JP2556102Y2 - Dust blow-off device for dust proof net in engine cooling air intake device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust blow-off device for a dust-proof net in an engine cooling air intake device.

[0002]

2. Description of the Related Art Conventionally, as a device for taking in engine cooling air,
There is one disclosed in Japanese Utility Model Laid-Open No. 50-39633. As shown in FIG. 3, a cooling air intake 103 is provided in a bonnet 102 containing an engine 101, a dustproof net 104 is attached to the cooling air intake 103, and engine cooling air is sucked by an engine cooling fan 106. It is configured to be taken into the hood 102 from the dustproof net 104 by wind action.

According to the engine cooling air intake device,
The dust of the engine cooling wind is captured by the dustproof net 104, and it is possible to suppress the dust from entering the hood 102. However, if the amount of clogging of the dustproof net 104 by the captured dust exceeds an allowable limit, the engine cooling wind may cause shortage. The engine 101 may overheat.

[0004] Therefore, the intake device for the engine cooling air is provided with a dust blow-off device of a dust-proof net. This is configured by linking a dust blow-off fan 107 to a fan drive shaft 109 of the engine 101 via a manually operated clutch 108. According to the dust blow-off device, dust can be blown off from the dust-proof net 104 by the blowing operation of the dust blow-off fan 107 to eliminate the clogging. Therefore, the following problem occurs.

[0005]

In the above prior art,
The dust blow-off fan 107 is moved to the manually operated clutch 10
8, the dust blowing operation must be started manually by an operator. Therefore, in a dusty atmosphere in which the dustproof net 104 is clogged in a short time, it is necessary to frequently perform this manual operation, and the work load on the operator becomes large.

[0006] As in the above-described prior art, as long as the start of the dust blowing operation is performed by a manual operation of the operator, it is not possible to prevent the engine from overheating due to forgetting the operation of the operator.

[0007] The present invention is to make it possible to automate the start of dust blow-off work, and to attach dust to a dustproof net.
-Unnecessary blow-down while the accumulation amount does not reach the specified limit
Eliminate energy loss due to repelling and blow down
The air supply compressor can be reduced in size and output.
Is the task.

[0008]

According to the present invention, as shown in FIG. 1, a hood 2 containing an engine 1 is provided with a cooling air inlet 3, and a dustproof net 4 is attached to the cooling air inlet 3.
The engine cooling air intake device, which is configured to take in the engine cooling air 5 from the dustproof net 4 into the bonnet 2 by the air suction of the engine cooling fan 6, has the following features.

That is, a dust blow-off nozzle 7 is provided in the hood 2, the dust blow-off nozzle 7 is directed to the dust-proof net 4, and the dust blow-off nozzle 7 is communicated with a compressor 9 via a pressure accumulation tank 8. An air supply valve 10 is interposed between the dust blow-off nozzle 7 and the pressure accumulating tank 8, and the air supply valve 10 is operatively connected to a valve opening / closing drive device 11, and the valve opening / closing drive device 11 is connected to an engine temperature detecting device. 12 and the valve opening / closing drive device 1 based on the fact that the engine temperature detection device 12 detects that the engine temperature has risen to a predetermined temperature.
1 is configured to open the air supply valve 10;
It is characterized by the following.

[0010]

[Action] As shown in FIG. 1 to automatically perform blow off work dust, is interposed the air supply valve 10 between the dust blown off nozzle 7 and the accumulator tank 8, the air supply valve 10 a valve opening and closing device 11, the valve opening / closing drive device 11 is linked to an engine temperature detection device 12,
Since the valve opening / closing drive device 11 opens the air supply valve 10 based on the fact that the engine temperature detecting device 12 detects that the engine temperature has risen to the predetermined temperature, When the temperature reaches the temperature, the air supply valve 10 opens, the compressed air in the pressure accumulation tank 8 is supplied to the dust blow-off nozzle 7, and the dust blow-off work of the dust-proof net 4 is automatically started. For this reason, it is not necessary to manually start the dust blowing operation, and the work load on the worker is reduced.

The engine is turned off due to the operator forgetting to operate it.
When the prevent overheating and damage eliminating engine reaches a raised to a predetermined temperature, since the work blown down dust of the dust-proof net 4 is started automatically, there is no room for the engine 1 causes overheat by operating forget the operator. As long as the amount of deposits on the dust screen does not reach the limit,
Eliminates unnecessary loss of compressed air and energy loss
In addition, dust accumulates and accumulates on the dust-proof net 4, which extends the life of the compressor, and reaches the limit.
Then, the air intake amount of the engine cooling fan 6 abnormally decreases.
Thus, the engine temperature rises to a predetermined temperature. This
The valve is opened based on the detection by the engine temperature detector 12.
The air supply valve 10 is opened via the closing drive device 11.
Then, the compressed air stored in the pressure storage tank 8 blows dust.
It spouts vigorously from the drop nozzle 7 and adheres to the dustproof net 4.
Strongly blows off accumulated dust. This allows the engine
The air intake of the cooling fan 4 increases and the engine
-Prevent heat. Moreover, adhesion of dust on the dustproof net 4
・ As long as the accumulated amount does not reach the limit, the engine cooling fan
The air intake volume of fan 6 did not drop abnormally,
Temperature does not rise to the specified temperature. Because of this,
The air temperature detection device 12 does not open the air supply valve 10 and
The compressed air in the pressure tank 8 is spouted and wasted.
The energy loss caused by the unnecessary ejection of compressed air
Can be eliminated. At the same time, this compressed air
Operation of compressor 9 due to wasteful ejection
The service life of the compressor 9 can be extended
You. Accumulate the amount of short-term jet air over a long period of time
The compressor is required to blow down dust deposited and deposited on the dustproof net 4 which can be made small and small in power.
The time of compressed air ejection is determined by the
Compare with the blow-down pitch time until the drop-off operation
And much shorter. The amount of compression to be ejected during this short ejection time
Air blows down much longer than this
Compressor 9 is a unit
Use a small and small output with a small amount of discharge per hour
be able to.

[0012]

[Effect of the Invention] When the temperature of the engine which automatically performs the dust-blowing work reaches a predetermined temperature, the dust-blowing work of the dust-proof net is automatically started. The work load on the operator is reduced.

[0013] If the operator forgets to operate the engine,
When rid engine to prevent overheating and damage reaches the raised to a predetermined temperature, the dust blown off operation is automatically started, the engine is no room to cause overheating due to operation forget the operator. As long as the amount of deposits on the dust screen does not reach the limit,
Eliminates unnecessary loss of compressed air and energy loss
In addition, dust accumulates and accumulates on the dust-proof net 4, which extends the life of the compressor, and reaches the limit.
Then, the air intake amount of the engine cooling fan 6 abnormally decreases.
Thus, the engine temperature rises to a predetermined temperature. This
The valve is opened based on the detection by the engine temperature detector 12.
The air supply valve 10 is opened via the closing drive device 11.
Then, the compressed air stored in the pressure storage tank 8 blows dust.
It spouts vigorously from the drop nozzle 7 and adheres to the dustproof net 4.
Strongly blows off accumulated dust. This allows the engine
The air intake of the cooling fan 4 increases and the engine
-Prevent heat. Moreover, adhesion of dust on the dustproof net 4
・ As long as the accumulated amount does not reach the limit, the engine cooling fan
The air intake volume of fan 6 did not drop abnormally,
Temperature does not rise to the specified temperature. Because of this,
The air temperature detection device 12 does not open the air supply valve 10 and
The compressed air in the pressure tank 8 is spouted and wasted.
The energy loss caused by the unnecessary ejection of compressed air
Can be eliminated. At the same time, this compressed air
Operation of compressor 9 due to wasteful ejection
The service life of the compressor 9 can be extended
You. Accumulate the amount of short-term jet air over a long period of time
The compressor is required to blow down dust deposited and deposited on the dustproof net 4 which can be made small and small in power.
The time of compressed air ejection is determined by the
Compare with the blow-down pitch time until the drop-off operation
And much shorter. The amount of compression to be ejected during this short ejection time
Air blows down much longer than this
Compressor 9 is a unit
Use a small and small output with a small amount of discharge per hour
be able to.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional plan view of a bonnet portion of a combine according to an embodiment of the present invention, and FIG. 2 is a perspective view of an air injection device used in the embodiment of the present invention.

In FIG. 1, reference numeral 2 denotes a bonnet of a combine, in which a radiator 13 and an engine 1 are accommodated in front and rear.
An engine cooling fan 6 is mounted on the front side of the engine 1.

The bonnet 2 is provided with a device for taking in engine cooling air. That is, a cooling air inlet 3 is provided on the front wall of the hood 2, a dustproof net 4 is attached to the cooling air inlet 3, and the engine cooling air 5 is blown from the dustproof net 4 by an engine cooling fan 6. 2

In this engine cooling air intake device, the dust trapped by the engine cooling wind 5 causes the dustproof net 4 to be clogged, and the radiator core of the radiator 13 emits small dust that cannot be captured by the dustproof net 4. Cause clogging.

For this reason, the engine cooling air intake device is provided with a dust blow-off device, which is as follows. An air injection device 14 is arranged between the dustproof net 4 and the radiator 13. This air injection device 14
As shown in FIG. 2, a plurality of branch pipes 16 are branched laterally from a vertical main pipe 15, and a dust blow-off nozzle 7 for a dustproof net is provided in front of the branch pipe 16. A dust blow-off nozzle 7 for a radiator is provided on the rear side of the apparatus. As shown in FIG. 1, the main pipe 15 is connected to a compressor 9 via a pressure storage tank 8, and the compressor 9 is connected to an air cleaner 17.

According to the dust blow-off device, the air cleaned by the air cleaner 17 is stored in the pressure accumulating tank 8 by the compressor 9 as shown by an arrow in FIG. The dust is blown against the dustproof net 4 and the radiator 13, and the dust blow-off operation is performed.

In order to detect the proper start time of the dust blowing operation, the dust blowing device is provided with an engine temperature detecting device 12. This consists of a temperature sensor 19 arranged in the water jacket 18 of the engine 1,
It comprises a temperature comparator 20 connected to the water temperature sensor 19. A predetermined set temperature is stored in the temperature comparator 20. This set temperature is an expected temperature of the cooling water immediately before the engine 1 overheats. The temperature comparator 20 compares the set temperature stored in the memory with the cooling water temperature actually measured by the temperature sensor 19, and can detect coincidence between the two.

For this reason, it is possible to detect that the engine is immediately before overheating by measuring the cooling water temperature, and thereby it is possible to detect that the appropriate time to start the dust blowing operation has come.

In order to automatically start the dust blow-off operation, the dust blow-off device has been devised as follows. Dust blow-off nozzle 7 and accumulator tank 8
, An air supply valve 10 is interposed. The air supply valve 10 is linked to an electromagnetic valve opening / closing drive device 11. The valve opening / closing drive device 11 opens the air supply valve 10 when energized, and maintains the air supply valve 10 in a closed state when not energized. This valve opening / closing drive 1
1 is connected to a battery 22 via a switch 21. The switch 21 is linked to the energization command device 23. The energization command device 23 sets the switch 21 to 0 based on the fact that the engine temperature detection device 12 detects that the cooling water temperature of the engine 1 has reached a predetermined set temperature.
N.

[0022] Therefore, when the engine temperature reaches rises to a predetermined set temperature, energization command device 23 switch 21
Is turned on, power is supplied from the battery 22 to the valve opening / closing drive device 11, the valve opening / closing drive device 11 opens the air supply valve 10, and the compressed air in the accumulator tank 8 is supplied to the dust blow-off nozzle 7, The drop operation will be started automatically.

In order to automatically end the blow-down operation, a timer 24 is connected to the energizing command device 23, and after a predetermined time has elapsed from the start of the command of the energizing command device 23, the energizing command of the energizing command device 23 is stopped. Switch 21 off
F.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

For example, in the above embodiment, the temperature sensor 19
Is disposed in the water jacket 18 of the engine 1, and the temperature sensor 19 is connected to the exhaust outlet 2 of the radiator 13.
5 to measure the radiator exhaust air temperature. The temperature sensor 19 may be brought into contact with the wall of the engine 1 to measure the temperature of the wall of the engine 1. Further, the temperature sensor 19 may be arranged in contact with the hood 2 to measure the temperature of the hood 2. This is because in any of these arrangements, the engine temperature can be measured directly and indirectly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a bonnet portion of a combine according to an embodiment of the present invention.

FIG. 2 is a perspective view of an air injection device used in the embodiment of the present invention.

FIG. 3 is a cross-sectional plan view of the prior art.

[Explanation of symbols]

1 ... Engine, 2 ... Bonnet, 3 ... Cooling air intake, 4
... Dustproof net, 5 ... Engine cooling air, 6 ... Engine cooling fan, 7 ... Dust blow-off nozzle, 8 ... Pressure accumulation tank, 9 ...
Compressor, 10: air supply valve, 11: valve opening / closing drive device, 12: engine temperature detection device.

Claims (1)

(57) [Scope of request for utility model registration] 1. A hood (2) containing an engine (1).
A cooling air intake (3) is provided in the cooling air intake (3), a dustproof net (4) is attached to the cooling air intake (3), and the engine cooling air (5) is sucked by an engine cooling fan (6) to make the above dustproof net. Bonnet from (4)
An engine cooling air intake device configured to be introduced into (2), wherein a dust blow-off nozzle (7) is provided in the bonnet (2), and the dust blow-off nozzle (7) is connected to the dust net ( Toward 4), this dust blow-off nozzle (7) is inserted into the pressure accumulation tank (8).
The air supply valve (10) is interposed between the dust blow-off nozzle (7) and the pressure accumulation tank (8) through the air supply valve (10).
Is linked to a valve opening / closing drive (11), and this valve opening / closing drive (11) is linked to an engine temperature detecting device (12),
Based on the fact that the engine temperature detecting device (12) has detected that the engine temperature has risen to a predetermined temperature, the valve opening / closing drive device (11) controls the air supply valve (10).
A dust blow-off device for a dust-proof net in an engine cooling air intake device, wherein the device is configured to open a valve.