided at a wall facing the wall provided with the inlet 111.
An air outlet 112 is formed at a position far from the air outlet. Obstacle plates 113 and 114 are provided upright between the inlet 111 and the air outlet 112 to form a labyrinth structure so that the inlet 111 and the air outlet 112 do not conduct linearly. Therefore, the air introduced from the inlet 111 flows as shown by the arrow (FIG. 11) and flows out from the outlet 112.

FIG. 12 is a perspective view of the soundproof case 13 having the ventilation device 110, and FIG. 13 is a rear view of the soundproof case 13. The ventilation device 110 is fixed to the lower surface of the partition plate 100. The air intake hole 5 is provided in the bottom plate 13B of the case 13.
5 is provided, and an outlet 56 is formed on the back surface of the case 13 at a position facing the outlet 112 of the ventilator 110. With this configuration, outside air is taken into the case 13 from the air intake hole 55. In the lower room in the case 13 in which the engine 2 is housed, since the room temperature is high, the air is convected upward from below. The air convected upward is introduced into the ventilator 110 from the inlet 111, passes through the labyrinth, and the outlet 112 and the case 1
The air is discharged from the third outlet 56 to the outside.

As described above, the upper room of the case 13 in which the electric equipment and the like are installed is hardly affected by the heat from the lower room in which the engine 2 and the like are installed by the partition plate 100. On the other hand, in the lower room, ventilation is performed by natural convection, and unlike forced ventilation, it is possible to prevent the room temperature from unnecessarily lowering, so that the efficiency of exhaust heat recovery does not decrease. Furthermore, unlike the forced ventilation, wind noise of the ventilation fan does not occur, and energy for operating the ventilation fan is not required.

In the present embodiment, the interior of the soundproof case is divided into a relatively high-temperature room in which an engine and the like are housed and a room in which electrical equipment and the like are installed, but the flow of air between these two rooms is limited. As long as the room is shut off, the room is not necessarily divided vertically and may be two horizontally separated rooms.

The power driven by the engine 2 is not limited to the generator, but may be another working machine driven by the engine.

[0037]

As is apparent from the above description, according to the first aspect of the present invention, the temperature of the room in which the heat recovery device of the engine is housed can be maintained at a relatively high temperature, so that heat loss can be suppressed. Thermal efficiency can be increased.

According to the second and third aspects of the present invention, since ventilation is by natural convection, wind noise caused by the ventilation fan can be eliminated, and driving energy of the ventilation fan can be saved. In particular, according to the third aspect of the present invention, it is possible to reduce leakage of driving noise.

According to the fourth aspect of the present invention, the installation area of the apparatus can be reduced by the vertically long arrangement, and smooth convection upward from the bottom surface is possible.

According to the fifth and sixth aspects of the present invention, the positional relationship with the external heat load and the like can be variously set, so that the amount of the external piping routed can be reduced and the heat loss can be reduced. In particular, according to the invention of claim 6, heat radiation from this pipe can be reduced by installing a high-temperature pipe near an engine, an exhaust heat exchanger, or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main configuration of an exhaust heat recovery device according to an embodiment of the present invention.

FIG. 2 is a right external perspective view of the exhaust heat recovery device.

FIG. 3 is a left external perspective view of the exhaust heat recovery device.

FIG. 4 is a front view of the exhaust heat recovery device with a case removed.

FIG. 5 is a right side view of the exhaust heat recovery device with a case removed.

FIG. 6 is a left side view of the exhaust heat recovery device with a case removed.

FIG. 7 is a top view of the exhaust heat recovery device with a case removed.

FIG. 8 is an exploded perspective view showing a passage of exhaust gas discharged from the exhaust heat exchanger.

FIG. 9 is an exploded perspective view showing a main part of a circulation path of a heat medium.

FIG. 10 is a perspective view of a ventilation device.

FIG. 11 is a plan view of a ventilation device.

FIG. 12 is a perspective view of a soundproof case.

FIG. 13 is a rear view of the soundproof case.

[Explanation of symbols]

1. Exhaust heat recovery device, 2. Engine, 3. Generator,
4 ... oil pan, 5 ... oil heat exchanger, 7 ... air cleaner, 9 ... exhaust heat exchanger, 10 ... heat medium pump, 12 ... circulation path, 13 ... soundproof case, 18 ...
Heat medium inlet pipe, 19 ... Heat medium outlet pipe, 20 ...
Condensate drain pipe, 22 ... intake pipe, 23 ... exhaust pipe, 26 ... ECU, 28 ... intake hose, 29 ...
Gas pipe, 31 ... silencer, 100 ... partition plate,
110… ventilator

Claims (6)

[Claims] An engine, a working machine driven by the engine, and an exhaust heat recovery device that recovers the exhaust heat of the engine by circulating a heat medium in a soundproof case, and recovers the recovered heat. An engine working machine with a soundproof case that is supplied to the outside of the soundproof case, wherein a partition wall that partitions the inside of the soundproof case up and down to form two rooms is provided, and the engine and the working machine are provided in one of the two rooms. , And the exhaust heat recovery device,
A soundproof case that houses a fuel supply system and an electric control device, and further includes a pipe unit that supplies fuel and combustion air to the engine housed in the one room via the other room. With engine working machine. 2. The method according to claim 1, wherein the one room is arranged in a lower stage, and the other room is arranged in an upper stage. The engine working machine with a soundproof case according to claim 1, wherein: 3. A box-shaped ventilation device is provided at an upper part of the lower room, wherein the ventilation device has an air inlet and a labyrinth structure connected to the air inlet, and an outlet of the labyrinth structure is provided with the air. The engine working machine with a soundproof case according to claim 2, wherein the engine working machine is connected to the discharge port. 4. An exhaust heat exchanger for recovering heat from exhaust of the engine, wherein the engine is a vertical type having a crankshaft set vertically, and the working machine is disposed on an extension of the crankshaft. The engine working machine with a soundproof case according to any one of claims 1 to 3, wherein the exhaust heat exchanger is arranged below the engine. 5. A heat medium circuit of the exhaust heat recovery device and an external heat medium circuit are connected by joints provided in at least two places of the soundproof case. The engine working machine with a soundproof case according to any one of claims 1 to 4, further comprising a pipe connected in parallel in a room in which the exhaust heat recovery device is housed. 6. The engine working machine with a soundproof case according to claim 5, wherein a high-temperature side of the pipe is disposed near the engine and the exhaust heat exchanger.