JPH0299749A - Ventilating device for soundproof type engine working machine equipped with engine waste heat recovering device - Google Patents

Abstract

PURPOSE:To reduce the installation area and facilitate maintenance by arranging a radiator, an engine, a water pump, and two units of radiator fans on the upper side of a soundproof case. CONSTITUTION:An engine 2 and a working machine 3 are arranged in a soundproof case 1. A radiator 4, water pump 6 for allowing the cooling water to circulate in the engine 2, waste heat recovering device 5 and the radiator 4, and two units radiator fans 7 for compulsorily feeding air onto the radiator 4 are arranged on the upper side of the soundproof case 1. A ventilating inlet 8 and a ventilating outlet 9 are formed on the soundproof case 1, and a ventilating fan 10 is arranged on the soundproof case 1. The ventilating fan 10 is directly connected with the revolution shaft 11 of the engine 2. Therefore, the installation ares can be reduced, and maintenance can be facilitated.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a ventilation system for a soundproof engine working machine equipped with an engine exhaust heat recovery device, and in particular, the installation area of the soundproof engine working machine can be reduced, and the radiator Engine exhaust heat that reduces the noise generated by the fan, facilitates maintenance and energy-saving operation, and significantly increases the durability of the power transmission mechanism that transmits engine rotational force to the ventilation fan. This invention relates to a ventilation system for a soundproof engine working machine with a recovery device.

<Prior Art> Conventionally, as an engine working machine equipped with an engine exhaust heat recovery device, there is one disclosed in US Pat. No. 4,226,214, for example. In this conventional example, an exhaust heat exchanger is provided to absorb engine exhaust heat into engine cooling water, and the engine cooling water heated by engine cooling and exhaust cooling is guided to an engine exhaust heat recovery device, a heating device, It is configured to heat a heat medium that transfers heat to a heat load device such as a water heater or a steam generator. In order to speed up the rise in hot water temperature during cold starts, etc., a bypass waterway is provided in the engine cooling waterway that bypasses the engine exhaust heat recovery device, and a thermo valve installed in this bypass waterway adjusts the temperature of the engine cooling water to a predetermined level. When the temperature is below this value, the engine cooling water is configured to bypass the engine exhaust heat recovery device and circulate.

According to the above conventional example, when the temperature of the engine cooling water exceeds a predetermined value, heat is transferred to the heat load device via the engine exhaust heat recovery device, and the engine exhaust heat that was previously wasted is effectively used. Available for

However, some heat load devices, such as water heaters, are not always operated at full load, and during partial load or no-load operation, the amount of heat exchanged by the engine exhaust heat recovery device is small, so the engine is cooled. The water temperature is high (
This may cause the engine to overheat.

Therefore, an engine exhaust heat circuit with an engine exhaust heat recovery device interposed in the engine cooling waterway and a radiator circuit with a radiator interposed in parallel with the bypass waterway are provided, and a cutoff valve is provided in the radiator circuit and the engine exhaust heat circuit,
Alternatively, a configuration has been considered in which a three-way valve is provided at these branch points so that a small amount (or a portion of the engine cooling water) is circulated to the radiator circuit when the engine cooling water temperature reaches a predetermined value, for example, 70° C. or higher.

According to this configuration, when the heat load of the heat load device is in partial load or no-load operation, the amount of heat exchange at the engine exhaust heat recovery device becomes small, and when the temperature of the engine cooling water becomes higher than a predetermined value, the engine cooling At least a portion of the water is circulated through the radiator circuit, and heat dissipation in the radiator prevents the temperature of the engine coolant from increasing further. As a result, overheating of the engine at partial load or no load is prevented.

By the way, in general soundproof engine work equipment, the engine, work equipment, radiator, and radiator fan are arranged in a soundproof case, and the structure is such that the noise generated by the engine, work equipment, and radiator fan is not dissipated to the surroundings. There is. In this case, the radiator and radiator fan are placed on the front or side of the engine. Also,
The radiator is arranged higher than the crankshaft of the engine in correspondence with the height of the engine's water jacket, and the rotation center of the radiator fan is arranged at a height approximately at the center of the radiator. Furthermore, the radiator fan is often used as a ventilation fan for a ventilation system that ventilates the inside of the soundproof case so that heat does not accumulate inside the case. In this case, the ventilation fan device is composed of a radiator fan and a power transmission mechanism that transmits power from the rotating shaft of the engine such as the crankshaft to the radiator fan, and belt-type power transmission mechanisms are mainstream as this power transmission mechanism. It has become.

It is very easy to think of adopting the same configuration as such a general soundproof engine working machine to a soundproof engine working machine equipped with an engine exhaust heat recovery device.

<Problems to be Solved by the Invention> However, in a soundproof engine working machine equipped with an engine exhaust heat recovery device, when the radiator and the radiator fan are arranged in front or on the side of the engine, there is a problem that the installation area becomes large.

Furthermore, a large number of devices are disposed around the engine, which is disadvantageous in terms of facilitating maintenance.

Additionally, even when the load on the heat load device is large and there is no need to use the radiator to cool the engine coolant, the radiator fan must be operated to prevent heat from accumulating inside the soundproof case, resulting in energy savings. You will be at a disadvantage at the top.

Furthermore, ventilation fan devices that use a belt-type power transmission mechanism have a problem of relatively low durability because the durability of the power transmission mechanism is limited by the durability of the belt.

The present invention has been made in view of the above circumstances, and its purpose is to arrange a radiator, a radiator fan, and a water pump, which are peripheral devices of an engine, above the engine and a working machine, and to install a radiator fan. By using two pieces, the installation area of a soundproof engine working machine with an engine exhaust heat recovery device is reduced, the noise generated by the radiator fan is reduced, maintenance is facilitated, and ventilation inside the soundproof case is improved. The equipment fan is installed separately from the radiator fan of the radiator.
To enable energy-saving operation by stopping wasteful operation of a radiator fan, and to increase the durability of a ventilation fan device by directly connecting the ventilation fan to the rotating shaft of an engine.

<Means for Solving the Problems> In order to achieve the above object, the soundproof engine working machine with an engine exhaust heat recovery device according to the present invention has an engine installed in a soundproof case l, as shown in FIG. 2 and work equipment 3
and a radiator 4 on the upper side of the soundproof case 1,
A water pump 6 that circulates cooling water to the engine 2, the exhaust heat recovery device 5, and the radiator 4, and two radiator fans 7 that blow cooling air to the radiator 4 are installed, and the soundproof case l is equipped with a ventilation system. 8 and a ventilation outlet 9, and a ventilation fan 10 is arranged inside the soundproof case 1,
The ventilation fan 10 is characterized in that it is directly connected to the rotating shaft 11 of the engine 2.

<Function> In the present invention, the engine 2 and the working machine 3 are arranged inside the soundproof case 1, and the radiator 4 is placed above the soundproof case 1.
, a water pump 6 that circulates cooling water through the engine 2, the exhaust heat recovery device 5, and the radiator 4, and a radiator blower that blows cooling air to the radiator 4. The installation area is smaller than when the engine 2 and the working machine 3 are placed sideways. In addition, since there are two radiator fans 7 that force ventilation into the radiator 4, the outer diameter of each radiator fan 7 required to obtain the required air volume is smaller compared to a system with one radiator fan 7. By reducing the overall depth and/or width of the soundproof engine working machine with the engine exhaust heat recovery device, the installation area of the soundproof engine working machine with the engine exhaust heat recovery device can be further reduced.

Further, since there are two radiator fans 7, the circumferential speed of the outer periphery of the radiator fan 7 can be reduced, wind noise can be reduced even at high rotation speed, and noise generated by the radiator blower can be reduced.

In addition, since the radiator 4, water pump 6, and radiator armature are not arranged next to the engine 2 and work equipment 3 inside the soundproof case 1, the engine 2 and work equipment 3
Since the radiator 4, the water pump 6, and the radiator fan 7 are arranged above the soundproof case 1, the maintenance thereof is also facilitated.

Further, since the ventilation fan 10 is provided separately from the radiator amplifier, the radiator fan can be stopped for energy-saving operation when heat radiation by the radiator 4 is unnecessary.

Furthermore, since the ventilation fan 10 is provided separately from the radiator fan 7, the ventilation fan 10 can be directly connected to the rotating shaft 11 of the engine 2, thereby creating a power transmission mechanism that links the ventilation fan 10 to the rotating shaft 11 of the engine 2. By omitting this, the durability of the ventilation fan device can be significantly increased.

<Effects of the Invention> As explained above, according to the soundproof engine working machine with the engine exhaust heat recovery device of the present invention, the engine and the working machine are disposed within the soundproof case, and the radiator is placed above the soundproof case. By disposing a water pump and a radiator fan, the installation area can be reduced, and by using two radiator fans, the installation area can be further reduced and maintenance can be facilitated.

Further, by using two radiator fans, the noise generated by the radiator fans can be reduced.

In addition, a ventilation fan can be installed separately from the radiator fan, which allows energy-saving operation by stopping unnecessary radiator fan operation.In addition, the ventilation fan can be connected directly to the engine's rotating shaft, simplifying the configuration of the ventilation fan device. At the same time, its durability can be significantly improved.

<Example> Embodiments of the present invention will be described below based on the drawings.

1 to 4 show a soundproof engine generator with an engine exhaust heat recovery device according to an embodiment of the present invention, and FIG. 1 is a rear view. In the figure, 1 is a soundproof case, 2 is an engine, 3 is a generator as a working machine, 4 is a radiator, 5 is an exhaust heat recovery device, 6 is a water pump, 7 is a radiator fan, and 8 is an inlet as a ventilation inlet. 9 is an exit louver as a ventilation outlet, 10 is a ventilation fan, 11 is a crankshaft as a rotating shaft, 12 is an inlet soundproof duct, 1
3 is 1 air supply port, 14 is an air guide duct for heat-generating electrical components, 15
is a rear center pillar; 16 is an exit soundproof duct; 17 is an exhaust heat exchanger placed on the back side of the engine 2; 18 is an exhaust muffler; and 20 is an exhaust top.

The soundproof case 1 includes a header 21, back panels 22 and 23 that cover the left and right halves of the back, and side panels 24 and 25 that cover both the left and right sides, and the upper surface thereof is completely covered by the drain pan 26. covered.

The engine 2 and generator 3 are arranged side by side inside the soundproof case 1, and the left (right in Fig. 1) side panel 2
A control box 27 is arranged inside 4. Further, although not shown, a battery is disposed in a space above the generator 3 formed between the control box 27 and the upper part of the engine 2 within the soundproof case l.

FIG. 2 is a cross-sectional plan view taken along the line nn of FIG. 1, in which parts corresponding to those shown in FIG. 1 are given the same symbols and names as in FIG. 1.

Further, in the figure, reference numeral 28 indicates a partition wall surrounding the central portion of the drain pan 10 on all sides, and reference numeral 29 indicates a pump chamber surrounded by the partition wall 28. A radiator fan 7 and a radiator 4 are arranged on the left and right sides of the pump chamber 29, respectively. The radiator 4 is formed in a U-shape that surrounds the front, rear, right outer side, or left outer side of the radiator fan 7, respectively.

In the pump chamber 29, a radiator 4 or an exhaust heat recovery device 5 is connected from the water jacket of the engine 2.
a part of the high-temperature waterway 30 that supplies high-temperature water to the high-temperature waterway 30, a thermovalve 31 interposed in the high-temperature waterway 30, and a three-way valve that switches the high-temperature water supply destination to the radiator 4 or the exhaust heat recovery device 5 downstream of the thermovalve 31. 32, a bypass waterway 33 that returns low-temperature water from the thermovalve 3I to the water jacket of the engine 2, and a portion of the low-temperature waterway 34 that returns low-temperature water from the radiator 4 or the exhaust heat recovery device 5 to the water jacket of the engine 2; A water pump 6 is disposed at a portion of the low temperature water channel 34 downstream of the confluence of the cooling water supply port 35 communicating with the low temperature water channel 34, the confluence of the bypass water channel 33, and the connection point of the cooling water supply port 35. Further, in this pump chamber 29, an exhaust top 20 having a function as a final stage muffler is arranged.

As shown in FIG. 1, the upper sides of both radiators 4 and the pump chamber 29 are covered by a top panel 36, and each radiator fan 7 is connected to a holding frame 37 fixed to the bottom surface of the top panel 36 via a fan motor 38. It is supported so that it can rotate horizontally.

Next, the cooling air passage formed inside the soundproof case 1 will be explained.

FIG. 3 is a perspective view showing the cooling air passage, and in this figure, parts corresponding to the parts shown in FIG. 1 are given the same symbols and names as in FIG. 1.

As shown in FIGS. 1 and 3, an inlet looper 9 is provided at the upper part of the rear panel 22 on the left side (right side in the figure), and an inlet soundproof duct 12 is provided on the inner surface of the rear panel 22 extending from the upper part to the lower part. provided.

As shown in FIG. 3, the inlet soundproof duct 12 has an air supply port 1 opened on the left side of the lower part of the soundproof duct 12 in order to effectively cool the oil pan of the engine 1 located in the lower part of the soundproof case 1.
It has 3. In addition, in order to prevent heat from accumulating in the upper part of the soundproof case l by supplying cooling air to the upper part of the soundproof case 1 through the back center pillar 15, the right end face facing the back center pillar 15 is It has an open upper monthly air supply port 39. The main air supply loe 3 is opened across the front part facing the lower part of the generator 3 and the left side facing the air guide duct 14 for heat-generating electrical parts, and the upper monthly air supply port 39 faces the rear center pillar 15. It is opened at the bottom of the right side.

The air guide duct 14 has an inlet 40 that opens toward the first air supply port 13, and a pair of upper and lower outlets 41 and 42 that open toward the transformer and the power box, respectively, which are arranged on the front side of the air guide duct 14. The left end surface thereof is opened in the soundproof case l at a position slightly away from the left panel 24 in order to direct cooling air to the control box 27 through the left panel 24.

The back center pillar 15 is formed hollow, and an inlet 43 is opened at the lower part of the left side face opposite to the upper monthly air supply port 39, and an outlet communicating with the upper part of the soundproof case 1 is formed at the upper part thereof. .

An exit louver 9 is provided on the upper part of the right panel 25, and an exit soundproof duct 16 is provided on the inner surface of the right panel 25, extending downward from the exit louver 9. An inlet 44 that opens into the soundproof case 1 is opened on the right side of the exit soundproof duct 16. This population 44 is formed at a position coaxial with the crankshaft 11 of the engine 2.
Ventilation fan 1 directly connected to the rank shaft 11 near the right side of 4
0 is placed.

Although not shown, for example, rear center pillar 1
5 is provided with a baffle plate to prevent the cooling air from passing through the back side, so that the cooling air is sufficiently distributed to the front side as well.

Further, FIG. 4 is a front view of the operation panel provided on the left outer end surface of the control box 27, and in the same figure, 45
is a pilot lamp that is lit when the power is on; 46 is an abnormality notification lamp that is lit when an abnormality is detected; 47 is an operation command key that commands to start operation; and 48 is a command to stop operation. Stop key 49 is a remote control selection key that switches the control mode to a remote control mode using a remote controller, 50 is a side operation selection key that switches the control mode to a side operation mode using this operation panel, and 51 is activated when an abnormality occurs. 52 is a reset key that returns the control circuit to its initial state after an automatic stop due to an abnormality or a stop due to an emergency stop operation; 53 is a reset key that returns the actual measured values of voltage, current, and frequency, for example, ○OVJ, "Denryu○○A", [actual value display section that displays 00HzJ, etc., 54
55 is a setting for switching the control sequence to a control target value setting sequence and changing the display of the actual measured value display 53 to a set value display. Keys 56 is a plus setting key to increase the set value, 57 is a minus setting key to decrease the set value, 58 is a registration key to register the set value, 5
9 is a measurement key for switching the display contents of the actual measurement value display section to actual measurement values;
60 is a sequential key for manually switching the display contents of the actual measurement value display section 53 to one of voltage, current, and frequency display;
61 is an emergency stop switch.

In addition, when an abnormality occurs, the actual measurement value display section 53 displays the content of the abnormality, for example, "YURATSUTEIKA" or "SUIONJOSHO".
, "Kadenryu" is displayed.

According to this embodiment, an engine 2 and a generator 3 are arranged in a soundproof case 1, a radiator 4 and a water pump 6 are arranged above the soundproof case 1, and a radiator fan that blows cooling air to the radiator 4. 7, so
The installation area is smaller compared to the case where the radiator 4 and the radiator fan 7 are arranged sideways to the engine 2 and generator 3.

In addition, since there are two radiator blowers, the required air volume can be obtained with the radiator fan 7, which has a smaller outer diameter than a single radiator fan 7. By reducing the depth and width of the entire working machine, the installation area can be further reduced.

Furthermore, since there are two radiator armers, the circumferential speed of the outer periphery of the radiator fan 7 is reduced, wind noise can be reduced even at high rotational speeds, and the noise generated by the radiator fan 7 can be reduced.

In addition, since the radiator 4, water pump 6, and radiator armature are not placed next to the engine 2 and work equipment 3 inside the soundproof case l, the engine 2 and work equipment m3
Since the radiator 4, the water pump 6, and the radiator fan 7 are arranged above the soundproof case 1, the maintenance thereof is also facilitated.

Furthermore, since the ventilation fan 10 is provided separately from the radiator fan 7, when heat dissipation by the radiator 4 is unnecessary, the radiator fan can be stopped for energy-saving operation.

Furthermore, since the ventilation fan IO is provided separately from the radiator fan, the ventilation fan 10 can be directly connected to the rotating shaft 11 of the engine 2, thereby establishing a power transmission mechanism that links the ventilation fan 10 to the rotating shaft 11 of the engine 2. By omitting this, the durability of the ventilation fan device can be significantly increased.

In addition, in this embodiment, since the first air supply port 13 is opened at the lower part of the soundproof case 1, cooling air can be effectively supplied to the lower part of the soundproof case 1 to effectively blow the oil pan of the engine 2. Can be cooled.

In addition, an air guide duct 14 for heat-generating electrical components is connected from the first air supply port 13.
Cooling air can be blown onto transformers, high-power boxes, etc. through the cooling air filter to effectively cool heat-generating electrical parts such as transformers, high-power boxes, etc.

Furthermore, by supplying cooling air to the upper part of the soundproof case 1 through the rear center pillar 15, the upper part of the soundproof case 1 is effectively cooled, and heat is prevented from accumulating in the upper part of the soundproof case 1. can.

[Brief explanation of the drawing]

, FIG. 1 is a rear view, FIG. 2 is a cross-sectional plan view taken along the line ■-■ in FIG. 1, FIG. 3 is a perspective view showing the cooling air passage, and FIG. It is a front view of the provided operation panel. 1... Soundproof case, 2... Engine, 3... Generator, 4... Radiator, 5... Exhaust heat recovery device, 6...
...Water pump, 7...Radiator fan, 8.
...Inlet louvre, 9...Outlet louver, 10...Ventilation fan, 11...Crankshaft. Patent applicant: Kubota Iron Works Co., Ltd.
Mr. Hisashi Kitatani, Mr., Mr. J.

Claims (1)

[Claims] 1. The engine (2) and work equipment (3) are placed inside the soundproof case (1).
) is disposed above the soundproof case (1), and a radiator (4) is disposed above the soundproof case (1), and a water pump (
6) and two radiator fans (7) that provide forced ventilation to the radiator (6), and the soundproof case (1).
) is formed with a ventilation inlet (8) and a ventilation outlet (9), while a ventilation fan (10) is arranged inside the soundproof case (1),
A ventilation system for a soundproof engine working machine with an engine exhaust heat recovery device, characterized in that the ventilation fan (10) is directly connected to the rotating shaft (11) of the engine (2).