JPS606593Y2 - Protection device for engine-driven power machinery - Google Patents

Description

[Detailed description of the invention] The present invention relates to a protection device for an engine-driven power machine.
In particular, the present invention relates to a protection device for an engine-driven power machine that automatically replenishes engine lubricating oil and prevents damage to the engine due to overflow of engine lubricating oil after this replenishment is interrupted.

In general, engine-driven power machines that use the engine as a power source to drive generators, contactors, compressors, etc. are often operated unmanned and continuously for long periods of time, which consumes a considerable amount of engine lubricating oil. reach.

For example, if the engine is operated continuously using only the lubricating oil in the engine without externally replenishing the lubricating oil, the normal limit is about 20 to 3 rotations, and no more than 20 to 3 rotations. If the engine is operated under such conditions, there is a problem that the engine may seize due to lack of engine lubricating oil.

The present invention was developed in view of the above, and is capable of automatically replenishing engine lubricating oil, and preventing damage to the engine due to lack of engine lubricating oil after this supply is interrupted. The purpose is to provide a protection device for an engine-driven power machine that can operate continuously for a long period of time, and detects the amount of lubricating oil at at least two oil level positions in the engine lubricating oil reservoir. At the same time, the above object is distantly related to the above object by a protection device for an engine-driven power machine having a lubricating oil supply control device that automatically replenishes lubricating oil based on these detection results and a control device that drives an engine stop device. That is.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is an explanatory diagram showing the entire system of a protection device for an engine-driven power machine according to the present invention.

In this diagram, the lubricating oil reservoir (not shown) of the engine (not shown) is shown.
(hereinafter referred to as 1 oil panyo) 6 includes an oil pipe 5A,
A lubricating oil storage tank (hereinafter referred to as 1 oil tank YO) 4 is connected via 5B and a later-described lubricating oil supply control device (hereinafter referred to as 1 supply control device YO) 3, thereby making it possible to replenish lubricating oil. It is now possible to do so.

Inside the oil pan 6, there is a lubricating oil amount detecting device (hereinafter referred to as “detecting device 1”) 2 that sends information regarding the position of the lubricating oil level to a control unit 1, which will be described later, and a lubricating oil amount detecting device 2 for supplying lubricating oil to various parts of the engine. A pipe 7 is provided as shown in the figure, and the pipe 7 is provided with a pipe 7A for supplying the aforementioned lubricating oil.

Further, the engine is provided with a stop device 8 for stopping the engine by pulling a fuel supply stop lever using a solenoid, a motor, etc., and is configured to be operated by being biased by the control section 1 described above. There is.

The control unit 1 is also equipped with an alarm lamp 9 and an alarm buzzer 10 that operate when all the lubricating oil in the oil tank 4 is replenished into the oil pan 6.

To briefly describe the overall operation of the protection device having the above configuration, first, as the engine is operated, the lubricating oil in the oil pan 6 is consumed and the oil level decreases.

This decrease in the oil level is detected by the detection device 2,
The information is transmitted to the control section 1.

energized by this, the control section 1 drives the supply control device 3 described above, whereby lubricating oil is replenished from the oil tank 4 into the oil pan 6, and the engine continues to operate smoothly.

As the above operations are repeated, all of the lubricating oil in the oil tank 4 is consumed, and as a result, the lubricating oil level in the oil pan 6 begins to drop.

This state is detected by the detection device 2 and transmitted to the control section 1, and as described above, the alarm lamp 9 lights up and the alarm buzzer 10 starts sounding.

If the engine continues to operate from this state, the oil level in the oil pan 6 will further drop, eventually causing trouble in the operation of the engine.

The oil level position at this time is detected by the detection device 2 and transmitted to the control section 1.

As a result, the control unit 1 energizes the above-mentioned stop device 8, and the operation of the engine is stopped, thereby avoiding damage such as seizure.

Next, the detailed configuration and operation of each part of the protection device that operates as described above will be explained.

FIG. 2 shows a specific configuration of the detection device 2 described above.

In this figure, the detection device 2 is configured by fitting cylindrical floats 21A and 21B, which move up and down in response to the up-and-down movement of the lubricating oil level, into a hollow cylindrical column 25 as shown in the figure. It has a combined configuration.

Among these floats 2IA and 21B, float 21
Float A is configured such that the above-mentioned vertical movement is restricted by stoppers 23A and 23B provided at the upper end and middle portion of the support column 25, respectively, and other floats 21B
is configured such that the above-mentioned vertical movement is restricted by the stopper 23B and a stopper 23C provided at the lower end of the support column 25.

Permanent magnets 24A and 24B are respectively installed on the inner circumferential side of the upper end of these flows 21A and 21B, so that they can drive reed switches 22A and 22B, which will be described later, respectively.

Inside the pillar 25 is a reed switch 22A.

22B are respectively installed at predetermined positions, and the permanent magnets 24A and 24B perform 'ON-yo' and '0FFJ' operations by the vertical movement of the floats 21A and 21B mentioned above.

Further, both terminals of these reed switches 22A and 22B are led out to the outside as shown in the figure, and are connected to the control 1 described above.

As shown in FIG. 1, the detection device 2 having the above configuration is installed upright at the bottom of the oil pan 6 by a screw mechanism 27 via a packing 26 for preventing leakage of lubricating oil.

Next, the operation of the above-mentioned detection device 2 in response to a change in the oil level position will be explained.

In FIG. 2, first, if the oil level position in the oil pan 6 is <Lt as shown in the figure, then the floats 21A, 2
1B both try to move upward due to buoyancy, but are stopped at a predetermined position by stoppers 23A and 23B.

In this state, the reed switches 22A and 22B described above are not affected by the permanent magnets 24A and 24B and are
The state becomes FFJ.

Next, when the oil level drops and reaches L2, float 2
Of IA and 21B, only float 21A moves downward.

Therefore, the reed switch 22A is connected to the permanent magnet 2.
Under the influence of a 4A magnetic field, the state changes from the OFF state to the ON state.

The 'ONJ' state of the reed switch 22A is maintained as it is because the float 21A is stopped by the stopper 23B when the oil level is below the above level.

In other words, if the oil level position is above L2, the reed switch 22A becomes rOFFJ, and conversely, when the oil level position is below the above mentioned value, the reed switch 22A becomes 'ONJ'.

Furthermore, the consumption of lubricating oil progresses and the oil level drops, as shown in the figure.
When it comes to L4, this time, float 21 in the same way as above.
By the permanent magnet 24B of B, other reed switch 22B
changes from OFF to 'ONJ'.

Similarly, when the oil level is above or below the ON state of the reed switch 22B, the float 21B is stopped by the stopper 23C, so that it is maintained as it is.

In other words, if the oil level position is above L4, the reed switch 22B is turned OFF, and conversely, if the oil level is below the original oil level, the reed switch 22B is turned ON.

To summarize the operations of the reed switches 22A and 22B, when the oil level is above the above range, both switches are in the OFF position, and when the oil level is below the above range and above the above range, only the reed switch 22A is in the OFF position. Therefore, when the oil level position is below L4, both of them become 'ON'.

Next, a specific configuration example of the above-mentioned supply control device 3 will be explained in the third section.
As shown in the figure.

In this figure, the supply control device 3 has an upstream pipe 34 connected to the oil tank 4 described above and a downstream pipe 35 connected to the oil pan 6, and there is a pipe in between. A valve 31 that is opened and closed by a valve 32 is provided.

A solenoid 33, which is in contact with the control section 1, is fitted into the plunger section 32A of the valve 32, so that the valve 31 is opened and closed, and a spring 32B causes the valve 31 to be moved downwardly. Stroke so that pressing force is applied.

To explain in detail, first, when the solenoid 33 is not energized, the valve 32 is kept in the one-closed state by the pressing force of the spring 32B.

Therefore, no lubricating oil is supplied from the oil tank 4 to the oil pan 6 (see FIG. 1).

Next, when the solenoid 33 is energized by the control unit 1,
The plunger portion 32A of the valve 32 is sucked into the solenoid 33.

Therefore, the valve 32 is also pulled up, and the valve 31 changes from the 1st closed state to the 1st open state.

Therefore, lubricating oil is supplied from the oil tank 4 to the oil pan 6.

(See Figure 1).

To summarize the operation of the supply control device 3 described above, the lubricating oil is supplied from the oil tank 4 to the oil pan 6 only when electricity is supplied from the control section 1.

Furthermore, the stop device 8 pulls the fuel supply stop lever using a solenoid, motor, etc. as described above,
This configuration allows the engine to be stopped.

Next, FIG. 4 shows the electrical components of the above-mentioned parts and the specific structure of the above-mentioned control section 1 (see FIG. 1).

In this figure, the control unit 1 includes a replenishment control unit IA that controls the supply control device 3 described above to automatically replenish lubricating oil.
The stop control section IB controls the above-mentioned stop device 8 to stop the operation of the engine.

Among these, the replenishment control unit IA is the relay device 41
and timer devices 43 and 44, which control the supply control device 3 (see FIGS. 1 and 3), the alarm lamp 9, and the alarm buzzer 10 (see FIG. 1). I'm stroking it like that.

On the other hand, the stop control section 1B includes a relay device 42, a timer device 45, and a reset switch 49, and the stop device 8 is controlled by these.

Next, specific connections of the above-mentioned parts will be explained.

First, to explain from the replenishment control unit IA, the relay device 41 includes a relay coil 41A and two normally open contacts 41.
B, 41C.

Next, the timer device 43 is connected to the timer 43A and the normally closed contact 43B, and the other timer 44 is connected to the timer 43A and the normally closed contact 43B.
4A normally closed contact 44B.

Among these, the relay coil 41A has one end turned from 'OFF J' to 'ON' when the engine is started.
It is connected to the positive side of a power source 48 via a start switch 47 that is in the J state.

On the other hand, the other end of the relay coil 41A is connected to the negative side of the power source 48 via the reed switch 22A.

Both ends of the reed switch 22A are connected to the normally open contact 41.
B and a normally closed contact 43B.

Next, the other normally open contact 41C of the relay device 41 has one end connected to the positive side of the power source 48 via the start switch 47, and the other end connected to the positive side of the power source 48 via the timer 43A.
Each is connected to the negative side of 8.

The above-described supply control device 3 (see FIGS. 1 and 3) and the timer 44A are each connected in parallel to the timer 43A.

The normally open contact 44B constituting the timer 44A and the timer device 44 has one end connected to the positive side of the power source 48 via the start switch 47, and the other end connected to the above-mentioned alarm lamp 9 and alarm buzzer 10. and are respectively connected to the negative side of the power source 48.

Next, to explain the stop control section IB, first,
Relay coil 42A that constitutes the relay device 42 described above
One end is connected to the positive side of the power source 48 via the start switch 47, and the other end is connected to the negative side of the power source 48 via the reset switch 49 and the reed switch 22B.

Further, the normally open contacts 42B of the relay device 42 described above are connected to both ends of the reed switch 22B.

Next, the other normally open contact 42C of the relay device 42 mentioned above is
One end thereof is connected to the positive side of the power source 48 via the start switch 47, and the other end is connected to the negative side of the power source 48 via the timer 45A of the timer device 45, respectively.

Further, the timer 45A, the normally closed contact 45B constituting the timer device 45, and the aforementioned stop device 8 are connected in parallel to the timer 45A.

Next, the overall operation of the above embodiment will be explained.

First, with the start of the engine, the aforementioned start switch 47 changes from '0FFJ' to 'ON'.
A voltage is applied from the power supply 48 to each of the above-mentioned parts to put them into an operating state.

Next, when the lubricating oil in the oil pan 6 is consumed as the engine is operated, the reed switch 22A of the detection device 2 (see FIGS. 1 and 2) is activated as described above.
From OFF to 'ON J'.

Therefore, a voltage is applied to the relay coil 41A from the power supply 48, and the normally open contacts 41B and 41C are set to 'O'.
From FF, it becomes 'ON'.

As a result, the relay coil 41A is connected to the power source 48 via the normally open contact 41B and the normally closed contact 43B, so that it enters a so-called self-maintained state.

Therefore, since voltage is applied from the power supply 48 to the above-mentioned timer 43A, the timer 43A operates for a predetermined period of time (
Below 'T1. ) starts counting.

At the same time, a voltage is applied to the supply control device 3 described above through the normally open contact 41C, and the lubricating oil is supplied to the oil tank 4.
The oil will be replenished into the oil pan 6 from (Fig. 1,
(See Figure 3).

Next, after T□, the timer 43A finishes counting, and the normally closed contact 43B changes from rON to OFF.

As mentioned above, since lubricating oil is being replenished during the previous H1, the reed switch 22A is again turned from rONJ to r.
It is changing to an OFF state.

Therefore, the relay device 41 is released from its self-holding state, and the normally open contacts 41B and 41C are turned OFF from 'ONJ' again.
It becomes J.

As a result, the supply control device 3 of the timer 43A1 is no longer energized, the timer 43A is reset, and the normally closed contact 43B is returned from the OFF state to the ONJ state.

Note that while the timer 43A is operating, other timers 44A operate for a predetermined period of time (hereinafter referred to as 1T2).
Since the timer (referred to as J) is set longer than T4, the normally open contact 44B is reset in the same way as the timer 43A without operating.

Further, during the above operation, the reed switch 22B of the detection device 2 does not operate, so the stop control section 2B does not operate at all.

Next, when the above operations are repeated and automatic replenishment of lubricating oil continues, the lubricating oil in the oil tank 4 will be completely consumed.

In this state, when the reed switch 22A of the detection device 2 changes from 'OFF' to 'ONJ', the relay coil 41A is energized and the normally open contacts 41B,
41C all change from OFF to 'ONJ'.

As a result, the supply control device 3 is energized and attempts to replenish lubricating oil from the oil tank 4 into the oil pan 6, but this is not possible, so even after the timer 43A has finished operating, the reed switch 22A remains in the 'ONJ' position. The situation will be maintained.

Therefore, even if the normally closed contact 43B is turned off, the relay device 41 continues to be energized.

Therefore, the normally open contact 41C remains in the rONJ state, the timer 43A is not reset, and the normally closed contact 43B remains in the "OFF" state.

On the other hand, the timer 44A is energized even after the T□ ends, so it counts up to the T2, and after the T2, the normally open contact 44B changes from '0FFJ to rONJ.

Therefore, a voltage is applied from the power supply 48 to the above-mentioned alarm lamp 9 and alarm buzzer 10 to notify that the oil pan 6 is no longer supplied with lubricating oil from the outside.

Next, if you continue to operate the engine in the above condition without replenishing any lubricating oil, the oil pan 6
As the lubricating oil inside is further consumed, the reed switch 22B also changes from "OFF" to "ON" as shown in FIG.

As a result, the relay coil 42A is energized from the power source 48, and the normally open contacts 42B and 42C change from OFF J to ONJ.

Among these, the relay device 42 is self-held by the operation of the normally open contact 42B, and the timer 45A starts counting a predetermined time (hereinafter referred to as 1T3J) by the operation of the normally open contact 42C.

At the same time, the stop device 8 is activated by the power source 48 via the normally closed contact 45B of the timer 45A.

As a result, as described above, the fuel supply stop lever provided on the engine is pulled by the operation of the solenoid or the like of the stop device 8, and the operation of the engine is stopped.

Generally, it usually takes 10 to 2 hours for an engine to completely stop rotating from a high-speed rotation state.

Therefore, the T3 which is the set time of the timer 45A
By setting the value to about 3, it is possible to prevent unnecessary power consumption after the engine is stopped.

Specifically, the normally closed contact 45B is connected to the timer 45.
After A counts T3, 'O' is sent from rONJ.
Becomes FF J.

In other words, the energization to the stopping device 8 is performed at three times as described above.
Since the engine will stop running after about 30 minutes, no power will be wasted after the engine is stopped.

The reset switch 49 is used to release the self-holding state of the relay device 42 when the engine is refilled with lubricating oil and controlled again after the engine is stopped.

Finally, a case in which lubricating oil is immediately replenished into the oil tank 4 when all the lubricating oil in the oil tank 4 is consumed and the alarm lamp 9 and alarm buzzer 10 are activated as described above will be described.

As mentioned above, in the above state, the relay device 41 maintains the energized state, so that the normally open contact 4
1B, 41C, 44B are 'ONJ', normally closed contact 43B is r
``0FFJ10FFJ1 reed switch 22A remains.

Further, the timers 43A and 44A each have the T□
, T2 is in the state before being reset after the end of counting.

Further, the supply control device 3 remains energized, and the valve 31 (FIG. 3) remains open.

Here, when the oil tank 4 is replenished with lubricating oil, the lubricating oil is replenished into the oil pan 6 via the supply control device 3.

With this replenishment, the reed switch 22A changes from 'ONJ' to '0FFJ'.

Therefore, the relay device 41 is released from the energized state, and the normally open contacts 41B and 41C are turned from 1ONJ to rOFF.
It becomes J.

This resets the timers 43A and 44A,
The normally closed contact 43B changes from OFF to ``ON,'' and the normally open contact 44B changes from 1ON to ``0FFJ,'' and returns to the initial state.

Although the control circuit shown in FIG. 4 is constructed using a relay device, a timer device, etc., the present invention is not limited to this in any way, and may be implemented using general transistors, ICs, etc.
It may also be configured using, etc.

Furthermore, any detection device, supply control device, etc. described above may be used as long as they have similar functions.

As described above, according to the present invention, it is possible to automatically replenish lubricating oil consumed by engine operation in a good manner, and to automatically stop engine operation after this replenishment is interrupted. This makes it possible to prevent engine damage due to lack of lubricating oil.
Furthermore, it is possible to provide a protection device for an engine-driven power machine that can be operated continuously for a long period of time.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the system of the protection device for an engine-driven power machine according to the present invention, Fig. 2 is a partial sectional view showing a detailed configuration example of the detection device, and Fig. 3 is a configuration example of the supply control device. FIG. 4 is an explanatory diagram showing an example of the configuration of the electrical components in FIG. 1. 1...Control unit as a control device, 2...
・Lubricating oil amount detection device, 3... Lubricating oil supply control device, 4... Lubricating oil storage tank 6... Lubricating oil reservoir, bottom... Engine stop device .

Claims (1)

[Scope of utility model registration request] A first detection device for detecting the amount of lubricating oil at a first oil level position in the engine lubricating oil reservoir;
a second detection device that detects at a second oil level position that is set lower than the oil level position of the lubricating oil supply control device that operates based on the detection result of the first detection device. , a control device in which the engine is equipped with an engine stop device that is interposed between the lubricating oil reservoir and the lubricating oil storage tank and operates based on the detection result of the second detection device; and a control device that controls the above operations. A protection device for an engine-driven power machine, characterized by having the following.