JPH01249917A - Cooling device for soundproof type water cooled engine - Google Patents

Abstract

PURPOSE:To reduce the dimension of a ventilating opening and suppress the confinement of hot air by forcibly ventilating the inside of a soundproof case into which a muffler is accommodated, by a radiator fan and a ventilating fan. CONSTITUTION:A ventilating fan 18 driven by the output of an engine 2 is installed at the intermediate height part on one side of the front part in an engine room A, and a muffler chamber C into which a muffler 11 is accommodated is installed in the vicinity. A radiator cooling air inlet is formed on the peripheral wall of a radiator chamber B. Only the time when the engine speed is in idling state and the engine temperature is below a set value, an electric motor 4 for driving a radiator fan 5 is automatically stopped. Therefore, the inside of a soundproof case 1 can be forcibly ventilated by the radiator fan 5 and ventilating fan 18, and the confinement of the hot air can be suppressed. Therefore, each dimension of the openings 22 and 25 for ventilation can be reduced, and the leak of the engine noise from the ventilating openings 22 and 25 can be reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a soundproof engine cooling device used in a soundproof engine generator, etc. A radiator and a radiator fan are installed, the engine's water jacket and radiator are connected in a circular manner through hot water pipes and cold water pipes, and a ventilation inlet is opened at the rear of the soundproof case and an exhaust port is opened at the front. The present invention relates to a cooling device for a soundproof water-cooled engine that includes a muffler housed in a soundproof case.

(Prior art) Conventionally, in the above-mentioned cooling system, only the radiator fan was used to cool the radiator and ventilate the inside of the soundproof case. After that, it passed through the radiator and was discharged to the outside of the exhaust port at the front of the soundproof case.

(Problems to be Solved by the Invention) According to the above configuration, in order to ventilate the inside of the soundproof case where hot air tends to be trapped due to the interior of the muffler with a single radiator fan, and to sufficiently cool the engine with the radiator, The radiator and radiator fan need to be large with a large heat dissipation capacity, and the ventilation openings need to be made larger to improve the ventilation performance of the soundproof case, making engine noise more likely to leak. Ta.

In addition, since the radiator fan continues to be driven while the engine is running, fan drive noise and cooling air exhaust noise are loud even when the engine is idling.

When a radiator fan is driven by a DC electric motor, motor consumable parts such as brushes must be replaced within a short period of time.

Cooling by the radiator fan begins at the same time as the engine starts, so there was a problem that it took a long time to warm up the engine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a soundproof water-cooled engine cooling device that can eliminate the problems found in the conventional devices.

(Means for Solving the Problems) The characteristic configuration of the present invention for achieving the above object is that the radiator fan 5 is driven by the electric motor 4 in the cooling device for the soundproof water-cooled engine described above, and A ventilation fan 18 driven by the engine output is provided at an intermediate height on one front side of the engine room A, and a muffler room C is provided in the vicinity of the ventilation fan 18. The muffler 11 is connected to the muffler chamber C.
A radiator cooling air inlet 24 is opened in the peripheral wall of the radiator chamber B, and an engine rotation speed detection sensor 33 is installed.
, an engine temperature detection sensor 34, and a motor control means that automatically stops the electric motor 24 for driving the radiator fan only when the detected engine speed is in a idling state and the detected engine temperature is below a set value. It has the following features.

(Function) According to the above configuration, the outside air sucked into the soundproof case from the ventilation inlet at the rear of the soundproof case is exposed to outside noise, becomes hot air, reaches the front of the engine compartment, and is guided to the muffler room by the ventilation fan. It is then released into the atmosphere.

Therefore, the ventilation fan performs ventilation cooling of the engine compartment and cooling of the muffler, and the radiator fan is responsible for cooling the radiator.

Also, during load operation when the engine speed is high and the engine temperature is high, the radiator fan is driven by the electric motor to perform the above cooling, but when the engine speed is reduced to a idling state and the engine temperature is When the electric motor becomes a no-load operation with a decrease in the electric motor, the electric motor is automatically stopped by the motor control means, and cooling operation is performed using only the ventilation fan.

(Example) Fig. 1 shows a vertical cross-sectional side view of a soundproof engine generator to which the soundproof water-cooled engine cooling device according to the present invention is applied, Fig. 2 shows its cross-sectional plane, and Fig. 3 shows the main part. The vertical front view of each is shown.

This engine generator basically has a water-cooled engine 2 installed between the front and rear inside a soundproof case 1, with the radiator 2a facing forward toward the cylinder, and a radiator 3 and an electric motor 4 installed in front of the engine 2. A driven radiator fan 5 is provided, and a power generator 8!6 that is belt-transmitted to the engine output shaft 2b is installed on the rear side of the engine 2.

A partition wall 7 is provided between the engine 2 and the radiator 3.
is installed upright, and inside the soundproof case 1 is the engine 2, the power generation t+
An oblong muffler room C is formed at the lower part of the front part of the engine room A and partitioned by a partition wall 9. A cylinder 7211 is housed therein and is connected to the cylinder head 2a via the exhaust pipe 10.

Further, an engine output shaft 2 is provided on one side of the cylinder head 2a.
A belt-transmitted autobump 12 is provided at b,
The suction port 12a of this water pump 12 is connected to the radiator 3.
The oak jacket 13b1 is connected to the lower tank 3a of the cylinder via a cold water pipe 14, and is connected to the water jacket 13a in the crankcase as shown in FIG. The outlet 12b is connected in communication. and,
A cooling water outlet 15 communicating with a water jacket 13a is provided on the upper surface of the crankcase of the engine 2, and the cooling water outlet 15 and the upper tank 3b of the radiator 3 are connected through a hot water pipe 16. In addition, as shown in FIG. 4, the casing 12c of the two-way pump 12
is equipped with a drain hook 28 that communicates with the lowermost part of the overjacket H3b of the cylinder head 2a, so that the cooling water in the overjackets 13a and 13b can be almost completely drained.

Further, a ventilation fan 18 is attached to the input pulley 17 of the two-auto pump 12, and the lower part of the air guide housing 19 surrounding the fan 18 and the upper part of one side end of the muffler chamber C are communicated through the ventilation port 20. , so that the hot air sucked in by the ventilation fan 18 from one side of the front part of the engine room A is sent into the muffler room C, cools the muffler 11, and then discharged to the outside through the exhaust port 21 formed at the bottom of the interior of the muffler room C. It is configured.

In addition, a ventilation inlet 22 is formed at the lower part of the rear wall of the soundproof case 1, and cold outside air is taken in from the rear of the engine compartment A. A ventilation port 23 is formed to communicate the front part of the engine room A and the radiator room B, and the ventilation port 23 is introduced through the ventilation inlet 22. Part of the ventilation that reached the front of room H is vent 23
It flows into the radiator chamber B through the radiator 3 together with cold outside air introduced from the cooling air inlet 24 formed in a part of the peripheral wall of the radiator chamber B, and is discharged to the outside from the exhaust port 25 on the front side wall of the soundproof case 1. It has become so.

Note that the reference numeral 26 in the figure is an intake pipe connected to an air cleaner (not shown), and the reference numeral 27 is a battery.

And in the 7rai wheel case 30 of engine 2,
A coil-type rotation detection sensor 33 is provided opposite the cell start ring gear 32 attached to the flywheel 31, and an engine temperature sensor 34 is provided on the cylinder head side of the upper surface of the crankcase to detect the crankcase wall temperature. , these two sensors 33 and 34 are connected to a comparison and discrimination circuit 35 as shown in FIG. It is controlled as follows.

In other words, a time chart of the control operation is shown in FIG. 6, and the engine rotation speed n detected by the rotation detection sensor 33 is equal to or lower than the rotation speed no during fitting, and the temperature sensor 34 detects the engine rotation speed n. Engine temperature θ is set value θ.

The electric motor 4 is configured to be stopped only when the following conditions are met, and to be driven when this condition is not met.

Note that the rotation detection sensor 33 may be one that detects the rotation speed of a rotation shaft other than the crankshaft, such as a camshaft.
Further, when the power generators 8 and 16 are connected to the engine 2 as in the embodiment, it is also possible to detect the engine rotation speed based on the power output voltage. In addition to directly detecting the temperature of the engine wall, the engine temperature sensor 34 may also detect the temperature of the cooling water in the water jacket 13a.

(Effects of the Invention) As explained above, according to the present invention, the following effects can be obtained.

(1) Although the muffler is housed inside the soundproof case and the overall external size is kept compact, the interior of the soundproof case is strongly ventilated by a radiator fan and a ventilation fan to suppress the accumulation of hot air. The ventilation opening provided in the soundproof case can be made smaller compared to the case where ventilation is performed only by ventilation, which reduces engine noise leakage from the ventilation opening and improves soundproofing performance.

(2) Since the radiator and radiator fan do not have to bear the burden of hot air in the engine room and exhaust heat from the muffler, their heat dissipation capacity is correspondingly small, which is advantageous for downsizing.

(3) When the engine speed is in a fitting state and the engine temperature is low, that is, when there is little heat generated from the engine and the load on the radiator is small, the electric motor for driving the radiator fan is automatically stopped. This makes it possible to reduce the radiator fan drive noise and exhaust air noise during idling.

(4) Since the operating time of the electric motor for driving the radiator fan is shortened compared to when the engine is operated, the period for replacing consumable parts of the electric motor is lengthened, and maintainability is improved.

(5) Since supercooling by the radiator fan is not performed when starting the engine when it is cold, the warm-up operation time can be shortened.

[Brief explanation of the drawing]

The drawings show an embodiment of the cooling device for a soundproof water-cooled engine according to the present invention, in which FIG. 1 is a longitudinal cross-sectional side view of a soundproof engine generator, FIG. 2 is a cross-sectional plan view thereof, and FIG. 4 is a side view of the automatic pump section, FIG. 5 is a block diagram of the electric motor control means, and FIG. 6 is a time chart. 1...Soundproof case, 2...Water-cooled engine, 2a.
・・Cylinder head, 3・Rashijita, 4・・
・Electric motor, 5...Radiator fan, 11.
...muffler, 14...cold water pipe, 16...hot water pipe,
18...-Ventilation fan, 22... Ventilation inlet, 24
...Radiator cooling air inlet, 25...Exhaust port, 3
3... Rotation speed sensor, 34... Temperature sensor, A
...Engine room, B...Radiator room, C...
・Muffler room. Figure 1 Figure 3

Claims (1)

[Claims] 1. Inside the soundproof case 1, a radiator 3 and a radiator fan 5 are arranged in front of the water-cooled engine 2, and the water jacket of the engine 2 and the radiator 3 are connected to the hot water pipe 16 and the cold water pipe 14. A ventilation inlet 22 is opened at the rear of the soundproof case 1, an exhaust port 25 is opened at the front, and the engine
In a soundproof water-cooled engine cooling system configured by housing a muffler 11 in a soundproof case 1, the radiator fan 5 is configured to be driven by an electric motor 4, and the radiator fan 5 is configured to be driven by an electric motor 4. A ventilation fan 18 driven by the engine output is provided in the rear part, a muffler room C is provided near the muffler room C, and the ventilation fan 18 is installed in the engine room A.
The muffler 11 is housed in the muffler chamber C, the radiator cooling air inlet 24 is opened in the peripheral wall of the radiator chamber B, and the engine rotation speed detection sensor 33 and the engine temperature are connected to each other. A detection sensor 34, and a motor control means that automatically stops the electric motor 4 for driving the radiator fan only when the detected engine speed is in a idling state and the detected engine temperature is below a set value. Soundproof water-cooled engine cooling system featuring